// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include "../../../shared/highdpi.h"

#include <qboxlayout.h>
#include <qapplication.h>
#include <qbitmap.h>
#include <qdebug.h>
#include <qeventloop.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qlineedit.h>
#include <qlistview.h>
#include <qmessagebox.h>
#include <qmimedata.h>
#include <qpainter.h>
#include <qpoint.h>
#include <qpushbutton.h>
#include <qstyle.h>
#include <qwidget.h>
#include <qstylefactory.h>
#include <private/qwidget_p.h>
#include <private/qwidgetrepaintmanager_p.h>
#include <private/qapplication_p.h>
#include <private/qhighdpiscaling_p.h>
#include <qcalendarwidget.h>
#include <qmainwindow.h>
#include <qdockwidget.h>
#include <qrandom.h>
#include <qsignalspy.h>
#include <qstylehints.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include <QtCore/qoperatingsystemversion.h>
#include <QtGui/qpaintengine.h>
#include <QtGui/qpainterpath.h>
#include <QtGui/qbackingstore.h>
#include <QtGui/qguiapplication.h>
#include <QtGui/qpa/qplatformwindow.h>
#include <QtGui/qpa/qplatformdrag.h>
#include <QtGui/qscreen.h>
#include <qmenubar.h>
#include <qcompleter.h>
#include <qtableview.h>
#include <qtreewidget.h>
#include <qabstractnativeeventfilter.h>
#include <qproxystyle.h>
#include <QtWidgets/QGraphicsView>
#include <QtWidgets/QGraphicsProxyWidget>
#include <QtGui/qwindow.h>
#include <qtimer.h>
#include <QtWidgets/QDoubleSpinBox>
#include <QtWidgets/QComboBox>

#include <QtTest/QTest>
#include <QtTest/private/qtesthelpers_p.h>

using namespace QTestPrivate;
using namespace Qt::StringLiterals;

#if defined(Q_OS_WIN)
#  include <QtCore/qt_windows.h>
#  include <QtGui/private/qguiapplication_p.h>
#include <qpa/qplatformnativeinterface.h>
#include <qpa/qplatformintegration.h>

#include <algorithm>

static HWND winHandleOf(const QWidget *w)
{
    static QPlatformNativeInterface *nativeInterface
            = QGuiApplicationPrivate::platformIntegration()->nativeInterface();
    if (void *handle = nativeInterface->nativeResourceForWindow("handle", w->window()->windowHandle()))
        return reinterpret_cast<HWND>(handle);
    qWarning() << "Cannot obtain native handle for " << w;
    return nullptr;
}

#  define Q_CHECK_PAINTEVENTS \
    if (::SwitchDesktop(::GetThreadDesktop(::GetCurrentThreadId())) == 0) \
        QSKIP("desktop is not visible, this test would fail");

#else // Q_OS_WIN
#  define Q_CHECK_PAINTEVENTS
#endif

#ifdef Q_OS_MACOS
#include <Security/AuthSession.h>
bool macHasAccessToWindowsServer()
{
    SecuritySessionId mySession;
    SessionAttributeBits sessionInfo;
    SessionGetInfo(callerSecuritySession, &mySession, &sessionInfo);
    return (sessionInfo & sessionHasGraphicAccess);
}
#endif

#if defined(Q_OS_WIN)
static inline void setWindowsAnimationsEnabled(bool enabled)
{
    ANIMATIONINFO animation = { sizeof(ANIMATIONINFO), enabled };
    SystemParametersInfo(SPI_SETANIMATION, 0, &animation, 0);
}

static inline bool windowsAnimationsEnabled()
{
    ANIMATIONINFO animation = { sizeof(ANIMATIONINFO), 0 };
    SystemParametersInfo(SPI_GETANIMATION, 0, &animation, 0);
    return animation.iMinAnimate;
}
#else // Q_OS_WIN
inline void setWindowsAnimationsEnabled(bool) {}
static inline bool windowsAnimationsEnabled() { return false; }
#endif // !Q_OS_WIN

template <class T>
static QByteArray msgComparisonFailed(T v1, const char *op, T v2)
{
    QString s;
    QDebug(&s) << v1 << op << v2;
    return s.toLocal8Bit();
}

template<class T> class EventSpy : public QObject
{
public:
    EventSpy(T *widget, QEvent::Type event)
        : m_widget(widget), eventToSpy(event)
    {
        if (m_widget)
            m_widget->installEventFilter(this);
    }

    T *widget() const { return m_widget; }
    int count() const { return m_count; }
    void clear() { m_count = 0; }

protected:
    bool eventFilter(QObject *object, QEvent *event) override
    {
        if (event->type() == eventToSpy)
            ++m_count;
        return  QObject::eventFilter(object, event);
    }

private:
    T *m_widget;
    const QEvent::Type eventToSpy;
    int m_count = 0;
};

Q_LOGGING_CATEGORY(lcTests, "qt.widgets.tests")

class tst_QWidget : public QObject
{
    Q_OBJECT

public:
    tst_QWidget();
    virtual ~tst_QWidget();

public slots:
    void initTestCase();
    void cleanup();

private slots:
    void nativeWindowAttribute();
    void addActionOverloads();
    void getSetCheck();
    void fontPropagation();
    void fontPropagation2();
    void fontPropagation3();
    void fontPropagationDynamic();
    void palettePropagation();
    void palettePropagation2();
    void palettePropagationDynamic();
    void enabledPropagation();
    void ignoreKeyEventsWhenDisabled_QTBUG27417();
    void properTabHandlingWhenDisabled_QTBUG27417();
#if QT_CONFIG(draganddrop)
    void acceptDropsPropagation();
#endif
    void isEnabledTo();
    void visible();
    void visible_setWindowOpacity();
    void isVisibleTo();
    void isHidden();
    void fonts();
    void mapFromAndTo_data();
    void mapFromAndTo();
    void focusChainOnHide();
    void focusChainOnReparent();
    void defaultTabOrder();
    void reverseTabOrder();
    void tabOrderWithProxy();
    void tabOrderWithProxyDisabled();
    void tabOrderWithProxyOutOfOrder();
    void tabOrderWithCompoundWidgets();
    void tabOrderWithCompoundWidgetsInflection_data();
    void tabOrderWithCompoundWidgetsInflection();
    void tabOrderWithCompoundWidgetsNoFocusPolicy();
    void tabOrderNoChange();
    void tabOrderNoChange2();
    void appFocusWidgetWithFocusProxyLater();
    void appFocusWidgetWhenLosingFocusProxy();
    void explicitTabOrderWithComplexWidget();
    void explicitTabOrderWithSpinBox_QTBUG81097();
    void tabOrderList();
    void tabOrderComboBox_data();
    void tabOrderComboBox();
#if defined(Q_OS_WIN)
    void activation();
#endif
    void reparent();
    void setScreen();
    void windowState();
    void resizePropagation();
    void showMaximized();
    void showFullScreen();
    void showMinimized();
    void showMinimizedKeepsFocus();
    void icon();
    void hideWhenFocusWidgetIsChild();
    void normalGeometry();
    void setGeometry();
    void setGeometryHidden();
    void windowOpacity();
    void raise();
    void lower();
    void stackUnder();
    void testContentsPropagation();
    void saveRestoreGeometry();
    void restoreVersion1Geometry_data();
    void restoreVersion1Geometry();
    void restoreGeometryAfterScreenChange_data();
    void restoreGeometryAfterScreenChange();

    void widgetAt();
#ifdef Q_OS_MACOS
    void setMask();
#endif
    void optimizedResizeMove();
    void optimizedResize_topLevel();
    void resizeEvent();
    void task110173();

    void testDeletionInEventHandlers();

    void childDeletesItsSibling();

    void setMinimumSize();
    void setMaximumSize();
    void setFixedSize();

    void ensureCreated();
    void createAndDestroy();
    void eventsAndAttributesOnDestroy();
    void winIdChangeEvent();
    void persistentWinId();
    void showNativeChild();
    void closeAndShowNativeChild();
    void closeAndShowWithNativeChild();
    void transientParent();
    void qobject_castOnDestruction();

    void showHideEvent_data();
    void showHideEvent();
    void showHideEventWhileMinimize();
    void showHideChildrenWhileMinimize_QTBUG50589();

    void lostUpdatesOnHide();

    void update();
    void isOpaque();

#ifndef Q_OS_MACOS
    void scroll();
    void scrollNativeChildren();
#endif

    // tests QWidget::setGeometry()
    void setWindowGeometry_data();
    void setWindowGeometry();

    // tests QWidget::move() and resize()
    void windowMoveResize_data();
    void windowMoveResize();

    void moveChild_data();
    void moveChild();
    void showAndMoveChild();

    void subtractOpaqueSiblings();

#if defined (Q_OS_WIN)
    void setGeometry_win();
#endif

    void setLocale();
    void propagateLocale();
    void deleteStyle();
    void multipleToplevelFocusCheck();
    void setFocus();
#ifndef QT_NO_CURSOR
    void setCursor();
#endif
    void setToolTip();
    void testWindowIconChangeEventPropagation();

    void minAndMaxSizeWithX11BypassWindowManagerHint();
    void showHideShowX11();
    void clean_qt_x11_enforce_cursor();

    void childEvents();
    void render();
    void renderChildFillsBackground();
    void renderTargetOffset();
    void renderInvisible();
    void renderWithPainter();
    void renderRTL();
    void render_task188133();
    void render_task211796();
    void render_task217815();
    void render_windowOpacity();
    void render_systemClip();
    void render_systemClip2_data();
    void render_systemClip2();
    void render_systemClip3_data();
    void render_systemClip3();
    void render_task252837();
    void render_worldTransform();

    void setContentsMargins();

    void moveWindowInShowEvent_data();
    void moveWindowInShowEvent();

    void repaintWhenChildDeleted();
    void hideOpaqueChildWhileHidden();
    void updateWhileMinimized();
    void alienWidgets();
    void nativeWindowPosition_data();
    void nativeWindowPosition();
    void adjustSize();
    void adjustSize_data();
    void updateGeometry();
    void updateGeometry_data();
    void sendUpdateRequestImmediately();
    void doubleRepaint();
    void resizeInPaintEvent();
    void opaqueChildren();

    void dumpObjectTree();

    void setMaskInResizeEvent();
    void moveInResizeEvent();

#ifdef QT_BUILD_INTERNAL
    void immediateRepaintAfterInvalidateBackingStore();
#endif

    void effectiveWinId();
    void effectiveWinId2();
    void customDpi();
    void customDpiProperty();

    void quitOnCloseAttribute();
    void moveRect();

#if defined (Q_OS_WIN)
    void gdiPainting();
    void paintOnScreenPossible();
#endif
    void reparentStaticWidget();
    void QTBUG6883_reparentStaticWidget2();

    void translucentWidget();

    void setClearAndResizeMask();
    void maskedUpdate();
#ifndef QT_NO_CURSOR
    void syntheticEnterLeave();
    void enterLeaveOnWindowShowHide_data();
    void enterLeaveOnWindowShowHide();
    void taskQTBUG_4055_sendSyntheticEnterLeave();
    void hoverPosition();
    void underMouse();
    void taskQTBUG_27643_enterEvents();
#endif
    void windowFlags();
    void initialPosForDontShowOnScreenWidgets();
    void updateOnDestroyedSignal();
    void toplevelLineEditFocus();

    void focusWidget_task254563();
    void rectOutsideCoordinatesLimit_task144779();
    void setGraphicsEffect();
    void render_graphicsEffect_data();
    void render_graphicsEffect();

#ifdef QT_BUILD_INTERNAL
    void destroyBackingStore();
#endif

    void activateWindow();

    void openModal_taskQTBUG_5804();

    void focusProxy();
    void imEnabledNotImplemented();

#ifdef QT_BUILD_INTERNAL
    void scrollWithoutBackingStore();
#endif

    void taskQTBUG_7532_tabOrderWithFocusProxy();
    void movedAndResizedAttributes();
    void childAt();
#ifdef Q_OS_MACOS
    void taskQTBUG_11373();
#endif
    void taskQTBUG_17333_ResizeInfiniteRecursion();

    void nativeChildFocus();
    void grab();
    void grabMouse();
    void grabKeyboard();

    void touchEventSynthesizedMouseEvent();
    void touchUpdateOnNewTouch();
    void touchCancel();
    void touchEventsForGesturePendingWidgets();

    void styleSheetPropagation();

    void destroyedSignal();

    void keyboardModifiers();
    void mouseDoubleClickBubbling_QTBUG29680();
    void largerThanScreen_QTBUG30142();

    void resizeStaticContentsChildWidget_QTBUG35282();

    void qmlSetParentHelper();

    void testForOutsideWSRangeFlag();

    void tabletTracking();

    void closeEvent();
    void closeWithChildWindow();

    void winIdAfterClose();
    void receivesLanguageChangeEvent();
    void receivesApplicationFontChangeEvent();
    void receivesApplicationPaletteChangeEvent();
    void deleteWindowInCloseEvent();
    void quitOnClose();

    void setParentChangesFocus_data();
    void setParentChangesFocus();

    void activateWhileModalHidden();

#ifdef Q_OS_ANDROID
    void showFullscreenAndroid();
#endif

    void explicitShowHide();

    void dragEnterLeaveSymmetry();
    void setVisibleDuringDestruction();

    void reparentWindowHandles_data();
    void reparentWindowHandles();

private:
    const QString m_platform;
    QSize m_testWidgetSize;
    QPoint m_availableTopLeft;
    QPoint m_safeCursorPos;
    const bool m_windowsAnimationsEnabled;
    QPointingDevice *m_touchScreen;
    const int m_fuzz;
    QPalette simplePalette();

private:
    enum class ScreenPosition {
        OffAbove,
        OffLeft,
        OffBelow,
        OffRight,
        Contained
    };
};

// Testing get/set functions
void tst_QWidget::getSetCheck()
{
    QWidget obj1;
    QWidget child1(&obj1);
    // QStyle * QWidget::style()
    // void QWidget::setStyle(QStyle *)
    QScopedPointer<QStyle> var1(QStyleFactory::create(QLatin1String("Windows")));
    obj1.setStyle(var1.data());
    QCOMPARE(static_cast<QStyle *>(var1.data()), obj1.style());
    obj1.setStyle(nullptr);
    QVERIFY(var1.data() != obj1.style());
    QVERIFY(obj1.style() != nullptr); // style can never be 0 for a widget

    const QRegularExpression negativeNotPossible(u"^.*Negative sizes \\(.*\\) are not possible$"_s);
    const QRegularExpression largestAllowedSize(u"^.*The largest allowed size is \\(.*\\)$"_s);
    // int QWidget::minimumWidth()
    // void QWidget::setMinimumWidth(int)
    obj1.setMinimumWidth(0);
    QCOMPARE(obj1.minimumWidth(), 0);
    QTest::ignoreMessage(QtWarningMsg, negativeNotPossible);
    obj1.setMinimumWidth(INT_MIN);
    QCOMPARE(obj1.minimumWidth(), 0); // A widgets width can never be less than 0
    QTest::ignoreMessage(QtWarningMsg, largestAllowedSize);
    obj1.setMinimumWidth(INT_MAX);

    child1.setMinimumWidth(0);
    QCOMPARE(child1.minimumWidth(), 0);
    QTest::ignoreMessage(QtWarningMsg, negativeNotPossible);
    child1.setMinimumWidth(INT_MIN);
    QCOMPARE(child1.minimumWidth(), 0); // A widgets width can never be less than 0
    QTest::ignoreMessage(QtWarningMsg, largestAllowedSize);
    child1.setMinimumWidth(INT_MAX);
    QCOMPARE(child1.minimumWidth(), QWIDGETSIZE_MAX); // The largest minimum size should only be as big as the maximium

    // int QWidget::minimumHeight()
    // void QWidget::setMinimumHeight(int)
    obj1.setMinimumHeight(0);
    QCOMPARE(obj1.minimumHeight(), 0);
    QTest::ignoreMessage(QtWarningMsg, negativeNotPossible);
    obj1.setMinimumHeight(INT_MIN);
    QCOMPARE(obj1.minimumHeight(), 0); // A widgets height can never be less than 0
    QTest::ignoreMessage(QtWarningMsg, largestAllowedSize);
    obj1.setMinimumHeight(INT_MAX);

    child1.setMinimumHeight(0);
    QCOMPARE(child1.minimumHeight(), 0);
    QTest::ignoreMessage(QtWarningMsg, negativeNotPossible);
    child1.setMinimumHeight(INT_MIN);
    QCOMPARE(child1.minimumHeight(), 0); // A widgets height can never be less than 0
    QTest::ignoreMessage(QtWarningMsg, largestAllowedSize);
    child1.setMinimumHeight(INT_MAX);
    QCOMPARE(child1.minimumHeight(), QWIDGETSIZE_MAX); // The largest minimum size should only be as big as the maximium

    // int QWidget::maximumWidth()
    // void QWidget::setMaximumWidth(int)
    obj1.setMaximumWidth(0);
    QCOMPARE(obj1.maximumWidth(), 0);
    QTest::ignoreMessage(QtWarningMsg, negativeNotPossible);
    obj1.setMaximumWidth(INT_MIN);
    QCOMPARE(obj1.maximumWidth(), 0); // A widgets width can never be less than 0
    QTest::ignoreMessage(QtWarningMsg, largestAllowedSize);
    obj1.setMaximumWidth(INT_MAX);
    QCOMPARE(obj1.maximumWidth(), QWIDGETSIZE_MAX); // QWIDGETSIZE_MAX is the abs max, not INT_MAX

    // int QWidget::maximumHeight()
    // void QWidget::setMaximumHeight(int)
    obj1.setMaximumHeight(0);
    QCOMPARE(obj1.maximumHeight(), 0);
    QTest::ignoreMessage(QtWarningMsg, negativeNotPossible);
    obj1.setMaximumHeight(INT_MIN);
    QCOMPARE(obj1.maximumHeight(), 0); // A widgets height can never be less than 0
    QTest::ignoreMessage(QtWarningMsg, largestAllowedSize);
    obj1.setMaximumHeight(INT_MAX);
    QCOMPARE(obj1.maximumHeight(), QWIDGETSIZE_MAX); // QWIDGETSIZE_MAX is the abs max, not INT_MAX

    // back to normal
    obj1.setMinimumWidth(0);
    obj1.setMinimumHeight(0);
    obj1.setMaximumWidth(QWIDGETSIZE_MAX);
    obj1.setMaximumHeight(QWIDGETSIZE_MAX);

    // const QPalette & QWidget::palette()
    // void QWidget::setPalette(const QPalette &)
    QPalette var6;
    obj1.setPalette(var6);
    QCOMPARE(var6, obj1.palette());
    obj1.setPalette(QPalette());
    QCOMPARE(QPalette(), obj1.palette());

    // const QFont & QWidget::font()
    // void QWidget::setFont(const QFont &)
    QFont var7;
    obj1.setFont(var7);
    QCOMPARE(var7, obj1.font());
    obj1.setFont(QFont());
    QCOMPARE(QFont(), obj1.font());

    // qreal QWidget::windowOpacity()
    // void QWidget::setWindowOpacity(qreal)
    obj1.setWindowOpacity(0.0);
    QCOMPARE(0.0, obj1.windowOpacity());
    obj1.setWindowOpacity(1.1);
    QCOMPARE(1.0, obj1.windowOpacity()); // 1.0 is the fullest opacity possible

    // QWidget * QWidget::focusProxy()
    // void QWidget::setFocusProxy(QWidget *)
    {
        QScopedPointer<QWidget> var9(new QWidget());
        obj1.setFocusProxy(var9.data());
        QCOMPARE(var9.data(), obj1.focusProxy());
        obj1.setFocusProxy(nullptr);
        QCOMPARE(nullptr, obj1.focusProxy());
    }

    // const QRect & QWidget::geometry()
    // void QWidget::setGeometry(const QRect &)
    QCoreApplication::processEvents();
    QRect var10(10, 10, 100, 100);
    obj1.setGeometry(var10);
    QCoreApplication::processEvents();
    qDebug() << obj1.geometry();
    QCOMPARE(var10, obj1.geometry());
    obj1.setGeometry(QRect(0,0,0,0));
    qDebug() << obj1.geometry();
    QCOMPARE(QRect(0,0,0,0), obj1.geometry());

    // QLayout * QWidget::layout()
    // void QWidget::setLayout(QLayout *)
    QBoxLayout *var11 = new QBoxLayout(QBoxLayout::LeftToRight);
    obj1.setLayout(var11);
    QCOMPARE(static_cast<QLayout *>(var11), obj1.layout());
    QTest::ignoreMessage(QtWarningMsg, "QWidget::setLayout: Cannot set layout to 0");
    obj1.setLayout(nullptr);
    QCOMPARE(static_cast<QLayout *>(var11), obj1.layout()); // You cannot set a 0-pointer layout, that keeps the current
    delete var11; // This will remove the layout from the widget
    QCOMPARE(nullptr, obj1.layout());

    // bool QWidget::acceptDrops()
    // void QWidget::setAcceptDrops(bool)
    obj1.setAcceptDrops(false);
    QCOMPARE(false, obj1.acceptDrops());
    obj1.setAcceptDrops(true);
    QCOMPARE(true, obj1.acceptDrops());

    // bool QWidget::autoFillBackground()
    // void QWidget::setAutoFillBackground(bool)
    obj1.setAutoFillBackground(false);
    QCOMPARE(false, obj1.autoFillBackground());
    obj1.setAutoFillBackground(true);
    QCOMPARE(true, obj1.autoFillBackground());

    var1.reset();
#if defined (Q_OS_WIN)
    obj1.setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
    const HWND handle = reinterpret_cast<HWND>(obj1.winId());   // explicitly create window handle
    QVERIFY(GetWindowLongPtr(handle, GWL_STYLE) & LONG_PTR(WS_POPUP));
#endif
}

tst_QWidget::tst_QWidget()
    : m_platform(QGuiApplication::platformName().toLower())
    , m_safeCursorPos(0, 0)
    , m_windowsAnimationsEnabled(windowsAnimationsEnabled())
    , m_touchScreen(QTest::createTouchDevice())
    , m_fuzz(int(QGuiApplication::primaryScreen()->devicePixelRatio()))
{
    if (m_windowsAnimationsEnabled) // Disable animations which can interfere with screen grabbing in moveChild(), showAndMoveChild()
        setWindowsAnimationsEnabled(false);
    QFont font;
    font.setBold(true);
    font.setPointSize(42);
    QApplication::setFont(font, "QPropagationTestWidget");

    QPalette palette;
    palette.setColor(QPalette::ToolTipBase, QColor(12, 13, 14));
    palette.setColor(QPalette::Text, QColor(21, 22, 23));
    QApplication::setPalette(palette, "QPropagationTestWidget");

    if (QApplication::platformName().startsWith(QLatin1String("wayland")))
        qputenv("QT_WAYLAND_DISABLE_WINDOWDECORATION", "1");
}

tst_QWidget::~tst_QWidget()
{
    if (m_windowsAnimationsEnabled)
        setWindowsAnimationsEnabled(m_windowsAnimationsEnabled);

    delete m_touchScreen;
}

void tst_QWidget::initTestCase()
{
#ifdef Q_OS_ANDROID
    if (QNativeInterface::QAndroidApplication::sdkVersion() == 33)
        QSKIP("Is flaky on Android 13 / RHEL 8.6 and 8.8 (QTQAINFRA-5606)");
#endif
    // Size of reference widget, 200 for < 2000, scale up for larger screens
    // to avoid Windows warnings about minimum size for decorated windows.
    int width = 200;
    const QScreen *screen = QGuiApplication::primaryScreen();
    const QRect availableGeometry = screen->availableGeometry();
    m_availableTopLeft = availableGeometry.topLeft();
    // XCB: Determine "safe" cursor position at bottom/right corner of screen.
    // Pushing the mouse rapidly to the top left corner can trigger KDE / KWin's
    // "Present all Windows" (Ctrl+F9) feature also programmatically.
    if (m_platform == QLatin1String("xcb"))
        m_safeCursorPos = availableGeometry.bottomRight() - QPoint(40, 40);
    const int screenWidth = screen->geometry().width();
    if (screenWidth > 2000)
        width = 100 * ((screenWidth + 500) / 1000);
    m_testWidgetSize = QSize(width, width);
}

void tst_QWidget::cleanup()
{
    QTRY_VERIFY(QApplication::topLevelWidgets().isEmpty());
}

template <typename T>
struct ImplicitlyConvertibleTo {
    T t;
    operator const T() const { return t; }
    operator T() { return t; }
};

void testFunction0() {}
void testFunction1(bool) {}

void tst_QWidget::nativeWindowAttribute()
{
    QWidget parent;
    QWidget child(&parent);

    QCOMPARE(parent.windowHandle(), nullptr);
    QCOMPARE(child.windowHandle(), nullptr);

    // Setting WA_NativeWindow should create window handle
    parent.setAttribute(Qt::WA_NativeWindow);
    QVERIFY(parent.windowHandle() != nullptr);
    // But not its child's window handle
    QCOMPARE(child.windowHandle(), nullptr);
    // Until the child also gains WA_NativeWindow
    child.setAttribute(Qt::WA_NativeWindow);
    QVERIFY(child.windowHandle() != nullptr);
}

void tst_QWidget::addActionOverloads()
{
    // almost exhaustive check of addAction() overloads:
    // (text), (icon, text), (icon, text, shortcut), (text, shortcut)
    // each with a good sample of ways to QObject::connect() to
    // QAction::triggered(bool)
    QWidget w;

    // don't just pass QString etc - that'd be too easy (think QStringBuilder)
    ImplicitlyConvertibleTo<QString> text = {QStringLiteral("foo")};
    ImplicitlyConvertibleTo<QIcon> icon;

    const auto check = [&](auto &...args) { // don't need to perfectly-forward, only lvalues passed
        w.addAction(args...);

        w.addAction(args..., &w, SLOT(deleteLater()));
        w.addAction(args..., &w, &QObject::deleteLater);
        w.addAction(args..., testFunction0);
        w.addAction(args..., &w, testFunction0);
        w.addAction(args..., testFunction1);
        w.addAction(args..., &w, testFunction1);
        w.addAction(args..., [&](bool b) { w.setEnabled(b); });
        w.addAction(args..., &w, [&](bool b) { w.setEnabled(b); });

        w.addAction(args..., &w, SLOT(deleteLater()), Qt::QueuedConnection);
        w.addAction(args..., &w, &QObject::deleteLater, Qt::QueuedConnection);
        // doesn't exist: w.addAction(args..., testFunction0, Qt::QueuedConnection);
        w.addAction(args..., &w, testFunction0, Qt::QueuedConnection);
        // doesn't exist: w.addAction(args..., testFunction1, Qt::QueuedConnection);
        w.addAction(args..., &w, testFunction1, Qt::QueuedConnection);
        // doesn't exist: w.addAction(args..., [&](bool b) { w.setEnabled(b); }, Qt::QueuedConnection);
        w.addAction(args..., &w, [&](bool b) { w.setEnabled(b); }, Qt::QueuedConnection);
    };
    const auto check1 = [&](auto &arg, auto &...args) {
        check(arg, args...);
        check(std::as_const(arg), args...);
    };
    const auto check2 = [&](auto &arg1, auto &arg2, auto &...args) {
        check1(arg1, arg2, args...);
        check1(arg1, std::as_const(arg2), args...);
    };
    [[maybe_unused]]
    const auto check3 = [&](auto &arg1, auto &arg2, auto &arg3) {
        check2(arg1, arg2, arg3);
        check2(arg1, arg2, std::as_const(arg3));
    };

    check1(text);
    check2(icon, text);
#ifndef QT_NO_SHORTCUT
    ImplicitlyConvertibleTo<QKeySequence> keySequence = {Qt::CTRL | Qt::Key_C};
    check2(text, keySequence);
    check3(icon, text, keySequence);
#endif
}

void tst_QWidget::fontPropagation()
{
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->show();
    QVERIFY(QTest::qWaitForWindowExposed(testWidget.data()));
    QFont font = testWidget->font();
    QWidget* childWidget = new QWidget( testWidget.data() );
    childWidget->show();
    QCOMPARE( font, childWidget->font() );

    font.setBold( true );
    testWidget->setFont( font );
    QCOMPARE( font, testWidget->font() );
    QCOMPARE( font, childWidget->font() );

    QFont newFont = font;
    newFont.setItalic( true );
    childWidget->setFont( newFont );
    QWidget* grandChildWidget = new QWidget( childWidget );
    QCOMPARE( font, testWidget->font() );
    QCOMPARE( newFont, grandChildWidget->font() );

    font.setUnderline( true );
    testWidget->setFont( font );

    // the child and grand child should now have merged bold and
    // underline
    newFont.setUnderline( true );

    QCOMPARE( newFont, childWidget->font() );
    QCOMPARE( newFont, grandChildWidget->font() );

    // make sure font propagation continues working after reparenting
    font = testWidget->font();
    font.setPointSize(font.pointSize() + 2);
    testWidget->setFont(font);

    QWidget *one   = new QWidget(testWidget.data());
    QWidget *two   = new QWidget(one);
    QWidget *three = new QWidget(two);
    QWidget *four  = new QWidget(two);

    four->setParent(three);
    four->move(QPoint(0,0));

    font.setPointSize(font.pointSize() + 2);
    testWidget->setFont(font);

    QCOMPARE(testWidget->font(), one->font());
    QCOMPARE(one->font(), two->font());
    QCOMPARE(two->font(), three->font());
    QCOMPARE(three->font(), four->font());

    QVERIFY(testWidget->testAttribute(Qt::WA_SetFont));
    QVERIFY(! one->testAttribute(Qt::WA_SetFont));
    QVERIFY(! two->testAttribute(Qt::WA_SetFont));
    QVERIFY(! three->testAttribute(Qt::WA_SetFont));
    QVERIFY(! four->testAttribute(Qt::WA_SetFont));

    font.setPointSize(font.pointSize() + 2);
    one->setFont(font);

    QCOMPARE(one->font(), two->font());
    QCOMPARE(two->font(), three->font());
    QCOMPARE(three->font(), four->font());

    QVERIFY(one->testAttribute(Qt::WA_SetFont));
    QVERIFY(! two->testAttribute(Qt::WA_SetFont));
    QVERIFY(! three->testAttribute(Qt::WA_SetFont));
    QVERIFY(! four->testAttribute(Qt::WA_SetFont));

    font.setPointSize(font.pointSize() + 2);
    two->setFont(font);

    QCOMPARE(two->font(), three->font());
    QCOMPARE(three->font(), four->font());

    QVERIFY(two->testAttribute(Qt::WA_SetFont));
    QVERIFY(! three->testAttribute(Qt::WA_SetFont));
    QVERIFY(! four->testAttribute(Qt::WA_SetFont));

    font.setPointSize(font.pointSize() + 2);
    three->setFont(font);

    QCOMPARE(three->font(), four->font());

    QVERIFY(three->testAttribute(Qt::WA_SetFont));
    QVERIFY(! four->testAttribute(Qt::WA_SetFont));

    font.setPointSize(font.pointSize() + 2);
    four->setFont(font);

    QVERIFY(four->testAttribute(Qt::WA_SetFont));
}

class QPropagationTestWidget : public QWidget
{
    Q_OBJECT
public:
    using QWidget::QWidget;
};

void tst_QWidget::fontPropagation2()
{
    // ! Note, the code below is executed in tst_QWidget's constructor.
    // QFont font;
    // font.setBold(true);
    // font.setPointSize(42);
    // QApplication::setFont(font, "QPropagationTestWidget");

    QScopedPointer<QWidget> root(new QWidget);
    root->setObjectName(QLatin1String("fontPropagation2"));
    root->setWindowTitle(root->objectName());
    root->resize(200, 200);

    QWidget *child0 = new QWidget(root.data());
    QWidget *child1 = new QWidget(child0);
    QWidget *child2 = new QPropagationTestWidget(child1);
    QWidget *child3 = new QWidget(child2);
    QWidget *child4 = new QWidget(child3);
    QWidget *child5 = new QWidget(child4);
    root->show();

    // Check that only the application fonts apply.
    QCOMPARE(root->font(), QApplication::font());
    QCOMPARE(child0->font(), QApplication::font());
    QCOMPARE(child1->font(), QApplication::font());
    QCOMPARE(child2->font().pointSize(), 42);
    QVERIFY(child2->font().bold());
    QCOMPARE(child3->font().pointSize(), 42);
    QVERIFY(child3->font().bold());
    QCOMPARE(child4->font().pointSize(), 42);
    QVERIFY(child4->font().bold());
    QCOMPARE(child5->font().pointSize(), 42);
    QVERIFY(child5->font().bold());

    // Set child0's font size to 15, and remove bold on child4.
    QFont font;
    font.setPointSize(15);
    child0->setFont(font);
    QFont unboldFont;
    unboldFont.setBold(false);
    child4->setFont(unboldFont);

    // Check that the above settings propagate correctly.
    QCOMPARE(root->font(), QApplication::font());
    QCOMPARE(child0->font().pointSize(), 15);
    QVERIFY(!child0->font().bold());
    QCOMPARE(child1->font().pointSize(), 15);
    QVERIFY(!child1->font().bold());
    QCOMPARE(child2->font().pointSize(), 15);
    QVERIFY(child2->font().bold());
    QCOMPARE(child3->font().pointSize(), 15);
    QVERIFY(child3->font().bold());
    QCOMPARE(child4->font().pointSize(), 15);
    QVERIFY(!child4->font().bold());
    QCOMPARE(child5->font().pointSize(), 15);
    QVERIFY(!child5->font().bold());

    // Replace the app font for child2. Italic should propagate
    // but the size should still be ignored. The previous bold
    // setting is gone.
    QFont italicSizeFont;
    italicSizeFont.setItalic(true);
    italicSizeFont.setPointSize(33);
    QApplication::setFont(italicSizeFont, "QPropagationTestWidget");

    // Check that this propagates correctly.
    QCOMPARE(root->font(), QApplication::font());
    QCOMPARE(child0->font().pointSize(), 15);
    QVERIFY(!child0->font().bold());
    QVERIFY(!child0->font().italic());
    QCOMPARE(child1->font().pointSize(), 15);
    QVERIFY(!child1->font().bold());
    QVERIFY(!child1->font().italic());
    QCOMPARE(child2->font().pointSize(), 15);
    QVERIFY(!child2->font().bold());
    QVERIFY(child2->font().italic());
    QCOMPARE(child3->font().pointSize(), 15);
    QVERIFY(!child3->font().bold());
    QVERIFY(child3->font().italic());
    QCOMPARE(child4->font().pointSize(), 15);
    QVERIFY(!child4->font().bold());
    QVERIFY(child4->font().italic());
    QCOMPARE(child5->font().pointSize(), 15);
    QVERIFY(!child5->font().bold());
    QVERIFY(child5->font().italic());
}

void tst_QWidget::fontPropagation3()
{
    QWidget parent;
    QWidget *child = new QWidget(&parent);
    parent.setFont(QFont("Monospace", 9));
    QImage image(32, 32, QImage::Format_RGB32);
    QPainter p(&image);
    p.setFont(child->font());
    QCOMPARE(p.font().family(), child->font().family());
    QCOMPARE(p.font().pointSize(), child->font().pointSize());
}

/*!
    This tests that children that are added to a widget with an explicitly
    defined font inherit that font correctly, merging (and overriding)
    with the font that might be defined by the platform theme.
*/
void tst_QWidget::fontPropagationDynamic()
{
    // override side effects from previous tests
    QFont themedFont;
    themedFont.setBold(true);
    themedFont.setPointSize(42);
    QApplication::setFont(themedFont, "QPropagationTestWidget");

    QWidget parent;
    QWidget firstChild(&parent);

    const QFont defaultFont = parent.font();
    QFont appFont = defaultFont;
    appFont.setPointSize(72);

    // sanity check
    QVERIFY(themedFont != defaultFont);
    QVERIFY(themedFont != appFont);

    // palette propagates to existing children
    parent.setFont(appFont);
    QCOMPARE(firstChild.font().pointSize(), appFont.pointSize());

    // palatte propagates to children added later
    QWidget secondChild(&parent);
    QCOMPARE(secondChild.font().pointSize(), appFont.pointSize());
    QWidget thirdChild;
    QCOMPARE(thirdChild.font().pointSize(), defaultFont.pointSize());
    thirdChild.setParent(&parent);
    QCOMPARE(thirdChild.font().pointSize(), appFont.pointSize());

    // even if the child has an override in QApplication::font
    QPropagationTestWidget themedChild;
    themedChild.ensurePolished(); // needed for default font to be set up
    QCOMPARE(themedChild.font().pointSize(), themedFont.pointSize());
    QCOMPARE(themedChild.font().bold(), themedFont.bold());
    themedChild.setParent(&parent);
    QCOMPARE(themedChild.font().pointSize(), appFont.pointSize());
    QCOMPARE(themedChild.font().bold(), themedFont.bold());

    // grand children as well
    QPropagationTestWidget themedGrandChild;
    themedGrandChild.setParent(&themedChild);
    QCOMPARE(themedGrandChild.font().pointSize(), appFont.pointSize());
    QCOMPARE(themedGrandChild.font().bold(), themedFont.bold());

    // child with own font attribute does not inherit from parent
    QFont childFont = defaultFont;
    childFont.setPointSize(9);
    QWidget modifiedChild;
    modifiedChild.setFont(childFont);
    modifiedChild.setParent(&parent);
    QCOMPARE(modifiedChild.font().pointSize(), childFont.pointSize());
}

void tst_QWidget::palettePropagation()
{
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->show();
    QVERIFY(QTest::qWaitForWindowExposed(testWidget.data()));

    QPalette palette = testWidget->palette();
    QWidget* childWidget = new QWidget( testWidget.data() );
    childWidget->show();
    QCOMPARE( palette, childWidget->palette() );

    palette.setColor( QPalette::Base, Qt::red );
    testWidget->setPalette( palette );
    QCOMPARE( palette, testWidget->palette() );
    QCOMPARE( palette, childWidget->palette() );

    QPalette newPalette = palette;
    newPalette.setColor( QPalette::Highlight, Qt::green );
    childWidget->setPalette( newPalette );
    QWidget* grandChildWidget = new QWidget( childWidget );
    QCOMPARE( palette, testWidget->palette() );
    QCOMPARE( newPalette, grandChildWidget->palette() );

    palette.setColor( QPalette::Text, Qt::blue );
    testWidget->setPalette( palette );

    // the child and grand child should now have merged green
    // highlight and blue text
    newPalette.setColor( QPalette::Text, Qt::blue);

    QCOMPARE( newPalette, childWidget->palette() );
    QCOMPARE( newPalette, grandChildWidget->palette() );
}

void tst_QWidget::palettePropagation2()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    // ! Note, the code below is executed in tst_QWidget's constructor.
    // QPalette palette;
    // palette.setColor(QPalette::ToolTipBase, QColor(12, 13, 14));
    // palette.setColor(QPalette::Text, QColor(21, 22, 23));
    // qApp->setPalette(palette, "QPropagationTestWidget");

    QScopedPointer<QWidget> root(new QWidget);
    root->setObjectName(QLatin1String("palettePropagation2"));
    root->setWindowTitle(root->objectName());
    root->resize(200, 200);
    QWidget *child0 = new QWidget(root.data());
    QWidget *child1 = new QWidget(child0);
    QWidget *child2 = new QPropagationTestWidget(child1);
    QWidget *child3 = new QWidget(child2);
    QWidget *child4 = new QWidget(child3);
    QWidget *child5 = new QWidget(child4);
    root->show();
    QVERIFY(QTest::qWaitForWindowExposed(root.data()));

    // These colors are unlikely to be imposed on the default palette of
    // QWidget ;-).
    QColor sysPalText(21, 22, 23);
    QColor sysPalToolTipBase(12, 13, 14);
    QColor overridePalText(42, 43, 44);
    QColor overridePalToolTipBase(45, 46, 47);
    QColor sysPalButton(99, 98, 97);

    // Check that only the application fonts apply.
    QPalette appPal = QApplication::palette();
    QCOMPARE(root->palette(), appPal);
    QCOMPARE(child0->palette(), appPal);
    QCOMPARE(child1->palette(), appPal);
    QCOMPARE(child2->palette().color(QPalette::ToolTipBase), sysPalToolTipBase);
    QCOMPARE(child2->palette().color(QPalette::Text), sysPalText);
    QCOMPARE(child2->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child3->palette().color(QPalette::ToolTipBase), sysPalToolTipBase);
    QCOMPARE(child3->palette().color(QPalette::Text), sysPalText);
    QCOMPARE(child3->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child4->palette().color(QPalette::ToolTipBase), sysPalToolTipBase);
    QCOMPARE(child4->palette().color(QPalette::Text), sysPalText);
    QCOMPARE(child4->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child5->palette().color(QPalette::ToolTipBase), sysPalToolTipBase);
    QCOMPARE(child5->palette().color(QPalette::Text), sysPalText);
    QCOMPARE(child5->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));

    // Set child0's Text, and set ToolTipBase on child4.
    QPalette textPalette;
    textPalette.setColor(QPalette::Text, overridePalText);
    child0->setPalette(textPalette);
    QPalette toolTipPalette;
    toolTipPalette.setColor(QPalette::ToolTipBase, overridePalToolTipBase);
    child4->setPalette(toolTipPalette);

    // Check that the above settings propagate correctly.
    QCOMPARE(root->palette(), appPal);
    QCOMPARE(child0->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child0->palette().color(QPalette::ToolTipBase), appPal.color(QPalette::ToolTipBase));
    QCOMPARE(child0->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child1->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child1->palette().color(QPalette::ToolTipBase), appPal.color(QPalette::ToolTipBase));
    QCOMPARE(child1->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child2->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child2->palette().color(QPalette::ToolTipBase), sysPalToolTipBase);
    QCOMPARE(child2->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child3->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child3->palette().color(QPalette::ToolTipBase), sysPalToolTipBase);
    QCOMPARE(child3->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child4->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child4->palette().color(QPalette::ToolTipBase), overridePalToolTipBase);
    QCOMPARE(child4->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child5->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child5->palette().color(QPalette::ToolTipBase), overridePalToolTipBase);
    QCOMPARE(child5->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));

    // Replace the app palette for child2. Button should propagate but Text
    // should still be ignored. The previous ToolTipBase setting is gone.
    QPalette buttonPalette;
    buttonPalette.setColor(QPalette::ToolTipText, sysPalButton);
    QApplication::setPalette(buttonPalette, "QPropagationTestWidget");

    // Check that the above settings propagate correctly.
    QCOMPARE(root->palette(), appPal);
    QCOMPARE(child0->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child0->palette().color(QPalette::ToolTipBase), appPal.color(QPalette::ToolTipBase));
    QCOMPARE(child0->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child1->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child1->palette().color(QPalette::ToolTipBase), appPal.color(QPalette::ToolTipBase));
    QCOMPARE(child1->palette().color(QPalette::ToolTipText), appPal.color(QPalette::ToolTipText));
    QCOMPARE(child2->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child2->palette().color(QPalette::ToolTipBase), appPal.color(QPalette::ToolTipBase));
    QCOMPARE(child2->palette().color(QPalette::ToolTipText), sysPalButton);
    QCOMPARE(child3->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child3->palette().color(QPalette::ToolTipBase), appPal.color(QPalette::ToolTipBase));
    QCOMPARE(child3->palette().color(QPalette::ToolTipText), sysPalButton);
    QCOMPARE(child4->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child4->palette().color(QPalette::ToolTipBase), overridePalToolTipBase);
    QCOMPARE(child4->palette().color(QPalette::ToolTipText), sysPalButton);
    QCOMPARE(child5->palette().color(QPalette::Text), overridePalText);
    QCOMPARE(child5->palette().color(QPalette::ToolTipBase), overridePalToolTipBase);
    QCOMPARE(child5->palette().color(QPalette::ToolTipText), sysPalButton);
}

/*!
    This tests that children that are added to a widget with an explicitly
    defined palette inherit that palette correctly, merging (and overriding)
    with the palette that might be defined by the platform theme.
*/
void tst_QWidget::palettePropagationDynamic()
{
    // override side effects from previous tests
    QPalette themedPalette;
    themedPalette.setColor(QPalette::ToolTipBase, QColor(12, 13, 14));
    themedPalette.setColor(QPalette::Text, QColor(21, 22, 23));
    QApplication::setPalette(themedPalette, "QPropagationTestWidget");

    QWidget parent;
    QWidget firstChild(&parent);

    const QPalette defaultPalette = parent.palette();
    QPalette appPalette = defaultPalette;
    const QColor appColor(1, 2, 3);
    appPalette.setColor(QPalette::Text, appColor);

    // sanity check
    QVERIFY(themedPalette != defaultPalette);
    QVERIFY(themedPalette != appPalette);

    // palette propagates to existing children
    parent.setPalette(appPalette);
    QCOMPARE(firstChild.palette().color(QPalette::Text), appPalette.color(QPalette::Text));

    // palatte propagates to children added later
    QWidget secondChild(&parent);
    QCOMPARE(secondChild.palette().color(QPalette::Text), appPalette.color(QPalette::Text));
    QWidget thirdChild;
    QCOMPARE(thirdChild.palette().color(QPalette::Text), defaultPalette.color(QPalette::Text));
    thirdChild.setParent(&parent);
    QCOMPARE(thirdChild.palette().color(QPalette::Text), appPalette.color(QPalette::Text));

    // even if the child has an override in QApplication::palette
    QPropagationTestWidget themedChild;
    themedChild.ensurePolished(); // needed for default palette to be set up
    QCOMPARE(themedChild.palette().color(QPalette::Text), themedPalette.color(QPalette::Text));
    QCOMPARE(themedChild.palette().color(QPalette::ToolTipBase), themedPalette.color(QPalette::ToolTipBase));
    themedChild.setParent(&parent);
    QCOMPARE(themedChild.palette().color(QPalette::Text), appPalette.color(QPalette::Text));
    QCOMPARE(themedChild.palette().color(QPalette::ToolTipBase), themedPalette.color(QPalette::ToolTipBase));

    // grand children as well
    QPropagationTestWidget themedGrandChild;
    themedGrandChild.setParent(&themedChild);
    QCOMPARE(themedGrandChild.palette().color(QPalette::Text), appPalette.color(QPalette::Text));
    QCOMPARE(themedGrandChild.palette().color(QPalette::ToolTipBase), themedPalette.color(QPalette::ToolTipBase));

    // child with own color does not inherit from parent
    QPalette childPalette = defaultPalette;
    childPalette.setColor(QPalette::Text, Qt::red);
    QWidget modifiedChild;
    modifiedChild.setPalette(childPalette);
    modifiedChild.setParent(&parent);
    QCOMPARE(modifiedChild.palette().color(QPalette::Text), childPalette.color(QPalette::Text));

}

void tst_QWidget::enabledPropagation()
{
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->show();
    QVERIFY(QTest::qWaitForWindowExposed(testWidget.data()));
    QWidget* childWidget = new QWidget( testWidget.data() );
    childWidget->show();
    QVERIFY( testWidget->isEnabled() );
    QVERIFY( childWidget->isEnabled() );

    testWidget->setEnabled( false );
    QVERIFY( !testWidget->isEnabled() );
    QVERIFY( !childWidget->isEnabled() );

    testWidget->setDisabled( false );
    QVERIFY( testWidget->isEnabled() );
    QVERIFY( childWidget->isEnabled() );

    QWidget* grandChildWidget = new QWidget( childWidget );
    QVERIFY( grandChildWidget->isEnabled() );

    testWidget->setDisabled( true );
    QVERIFY( !testWidget->isEnabled() );
    QVERIFY( !childWidget->isEnabled() );
    QVERIFY( !grandChildWidget->isEnabled() );

    grandChildWidget->setEnabled( false );
    testWidget->setEnabled( true );
    QVERIFY( testWidget->isEnabled() );
    QVERIFY( childWidget->isEnabled() );
    QVERIFY( !grandChildWidget->isEnabled() );

    grandChildWidget->setEnabled( true );
    testWidget->setEnabled( false );
    childWidget->setDisabled( true );
    testWidget->setEnabled( true );
    QVERIFY( testWidget->isEnabled() );
    QVERIFY( !childWidget->isEnabled() );
    QVERIFY( !grandChildWidget->isEnabled() );
}

void tst_QWidget::ignoreKeyEventsWhenDisabled_QTBUG27417()
{
    QLineEdit lineEdit;
    lineEdit.setWindowTitle(__FUNCTION__);
    lineEdit.setMinimumWidth(m_testWidgetSize.width());
    centerOnScreen(&lineEdit);
    lineEdit.setDisabled(true);
    lineEdit.show();
    QTest::ignoreMessage(QtWarningMsg, "Keyboard event not accepted by receiving widget");
    QTest::ignoreMessage(QtWarningMsg, "Keyboard event not accepted by receiving widget");
    QTest::keyClick(&lineEdit, Qt::Key_A);
    QTRY_VERIFY(lineEdit.text().isEmpty());
}

void tst_QWidget::properTabHandlingWhenDisabled_QTBUG27417()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QWidget widget;
    widget.setWindowTitle(__FUNCTION__);
    widget.setMinimumWidth(m_testWidgetSize.width());
    centerOnScreen(&widget);
    QVBoxLayout *layout = new QVBoxLayout();
    QLineEdit *lineEdit = new QLineEdit();
    layout->addWidget(lineEdit);
    QLineEdit *lineEdit2 = new QLineEdit();
    layout->addWidget(lineEdit2);
    QLineEdit *lineEdit3 = new QLineEdit();
    layout->addWidget(lineEdit3);
    widget.setLayout(layout);
    widget.show();

    lineEdit->setFocus();
    QTRY_VERIFY(lineEdit->hasFocus());
    QTest::keyClick(&widget, Qt::Key_Tab);
    QTRY_VERIFY(lineEdit2->hasFocus());
    QTest::keyClick(&widget, Qt::Key_Tab);
    QTRY_VERIFY(lineEdit3->hasFocus());

    lineEdit2->setDisabled(true);
    lineEdit->setFocus();
    QTRY_VERIFY(lineEdit->hasFocus());
    QTest::keyClick(&widget, Qt::Key_Tab);
    QTRY_VERIFY(!lineEdit2->hasFocus());
    QVERIFY(lineEdit3->hasFocus());
}

// Drag'n drop disabled in this build.
#if QT_CONFIG(draganddrop)
void tst_QWidget::acceptDropsPropagation()
{
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->show();
    QVERIFY(QTest::qWaitForWindowExposed(testWidget.data()));
    QWidget *childWidget = new QWidget(testWidget.data());
    childWidget->show();
    QVERIFY(!testWidget->acceptDrops());
    QVERIFY(!childWidget->acceptDrops());

    testWidget->setAcceptDrops(true);
    QVERIFY(testWidget->acceptDrops());
    QVERIFY(!childWidget->acceptDrops());
    QVERIFY(childWidget->testAttribute(Qt::WA_DropSiteRegistered));

    testWidget->setAcceptDrops(false);
    QVERIFY(!testWidget->acceptDrops());
    QVERIFY(!childWidget->acceptDrops());
    QVERIFY(!childWidget->testAttribute(Qt::WA_DropSiteRegistered));

    QWidget *grandChildWidget = new QWidget(childWidget);
    QVERIFY(!grandChildWidget->acceptDrops());
    QVERIFY(!grandChildWidget->testAttribute(Qt::WA_DropSiteRegistered));

    testWidget->setAcceptDrops(true);
    QVERIFY(testWidget->acceptDrops());
    QVERIFY(!childWidget->acceptDrops());
    QVERIFY(childWidget->testAttribute(Qt::WA_DropSiteRegistered));
    QVERIFY(!grandChildWidget->acceptDrops());
    QVERIFY(grandChildWidget->testAttribute(Qt::WA_DropSiteRegistered));

    grandChildWidget->setAcceptDrops(true);
    testWidget->setAcceptDrops(false);
    QVERIFY(!testWidget->acceptDrops());
    QVERIFY(!childWidget->acceptDrops());
    QVERIFY(grandChildWidget->acceptDrops());
    QVERIFY(grandChildWidget->testAttribute(Qt::WA_DropSiteRegistered));

    grandChildWidget->setAcceptDrops(false);
    QVERIFY(!grandChildWidget->testAttribute(Qt::WA_DropSiteRegistered));
    testWidget->setAcceptDrops(true);
    childWidget->setAcceptDrops(true);
    testWidget->setAcceptDrops(false);
    QVERIFY(!testWidget->acceptDrops());
    QVERIFY(childWidget->acceptDrops());
    QVERIFY(!grandChildWidget->acceptDrops());
    QVERIFY(grandChildWidget->testAttribute(Qt::WA_DropSiteRegistered));
}
#endif

void tst_QWidget::isEnabledTo()
{
    QWidget testWidget;
    testWidget.resize(m_testWidgetSize);
    testWidget.setWindowTitle(__FUNCTION__);
    centerOnScreen(&testWidget);
    testWidget.show();
    QWidget* childWidget = new QWidget( &testWidget );
    QWidget* grandChildWidget = new QWidget( childWidget );

    QVERIFY( childWidget->isEnabledTo( &testWidget ) );
    QVERIFY( grandChildWidget->isEnabledTo( &testWidget ) );

    childWidget->setEnabled( false );
    QVERIFY( !childWidget->isEnabledTo( &testWidget ) );
    QVERIFY( grandChildWidget->isEnabledTo( childWidget ) );
    QVERIFY( !grandChildWidget->isEnabledTo( &testWidget ) );

    QScopedPointer<QMainWindow> childDialog(new QMainWindow(&testWidget));
    testWidget.setEnabled(false);
    QVERIFY(!childDialog->isEnabled());
    QVERIFY(childDialog->isEnabledTo(nullptr));
}

void tst_QWidget::visible()
{
    // Ensure that the testWidget is hidden for this test at the
    // start
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    QVERIFY( !testWidget->isVisible() );
    QWidget* childWidget = new QWidget( testWidget.data() );
    QVERIFY( !childWidget->isVisible() );

    testWidget->show();
    QVERIFY(testWidget->screen());
    QVERIFY( testWidget->isVisible() );
    QVERIFY( childWidget->isVisible() );

    QWidget* grandChildWidget = new QWidget( childWidget );
    QVERIFY( !grandChildWidget->isVisible() );
    grandChildWidget->show();
    QVERIFY( grandChildWidget->isVisible() );

    grandChildWidget->hide();
    testWidget->hide();
    testWidget->show();
    QVERIFY( !grandChildWidget->isVisible() );
    QVERIFY( testWidget->isVisible() );
    QVERIFY( childWidget->isVisible() );

    grandChildWidget->show();
    childWidget->hide();
    testWidget->hide();
    testWidget->show();
    QVERIFY( testWidget->isVisible() );
    QVERIFY( !childWidget->isVisible() );
    QVERIFY( !grandChildWidget->isVisible() );

    grandChildWidget->show();
    QVERIFY( !grandChildWidget->isVisible() );
}

void tst_QWidget::setLocale()
{
    QWidget w;
    QCOMPARE(w.locale(), QLocale());

    w.setLocale(QLocale::Italian);
    QCOMPARE(w.locale(), QLocale(QLocale::Italian));

    QWidget child1(&w);
    QCOMPARE(child1.locale(), QLocale(QLocale::Italian));

    w.unsetLocale();
    QCOMPARE(w.locale(), QLocale());
    QCOMPARE(child1.locale(), QLocale());

    w.setLocale(QLocale::French);
    QCOMPARE(w.locale(), QLocale(QLocale::French));
    QCOMPARE(child1.locale(), QLocale(QLocale::French));

    child1.setLocale(QLocale::Italian);
    QCOMPARE(w.locale(), QLocale(QLocale::French));
    QCOMPARE(child1.locale(), QLocale(QLocale::Italian));

    child1.unsetLocale();
    QCOMPARE(w.locale(), QLocale(QLocale::French));
    QCOMPARE(child1.locale(), QLocale(QLocale::French));

    QWidget child2;
    QCOMPARE(child2.locale(), QLocale());
    child2.setParent(&w);
    QCOMPARE(child2.locale(), QLocale(QLocale::French));
}

void tst_QWidget::propagateLocale()
{
    QWidget parent;
    parent.setLocale(QLocale::French);
    // Non-window widget; propagates locale:
    QWidget *child = new QWidget(&parent);
    QVERIFY(!child->isWindow());
    QVERIFY(!child->testAttribute(Qt::WA_WindowPropagation));
    QCOMPARE(child->locale(), QLocale(QLocale::French));
    parent.setLocale(QLocale::Italian);
    QCOMPARE(child->locale(), QLocale(QLocale::Italian));
    delete child;
    // Window: doesn't propagate locale:
    child = new QWidget(&parent, Qt::Window);
    QVERIFY(child->isWindow());
    QVERIFY(!child->testAttribute(Qt::WA_WindowPropagation));
    QCOMPARE(child->locale(), QLocale());
    parent.setLocale(QLocale::French);
    QCOMPARE(child->locale(), QLocale());
    // ... unless we tell it to:
    child->setAttribute(Qt::WA_WindowPropagation, true);
    QVERIFY(child->testAttribute(Qt::WA_WindowPropagation));
    QCOMPARE(child->locale(), QLocale(QLocale::French));
    parent.setLocale(QLocale::Italian);
    QCOMPARE(child->locale(), QLocale(QLocale::Italian));
}

void tst_QWidget::visible_setWindowOpacity()
{
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->winId();

    QVERIFY( !testWidget->isVisible() );
    testWidget->setWindowOpacity(0.5);
#if defined(Q_OS_WIN)
    QVERIFY(!::IsWindowVisible(winHandleOf(testWidget.data())));
#endif
    testWidget->setWindowOpacity(1.0);
}

void tst_QWidget::isVisibleTo()
{
    // Ensure that the testWidget is hidden for this test at the
    // start
    QWidget testWidget;
    testWidget.resize(m_testWidgetSize);
    testWidget.setWindowTitle(__FUNCTION__);
    centerOnScreen(&testWidget);

    QWidget* childWidget = new QWidget( &testWidget );
    QVERIFY( childWidget->isVisibleTo( &testWidget ) );
    childWidget->hide();
    QVERIFY( !childWidget->isVisibleTo( &testWidget ) );

    QWidget* grandChildWidget = new QWidget( childWidget );
    QVERIFY( !grandChildWidget->isVisibleTo( &testWidget ) );
    QVERIFY( grandChildWidget->isVisibleTo( childWidget ) );

    testWidget.show();
    childWidget->show();

    QVERIFY( childWidget->isVisibleTo( &testWidget ) );
    grandChildWidget->hide();
    QVERIFY( !grandChildWidget->isVisibleTo( childWidget ) );
    QVERIFY( !grandChildWidget->isVisibleTo( &testWidget ) );
}

void tst_QWidget::isHidden()
{
    // Ensure that the testWidget is hidden for this test at the
    // start
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());

    QVERIFY( testWidget->isHidden() );
    QWidget* childWidget = new QWidget( testWidget.data() );
    QVERIFY( !childWidget->isHidden() );

    testWidget->show();
    QVERIFY( !testWidget->isHidden() );
    QVERIFY( !childWidget->isHidden() );

    QWidget* grandChildWidget = new QWidget( childWidget );
    QVERIFY( grandChildWidget->isHidden() );
    grandChildWidget->show();
    QVERIFY( !grandChildWidget->isHidden() );

    grandChildWidget->hide();
    testWidget->hide();
    testWidget->show();
    QVERIFY( grandChildWidget->isHidden() );
    QVERIFY( !testWidget->isHidden() );
    QVERIFY( !childWidget->isHidden() );

    grandChildWidget->show();
    childWidget->hide();
    testWidget->hide();
    testWidget->show();
    QVERIFY( !testWidget->isHidden() );
    QVERIFY( childWidget->isHidden() );
    QVERIFY( !grandChildWidget->isHidden() );

    grandChildWidget->show();
    QVERIFY( !grandChildWidget->isHidden() );
}

void tst_QWidget::fonts()
{
    QWidget testWidget;
    testWidget.resize(m_testWidgetSize);
    testWidget.setWindowTitle(__FUNCTION__);
    centerOnScreen(&testWidget);
    testWidget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&testWidget));

    // Tests setFont(), ownFont() and unsetFont()
    QWidget* cleanTestWidget = new QWidget( &testWidget );
    QFont originalFont = cleanTestWidget->font();

    QVERIFY( !cleanTestWidget->testAttribute(Qt::WA_SetFont) );
    cleanTestWidget->setFont(QFont());
    QVERIFY( !cleanTestWidget->testAttribute(Qt::WA_SetFont) );

    QFont newFont( "times", 18 );
    cleanTestWidget->setFont( newFont );
    newFont = newFont.resolve( testWidget.font() );

    QVERIFY( cleanTestWidget->testAttribute(Qt::WA_SetFont) );
    QVERIFY2( cleanTestWidget->font() == newFont,
              msgComparisonFailed(cleanTestWidget->font(), "==", newFont));

    cleanTestWidget->setFont(QFont());
    QVERIFY( !cleanTestWidget->testAttribute(Qt::WA_SetFont) );
    QVERIFY2( cleanTestWidget->font() == originalFont,
              msgComparisonFailed(cleanTestWidget->font(), "==", originalFont));
}

void tst_QWidget::mapFromAndTo_data()
{
    QTest::addColumn<bool>("windowHidden");
    QTest::addColumn<bool>("subWindow1Hidden");
    QTest::addColumn<bool>("subWindow2Hidden");
    QTest::addColumn<bool>("subSubWindowHidden");
    QTest::addColumn<bool>("windowMinimized");
    QTest::addColumn<bool>("subWindow1Minimized");

    QTest::newRow("window 1 sub1 1 sub2 1 subsub 1") << false << false << false << false << false << false;
    QTest::newRow("window 0 sub1 1 sub2 1 subsub 1") << true << false << false << false << false << false;
    QTest::newRow("window 1 sub1 0 sub2 1 subsub 1") << false << true << false << false << false << false;
    QTest::newRow("window 0 sub1 0 sub2 1 subsub 1") << true << true << false << false << false << false;
    QTest::newRow("window 1 sub1 1 sub2 0 subsub 1") << false << false << true << false << false << false;
    QTest::newRow("window 0 sub1 1 sub2 0 subsub 1") << true << false << true << false << false << false;
    QTest::newRow("window 1 sub1 0 sub2 0 subsub 1") << false << true << true << false << false << false;
    QTest::newRow("window 0 sub1 0 sub2 0 subsub 1") << true << true << true << false << false << false;
    QTest::newRow("window 1 sub1 1 sub2 1 subsub 0") << false << false << false << true << false << false;
    QTest::newRow("window 0 sub1 1 sub2 1 subsub 0") << true << false << false << true << false << false;
    QTest::newRow("window 1 sub1 0 sub2 1 subsub 0") << false << true << false << true << false << false;
    QTest::newRow("window 0 sub1 0 sub2 1 subsub 0") << true << true << false << true << false << false;
    QTest::newRow("window 1 sub1 1 sub2 0 subsub 0") << false << false << true << true << false << false;
    QTest::newRow("window 0 sub1 1 sub2 0 subsub 0") << true << false << true << true << false << false;
    QTest::newRow("window 1 sub1 0 sub2 0 subsub 0") << false << true << true << true << false << false;
    QTest::newRow("window 0 sub1 0 sub2 0 subsub 0") << true << true << true << true << false << false;
    QTest::newRow("window 1 sub1 1 sub2 1 subsub 1 windowMinimized") << false << false << false << false << true << false;
    QTest::newRow("window 0 sub1 1 sub2 1 subsub 1 windowMinimized") << true << false << false << false << true << false;
    QTest::newRow("window 1 sub1 0 sub2 1 subsub 1 windowMinimized") << false << true << false << false << true << false;
    QTest::newRow("window 0 sub1 0 sub2 1 subsub 1 windowMinimized") << true << true << false << false << true << false;
    QTest::newRow("window 1 sub1 1 sub2 0 subsub 1 windowMinimized") << false << false << true << false << true << false;
    QTest::newRow("window 0 sub1 1 sub2 0 subsub 1 windowMinimized") << true << false << true << false << true << false;
    QTest::newRow("window 1 sub1 0 sub2 0 subsub 1 windowMinimized") << false << true << true << false << true << false;
    QTest::newRow("window 0 sub1 0 sub2 0 subsub 1 windowMinimized") << true << true << true << false << true << false;
    QTest::newRow("window 1 sub1 1 sub2 1 subsub 0 windowMinimized") << false << false << false << true << true << false;
    QTest::newRow("window 0 sub1 1 sub2 1 subsub 0 windowMinimized") << true << false << false << true << true << false;
    QTest::newRow("window 1 sub1 0 sub2 1 subsub 0 windowMinimized") << false << true << false << true << true << false;
    QTest::newRow("window 0 sub1 0 sub2 1 subsub 0 windowMinimized") << true << true << false << true << true << false;
    QTest::newRow("window 1 sub1 1 sub2 0 subsub 0 windowMinimized") << false << false << true << true << true << false;
    QTest::newRow("window 0 sub1 1 sub2 0 subsub 0 windowMinimized") << true << false << true << true << true << false;
    QTest::newRow("window 1 sub1 0 sub2 0 subsub 0 windowMinimized") << false << true << true << true << true << false;
    QTest::newRow("window 0 sub1 0 sub2 0 subsub 0 windowMinimized") << true << true << true << true << true << false;
    QTest::newRow("window 1 sub1 1 sub2 1 subsub 1 subWindow1Minimized") << false << false << false << false << false << true;
    QTest::newRow("window 0 sub1 1 sub2 1 subsub 1 subWindow1Minimized") << true << false << false << false << false << true;
    QTest::newRow("window 1 sub1 0 sub2 1 subsub 1 subWindow1Minimized") << false << true << false << false << false << true;
    QTest::newRow("window 0 sub1 0 sub2 1 subsub 1 subWindow1Minimized") << true << true << false << false << false << true;
    QTest::newRow("window 1 sub1 1 sub2 0 subsub 1 subWindow1Minimized") << false << false << true << false << false << true;
    QTest::newRow("window 0 sub1 1 sub2 0 subsub 1 subWindow1Minimized") << true << false << true << false << false << true;
    QTest::newRow("window 1 sub1 0 sub2 0 subsub 1 subWindow1Minimized") << false << true << true << false << false << true;
    QTest::newRow("window 0 sub1 0 sub2 0 subsub 1 subWindow1Minimized") << true << true << true << false << false << true;
    QTest::newRow("window 1 sub1 1 sub2 1 subsub 0 subWindow1Minimized") << false << false << false << true << false << true;
    QTest::newRow("window 0 sub1 1 sub2 1 subsub 0 subWindow1Minimized") << true << false << false << true << false << true;
    QTest::newRow("window 1 sub1 0 sub2 1 subsub 0 subWindow1Minimized") << false << true << false << true << false << true;
    QTest::newRow("window 0 sub1 0 sub2 1 subsub 0 subWindow1Minimized") << true << true << false << true << false << true;
    QTest::newRow("window 1 sub1 1 sub2 0 subsub 0 subWindow1Minimized") << false << false << true << true << false << true;
    QTest::newRow("window 0 sub1 1 sub2 0 subsub 0 subWindow1Minimized") << true << false << true << true << false << true;
    QTest::newRow("window 1 sub1 0 sub2 0 subsub 0 subWindow1Minimized") << false << true << true << true << false << true;
    QTest::newRow("window 0 sub1 0 sub2 0 subsub 0 subWindow1Minimized") << true << true << true << true << false << true;


}

void tst_QWidget::mapFromAndTo()
{
    QFETCH(bool, windowHidden);
    QFETCH(bool, subWindow1Hidden);
    QFETCH(bool, subWindow2Hidden);
    QFETCH(bool, subSubWindowHidden);
    QFETCH(bool, windowMinimized);
    QFETCH(bool, subWindow1Minimized);

    // create a toplevel and two overlapping siblings
    QWidget window;
    window.setObjectName(QStringLiteral("mapFromAndTo"));
    window.setWindowTitle(window.objectName());
    window.setWindowFlags(window.windowFlags() | Qt::X11BypassWindowManagerHint);
    QWidget *subWindow1 = new QWidget(&window);
    QWidget *subWindow2 = new QWidget(&window);
    QWidget *subSubWindow = new QWidget(subWindow1);

    // set their geometries
    window.setGeometry(100, 100, 100, 100);
    subWindow1->setGeometry(50, 50, 100, 100);
    subWindow2->setGeometry(75, 75, 100, 100);
    subSubWindow->setGeometry(10, 10, 10, 10);

#if !defined(Q_OS_QNX)
    //update visibility
    if (windowMinimized) {
        if (!windowHidden) {
            window.showMinimized();
            QVERIFY(window.isMinimized());
        }
    } else {
        window.setVisible(!windowHidden);
    }
    if (subWindow1Minimized) {
        subWindow1->hide();
        subWindow1->showMinimized();
        QVERIFY(subWindow1->isMinimized());
    } else {
        subWindow1->setVisible(!subWindow1Hidden);
    }
#else
    Q_UNUSED(windowHidden);
    Q_UNUSED(subWindow1Hidden);
    Q_UNUSED(windowMinimized);
    Q_UNUSED(subWindow1Minimized);
#endif

    subWindow2->setVisible(!subWindow2Hidden);
    subSubWindow->setVisible(!subSubWindowHidden);

    // window
    QCOMPARE(window.mapToGlobal(QPoint(0, 0)), QPoint(100, 100));
    QCOMPARE(window.mapToGlobal(QPoint(10, 0)), QPoint(110, 100));
    QCOMPARE(window.mapToGlobal(QPoint(0, 10)), QPoint(100, 110));
    QCOMPARE(window.mapToGlobal(QPoint(-10, 0)), QPoint(90, 100));
    QCOMPARE(window.mapToGlobal(QPoint(0, -10)), QPoint(100, 90));
    QCOMPARE(window.mapToGlobal(QPoint(100, 100)), QPoint(200, 200));
    auto delta = window.mapToGlobal(QPointF(100.5, 100.5)) - QPointF(200.5, 200.5);
    QVERIFY(qFuzzyIsNull(delta.manhattanLength()));
    QCOMPARE(window.mapToGlobal(QPoint(110, 100)), QPoint(210, 200));
    QCOMPARE(window.mapToGlobal(QPoint(100, 110)), QPoint(200, 210));
    QCOMPARE(window.mapFromGlobal(QPoint(100, 100)), QPoint(0, 0));
    QCOMPARE(window.mapFromGlobal(QPoint(110, 100)), QPoint(10, 0));
    QCOMPARE(window.mapFromGlobal(QPoint(100, 110)), QPoint(0, 10));
    QCOMPARE(window.mapFromGlobal(QPoint(90, 100)), QPoint(-10, 0));
    QCOMPARE(window.mapFromGlobal(QPoint(100, 90)), QPoint(0, -10));
    QCOMPARE(window.mapFromGlobal(QPoint(200, 200)), QPoint(100, 100));
    delta = window.mapFromGlobal(QPointF(200.5, 200.5)) - QPointF(100.5, 100.5);
    QVERIFY(qFuzzyIsNull(delta.manhattanLength()));
    QCOMPARE(window.mapFromGlobal(QPoint(210, 200)), QPoint(110, 100));
    QCOMPARE(window.mapFromGlobal(QPoint(200, 210)), QPoint(100, 110));
    QCOMPARE(window.mapToParent(QPoint(0, 0)), QPoint(100, 100));
    QCOMPARE(window.mapToParent(QPoint(10, 0)), QPoint(110, 100));
    QCOMPARE(window.mapToParent(QPoint(0, 10)), QPoint(100, 110));
    QCOMPARE(window.mapToParent(QPoint(-10, 0)), QPoint(90, 100));
    QCOMPARE(window.mapToParent(QPoint(0, -10)), QPoint(100, 90));
    QCOMPARE(window.mapToParent(QPoint(100, 100)), QPoint(200, 200));
    QCOMPARE(window.mapToParent(QPoint(110, 100)), QPoint(210, 200));
    QCOMPARE(window.mapToParent(QPoint(100, 110)), QPoint(200, 210));
    QCOMPARE(window.mapFromParent(QPoint(100, 100)), QPoint(0, 0));
    QCOMPARE(window.mapFromParent(QPoint(110, 100)), QPoint(10, 0));
    QCOMPARE(window.mapFromParent(QPoint(100, 110)), QPoint(0, 10));
    QCOMPARE(window.mapFromParent(QPoint(90, 100)), QPoint(-10, 0));
    QCOMPARE(window.mapFromParent(QPoint(100, 90)), QPoint(0, -10));
    QCOMPARE(window.mapFromParent(QPoint(200, 200)), QPoint(100, 100));
    QCOMPARE(window.mapFromParent(QPoint(210, 200)), QPoint(110, 100));
    QCOMPARE(window.mapFromParent(QPoint(200, 210)), QPoint(100, 110));

    // first subwindow
    QCOMPARE(subWindow1->mapToGlobal(QPoint(0, 0)), QPoint(150, 150));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(10, 0)), QPoint(160, 150));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(0, 10)), QPoint(150, 160));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(-10, 0)), QPoint(140, 150));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(0, -10)), QPoint(150, 140));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(100, 100)), QPoint(250, 250));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(110, 100)), QPoint(260, 250));
    QCOMPARE(subWindow1->mapToGlobal(QPoint(100, 110)), QPoint(250, 260));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(150, 150)), QPoint(0, 0));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(160, 150)), QPoint(10, 0));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(150, 160)), QPoint(0, 10));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(140, 150)), QPoint(-10, 0));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(150, 140)), QPoint(0, -10));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(250, 250)), QPoint(100, 100));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(260, 250)), QPoint(110, 100));
    QCOMPARE(subWindow1->mapFromGlobal(QPoint(250, 260)), QPoint(100, 110));
    QCOMPARE(subWindow1->mapToParent(QPoint(0, 0)), QPoint(50, 50));
    QCOMPARE(subWindow1->mapToParent(QPoint(10, 0)), QPoint(60, 50));
    QCOMPARE(subWindow1->mapToParent(QPoint(0, 10)), QPoint(50, 60));
    QCOMPARE(subWindow1->mapToParent(QPoint(-10, 0)), QPoint(40, 50));
    QCOMPARE(subWindow1->mapToParent(QPoint(0, -10)), QPoint(50, 40));
    QCOMPARE(subWindow1->mapToParent(QPoint(100, 100)), QPoint(150, 150));
    QCOMPARE(subWindow1->mapToParent(QPoint(110, 100)), QPoint(160, 150));
    QCOMPARE(subWindow1->mapToParent(QPoint(100, 110)), QPoint(150, 160));
    QCOMPARE(subWindow1->mapFromParent(QPoint(50, 50)), QPoint(0, 0));
    QCOMPARE(subWindow1->mapFromParent(QPoint(60, 50)), QPoint(10, 0));
    QCOMPARE(subWindow1->mapFromParent(QPoint(50, 60)), QPoint(0, 10));
    QCOMPARE(subWindow1->mapFromParent(QPoint(40, 50)), QPoint(-10, 0));
    QCOMPARE(subWindow1->mapFromParent(QPoint(50, 40)), QPoint(0, -10));
    QCOMPARE(subWindow1->mapFromParent(QPoint(150, 150)), QPoint(100, 100));
    QCOMPARE(subWindow1->mapFromParent(QPoint(160, 150)), QPoint(110, 100));
    QCOMPARE(subWindow1->mapFromParent(QPoint(150, 160)), QPoint(100, 110));

    // subsubwindow
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(0, 0)), QPoint(160, 160));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(10, 0)), QPoint(170, 160));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(0, 10)), QPoint(160, 170));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(-10, 0)), QPoint(150, 160));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(0, -10)), QPoint(160, 150));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(100, 100)), QPoint(260, 260));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(110, 100)), QPoint(270, 260));
    QCOMPARE(subSubWindow->mapToGlobal(QPoint(100, 110)), QPoint(260, 270));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(160, 160)), QPoint(0, 0));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(170, 160)), QPoint(10, 0));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(160, 170)), QPoint(0, 10));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(150, 160)), QPoint(-10, 0));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(160, 150)), QPoint(0, -10));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(260, 260)), QPoint(100, 100));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(270, 260)), QPoint(110, 100));
    QCOMPARE(subSubWindow->mapFromGlobal(QPoint(260, 270)), QPoint(100, 110));
    QCOMPARE(subSubWindow->mapToParent(QPoint(0, 0)), QPoint(10, 10));
    QCOMPARE(subSubWindow->mapToParent(QPoint(10, 0)), QPoint(20, 10));
    QCOMPARE(subSubWindow->mapToParent(QPoint(0, 10)), QPoint(10, 20));
    QCOMPARE(subSubWindow->mapToParent(QPoint(-10, 0)), QPoint(0, 10));
    QCOMPARE(subSubWindow->mapToParent(QPoint(0, -10)), QPoint(10, 0));
    QCOMPARE(subSubWindow->mapToParent(QPoint(100, 100)), QPoint(110, 110));
    QCOMPARE(subSubWindow->mapToParent(QPoint(110, 100)), QPoint(120, 110));
    QCOMPARE(subSubWindow->mapToParent(QPoint(100, 110)), QPoint(110, 120));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(10, 10)), QPoint(0, 0));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(20, 10)), QPoint(10, 0));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(10, 20)), QPoint(0, 10));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(0, 10)), QPoint(-10, 0));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(10, 0)), QPoint(0, -10));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(110, 110)), QPoint(100, 100));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(120, 110)), QPoint(110, 100));
    QCOMPARE(subSubWindow->mapFromParent(QPoint(110, 120)), QPoint(100, 110));
}

void tst_QWidget::focusChainOnReparent()
{
    QWidget window;
    QWidget *child1 = new QWidget(&window);
    QWidget *child2 = new QWidget(&window);
    QWidget *child3 = new QWidget(&window);
    QWidget *child21 = new QWidget(child2);
    QWidget *child22 = new QWidget(child2);
    QWidget *child4 = new QWidget(&window);

    QWidget *expectedOriginalChain[8] = {&window, child1,  child2,  child3,  child21, child22, child4, &window};
    QWidget *w = &window;
    for (auto expectedOriginal : expectedOriginalChain) {
        QCOMPARE(w, expectedOriginal);
        w = w->nextInFocusChain();
    }
    for (int i = 7; i >= 0; --i) {
        w = w->previousInFocusChain();
        QCOMPARE(w, expectedOriginalChain[i]);
    }

    QWidget window2;
    child2->setParent(&window2);

    QWidget *expectedNewChain[5] = {&window2, child2,  child21, child22, &window2};
    w = &window2;
    for (auto expectedNew : expectedNewChain) {
        QCOMPARE(w, expectedNew);
        w = w->nextInFocusChain();
    }
    for (int i = 4; i >= 0; --i) {
        w = w->previousInFocusChain();
        QCOMPARE(w, expectedNewChain[i]);
    }

    QWidget *expectedOldChain[5] = {&window, child1,  child3, child4, &window};
    w = &window;
    for (auto expectedOld : expectedOldChain) {
        QCOMPARE(w, expectedOld);
        w = w->nextInFocusChain();
    }
    for (int i = 4; i >= 0; --i) {
        w = w->previousInFocusChain();
        QCOMPARE(w, expectedOldChain[i]);
    }
}


void tst_QWidget::focusChainOnHide()
{
    // focus should move to the next widget in the focus chain when we hide it.
    QScopedPointer<QWidget> parent(new QWidget());
    parent->setObjectName(QLatin1String("focusChainOnHide"));
    parent->resize(200, 200);
    parent->setWindowTitle(parent->objectName());
    parent->setFocusPolicy(Qt::StrongFocus);
    QWidget *child = new QWidget(parent.data());
    child->setObjectName(QLatin1String("child"));
    child->setFocusPolicy(Qt::StrongFocus);
    QWidget::setTabOrder(child, parent.data());

    parent->show();
    QApplicationPrivate::setActiveWindow(parent->window());
    child->activateWindow();
    child->setFocus();

    QTRY_VERIFY(child->hasFocus());
    child->hide();

    QTRY_VERIFY(parent->hasFocus());
    QCOMPARE(parent.data(), QApplication::focusWidget());
}

class Container : public QWidget
{
public:
    QVBoxLayout* box;

    Container()
    {
        box = new QVBoxLayout(this);
        //(new QVBoxLayout(this))->setAutoAdd(true);
    }

    void tab()
    {
        focusNextPrevChild(true);
    }

    void backTab()
    {
        focusNextPrevChild(false);
    }
};

class Composite : public QFrame
{
public:
    explicit Composite(QWidget *parent = nullptr, const QString &name = QString())
        : QFrame(parent)
    {
        setObjectName(name);

        lineEdit1 = new QLineEdit;
        lineEdit1->setObjectName(name + "/lineEdit1");
        lineEdit2 = new QLineEdit;
        lineEdit2->setObjectName(name + "/lineEdit2");
        lineEdit3 = new QLineEdit;
        lineEdit3->setObjectName(name + "/lineEdit3");
        lineEdit3->setEnabled(false);

        QHBoxLayout* hbox = new QHBoxLayout(this);
        hbox->addWidget(lineEdit1);
        hbox->addWidget(lineEdit2);
        hbox->addWidget(lineEdit3);
    }

public:
    QLineEdit *lineEdit1;
    QLineEdit *lineEdit2;
    QLineEdit *lineEdit3;
};

static QList<QWidget *> getFocusChain(QWidget *start, bool bForward)
{
    QList<QWidget *> ret;
    QWidget *cur = start;
    // detect infinite loop
    int count = 100;
    auto loopGuard = qScopeGuard([]{
        QFAIL("Inifinite loop detected in focus chain");
    });
    do {
        ret += cur;
        auto widgetPrivate = static_cast<QWidgetPrivate *>(qt_widget_private(cur));
        cur = bForward ? widgetPrivate->focus_next : widgetPrivate->focus_prev;
        if (!--count)
            return ret;
    } while (cur != start);
    loopGuard.dismiss();
    return ret;
}

void tst_QWidget::defaultTabOrder()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    const int compositeCount = 2;
    Container container;
    Composite *composite[compositeCount];

    QLineEdit *firstEdit = new QLineEdit;
    container.box->addWidget(firstEdit);

    for (int i = 0; i < compositeCount; i++) {
        composite[i] = new Composite();
        container.box->addWidget(composite[i]);
    }

    QLineEdit *lastEdit = new QLineEdit();
    container.box->addWidget(lastEdit);

    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    container.show();
    container.activateWindow();
    QApplicationPrivate::setActiveWindow(&container);
    QVERIFY(QTest::qWaitForWindowActive(&container));

    QTRY_VERIFY(firstEdit->hasFocus());

    // Check that focus moves between the line edits when we tab forward
    for (int i = 0; i < compositeCount; ++i) {
        container.tab();
        QVERIFY(composite[i]->lineEdit1->hasFocus());
        QVERIFY(!composite[i]->lineEdit2->hasFocus());
        container.tab();
        QVERIFY(!composite[i]->lineEdit1->hasFocus());
        QVERIFY(composite[i]->lineEdit2->hasFocus());
    }

    container.tab();
    QVERIFY(lastEdit->hasFocus());

    // Check that focus moves between the line edits in reverse
    // order when we tab backwards
    for (int i = compositeCount - 1; i >= 0; --i) {
        container.backTab();
        QVERIFY(!composite[i]->lineEdit1->hasFocus());
        QVERIFY(composite[i]->lineEdit2->hasFocus());

        container.backTab();
        QVERIFY(composite[i]->lineEdit1->hasFocus());
        QVERIFY(!composite[i]->lineEdit2->hasFocus());
    }

    container.backTab();
    QVERIFY(firstEdit->hasFocus());
}

void tst_QWidget::reverseTabOrder()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    const int compositeCount = 2;
    Container container;
    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    Composite* composite[compositeCount];

    QLineEdit *firstEdit = new QLineEdit();
    container.box->addWidget(firstEdit);

    for (int i = 0; i < compositeCount; i++) {
        composite[i] = new Composite();
        container.box->addWidget(composite[i]);
    }

    QLineEdit *lastEdit = new QLineEdit();
    container.box->addWidget(lastEdit);

    // Reverse tab order inside each composite
    for (int i = 0; i < compositeCount; ++i)
        QWidget::setTabOrder(composite[i]->lineEdit2, composite[i]->lineEdit1);

    container.show();
    container.activateWindow();
    QApplicationPrivate::setActiveWindow(&container);
    QVERIFY(QTest::qWaitForWindowActive(&container));

    QTRY_VERIFY(firstEdit->hasFocus());

    // Check that focus moves in reverse order when tabbing inside the composites
    // (but in the correct order when tabbing between them)
    for (int i = 0; i < compositeCount; ++i) {
        container.tab();
        QVERIFY(!composite[i]->lineEdit1->hasFocus());
        QVERIFY(composite[i]->lineEdit2->hasFocus());
        container.tab();
        QVERIFY(composite[i]->lineEdit1->hasFocus());
        QVERIFY(!composite[i]->lineEdit2->hasFocus());
    }

    container.tab();
    QVERIFY(lastEdit->hasFocus());

    // Check that focus moves in "normal" order when tabbing backwards inside the
    // composites (since backwards of reversed order cancels each other out),
    // but in the reverse order when tabbing between them.
    for (int i = compositeCount - 1; i >= 0; --i) {
        container.backTab();
        QVERIFY(composite[i]->lineEdit1->hasFocus());
        QVERIFY(!composite[i]->lineEdit2->hasFocus());
        container.backTab();
        QVERIFY(!composite[i]->lineEdit1->hasFocus());
        QVERIFY(composite[i]->lineEdit2->hasFocus());
    }

    container.backTab();
    QVERIFY(firstEdit->hasFocus());
}

void tst_QWidget::tabOrderList()
{
    Composite c;
    QCOMPARE(getFocusChain(&c, true),
             QList<QWidget *>({&c, c.lineEdit1, c.lineEdit2, c.lineEdit3}));
    QWidget::setTabOrder({c.lineEdit3, c.lineEdit2, c.lineEdit1});
    // not starting with 3 like one would maybe expect, but still 3, 2, 1
    QCOMPARE(getFocusChain(&c, true),
             QList<QWidget *>({&c, c.lineEdit1, c.lineEdit3, c.lineEdit2}));
}

void tst_QWidget::tabOrderComboBox_data()
{
    QTest::addColumn<const bool>("editableAtBeginning");
    QTest::addColumn<const QList<int>>("firstTabOrder");
    QTest::addColumn<const QList<int>>("secondTabOrder");

    QTest::addRow("3 not editable") << false << QList<int>{2, 1, 0} << QList<int>{0, 1, 2};
    QTest::addRow("4 editable") << true << QList<int>{2, 1, 0, 3} << QList<int>{3, 0, 2, 1};
}

QWidgetList expectedFocusChain(const QList<QComboBox *> &boxes, const QList<int> &sequence)
{
    Q_ASSERT(boxes.count() == sequence.count());
    QWidgetList widgets;
    for (int i : sequence) {
        Q_ASSERT(i >= 0);
        Q_ASSERT(i < boxes.count());
        QComboBox *box = boxes.at(i);
        widgets.append(box);
        if (box->lineEdit())
            widgets.append(box->lineEdit());
    }

    return widgets;
}

QWidgetList realFocusChain(const QList<QComboBox *> &boxes, const QList<int> &sequence)
{
    const QWidgetList all = getFocusChain(boxes.at(sequence.at(0)), true);
    QWidgetList chain;
    // Filter everything with NoFocus
    for (auto *widget : all) {
        if (widget->focusPolicy() != Qt::NoFocus)
            chain << widget;
    }
    return chain;
}

void setTabOrder(const QList<QComboBox *> &boxes, const QList<int> &sequence)
{
    Q_ASSERT(boxes.count() == sequence.count());
    QWidget *previous = nullptr;
    for (int i : sequence) {
        Q_ASSERT(i >= 0);
        Q_ASSERT(i < boxes.count());
        QWidget *box = boxes.at(i);
        if (!previous) {
            previous = box;
        } else {
            QWidget::setTabOrder(previous, box);
            previous = box;
        }
    }
}

void tst_QWidget::tabOrderComboBox()
{
    QFETCH(const bool, editableAtBeginning);
    QFETCH(const QList<int>, firstTabOrder);
    QFETCH(const QList<int>, secondTabOrder);
    const int count = firstTabOrder.count();
    Q_ASSERT(count == secondTabOrder.count());
    Q_ASSERT(count > 1);

    QWidget w;
    w.setObjectName("MainWidget");
    QVBoxLayout* layout = new QVBoxLayout();
    w.setLayout(layout);

    QList<QComboBox *> boxes;
    for (int i = 0; i < count; ++i) {
        auto box = new QComboBox;
        box->setObjectName("ComboBox " + QString::number(i));
        if (editableAtBeginning) {
            box->setEditable(true);
            box->lineEdit()->setObjectName("LineEdit " + QString::number(i));
        }
        boxes.append(box);
        layout->addWidget(box);
    }
    layout->addStretch();

#define COMPARE(seq)\
    setTabOrder(boxes, seq);\
    QCOMPARE(realFocusChain(boxes, seq), expectedFocusChain(boxes, seq))

    COMPARE(firstTabOrder);

    if (!editableAtBeginning) {
        for (auto *box : boxes)
            box->setEditable(box);
    }

    COMPARE(secondTabOrder);

    // Remove the focus proxy of the first combobox's line edit.
    QComboBox *box = boxes.at(0);
    QLineEdit *lineEdit = box->lineEdit();
    QWidgetPrivate *lePriv = QWidgetPrivate::get(lineEdit);
    const QWidget *prev = lePriv->focus_prev;
    const QWidget *next = lePriv->focus_next;
    const QWidget *proxy = lePriv->extra->focus_proxy;
    QCOMPARE(proxy, box);
    lineEdit->setFocusProxy(nullptr);
    QCOMPARE(lePriv->extra->focus_proxy, nullptr);
    QCOMPARE(lePriv->focus_prev, prev);
    QCOMPARE(lePriv->focus_next, next);

    // Remove first item and check chain consistency
    boxes.removeFirst();
    delete box;

    // Create new list with 0 removed and other indexes updated
    QList<int> thirdTabOrder(secondTabOrder);
    thirdTabOrder.removeIf([](int i){ return i == 0; });
    for (int &i : thirdTabOrder)
        --i;

    COMPARE(thirdTabOrder);

#undef COMPARE
}

void tst_QWidget::tabOrderWithProxy()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    const int compositeCount = 2;
    Container container;
    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    Composite* composite[compositeCount];

    QLineEdit *firstEdit = new QLineEdit();
    container.box->addWidget(firstEdit);

    for (int i = 0; i < compositeCount; i++) {
        composite[i] = new Composite();
        container.box->addWidget(composite[i]);

        // Set second child as focus proxy
        composite[i]->setFocusPolicy(Qt::StrongFocus);
        composite[i]->setFocusProxy(composite[i]->lineEdit2);
    }

    QLineEdit *lastEdit = new QLineEdit();
    container.box->addWidget(lastEdit);

    container.show();
    container.activateWindow();
    QApplicationPrivate::setActiveWindow(&container);
    QVERIFY(QTest::qWaitForWindowActive(&container));

    QTRY_VERIFY(firstEdit->hasFocus());

    // Check that focus moves between the second line edits
    // (the focus proxies) when we tab forward
    for (int i = 0; i < compositeCount; ++i) {
        container.tab();
        QVERIFY(!composite[i]->lineEdit1->hasFocus());
        QVERIFY(composite[i]->lineEdit2->hasFocus());
    }

    container.tab();
    QVERIFY(lastEdit->hasFocus());

    // Check that focus moves between the line edits
    // in reverse order when we tab backwards.
    // Note that in this case, the focus proxies should not
    // be taken into consideration, since they only take
    // effect when tabbing forward
    for (int i = compositeCount - 1; i >= 0; --i) {
        container.backTab();
        QVERIFY(!composite[i]->lineEdit1->hasFocus());
        QVERIFY(composite[i]->lineEdit2->hasFocus());
        container.backTab();
        QVERIFY(composite[i]->lineEdit1->hasFocus());
        QVERIFY(!composite[i]->lineEdit2->hasFocus());
    }

    container.backTab();
    QVERIFY(firstEdit->hasFocus());
}

static QString focusWidgetName()
{
    return QApplication::focusWidget() != nullptr
            ? QApplication::focusWidget()->objectName()
            : QStringLiteral("No focus widget");
}

void tst_QWidget::tabOrderWithProxyDisabled()
{
    Container container;
    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

    QLineEdit lineEdit1;
    lineEdit1.setObjectName("lineEdit1");

    QWidget containingWidget;
    containingWidget.setFocusPolicy(Qt::StrongFocus);
    auto *containingLayout = new QVBoxLayout;
    QLineEdit lineEdit2;
    lineEdit2.setObjectName("lineEdit2");
    QLineEdit lineEdit3;
    lineEdit3.setObjectName("lineEdit3");
    containingLayout->addWidget(&lineEdit2);
    containingLayout->addWidget(&lineEdit3);
    containingWidget.setLayout(containingLayout);
    containingWidget.setFocusProxy(&lineEdit2);
    lineEdit2.setEnabled(false);

    container.box->addWidget(&lineEdit1);
    container.box->addWidget(&containingWidget);

    container.show();
    container.activateWindow();

    QApplicationPrivate::setActiveWindow(&container);
    if (!QTest::qWaitForWindowActive(&container))
        QSKIP("Window failed to activate, skipping test");

    QVERIFY2(lineEdit1.hasFocus(),
             qPrintable(focusWidgetName()));
    container.tab();
    QVERIFY2(!lineEdit2.hasFocus(),
             qPrintable(focusWidgetName()));
    QVERIFY2(lineEdit3.hasFocus(),
             qPrintable(focusWidgetName()));
    container.tab();
    QVERIFY2(lineEdit1.hasFocus(),
             qPrintable(focusWidgetName()));
    container.backTab();
    QVERIFY2(lineEdit3.hasFocus(),
             qPrintable(focusWidgetName()));
    container.backTab();
    QVERIFY2(!lineEdit2.hasFocus(),
             qPrintable(focusWidgetName()));
    QVERIFY2(lineEdit1.hasFocus(),
             qPrintable(focusWidgetName()));
}

//#define DEBUG_FOCUS_CHAIN
static void dumpFocusChain(QWidget *start, bool bForward, const char *desc = nullptr)
{
#ifdef DEBUG_FOCUS_CHAIN
    qDebug() << "Dump focus chain, start:" << start << "isForward:" << bForward << desc;
    QWidget *cur = start;
    do {
        qDebug() << "-" << cur;
        auto widgetPrivate = static_cast<QWidgetPrivate *>(qt_widget_private(cur));
        cur = bForward ? widgetPrivate->focus_next : widgetPrivate->focus_prev;
    } while (cur != start);
#else
    Q_UNUSED(start);
    Q_UNUSED(bForward);
    Q_UNUSED(desc);
#endif
}

void tst_QWidget::tabOrderWithCompoundWidgets()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    const int compositeCount = 4;
    Container container;
    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    Composite *composite[compositeCount];

    QLineEdit *firstEdit = new QLineEdit();
    container.box->addWidget(firstEdit);

    for (int i = 0; i < compositeCount; i++) {
        composite[i] = new Composite(nullptr, QStringLiteral("Composite: ") + QString::number(i));
        container.box->addWidget(composite[i]);

        // Let the composite handle focus, and set a child as focus proxy (use the second child, just
        // to ensure that we don't just tab to the first child by coinsidence). This will make the
        // composite "compound". Also enable the last line edit to have a bit more data to check when
        // tabbing forwards.
        composite[i]->setFocusPolicy(Qt::StrongFocus);
        composite[i]->setFocusProxy(composite[i]->lineEdit2);
        composite[i]->lineEdit3->setEnabled(true);
    }

    QLineEdit *lastEdit = new QLineEdit();
    container.box->addWidget(lastEdit);

    // Reverse tab order between each composite
    // (but not inside them), including first and last line edit.
    // The result should not affect local tab order inside each
    // composite, only between them.
    QWidget::setTabOrder(lastEdit, composite[compositeCount - 1]);
    for (int i = compositeCount - 1; i >= 1; --i)
        QWidget::setTabOrder(composite[i], composite[i-1]);
    QWidget::setTabOrder(composite[0], firstEdit);

    container.show();
    container.activateWindow();
    QApplicationPrivate::setActiveWindow(&container);
    QVERIFY(QTest::qWaitForWindowActive(&container));

    lastEdit->setFocus();
    QTRY_VERIFY(lastEdit->hasFocus());

    // Check that focus moves between the line edits in the normal
    // order when tabbing inside each compound, but in the reverse
    // order when tabbing between them. Since the composites have
    // lineEdit2 as focus proxy, lineEdit2 will be the first with focus
    // when the compound gets focus, and lineEdit1 will therefore be skipped.
    for (int i = compositeCount - 1; i >= 0; --i) {
        container.tab();
        Composite *c = composite[i];
        QVERIFY(!c->lineEdit1->hasFocus());
        QVERIFY(c->lineEdit2->hasFocus());
        QVERIFY(!c->lineEdit3->hasFocus());
        container.tab();
        QVERIFY(!c->lineEdit1->hasFocus());
        QVERIFY(!c->lineEdit2->hasFocus());
        QVERIFY(c->lineEdit3->hasFocus());
    }

    container.tab();
    QVERIFY(firstEdit->hasFocus());

    // Check that focus moves in reverse order when backTab inside the composites, but
    // in the 'correct' order when backTab between them (since the composites are in reverse tab
    // order from before, which cancels it out). Note that when we backtab into a compound, we start
    // at lineEdit3 rather than the focus proxy, since that is the reverse of what happens when we tab
    // forward. And this time we will also backtab to lineEdit1, since there is no focus proxy that interferes.
    for (int i = 0; i < compositeCount; ++i) {
        container.backTab();
        Composite *c = composite[i];
        QVERIFY(!c->lineEdit1->hasFocus());
        QVERIFY(!c->lineEdit2->hasFocus());
        QVERIFY(c->lineEdit3->hasFocus());
        container.backTab();
        QVERIFY(!c->lineEdit1->hasFocus());
        QVERIFY(c->lineEdit2->hasFocus());
        QVERIFY(!c->lineEdit3->hasFocus());
        container.backTab();
        QVERIFY(c->lineEdit1->hasFocus());
        QVERIFY(!c->lineEdit2->hasFocus());
        QVERIFY(!c->lineEdit3->hasFocus());
    }

    container.backTab();
    QVERIFY(lastEdit->hasFocus());
}

void tst_QWidget::tabOrderWithProxyOutOfOrder()
{
    Container container;
    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

    // important to create the widgets with parent so that they are
    // added to the focus chain already now, and with the buttonBox
    // before the outsideButton.
    QWidget buttonBox(&container);
    buttonBox.setObjectName("buttonBox");
    QPushButton outsideButton(&container);
    outsideButton.setObjectName("outsideButton");

    container.box->addWidget(&outsideButton);
    container.box->addWidget(&buttonBox);
    QCOMPARE(getFocusChain(&container, true),
             QList<QWidget*>({&container, &buttonBox, &outsideButton}));

    // this now adds okButon and cancelButton to the focus chain,
    // after the outsideButton - so the outsideButton is in between
    // the buttonBox and the children of the buttonBox!
    QPushButton okButton(&buttonBox);
    okButton.setObjectName("okButton");
    QPushButton cancelButton(&buttonBox);
    cancelButton.setObjectName("cancelButton");
    QCOMPARE(getFocusChain(&container, true),
             QList<QWidget*>({&container, &buttonBox, &outsideButton, &okButton, &cancelButton}));

    // by setting the okButton as the focusProxy, the outsideButton becomes
    // unreachable when navigating the focus chain as the buttonBox is in front
    // of, and proxies to the okButton behind the outsideButton. setFocusProxy
    // must fix that by moving the buttonBox in front of the first sibling of
    // the proxy.
    buttonBox.setFocusProxy(&okButton);
    QCOMPARE(getFocusChain(&container, true),
             QList<QWidget*>({&container, &outsideButton, &buttonBox, &okButton, &cancelButton}));

    container.show();
    container.activateWindow();
    QApplicationPrivate::setActiveWindow(&container);
    if (!QTest::qWaitForWindowActive(&container))
        QSKIP("Window failed to activate, skipping test");

    QCOMPARE(QApplication::focusWidget(), &outsideButton);
    container.tab();
    QCOMPARE(QApplication::focusWidget(), &okButton);
    container.tab();
    QCOMPARE(QApplication::focusWidget(), &cancelButton);
    container.tab();
    QCOMPARE(QApplication::focusWidget(), &outsideButton);

    container.backTab();
    QCOMPARE(QApplication::focusWidget(), &cancelButton);
    container.backTab();
    QCOMPARE(QApplication::focusWidget(), &okButton);
    container.backTab();
    QCOMPARE(QApplication::focusWidget(), &outsideButton);
    container.backTab();
    QCOMPARE(QApplication::focusWidget(), &cancelButton);
}

static bool isFocusChainConsistent(QWidget *widget)
{
    auto forward = getFocusChain(widget, true);
    auto backward = getFocusChain(widget, false);
    auto logger = qScopeGuard([=]{
        qCritical("Focus chain is not consistent!");
        qWarning() << forward.size() << "forwards: " << forward;
        qWarning() << backward.size() << "backwards:" << backward;
    });
    // both lists start with the same, the widget
    if (forward.takeFirst() != backward.takeFirst())
        return false;
    const qsizetype chainLength = forward.size();
    if (backward.size() != chainLength)
        return false;
    for (qsizetype i = 0; i < chainLength; ++i) {
        if (forward.at(i) != backward.at(chainLength - i - 1))
            return false;
    }
    logger.dismiss();
    return true;
}

/*
    This tests that we end up with consistent and complete chains when we set
    the tab order from a widget (the lineEdit) inside a compound (the tabWidget)
    to the compound, or visa versa. In that case, QWidget::setTabOrder will walk
    the focus chain to the focus child inside the compound to replace the compound
    itself when manipulating the tab order. If that last focus child is then
    however also the lineEdit, then we must not create an inconsistent or
    incomplete loop.

    The tabWidget is seen as a compound because QTabWidget sets the tab bar as
    the focus proxy, and it has more widgets inside, like pages, toolbuttons etc.
*/
void tst_QWidget::tabOrderWithCompoundWidgetsInflection_data()
{
    QTest::addColumn<QByteArrayList>("tabOrder");

    QTest::addRow("forward")
        << QByteArrayList{"dialog", "tabWidget", "lineEdit", "compound", "okButton", "cancelButton"};
    QTest::addRow("backward")
        << QByteArrayList{"dialog", "cancelButton", "okButton", "compound", "lineEdit", "tabWidget"};
}

void tst_QWidget::tabOrderWithCompoundWidgetsInflection()
{
    QFETCH(const QByteArrayList, tabOrder);

    QDialog dialog;
    dialog.setObjectName("dialog");
    QTabWidget *tabWidget = new QTabWidget;
    tabWidget->setObjectName("tabWidget");
    tabWidget->setFocusPolicy(Qt::TabFocus);
    QWidget *page = new QWidget;
    page->setObjectName("page");
    QLineEdit *lineEdit = new QLineEdit;
    lineEdit->setObjectName("lineEdit");
    QWidget *compound = new QWidget;
    compound->setObjectName("compound");
    compound->setFocusPolicy(Qt::TabFocus);
    QPushButton *okButton = new QPushButton("Ok");
    okButton->setObjectName("okButton");
    okButton->setFocusPolicy(Qt::TabFocus);
    QPushButton *cancelButton = new QPushButton("Cancel");
    cancelButton->setObjectName("cancelButton");
    cancelButton->setFocusPolicy(Qt::TabFocus);

    QVBoxLayout *pageLayout = new QVBoxLayout;
    pageLayout->addWidget(lineEdit);
    page->setLayout(pageLayout);
    tabWidget->addTab(page, "Tab");

    QHBoxLayout *compoundLayout = new QHBoxLayout;
    compoundLayout->addStretch();
    compoundLayout->addWidget(cancelButton);
    compoundLayout->addWidget(okButton);
    compound->setFocusProxy(okButton);
    compound->setLayout(compoundLayout);

    QVBoxLayout *dialogLayout = new QVBoxLayout;
    dialogLayout->addWidget(tabWidget);
    dialogLayout->addWidget(compound);
    dialog.setLayout(dialogLayout);

    QVERIFY(isFocusChainConsistent(&dialog));

    QList<QWidget *> expectedFocusChain;
    for (qsizetype i = 0; i < tabOrder.size() - 1; ++i) {
        QWidget *first = dialog.findChild<QWidget *>(tabOrder.at(i));
        if (!first && tabOrder.at(i) == dialog.objectName())
            first = &dialog;
        QVERIFY(first);
        if (i == 0)
            expectedFocusChain.append(first);
        QWidget *second = dialog.findChild<QWidget *>(tabOrder.at(i + 1));
        QVERIFY(second);
        expectedFocusChain.append(second);
        QWidget::setTabOrder(first, second);
        QVERIFY(isFocusChainConsistent(&dialog));
    }

    const auto forwardChain = getFocusChain(&dialog, true);
    auto logger = qScopeGuard([=]{
        qCritical("Order of widgets in focus chain not matching:");
        qCritical() << " Actual  :" << forwardChain;
        qCritical() << " Expected:" << expectedFocusChain;
    });
        for (qsizetype i = 0; i < expectedFocusChain.size() - 2; ++i) {
        QCOMPARE_LT(forwardChain.indexOf(expectedFocusChain.at(i)),
                    forwardChain.indexOf(expectedFocusChain.at(i + 1)));
    }
    logger.dismiss();
}

void tst_QWidget::tabOrderWithCompoundWidgetsNoFocusPolicy()
{
    Container container;
    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QSpinBox spinbox1;
    spinbox1.setObjectName("spinbox1");
    QSpinBox spinbox2;
    spinbox2.setObjectName("spinbox2");
    QSpinBox spinbox3;
    spinbox3.setObjectName("spinbox3");

    spinbox1.setFocusPolicy(Qt::StrongFocus);
    spinbox2.setFocusPolicy(Qt::NoFocus);
    spinbox3.setFocusPolicy(Qt::StrongFocus);
    container.box->addWidget(&spinbox1);
    container.box->addWidget(&spinbox2);
    container.box->addWidget(&spinbox3);

    container.show();
    container.activateWindow();

    QApplicationPrivate::setActiveWindow(&container);
    if (!QTest::qWaitForWindowActive(&container))
        QSKIP("Window failed to activate, skipping test");

    QVERIFY2(spinbox1.hasFocus(),
             qPrintable(focusWidgetName()));
    container.tab();
    QVERIFY2(!spinbox2.hasFocus(),
             qPrintable(focusWidgetName()));
    QVERIFY2(spinbox3.hasFocus(),
             qPrintable(focusWidgetName()));
    container.tab();
    QVERIFY2(spinbox1.hasFocus(),
             qPrintable(focusWidgetName()));
    container.backTab();
    QVERIFY2(spinbox3.hasFocus(),
             qPrintable(focusWidgetName()));
    container.backTab();
    QVERIFY2(!spinbox2.hasFocus(),
             qPrintable(focusWidgetName()));
    QVERIFY2(spinbox1.hasFocus(),
             qPrintable(focusWidgetName()));
}

void tst_QWidget::tabOrderNoChange()
{
    QWidget w;
    auto *verticalLayout = new QVBoxLayout(&w);
    auto *tabWidget = new QTabWidget(&w);
    auto *tv = new QTreeView(tabWidget);
    tabWidget->addTab(tv, QStringLiteral("Tab 1"));
    verticalLayout->addWidget(tabWidget);

    const auto focusChainForward = getFocusChain(&w, true);
    const auto focusChainBackward = getFocusChain(&w, false);
    dumpFocusChain(&w, true);
    QWidget::setTabOrder(tabWidget, tv);
    dumpFocusChain(&w, true);
    QCOMPARE(focusChainForward, getFocusChain(&w, true));
    QCOMPARE(focusChainBackward, getFocusChain(&w, false));
}

void tst_QWidget::tabOrderNoChange2()
{
    QWidget w;
    auto *verticalLayout = new QVBoxLayout(&w);
    auto *tabWidget = new QTabWidget(&w);
    tabWidget->setObjectName("tabWidget");
    verticalLayout->addWidget(tabWidget);

    auto *tab1 = new QWidget(tabWidget);
    tab1->setObjectName("tab1");
    auto *vLay1 = new QVBoxLayout(tab1);
    auto *le1 = new QLineEdit(tab1);
    le1->setObjectName("le1");
    auto *le2 = new QLineEdit(tab1);
    le2->setObjectName("le2");
    vLay1->addWidget(le1);
    vLay1->addWidget(le2);
    tabWidget->addTab(tab1, QStringLiteral("Tab 1"));

    auto *tab2 = new QWidget(tabWidget);
    tab2->setObjectName("tab2");
    auto *vLay2 = new QVBoxLayout(tab2);
    auto *le3 = new QLineEdit(tab2);
    le3->setObjectName("le3");
    auto *le4 = new QLineEdit(tab2);
    le4->setObjectName("le4");
    vLay2->addWidget(le3);
    vLay2->addWidget(le4);
    tabWidget->addTab(tab2, QStringLiteral("Tab 2"));

    const auto focusChainForward = getFocusChain(&w, true);
    const auto focusChainBackward = getFocusChain(&w, false);
    dumpFocusChain(&w, true);
    dumpFocusChain(&w, false);
    // this will screw up the focus chain order without visible changes,
    // so don't call it here for the simplicity of the test
    //QWidget::setTabOrder(tabWidget, le1);

    QWidget::setTabOrder(le1, le2);
    dumpFocusChain(&w, true, "QWidget::setTabOrder(le1, le2)");
    QWidget::setTabOrder(le2, le3);
    dumpFocusChain(&w, true, "QWidget::setTabOrder(le2, le3)");
    QWidget::setTabOrder(le3, le4);
    dumpFocusChain(&w, true, "QWidget::setTabOrder(le3, le4)");
    QWidget::setTabOrder(le4, tabWidget);
    dumpFocusChain(&w, true, "QWidget::setTabOrder(le4, tabWidget)");
    dumpFocusChain(&w, false);

    QCOMPARE(focusChainForward, getFocusChain(&w, true));
    QCOMPARE(focusChainBackward, getFocusChain(&w, false));
}

void tst_QWidget::appFocusWidgetWithFocusProxyLater()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    // Given a lineedit without a focus proxy
    QWidget window;
    window.setWindowTitle(QTest::currentTestFunction());
    QLineEdit *lineEditFocusProxy = new QLineEdit(&window);
    QLineEdit *lineEdit = new QLineEdit(&window);
    lineEdit->setFocus();
    window.show();
    QApplicationPrivate::setActiveWindow(&window);
    QVERIFY(QTest::qWaitForWindowActive(&window));
    QCOMPARE(QApplication::focusWidget(), lineEdit);

    // When setting a focus proxy for the focus widget (like QWebEngineView does)
    lineEdit->setFocusProxy(lineEditFocusProxy);

    // Then the focus widget should be updated
    QCOMPARE(QApplication::focusWidget(), lineEditFocusProxy);

    // So that deleting the lineEdit and later the window, doesn't crash
    delete lineEdit;
    QCOMPARE(QApplication::focusWidget(), nullptr);
}

void tst_QWidget::appFocusWidgetWhenLosingFocusProxy()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    // Given a lineedit with a focus proxy
    QWidget window;
    window.setWindowTitle(QTest::currentTestFunction());
    QLineEdit *lineEditFocusProxy = new QLineEdit(&window);
    QLineEdit *lineEdit = new QLineEdit(&window);
    lineEdit->setFocusProxy(lineEditFocusProxy);
    lineEdit->setFocus();
    window.show();
    QApplicationPrivate::setActiveWindow(&window);
    QVERIFY(QTest::qWaitForWindowActive(&window));
    QCOMPARE(QApplication::focusWidget(), lineEditFocusProxy);
    QVERIFY(lineEdit->hasFocus());
    QVERIFY(lineEditFocusProxy->hasFocus());

    // When unsetting the focus proxy
    lineEdit->setFocusProxy(nullptr);

    // then the focus widget should not change
    QCOMPARE(QApplication::focusWidget(), lineEditFocusProxy);
    QVERIFY(!lineEdit->hasFocus());
    QVERIFY(lineEditFocusProxy->hasFocus());
}

void tst_QWidget::explicitTabOrderWithComplexWidget()
{
    // Check that handling tab/backtab with a widget comprimised of other widgets
    // handles tabbing correctly
    Container window;
    auto lineEditOne = new QLineEdit;
    window.box->addWidget(lineEditOne);
    auto lineEditTwo = new QLineEdit;
    window.box->addWidget(lineEditTwo);
    QWidget::setTabOrder(lineEditOne, lineEditTwo);
    lineEditOne->setFocus();
    window.show();
    QApplicationPrivate::setActiveWindow(&window);
    QVERIFY(QTest::qWaitForWindowActive(&window));
    QTRY_COMPARE(QApplication::focusWidget(), lineEditOne);

    window.tab();
    QTRY_COMPARE(QApplication::focusWidget(), lineEditTwo);
    window.tab();
    QTRY_COMPARE(QApplication::focusWidget(), lineEditOne);
    window.backTab();
    QTRY_COMPARE(QApplication::focusWidget(), lineEditTwo);
    window.backTab();
    QTRY_COMPARE(QApplication::focusWidget(), lineEditOne);
}

void tst_QWidget::explicitTabOrderWithSpinBox_QTBUG81097()
{
    // Check the special case of QAbstractSpinBox-like widgets, that have a
    // child widget with a focusPolicy() set to its parent.
    Container window;
    auto spinBoxOne = new QDoubleSpinBox;
    auto spinBoxTwo = new QDoubleSpinBox;
    auto lineEdit = new QLineEdit;
    window.box->addWidget(spinBoxOne);
    window.box->addWidget(spinBoxTwo);
    window.box->addWidget(lineEdit);
    QWidget::setTabOrder(spinBoxOne, spinBoxTwo);
    QWidget::setTabOrder(spinBoxTwo, lineEdit);
    spinBoxOne->setFocus();
    window.show();
    QApplicationPrivate::setActiveWindow(&window);
    QVERIFY(QTest::qWaitForWindowActive(&window));
    QTRY_COMPARE(QApplication::focusWidget(), spinBoxOne);

    window.tab();
    QTRY_COMPARE(QApplication::focusWidget(), spinBoxTwo);
    window.tab();
    QTRY_COMPARE(QApplication::focusWidget(), lineEdit);
    window.backTab();
    QTRY_COMPARE(QApplication::focusWidget(), spinBoxTwo);
    window.backTab();
    QTRY_COMPARE(QApplication::focusWidget(), spinBoxOne);
    window.backTab();
    QTRY_COMPARE(QApplication::focusWidget(), lineEdit);
}

#if defined(Q_OS_WIN)
void tst_QWidget::activation()
{
    Q_CHECK_PAINTEVENTS

    QWidget widget1;
    widget1.setObjectName("activation-Widget1");
    widget1.setWindowTitle(widget1.objectName());

    QWidget widget2;
    widget1.setObjectName("activation-Widget2");
    widget1.setWindowTitle(widget2.objectName());

    widget1.show();
    widget2.show();

    QTRY_COMPARE(QApplication::activeWindow(), &widget2);
    widget2.showMinimized();

    QTRY_COMPARE(QApplication::activeWindow(), &widget1);
    widget2.showMaximized();
    QTRY_COMPARE(QApplication::activeWindow(), &widget2);
    widget2.showMinimized();
    QTRY_COMPARE(QApplication::activeWindow(), &widget1);
    widget2.showNormal();
    QTRY_COMPARE(QApplication::activeWindow(), &widget2);
    widget2.hide();
    QTRY_COMPARE(QApplication::activeWindow(), &widget1);
}
#endif // Q_OS_WIN

struct WindowStateChangeWatcher : public QObject
{
    WindowStateChangeWatcher(QWidget *widget)
    {
        Q_ASSERT(widget->window()->windowHandle());
        widget->window()->windowHandle()->installEventFilter(this);
        lastWindowStates = widget->window()->windowHandle()->windowState();
    }
    Qt::WindowStates lastWindowStates;
protected:
    bool eventFilter(QObject *receiver, QEvent *event) override
    {
        if (event->type() == QEvent::WindowStateChange)
            lastWindowStates = static_cast<QWindow *>(receiver)->windowState();
        return QObject::eventFilter(receiver, event);
    }
};

void tst_QWidget::windowState()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    if (m_platform == QStringLiteral("xcb"))
        QSKIP("X11: Many window managers do not support window state properly, which causes this test to fail.");
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");

    QPoint pos;
    QSize size = m_testWidgetSize;
    const Qt::WindowState defaultWidgetState =
            QGuiApplicationPrivate::platformIntegration()->defaultWindowState(Qt::Widget);
    if (defaultWidgetState == Qt::WindowFullScreen)
        size = QGuiApplication::primaryScreen()->size();
    else if (defaultWidgetState == Qt::WindowMaximized)
        size = QGuiApplication::primaryScreen()->availableSize();
    else
        pos = QPoint(10, 10);

    QWidget widget1;
    widget1.move(pos);
    widget1.resize(size);
    QCOMPARE(widget1.pos(), pos);
    QCOMPARE(widget1.size(), size);
    QTest::qWait(100);
    widget1.setObjectName(QStringLiteral("windowState-Widget1"));
    widget1.setWindowTitle(widget1.objectName());
    QCOMPARE(widget1.pos(), pos);
    QCOMPARE(widget1.size(), size);

#define VERIFY_STATE(s)                                                                            \
    QCOMPARE(int(widget1.windowState() & stateMask), int(s));                                      \
    QCOMPARE(int(widget1.windowHandle()->windowStates() & stateMask), int(s))

    const auto stateMask = Qt::WindowMaximized | Qt::WindowMinimized | Qt::WindowFullScreen;

    widget1.setWindowState(Qt::WindowMaximized);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowMaximized);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMaximized);

    widget1.setVisible(true);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowMaximized);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMaximized);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMaximized);
    QTest::qWait(100);
    QVERIFY(!(widget1.windowState() & Qt::WindowMaximized));
    QTRY_VERIFY2(HighDpi::fuzzyCompare(widget1.pos(), pos, m_fuzz),
                 qPrintable(HighDpi::msgPointMismatch(widget1.pos(), pos)));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowNoState);

    widget1.setWindowState(Qt::WindowMinimized);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowMinimized);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMinimized);

    widget1.setWindowState(widget1.windowState() | Qt::WindowMaximized);
    QTest::qWait(100);
    VERIFY_STATE((Qt::WindowMinimized|Qt::WindowMaximized));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMinimized);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMinimized);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowMaximized);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMaximized);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMaximized);
    QTest::qWait(100);
    QVERIFY(!(widget1.windowState() & (Qt::WindowMinimized|Qt::WindowMaximized)));
    QTRY_VERIFY2(HighDpi::fuzzyCompare(widget1.pos(), pos, m_fuzz),
                 qPrintable(HighDpi::msgPointMismatch(widget1.pos(), pos)));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowNoState);

    widget1.setWindowState(Qt::WindowFullScreen);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowFullScreen);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowFullScreen);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMinimized);
    QTest::qWait(100);
    VERIFY_STATE((Qt::WindowFullScreen|Qt::WindowMinimized));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMinimized);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMinimized);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowFullScreen);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowFullScreen);

    widget1.setWindowState(Qt::WindowNoState);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowNoState);
    QTRY_VERIFY2(HighDpi::fuzzyCompare(widget1.pos(), pos, m_fuzz),
                 qPrintable(HighDpi::msgPointMismatch(widget1.pos(), pos)));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowNoState);

    widget1.setWindowState(Qt::WindowFullScreen);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowFullScreen);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowFullScreen);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMaximized);
    QTest::qWait(100);
    VERIFY_STATE((Qt::WindowFullScreen|Qt::WindowMaximized));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowFullScreen);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMinimized);
    QTest::qWait(100);
    VERIFY_STATE((Qt::WindowFullScreen|Qt::WindowMaximized|Qt::WindowMinimized));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMinimized);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMinimized);
    QTest::qWait(100);
    VERIFY_STATE((Qt::WindowFullScreen|Qt::WindowMaximized));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowFullScreen);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowFullScreen);
    QTest::qWait(100);
    VERIFY_STATE(Qt::WindowMaximized);
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowMaximized);

    widget1.setWindowState(widget1.windowState() ^ Qt::WindowMaximized);
    QTest::qWait(100);
    QVERIFY(!(widget1.windowState() & stateMask));
    QCOMPARE(widget1.windowHandle()->windowState(), Qt::WindowNoState);

    QTRY_VERIFY2(HighDpi::fuzzyCompare(widget1.pos(), pos, m_fuzz),
                 qPrintable(HighDpi::msgPointMismatch(widget1.pos(), pos)));
    QTRY_COMPARE(widget1.size(), size);
}

// Test propagation of size and state from platform window to QWidget
// Windows and linux/XCB only
void tst_QWidget::resizePropagation()
{
#if !defined(Q_OS_LINUX) && !defined(Q_OS_WIN)
    QSKIP("resizePropagation test is designed for Linux/XCB and Windows only");
#endif
    const bool xcb = (m_platform == QStringLiteral("xcb"));
#ifdef Q_OS_LINUX
    if (!xcb)
        QSKIP("resizePropagation test is designed for XCB only");
#endif

    // Windows:
    // When a widget is maximized after it has been resized, the widget retains its original size,
    // while the window shows maximum size.
    // windowStateChanged signal gets fired on a no-op change from/to WindowNoState

    // Initialize widget and signal spy for window handle
    QWidget widget;
    widget.showMaximized();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QWindow *window = widget.windowHandle();
    QTRY_VERIFY(window);
    QSignalSpy spy(window, &QWindow::windowStateChanged);
    int count = 0;

    const QSize screenSize = QGuiApplication::primaryScreen()->size();
    const QSize size1 = QSize(screenSize.width() * 0.5, screenSize.height() * 0.5);
    const QSize size2 = QSize(screenSize.width() * 0.625, screenSize.height() * 0.833);

    enum CountIncrementCheck {Equal, Greater};
    enum TargetSizeCheck {Fail, Warn};
    auto verifyResize = [&](const QSize &size, Qt::WindowState windowState,
                            CountIncrementCheck checkCountIncrement,
                            TargetSizeCheck checkTargetSize)
    {
        // Capture count of latest async signals
        if (checkCountIncrement == Equal)
            count = spy.count();

        // Resize if required
        if (size.isValid())
            widget.resize(size);

        // Wait for the widget anyway
        QVERIFY(QTest::qWaitForWindowExposed(&widget));

        // Check signal count and qDebug output for fail analysis
        switch (checkCountIncrement) {
        case Greater: {
                auto logger = qScopeGuard([&](){
                    qDebug() << "spy count:" << spy.count() << "previous count:" << count;
                });
                QTRY_VERIFY(spy.count() > count);
                logger.dismiss();
                count = spy.count();
            }
            break;
        case Equal: {
                auto logger = qScopeGuard([&](){
                   qDebug() << spy << widget.windowState() << window->windowState();
                });
                QCOMPARE(spy.count(), count);
                logger.dismiss();
            }
            break;
        }

        // QTRY necessary because state changes are propagated async
        QTRY_COMPARE(widget.windowState(), windowState);
        QTRY_COMPARE(window->windowState(), windowState);

        // Check target size with fail or warning
        switch (checkTargetSize) {
        case Fail:
            QCOMPARE(widget.size(), window->size());
            break;
        case Warn:
            if (widget.size() != window->size()) {
                qWarning() << m_platform << "size mismtach tolerated. Widget:"
                           << widget.size() << "Window:" << window->size();
            }
            break;
        }
    };

    // test state and size consistency of maximized window
    verifyResize(QSize(), Qt::WindowMaximized, Equal, Fail);
    if (QTest::currentTestFailed())
        return;

    // test state transition, state and size consistency after resize
    verifyResize(size1, Qt::WindowNoState, Greater, xcb ? Warn : Fail );
    if (QTest::currentTestFailed())
        return;

    // test unchanged state, state and size consistency after resize
    verifyResize(size2, Qt::WindowNoState, Equal, xcb ? Warn : Fail);
    if (QTest::currentTestFailed())
        return;

    // test state transition, state and size consistency after maximize
    widget.showMaximized();
    verifyResize(QSize(), Qt::WindowMaximized, Greater, xcb ? Fail : Warn);
    if (QTest::currentTestFailed())
        return;

#ifdef Q_OS_WIN
    QCOMPARE(widget.size(), size2);
#endif
}

void tst_QWidget::showMaximized()
{
    QWidget plain;
    QHBoxLayout *layout;
    layout = new QHBoxLayout;
    QWidget layouted;
    QLineEdit le;
    QLineEdit le2;
    QLineEdit le3;

    layout->addWidget(&le);
    layout->addWidget(&le2);
    layout->addWidget(&le3);

    layouted.setLayout(layout);

    plain.showMaximized();
    QVERIFY(plain.windowState() & Qt::WindowMaximized);

    plain.showNormal();
    QVERIFY(!(plain.windowState() & Qt::WindowMaximized));

    layouted.showMaximized();
    QVERIFY(layouted.windowState() & Qt::WindowMaximized);

    layouted.showNormal();
    QVERIFY(!(layouted.windowState() & Qt::WindowMaximized));

    // ### fixme: embedded may choose a different size to fit on the screen.
    if (layouted.size() != layouted.sizeHint())
        QEXPECT_FAIL("", "QTBUG-22326", Continue);
    QCOMPARE(layouted.size(), layouted.sizeHint());

    layouted.showMaximized();
    QVERIFY(layouted.isMaximized());
    QVERIFY(layouted.isVisible());

    layouted.hide();
    QVERIFY(layouted.isMaximized());
    QVERIFY(!layouted.isVisible());

    layouted.showMaximized();
    QVERIFY(layouted.isMaximized());
    QVERIFY(layouted.isVisible());

    layouted.showMinimized();
    QVERIFY(layouted.isMinimized());
    QVERIFY(layouted.isMaximized());

    layouted.showMaximized();
    QVERIFY(!layouted.isMinimized());
    QVERIFY(layouted.isMaximized());
    QVERIFY(layouted.isVisible());

    layouted.showMinimized();
    QVERIFY(layouted.isMinimized());
    QVERIFY(layouted.isMaximized());

    layouted.showMaximized();
    QVERIFY(!layouted.isMinimized());
    QVERIFY(layouted.isMaximized());
    QVERIFY(layouted.isVisible());

    {
        QWidget frame;
        QWidget widget(&frame);
        widget.showMaximized();
        QVERIFY(widget.isMaximized());
    }

    {
        QWidget widget;
        setFrameless(&widget);
        widget.setGeometry(0, 0, 10, 10);
        widget.showMaximized();
        QTRY_VERIFY(widget.size().width() > 20 && widget.size().height() > 20);
    }
}

void tst_QWidget::showFullScreen()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    QWidget plain;
    QHBoxLayout *layout;
    QWidget layouted;
    QLineEdit le;
    QLineEdit le2;
    QLineEdit le3;
    layout = new QHBoxLayout;

    layout->addWidget(&le);
    layout->addWidget(&le2);
    layout->addWidget(&le3);

    layouted.setLayout(layout);

    plain.showFullScreen();
    QVERIFY(plain.windowState() & Qt::WindowFullScreen);
    QVERIFY(plain.windowHandle());
    QVERIFY(plain.windowHandle()->screen());
    const QRect expectedFullScreenGeometry = plain.windowHandle()->screen()->geometry();
    QTRY_COMPARE(plain.geometry(), expectedFullScreenGeometry);

    plain.showNormal();
    QVERIFY(!(plain.windowState() & Qt::WindowFullScreen));

    layouted.showFullScreen();
    QVERIFY(layouted.windowState() & Qt::WindowFullScreen);
    QTRY_COMPARE(layouted.geometry(), expectedFullScreenGeometry);

    layouted.showNormal();
    QVERIFY(!(layouted.windowState() & Qt::WindowFullScreen));

    // ### fixme: embedded may choose a different size to fit on the screen.
    if (layouted.size() != layouted.sizeHint())
        QEXPECT_FAIL("", "QTBUG-22326", Continue);
    QCOMPARE(layouted.size(), layouted.sizeHint());

    layouted.showFullScreen();
    QVERIFY(layouted.isFullScreen());
    QVERIFY(layouted.isVisible());
    QTRY_COMPARE(layouted.geometry(), expectedFullScreenGeometry);

    layouted.hide();
    QVERIFY(layouted.isFullScreen());
    QVERIFY(!layouted.isVisible());

    layouted.showFullScreen();
    QVERIFY(layouted.isFullScreen());
    QVERIFY(layouted.isVisible());
    QTRY_COMPARE(layouted.geometry(), expectedFullScreenGeometry);

    layouted.showMinimized();
    QVERIFY(layouted.isMinimized());
    QVERIFY(layouted.isFullScreen());

    layouted.showFullScreen();
    QVERIFY(!layouted.isMinimized());
    QVERIFY(layouted.isFullScreen());
    QVERIFY(layouted.isVisible());
    QTRY_COMPARE(layouted.geometry(), expectedFullScreenGeometry);

    layouted.showMinimized();
    QVERIFY(layouted.isMinimized());
    QVERIFY(layouted.isFullScreen());

    layouted.showFullScreen();
    QVERIFY(!layouted.isMinimized());
    QVERIFY(layouted.isFullScreen());
    QVERIFY(layouted.isVisible());
    QTRY_COMPARE(layouted.geometry(), expectedFullScreenGeometry);

    {
        QWidget frame;
        QWidget widget(&frame);
        widget.showFullScreen();
        QVERIFY(widget.isFullScreen());
        QTRY_COMPARE(layouted.geometry(), expectedFullScreenGeometry);
    }
}

class ResizeWidget : public QWidget {
public:
    explicit ResizeWidget(QWidget *p = nullptr) : QWidget(p)
    {
        setObjectName(QLatin1String("ResizeWidget"));
        setWindowTitle(objectName());
    }
protected:
    void resizeEvent(QResizeEvent *e) override
    {
        QCOMPARE(size(), e->size());
        ++m_resizeEventCount;
    }

public:
    int m_resizeEventCount = 0;
};

void tst_QWidget::resizeEvent()
{
    {
        QWidget wParent;
        wParent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        wParent.resize(m_testWidgetSize);
        ResizeWidget wChild(&wParent);
        QTestPrivate::androidCompatibleShow(&wParent);
        QVERIFY(QTest::qWaitForWindowExposed(&wParent));
        QCOMPARE (wChild.m_resizeEventCount, 1); // initial resize event before paint
        wParent.hide();
        QSize safeSize(640,480);
        if (wChild.size() == safeSize)
            safeSize.setWidth(639);
        wChild.resize(safeSize);
        QCOMPARE (wChild.m_resizeEventCount, 1);
        QTestPrivate::androidCompatibleShow(&wParent);
        QCOMPARE (wChild.m_resizeEventCount, 2);
    }

    {
        ResizeWidget wTopLevel;
        wTopLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        wTopLevel.resize(m_testWidgetSize);
        QTestPrivate::androidCompatibleShow(&wTopLevel);
        QVERIFY(QTest::qWaitForWindowExposed(&wTopLevel));
        QCOMPARE (wTopLevel.m_resizeEventCount, 1); // initial resize event before paint for toplevels
        wTopLevel.hide();
        QSize safeSize(640,480);
        if (wTopLevel.size() == safeSize)
            safeSize.setWidth(639);
        wTopLevel.resize(safeSize);
        QCOMPARE (wTopLevel.m_resizeEventCount, 1);
        QTestPrivate::androidCompatibleShow(&wTopLevel);
        QVERIFY(QTest::qWaitForWindowExposed(&wTopLevel));
        QCOMPARE (wTopLevel.m_resizeEventCount, 2);
    }
}

void tst_QWidget::showMinimized()
{
    if (m_platform == QStringLiteral("wayland")) {
        QSKIP("Wayland: Neither xdg_shell, wl_shell or ivi_application support "
              "letting a client know whether it's minimized. So on these shells "
              "Qt Wayland will always report that it's unmimized.");
    }

    QWidget plain;
    plain.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    plain.move(100, 100);
    plain.resize(200, 200);
    QPoint pos = plain.pos();

    plain.showMinimized();
    QVERIFY(plain.isMinimized());
    QVERIFY(plain.isVisible());
    QVERIFY2(HighDpi::fuzzyCompare(plain.pos(), pos, m_fuzz),
             qPrintable(HighDpi::msgPointMismatch(plain.pos(), pos)));

    plain.showNormal();
    QVERIFY(!plain.isMinimized());
    QVERIFY(plain.isVisible());
    QVERIFY2(HighDpi::fuzzyCompare(plain.pos(), pos, m_fuzz),
             qPrintable(HighDpi::msgPointMismatch(plain.pos(), pos)));

    plain.showMinimized();
    QVERIFY(plain.isMinimized());
    QVERIFY(plain.isVisible());
    QVERIFY2(HighDpi::fuzzyCompare(plain.pos(), pos, m_fuzz),
             qPrintable(HighDpi::msgPointMismatch(plain.pos(), pos)));

    plain.hide();
    QVERIFY(plain.isMinimized());
    QVERIFY(!plain.isVisible());

    plain.showMinimized();
    QVERIFY(plain.isMinimized());
    QVERIFY(plain.isVisible());

    plain.setGeometry(200, 200, 300, 300);
    plain.showNormal();
    QCOMPARE(plain.geometry(), QRect(200, 200, 300, 300));

    {
        QWidget frame;
        QWidget widget(&frame);
        widget.showMinimized();
        QVERIFY(widget.isMinimized());
    }
}

void tst_QWidget::showMinimizedKeepsFocus()
{
    if (m_platform == QStringLiteral("xcb"))
        QSKIP("QTBUG-26424");
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("Window activation is not supported.");
    if (m_platform == QStringLiteral("offscreen"))
        QSKIP("Platform offscreen does not support showMinimized()");

    //here we test that minimizing a widget and restoring it doesn't change the focus inside of it
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget child1(&window), child2(&window);
        child1.setFocusPolicy(Qt::StrongFocus);
        child2.setFocusPolicy(Qt::StrongFocus);
        window.show();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
        child2.setFocus();

        QTRY_COMPARE(window.focusWidget(), &child2);
        QTRY_COMPARE(QApplication::focusWidget(), &child2);

        window.showMinimized();
        QTRY_VERIFY(window.isMinimized());
        QTRY_COMPARE(window.focusWidget(), &child2);

        window.showNormal();
        QTest::qWait(10);
        QTRY_COMPARE(window.focusWidget(), &child2);
    }

    //testing deletion of the focusWidget
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget *child = new QWidget(&window);
        child->setFocusPolicy(Qt::StrongFocus);
        window.show();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
        child->setFocus();
        QTRY_COMPARE(window.focusWidget(), child);
        QTRY_COMPARE(QApplication::focusWidget(), child);

        delete child;
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);
    }

    //testing reparenting the focus widget
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget *child = new QWidget(&window);
        child->setFocusPolicy(Qt::StrongFocus);
        window.show();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
        child->setFocus();
        QTRY_COMPARE(window.focusWidget(), child);
        QTRY_COMPARE(QApplication::focusWidget(), child);

        child->setParent(nullptr);
        QScopedPointer<QWidget> childGuard(child);
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);
    }

    //testing setEnabled(false)
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget *child = new QWidget(&window);
        child->setFocusPolicy(Qt::StrongFocus);
        window.show();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
        child->setFocus();
        QTRY_COMPARE(window.focusWidget(), child);
        QTRY_COMPARE(QApplication::focusWidget(), child);

        child->setEnabled(false);
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);
    }

    //testing clearFocus
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget *firstchild = new QWidget(&window);
        firstchild->setFocusPolicy(Qt::StrongFocus);
        QWidget *child = new QWidget(&window);
        child->setFocusPolicy(Qt::StrongFocus);
        window.show();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
        child->setFocus();
        QTRY_COMPARE(window.focusWidget(), child);
        QTRY_COMPARE(QApplication::focusWidget(), child);

        child->clearFocus();
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        window.showMinimized();
        QTest::qWait(30);
        QTRY_VERIFY(window.isMinimized());
        QCOMPARE(window.focusWidget(), nullptr);
        QTRY_COMPARE(QApplication::focusWidget(), nullptr);

        window.showNormal();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
#ifdef Q_OS_MACOS
        if (!macHasAccessToWindowsServer())
            QEXPECT_FAIL("", "When not having WindowServer access, we lose focus.", Continue);
#endif
        QTRY_COMPARE(window.focusWidget(), firstchild);
#ifdef Q_OS_MACOS
        if (!macHasAccessToWindowsServer())
            QEXPECT_FAIL("", "When not having WindowServer access, we lose focus.", Continue);
#endif
        QTRY_COMPARE(QApplication::focusWidget(), firstchild);
    }
}


void tst_QWidget::reparent()
{
    QWidget parent;
    parent.setWindowTitle(QStringLiteral("Toplevel ") + __FUNCTION__);
    const QPoint parentPosition = m_availableTopLeft + QPoint(300, 300);
    parent.setGeometry(QRect(parentPosition, m_testWidgetSize));

    QWidget child;
    child.setObjectName("child");
    child.setGeometry(10, 10, 180, 130);
    QPalette pal1;
    pal1.setColor(child.backgroundRole(), Qt::white);
    child.setPalette(pal1);

    QWidget childTLW(&child, Qt::Window);
    childTLW.setObjectName(QStringLiteral("childTLW ") +  __FUNCTION__);
    childTLW.setWindowTitle(childTLW.objectName());
    childTLW.setGeometry(QRect(m_availableTopLeft + QPoint(100, 100), m_testWidgetSize));
    QPalette pal2;
    pal2.setColor(childTLW.backgroundRole(), Qt::yellow);
    childTLW.setPalette(pal2);

    QTestPrivate::androidCompatibleShow(&parent);
    QTestPrivate::androidCompatibleShow(&childTLW);
    QVERIFY(QTest::qWaitForWindowExposed(&parent));

    parent.move(parentPosition);

    QPoint childPos = parent.mapToGlobal(child.pos());
    QPoint tlwPos = childTLW.pos();

    child.setParent(nullptr, child.windowFlags() & ~Qt::WindowType_Mask);
    child.setGeometry(childPos.x(), childPos.y(), child.width(), child.height());
    QTestPrivate::androidCompatibleShow(&child);

#if 0   // QTBUG-26424
    if (m_platform == QStringLiteral("xcb"))
        QEXPECT_FAIL("", "On X11, the window manager will apply NorthWestGravity rules to 'child', which"
                         " means the top-left corner of the window frame will be placed at 'childPos'"
                         " causing this test to fail.", Continue);
#endif

    QCOMPARE(child.geometry().topLeft(), childPos);
    QTRY_COMPARE(childTLW.pos(), tlwPos);
}

void tst_QWidget::setScreen()
{
    const auto screens = QApplication::screens();
    if (screens.size() < 2)
        QSKIP("This test tests nothing on a machine with a single screen.");

    QScreen *screen0 = screens.at(0);
    QScreen *screen1 = screens.at(1);

    QWidget window;
    window.setWindowFlags(Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
    window.setScreen(screen0);
    QCOMPARE(window.screen(), screen0);
    window.setScreen(screen1);
    QCOMPARE(window.screen(), screen1);

    // calling setScreen on a widget that is not a window does nothing
    QWidget child(&window);
    const QScreen *childScreen = child.screen();
    child.setScreen(childScreen == screen0 ? screen1 : screen0);
    QCOMPARE(child.screen(), childScreen);
}

// Qt/Embedded does it differently.
void tst_QWidget::icon()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    QPixmap p(20,20);
    p.fill(Qt::red);
    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->show();
    QVERIFY(QTest::qWaitForWindowExposed(testWidget.data()));
    testWidget->setWindowIcon(p);

    QVERIFY(!testWidget->windowIcon().isNull());
    testWidget->show();
    QVERIFY(!testWidget->windowIcon().isNull());
    testWidget->showFullScreen();
    QVERIFY(!testWidget->windowIcon().isNull());
    testWidget->showNormal();
    QVERIFY(!testWidget->windowIcon().isNull());
}

void tst_QWidget::hideWhenFocusWidgetIsChild()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("Window activation is not supported.");

    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->setWindowTitle(__FUNCTION__);
    testWidget->resize(m_testWidgetSize);
    centerOnScreen(testWidget.data());
    QWidget *parentWidget(new QWidget(testWidget.data()));
    parentWidget->setObjectName("parentWidget");
    parentWidget->setGeometry(0, 0, 100, 100);
    QLineEdit *edit = new QLineEdit(parentWidget);
    edit->setObjectName("edit1");
    QLineEdit *edit3 = new QLineEdit(parentWidget);
    edit3->setObjectName("edit3");
    edit3->move(0,50);
    QLineEdit *edit2 = new QLineEdit(testWidget.data());
    edit2->setObjectName("edit2");
    edit2->move(110, 100);
    edit->setFocus();
    testWidget->show();
    testWidget->activateWindow();
    QVERIFY(QTest::qWaitForWindowActive(testWidget.data()));

    QString actualFocusWidget, expectedFocusWidget;
    if (!QApplication::focusWidget() && m_platform == QStringLiteral("xcb"))
        QSKIP("X11: Your window manager is too broken for this test");

    QVERIFY(QApplication::focusWidget());
    actualFocusWidget = QString::asprintf("%p %s %s", QApplication::focusWidget(), QApplication::focusWidget()->objectName().toLatin1().constData(), QApplication::focusWidget()->metaObject()->className());
    expectedFocusWidget = QString::asprintf("%p %s %s", edit, edit->objectName().toLatin1().constData(), edit->metaObject()->className());
    QCOMPARE(actualFocusWidget, expectedFocusWidget);

    parentWidget->hide();
    QCoreApplication::processEvents();
    actualFocusWidget = QString::asprintf("%p %s %s", QApplication::focusWidget(), QApplication::focusWidget()->objectName().toLatin1().constData(), QApplication::focusWidget()->metaObject()->className());
    expectedFocusWidget = QString::asprintf("%p %s %s", edit2, edit2->objectName().toLatin1().constData(), edit2->metaObject()->className());
    QCOMPARE(actualFocusWidget, expectedFocusWidget);
}

void tst_QWidget::normalGeometry()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    QWidget parent;
    QCOMPARE(parent.normalGeometry(), parent.geometry());
    parent.setWindowTitle("NormalGeometry parent");
    QWidget *child = new QWidget(&parent);

    QCOMPARE(parent.normalGeometry(), parent.geometry());
    QCOMPARE(child->normalGeometry(), QRect());

    parent.setGeometry(QRect(m_availableTopLeft + QPoint(100 ,100), m_testWidgetSize));
    parent.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));
    WindowStateChangeWatcher stateChangeWatcher(&parent);

    const QRect normalGeometry = parent.geometry();
    // We can't make any assumptions about the actual geometry compared to the
    // requested geometry. In this test, we only care about normalGeometry.
    QCOMPARE(parent.normalGeometry(), normalGeometry);

    parent.setWindowState(parent.windowState() ^ Qt::WindowMaximized);
    QTRY_VERIFY(parent.windowState() & Qt::WindowMaximized);
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_VERIFY(parent.geometry() != normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.setWindowState(parent.windowState() ^ Qt::WindowMaximized);
    QTRY_VERIFY(!(parent.windowState() & Qt::WindowMaximized));
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_COMPARE(parent.geometry(), normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.showMaximized();
    QTRY_VERIFY(parent.windowHandle()->windowState() & Qt::WindowMaximized);
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_VERIFY(parent.geometry() != normalGeometry);
    QCOMPARE(parent.normalGeometry(), normalGeometry);

    parent.showNormal();
    QTRY_VERIFY(!(parent.windowState() & Qt::WindowMaximized));
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_COMPARE(parent.geometry(), normalGeometry);
    QCOMPARE(parent.normalGeometry(), normalGeometry);

    parent.setWindowState(parent.windowState() ^ Qt::WindowFullScreen);
    QTRY_VERIFY(parent.windowState() & Qt::WindowFullScreen);
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_VERIFY(parent.geometry() != normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.setWindowState(Qt::WindowNoState);
    QTRY_VERIFY(!(parent.windowState() & Qt::WindowFullScreen));
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_COMPARE(parent.geometry(), normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.showFullScreen();
    QTRY_VERIFY(parent.window()->windowState() & Qt::WindowFullScreen);
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_VERIFY(parent.geometry() != normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.showNormal();
    QTRY_VERIFY(!(parent.windowHandle()->windowState() & Qt::WindowFullScreen));
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_COMPARE(parent.geometry(), normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    if (m_platform == QStringLiteral("xcb"))
        QSKIP("QTBUG-26424");

    parent.setWindowState(parent.windowState() ^ Qt::WindowMaximized);
    QTRY_VERIFY(stateChangeWatcher.lastWindowStates & Qt::WindowMaximized);
    parent.setWindowState(parent.windowState() ^ Qt::WindowMinimized);
    QTRY_VERIFY(stateChangeWatcher.lastWindowStates & Qt::WindowMinimized);

    QTRY_COMPARE(parent.windowState() & (Qt::WindowMinimized|Qt::WindowMaximized), Qt::WindowMinimized|Qt::WindowMaximized);
    QTRY_VERIFY(stateChangeWatcher.lastWindowStates & (Qt::WindowMinimized|Qt::WindowMaximized));
    // ### when minimized and maximized at the same time, the geometry
    // ### does *NOT* have to be the normal geometry, it could be the
    // ### maximized geometry.
    // QCOMPARE(parent.geometry(), geom);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.setWindowState(parent.windowState() ^ Qt::WindowMinimized);
    QTRY_VERIFY(!(parent.windowState() & Qt::WindowMinimized));
    QTRY_VERIFY(parent.windowState() & Qt::WindowMaximized);
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_VERIFY(parent.geometry() != normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.setWindowState(parent.windowState() ^ Qt::WindowMaximized);
    QTRY_VERIFY(!(parent.windowState() & Qt::WindowMaximized));
    QTRY_COMPARE(stateChangeWatcher.lastWindowStates, parent.windowState());
    QTRY_COMPARE(parent.geometry(), normalGeometry);
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);

    parent.showNormal();
    stateChangeWatcher.lastWindowStates = {};
    parent.setWindowState(Qt:: WindowFullScreen | Qt::WindowMaximized);
    parent.setWindowState(Qt::WindowMinimized | Qt:: WindowFullScreen | Qt::WindowMaximized);
    parent.setWindowState(Qt:: WindowFullScreen | Qt::WindowMaximized);
    // the actual window will be either fullscreen or maximized
    QTRY_VERIFY(stateChangeWatcher.lastWindowStates & (Qt:: WindowFullScreen | Qt::WindowMaximized));
    QTRY_COMPARE(parent.normalGeometry(), normalGeometry);
}

void tst_QWidget::setGeometry()
{
    QWidget tlw;
    tlw.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QWidget child(&tlw);

    const QSize initialSize = 2 * m_testWidgetSize;
    QRect tr(m_availableTopLeft + QPoint(100,100), initialSize);
    QRect cr(50,50,50,50);
    tlw.setGeometry(tr);
    child.setGeometry(cr);
    tlw.showNormal();
    QTRY_COMPARE(tlw.geometry().size(), tr.size());
    QCOMPARE(child.geometry(), cr);

    tlw.setParent(nullptr, Qt::Window|Qt::FramelessWindowHint);
    tr = QRect(m_availableTopLeft, initialSize / 2);
    tlw.setGeometry(tr);
    QCOMPARE(tlw.geometry(), tr);
    tlw.showNormal();
    if (!QTest::qWaitFor([&tlw]{ return tlw.frameGeometry() == tlw.geometry(); }))
        QSKIP("Your window manager is too broken for this test");
    if (m_platform == QStringLiteral("xcb") && tlw.geometry() != tr)
        QEXPECT_FAIL("", "QTBUG-26424", Continue);
    QCOMPARE(tlw.geometry(), tr);
}

void tst_QWidget::setGeometryHidden()
{
    if (QGuiApplication::styleHints()->showIsMaximized())
        QSKIP("Platform does not support QWidget::setGeometry() - skipping");

    QWidget tlw;
    tlw.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QWidget child(&tlw);

    const QRect tr(m_availableTopLeft + QPoint(100, 100), 2 * m_testWidgetSize);
    const QRect cr(QPoint(50, 50), m_testWidgetSize);
    tlw.setGeometry(tr);
    child.setGeometry(cr);
    tlw.showNormal();

    tlw.hide();
    QTRY_VERIFY(tlw.isHidden());
    tlw.setGeometry(cr);
    QVERIFY(tlw.testAttribute(Qt::WA_PendingMoveEvent));
    QVERIFY(tlw.testAttribute(Qt::WA_PendingResizeEvent));
    QImage img(tlw.size(), QImage::Format_ARGB32);  // just needed to call QWidget::render()
    tlw.render(&img);
    QVERIFY(!tlw.testAttribute(Qt::WA_PendingMoveEvent));
    QVERIFY(!tlw.testAttribute(Qt::WA_PendingResizeEvent));
    tlw.setGeometry(cr);
    QVERIFY(!tlw.testAttribute(Qt::WA_PendingMoveEvent));
    QVERIFY(!tlw.testAttribute(Qt::WA_PendingResizeEvent));
    tlw.resize(cr.size());
    QVERIFY(!tlw.testAttribute(Qt::WA_PendingMoveEvent));
    QVERIFY(!tlw.testAttribute(Qt::WA_PendingResizeEvent));
}

void tst_QWidget::windowOpacity()
{
    QWidget widget;
    QWidget child(&widget);

    // Initial value should be 1.0
    QCOMPARE(widget.windowOpacity(), 1.0);
    // children should always return 1.0
    QCOMPARE(child.windowOpacity(), 1.0);

    widget.setWindowOpacity(0.0);
    QCOMPARE(widget.windowOpacity(), 0.0);
    child.setWindowOpacity(0.0);
    QCOMPARE(child.windowOpacity(), 1.0);

    widget.setWindowOpacity(1.0);
    QCOMPARE(widget.windowOpacity(), 1.0);
    child.setWindowOpacity(1.0);
    QCOMPARE(child.windowOpacity(), 1.0);

    widget.setWindowOpacity(2.0);
    QCOMPARE(widget.windowOpacity(), 1.0);
    child.setWindowOpacity(2.0);
    QCOMPARE(child.windowOpacity(), 1.0);

    widget.setWindowOpacity(-1.0);
    QCOMPARE(widget.windowOpacity(), 0.0);
    child.setWindowOpacity(-1.0);
    QCOMPARE(child.windowOpacity(), 1.0);
}

class UpdateWidget : public QWidget
{
public:
    explicit UpdateWidget(QWidget *parent = nullptr) : QWidget(parent)
    {
        setObjectName(QLatin1String("UpdateWidget"));
        reset();
    }

    void paintEvent(QPaintEvent *e) override
    {
        paintedRegion += e->region();
        ++numPaintEvents;
        if (resizeInPaintEvent) {
            resizeInPaintEvent = false;
            resize(size() + QSize(2, 2));
        }
    }

    bool event(QEvent *event) override
    {
        switch (event->type()) {
        case QEvent::ZOrderChange:
            ++numZOrderChangeEvents;
            break;
        case QEvent::UpdateRequest:
            ++numUpdateRequestEvents;
            break;
        case QEvent::ActivationChange:
        case QEvent::FocusIn:
        case QEvent::FocusOut:
        case QEvent::WindowActivate:
        case QEvent::WindowDeactivate:
            if (!updateOnActivationChangeAndFocusIn)
                return true; // Filter out to avoid update() calls in QWidget.
            break;
        default:
            break;
        }
        return QWidget::event(event);
    }

    void reset()
    {
        numPaintEvents = numZOrderChangeEvents = numUpdateRequestEvents = 0;
        updateOnActivationChangeAndFocusIn = resizeInPaintEvent = false;
        paintedRegion = QRegion();
    }

    int numPaintEvents;
    int numZOrderChangeEvents;
    int numUpdateRequestEvents;
    bool updateOnActivationChangeAndFocusIn;
    bool resizeInPaintEvent;
    QRegion paintedRegion;
};

void tst_QWidget::lostUpdatesOnHide()
{
#ifndef Q_OS_MACOS
    UpdateWidget widget;
    widget.setAttribute(Qt::WA_DontShowOnScreen);
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.show();
    widget.hide();
    QTest::qWait(50);
    widget.show();
    QTest::qWait(50);

    QCOMPARE(widget.numPaintEvents, 1);
#endif
}

void tst_QWidget::raise()
{
    std::unique_ptr<QWidget> parentPtr(new QWidget);
    parentPtr->resize(200, 200);
    parentPtr->setObjectName(QLatin1String("raise"));
    parentPtr->setWindowTitle(parentPtr->objectName());
    QList<UpdateWidget *> allChildren;

    UpdateWidget *child1 = new UpdateWidget(parentPtr.get());
    child1->setAutoFillBackground(true);
    allChildren.append(child1);

    UpdateWidget *child2 = new UpdateWidget(parentPtr.get());
    child2->setAutoFillBackground(true);
    allChildren.append(child2);

    UpdateWidget *child3 = new UpdateWidget(parentPtr.get());
    child3->setAutoFillBackground(true);
    allChildren.append(child3);

    UpdateWidget *child4 = new UpdateWidget(parentPtr.get());
    child4->setAutoFillBackground(true);
    allChildren.append(child4);

    parentPtr->show();
    QVERIFY(QTest::qWaitForWindowExposed(parentPtr.get()));

#ifdef Q_OS_MACOS
    if (child1->internalWinId()) {
        QSKIP("Cocoa has no Z-Order for views, we hack it, but it results in paint events.");
    }
#endif

    QObjectList list1{child1, child2, child3, child4};
    QCOMPARE(parentPtr->children(), list1);
    QCOMPARE(allChildren.size(), list1.size());

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = child == child4 ? 1 : 0;
        if (expectedPaintEvents == 0) {
            QCOMPARE(child->numPaintEvents, 0);
        } else {
            // show() issues multiple paint events on some window managers
            QTRY_VERIFY(child->numPaintEvents >= expectedPaintEvents);
        }
        QCOMPARE(child->numZOrderChangeEvents, 0);
        child->reset();
    }

    for (int i = 0; i < 5; ++i)
        child2->raise();
    QVERIFY(QTest::qWaitForWindowExposed(child2));
    QApplication::processEvents(); // process events that could be triggered by raise();

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = child == child2 ? 1 : 0;
        int expectedZOrderChangeEvents = child == child2 ? 1 : 0;
        QTRY_COMPARE(child->numPaintEvents, expectedPaintEvents);
        QCOMPARE(child->numZOrderChangeEvents, expectedZOrderChangeEvents);
        child->reset();
    }

    QList<QObject *> list2;
    list2 << child1 << child3 << child4 << child2;
    QCOMPARE(parentPtr->children(), list2);

    // Creates a widget on top of all the children and checks that raising one of
    // the children underneath doesn't trigger a repaint on the covering widget.
    QWidget topLevel;
    topLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QWidget *parent = parentPtr.release();
    parent->setParent(&topLevel);
    topLevel.show();

    UpdateWidget *onTop = new UpdateWidget(&topLevel);
    onTop->reset();
    onTop->resize(topLevel.size());
    onTop->setAutoFillBackground(true);
    onTop->show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QTRY_VERIFY(onTop->numPaintEvents > 0);
    QApplication::processEvents(); // process remaining paint events if there's more than one
    onTop->reset();

    // Reset all the children.
    for (UpdateWidget *child : std::as_const(allChildren))
        child->reset();

    for (int i = 0; i < 5; ++i)
        child3->raise();
    QVERIFY(QTest::qWaitForWindowExposed(child3));
    QApplication::processEvents(); // process events that could be triggered by raise();

    QCOMPARE(onTop->numPaintEvents, 0);
    QCOMPARE(onTop->numZOrderChangeEvents, 0);

    QObjectList list3{child1, child4, child2, child3};
    QCOMPARE(parent->children(), list3);

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = 0;
        int expectedZOrderChangeEvents = child == child3 ? 1 : 0;
        QTRY_COMPARE(child->numPaintEvents, expectedPaintEvents);
        QCOMPARE(child->numZOrderChangeEvents, expectedZOrderChangeEvents);
        child->reset();
    }
}

void tst_QWidget::lower()
{
    QScopedPointer<QWidget> parent(new QWidget);
    parent->setObjectName(QLatin1String("lower"));
    parent->setWindowTitle(parent->objectName());
    parent->resize(200, 200);
    QList<UpdateWidget *> allChildren;

    UpdateWidget *child1 = new UpdateWidget(parent.data());
    child1->setAutoFillBackground(true);
    allChildren.append(child1);

    UpdateWidget *child2 = new UpdateWidget(parent.data());
    child2->setAutoFillBackground(true);
    allChildren.append(child2);

    UpdateWidget *child3 = new UpdateWidget(parent.data());
    child3->setAutoFillBackground(true);
    allChildren.append(child3);

    UpdateWidget *child4 = new UpdateWidget(parent.data());
    child4->setAutoFillBackground(true);
    allChildren.append(child4);

    parent->show();
    QVERIFY(QTest::qWaitForWindowExposed(parent.data()));

    QObjectList list1{child1, child2, child3, child4};
    QCOMPARE(parent->children(), list1);
    QCOMPARE(allChildren.size(), list1.size());

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = child == child4 ? 1 : 0;
        if (expectedPaintEvents == 0) {
            QCOMPARE(child->numPaintEvents, 0);
        } else {
            // show() issues multiple paint events on some window managers
            QTRY_VERIFY(child->numPaintEvents >= expectedPaintEvents);
        }
        QCOMPARE(child->numZOrderChangeEvents, 0);
        child->reset();
    }

    for (int i = 0; i < 5; ++i)
        child4->lower();

    QTest::qWait(100);

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = child == child3 ? 1 : 0;
        int expectedZOrderChangeEvents = child == child4 ? 1 : 0;
        QTRY_COMPARE(child->numZOrderChangeEvents, expectedZOrderChangeEvents);
        QTRY_COMPARE(child->numPaintEvents, expectedPaintEvents);
        child->reset();
    }

    QList<QObject *> list2;
    list2 << child4 << child1 << child2 << child3;
    QCOMPARE(parent->children(), list2);
}

void tst_QWidget::stackUnder()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974: Cocoa has no Z-Order for views, we hack it, but it results in paint events.");
#endif

    QScopedPointer<QWidget> parent(new QWidget);
    parent->setObjectName(QLatin1String("stackUnder"));
    parent->setWindowTitle(parent->objectName());
    parent->resize(200, 200);
    QList<UpdateWidget *> allChildren;

    UpdateWidget *child1 = new UpdateWidget(parent.data());
    child1->setAutoFillBackground(true);
    allChildren.append(child1);

    UpdateWidget *child2 = new UpdateWidget(parent.data());
    child2->setAutoFillBackground(true);
    allChildren.append(child2);

    UpdateWidget *child3 = new UpdateWidget(parent.data());
    child3->setAutoFillBackground(true);
    allChildren.append(child3);

    UpdateWidget *child4 = new UpdateWidget(parent.data());
    child4->setAutoFillBackground(true);
    allChildren.append(child4);

    parent->show();
    QVERIFY(QTest::qWaitForWindowExposed(parent.data()));
    QObjectList list1{child1, child2, child3, child4};
    QCOMPARE(parent->children(), list1);

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = child == child4 ? 1 : 0;
#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
        if (expectedPaintEvents == 1 && child->numPaintEvents == 2)
            QEXPECT_FAIL(0, "Mac and Windows issues double repaints for Z-Order change", Continue);
#endif
        QTRY_COMPARE(child->numPaintEvents, expectedPaintEvents);
        QCOMPARE(child->numZOrderChangeEvents, 0);
        child->reset();
    }

    for (int i = 0; i < 5; ++i)
        child4->stackUnder(child2);
    QTest::qWait(10);

    QObjectList list2{child1, child4, child2, child3};
    QCOMPARE(parent->children(), list2);

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedPaintEvents = child == child3 ? 1 : 0;
        int expectedZOrderChangeEvents = child == child4 ? 1 : 0;
        QTRY_COMPARE(child->numPaintEvents, expectedPaintEvents);
        QTRY_COMPARE(child->numZOrderChangeEvents, expectedZOrderChangeEvents);
        child->reset();
    }

    for (int i = 0; i < 5; ++i)
        child1->stackUnder(child3);
    QTest::qWait(10);

    QObjectList list3{child4, child2, child1, child3};
    QCOMPARE(parent->children(), list3);

    for (UpdateWidget *child : std::as_const(allChildren)) {
        int expectedZOrderChangeEvents = child == child1 ? 1 : 0;
        if (child == child3) {
#ifndef Q_OS_MACOS
            QEXPECT_FAIL(0, "See QTBUG-493", Continue);
#endif
            QCOMPARE(child->numPaintEvents, 0);
        } else {
            QCOMPARE(child->numPaintEvents, 0);
        }
        QTRY_COMPARE(child->numZOrderChangeEvents, expectedZOrderChangeEvents);
        child->reset();
    }
}

void drawPolygon(QPaintDevice *dev, int w, int h)
{
    QPainter p(dev);
    p.fillRect(0, 0, w, h, Qt::white);

    QPolygon a;
    a << QPoint(0, 0) << QPoint(w/2, h/2) << QPoint(w, 0)
      << QPoint(w/2, h) << QPoint(0, 0);

    p.setPen(QPen(Qt::black, 1));
    p.setBrush(Qt::DiagCrossPattern);
    p.drawPolygon(a);
}

class ContentsPropagationWidget : public QWidget
{
    Q_OBJECT
public:
    explicit ContentsPropagationWidget(QWidget *parent = nullptr) : QWidget(parent)
    {
        setObjectName(QLatin1String("ContentsPropagationWidget"));
        setWindowTitle(objectName());
        QWidget *child = this;
        for (int i = 0; i < 32; ++i) {
            child = new QWidget(child);
            child->setGeometry(i, i, 400 - i * 2, 400 - i * 2);
        }
    }

    void setContentsPropagation(bool enable)
    {
        for (QObject *child : children())
            qobject_cast<QWidget *>(child)->setAutoFillBackground(!enable);
    }

protected:
    void paintEvent(QPaintEvent *) override
    {
        int w = width(), h = height();
        drawPolygon(this, w, h);
    }

    QSize sizeHint() const override { return {500, 500}; }
};

// Scale to remove devicePixelRatio should scaling be active.
static QPixmap grabFromWidget(QWidget *w, const QRect &rect)
{
    QPixmap pixmap = w->grab(rect);
    const qreal devicePixelRatio = pixmap.devicePixelRatio();
    if (!qFuzzyCompare(devicePixelRatio, qreal(1))) {
        pixmap = pixmap.scaled((QSizeF(pixmap.size()) / devicePixelRatio).toSize(),
                               Qt::KeepAspectRatio, Qt::SmoothTransformation);
        pixmap.setDevicePixelRatio(1);
    }
    return pixmap;
}

void tst_QWidget::testContentsPropagation()
{
    if (!qFuzzyCompare(qApp->devicePixelRatio(), qreal(1)))
        QSKIP("This test does not work with scaling.");
    ContentsPropagationWidget widget;
    widget.setFixedSize(500, 500);
    widget.setContentsPropagation(false);
    QPixmap widgetSnapshot = widget.grab(QRect(QPoint(0, 0), QSize(-1, -1)));

    QPixmap correct(500, 500);
    drawPolygon(&correct, 500, 500);
    //correct.save("correct.png", "PNG");

    //widgetSnapshot.save("snap1.png", "PNG");
    QVERIFY(widgetSnapshot.toImage() != correct.toImage());

    widget.setContentsPropagation(true);
    widgetSnapshot = widgetSnapshot = widget.grab(QRect(QPoint(0, 0), QSize(-1, -1)));
    //widgetSnapshot.save("snap2.png", "PNG");

    QCOMPARE(widgetSnapshot, correct);
}

/*
    Test that saving and restoring window geometry with
    saveGeometry() and restoreGeometry() works.
*/

void tst_QWidget::saveRestoreGeometry()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    const QPoint position = m_availableTopLeft + QPoint(100, 100);
    const QSize size = m_testWidgetSize;

    QByteArray savedGeometry;

    {
        QWidget widget;
        widget.move(position);
        widget.resize(size);
        widget.showNormal();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QApplication::processEvents();


    /* ---------------------------------------------------------------------
     * This test function is likely to flake when debugged with Qt Creator.
     * (29px offset making the following QTRY_VERIFY2 fail)
     * ---------------------------------------------------------------------
     */

        QTRY_VERIFY2(HighDpi::fuzzyCompare(widget.pos(), position, m_fuzz),
                     qPrintable(HighDpi::msgPointMismatch(widget.pos(), position)));
        QCOMPARE(widget.size(), size);
        savedGeometry = widget.saveGeometry();
    }

    {
        QWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

        const QByteArray empty;
        const QByteArray one("a");
        const QByteArray two("ab");
        const QByteArray three("abc");
        const QByteArray four("abca");
        const QByteArray garbage("abcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabcabc");

        QVERIFY(!widget.restoreGeometry(empty));
        QVERIFY(!widget.restoreGeometry(one));
        QVERIFY(!widget.restoreGeometry(two));
        QVERIFY(!widget.restoreGeometry(three));
        QVERIFY(!widget.restoreGeometry(four));
        QVERIFY(!widget.restoreGeometry(garbage));

        QVERIFY(widget.restoreGeometry(savedGeometry));
        widget.showNormal();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QApplication::processEvents();

        QVERIFY2(HighDpi::fuzzyCompare(widget.pos(), position, m_fuzz),
                 qPrintable(HighDpi::msgPointMismatch(widget.pos(), position)));
        QCOMPARE(widget.size(), size);
        widget.show();
        QVERIFY2(HighDpi::fuzzyCompare(widget.pos(), position, m_fuzz),
                 qPrintable(HighDpi::msgPointMismatch(widget.pos(), position)));
        QCOMPARE(widget.size(), size);
    }

    {
        QWidget widget;
        widget.move(position);
        widget.resize(size);
        widget.showNormal();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QTRY_COMPARE(widget.geometry().size(), size);

        QRect geom;

        //Restore from Full screen
        savedGeometry = widget.saveGeometry();
        geom = widget.geometry();
        widget.setWindowState(widget.windowState() | Qt::WindowFullScreen);
        QTRY_VERIFY((widget.windowState() & Qt::WindowFullScreen));
        QTest::qWait(500);
        QVERIFY(widget.restoreGeometry(savedGeometry));
        QTest::qWait(120);
        QTRY_VERIFY(!(widget.windowState() & Qt::WindowFullScreen));
        QTRY_COMPARE(widget.geometry(), geom);

        //Restore to full screen
        widget.setWindowState(widget.windowState() | Qt::WindowFullScreen);
        QTest::qWait(120);
        QTRY_VERIFY((widget.windowState() & Qt::WindowFullScreen));
        QTest::qWait(500);
        savedGeometry = widget.saveGeometry();
        geom = widget.geometry();
        widget.setWindowState(widget.windowState() ^ Qt::WindowFullScreen);
        QTest::qWait(120);
        QTRY_VERIFY(!(widget.windowState() & Qt::WindowFullScreen));
        QTest::qWait(400);
        QVERIFY(widget.restoreGeometry(savedGeometry));
        QTest::qWait(120);
        QTRY_VERIFY((widget.windowState() & Qt::WindowFullScreen));
        QTRY_COMPARE(widget.geometry(), geom);
        QVERIFY((widget.windowState() & Qt::WindowFullScreen));
        widget.setWindowState(widget.windowState() ^ Qt::WindowFullScreen);
        QTest::qWait(120);
        QTRY_VERIFY(!(widget.windowState() & Qt::WindowFullScreen));
        QTest::qWait(120);

        //Restore from Maximised
        widget.move(position);
        widget.resize(size);
        QTest::qWait(10);
        QTRY_COMPARE(widget.size(), size);
        QTest::qWait(500);
        savedGeometry = widget.saveGeometry();
        geom = widget.geometry();
        widget.setWindowState(widget.windowState() | Qt::WindowMaximized);
        QTest::qWait(120);
        QTRY_VERIFY((widget.windowState() & Qt::WindowMaximized));
        QTRY_VERIFY(widget.geometry() != geom);
        QTest::qWait(500);
        QVERIFY(widget.restoreGeometry(savedGeometry));
        QTest::qWait(120);
        QTRY_COMPARE(widget.geometry(), geom);

        QVERIFY(!(widget.windowState() & Qt::WindowMaximized));

        //Restore to maximised
        widget.setWindowState(widget.windowState() | Qt::WindowMaximized);
        QTest::qWait(120);
        QTRY_VERIFY((widget.windowState() & Qt::WindowMaximized));
        QTest::qWait(500);
        geom = widget.geometry();
        savedGeometry = widget.saveGeometry();
        widget.setWindowState(widget.windowState() ^ Qt::WindowMaximized);
        QTest::qWait(120);
        QTRY_VERIFY(!(widget.windowState() & Qt::WindowMaximized));
        QTest::qWait(500);
        QVERIFY(widget.restoreGeometry(savedGeometry));
        QTest::qWait(120);
        QTRY_VERIFY((widget.windowState() & Qt::WindowMaximized));
        QTRY_COMPARE(widget.geometry(), geom);
    }
}

void tst_QWidget::restoreVersion1Geometry_data()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    QTest::addColumn<QString>("fileName");
    QTest::addColumn<Qt::WindowState>("expectedWindowState");
    QTest::addColumn<QPoint>("expectedPosition");
    QTest::addColumn<QSize>("expectedSize");
    QTest::addColumn<QRect>("expectedNormalGeometry");
    const QPoint position(100, 100);
    const QSize size(200, 200);
    const QRect normalGeometry(102, 124, 200, 200);

    QTest::newRow("geometry.dat") << ":geometry.dat" << Qt::WindowNoState << position << size << normalGeometry;
    QTest::newRow("geometry-maximized.dat") << ":geometry-maximized.dat" << Qt::WindowMaximized << position << size << normalGeometry;
    QTest::newRow("geometry-fullscreen.dat") << ":geometry-fullscreen.dat" << Qt::WindowFullScreen << position << size << normalGeometry;
}

/*
    Test that the current version of restoreGeometry() can restore geometry
    saved width saveGeometry() version 1.0.
*/
void tst_QWidget::restoreVersion1Geometry()
{
    QFETCH(QString, fileName);
    QFETCH(Qt::WindowState, expectedWindowState);
    QFETCH(QPoint, expectedPosition);
    Q_UNUSED(expectedPosition);
    QFETCH(QSize, expectedSize);
    QFETCH(QRect, expectedNormalGeometry);

    if (m_platform == QLatin1String("windows") && QGuiApplication::primaryScreen()->geometry().width() > 2000)
        QSKIP("Skipping due to minimum decorated window size on Windows");

    // WindowActive is uninteresting for this test
    const Qt::WindowStates WindowStateMask = Qt::WindowFullScreen | Qt::WindowMaximized | Qt::WindowMinimized;

    QFile f(fileName);
    QVERIFY(f.exists());
    f.open(QIODevice::ReadOnly);
    const QByteArray savedGeometry = f.readAll();
    QCOMPARE(savedGeometry.size(), 46);
    f.close();

    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()) + QLatin1String("::")
                          + QLatin1String(QTest::currentDataTag()));

    QVERIFY(widget.restoreGeometry(savedGeometry));

    QCOMPARE(widget.windowState() & WindowStateMask, expectedWindowState);
    if (expectedWindowState == Qt::WindowNoState) {
        QTRY_COMPARE(widget.geometry(), expectedNormalGeometry);
        QCOMPARE(widget.size(), expectedSize);
    }

    widget.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QTest::qWait(100);

    if (expectedWindowState == Qt::WindowNoState) {
        QTRY_COMPARE(widget.size(), expectedSize);
        QCOMPARE(widget.geometry(), expectedNormalGeometry);
    }

    widget.showNormal();
    QTest::qWait(10);

    QTRY_COMPARE(widget.geometry(), expectedNormalGeometry);
    if (expectedWindowState == Qt::WindowNoState)
        QCOMPARE(widget.size(), expectedSize);

#if 0
    // Code for saving a new geometry*.dat files
    {
        QWidget widgetToSave;
        widgetToSave.move(expectedPosition);
        widgetToSave.resize(expectedSize);
        widgetToSave.show();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QTest::qWait(500); // stabilize
        widgetToSave.setWindowState(Qt::WindowStates(expectedWindowState));
        QTest::qWait(500); // stabilize

        QByteArray geometryToSave = widgetToSave.saveGeometry();

        // Code for saving a new geometry.dat file.
        f.setFileName(fileName.mid(1));
        QVERIFY(f.open(QIODevice::WriteOnly)); // did you forget to 'p4 edit *.dat'? :)
        f.write(geometryToSave);
        f.close();
    }
#endif
}

void tst_QWidget::restoreGeometryAfterScreenChange_data()
{
    QTest::addColumn<ScreenPosition>("screenPosition");
    QTest::addColumn<int>("deltaWidth");
    QTest::addColumn<int>("deltaHeight");
    QTest::addColumn<int>("frameMargin");
    QTest::addColumn<bool>("outside");

    QTest::newRow("offAboveLarge") << ScreenPosition::OffAbove << 200 << 250 << 20 << true;
    QTest::newRow("fitting") << ScreenPosition::Contained << 80 << 80 << 20 << false;
    QTest::newRow("offRightWide") << ScreenPosition::OffRight << 150 << 80 << 20 << false;
    QTest::newRow("offLeftFitting") << ScreenPosition::OffLeft << 70 << 70 << 20 << true;
    QTest::newRow("offBelowHigh") << ScreenPosition::OffBelow << 80 << 200 << 20 << false;
}

void tst_QWidget::restoreGeometryAfterScreenChange()
{
    const QList<QScreen *> &screens = QApplication::screens();
    QVERIFY2(!screens.isEmpty(), "No screens found.");
    const QRect screenGeometry = screens.at(0)->geometry();

    QFETCH(ScreenPosition, screenPosition);
    QFETCH(int, deltaWidth);
    QFETCH(int, deltaHeight);
    QFETCH(int, frameMargin);
    QFETCH(bool, outside);

    QRect restoredGeometry = screenGeometry;
    restoredGeometry.setHeight(screenGeometry.height() * deltaHeight / 100);
    restoredGeometry.setWidth(screenGeometry.width() * deltaWidth / 100);
    const float moveMargin = outside ? 1.2 : 0.75;

    switch (screenPosition) {
    case ScreenPosition::OffLeft:
        restoredGeometry.setLeft(restoredGeometry.width() * (-moveMargin));
        break;
    case ScreenPosition::OffAbove:
        restoredGeometry.setTop(restoredGeometry.height() * (-moveMargin));
        break;
    case ScreenPosition::OffRight:
        restoredGeometry.setRight(restoredGeometry.width() * moveMargin);
        break;
    case ScreenPosition::OffBelow:
        restoredGeometry.setBottom(restoredGeometry.height() * moveMargin);
        break;
    case ScreenPosition::Contained:
        break;
    }

    // If restored geometry fits into screen and has not been moved,
    // it is changed only by frame margin plus one pixel at each edge
    const QRect originalGeometry = restoredGeometry.adjusted(1, frameMargin + 1, 1, frameMargin + 1);

    QWidgetPrivate::checkRestoredGeometry(screenGeometry, &restoredGeometry, frameMargin);

    if (deltaHeight < 100 && deltaWidth < 100 && screenPosition == ScreenPosition::Contained)
        QCOMPARE(originalGeometry, restoredGeometry);

    // new geometry has to fit on the screen
    QVERIFY(screenGeometry.contains(restoredGeometry));
}

void tst_QWidget::widgetAt()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    if (m_platform == QStringLiteral("offscreen"))
        QSKIP("Platform offscreen does not support lower()/raise() or WindowMasks");

    Q_CHECK_PAINTEVENTS

    const QPoint referencePos = m_availableTopLeft + QPoint(100, 100);
    QScopedPointer<QWidget> w1(new QWidget(nullptr, Qt::X11BypassWindowManagerHint));
    w1->setGeometry(QRect(referencePos, QSize(m_testWidgetSize.width(), 150)));
    w1->setObjectName(QLatin1String("w1"));
    w1->setWindowTitle(w1->objectName());
    QScopedPointer<QWidget> w2(new QWidget(nullptr, Qt::X11BypassWindowManagerHint | Qt::FramelessWindowHint));
    w2->setGeometry(QRect(referencePos + QPoint(50, 50), QSize(m_testWidgetSize.width(), 100)));
    w2->setObjectName(QLatin1String("w2"));
    w2->setWindowTitle(w2->objectName());
    w1->showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(w1.data()));
    const QPoint testPos = referencePos + QPoint(100, 100);
    QWidget *wr;
    QTRY_VERIFY((wr = QApplication::widgetAt((testPos))));
    QCOMPARE(wr->objectName(), QString("w1"));

    w2->showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(w2.data()));
    QTRY_VERIFY((wr = QApplication::widgetAt(testPos)));
    QCOMPARE(wr->objectName(), QString("w2"));

    w2->lower();
    QTRY_VERIFY((wr = QApplication::widgetAt(testPos)) && wr->objectName() == QString("w1"));
    w2->raise();

    QTRY_VERIFY((wr = QApplication::widgetAt(testPos)) && wr->objectName() == QString("w2"));

    QWidget *w3 = new QWidget(w2.data());
    w3->setGeometry(10,10,50,50);
    w3->setObjectName("w3");
    w3->showNormal();
    QTRY_VERIFY((wr = QApplication::widgetAt(testPos)) && wr->objectName() == QString("w3"));

    w3->setAttribute(Qt::WA_TransparentForMouseEvents);
    QTRY_VERIFY((wr = QApplication::widgetAt(testPos)) && wr->objectName() == QString("w2"));

    if (!QGuiApplicationPrivate::platformIntegration()
                               ->hasCapability(QPlatformIntegration::WindowMasks)) {
        QSKIP("Platform does not support WindowMasks");
    }

    QRegion rgn = QRect(QPoint(0,0), w2->size());
    QPoint point = w2->mapFromGlobal(testPos);
    rgn -= QRect(point, QSize(1,1));
    w2->setMask(rgn);

    QTRY_VERIFY((wr = QApplication::widgetAt(testPos)));
    QTRY_COMPARE(wr->objectName(), w1->objectName());
    QTRY_VERIFY((wr = QApplication::widgetAt(testPos + QPoint(1, 1))));
    QTRY_COMPARE(wr->objectName(), w2->objectName());

    QBitmap bitmap(w2->size());
    QPainter p(&bitmap);
    p.fillRect(bitmap.rect(), Qt::color1);
    p.setPen(Qt::color0);
    p.drawPoint(w2->mapFromGlobal(testPos));
    p.end();
    w2->setMask(bitmap);
    QTRY_COMPARE(QApplication::widgetAt(testPos), w1.data());
    QTRY_VERIFY(QApplication::widgetAt(testPos + QPoint(1, 1)) == w2.data());
}

void tst_QWidget::task110173()
{
    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

    QPushButton *pb1 = new QPushButton("click", &w);
    pb1->setFocusPolicy(Qt::ClickFocus);
    pb1->move(100, 100);

    QPushButton *pb2 = new QPushButton("push", &w);
    pb2->setFocusPolicy(Qt::ClickFocus);
    pb2->move(300, 300);

    QTest::keyClick( &w, Qt::Key_Tab );
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
}

class Widget : public QWidget
{
public:
    Widget() { setFocusPolicy(Qt::StrongFocus); }
    void actionEvent(QActionEvent *) override { if (deleteThis) delete this; }
    void changeEvent(QEvent *) override { if (deleteThis) delete this; }
    void closeEvent(QCloseEvent *) override { if (deleteThis) delete this; }
    void hideEvent(QHideEvent *) override { if (deleteThis) delete this; }
    void focusOutEvent(QFocusEvent *) override { if (deleteThis) delete this; }
    void keyPressEvent(QKeyEvent *) override { if (deleteThis) delete this; }
    void keyReleaseEvent(QKeyEvent *) override { if (deleteThis) delete this; }
    void mouseDoubleClickEvent(QMouseEvent *) override { if (deleteThis) delete this; }
    void mousePressEvent(QMouseEvent *) override { if (deleteThis) delete this; }
    void mouseReleaseEvent(QMouseEvent *) override { if (deleteThis) delete this; }
    void mouseMoveEvent(QMouseEvent *) override { if (deleteThis) delete this; }

    bool deleteThis = false;
};

void tst_QWidget::testDeletionInEventHandlers()
{
    // closeEvent
    QPointer<Widget> w = new Widget;
    w->deleteThis = true;
    w->close();
    QVERIFY(w.isNull());
    delete w;

    // focusOut (crashes)
    //w = new Widget;
    //w->show();
    //w->setFocus();
    //QCOMPARE(qApp->focusWidget(), w);
    //w->deleteThis = true;
    //w->clearFocus();
    //QVERIFY(w.isNull());

    // key press
    w = new Widget;
    w->show();
    w->deleteThis = true;
    QTest::keyPress(w, Qt::Key_A);
    QVERIFY(w.isNull());
    delete w;

    // key release
    w = new Widget;
    w->show();
    w->deleteThis = true;
    QTest::keyRelease(w, Qt::Key_A);
    QVERIFY(w.isNull());
    delete w;

    // mouse press
    w = new Widget;
    w->show();
    w->deleteThis = true;
    QTest::mousePress(w, Qt::LeftButton);
    QVERIFY(w.isNull());
    delete w;

    // mouse release
    w = new Widget;
    w->show();
    w->deleteThis = true;
    QMouseEvent me(QEvent::MouseButtonRelease, QPoint(1, 1), w->mapToGlobal(QPoint(1, 1)),
                   Qt::LeftButton, Qt::LeftButton, Qt::KeyboardModifiers());
    qApp->notify(w, &me);
    QVERIFY(w.isNull());
    delete w;

    // mouse double click
    w = new Widget;
    w->show();
    w->deleteThis = true;
    QTest::mouseDClick(w, Qt::LeftButton);
    QVERIFY(w.isNull());
    delete w;

    // hide event (crashes)
    //w = new Widget;
    //w->show();
    //w->deleteThis = true;
    //w->hide();
    //QVERIFY(w.isNull());

    // action event
    w = new Widget;
    w->deleteThis = true;
    w->addAction(new QAction(w));
    QVERIFY(w.isNull());
    delete w;

    // change event
    w = new Widget;
    w->show();
    w->deleteThis = true;
    w->setMouseTracking(true);
    QVERIFY(w.isNull());
    delete w;

    w = new Widget;
    w->setMouseTracking(true);
    w->show();
    w->deleteThis = true;
    QMouseEvent me2 = QMouseEvent(QEvent::MouseMove, QPoint(0, 0), w->mapToGlobal(QPoint(0, 0)),
                                  Qt::NoButton, Qt::NoButton, Qt::NoModifier);
    QApplication::sendEvent(w, &me2);
    QVERIFY(w.isNull());
    delete w;
}

#ifdef Q_OS_MACOS
class MaskedPainter : public QWidget
{
public:
    QRect mask;

    MaskedPainter()
    : mask(20, 20, 50, 50)
    {
        setMask(mask);
    }

    void paintEvent(QPaintEvent *)
    {
        QPainter p(this);
        p.fillRect(mask, QColor(Qt::red));
    }
};

/*
    Verifies that the entire area inside the mask is painted red.
*/
bool verifyWidgetMask(QWidget *widget, QRect mask)
{
    const QImage image = widget->grab(QRect(QPoint(0, 0), widget->size())).toImage();

    const QImage masked = image.copy(mask);
    QImage red(masked);
    red.fill(QColor(Qt::red).rgb());

    return (masked == red);
}

void tst_QWidget::setMask()
{
    {
        MaskedPainter w;
        w.resize(200, 200);
        w.show();
        QTest::qWait(100);
        QVERIFY(verifyWidgetMask(&w, w.mask));
    }
    {
        MaskedPainter w;
        w.resize(200, 200);
        w.setWindowFlags(w.windowFlags() | Qt::FramelessWindowHint);
        w.show();
        QTest::qWait(100);
        QRect mask = w.mask;

        QVERIFY(verifyWidgetMask(&w, mask));
    }
}
#endif

class StaticWidget : public QWidget
{
Q_OBJECT
public:
    bool partial = false;
    QRegion paintedRegion;

    explicit StaticWidget(const QPalette &palette, QWidget *parent = nullptr) : QWidget(parent)
    {
        setAttribute(Qt::WA_StaticContents);
        setAttribute(Qt::WA_OpaquePaintEvent);
        setPalette(palette);
        setAutoFillBackground(true);
    }

    void paintEvent(QPaintEvent *e) override
    {
        paintedRegion += e->region();
        ++paintEvents;
        // Look for a full update, set partial to false if found.
        for (QRect r : e->region()) {
            partial = (r != rect());
            if (!partial)
                break;
        }
    }

    // Wait timeout ms until at least one paint event has been consumed
    // and the counter is no longer increasing.
    // => making sure to consume multiple paint events relating to one operation
    // before returning true.
    bool waitForPaintEvent(int timeout = 100)
    {
        QDeadlineTimer deadline(timeout);
        int count = -1;
        while (!deadline.hasExpired() && count != paintEvents) {
            count = paintEvents;
            QCoreApplication::processEvents();
            if (count == paintEvents && count > 0) {
                paintEvents = 0;
                return true;
            }
        }
        paintEvents = 0;
        return false;
    }
private:
    int paintEvents = 0;
};

/*
    Test that widget resizes and moves can be done with minimal repaints when WA_StaticContents
    and WA_OpaquePaintEvent is set.
*/
void tst_QWidget::optimizedResizeMove()
{
    const bool wayland = QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive);

    QWidget parent;
    parent.setPalette(simplePalette());
    parent.setWindowTitle(QTest::currentTestFunction());
    parent.resize(400, 400);

    StaticWidget staticWidget(simplePalette(), &parent);
    staticWidget.move(150, 150);
    staticWidget.resize(150, 150);
    parent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));
    QVERIFY(staticWidget.waitForPaintEvent());

    staticWidget.move(staticWidget.pos() + QPoint(10, 10));
    if (!wayland) {
        QVERIFY(!staticWidget.waitForPaintEvent());
    } else {
        if (staticWidget.waitForPaintEvent())
            QSKIP("Wayland is not optimising paint events. Skipping test.");
    }

    staticWidget.move(staticWidget.pos() + QPoint(-10, -10));
    QVERIFY(!staticWidget.waitForPaintEvent());

    staticWidget.move(staticWidget.pos() + QPoint(-10, 10));
    QVERIFY(!staticWidget.waitForPaintEvent());

    staticWidget.resize(staticWidget.size() + QSize(10, 10));
    QVERIFY(staticWidget.waitForPaintEvent());
    QCOMPARE(staticWidget.partial, true);

    staticWidget.resize(staticWidget.size() + QSize(-10, -10));
    QVERIFY(!staticWidget.waitForPaintEvent());

    staticWidget.resize(staticWidget.size() + QSize(10, -10));
    QVERIFY(staticWidget.waitForPaintEvent());
    QCOMPARE(staticWidget.partial, true);

    staticWidget.move(staticWidget.pos() + QPoint(10, 10));
    staticWidget.resize(staticWidget.size() + QSize(-10, -10));
    QVERIFY(!staticWidget.waitForPaintEvent());

    staticWidget.move(staticWidget.pos() + QPoint(10, 10));
    staticWidget.resize(staticWidget.size() + QSize(10, 10));
    QVERIFY(staticWidget.waitForPaintEvent());
    QCOMPARE(staticWidget.partial, true);

    staticWidget.move(staticWidget.pos() + QPoint(-10, -10));
    staticWidget.resize(staticWidget.size() + QSize(-10, -10));
    QVERIFY(!staticWidget.waitForPaintEvent());

    staticWidget.setAttribute(Qt::WA_StaticContents, false);
    staticWidget.move(staticWidget.pos() + QPoint(-10, -10));
    staticWidget.resize(staticWidget.size() + QSize(-10, -10));
    QVERIFY(staticWidget.waitForPaintEvent());
    QCOMPARE(staticWidget.partial, false);
    staticWidget.setAttribute(Qt::WA_StaticContents, true);

    staticWidget.setAttribute(Qt::WA_StaticContents, false);
    staticWidget.move(staticWidget.pos() + QPoint(10, 10));
    QVERIFY(!staticWidget.waitForPaintEvent());
    staticWidget.setAttribute(Qt::WA_StaticContents, true);
}

void tst_QWidget::optimizedResize_topLevel()
{
    const bool wayland = QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive);

    if (QHighDpiScaling::isActive())
        QSKIP("Skip due to rounding errors in the regions.");
    StaticWidget topLevel(simplePalette());
    topLevel.setPalette(simplePalette());
    topLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QVERIFY(topLevel.waitForPaintEvent());

    topLevel.partial = false;
    topLevel.paintedRegion = QRegion();

#if !defined(Q_OS_WIN32)
    topLevel.resize(topLevel.size() + QSize(10, 10));
#else
    // Static contents does not work when programmatically resizing
    // top-levels with QWidget::resize. We do some funky stuff in
    // setGeometry_sys. However, resizing it with the mouse or with
    // a native function call works (it basically has to go through
    // WM_RESIZE in QApplication). This is a corner case, though.
    // See task 243708
    RECT rect;
    GetWindowRect(winHandleOf(&topLevel), &rect);
    MoveWindow(winHandleOf(&topLevel), rect.left, rect.top,
               rect.right - rect.left + 10, rect.bottom - rect.top + 10,
               true);
    QTest::qWait(100);
#endif

    // Expected update region: New rect - old rect.
    QRegion expectedUpdateRegion(topLevel.rect());
    expectedUpdateRegion -= QRect(QPoint(), topLevel.size() - QSize(10, 10));

    QVERIFY(topLevel.waitForPaintEvent());
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("offscreen"))
        QSKIP("QTBUG-26424");
    if (!wayland) {
        QCOMPARE(topLevel.partial, true);
    } else {
        if (!topLevel.partial)
            QSKIP("Wayland does repaint partially. Skipping test.");
    }
    QCOMPARE(topLevel.paintedRegion, expectedUpdateRegion);
}

class SiblingDeleter : public QWidget
{
public:
    inline SiblingDeleter(QWidget *sibling, QWidget *parent)
        : QWidget(parent), sibling(sibling) {}
    inline ~SiblingDeleter() { delete sibling; }

private:
    QPointer<QWidget> sibling;
};


void tst_QWidget::childDeletesItsSibling()
{
    auto commonParent = new QWidget(nullptr);
    QPointer<QWidget> child(new QWidget(nullptr));
    QPointer<QWidget> siblingDeleter = new SiblingDeleter(child, commonParent);
    child->setParent(commonParent);
    delete commonParent; // don't crash
    QVERIFY(!child);
    QVERIFY(!siblingDeleter);

}

void tst_QWidget::setMinimumSize()
{
    QWidget w;
    QSize defaultSize = w.size();

    w.setMinimumSize(defaultSize + QSize(100, 100));
    QCOMPARE(w.size(), defaultSize + QSize(100, 100));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setMinimumSize(defaultSize + QSize(50, 50));
    QCOMPARE(w.size(), defaultSize + QSize(100, 100));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setMinimumSize(defaultSize + QSize(200, 200));
    QCOMPARE(w.size(), defaultSize + QSize(200, 200));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    QSize nonDefaultSize = defaultSize + QSize(5,5);
    w.setMinimumSize(nonDefaultSize);
    w.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    QVERIFY2(w.height() >= nonDefaultSize.height(),
             msgComparisonFailed(w.height(), ">=", nonDefaultSize.height()));
    QVERIFY2(w.width() >= nonDefaultSize.width(),
             msgComparisonFailed(w.width(), ">=", nonDefaultSize.width()));
}

void tst_QWidget::setMaximumSize()
{
    QWidget w;
    QSize defaultSize = w.size();

    w.setMinimumSize(defaultSize + QSize(100, 100));
    QCOMPARE(w.size(), defaultSize + QSize(100, 100));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));
    w.setMinimumSize(defaultSize);

    w.setMaximumSize(defaultSize + QSize(200, 200));
    QCOMPARE(w.size(), defaultSize + QSize(100, 100));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setMaximumSize(defaultSize + QSize(50, 50));
    QCOMPARE(w.size(), defaultSize + QSize(50, 50));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));
}

void tst_QWidget::setFixedSize()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QWidget w;
    QSize defaultSize = w.size();

    w.setFixedSize(defaultSize + QSize(100, 100));
    QCOMPARE(w.size(), defaultSize + QSize(100, 100));
    QVERIFY(w.testAttribute(Qt::WA_Resized));

    w.setFixedSize(defaultSize + QSize(200, 200));

    QCOMPARE(w.minimumSize(), defaultSize + QSize(200,200));
    QCOMPARE(w.maximumSize(), defaultSize + QSize(200,200));
    QCOMPARE(w.size(), defaultSize + QSize(200, 200));
    QVERIFY(w.testAttribute(Qt::WA_Resized));

    w.setFixedSize(defaultSize + QSize(50, 50));
    QCOMPARE(w.size(), defaultSize + QSize(50, 50));
    QVERIFY(w.testAttribute(Qt::WA_Resized));

    w.setAttribute(Qt::WA_Resized, false);
    w.setFixedSize(defaultSize + QSize(50, 50));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setFixedSize(defaultSize + QSize(150, 150));
    w.showNormal();
    QVERIFY(QTest::qWaitForWindowActive(&w));
    if (m_platform == QStringLiteral("xcb"))
        QSKIP("QTBUG-26424");
    QCOMPARE(w.size(), defaultSize + QSize(150,150));
}

void tst_QWidget::ensureCreated()
{
    {
        QWidget widget;
        WId widgetWinId = widget.winId();
        Q_UNUSED(widgetWinId);
        QVERIFY(widget.testAttribute(Qt::WA_WState_Created));
    }

    {
        QWidget window;

        QDialog dialog(&window);
        dialog.setWindowModality(Qt::NonModal);

        WId dialogWinId = dialog.winId();
        Q_UNUSED(dialogWinId);
        QVERIFY(dialog.testAttribute(Qt::WA_WState_Created));
        QVERIFY(window.testAttribute(Qt::WA_WState_Created));
    }

    {
        QWidget window;

        QDialog dialog(&window);
        dialog.setWindowModality(Qt::WindowModal);

        WId dialogWinId = dialog.winId();
        Q_UNUSED(dialogWinId);
        QVERIFY(dialog.testAttribute(Qt::WA_WState_Created));
        QVERIFY(window.testAttribute(Qt::WA_WState_Created));
    }

    {
        QWidget window;

        QDialog dialog(&window);
        dialog.setWindowModality(Qt::ApplicationModal);

        WId dialogWinId = dialog.winId();
        Q_UNUSED(dialogWinId);
        QVERIFY(dialog.testAttribute(Qt::WA_WState_Created));
        QVERIFY(window.testAttribute(Qt::WA_WState_Created));
    }
}

class WinIdChangeWidget : public QWidget
{
public:
    using QWidget::QWidget;
protected:
    bool event(QEvent *e) override
    {
        if (e->type() == QEvent::WinIdChange) {
            m_winIdList.append(internalWinId());
            return true;
        }
        return QWidget::event(e);
    }
public:
    QList<WId> m_winIdList;
    int winIdChangeEventCount() const { return m_winIdList.size(); }
};

class CreateDestroyWidget : public WinIdChangeWidget
{
public:
    void create() { QWidget::create(); }
    void destroy() { QWidget::destroy(); }
};

void tst_QWidget::createAndDestroy()
{
    CreateDestroyWidget widget;

    // Create and destroy via QWidget
    widget.create();
    QVERIFY(widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 1);
    QVERIFY(widget.internalWinId());

    widget.destroy();
    QVERIFY(!widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 2);
    QVERIFY(!widget.internalWinId());

    // Create via QWidget, destroy via QWindow
    widget.create();
    QVERIFY(widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 3);
    QVERIFY(widget.internalWinId());

    widget.windowHandle()->destroy();
    QVERIFY(!widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 4);
    QVERIFY(!widget.internalWinId());

    // Create via QWidget again
    widget.create();
    QVERIFY(widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 5);
    QVERIFY(widget.internalWinId());

    // Destroy via QWindow, create via QWindow
    widget.windowHandle()->destroy();
    QVERIFY(widget.windowHandle());
    QVERIFY(!widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 6);
    QVERIFY(!widget.internalWinId());

    widget.windowHandle()->create();
    QVERIFY(widget.testAttribute(Qt::WA_WState_Created));
    QCOMPARE(widget.winIdChangeEventCount(), 7);
    QVERIFY(widget.internalWinId());
}

void tst_QWidget::eventsAndAttributesOnDestroy()
{
    // The events and attributes when destroying a widget should
    // include those of hiding the widget.

    CreateDestroyWidget widget;
    EventSpy<QWidget> showEventSpy(&widget, QEvent::Show);
    EventSpy<QWidget> hideEventSpy(&widget, QEvent::Hide);

    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), false);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), false);
    QCOMPARE(widget.testAttribute(Qt::WA_Mapped), false);

    widget.show();
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), true);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), true);
    QTRY_COMPARE(widget.testAttribute(Qt::WA_Mapped), true);
    QCOMPARE(showEventSpy.count(), 1);
    QCOMPARE(hideEventSpy.count(), 0);

    widget.hide();
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), true);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), false);
    QCOMPARE(widget.testAttribute(Qt::WA_Mapped), false);
    QCOMPARE(showEventSpy.count(), 1);
    QCOMPARE(hideEventSpy.count(), 1);

    widget.show();
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), true);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), true);
    QTRY_COMPARE(widget.testAttribute(Qt::WA_Mapped), true);
    QCOMPARE(showEventSpy.count(), 2);
    QCOMPARE(hideEventSpy.count(), 1);

    widget.destroy();
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), false);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), false);
    QCOMPARE(widget.testAttribute(Qt::WA_Mapped), false);
    QCOMPARE(showEventSpy.count(), 2);
    QCOMPARE(hideEventSpy.count(), 2);

    const int hideEventsAfterDestroy = hideEventSpy.count();

    widget.create();
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), true);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), false);
    QCOMPARE(widget.testAttribute(Qt::WA_Mapped), false);
    QCOMPARE(showEventSpy.count(), 2);
    QCOMPARE(hideEventSpy.count(), hideEventsAfterDestroy);

    QWidgetPrivate::get(&widget)->setVisible(true);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Created), true);
    QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), true);
    QTRY_COMPARE(widget.testAttribute(Qt::WA_Mapped), true);
    QCOMPARE(showEventSpy.count(), 3);
    QCOMPARE(hideEventSpy.count(), hideEventsAfterDestroy);

    // Make sure the destroy that happens when a top level
    // is moved to being a child does not prevent the child
    // being shown again.

    QWidget parent;
    QWidget child;
    parent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));
    child.show();
    QVERIFY(QTest::qWaitForWindowExposed(&child));

    child.setParent(&parent);
    QCOMPARE(child.testAttribute(Qt::WA_WState_Created), false);
    QCOMPARE(child.testAttribute(Qt::WA_WState_Visible), false);

    child.show();
    QCOMPARE(child.testAttribute(Qt::WA_WState_Created), true);
    QCOMPARE(child.testAttribute(Qt::WA_WState_Visible), true);
    QVERIFY(QTest::qWaitForWindowExposed(&child));
}

void tst_QWidget::winIdChangeEvent()
{
    {
        // Transforming an alien widget into a native widget
        WinIdChangeWidget widget;
        const WId winIdBefore = widget.internalWinId();
        const WId winIdAfter = widget.winId();
        QVERIFY(winIdBefore != winIdAfter);
        QCOMPARE(widget.winIdChangeEventCount(), 1);
    }

    {
        // Changing parent of a native widget
        QWidget parent1, parent2;
        WinIdChangeWidget child(&parent1);
        const WId winIdBefore = child.winId();
        QCOMPARE(child.winIdChangeEventCount(), 1);
        child.setParent(&parent2);
        const WId winIdAfter = child.internalWinId();
        QCOMPARE(winIdBefore, winIdAfter);
        QCOMPARE(child.winIdChangeEventCount(), 3);
        // winId is set to zero during reparenting
        QCOMPARE(WId(0), child.m_winIdList[1]);
    }

    {
        // Changing grandparent of a native widget
        QWidget grandparent1, grandparent2;
        QWidget parent(&grandparent1);
        WinIdChangeWidget child(&parent);
        const WId winIdBefore = child.winId();
        QCOMPARE(child.winIdChangeEventCount(), 1);
        parent.setParent(&grandparent2);
        const WId winIdAfter = child.internalWinId();
        QCOMPARE(winIdBefore, winIdAfter);
        QCOMPARE(child.winIdChangeEventCount(), 1);
    }

    {
        // Changing parent of an alien widget
        QWidget parent1, parent2;
        WinIdChangeWidget child(&parent1);
        const WId winIdBefore = child.internalWinId();
        child.setParent(&parent2);
        const WId winIdAfter = child.internalWinId();
        QCOMPARE(winIdBefore, winIdAfter);
        QCOMPARE(child.winIdChangeEventCount(), 0);
    }

    {
        // Making native child widget into a top-level window
        QWidget parent;
        WinIdChangeWidget child(&parent);
        child.winId();
        const WId winIdBefore = child.internalWinId();
        QCOMPARE(child.winIdChangeEventCount(), 1);
        const Qt::WindowFlags flags = child.windowFlags();
        child.setWindowFlags(flags | Qt::Window);
        const WId winIdAfter = child.internalWinId();
        QCOMPARE(winIdBefore, winIdAfter);
        QCOMPARE(child.winIdChangeEventCount(), 3);
        // winId is set to zero during reparenting
        QCOMPARE(WId(0), child.m_winIdList[1]);
    }
}

void tst_QWidget::persistentWinId()
{
    QScopedPointer<QWidget> parent(new QWidget);
    QWidget *w1 = new QWidget;
    QWidget *w2 = new QWidget;
    QWidget *w3 = new QWidget;
    w1->setParent(parent.data());
    w2->setParent(w1);
    w3->setParent(w2);

    WId winId1 = w1->winId();
    WId winId2 = w2->winId();
    WId winId3 = w3->winId();

    // reparenting should preserve the winId of the widget being reparented and of its children
    w1->setParent(nullptr);
    QCOMPARE(w1->winId(), winId1);
    QCOMPARE(w2->winId(), winId2);
    QCOMPARE(w3->winId(), winId3);

    w1->setParent(parent.data());
    QCOMPARE(w1->winId(), winId1);
    QCOMPARE(w2->winId(), winId2);
    QCOMPARE(w3->winId(), winId3);

    w2->setParent(nullptr);
    QCOMPARE(w2->winId(), winId2);
    QCOMPARE(w3->winId(), winId3);

    w2->setParent(parent.data());
    QCOMPARE(w2->winId(), winId2);
    QCOMPARE(w3->winId(), winId3);

    w2->setParent(w1);
    QCOMPARE(w2->winId(), winId2);
    QCOMPARE(w3->winId(), winId3);

    w3->setParent(nullptr);
    QCOMPARE(w3->winId(), winId3);

    w3->setParent(w1);
    QCOMPARE(w3->winId(), winId3);

    w3->setParent(w2);
    QCOMPARE(w3->winId(), winId3);
}

void tst_QWidget::transientParent()
{
    QWidget topLevel;
    topLevel.setGeometry(QRect(m_availableTopLeft + QPoint(100, 100), m_testWidgetSize));
    topLevel.setWindowTitle(__FUNCTION__);
    QWidget *child = new QWidget(&topLevel);
    QMenu *menu = new QMenu(child); // QTBUG-41898: Use top level as transient parent for native widgets as well.
    QToolButton *toolButton = new QToolButton(child);
    toolButton->setMenu(menu);
    toolButton->winId();
    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QCOMPARE(menu->windowHandle()->transientParent(), topLevel.windowHandle());
}

void tst_QWidget::showNativeChild()
{
    QWidget topLevel;
    topLevel.setGeometry(QRect(m_availableTopLeft + QPoint(100, 100), m_testWidgetSize));
    topLevel.setWindowTitle(__FUNCTION__);
    QWidget child(&topLevel);
    child.winId();
    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
}

void tst_QWidget::closeAndShowNativeChild()
{
    QWidget topLevel;
    QWidget *nativeChild = new QWidget;
    nativeChild->winId();
    nativeChild->setFixedSize(200, 200);

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(nativeChild);
    topLevel.setLayout(layout);

    topLevel.show();
    QVERIFY(!nativeChild->isHidden());
    nativeChild->close();
    QVERIFY(nativeChild->isHidden());
    nativeChild->show();
    QVERIFY(!nativeChild->isHidden());
}

void tst_QWidget::closeAndShowWithNativeChild()
{
    bool dontCreateNativeWidgetSiblings = QApplication::testAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
    auto resetAttribute = qScopeGuard([&]{
        QApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings, dontCreateNativeWidgetSiblings);
    });
    QApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);

    QWidget topLevel;
    topLevel.setObjectName("TopLevel");
    QWidget *nativeChild = new QWidget;
    nativeChild->setObjectName("NativeChild");
    nativeChild->setFixedSize(200, 200);
    QWidget *normalChild = new QWidget;
    normalChild->setObjectName("NormalChild");
    normalChild->setFixedSize(200, 200);

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(nativeChild);
    layout->addWidget(normalChild);
    topLevel.setLayout(layout);

    nativeChild->setAttribute(Qt::WA_NativeWindow);

    QCOMPARE(normalChild->testAttribute(Qt::WA_WState_Hidden), false);
    QCOMPARE(normalChild->testAttribute(Qt::WA_WState_ExplicitShowHide), false);

    QCOMPARE(nativeChild->testAttribute(Qt::WA_WState_Hidden), false);
    QCOMPARE(nativeChild->testAttribute(Qt::WA_WState_ExplicitShowHide), false);

    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    const QSize originalSize = topLevel.size();
    topLevel.close();

    // all children must have the same state
    QCOMPARE(nativeChild->isHidden(), normalChild->isHidden());
    QCOMPARE(nativeChild->isVisible(), normalChild->isVisible());
    QCOMPARE(nativeChild->testAttribute(Qt::WA_WState_Visible),
             normalChild->testAttribute(Qt::WA_WState_Visible));
    QCOMPARE(nativeChild->testAttribute(Qt::WA_WState_Hidden),
             normalChild->testAttribute(Qt::WA_WState_Hidden));
    QCOMPARE(nativeChild->testAttribute(Qt::WA_WState_ExplicitShowHide),
             normalChild->testAttribute(Qt::WA_WState_ExplicitShowHide));

    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QCOMPARE(topLevel.size(), originalSize);
}

class ShowHideEventWidget : public QWidget
{
public:
    int numberOfShowEvents = 0, numberOfHideEvents = 0;
    int numberOfSpontaneousShowEvents = 0, numberOfSpontaneousHideEvents = 0;

    using QWidget::QWidget;
    using QWidget::create;

    void showEvent(QShowEvent *e) override
    {
        ++numberOfShowEvents;
        if (e->spontaneous())
            ++numberOfSpontaneousShowEvents;
    }

    void hideEvent(QHideEvent *e) override
    {
        ++numberOfHideEvents;
        if (e->spontaneous())
            ++numberOfSpontaneousHideEvents;
    }
};

void tst_QWidget::showHideEvent_data()
{
    QTest::addColumn<bool>("show");
    QTest::addColumn<bool>("hide");
    QTest::addColumn<bool>("create");
    QTest::addColumn<int>("expectedShowEvents");
    QTest::addColumn<int>("expectedHideEvents");

    QTest::newRow("window: only show")
            << true
            << false
            << false
            << 1
            << 0;
    QTest::newRow("window: show/hide")
            << true
            << true
            << false
            << 1
            << 1;
    QTest::newRow("window: show/hide/create")
            << true
            << true
            << true
            << 1
            << 1;
    QTest::newRow("window: hide/create")
            << false
            << true
            << true
            << 0
            << 0;
    QTest::newRow("window: only hide")
            << false
            << true
            << false
            << 0
            << 0;
    QTest::newRow("window: nothing")
            << false
            << false
            << false
            << 0
            << 0;
}

void tst_QWidget::showHideEvent()
{
    QFETCH(bool, show);
    QFETCH(bool, hide);
    QFETCH(bool, create);
    QFETCH(int, expectedShowEvents);
    QFETCH(int, expectedHideEvents);

    ShowHideEventWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    if (show)
        widget.show();
    if (hide)
        widget.hide();
    if (create && !widget.testAttribute(Qt::WA_WState_Created))
        widget.create();

    QCOMPARE(widget.numberOfShowEvents, expectedShowEvents);
    QCOMPARE(widget.numberOfHideEvents, expectedHideEvents);
}

void tst_QWidget::showHideEventWhileMinimize()
{
    const QPlatformIntegration *pi = QGuiApplicationPrivate::platformIntegration();
    if (!pi->hasCapability(QPlatformIntegration::MultipleWindows)
        || !pi->hasCapability(QPlatformIntegration::NonFullScreenWindows)
        || !pi->hasCapability(QPlatformIntegration::WindowManagement)) {
        QSKIP("This test requires window management capabilities");
    }
    // QTBUG-41312, hide, show events should be received during minimized.
    ShowHideEventWidget widget;
    widget.setWindowTitle(__FUNCTION__);
    widget.resize(m_testWidgetSize);
    centerOnScreen(&widget);
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    const int showEventsBeforeMinimize = widget.numberOfShowEvents;
    const int hideEventsBeforeMinimize = widget.numberOfHideEvents;
    widget.showMinimized();
    QTRY_COMPARE(widget.numberOfHideEvents, hideEventsBeforeMinimize + 1);
    widget.showNormal();
    QTRY_COMPARE(widget.numberOfShowEvents, showEventsBeforeMinimize + 1);
}

void tst_QWidget::showHideChildrenWhileMinimize_QTBUG50589()
{
    const QPlatformIntegration *pi = QGuiApplicationPrivate::platformIntegration();
    if (!pi->hasCapability(QPlatformIntegration::MultipleWindows)
        || !pi->hasCapability(QPlatformIntegration::NonFullScreenWindows)
        || !pi->hasCapability(QPlatformIntegration::WindowManagement)) {
        QSKIP("This test requires window management capabilities");
    }

    QWidget parent;
    ShowHideEventWidget child(&parent);

    parent.setWindowTitle(QTest::currentTestFunction());
    parent.resize(m_testWidgetSize);
    centerOnScreen(&parent);
    parent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));

    const int showEventsBeforeMinimize = child.numberOfSpontaneousShowEvents;
    const int hideEventsBeforeMinimize = child.numberOfSpontaneousHideEvents;
    parent.showMinimized();
    QTRY_COMPARE(child.numberOfSpontaneousHideEvents, hideEventsBeforeMinimize + 1);
    parent.showNormal();
    QTRY_COMPARE(child.numberOfSpontaneousShowEvents, showEventsBeforeMinimize + 1);
}

void tst_QWidget::update()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    Q_CHECK_PAINTEVENTS

    UpdateWidget w;
    w.setPalette(simplePalette());
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.resize(100, 100);
    centerOnScreen(&w);
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));

    QTRY_COMPARE(w.numPaintEvents, 1);

    QCOMPARE(w.visibleRegion(), QRegion(w.rect()));
    QCOMPARE(w.paintedRegion, w.visibleRegion());
    w.reset();

    UpdateWidget child(&w);
    child.setPalette(simplePalette());
    child.setGeometry(10, 10, 80, 80);
    child.show();

    QPoint childOffset = child.mapToParent(QPoint());

    // widgets are transparent by default, so both should get repaints
    {
        QApplication::processEvents();
        QApplication::processEvents();
        QCOMPARE(child.numPaintEvents, 1);
        QCOMPARE(child.visibleRegion(), QRegion(child.rect()));
        QCOMPARE(child.paintedRegion, child.visibleRegion());
        QCOMPARE(w.numPaintEvents, 1);
        QCOMPARE(w.visibleRegion(), QRegion(w.rect()));
        QCOMPARE(w.paintedRegion, child.visibleRegion().translated(childOffset));

        w.reset();
        child.reset();

        w.update();
        QApplication::processEvents();
        QApplication::processEvents();
        QCOMPARE(child.numPaintEvents, 1);
        QCOMPARE(child.visibleRegion(), QRegion(child.rect()));
        QCOMPARE(child.paintedRegion, child.visibleRegion());
        QCOMPARE(w.numPaintEvents, 1);
        QCOMPARE(w.visibleRegion(), QRegion(w.rect()));
        QCOMPARE(w.paintedRegion, w.visibleRegion());
    }

    QPalette opaquePalette = child.palette();
    opaquePalette.setColor(child.backgroundRole(), QColor(Qt::red));

    // setting an opaque background on the child should prevent paint-events
    // for the parent in the child area
    {
        child.setPalette(opaquePalette);
        child.setAutoFillBackground(true);
        QApplication::processEvents();

        w.reset();
        child.reset();

        w.update();
        QApplication::processEvents();
        QApplication::processEvents();

        QCOMPARE(w.numPaintEvents, 1);
        QRegion expectedVisible = QRegion(w.rect())
                                  - child.visibleRegion().translated(childOffset);
        QCOMPARE(w.visibleRegion(), expectedVisible);
        QCOMPARE(w.paintedRegion, expectedVisible);
        QCOMPARE(child.numPaintEvents, 0);

        w.reset();
        child.reset();

        child.update();
        QApplication::processEvents();
        QApplication::processEvents();

        QCOMPARE(w.numPaintEvents, 0);
        QCOMPARE(child.numPaintEvents, 1);
        QCOMPARE(child.paintedRegion, child.visibleRegion());

        w.reset();
        child.reset();
    }

    // overlapping sibling
    UpdateWidget sibling(&w);
    sibling.setPalette(simplePalette());
    child.setGeometry(10, 10, 20, 20);
    sibling.setGeometry(15, 15, 20, 20);
    sibling.show();

    QApplication::processEvents();
    w.reset();
    child.reset();
    sibling.reset();

    const QPoint siblingOffset = sibling.mapToParent(QPoint());

    sibling.update();
    QApplication::processEvents();
    QApplication::processEvents();

    // child is opaque, sibling transparent
    {
        QCOMPARE(sibling.numPaintEvents, 1);
        QCOMPARE(sibling.paintedRegion, sibling.visibleRegion());

        QCOMPARE(child.numPaintEvents, 1);
        QCOMPARE(child.paintedRegion.translated(childOffset),
                 child.visibleRegion().translated(childOffset)
                 & sibling.visibleRegion().translated(siblingOffset));

        QCOMPARE(w.numPaintEvents, 1);
        QCOMPARE(w.paintedRegion,
                 w.visibleRegion() & sibling.visibleRegion().translated(siblingOffset));
        QCOMPARE(w.paintedRegion,
                 (w.visibleRegion() - child.visibleRegion().translated(childOffset))
                 & sibling.visibleRegion().translated(siblingOffset));

    }
    w.reset();
    child.reset();
    sibling.reset();

    sibling.setPalette(opaquePalette);
    sibling.setAutoFillBackground(true);

    sibling.update();
    QApplication::processEvents();
    QApplication::processEvents();

    // child opaque, sibling opaque
    {
        QCOMPARE(sibling.numPaintEvents, 1);
        QCOMPARE(sibling.paintedRegion, sibling.visibleRegion());

#ifdef Q_OS_MACOS
        if (child.internalWinId()) // child is native
            QEXPECT_FAIL(0, "Cocoa compositor paints child and sibling", Continue);
#endif
        QCOMPARE(child.numPaintEvents, 0);
        QCOMPARE(child.visibleRegion(),
                 QRegion(child.rect())
                 - sibling.visibleRegion().translated(siblingOffset - childOffset));

        QCOMPARE(w.numPaintEvents, 0);
        QCOMPARE(w.visibleRegion(),
                 QRegion(w.rect())
                 - child.visibleRegion().translated(childOffset)
                 - sibling.visibleRegion().translated(siblingOffset));
    }
}

#ifndef Q_OS_MACOS
static inline bool isOpaque(QWidget *widget)
{
    if (!widget)
        return false;
    return qt_widget_private(widget)->isOpaque;
}
#endif

void tst_QWidget::isOpaque()
{
#ifndef Q_OS_MACOS
    QWidget w;
    w.setPalette(simplePalette());
    QVERIFY(::isOpaque(&w));

    QWidget child(&w);
    child.setPalette(simplePalette());
    QVERIFY(!::isOpaque(&child));

    child.setAutoFillBackground(true);
    QVERIFY(::isOpaque(&child));

    QPalette palette;

    // background color

    palette = child.palette();
    palette.setColor(child.backgroundRole(), QColor(255, 0, 0, 127));
    child.setPalette(palette);
    QVERIFY(!::isOpaque(&child));

    palette.setColor(child.backgroundRole(), QColor(255, 0, 0, 255));
    child.setPalette(palette);
    QVERIFY(::isOpaque(&child));

    palette.setColor(QPalette::Window, QColor(0, 0, 255, 127));
    w.setPalette(palette);

    QVERIFY(!::isOpaque(&w));

    child.setAutoFillBackground(false);
    QVERIFY(!::isOpaque(&child));

    // Qt::WA_OpaquePaintEvent

    child.setAttribute(Qt::WA_OpaquePaintEvent);
    QVERIFY(::isOpaque(&child));

    child.setAttribute(Qt::WA_OpaquePaintEvent, false);
    QVERIFY(!::isOpaque(&child));

    // Qt::WA_NoSystemBackground

    child.setAttribute(Qt::WA_NoSystemBackground);
    QVERIFY(!::isOpaque(&child));

    child.setAttribute(Qt::WA_NoSystemBackground, false);
    QVERIFY(!::isOpaque(&child));

    palette.setColor(QPalette::Window, QColor(0, 0, 255, 255));
    w.setPalette(palette);
    QVERIFY(::isOpaque(&w));

    w.setAttribute(Qt::WA_NoSystemBackground);
    QVERIFY(!::isOpaque(&w));

    w.setAttribute(Qt::WA_NoSystemBackground, false);
    QVERIFY(::isOpaque(&w));

    {
        QPalette palette = QApplication::palette();
        QPalette old = palette;
        palette.setColor(QPalette::Window, Qt::transparent);
        QApplication::setPalette(palette);

        QWidget widget;
        QVERIFY(!::isOpaque(&widget));

        QApplication::setPalette(old);
        QApplication::sendPostedEvents(&widget, QEvent::ApplicationPaletteChange);
        QCOMPARE(::isOpaque(&widget), old.color(QPalette::Window).alpha() == 255);
    }
#endif
}

#ifndef Q_OS_MACOS
/*
    Test that scrolling of a widget invalidates the correct regions
*/
void tst_QWidget::scroll()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    QScreen *screen = QGuiApplication::primaryScreen();
    const int w = qMin(500, screen->availableGeometry().width() / 2);
    const int h = qMin(500, screen->availableGeometry().height() / 2);

    UpdateWidget updateWidget;
    updateWidget.setPalette(simplePalette());
    updateWidget.resize(w, h);
    updateWidget.reset();
    updateWidget.move(m_availableTopLeft);
    updateWidget.showNormal();
    QApplicationPrivate::setActiveWindow(&updateWidget);
    QVERIFY(QTest::qWaitForWindowActive(&updateWidget));
    QVERIFY(updateWidget.numPaintEvents > 0);

    {
        updateWidget.reset();
        updateWidget.scroll(10, 10);
        QCoreApplication::processEvents();
        QRegion dirty(QRect(0, 0, w, 10));
        dirty += QRegion(QRect(0, 10, 10, h - 10));
        QTRY_COMPARE(updateWidget.paintedRegion, dirty);
    }

    {
        updateWidget.reset();
        updateWidget.update(0, 0, 10, 10);
        updateWidget.scroll(0, 10);
        QCoreApplication::processEvents();
        QRegion dirty(QRect(0, 0, w, 10));
        dirty += QRegion(QRect(0, 10, 10, 10));
        QTRY_COMPARE(updateWidget.paintedRegion, dirty);
    }

    if (updateWidget.width() < 200 || updateWidget.height() < 200)
         QSKIP("Skip this test due to too small screen geometry.");

    {
        updateWidget.reset();
        updateWidget.update(0, 0, 100, 100);
        updateWidget.scroll(10, 10, QRect(50, 50, 100, 100));
        QCoreApplication::processEvents();
        QRegion dirty(QRect(0, 0, 100, 50));
        dirty += QRegion(QRect(0, 50, 150, 10));
        dirty += QRegion(QRect(0, 60, 110, 40));
        dirty += QRegion(QRect(50, 100, 60, 10));
        dirty += QRegion(QRect(50, 110, 10, 40));
        QTRY_COMPARE(updateWidget.paintedRegion, dirty);
    }

    {
        updateWidget.reset();
        updateWidget.update(0, 0, 100, 100);
        updateWidget.scroll(10, 10, QRect(100, 100, 100, 100));
        QCoreApplication::processEvents();
        QRegion dirty(QRect(0, 0, 100, 100));
        dirty += QRegion(QRect(100, 100, 100, 10));
        dirty += QRegion(QRect(100, 110, 10, 90));
        QTRY_COMPARE(updateWidget.paintedRegion, dirty);
    }
}

// QTBUG-38999, scrolling a widget with native child widgets should move the children.
void tst_QWidget::scrollNativeChildren()
{
    QWidget parent;
    parent.setWindowTitle(QLatin1String(__FUNCTION__));
    parent.resize(400, 400);
    centerOnScreen(&parent);
    QLabel *nativeLabel = new QLabel(QStringLiteral("nativeLabel"), &parent);
    const QPoint oldLabelPos(100, 100);
    nativeLabel->move(oldLabelPos);
    QVERIFY(nativeLabel->winId());
    parent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));
    const QPoint delta(50, 50);
    parent.scroll(delta.x(), delta.y());
    const QPoint newLabelPos = oldLabelPos + delta;
    QWindow *labelWindow = nativeLabel->windowHandle();
    QVERIFY(labelWindow);
    QTRY_COMPARE(labelWindow->geometry().topLeft(), newLabelPos);
    QTRY_COMPARE(nativeLabel->geometry().topLeft(), newLabelPos);
}

#endif // Mac OS

/*
    This class is used as a slot object to test two different steps of
    QWidget destruction.

    The first step is connecting the destroyed() signal to an object of
    this class (through its operator()). In widgets, destroyed() is
    emitted by ~QWidget, and not by ~QObject. This means that in our
    operator() we expect the sender of the signal to still be a
    QWidget.

    The connection realized at the first step means that now there's
    an instance of this class owned by the sender object. That instance
    is destroyed when the signal/slot connections are destroyed.
    That happens in ~QObject, not in ~QWidget. Therefore, in the
    destructor of this class, check that indeed the target is no longer
    a QWidget but just a QObject.
*/
class QObjectCastChecker
{
public:
    explicit QObjectCastChecker(QWidget *target)
        : m_target(target)
    {
    }

    ~QObjectCastChecker()
    {
        if (!m_target)
            return;

        // When ~QObject is reached, check that indeed the object is no
        // longer a QWidget. This relies on slots being disconnected in
        // ~QObject (and this "slot object" being destroyed there).
        QVERIFY(!qobject_cast<QWidget *>(m_target));
        QVERIFY(!dynamic_cast<QWidget *>(m_target));
        QVERIFY(!m_target->isWidgetType());
    }

    QObjectCastChecker(QObjectCastChecker &&other) noexcept
        : m_target(std::exchange(other.m_target, nullptr))
    {}

    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QObjectCastChecker)

    void swap(QObjectCastChecker &other) noexcept
    {
        qSwap(m_target, other.m_target);
    }

    void operator()(QObject *object) const
    {
        // Test that in a slot connected to destroyed() the emitter is
        // still a QWidget. This is because ~QWidget() itself emits the
        // signal.
        QVERIFY(qobject_cast<QWidget *>(object));
        QVERIFY(dynamic_cast<QWidget *>(object));
        QVERIFY(object->isWidgetType());
    }

private:
    Q_DISABLE_COPY(QObjectCastChecker)
    QObject *m_target;
};

void tst_QWidget::qobject_castOnDestruction()
{
    QWidget widget;
    QObject::connect(&widget, &QObject::destroyed, QObjectCastChecker(&widget));
}

// Since X11 WindowManager operations are all async, and we have no way to know if the window
// manager has finished playing with the window geometry, this test can't be reliable on X11.

using Rects = QList<QRect>;

void tst_QWidget::setWindowGeometry_data()
{
    QTest::addColumn<Rects>("rects");
    QTest::addColumn<int>("windowFlags");

    QList<Rects> rects;
    const int width = m_testWidgetSize.width();
    const int height = m_testWidgetSize.height();
    const QRect availableAdjusted = QGuiApplication::primaryScreen()->availableGeometry().adjusted(100, 100, -100, -100);
    rects << Rects{QRect(m_availableTopLeft + QPoint(100, 100), m_testWidgetSize),
                   availableAdjusted,
                   QRect(m_availableTopLeft + QPoint(130, 100), QSize(0, height)),
                   QRect(m_availableTopLeft + QPoint(100, 50), QSize(width, 0)),
                   QRect(m_availableTopLeft + QPoint(130, 50), QSize(0, 0))}
          << Rects{availableAdjusted,
                   QRect(m_availableTopLeft + QPoint(130, 100), QSize(0, height)),
                   QRect(m_availableTopLeft + QPoint(100, 50), QSize(width, 0)),
                   QRect(m_availableTopLeft + QPoint(130, 50), QSize(0, 0)),
                   QRect(m_availableTopLeft + QPoint(100, 100), QSize(width, height))}
          << Rects{QRect(m_availableTopLeft + QPoint(130, 100), QSize(0, height)),
                   QRect(m_availableTopLeft + QPoint(100, 50), QSize(width, 0)),
                   QRect(m_availableTopLeft + QPoint(130, 50), QSize(0, 0)),
                   QRect(m_availableTopLeft + QPoint(100, 100), QSize(width, height)),
                   availableAdjusted}
          << Rects{QRect(m_availableTopLeft + QPoint(100, 50), QSize(width, 0)),
                   QRect(m_availableTopLeft + QPoint(130, 50), QSize(0, 0)),
                   QRect(m_availableTopLeft + QPoint(100, 100), QSize(width, height)),
                   availableAdjusted,
                   QRect(m_availableTopLeft + QPoint(130, 100), QSize(0, height))}
          << Rects{QRect(m_availableTopLeft + QPoint(130, 50), QSize(0, 0)),
                   QRect(m_availableTopLeft + QPoint(100, 100), QSize(width, height)),
                   availableAdjusted,
                   QRect(m_availableTopLeft + QPoint(130, 100), QSize(0, height)),
                   QRect(m_availableTopLeft + QPoint(100, 50), QSize(width, 0))};

    const Qt::WindowFlags windowFlags[] = {Qt::WindowFlags(), Qt::FramelessWindowHint};

    const bool skipEmptyRects = (m_platform == QStringLiteral("windows"));
    for (Rects l : std::as_const(rects)) {
        if (skipEmptyRects)
            l.removeIf([] (const QRect &r) { return r.isEmpty(); });
        const QRect &rect = l.constFirst();
        for (int windowFlag : windowFlags) {
            QTest::newRow(QString("%1,%2 %3x%4, flags %5")
                          .arg(rect.x())
                          .arg(rect.y())
                          .arg(rect.width())
                          .arg(rect.height())
                          .arg(windowFlag, 0, 16).toLatin1())
                << l
                << windowFlag;
        }
    }
}

void tst_QWidget::setWindowGeometry()
{
    if (m_platform == QStringLiteral("xcb") || m_platform.startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
         QSKIP("X11/Wayland: Skip this test due to Window manager positioning issues.");

    QFETCH(Rects, rects);
    QFETCH(int, windowFlags);
    QRect rect = rects.takeFirst();

    {
        // test setGeometry() without actually showing the window
        QWidget widget;
        if (windowFlags != 0)
            widget.setWindowFlags(Qt::WindowFlags(windowFlags));

        widget.setGeometry(rect);
        QTest::qWait(100);
        QCOMPARE(widget.geometry(), rect);

        // setGeometry() without showing
        for (const QRect &r : std::as_const(rects)) {
            widget.setGeometry(r);
            QTest::qWait(100);
            QCOMPARE(widget.geometry(), r);
        }
    }

    {
        // setGeometry() first, then show()
        QWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        if (windowFlags != 0)
            widget.setWindowFlags(Qt::WindowFlags(windowFlags));

        widget.setGeometry(rect);
        widget.showNormal();
        if (rect.isValid()) {
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        } else {
            // in case of an invalid rect, wait for the geometry to become
            // adjusted to the actual (valid) value.
            QApplication::processEvents();
        }
        QTRY_COMPARE(widget.geometry(), rect);

        // setGeometry() while shown
        for (const QRect &r : std::as_const(rects)) {
            widget.setGeometry(r);
            QTest::qWait(10);
            QTRY_COMPARE(widget.geometry(), r);
        }
        widget.setGeometry(rect);
        QTest::qWait(20);
        QTRY_COMPARE(widget.geometry(), rect);

        // now hide
        widget.hide();
        QTest::qWait(20);
        QTRY_COMPARE(widget.geometry(), rect);

        // setGeometry() after hide()
        for (const QRect &r : std::as_const(rects)) {
            widget.setGeometry(r);
            QTest::qWait(10);
            QTRY_COMPARE(widget.geometry(), r);
        }
        widget.setGeometry(rect);
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);

        // show() again, geometry() should still be the same
        QTestPrivate::androidCompatibleShow(&widget);
        if (rect.isValid())
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QTRY_COMPARE(widget.geometry(), rect);

        // final hide(), again geometry() should be unchanged
        widget.hide();
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);
    }

    {
        // show() first, then setGeometry()
        QWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        if (windowFlags != 0)
            widget.setWindowFlags(Qt::WindowFlags(windowFlags));

        widget.showNormal();
        if (rect.isValid())
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        widget.setGeometry(rect);
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);

        // setGeometry() while shown
        for (const QRect &r : std::as_const(rects)) {
            widget.setGeometry(r);
            QTest::qWait(10);
            QTRY_COMPARE(widget.geometry(), r);
        }
        widget.setGeometry(rect);
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);

        // now hide
        widget.hide();
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);

        // setGeometry() after hide()
        for (const QRect &r : std::as_const(rects)) {
            widget.setGeometry(r);
            QTest::qWait(10);
            QTRY_COMPARE(widget.geometry(), r);
        }
        widget.setGeometry(rect);
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);

        // show() again, geometry() should still be the same
        QTestPrivate::androidCompatibleShow(&widget);
        if (rect.isValid())
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);

        // final hide(), again geometry() should be unchanged
        widget.hide();
        QTest::qWait(10);
        QTRY_COMPARE(widget.geometry(), rect);
    }
}

#if defined (Q_OS_WIN)
void tst_QWidget::setGeometry_win()
{
    QWidget widget;

    setFrameless(&widget);
    widget.setGeometry(QRect(m_availableTopLeft + QPoint(0, 600), QSize(100, 100)));
    widget.show();
    widget.setWindowState(widget.windowState() | Qt::WindowMaximized);
    QRect geom = widget.normalGeometry();
    widget.close();
    widget.setGeometry(geom);
    widget.setWindowState(widget.windowState() | Qt::WindowMaximized);
    widget.show();
    RECT rt;
    ::GetWindowRect(winHandleOf(&widget), &rt);
    QVERIFY2(rt.left <= m_availableTopLeft.x(),
             msgComparisonFailed(int(rt.left), "<=", m_availableTopLeft.x()));
    QVERIFY2(rt.top <= m_availableTopLeft.y(),
             msgComparisonFailed(int(rt.top), "<=", m_availableTopLeft.y()));
}
#endif // defined (Q_OS_WIN)

// Since X11 WindowManager operation are all async, and we have no way to know if the window
// manager has finished playing with the window geometry, this test can't be reliable on X11.

void tst_QWidget::windowMoveResize_data()
{
    setWindowGeometry_data();
}

void tst_QWidget::windowMoveResize()
{
    if (m_platform == QStringLiteral("xcb"))
         QSKIP("X11: Skip this test due to Window manager positioning issues.");
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");

    QFETCH(Rects, rects);
    QFETCH(int, windowFlags);

    QRect rect = rects.takeFirst();

    {
        // test setGeometry() without actually showing the window
        QWidget widget;
        if (windowFlags != 0)
            widget.setWindowFlags(Qt::WindowFlags(windowFlags));

        widget.move(rect.topLeft());
        widget.resize(rect.size());
        QTest::qWait(10);
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // move() without showing
        for (const QRect &r : std::as_const(rects)) {
            widget.move(r.topLeft());
            widget.resize(r.size());
            QApplication::processEvents();
            QTRY_COMPARE(widget.pos(), r.topLeft());
            QTRY_COMPARE(widget.size(), r.size());
        }
    }

    {
        // move() first, then show()
        QWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        if (windowFlags != 0)
            widget.setWindowFlags(Qt::WindowFlags(windowFlags));

        widget.move(rect.topLeft());
        widget.resize(rect.size());
        widget.showNormal();

        QTest::qWait(10);
        QTRY_VERIFY2(HighDpi::fuzzyCompare(widget.pos(), rect.topLeft(), m_fuzz),
                     qPrintable(HighDpi::msgPointMismatch(widget.pos(), rect.topLeft())));
        // Windows: Minimum size of decorated windows.
        const bool expectResizeFail = (!windowFlags && (rect.width() < 160 || rect.height() < 40))
            && m_platform == QStringLiteral("windows");
        if (!expectResizeFail)
            QTRY_COMPARE(widget.size(), rect.size());

        // move() while shown
        for (const QRect &r : std::as_const(rects)) {
            // XCB: First resize after show of zero-sized gets wrong win_gravity.
            const bool expectMoveFail = !windowFlags
                && ((widget.width() == 0 || widget.height() == 0) && r.width() != 0 && r.height() != 0)
                && m_platform == QStringLiteral("xcb")
                && (rect == QRect(QPoint(130, 100), QSize(0, 200))
                    || rect == QRect(QPoint(100, 50), QSize(200, 0))
                    || rect == QRect(QPoint(130, 50), QSize(0, 0)));
            widget.move(r.topLeft());
            widget.resize(r.size());
            QApplication::processEvents();
            if (!expectMoveFail) {
                QTRY_COMPARE(widget.pos(), r.topLeft());
                QTRY_COMPARE(widget.size(), r.size());
            }
        }
        widget.move(rect.topLeft());
        widget.resize(rect.size());
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // now hide
        widget.hide();
        QTest::qWait(10);
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // move() after hide()
        for (const QRect &r : std::as_const(rects)) {
            widget.move(r.topLeft());
            widget.resize(r.size());
            QApplication::processEvents();
#if defined(Q_OS_MACOS)
            if (r.width() == 0 && r.height() > 0) {
                widget.move(r.topLeft());
                widget.resize(r.size());
             }
#endif
            QTRY_COMPARE(widget.pos(), r.topLeft());
            QTRY_COMPARE(widget.size(), r.size());
        }
        widget.move(rect.topLeft());
        widget.resize(rect.size());
        QTest::qWait(10);
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // show() again, pos() should be the same
        QTestPrivate::androidCompatibleShow(&widget);
        if (rect.isValid())
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // final hide(), again pos() should be unchanged
        widget.hide();
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());
    }

    {
        // show() first, then move()
        QWidget widget;
        if (windowFlags != 0)
            widget.setWindowFlags(Qt::WindowFlags(windowFlags));

        widget.showNormal();
        if (rect.isValid())
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QApplication::processEvents();
        widget.move(rect.topLeft());
        widget.resize(rect.size());
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // move() while shown
        for (const QRect &r : std::as_const(rects)) {
            widget.move(r.topLeft());
            widget.resize(r.size());
            QApplication::processEvents();
            QTRY_COMPARE(widget.pos(), r.topLeft());
            QTRY_COMPARE(widget.size(), r.size());
        }
        widget.move(rect.topLeft());
        widget.resize(rect.size());
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // now hide
        widget.hide();
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // move() after hide()
        for (const QRect &r : std::as_const(rects)) {
            widget.move(r.topLeft());
            widget.resize(r.size());
            QApplication::processEvents();
#if defined(Q_OS_MACOS)
            if (r.width() == 0 && r.height() > 0) {
                widget.move(r.topLeft());
                widget.resize(r.size());
             }
#endif
            QTRY_COMPARE(widget.pos(), r.topLeft());
            QTRY_COMPARE(widget.size(), r.size());
        }
        widget.move(rect.topLeft());
        widget.resize(rect.size());
        QApplication::processEvents();
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // show() again, pos() should be the same
        QTestPrivate::androidCompatibleShow(&widget);
        if (rect.isValid())
            QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QTest::qWait(10);
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());

        // final hide(), again pos() should be unchanged
        widget.hide();
        QTest::qWait(10);
        QTRY_COMPARE(widget.pos(), rect.topLeft());
        QTRY_COMPARE(widget.size(), rect.size());
    }
}

class ColorWidget : public QWidget
{
public:
    explicit ColorWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags(),
                         const QColor &c = QColor(Qt::red))
        : QWidget(parent, f), color(c)
    {
        QPalette opaquePalette = palette();
        opaquePalette.setColor(backgroundRole(), color);
        setPalette(opaquePalette);
        setAutoFillBackground(true);
    }

    void paintEvent(QPaintEvent *e) override
    {
        r += e->region();
    }

    void reset()
    {
        r = QRegion();
    }

    void enterEvent(QEnterEvent *) override { ++enters; }
    void leaveEvent(QEvent *) override { ++leaves; }

    void resetCounts()
    {
        enters = 0;
        leaves = 0;
    }

    QColor color;
    QRegion r;
    int enters = 0;
    int leaves = 0;
};

static inline QByteArray msgRgbMismatch(unsigned actual, unsigned expected)
{
    return QByteArrayLiteral("Color mismatch, 0x") + QByteArray::number(actual, 16) +
           QByteArrayLiteral(" != 0x") + QByteArray::number(expected, 16);
}

static QPixmap grabWindow(QWindow *window, int x, int y, int width, int height)
{
    QScreen *screen = window->screen();
    Q_ASSERT(screen);
    return screen->grabWindow(window->winId(), x, y, width, height);
}

#define VERIFY_COLOR(child, region, color) verifyColor(child, region, color, __LINE__)

bool verifyColor(QWidget &child, const QRegion &region, const QColor &color, int callerLine)
{
    QWindow *window = child.window()->windowHandle();
    Q_ASSERT(window);
    const QPoint offset = child.mapTo(child.window(), QPoint(0,0));
    bool grabBackingStore = false;
    for (QRect r : region) {
        QRect rect = r.translated(offset);
        for (int t = 0; t < 6; t++) {
            const QPixmap pixmap = grabBackingStore
                ? child.grab(rect)
                : grabWindow(window, rect.left(), rect.top(), rect.width(), rect.height());
            const QSize actualSize = pixmap.size() / pixmap.devicePixelRatio();
            if (!QTest::qCompare(actualSize, rect.size(), "pixmap.size()", "rect.size()", __FILE__, callerLine))
                return false;
            QPixmap expectedPixmap(pixmap); /* ensure equal formats */
            expectedPixmap.detach();
            expectedPixmap.fill(color);
            QImage image = pixmap.toImage();
            uint alphaCorrection = image.format() == QImage::Format_RGB32 ? 0xff000000 : 0;
            uint firstPixel = image.pixel(0,0) | alphaCorrection;
            if (t < 5) {
                /* Normal run.
                   If it succeeds: return success
                   If it fails:    do not return, but wait a bit and reiterate (retry)
                */
                if (firstPixel == QColor(color).rgb() && image == expectedPixmap.toImage())
                    return true;
                if (t == 4) {
                    grabBackingStore = true;
                    rect = r;
                } else {
                    QTest::qWait(200);
                }
            } else {
                // Last run, report failure if it still fails
                if (!QTest::qVerify(firstPixel == QColor(color).rgb(),
                                   "firstPixel == QColor(color).rgb()",
                                    qPrintable(msgRgbMismatch(firstPixel, QColor(color).rgb())),
                                    __FILE__, callerLine))
                    return false;
                if (!QTest::qVerify(image == expectedPixmap.toImage(),
                                    "image == expectedPixmap.toImage()",
                                    "grabbed pixmap differs from expected pixmap",
                                    __FILE__, callerLine))
                    return false;
            }
        }
    }
    return true;
}

void tst_QWidget::moveChild_data()
{
    QTest::addColumn<QPoint>("offset");

    QTest::newRow("right") << QPoint(20, 0);
    QTest::newRow("down") << QPoint(0, 20);
    QTest::newRow("left") << QPoint(-20, 0);
    QTest::newRow("up") << QPoint(0, -20);
}

void tst_QWidget::moveChild()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    QFETCH(QPoint, offset);

    ColorWidget parent(nullptr, Qt::Window | Qt::WindowStaysOnTopHint);
    // prevent custom styles
    const QScopedPointer<QStyle> style(QStyleFactory::create(QLatin1String("Windows")));
    parent.setStyle(style.data());
    ColorWidget child(&parent, Qt::Widget, Qt::blue);

    parent.setGeometry(QRect(m_availableTopLeft + QPoint(50, 50), QSize(200, 200)));
    child.setGeometry(25, 25, 50, 50);
#ifndef QT_NO_CURSOR // Try to make sure the cursor is not in a taskbar area to prevent tooltips or window highlighting
    QCursor::setPos(parent.geometry().topRight() + QPoint(50 , 50));
#endif
    parent.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));

    if (QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation)) {
        // On some platforms (macOS), the palette will be different depending on if a
        // window is active or not. And because of that, the whole window will be
        // repainted when going from Inactive to Active. So wait for the window to be
        // active before we continue, so the activation doesn't happen at a random
        // time below. And call processEvents to have the paint events delivered right away.
        QVERIFY(QTest::qWaitForWindowActive(&parent));
        qApp->processEvents();
    }

    QTRY_COMPARE(parent.r, QRegion(parent.rect()) - child.geometry());
    QTRY_COMPARE(child.r, QRegion(child.rect()));

    VERIFY_COLOR(child, child.rect(),
                 child.color);
    VERIFY_COLOR(parent, QRegion(parent.rect()) - child.geometry(), parent.color);
    parent.reset();
    child.reset();

    // move

    const QRect oldGeometry = child.geometry();

    QPoint pos = child.pos() + offset;
    child.move(pos);
    QTRY_COMPARE(pos, child.pos());

    QTRY_COMPARE(parent.r, QRegion(oldGeometry) - child.geometry());

    // should be scrolled in backingstore
    QCOMPARE(child.r, QRegion());
    VERIFY_COLOR(child, child.rect(), child.color);
    VERIFY_COLOR(parent, QRegion(parent.rect()) - child.geometry(), parent.color);
}

void tst_QWidget::showAndMoveChild()
{
#ifdef ANDROID
    QSKIP("Fails on Android due to removed grabWindow(): QTBUG-118849");
#endif
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    QWidget parent(nullptr, Qt::Window | Qt::WindowStaysOnTopHint);
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    // prevent custom styles
    const QScopedPointer<QStyle> style(QStyleFactory::create(QLatin1String("Windows")));
    parent.setStyle(style.data());

    QRect desktopDimensions = parent.screen()->availableGeometry();
    desktopDimensions = desktopDimensions.adjusted(64, 64, -64, -64);

#ifndef QT_NO_CURSOR // Try to make sure the cursor is not in a taskbar area to prevent tooltips or window highlighting
    QCursor::setPos(desktopDimensions.topRight() + QPoint(40, 40));
#endif
    parent.setGeometry(desktopDimensions);
    parent.setPalette(Qt::red);
    parent.show();
    QApplicationPrivate::setActiveWindow(&parent);
    QVERIFY(QTest::qWaitForWindowActive(&parent));

    QWidget child(&parent);
    child.resize(desktopDimensions.width()/2, desktopDimensions.height()/2);
    child.setPalette(Qt::blue);
    child.setAutoFillBackground(true);

    // Ensure that the child is repainted correctly when moved right after show.
    // NB! Do NOT processEvents() (or qWait()) in between show() and move().
    child.show();
    child.move(desktopDimensions.width()/2, desktopDimensions.height()/2);
    QCoreApplication::processEvents();

    VERIFY_COLOR(child, child.rect(), Qt::blue);
    VERIFY_COLOR(parent, QRegion(parent.rect()) - child.geometry(), Qt::red);
}


void tst_QWidget::subtractOpaqueSiblings()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974: Cocoa only has rect granularity.");
#endif

    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.setGeometry(50, 50, 300, 300);

    ColorWidget *large = new ColorWidget(&w, Qt::Widget, Qt::red);
    large->setGeometry(50, 50, 200, 200);

    ColorWidget *medium = new ColorWidget(large, Qt::Widget, Qt::gray);
    medium->setGeometry(50, 50, 100, 100);

    ColorWidget *tall = new ColorWidget(&w, Qt::Widget, Qt::blue);
    tall->setGeometry(100, 30, 50, 100);

    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));

    large->reset();
    medium->reset();
    tall->reset();

    medium->update();

    // QWidgetPrivate::subtractOpaqueSiblings() should prevent parts of medium
    // to be repainted and tall from be repainted at all.

    QTRY_COMPARE(large->r, QRegion());
    QTRY_COMPARE(tall->r, QRegion());
    QTRY_COMPARE(medium->r.translated(medium->mapTo(&w, QPoint())),
             QRegion(medium->geometry().translated(large->pos()))
             - tall->geometry());
}

void tst_QWidget::deleteStyle()
{
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.setStyle(QStyleFactory::create(QLatin1String("Windows")));
    widget.show();
    delete widget.style();
    QCoreApplication::processEvents();
}

class TopLevelFocusCheck: public QWidget
{
    Q_OBJECT
public:
    QLineEdit* edit;
    explicit TopLevelFocusCheck(QWidget *parent = nullptr)
        : QWidget(parent), edit(new QLineEdit(this))
    {
        edit->hide();
        edit->installEventFilter(this);
    }

public slots:
    void mouseDoubleClickEvent ( QMouseEvent * /*event*/ ) override
    {
        edit->show();
        edit->setFocus(Qt::OtherFocusReason);
        QCoreApplication::processEvents();
    }
    bool eventFilter(QObject *obj, QEvent *event) override
    {
        if (obj == edit && event->type()== QEvent::FocusOut) {
            edit->hide();
            return true;
        }
        return false;
    }
};

void tst_QWidget::multipleToplevelFocusCheck()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("Window activation is not supported");
    TopLevelFocusCheck w1;
    TopLevelFocusCheck w2;

    const QString title = QLatin1String(QTest::currentTestFunction());
    w1.setWindowTitle(title + QLatin1String("_W1"));
    w1.move(m_availableTopLeft + QPoint(20, 20));
    w1.resize(200, 200);
    w1.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w1));
    w2.setWindowTitle(title + QLatin1String("_W2"));
    w2.move(w1.frameGeometry().topRight() + QPoint(20, 0));
    w2.resize(200,200);
    w2.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w2));

    w1.activateWindow();
    QApplicationPrivate::setActiveWindow(&w1);
    QVERIFY(QTest::qWaitForWindowActive(&w1));
    QTRY_COMPARE(QApplication::activeWindow(), static_cast<QWidget *>(&w1));
    QTest::mouseDClick(&w1, Qt::LeftButton);
    QTRY_COMPARE(QApplication::focusWidget(), static_cast<QWidget *>(w1.edit));

    w2.activateWindow();
    QApplicationPrivate::setActiveWindow(&w2);
    QVERIFY(QTest::qWaitForWindowActive(&w2));
    QTRY_COMPARE(QApplication::activeWindow(), static_cast<QWidget *>(&w2));
    QTest::mouseClick(&w2, Qt::LeftButton);
    QTRY_COMPARE(QApplication::focusWidget(), nullptr);

    QTest::mouseDClick(&w2, Qt::LeftButton);
    QTRY_COMPARE(QApplication::focusWidget(), static_cast<QWidget *>(w2.edit));

    w1.activateWindow();
    QApplicationPrivate::setActiveWindow(&w1);
    QVERIFY(QTest::qWaitForWindowActive(&w1));
    QTRY_COMPARE(QApplication::activeWindow(), static_cast<QWidget *>(&w1));
    QTest::mouseDClick(&w1, Qt::LeftButton);
    QTRY_COMPARE(QApplication::focusWidget(), static_cast<QWidget *>(w1.edit));

    w2.activateWindow();
    QApplicationPrivate::setActiveWindow(&w2);
    QVERIFY(QTest::qWaitForWindowActive(&w2));
    QTRY_COMPARE(QApplication::activeWindow(), static_cast<QWidget *>(&w2));
    QTest::mouseClick(&w2, Qt::LeftButton);
    QTRY_COMPARE(QApplication::focusWidget(), nullptr);
}

class FocusWidget: public QWidget
{
protected:
    bool event(QEvent *ev) override
    {
        if (ev->type() == QEvent::FocusAboutToChange)
            widgetDuringFocusAboutToChange = QApplication::focusWidget();
        return QWidget::event(ev);
    }
    void focusInEvent(QFocusEvent *) override
    {
        focusObjectDuringFocusIn = QGuiApplication::focusObject();
        detectedBadEventOrdering = focusObjectDuringFocusIn != mostRecentFocusObjectChange;
    }
    void focusOutEvent(QFocusEvent *) override
    {
        focusObjectDuringFocusOut = QGuiApplication::focusObject();
        widgetDuringFocusOut = QApplication::focusWidget();
        detectedBadEventOrdering = focusObjectDuringFocusOut != mostRecentFocusObjectChange;
    }

    void focusObjectChanged(QObject *focusObject)
    {
        mostRecentFocusObjectChange = focusObject;
    }

public:
    explicit FocusWidget(QWidget *parent) : QWidget(parent)
    {
        connect(qGuiApp, &QGuiApplication::focusObjectChanged, this, &FocusWidget::focusObjectChanged);
    }

    QWidget *widgetDuringFocusAboutToChange = nullptr;
    QWidget *widgetDuringFocusOut = nullptr;

    QObject *focusObjectDuringFocusIn = nullptr;
    QObject *focusObjectDuringFocusOut = nullptr;

    QObject *mostRecentFocusObjectChange = nullptr;
    bool detectedBadEventOrdering = false;
};

void tst_QWidget::setFocus()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("Window activation is not supported");

    QScopedPointer<QWidget> testWidget(new QWidget);
    testWidget->resize(m_testWidgetSize);
    testWidget->setWindowTitle(__FUNCTION__);
    centerOnScreen(testWidget.data());
    testWidget->show();
    QVERIFY(QTest::qWaitForWindowExposed(testWidget.data()));

    const QPoint windowPos = testWidget->geometry().topRight() + QPoint(50, 0);
    {
        // move focus to another window
        testWidget->activateWindow();
        QApplicationPrivate::setActiveWindow(testWidget.data());
        if (testWidget->focusWidget())
            testWidget->focusWidget()->clearFocus();
        else
            testWidget->clearFocus();

        // window and children never shown, nobody gets focus
        QWidget window;
        window.setWindowTitle(QStringLiteral("#1 ") + __FUNCTION__);
        window.resize(m_testWidgetSize);
        window.move(windowPos);

        QWidget child1(&window);
        child1.setFocusPolicy(Qt::StrongFocus);

        QWidget child2(&window);
        child2.setFocusPolicy(Qt::StrongFocus);

        child1.setFocus();
        QVERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), &child1);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child2.setFocus();
        QVERIFY(!child2.hasFocus());
        QCOMPARE(window.focusWidget(), &child2);
        QCOMPARE(QApplication::focusWidget(), nullptr);
    }

    {
        // window and children show, but window not active, nobody gets focus
        QWidget window;
        window.setWindowTitle(QStringLiteral("#2 ") + __FUNCTION__);
        window.resize(m_testWidgetSize);
        window.move(windowPos);

        QWidget child1(&window);
        child1.setFocusPolicy(Qt::StrongFocus);

        QWidget child2(&window);
        child2.setFocusPolicy(Qt::StrongFocus);

        window.show();

        // note: window may be active, but we don't want it to be
        testWidget->activateWindow();
        QApplicationPrivate::setActiveWindow(testWidget.data());
        if (testWidget->focusWidget())
            testWidget->focusWidget()->clearFocus();
        else
            testWidget->clearFocus();

        child1.setFocus();
        QVERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), &child1);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child2.setFocus();
        QVERIFY(!child2.hasFocus());
        QCOMPARE(window.focusWidget(), &child2);
        QCOMPARE(QApplication::focusWidget(), nullptr);
    }

    {
        // window and children show, but window *is* active, children get focus
        QWidget window;
        window.setWindowTitle(QStringLiteral("#3 ") + __FUNCTION__);
        window.resize(m_testWidgetSize);
        window.move(windowPos);

        FocusWidget child1(&window);
        child1.setFocusPolicy(Qt::StrongFocus);

        QWidget child2(&window);
        child2.setFocusPolicy(Qt::StrongFocus);

        window.show();
        window.activateWindow();
        QVERIFY(QTest::qWaitForWindowExposed(&window));
        QTRY_VERIFY(QGuiApplication::focusWindow());

        child1.setFocus();
        QTRY_VERIFY(child1.hasFocus());
        QCOMPARE(window.focusWidget(), &child1);
        QCOMPARE(QApplication::focusWidget(), &child1);

        child2.setFocus();
        QVERIFY(child2.hasFocus());
        QCOMPARE(window.focusWidget(), &child2);
        QCOMPARE(QApplication::focusWidget(), &child2);

        // focus changed in between the events
        QCOMPARE(child1.widgetDuringFocusAboutToChange, &child1);
        QCOMPARE(child1.widgetDuringFocusOut, &child2);
    }

    {
        // window shown and active, children created, don't get focus, but get focus when shown
        QWidget window;
        window.setWindowTitle(QStringLiteral("#4 ") + __FUNCTION__);
        window.resize(m_testWidgetSize);
        window.move(windowPos);

        window.show();
        window.activateWindow();
        QVERIFY(QTest::qWaitForWindowExposed(&window));
        QTRY_VERIFY(QGuiApplication::focusWindow());

        QWidget child1(&window);
        child1.setFocusPolicy(Qt::StrongFocus);

        QWidget child2(&window);
        child2.setFocusPolicy(Qt::StrongFocus);

        child1.setFocus();
        QVERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child1.show();
        QApplication::processEvents();
        QTRY_VERIFY(child1.hasFocus());
        QCOMPARE(window.focusWidget(), &child1);
        QCOMPARE(QApplication::focusWidget(), &child1);

        child2.setFocus();
        QVERIFY(!child2.hasFocus());
        QCOMPARE(window.focusWidget(), &child1);
        QCOMPARE(QApplication::focusWidget(), &child1);

        child2.show();
        QVERIFY(child2.hasFocus());
        QCOMPARE(window.focusWidget(), &child2);
        QCOMPARE(QApplication::focusWidget(), &child2);
    }

    {
        // window shown and active, children created, don't get focus,
        // even after setFocus(), hide(), then show()
        QWidget window;
        window.setWindowTitle(QStringLiteral("#5 ") + __FUNCTION__);
        window.resize(m_testWidgetSize);
        window.move(windowPos);

        window.show();
        window.activateWindow();
        QVERIFY(QTest::qWaitForWindowExposed(&window));
        QTRY_VERIFY(QGuiApplication::focusWindow());

        QWidget child1(&window);
        child1.setFocusPolicy(Qt::StrongFocus);

        QWidget child2(&window);
        child2.setFocusPolicy(Qt::StrongFocus);

        child1.setFocus();
        QVERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child1.hide();
        QVERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child1.show();
        QVERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child2.setFocus();
        QVERIFY(!child2.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child2.hide();
        QVERIFY(!child2.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);

        child2.show();
        QVERIFY(!child2.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);
    }

    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(m_testWidgetSize);
        window.move(windowPos);

        FocusWidget child1(&window);
        QWidget child2(&window);

        window.show();
        window.activateWindow();
        QVERIFY(QTest::qWaitForWindowExposed(&window));
        QTRY_VERIFY(QApplication::focusWindow());

        QCOMPARE(QApplication::focusObject(), &window);

        child1.setFocus();
        QTRY_VERIFY(child1.hasFocus());
        QCOMPARE(window.focusWidget(), &child1);
        QCOMPARE(QApplication::focusWidget(), &child1);
        QCOMPARE(QApplication::focusObject(), &child1);
        QCOMPARE(child1.focusObjectDuringFocusIn, &child1);
        QVERIFY2(!child1.detectedBadEventOrdering,
            "focusObjectChanged should be delivered before widget focus events on setFocus");

        child1.clearFocus();
        QTRY_VERIFY(!child1.hasFocus());
        QCOMPARE(window.focusWidget(), nullptr);
        QCOMPARE(QApplication::focusWidget(), nullptr);
        QCOMPARE(QApplication::focusObject(), &window);
        QVERIFY(child1.focusObjectDuringFocusOut != &child1);
        QVERIFY2(!child1.detectedBadEventOrdering,
            "focusObjectChanged should be delivered before widget focus events on clearFocus");
    }
}

#ifndef QT_NO_CURSOR
void tst_QWidget::setCursor()
{
    {
        QWidget window;
        window.resize(200, 200);
        QWidget child(&window);

        QVERIFY(!window.testAttribute(Qt::WA_SetCursor));
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));

        window.setCursor(window.cursor());
        QVERIFY(window.testAttribute(Qt::WA_SetCursor));
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window.cursor().shape());
    }

    // do it again, but with window show()n
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget child(&window);
        window.show();

        QVERIFY(!window.testAttribute(Qt::WA_SetCursor));
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));

        window.setCursor(window.cursor());
        QVERIFY(window.testAttribute(Qt::WA_SetCursor));
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window.cursor().shape());
    }


    {
        QWidget window;
        window.resize(200, 200);
        QWidget child(&window);

        window.setCursor(Qt::WaitCursor);
        QVERIFY(window.testAttribute(Qt::WA_SetCursor));
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window.cursor().shape());
    }

    // same thing again, just with window show()n
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget child(&window);

        window.show();
        QVERIFY(QTest::qWaitForWindowExposed(&window));
        window.setCursor(Qt::WaitCursor);
        QVERIFY(window.testAttribute(Qt::WA_SetCursor));
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window.cursor().shape());
    }

    // reparenting child should not cause the WA_SetCursor to become set
    {
        QWidget window;
        window.resize(200, 200);
        QWidget window2;
        window2.resize(200, 200);
        QWidget child(&window);

        window.setCursor(Qt::WaitCursor);

        child.setParent(nullptr);
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), QCursor().shape());

        child.setParent(&window2);
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window2.cursor().shape());

            window2.setCursor(Qt::WaitCursor);
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window2.cursor().shape());
    }

    // again, with windows show()n
    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(200, 200);
        QWidget window2;
        window2.resize(200, 200);
        QWidget child(&window);

        window.setCursor(Qt::WaitCursor);
        window.show();

        child.setParent(nullptr);
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), QCursor().shape());

        child.setParent(&window2);
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window2.cursor().shape());

        window2.show();
        window2.setCursor(Qt::WaitCursor);
        QVERIFY(!child.testAttribute(Qt::WA_SetCursor));
        QCOMPARE(child.cursor().shape(), window2.cursor().shape());
    }

    // test if CursorChange is sent
    {
        QWidget widget;
        EventSpy<QWidget> spy(&widget, QEvent::CursorChange);
        QCOMPARE(spy.count(), 0);
        widget.setCursor(QCursor(Qt::WaitCursor));
        QCOMPARE(spy.count(), 1);
        widget.unsetCursor();
        QCOMPARE(spy.count(), 2);
    }
}
#endif

void tst_QWidget::setToolTip()
{
    if (QApplication::platformName().startsWith(QLatin1String("wayland")))
        QSKIP("Setting mouse cursor position is not possible on Wayland");

    QWidget widget;
    widget.resize(200, 200);
    // Showing the widget is not required for the tooltip event count test
    // to work. It should just prevent the application from becoming inactive
    // which would cause it to close all popups, interfering with the test
    // in the loop below.
    widget.setObjectName(QLatin1String("tst_qwidget setToolTip"));
    widget.setWindowTitle(widget.objectName());
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    EventSpy<QWidget> spy(&widget, QEvent::ToolTipChange);
    QCOMPARE(spy.count(), 0);

    QCOMPARE(widget.toolTip(), QString());
    widget.setToolTip(QString("Hello"));
    QCOMPARE(widget.toolTip(), QString("Hello"));
    QCOMPARE(spy.count(), 1);
    widget.setToolTip(QString());
    QCOMPARE(widget.toolTip(), QString());
    QCOMPARE(spy.count(), 2);

    const int wakeUpDelay = widget.style()->styleHint(QStyle::SH_ToolTip_WakeUpDelay);
    const int fallAsleepDelay = widget.style()->styleHint(QStyle::SH_ToolTip_FallAsleepDelay);

    for (int pass = 0; pass < 2; ++pass) {
        QCursor::setPos(m_safeCursorPos);
        QScopedPointer<QWidget> popup(new QWidget(nullptr, Qt::Popup));
        popup->setObjectName(QLatin1String("tst_qwidget setToolTip #") + QString::number(pass));
        popup->setWindowTitle(popup->objectName());
        popup->setGeometry(50, 50, 150, 50);
        QFrame *frame = new QFrame(popup.data());
        frame->setGeometry(0, 0, 50, 50);
        frame->setFrameStyle(QFrame::Box | QFrame::Plain);
        EventSpy<QWidget> spy1(frame, QEvent::ToolTip);
        EventSpy<QWidget> spy2(popup.data(), QEvent::ToolTip);
        frame->setMouseTracking(pass != 0);
        frame->setToolTip(QLatin1String("TOOLTIP FRAME"));
        popup->setToolTip(QLatin1String("TOOLTIP POPUP"));
        popup->show();
        QVERIFY(QTest::qWaitForWindowExposed(popup.data()));
        QWindow *popupWindow = popup->windowHandle();
        QTest::qWait(10);
        QTest::mouseMove(popupWindow, QPoint(25, 25));
        QTest::qWait(wakeUpDelay + 200);

        QCOMPARE(spy1.count(), 1);
        QCOMPARE(spy2.count(), 0);
        if (pass == 0)
            QTest::qWait(fallAsleepDelay + 200);
        QTest::mouseMove(popupWindow);
    }

    QTRY_COMPARE(QApplication::topLevelWidgets().size(), 1);
}

void tst_QWidget::testWindowIconChangeEventPropagation()
{
    typedef QSharedPointer<EventSpy<QWidget> > EventSpyPtr;
    typedef QSharedPointer<EventSpy<QWindow> > WindowEventSpyPtr;
    // Create widget hierarchy.
    QWidget topLevelWidget;
    topLevelWidget.setWindowTitle(QStringLiteral("TopLevel ") + __FUNCTION__);
    topLevelWidget.resize(m_testWidgetSize);
    topLevelWidget.move(m_availableTopLeft + QPoint(100, 100));
    QWidget topLevelChild(&topLevelWidget);

    QDialog dialog(&topLevelWidget);
    dialog.resize(m_testWidgetSize);
    dialog.move(topLevelWidget.geometry().topRight() + QPoint(100, 0));
    dialog.setWindowTitle(QStringLiteral("Dialog ") + __FUNCTION__);
    QWidget dialogChild(&dialog);

    QWidgetList widgets;
    widgets << &topLevelWidget << &topLevelChild
            << &dialog << &dialogChild;
    QCOMPARE(widgets.size(), 4);

    topLevelWidget.show();
    dialog.show();

    QWindowList windows;
    windows << topLevelWidget.windowHandle() << dialog.windowHandle();
    QWindow otherWindow;
    windows << &otherWindow;
    const int lastWidgetWindow = 1; // 0 and 1 are qwidgetwindow, 2 is a pure qwindow

    // Create spy lists.
    QList <EventSpyPtr> applicationEventSpies;
    QList <EventSpyPtr> widgetEventSpies;
    for (QWidget *widget : std::as_const(widgets)) {
        applicationEventSpies.append(EventSpyPtr::create(widget, QEvent::ApplicationWindowIconChange));
        widgetEventSpies.append(EventSpyPtr::create(widget, QEvent::WindowIconChange));
    }
    QList <WindowEventSpyPtr> appWindowEventSpies;
    QList <WindowEventSpyPtr> windowEventSpies;
    for (QWindow *window : std::as_const(windows)) {
        appWindowEventSpies.append(WindowEventSpyPtr::create(window, QEvent::ApplicationWindowIconChange));
        windowEventSpies.append(WindowEventSpyPtr::create(window, QEvent::WindowIconChange));
    }

    // QApplication::setWindowIcon
    const QIcon windowIcon = qApp->style()->standardIcon(QStyle::SP_TitleBarMenuButton);
    qApp->setWindowIcon(windowIcon);

    for (int i = 0; i < widgets.size(); ++i) {
        // Check QEvent::ApplicationWindowIconChange
        EventSpyPtr spy = applicationEventSpies.at(i);
        QWidget *widget = spy->widget();
        if (widget->isWindow()) {
            QCOMPARE(spy->count(), 1);
            QCOMPARE(widget->windowIcon(), windowIcon);
        } else {
            QCOMPARE(spy->count(), 0);
        }
        spy->clear();

        // Check QEvent::WindowIconChange
        spy = widgetEventSpies.at(i);
        QCOMPARE(spy->count(), 1);
        spy->clear();
    }
    for (int i = 0; i < windows.size(); ++i) {
        // Check QEvent::ApplicationWindowIconChange (sent to QWindow)
        // QWidgetWindows don't get this event, since the widget takes care of changing the icon
        WindowEventSpyPtr spy = appWindowEventSpies.at(i);
        QWindow *window = spy->widget();
        QCOMPARE(spy->count(), i > lastWidgetWindow ? 1 : 0);
        QCOMPARE(window->icon(), windowIcon);
        spy->clear();

        // Check QEvent::WindowIconChange (sent to QWindow)
        spy = windowEventSpies.at(i);
        QCOMPARE(spy->count(), 1);
        spy->clear();
    }

    // Set icon on a top-level widget.
    topLevelWidget.setWindowIcon(QIcon());

    for (int i = 0; i < widgets.size(); ++i) {
        // Check QEvent::ApplicationWindowIconChange
        EventSpyPtr spy = applicationEventSpies.at(i);
        QCOMPARE(spy->count(), 0);
        spy->clear();

        // Check QEvent::WindowIconChange
        spy = widgetEventSpies.at(i);
        QWidget *widget = spy->widget();
        if (widget == &topLevelWidget) {
            QCOMPARE(widget->windowIcon(), QIcon());
            QCOMPARE(spy->count(), 1);
        } else if (topLevelWidget.isAncestorOf(widget)) {
            QCOMPARE(spy->count(), 1);
        } else {
            QCOMPARE(spy->count(), 0);
        }
        spy->clear();
    }

    // Cleanup.
    qApp->setWindowIcon(QIcon());
}

void tst_QWidget::minAndMaxSizeWithX11BypassWindowManagerHint()
{
    if (m_platform != QStringLiteral("xcb"))
        QSKIP("This test is for X11 only.");
    // Same size as in QWidgetPrivate::create.
    const QSize desktopSize = QGuiApplication::primaryScreen()->size();
    const QSize originalSize(desktopSize.width() / 2, desktopSize.height() * 4 / 10);

    { // Maximum size.
    QWidget widget(nullptr, Qt::X11BypassWindowManagerHint);
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

    const QSize newMaximumSize = widget.size().boundedTo(originalSize) - QSize(10, 10);
    widget.setMaximumSize(newMaximumSize);
    QCOMPARE(widget.size(), newMaximumSize);

    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QCOMPARE(widget.size(), newMaximumSize);
    }

    { // Minimum size.
    QWidget widget(nullptr, Qt::X11BypassWindowManagerHint);
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

    const QSize newMinimumSize = widget.size().expandedTo(originalSize) + QSize(10, 10);
    widget.setMinimumSize(newMinimumSize);
    QCOMPARE(widget.size(), newMinimumSize);

    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QCOMPARE(widget.size(), newMinimumSize);
    }
}

class ShowHideShowWidget : public QWidget, public QAbstractNativeEventFilter
{
    Q_OBJECT

    int state = 0;
public:
    bool gotExpectedMapNotify = false;
    bool gotExpectedGlobalEvent = false;

    ShowHideShowWidget()
    {
        startTimer(1000);
    }

    void timerEvent(QTimerEvent *) override
    {
        switch (state++) {
        case 0:
            show();
            break;
        case 1:
            emit done();
            break;
        }
    }

    bool isMapNotify(const QByteArray &eventType, void *message)
    {
        enum { XCB_MAP_NOTIFY = 19 };
        if (state == 1 && eventType == QByteArrayLiteral("xcb_generic_event_t")) {
            // XCB events have a uint8 response_type member at the beginning.
            const auto responseType = *reinterpret_cast<const unsigned char *>(message);
            return ((responseType & ~0x80) == XCB_MAP_NOTIFY);
        }
        return false;
    }

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    bool nativeEvent(const QByteArray &eventType, void *message, qintptr *) override
#else
    bool nativeEvent(const QByteArray &eventType, void *message, long *) override
#endif
    {
        if (isMapNotify(eventType, message))
            gotExpectedMapNotify = true;
        return false;
    }

    // QAbstractNativeEventFilter interface
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *) override
#else
    bool nativeEventFilter(const QByteArray &eventType, void *message, long *) override
#endif
    {
        if (isMapNotify(eventType, message))
            gotExpectedGlobalEvent = true;
        return false;
    }

signals:
    void done();
};

void tst_QWidget::showHideShowX11()
{
    if (m_platform != QStringLiteral("xcb"))
        QSKIP("This test is for X11 only.");

    ShowHideShowWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    qApp->installNativeEventFilter(&w);

    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    w.hide();

    QEventLoop eventLoop;
    connect(&w, &ShowHideShowWidget::done, &eventLoop, &QEventLoop::quit);
    eventLoop.exec();

    QVERIFY(w.gotExpectedGlobalEvent);
    QVERIFY(w.gotExpectedMapNotify);
}

void tst_QWidget::clean_qt_x11_enforce_cursor()
{
    if (m_platform != QStringLiteral("xcb"))
        QSKIP("This test is for X11 only.");

    {
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        QWidget *w = new QWidget(&window);
        QWidget *child = new QWidget(w);
        child->setAttribute(Qt::WA_SetCursor, true);

        window.show();
        QApplicationPrivate::setActiveWindow(&window);
        QVERIFY(QTest::qWaitForWindowActive(&window));
        QTest::qWait(100);
        QCursor::setPos(window.geometry().center());
        QTest::qWait(100);

        child->setFocus();
        QTest::qWait(100);

        delete w;
    }

    QGraphicsScene scene;
    QLineEdit *edit = new QLineEdit;
    scene.addWidget(edit);

    // If the test didn't crash, then it passed.
}

class EventRecorder : public QObject
{
    Q_OBJECT

public:
    typedef QPair<QWidget *, QEvent::Type> WidgetEventTypePair;
    typedef QList<WidgetEventTypePair> EventList;

    using QObject::QObject;

    EventList eventList() const
    {
        return events;
    }

    void clear()
    {
        events.clear();
    }

    bool eventFilter(QObject *object, QEvent *event) override
    {
        QWidget *widget = qobject_cast<QWidget *>(object);
        if (widget && !event->spontaneous()) {
            switch (event->type()) {
            // we might get those events if we couldn't move the cursor
            case QEvent::Enter:
            case QEvent::Leave:
            // we might get this on systems that have an input method installed
            case QEvent::InputMethodQuery:
                break;
            default:
                events.append(qMakePair(widget, event->type()));
                break;
            }
        }
        return false;
    }

    static QByteArray msgEventListMismatch(const EventList &expected, const EventList &actual);
    static QByteArray msgExpectFailQtBug26424(const EventList &expected, const EventList &actual)
    { return QByteArrayLiteral("QTBUG-26424: ") + msgEventListMismatch(expected, actual); }

private:
    static inline void formatEventList(const EventList &l, QDebug &d);

    EventList events;
};

void EventRecorder::formatEventList(const EventList &l, QDebug &d)
{
    QWidget *lastWidget = nullptr;
    for (const WidgetEventTypePair &p : l) {
        if (p.first != lastWidget) {
            d << p.first << ':';
            lastWidget = p.first;
        }
        d << p.second << ' ';
    }
}

QByteArray EventRecorder::msgEventListMismatch(const EventList &expected, const EventList &actual)
{
    QString result;
    QDebug d = QDebug(&result).nospace();
    d << "Event list mismatch, expected " << expected.size() << " (";
    EventRecorder::formatEventList(expected, d);
    d << "), actual " << actual.size() << " (";
    EventRecorder::formatEventList(actual, d);
    d << ')';
    return result.toLocal8Bit();
}

void tst_QWidget::childEvents()
{
    EventRecorder::EventList expected;

    {
        // no children created, not shown
        QWidget widget;
        widget.resize(200, 200);
        EventRecorder spy;
        widget.installEventFilter(&spy);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 1)));

        QCoreApplication::sendPostedEvents();

        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::PolishRequest)
            << qMakePair(&widget, QEvent::Polish)
            << qMakePair(&widget, QEvent::Type(QEvent::User + 1));
        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
    }

    {
        // no children, shown
        QWidget widget;
        widget.resize(200, 200);
        EventRecorder spy;
        widget.installEventFilter(&spy);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 1)));

        widget.showNormal();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::Polish)
            << qMakePair(&widget, QEvent::PlatformSurface)
            << qMakePair(&widget, QEvent::WinIdChange)
            << qMakePair(&widget, QEvent::WindowIconChange)
            << qMakePair(&widget, QEvent::Move)
            << qMakePair(&widget, QEvent::Resize)
            << qMakePair(&widget, QEvent::Show)
#ifndef Q_OS_ANDROID
            << qMakePair(&widget, QEvent::CursorChange)
#endif
            << qMakePair(&widget, QEvent::ShowToParent);

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
        spy.clear();

        QCoreApplication::sendPostedEvents();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::PolishRequest)
            << qMakePair(&widget, QEvent::Type(QEvent::User + 1))
            << qMakePair(&widget, QEvent::UpdateLater)
            << qMakePair(&widget, QEvent::UpdateRequest);

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
    }

    {
        // 2 children, not shown
        QWidget widget;
        widget.resize(200, 200);
        EventRecorder spy;
        widget.installEventFilter(&spy);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 1)));

        QWidget child1(&widget);
        QWidget child2;
        child2.setParent(&widget);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 2)));

        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::ChildAdded)
            << qMakePair(&widget, QEvent::ChildAdded);
        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
        spy.clear();

        QCoreApplication::sendPostedEvents();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::PolishRequest)
            << qMakePair(&widget, QEvent::Polish)
            << qMakePair(&widget, QEvent::ChildPolished)
            << qMakePair(&widget, QEvent::ChildPolished)
            << qMakePair(&widget, QEvent::Type(QEvent::User + 1))
            << qMakePair(&widget, QEvent::Type(QEvent::User + 2));
        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
    }

    {
        // 2 children, widget shown
        QWidget widget;
        widget.resize(200, 200);
        EventRecorder spy;
        widget.installEventFilter(&spy);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 1)));

        QWidget child1(&widget);
        QWidget child2;
        child2.setParent(&widget);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 2)));

        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::ChildAdded)
            << qMakePair(&widget, QEvent::ChildAdded);
        QCOMPARE(spy.eventList(), expected);
        spy.clear();

        widget.showNormal();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::Polish)
            << qMakePair(&widget, QEvent::ChildPolished)
            << qMakePair(&widget, QEvent::ChildPolished)
            << qMakePair(&widget, QEvent::PlatformSurface)
            << qMakePair(&widget, QEvent::WinIdChange)
            << qMakePair(&widget, QEvent::WindowIconChange)
            << qMakePair(&widget, QEvent::Move)
            << qMakePair(&widget, QEvent::Resize)
            << qMakePair(&widget, QEvent::Show)
#ifndef Q_OS_ANDROID
            << qMakePair(&widget, QEvent::CursorChange)
#endif
            << qMakePair(&widget, QEvent::ShowToParent);

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
        spy.clear();

        QCoreApplication::sendPostedEvents();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::PolishRequest)
            << qMakePair(&widget, QEvent::Type(QEvent::User + 1))
            << qMakePair(&widget, QEvent::Type(QEvent::User + 2))
            << qMakePair(&widget, QEvent::UpdateLater)
            << qMakePair(&widget, QEvent::UpdateRequest);

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
    }

    {
        // 2 children, but one is reparented away, not shown
        QWidget widget;
        widget.resize(200, 200);
        EventRecorder spy;
        widget.installEventFilter(&spy);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 1)));

        QWidget child1(&widget);
        QWidget child2;
        child2.setParent(&widget);
        child2.setParent(nullptr);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 2)));

        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::ChildAdded)
            << qMakePair(&widget, QEvent::ChildAdded)
            << qMakePair(&widget, QEvent::ChildRemoved);
        QCOMPARE(spy.eventList(), expected);
        spy.clear();

        QCoreApplication::sendPostedEvents();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::PolishRequest)
            << qMakePair(&widget, QEvent::Polish)
            << qMakePair(&widget, QEvent::ChildPolished)
            << qMakePair(&widget, QEvent::Type(QEvent::User + 1))
            << qMakePair(&widget, QEvent::Type(QEvent::User + 2));

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
    }

    {
        // 2 children, but one is reparented away, then widget is shown
        QWidget widget;
        widget.resize(200, 200);
        EventRecorder spy;
        widget.installEventFilter(&spy);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 1)));

        QWidget child1(&widget);
        QWidget child2;
        child2.setParent(&widget);
        child2.setParent(nullptr);

        QCoreApplication::postEvent(&widget, new QEvent(QEvent::Type(QEvent::User + 2)));

        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::ChildAdded)
            << qMakePair(&widget, QEvent::ChildAdded)
            << qMakePair(&widget, QEvent::ChildRemoved);
        QCOMPARE(spy.eventList(), expected);
        spy.clear();

        widget.showNormal();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::Polish)
            << qMakePair(&widget, QEvent::ChildPolished)
            << qMakePair(&widget, QEvent::PlatformSurface)
            << qMakePair(&widget, QEvent::WinIdChange)
            << qMakePair(&widget, QEvent::WindowIconChange)
            << qMakePair(&widget, QEvent::Move)
            << qMakePair(&widget, QEvent::Resize)
            << qMakePair(&widget, QEvent::Show)
#ifndef Q_OS_ANDROID
            << qMakePair(&widget, QEvent::CursorChange)
#endif
            << qMakePair(&widget, QEvent::ShowToParent);

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
        spy.clear();

        QCoreApplication::sendPostedEvents();
        expected =
            EventRecorder::EventList()
            << qMakePair(&widget, QEvent::PolishRequest)
            << qMakePair(&widget, QEvent::Type(QEvent::User + 1))
            << qMakePair(&widget, QEvent::Type(QEvent::User + 2))
            << qMakePair(&widget, QEvent::UpdateLater)
            << qMakePair(&widget, QEvent::UpdateRequest);

        QVERIFY2(spy.eventList() == expected,
                 EventRecorder::msgEventListMismatch(expected, spy.eventList()).constData());
    }
}

class RenderWidget : public QWidget
{
public:
    RenderWidget(QWidget *source)
        : source(source), ellipse(false) {}

    void setEllipseEnabled(bool enable = true)
    {
        ellipse = enable;
        update();
    }

protected:
    void paintEvent(QPaintEvent *) override
    {
        if (ellipse) {
            QPainter painter(this);
            painter.fillRect(rect(), Qt::red);
            painter.end();
            QRegion regionToRender = QRegion(0, 0, source->width(), source->height() / 2,
                                             QRegion::Ellipse);
            source->render(this, QPoint(0, 30), regionToRender);
        } else {
            source->render(this);
        }
    }

private:
    QWidget *source;
    bool ellipse;
};

void tst_QWidget::render()
{
#ifdef Q_OS_ANDROID
    QSKIP("QTBUG-118984: crashes on Android.");
#endif
    QCalendarWidget source;
    source.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    // disable anti-aliasing to eliminate potential differences when subpixel antialiasing
    // is enabled on the screen
    QFont f;
    f.setStyleStrategy(QFont::NoAntialias);
    source.setFont(f);
    source.show();
    QVERIFY(QTest::qWaitForWindowExposed(&source));

    // Render the entire source into target.
    RenderWidget target(&source);
    target.resize(source.size());
    target.show();
    QVERIFY(QTest::qWaitForWindowExposed(&target));

    const QImage sourceImage = source.grab(QRect(QPoint(0, 0), QSize(-1, -1))).toImage();
    QImage targetImage = target.grab(QRect(QPoint(0, 0), QSize(-1, -1))).toImage();
    QTRY_COMPARE(sourceImage, targetImage);

    // Fill target.rect() will Qt::red and render
    // QRegion(0, 0, source->width(), source->height() / 2, QRegion::Ellipse)
    // of source into target with offset (0, 30).
    target.setEllipseEnabled();
    QCoreApplication::processEvents();
    QCoreApplication::sendPostedEvents();

    targetImage = target.grab(QRect(QPoint(0, 0), QSize(-1, -1))).toImage();
    QVERIFY(sourceImage != targetImage);

    QCOMPARE(targetImage.pixel(target.width() / 2, 29), QColor(Qt::red).rgb());
    if (targetImage.devicePixelRatioF() > 1)
        QEXPECT_FAIL("", "This test fails on high-DPI displays", Continue);
    QCOMPARE(targetImage.pixel(target.width() / 2, 30), sourceImage.pixel(source.width() / 2, 0));
}

// Test that a child widget properly fills its background
void tst_QWidget::renderChildFillsBackground()
{
    QWidget window;
    window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    window.resize(100, 100);
    // prevent custom styles
    window.setStyle(QStyleFactory::create(QLatin1String("Windows")));
    window.show();
    QVERIFY(QTest::qWaitForWindowExposed(&window));
    QWidget child(&window);
    child.resize(window.size());
    child.show();

    QCoreApplication::processEvents();
    const QPixmap childPixmap = child.grab(QRect(QPoint(0, 0), QSize(-1, -1)));
    const QPixmap windowPixmap = window.grab(QRect(QPoint(0, 0), QSize(-1, -1)));
#ifndef Q_OS_ANDROID
    // On Android all widgets are shown maximized, so the pixmaps
    // will be similar
    if (!m_platform.startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QEXPECT_FAIL("", "This test fails on all platforms", Continue);
#endif
    QCOMPARE(childPixmap, windowPixmap);
}

void tst_QWidget::renderTargetOffset()
{ // Check that the target offset is correct.
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.resize(200, 200);
    widget.setAutoFillBackground(true);
    widget.setPalette(Qt::red);
    // prevent custom styles
    widget.setStyle(QStyleFactory::create(QLatin1String("Windows")));
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QImage image(widget.size(), QImage::Format_RGB32);
    image.fill(QColor(Qt::blue).rgb());

    // Target offset (0, 0)
    widget.render(&image, QPoint(), QRect(20, 20, 100, 100));
    QCOMPARE(image.pixel(0, 0), QColor(Qt::red).rgb());
    QCOMPARE(image.pixel(99, 99), QColor(Qt::red).rgb());
    QCOMPARE(image.pixel(100, 100), QColor(Qt::blue).rgb());

    // Target offset (20, 20).
    image.fill(QColor(Qt::blue).rgb());
    widget.render(&image, QPoint(20, 20), QRect(20, 20, 100, 100));
    QCOMPARE(image.pixel(0, 0), QColor(Qt::blue).rgb());
    QCOMPARE(image.pixel(19, 19), QColor(Qt::blue).rgb());
    QCOMPARE(image.pixel(20, 20), QColor(Qt::red).rgb());
    QCOMPARE(image.pixel(119, 119), QColor(Qt::red).rgb());
    QCOMPARE(image.pixel(120, 120), QColor(Qt::blue).rgb());
}

// On some platforms the active palette is used instead of the inactive palette even
// though the widget is invisible, but for the renderInvisible test it doesn't matter,
// as we're mostly interested in testing the geometry, so just workaround the palette
// issue for now.
static void workaroundPaletteIssue(QWidget *widget)
{
    if (!widget)
        return;

    QWidget *navigationBar = widget->findChild<QWidget *>(QLatin1String("qt_calendar_navigationbar"));
    QVERIFY(navigationBar);

    QPalette palette = navigationBar->palette();
    const QColor background = palette.color(QPalette::Inactive, navigationBar->backgroundRole());
    const QColor highlightedText = palette.color(QPalette::Inactive, QPalette::HighlightedText);
    palette.setColor(QPalette::Active, navigationBar->backgroundRole(), background);
    palette.setColor(QPalette::Active, QPalette::HighlightedText, highlightedText);
    navigationBar->setPalette(palette);
}

//#define RENDER_DEBUG
void tst_QWidget::renderInvisible()
{
    if (m_platform == QStringLiteral("xcb"))
        QSKIP("QTBUG-26424");

    if (m_platform.startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: Skip this test, see also QTBUG-107157");

    QScopedPointer<QCalendarWidget> calendar(new QCalendarWidget);
    calendar->move(m_availableTopLeft + QPoint(100, 100));
    calendar->setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    // disable anti-aliasing to eliminate potential differences when subpixel antialiasing
    // is enabled on the screen
    QFont f;
    f.setStyleStrategy(QFont::NoAntialias);
    calendar->setFont(f);
    calendar->showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(calendar.data()));

    // Create a dummy focus widget to get rid of focus rect in reference image.
    QLineEdit dummyFocusWidget;
    dummyFocusWidget.setMinimumWidth(m_testWidgetSize.width());
    dummyFocusWidget.move(calendar->geometry().bottomLeft() + QPoint(0, 100));
    dummyFocusWidget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&dummyFocusWidget));

    // Create normal reference image.
    const QSize calendarSize = calendar->size();
    QImage referenceImage(calendarSize, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&referenceImage);
#ifdef RENDER_DEBUG
    referenceImage.save("referenceImage.png");
#endif
    QVERIFY(!referenceImage.isNull());

    // Create resized reference image.
    const QSize calendarSizeResized = calendar->size() + QSize(50, 50);
    calendar->resize(calendarSizeResized);
    QTest::qWait(30);
    QImage referenceImageResized(calendarSizeResized, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&referenceImageResized);
#ifdef RENDER_DEBUG
    referenceImageResized.save("referenceImageResized.png");
#endif
    QVERIFY(!referenceImageResized.isNull());

    // Explicitly hide the calendar.
    calendar->hide();
    QTest::qWait(30);
    workaroundPaletteIssue(calendar.data());

    { // Make sure we get the same image when the calendar is explicitly hidden.
    QImage testImage(calendarSizeResized, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("explicitlyHiddenCalendarResized.png");
#endif
    QCOMPARE(testImage, referenceImageResized);
    }

    // Now that we have reference images we can delete the source and re-create
    // the calendar and check that we get the same images from a calendar which has never
    // been visible, laid out or created (Qt::WA_WState_Created).
    calendar.reset(new QCalendarWidget);
    calendar->setFont(f);
    workaroundPaletteIssue(calendar.data());

    { // Never been visible, created or laid out.
    QImage testImage(calendarSize, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("neverBeenVisibleCreatedOrLaidOut.png");
#endif
    QCOMPARE(testImage, referenceImage);
    }

    calendar->hide();
    QTest::qWait(30);

    { // Calendar explicitly hidden.
    QImage testImage(calendarSize, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("explicitlyHiddenCalendar.png");
#endif
    QCOMPARE(testImage, referenceImage);
    }

    // Get navigation bar and explicitly hide it.
    QWidget *navigationBar = calendar.data()->findChild<QWidget *>(QLatin1String("qt_calendar_navigationbar"));
    QVERIFY(navigationBar);
    navigationBar->hide();

    { // Check that the navigation bar isn't drawn when rendering the entire calendar.
    QImage testImage(calendarSize, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("calendarWithoutNavigationBar.png");
#endif
    QVERIFY(testImage != referenceImage);
    }

    { // Make sure the navigation bar renders correctly even though it's hidden.
    QImage testImage(navigationBar->size(), QImage::Format_ARGB32_Premultiplied);
    navigationBar->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("explicitlyHiddenNavigationBar.png");
#endif
    QCOMPARE(testImage, referenceImage.copy(navigationBar->rect()));
    }

    // Get next month button.
    QWidget *nextMonthButton = navigationBar->findChild<QWidget *>(QLatin1String("qt_calendar_nextmonth"));
    QVERIFY(nextMonthButton);

    { // Render next month button.
    // Fill test image with correct background color.
    QImage testImage(nextMonthButton->size(), QImage::Format_ARGB32_Premultiplied);
    navigationBar->render(&testImage, QPoint(), QRegion(), QWidget::RenderFlags());
#ifdef RENDER_DEBUG
    testImage.save("nextMonthButtonBackground.png");
#endif

    // Set the button's background color to Qt::transparent; otherwise it will fill the
    // background with QPalette::Window.
    const QPalette originalPalette = nextMonthButton->palette();
    QPalette palette = originalPalette;
    palette.setColor(QPalette::Window, Qt::transparent);
    nextMonthButton->setPalette(palette);

    // Render the button on top of the background.
    nextMonthButton->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("nextMonthButton.png");
#endif
    const QRect buttonRect(nextMonthButton->mapTo(calendar.data(), QPoint()), nextMonthButton->size());
    QCOMPARE(testImage, referenceImage.copy(buttonRect));

    // Restore palette.
    nextMonthButton->setPalette(originalPalette);
    }

    // Navigation bar isn't explicitly hidden anymore.
    navigationBar->show();
    QTest::qWait(30);
    QVERIFY(!calendar->isVisible());

    // Now, completely mess up the layout. This will trigger an update on the layout
    // when the calendar is visible or shown, but it's not. QWidget::render must therefore
    // make sure the layout is activated before rendering.
    QVERIFY(!calendar->isVisible());
    calendar->resize(calendarSizeResized);
    QCoreApplication::processEvents();

    { // Make sure we get an image equal to the resized reference image.
    QImage testImage(calendarSizeResized, QImage::Format_ARGB32_Premultiplied);
    calendar->render(&testImage);
#ifdef RENDER_DEBUG
    testImage.save("calendarResized.png");
#endif
    QCOMPARE(testImage, referenceImageResized);
    }

    { // Make sure we lay out the widget correctly the first time it's rendered.
    QCalendarWidget calendar;
    const QSize calendarSize = calendar.sizeHint();

    QImage image(2 * calendarSize, QImage::Format_ARGB32_Premultiplied);
    image.fill(QColor(Qt::red).rgb());
    calendar.render(&image);

    for (int i = calendarSize.height(); i < 2 * calendarSize.height(); ++i)
        for (int j = calendarSize.width(); j < 2 * calendarSize.width(); ++j)
            QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
    }

    { // Ensure that we don't call adjustSize() on invisible top-levels if render() is called
      // right after widgets have been added/removed to/from its layout.
    QWidget topLevel;
    topLevel.setLayout(new QVBoxLayout);

    QWidget *widget = new QLineEdit;
    topLevel.layout()->addWidget(widget);

    const QSize initialSize = topLevel.size();
    QPixmap pixmap(topLevel.sizeHint());
    topLevel.render(&pixmap); // triggers adjustSize()
    const QSize finalSize = topLevel.size();
    QVERIFY2(finalSize != initialSize,
             msgComparisonFailed(finalSize, "!=", initialSize));

    topLevel.layout()->removeWidget(widget);
    QCOMPARE(topLevel.size(), finalSize);
    topLevel.render(&pixmap);
    QCOMPARE(topLevel.size(), finalSize);

    topLevel.layout()->addWidget(widget);
    QCOMPARE(topLevel.size(), finalSize);
    topLevel.render(&pixmap);
    QCOMPARE(topLevel.size(), finalSize);
    }
}

void tst_QWidget::renderWithPainter()
{
    QWidget widget(nullptr, Qt::Tool);
    // prevent custom styles

    const QScopedPointer<QStyle> style(QStyleFactory::create(QLatin1String("Windows")));
    widget.setStyle(style.data());
    widget.show();
    widget.resize(70, 50);
    widget.setAutoFillBackground(true);
    widget.setPalette(Qt::black);

    // Render the entire widget onto the image.
    QImage image(QSize(70, 50), QImage::Format_ARGB32);
    image.fill(QColor(Qt::red).rgb());
    QPainter painter(&image);
    widget.render(&painter);

    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j)
            QCOMPARE(image.pixel(j, i), QColor(Qt::black).rgb());
    }

    // Translate painter (10, 10).
    painter.save();
    image.fill(QColor(Qt::red).rgb());
    painter.translate(10, 10);
    widget.render(&painter);
    painter.restore();

    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (i < 10 || j < 10)
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::black).rgb());
        }
    }

    // Pass target offset (10, 10) (the same as QPainter::translate).
    image.fill(QColor(Qt::red).rgb());
    widget.render(&painter, QPoint(10, 10));

    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (i < 10 || j < 10)
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::black).rgb());
        }
    }

    // Translate (10, 10) and pass target offset (10, 10).
    painter.save();
    image.fill(QColor(Qt::red).rgb());
    painter.translate(10, 10);
    widget.render(&painter, QPoint(10, 10));
    painter.restore();

    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (i < 20 || j < 20)
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::black).rgb());
        }
    }

    // Rotate painter 90 degrees.
    painter.save();
    image.fill(QColor(Qt::red).rgb());
    painter.rotate(90);
    widget.render(&painter);
    painter.restore();

    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j)
            QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
    }

    // Translate and rotate.
    image.fill(QColor(Qt::red).rgb());
    widget.resize(40, 10);
    painter.translate(10, 10);
    painter.rotate(90);
    widget.render(&painter);

    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (i >= 10 && j >= 0 && j < 10)
                QCOMPARE(image.pixel(j, i), QColor(Qt::black).rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
        }
    }

    // Make sure QWidget::render does not modify the render hints set on the painter.
    painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform
                           | QPainter::TextAntialiasing);
    QPainter::RenderHints oldRenderHints = painter.renderHints();
    widget.render(&painter);
    QCOMPARE(painter.renderHints(), oldRenderHints);
}

void tst_QWidget::renderRTL()
{
    QFont f;
    f.setStyleStrategy(QFont::NoAntialias);
    const QScopedPointer<QStyle> style(QStyleFactory::create(QLatin1String("Windows")));

    QMenu menu;
    menu.setMinimumWidth(200);
    menu.setFont(f);
    menu.setStyle(style.data());
    menu.addAction("I");
    menu.show();
    menu.setLayoutDirection(Qt::LeftToRight);
    QVERIFY(QTest::qWaitForWindowExposed(&menu));

    QImage imageLTR(menu.size(), QImage::Format_ARGB32);
    menu.render(&imageLTR);
    //imageLTR.save("/tmp/rendered_1.png");

    menu.setLayoutDirection(Qt::RightToLeft);
    QImage imageRTL(menu.size(), QImage::Format_ARGB32);
    menu.render(&imageRTL);
    imageRTL = imageRTL.mirrored(true, false);
    //imageRTL.save("/tmp/rendered_2.png");

    QCOMPARE(imageLTR.height(), imageRTL.height());
    QCOMPARE(imageLTR.width(), imageRTL.width());
    static constexpr auto border = 4;
    for (int h = border; h < imageRTL.height() - border; ++h) {
        // there should be no difference on the right (aka no text)
        for (int w = imageRTL.width() / 2; w < imageRTL.width() - border; ++w) {
            auto pixLTR = imageLTR.pixel(w, h);
            auto pixRTL = imageRTL.pixel(w, h);
            if (pixLTR != pixRTL)
                qDebug() << "Pixel do not match at" << w << h << ":"
                         << Qt::hex << pixLTR << "<->" << pixRTL;
            QCOMPARE(pixLTR, pixRTL);
        }
    }
}

void tst_QWidget::render_task188133()
{
    QMainWindow mainWindow;

    // Make sure QWidget::render does not trigger QWidget::repaint/update
    // and asserts for Qt::WA_WState_Created.
    const QPixmap pixmap = mainWindow.grab(QRect(QPoint(0, 0), QSize(-1, -1)));
    Q_UNUSED(pixmap);
}

void tst_QWidget::render_task211796()
{
    class MyWidget : public QWidget
    {
        void resizeEvent(QResizeEvent *) override
        {
            QPixmap pixmap(size());
            render(&pixmap);
        }
    };

    { // Please don't die in a resize recursion.
        MyWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        widget.resize(m_testWidgetSize);
        centerOnScreen(&widget);
        widget.show();
    }

    { // Same check with a deeper hierarchy.
        QWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        widget.resize(m_testWidgetSize);
        centerOnScreen(&widget);
        widget.show();
        QWidget child(&widget);
        MyWidget grandChild;
        grandChild.setParent(&child);
        grandChild.resize(100, 100);
        child.show();
    }
}

void tst_QWidget::render_task217815()
{
    // Make sure we don't change the size of the widget when calling
    // render() and the widget has an explicit size set.
    // This was a problem on Windows because we called createWinId(),
    // which in turn enforced the size to be bigger than the smallest
    // possible native window size (which is (115,something) on WinXP).
    QWidget widget;
    const QSize explicitSize(80, 20);
    widget.resize(explicitSize);
    QCOMPARE(widget.size(), explicitSize);

    QPixmap pixmap(explicitSize);
    widget.render(&pixmap);

    QCOMPARE(widget.size(), explicitSize);
}

// Window Opacity is not supported on Windows CE.
void tst_QWidget::render_windowOpacity()
{
    if (m_platform == QStringLiteral("offscreen"))
        QSKIP("Platform offscreen does not support setting opacity");

    const qreal opacity = 0.5;

    { // Check that the painter opacity effects the widget drawing.
    QWidget topLevel;
    QWidget child(&topLevel);
    child.resize(50, 50);
    child.setPalette(Qt::red);
    child.setAutoFillBackground(true);

    QPixmap expected(child.size());

    if (m_platform == QStringLiteral("xcb") && expected.depth() < 24)
        QSKIP("This test won't give correct results with dithered pixmaps");

    expected.fill(Qt::green);
    QPainter painter(&expected);
    painter.setOpacity(opacity);
    painter.fillRect(QRect(QPoint(0, 0), child.size()), Qt::red);
    painter.end();

    QPixmap result(child.size());
    result.fill(Qt::green);
    painter.begin(&result);
    painter.setOpacity(opacity);
    child.render(&painter);
    painter.end();
    QCOMPARE(result, expected);
    }

    { // Combine the opacity set on the painter with the widget opacity.
    class MyWidget : public QWidget
    {
    public:
        explicit MyWidget(qreal opacityIn) : opacity(opacityIn) {}
        void paintEvent(QPaintEvent *) override
        {
            QPainter painter(this);
            painter.setOpacity(opacity);
            QCOMPARE(painter.opacity(), opacity);
            painter.fillRect(rect(), Qt::red);
        }
        const qreal opacity;
    };

    MyWidget widget(opacity);
    widget.resize(50, 50);
    widget.setPalette(Qt::blue);
    widget.setAutoFillBackground(true);

    QPixmap expected(widget.size());
    expected.fill(Qt::green);
    QPainter painter(&expected);
    painter.setOpacity(opacity);
    QPixmap pixmap(widget.size());
    pixmap.fill(Qt::blue);
    QPainter pixmapPainter(&pixmap);
    pixmapPainter.setOpacity(opacity);
    pixmapPainter.fillRect(QRect(QPoint(), widget.size()), Qt::red);
    painter.drawPixmap(QPoint(), pixmap);
    painter.end();

    QPixmap result(widget.size());
    result.fill(Qt::green);
    painter.begin(&result);
    painter.setOpacity(opacity);
    widget.render(&painter);
    painter.end();
    QCOMPARE(result, expected);
    }
}

void tst_QWidget::render_systemClip()
{
    QWidget widget;
    widget.setPalette(Qt::blue);
    widget.resize(100, 100);

    QImage image(widget.size(), QImage::Format_RGB32);
    image.fill(QColor(Qt::red).rgb());

    QPaintEngine *paintEngine = image.paintEngine();
    QVERIFY(paintEngine);
    paintEngine->setSystemClip(QRegion(0, 0, 50, 50));

    QPainter painter(&image);
    // Make sure we're using the same paint engine and has the right clip set.
    QCOMPARE(painter.paintEngine(), paintEngine);
    QCOMPARE(paintEngine->systemClip(), QRegion(0, 0, 50, 50));

    // Translate painter outside system clip.
    painter.translate(50, 0);
    widget.render(&painter);

#ifdef RENDER_DEBUG
    image.save("outside_systemclip.png");
#endif

    // All pixels should be red.
    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j)
            QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
    }

    // Restore painter and refill image with red.
    image.fill(QColor(Qt::red).rgb());
    painter.translate(-50, 0);

    // Set transform on the painter.
    QTransform transform;
    transform.shear(0, 1);
    painter.setTransform(transform);
    widget.render(&painter);

#ifdef RENDER_DEBUG
    image.save("blue_triangle.png");
#endif

    // We should now have a blue triangle starting at scan line 1, and the rest should be red.
    // rrrrrrrrrr
    // brrrrrrrrr
    // bbrrrrrrrr
    // bbbrrrrrrr
    // bbbbrrrrrr
    // rrrrrrrrrr
    // ...

#ifndef Q_OS_MACOS
    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (i < 50 && j < i)
                QCOMPARE(image.pixel(j, i), QColor(Qt::blue).rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
        }
    }
#else
    // We don't paint directly on the image on the Mac, so we cannot do the pixel comparison
    // as above due to QPainter::SmoothPixmapTransform. We therefore need to generate an
    // expected image by first painting on a pixmap, and then draw the pixmap onto
    // the image using QPainter::SmoothPixmapTransform. Then we can compare pixels :)
    // The check is basically the same, except that it takes the smoothening into account.
    QPixmap pixmap(50, 50);
    const QRegion sysClip(0, 0, 50, 50);
    widget.render(&pixmap, QPoint(), sysClip);

    QImage expectedImage(widget.size(), QImage::Format_RGB32);
    expectedImage.fill(QColor(Qt::red).rgb());
    expectedImage.paintEngine()->setSystemClip(sysClip);

    QPainter expectedImagePainter(&expectedImage);
    expectedImagePainter.setTransform(QTransform().shear(0, 1));
    // NB! This is the important part (SmoothPixmapTransform).
    expectedImagePainter.setRenderHints(QPainter::SmoothPixmapTransform);
    expectedImagePainter.drawPixmap(QPoint(0, 0), pixmap);
    expectedImagePainter.end();

    QCOMPARE(image, expectedImage);
#endif
}

void tst_QWidget::render_systemClip2_data()
{
    QTest::addColumn<bool>("autoFillBackground");
    QTest::addColumn<bool>("usePaintEvent");
    QTest::addColumn<QColor>("expectedColor");

    QTest::newRow("Only auto-fill background") << true << false << QColor(Qt::blue);
    QTest::newRow("Only draw in paintEvent") << false << true << QColor(Qt::green);
    QTest::newRow("Auto-fill background and draw in paintEvent") << true << true << QColor(Qt::green);
}

void tst_QWidget::render_systemClip2()
{
    QFETCH(bool, autoFillBackground);
    QFETCH(bool, usePaintEvent);
    QFETCH(QColor, expectedColor);

    QVERIFY2(expectedColor != QColor(Qt::red), "Qt::red is the reference color for the image, pick another color");

    class MyWidget : public QWidget
    {
    public:
        explicit MyWidget(bool usePaintEventIn) : usePaintEvent(usePaintEventIn) {}
        const bool usePaintEvent;
        void paintEvent(QPaintEvent *) override
        {
            if (usePaintEvent)
                QPainter(this).fillRect(rect(), Qt::green);
        }
    };

    MyWidget widget(usePaintEvent);
    widget.setPalette(Qt::blue);
    // NB! widget.setAutoFillBackground(autoFillBackground) won't do the
    // trick here since the widget is a top-level. The background is filled
    // regardless, unless Qt::WA_OpaquePaintEvent or Qt::WA_NoSystemBackground
    // is set. We therefore use the opaque attribute to turn off auto-fill.
    if (!autoFillBackground)
        widget.setAttribute(Qt::WA_OpaquePaintEvent);
    widget.resize(100, 100);

    QImage image(widget.size(), QImage::Format_RGB32);
    image.fill(QColor(Qt::red).rgb());

    QPaintEngine *paintEngine = image.paintEngine();
    QVERIFY(paintEngine);

    QRegion systemClip(QRegion(50, 0, 50, 10));
    systemClip += QRegion(90, 10, 10, 40);
    paintEngine->setSystemClip(systemClip);

    // Render entire widget directly onto device.
    widget.render(&image);

#ifdef RENDER_DEBUG
    image.save("systemclip_with_device.png");
#endif
    // All pixels within the system clip should now be
    // the expectedColor, and the rest should be red.
    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (systemClip.contains(QPoint(j, i)))
                QCOMPARE(image.pixel(j, i), expectedColor.rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
        }
    }

    // Refill image with red.
    image.fill(QColor(Qt::red).rgb());
    paintEngine->setSystemClip(systemClip);

    // Do the same with an untransformed painter.
    QPainter painter(&image);
    //Make sure we're using the same paint engine and has the right clip set.
    QCOMPARE(painter.paintEngine(), paintEngine);
    QCOMPARE(paintEngine->systemClip(), systemClip);

    widget.render(&painter);

#ifdef RENDER_DEBUG
    image.save("systemclip_with_untransformed_painter.png");
#endif
    // All pixels within the system clip should now be
    // the expectedColor, and the rest should be red.
    for (int i = 0; i < image.height(); ++i) {
        for (int j = 0; j < image.width(); ++j) {
            if (systemClip.contains(QPoint(j, i)))
                QCOMPARE(image.pixel(j, i), expectedColor.rgb());
            else
                QCOMPARE(image.pixel(j, i), QColor(Qt::red).rgb());
        }
    }
}

void tst_QWidget::render_systemClip3_data()
{
    QTest::addColumn<QSize>("size");
    QTest::addColumn<bool>("useSystemClip");

    // Reference: http://en.wikipedia.org/wiki/Flag_of_Norway
    QTest::newRow("Norwegian Civil Flag") << QSize(220, 160) << false;
    QTest::newRow("Norwegian War Flag") << QSize(270, 160) << true;
}

// This test ensures that the current engine clip (systemClip + painter clip)
// is preserved after QPainter::setClipRegion(..., Qt::ReplaceClip);
void tst_QWidget::render_systemClip3()
{
    QFETCH(QSize, size);
    QFETCH(bool, useSystemClip);

    // Calculate the inner/outer cross of the flag.
    QRegion outerCross(0, 0, size.width(), size.height());
    outerCross -= QRect(0, 0, 60, 60);
    outerCross -= QRect(100, 0, size.width() - 100, 60);
    outerCross -= QRect(0, 100, 60, 60);
    outerCross -= QRect(100, 100, size.width() - 100, 60);

    QRegion innerCross(0, 0, size.width(), size.height());
    innerCross -= QRect(0, 0, 70, 70);
    innerCross -= QRect(90, 0, size.width() - 90, 70);
    innerCross -= QRect(0, 90, 70, 70);
    innerCross -= QRect(90, 90, size.width() - 90, 70);

    const QRegion redArea(QRegion(0, 0, size.width(), size.height()) - outerCross);
    const QRegion whiteArea(outerCross - innerCross);
    QRegion systemClip;

    // Okay, here's the image that should look like a Norwegian civil/war flag in the end.
    QImage flag(size, QImage::Format_ARGB32);
    flag.fill(QColor(Qt::transparent).rgba());

    if (useSystemClip) {
        QPainterPath warClip(QPoint(size.width(), 0));
        warClip.lineTo(size.width() - 110, 60);
        warClip.lineTo(size.width(), 80);
        warClip.lineTo(size.width() - 110, 100);
        warClip.lineTo(size.width(), 160);
        warClip.closeSubpath();
        systemClip = QRegion(0, 0, size.width(), size.height()) - QRegion(warClip.toFillPolygon().toPolygon());
        flag.paintEngine()->setSystemClip(systemClip);
    }

    QPainter painter(&flag);
    painter.fillRect(QRect(QPoint(), size), Qt::red); // Fill image background with red.
    painter.setClipRegion(outerCross); // Limit widget painting to inside the outer cross.

    // Here's the widget that's supposed to draw the inner/outer cross of the flag.
    // The outer cross (white) should be drawn when the background is auto-filled, and
    // the inner cross (blue) should be drawn in the paintEvent.
    class MyWidget : public QWidget
    {
    public:
        void paintEvent(QPaintEvent *) override
        {
            QPainter painter(this);
            // Be evil and try to paint outside the outer cross. This should not be
            // possible since the shared painter is clipped to the outer cross.
            painter.setClipRect(0, 0, 60, 60, Qt::ReplaceClip);
            painter.fillRect(rect(), Qt::green);
            painter.setClipRegion(clip, Qt::ReplaceClip);
            painter.fillRect(rect(), Qt::blue);
        }
        QRegion clip;
    };

    MyWidget widget;
    widget.clip = innerCross;
    widget.setFixedSize(size);
    widget.setPalette(Qt::white);
    widget.setAutoFillBackground(true);
    widget.render(&painter);

#ifdef RENDER_DEBUG
    flag.save("flag.png");
#endif

    // Let's make sure we got a Norwegian flag.
    for (int i = 0; i < flag.height(); ++i) {
        for (int j = 0; j < flag.width(); ++j) {
            const QPoint pixel(j, i);
            const QRgb pixelValue = flag.pixel(pixel);
            if (useSystemClip && !systemClip.contains(pixel))
                QCOMPARE(pixelValue, QColor(Qt::transparent).rgba());
            else if (redArea.contains(pixel))
                QCOMPARE(pixelValue, QColor(Qt::red).rgba());
            else if (whiteArea.contains(pixel))
                QCOMPARE(pixelValue, QColor(Qt::white).rgba());
            else
                QCOMPARE(pixelValue, QColor(Qt::blue).rgba());
        }
    }
}

void tst_QWidget::render_task252837()
{
    QWidget widget;
    widget.resize(200, 200);

    QPixmap pixmap(widget.size());
    QPainter painter(&pixmap);
    // Please do not crash.
    widget.render(&painter);
}

void tst_QWidget::render_worldTransform()
{
    class MyWidget : public QWidget
    {
    public:
        void paintEvent(QPaintEvent *) override
        {
            QPainter painter(this);
            // Make sure world transform is identity.
            QCOMPARE(painter.worldTransform(), QTransform());

            // Make sure device transform is correct.
            const QPoint widgetOffset = geometry().topLeft();
            QTransform expectedDeviceTransform = QTransform::fromTranslate(105, 5);
            expectedDeviceTransform.rotate(90);
            expectedDeviceTransform.translate(widgetOffset.x(), widgetOffset.y());
            QCOMPARE(painter.deviceTransform(), expectedDeviceTransform);

            // Set new world transform.
            QTransform newWorldTransform = QTransform::fromTranslate(10, 10);
            newWorldTransform.rotate(90);
            painter.setWorldTransform(newWorldTransform);
            QCOMPARE(painter.worldTransform(), newWorldTransform);

            // Again, check device transform.
            expectedDeviceTransform.translate(10, 10);
            expectedDeviceTransform.rotate(90);
            QCOMPARE(painter.deviceTransform(), expectedDeviceTransform);

            painter.fillRect(QRect(0, 0, 20, 10), Qt::green);
        }
    };

    MyWidget widget;
    widget.setFixedSize(100, 100);
    widget.setPalette(Qt::red);
    widget.setAutoFillBackground(true);

    MyWidget child;
    child.setParent(&widget);
    child.move(50, 50);
    child.setFixedSize(50, 50);
    child.setPalette(Qt::blue);
    child.setAutoFillBackground(true);

    QImage image(QSize(110, 110), QImage::Format_RGB32);
    image.fill(QColor(Qt::black).rgb());

    QPainter painter(&image);
    painter.translate(105, 5);
    painter.rotate(90);

    // Render widgets onto image.
    widget.render(&painter);
#ifdef RENDER_DEBUG
    image.save("render_worldTransform_image.png");
#endif

    // Ensure the transforms are unchanged after render.
    QCOMPARE(painter.worldTransform(), painter.worldTransform());
    QCOMPARE(painter.deviceTransform(), painter.deviceTransform());
    painter.end();

    // Paint expected image.
    QImage expected(QSize(110, 110), QImage::Format_RGB32);
    expected.fill(QColor(Qt::black).rgb());

    QPainter expectedPainter(&expected);
    expectedPainter.translate(105, 5);
    expectedPainter.rotate(90);
    expectedPainter.save();
    expectedPainter.fillRect(widget.rect(),Qt::red);
    expectedPainter.translate(10, 10);
    expectedPainter.rotate(90);
    expectedPainter.fillRect(QRect(0, 0, 20, 10), Qt::green);
    expectedPainter.restore();
    expectedPainter.translate(50, 50);
    expectedPainter.fillRect(child.rect(),Qt::blue);
    expectedPainter.translate(10, 10);
    expectedPainter.rotate(90);
    expectedPainter.fillRect(QRect(0, 0, 20, 10), Qt::green);
    expectedPainter.end();

#ifdef RENDER_DEBUG
    expected.save("render_worldTransform_expected.png");
#endif

    QCOMPARE(image, expected);
}

void tst_QWidget::setContentsMargins()
{
    QLabel label("why does it always rain on me?");
    QSize oldSize = label.sizeHint();
    label.setFrameStyle(QFrame::Sunken | QFrame::Box);
    QSize newSize = label.sizeHint();
    QVERIFY2(oldSize != newSize, msgComparisonFailed(oldSize, "!=", newSize));

    QLabel label2("why does it always rain on me?");
    label2.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    label2.show();
    label2.setFrameStyle(QFrame::Sunken | QFrame::Box);
    QCOMPARE(newSize, label2.sizeHint());

    QLabel label3("why does it always rain on me?");
    label3.setFrameStyle(QFrame::Sunken | QFrame::Box);
    QCOMPARE(newSize, label3.sizeHint());
}

void tst_QWidget::moveWindowInShowEvent_data()
{
    QTest::addColumn<QPoint>("initial");
    QTest::addColumn<QPoint>("position");

    QPoint p = m_availableTopLeft;

    QTest::newRow("1") << p << (p + QPoint(10, 10));
    QTest::newRow("2") << (p + QPoint(10,10)) << p;
}

void tst_QWidget::moveWindowInShowEvent()
{
    if (m_platform == QStringLiteral("xcb"))
        QSKIP("QTBUG-26424");

    QFETCH(QPoint, initial);
    QFETCH(QPoint, position);

    class MoveWindowInShowEventWidget : public QWidget
    {
    public:
        QPoint position;
        void showEvent(QShowEvent *) override
        {
            move(position);
        }
    };

    MoveWindowInShowEventWidget widget;
    QScreen *screen = QGuiApplication::primaryScreen();
    widget.resize(QSize(screen->availableGeometry().size() / 3).expandedTo(QSize(1, 1)));
    // move to this position in showEvent()
    widget.position = position;

    // put the widget in it's starting position
    widget.move(initial);
    QCOMPARE(widget.pos(), initial);

    // show it
    widget.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    // it should have moved
    QCOMPARE(widget.pos(), position);
}

void tst_QWidget::repaintWhenChildDeleted()
{
    ColorWidget w(nullptr, Qt::FramelessWindowHint, Qt::red);
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    const QPoint startPoint = m_availableTopLeft + QPoint(50, 50);
    w.setGeometry(QRect(startPoint, QSize(100, 100)));
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    QTRY_COMPARE(w.r, QRegion(w.rect()));
    w.r = QRegion();

    {
        ColorWidget child(&w, Qt::Widget, Qt::blue);
        child.setGeometry(10, 10, 10, 10);
        child.show();
        QTRY_COMPARE(child.r, QRegion(child.rect()));
        w.r = QRegion();
    }

    QTRY_COMPARE(w.r, QRegion(10, 10, 10, 10));
}

// task 175114
void tst_QWidget::hideOpaqueChildWhileHidden()
{
    ColorWidget w(nullptr, Qt::FramelessWindowHint, Qt::red);
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    const QPoint startPoint = m_availableTopLeft + QPoint(50, 50);
    w.setGeometry(QRect(startPoint, QSize(100, 100)));

    ColorWidget child(&w, Qt::Widget, Qt::blue);
    child.setGeometry(10, 10, 80, 80);

    ColorWidget child2(&child, Qt::Widget, Qt::white);
    child2.setGeometry(10, 10, 60, 60);

    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));

    if (QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation)) {
        // On some platforms (macOS), the palette will be different depending on if a
        // window is active or not. And because of that, the whole window will be
        // repainted when going from Inactive to Active. So wait for the window to be
        // active before we continue, so the activation doesn't happen at a random
        // time below. And call processEvents to have the paint events delivered right away.
        QVERIFY(QTest::qWaitForWindowActive(&w));
        qApp->processEvents();
    }

    QTRY_COMPARE(child2.r, QRegion(child2.rect()));
    child.r = QRegion();
    child2.r = QRegion();
    w.r = QRegion();

    child.hide();
    child2.hide();

    QTRY_COMPARE(w.r, QRegion(child.geometry()));

    child.show();
    QTRY_COMPARE(child.r, QRegion(child.rect()));
    QCOMPARE(child2.r, QRegion());
}

// This test doesn't make sense without support for showMinimized().
void tst_QWidget::updateWhileMinimized()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    if (m_platform == QStringLiteral("offscreen"))
        QSKIP("Platform offscreen does not support showMinimized()");

#if defined(Q_OS_QNX)
    QSKIP("Platform does not support showMinimized()");
#endif
    UpdateWidget widget;
    widget.setPalette(simplePalette());
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
   // Filter out activation change and focus events to avoid update() calls in QWidget.
    widget.updateOnActivationChangeAndFocusIn = false;
    widget.reset();
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QTRY_VERIFY(widget.numPaintEvents > 0);
    QTest::qWait(150);

    // Minimize window.
    widget.showMinimized();
    QTest::qWait(110);

    widget.reset();

    // The widget is not visible on the screen (but isVisible() still returns true).
    // Make sure update requests are discarded until the widget is shown again.
    widget.update(0, 0, 50, 50);
    QTest::qWait(10);
    int count = 0;
    // mutter/GNOME Shell doesn't unmap when minimizing window.
    // More details at https://gitlab.gnome.org/GNOME/mutter/issues/185
    if (m_platform == QStringLiteral("xcb")) {
        const QString desktop = qgetenv("XDG_CURRENT_DESKTOP");
        qDebug() << "xcb: XDG_CURRENT_DESKTOP=" << desktop;
        if (desktop == QStringLiteral("ubuntu:GNOME")
            || desktop == QStringLiteral("GNOME-Classic:GNOME")
            || desktop == QStringLiteral("GNOME")
            || desktop.isEmpty()) // on local VMs
            count = 1;
    }
    QCOMPARE(widget.numPaintEvents, count);

    // Restore window.
    widget.showNormal();
    QTRY_COMPARE(widget.numPaintEvents, 1);
    QCOMPARE(widget.paintedRegion, QRegion(0, 0, 50, 50));
}

class PaintOnScreenWidget: public QWidget
{
public:
    using QWidget::QWidget;
#if defined(Q_OS_WIN)
    // This is the only way to enable PaintOnScreen on Windows.
    QPaintEngine *paintEngine() const override { return nullptr; }
#endif
};

void tst_QWidget::alienWidgets()
{
    if (m_platform != QStringLiteral("xcb") && m_platform != QStringLiteral("windows"))
        QSKIP("This test is only for X11/Windows.");

    qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
    QWidget parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    parent.resize(m_testWidgetSize);
    QWidget child(&parent);
    QWidget grandChild(&child);
    QWidget greatGrandChild(&grandChild);
    parent.show();

    QVERIFY(QTest::qWaitForWindowExposed(&parent));

    // Verify that the WA_WState_Created attribute is set
    // and the top-level is the only native window.
    QVERIFY(parent.testAttribute(Qt::WA_WState_Created));
    QVERIFY(parent.internalWinId());

    QVERIFY(child.testAttribute(Qt::WA_WState_Created));
    QVERIFY(!child.internalWinId());

    QVERIFY(grandChild.testAttribute(Qt::WA_WState_Created));
    QVERIFY(!grandChild.internalWinId());

    QVERIFY(greatGrandChild.testAttribute(Qt::WA_WState_Created));
    QVERIFY(!greatGrandChild.internalWinId());

    // Enforce native windows all the way up in the parent hierarchy
    // if not WA_DontCreateNativeAncestors is set.
    grandChild.setAttribute(Qt::WA_DontCreateNativeAncestors);
    greatGrandChild.setAttribute(Qt::WA_NativeWindow);
    QVERIFY(greatGrandChild.internalWinId());
    QVERIFY(grandChild.internalWinId());
    QVERIFY(!child.internalWinId());

    {
        // Ensure that hide() on an ancestor of a widget with
        // Qt::WA_DontCreateNativeAncestors still gets unmapped
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(m_testWidgetSize);
        QWidget widget(&window);
        QWidget child(&widget);
        child.setAttribute(Qt::WA_NativeWindow);
        child.setAttribute(Qt::WA_DontCreateNativeAncestors);
        window.show();
        QVERIFY(QTest::qWaitForWindowExposed(&window));
        QTRY_VERIFY(child.testAttribute(Qt::WA_Mapped));
        widget.hide();
        QTRY_VERIFY(!child.testAttribute(Qt::WA_Mapped));
    }

    // Enforce a native window when calling QWidget::winId.
    QVERIFY(child.winId());
    QVERIFY(child.internalWinId());

    // Check that paint on screen widgets (incl. children) are native.
    PaintOnScreenWidget paintOnScreen(&parent);
    QWidget paintOnScreenChild(&paintOnScreen);
    paintOnScreen.show();
    QVERIFY(paintOnScreen.testAttribute(Qt::WA_WState_Created));
    QVERIFY(!paintOnScreen.testAttribute(Qt::WA_NativeWindow));
    QVERIFY(!paintOnScreen.internalWinId());
    QVERIFY(!paintOnScreenChild.testAttribute(Qt::WA_NativeWindow));
    QVERIFY(!paintOnScreenChild.internalWinId());

    paintOnScreen.setAttribute(Qt::WA_PaintOnScreen);
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
        QEXPECT_FAIL("", "QTBUG-26424", Continue);
    QVERIFY(paintOnScreen.testAttribute(Qt::WA_NativeWindow));
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
        QEXPECT_FAIL("", "QTBUG-26424", Continue);
    QVERIFY(paintOnScreen.internalWinId());
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
        QEXPECT_FAIL("", "QTBUG-26424", Continue);
    QVERIFY(paintOnScreenChild.testAttribute(Qt::WA_NativeWindow));
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
        QEXPECT_FAIL("", "QTBUG-26424", Continue);
    QVERIFY(paintOnScreenChild.internalWinId());

    // Check that widgets with the Qt::MSWindowsOwnDC attribute set
    // are native.
    QWidget msWindowsOwnDC(&parent, Qt::MSWindowsOwnDC);
    msWindowsOwnDC.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    msWindowsOwnDC.show();
    QVERIFY(msWindowsOwnDC.testAttribute(Qt::WA_WState_Created));
    QVERIFY(msWindowsOwnDC.testAttribute(Qt::WA_NativeWindow));
    QVERIFY(msWindowsOwnDC.internalWinId());

    { // Enforce a native window when calling QWidget::handle() (on X11) or QWidget::getDC() (on Windows).
        QWidget widget(&parent);
        widget.show();
        QVERIFY(widget.testAttribute(Qt::WA_WState_Created));
        QVERIFY(!widget.internalWinId());

        widget.winId();
        QVERIFY(widget.internalWinId());
    }

    if (m_platform == QStringLiteral("xcb")) {
        // Make sure we don't create native windows when setting Qt::WA_X11NetWmWindowType attributes
        // on alien widgets (see task 194231).
        QWidget dummy;
        dummy.resize(m_testWidgetSize);
        QVERIFY(dummy.winId());
        QWidget widget(&dummy);
        widget.setAttribute(Qt::WA_X11NetWmWindowTypeToolBar);
        QVERIFY(!widget.internalWinId());
    }

    { // Make sure we create native ancestors when setting Qt::WA_PaintOnScreen before show().
        QWidget topLevel;
        topLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        topLevel.resize(m_testWidgetSize);
        QWidget child(&topLevel);
        QWidget grandChild(&child);
        PaintOnScreenWidget greatGrandChild(&grandChild);

        greatGrandChild.setAttribute(Qt::WA_PaintOnScreen);
        QVERIFY(!child.internalWinId());
        QVERIFY(!grandChild.internalWinId());
        QVERIFY(!greatGrandChild.internalWinId());

        topLevel.show();
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(child.internalWinId());
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(grandChild.internalWinId());
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(greatGrandChild.internalWinId());
    }

    { // Ensure that widgets reparented into Qt::WA_PaintOnScreen widgets become native.
        QWidget topLevel;
        topLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        topLevel.resize(m_testWidgetSize);
        QWidget *widget = new PaintOnScreenWidget(&topLevel);
        widget->setAttribute(Qt::WA_PaintOnScreen);
        QWidget *child = new QWidget;
        QWidget *dummy = new QWidget(child);
        QWidget *grandChild = new QWidget(child);
        QWidget *dummy2 = new QWidget(grandChild);

        child->setParent(widget);

        QVERIFY(!topLevel.internalWinId());
        QVERIFY(!child->internalWinId());
        QVERIFY(!dummy->internalWinId());
        QVERIFY(!grandChild->internalWinId());
        QVERIFY(!dummy2->internalWinId());

        topLevel.show();
        QVERIFY(topLevel.internalWinId());
        QVERIFY(widget->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(child->internalWinId());
        QVERIFY(child->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(!child->testAttribute(Qt::WA_PaintOnScreen));
        QVERIFY(!dummy->internalWinId());
        QVERIFY(!dummy->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(!grandChild->internalWinId());
        QVERIFY(!grandChild->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(!dummy2->internalWinId());
        QVERIFY(!dummy2->testAttribute(Qt::WA_NativeWindow));
    }

    { // Ensure that ancestors of a Qt::WA_PaintOnScreen widget stay native
      // if they are re-created (typically in QWidgetPrivate::setParent_sys) (task 210822).
        QWidget window;
        window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        window.resize(m_testWidgetSize);
        QWidget child(&window);

        QWidget grandChild;
        grandChild.setWindowTitle("This causes the widget to be created");

        PaintOnScreenWidget paintOnScreenWidget;
        paintOnScreenWidget.setAttribute(Qt::WA_PaintOnScreen);
        paintOnScreenWidget.setParent(&grandChild);

        grandChild.setParent(&child);

        window.show();

        QVERIFY(window.internalWinId());
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(child.internalWinId());
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(child.testAttribute(Qt::WA_NativeWindow));
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(grandChild.internalWinId());
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(grandChild.testAttribute(Qt::WA_NativeWindow));
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(paintOnScreenWidget.internalWinId());
        if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
            QEXPECT_FAIL("", "QTBUG-26424", Continue);
        QVERIFY(paintOnScreenWidget.testAttribute(Qt::WA_NativeWindow));
    }

    { // Ensure that all siblings are native unless Qt::AA_DontCreateNativeWidgetSiblings is set.
        qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings, false);
        QWidget mainWindow;
        mainWindow.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        QWidget *toolBar = new QWidget(&mainWindow);
        QWidget *dockWidget = new QWidget(&mainWindow);
        QWidget *centralWidget = new QWidget(&mainWindow);
        centralWidget->setMinimumSize(m_testWidgetSize);

        QWidget *button = new QWidget(centralWidget);
        QWidget *mdiArea = new QWidget(centralWidget);

        QWidget *horizontalScroll = new QWidget(mdiArea);
        QWidget *verticalScroll = new QWidget(mdiArea);
        QWidget *viewport = new QWidget(mdiArea);

        viewport->setAttribute(Qt::WA_NativeWindow);
        mainWindow.show();

        // Ensure that the viewport and its siblings are native:
        QVERIFY(verticalScroll->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(verticalScroll->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(horizontalScroll->testAttribute(Qt::WA_NativeWindow));

        // Ensure that the mdi area and its siblings are native:
        QVERIFY(mdiArea->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(button->testAttribute(Qt::WA_NativeWindow));

        // Ensure that the central widget and its siblings are native:
        QVERIFY(centralWidget->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(dockWidget->testAttribute(Qt::WA_NativeWindow));
        QVERIFY(toolBar->testAttribute(Qt::WA_NativeWindow));
    }
}

using WidgetAttributes = QList<Qt::WidgetAttribute>;

void tst_QWidget::nativeWindowPosition_data()
{
    QTest::addColumn<WidgetAttributes>("attributes");

    QTest::newRow("non-native all the way")
        << WidgetAttributes{};
    QTest::newRow("native all the way")
        << WidgetAttributes{ Qt::WA_NativeWindow };
    QTest::newRow("native with non-native ancestor")
        << WidgetAttributes{ Qt::WA_NativeWindow, Qt::WA_DontCreateNativeAncestors };
}

void tst_QWidget::nativeWindowPosition()
{
    QWidget topLevel;
    QWidget child(&topLevel);
    child.move(5, 5);

    QWidget grandChild(&child);
    grandChild.move(10, 10);

    QFETCH(WidgetAttributes, attributes);
    for (auto attribute : attributes)
        grandChild.setAttribute(attribute);

    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));

    QCOMPARE(child.pos(), QPoint(5, 5));
    QCOMPARE(grandChild.pos(), QPoint(10, 10));
}

class ASWidget : public QWidget
{
public:
    ASWidget(QSize sizeHint, QSizePolicy sizePolicy, bool layout, bool hfwLayout, QWidget *parent = nullptr)
        : QWidget(parent), mySizeHint(sizeHint)
    {
        setObjectName(QStringLiteral("ASWidget"));
        setWindowTitle(objectName());
        setSizePolicy(sizePolicy);
        if (layout) {
            QSizePolicy sp = QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
            sp.setHeightForWidth(hfwLayout);

            QVBoxLayout *vbox = new QVBoxLayout;
            vbox->setContentsMargins(0, 0, 0, 0);
            vbox->addWidget(new ASWidget(sizeHint + QSize(30, 20), sp, false, false));
            setLayout(vbox);
        }
    }

    QSize sizeHint() const override
    {
        if (layout())
            return layout()->totalSizeHint();
        return mySizeHint;
    }
    int heightForWidth(int width) const override
    {
        return sizePolicy().hasHeightForWidth() ? width * 2 : -1;
    }

    QSize mySizeHint;
};

void tst_QWidget::adjustSize_data()
{
    const int MagicW = 200;
    const int MagicH = 100;

    QTest::addColumn<QSize>("sizeHint");
    QTest::addColumn<int>("hPolicy");
    QTest::addColumn<int>("vPolicy");
    QTest::addColumn<bool>("hfwSP");
    QTest::addColumn<bool>("layout");
    QTest::addColumn<bool>("hfwLayout");
    QTest::addColumn<bool>("haveParent");
    QTest::addColumn<QSize>("expectedSize");

    QTest::newRow("1") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << false << false << false << QSize(5, qMax(6, MagicH));
    QTest::newRow("2") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << true << false << false << false << QSize(5, qMax(10, MagicH));
    QTest::newRow("3") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << false << false << QSize(35, 26);
    QTest::newRow("4") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << true << false << QSize(35, 70);
    QTest::newRow("5") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << false << false << false << QSize(100000, 100000);
    QTest::newRow("6") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << true << false << false << false << QSize(100000, 100000);
    QTest::newRow("7") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << false << false << QSize(100000, 100000);
    QTest::newRow("8") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << true << false << QSize(100000, 100000);
    QTest::newRow("9") << QSize(5, 6) << int(QSizePolicy::Expanding) << int(QSizePolicy::Minimum)
        << true << false << false << false << QSize(qMax(5, MagicW), 10);

    QTest::newRow("1c") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << false << false << true << QSize(5, 6);
    QTest::newRow("2c") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << true << false << false << true << QSize(5, 6 /* or 10 would be OK too, since hfw contradicts sizeHint() */);
    QTest::newRow("3c") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << false << true << QSize(35, 26);
    QTest::newRow("4c") << QSize(5, 6) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << true << true << QSize(35, 70);
    QTest::newRow("5c") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << false << false << true << QSize(40001, 30001);
    QTest::newRow("6c") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << true << false << false << true << QSize(40001, 30001 /* or 80002 would be OK too, since hfw contradicts sizeHint() */);
    QTest::newRow("7c") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << false << true << QSize(40001 + 30, 30001 + 20);
    QTest::newRow("8c") << QSize(40001, 30001) << int(QSizePolicy::Minimum) << int(QSizePolicy::Expanding)
        << false << true << true << true << QSize(40001 + 30, 80002 + 60);
    QTest::newRow("9c") << QSize(5, 6) << int(QSizePolicy::Expanding) << int(QSizePolicy::Minimum)
        << true << false << false << true << QSize(5, 6);
}

void tst_QWidget::adjustSize()
{
    QFETCH(QSize, sizeHint);
    QFETCH(int, hPolicy);
    QFETCH(int, vPolicy);
    QFETCH(bool, hfwSP);
    QFETCH(bool, layout);
    QFETCH(bool, hfwLayout);
    QFETCH(bool, haveParent);
    QFETCH(QSize, expectedSize);

    QScopedPointer<QWidget> parent(new QWidget);

    QSizePolicy sp = QSizePolicy(QSizePolicy::Policy(hPolicy), QSizePolicy::Policy(vPolicy));
    sp.setHeightForWidth(hfwSP);

    QWidget *child = new ASWidget(sizeHint, sp, layout, hfwLayout, haveParent ? parent.data() : nullptr);
    child->resize(123, 456);
    child->adjustSize();
    if (expectedSize == QSize(100000, 100000)) {
        QVERIFY2(child->size().width() < sizeHint.width(),
                 msgComparisonFailed(child->size().width(), "<", sizeHint.width()));
        QVERIFY2(child->size().height() < sizeHint.height(),
                 msgComparisonFailed(child->size().height(), "<", sizeHint.height()));
    } else {
        QCOMPARE(child->size(), expectedSize);
    }
    if (!haveParent)
        delete child;
}

class TestLayout : public QVBoxLayout
{
    Q_OBJECT
public:
    using QVBoxLayout::QVBoxLayout;

    void invalidate() override
    {
        invalidated = true;
    }

    bool invalidated = false;
};

void tst_QWidget::updateGeometry_data()
{
    QTest::addColumn<QSize>("minSize");
    QTest::addColumn<bool>("shouldInvalidate");
    QTest::addColumn<QSize>("maxSize");
    QTest::addColumn<bool>("shouldInvalidate2");
    QTest::addColumn<QSizePolicy::Policy>("verticalSizePolicy");
    QTest::addColumn<bool>("shouldInvalidate3");
    QTest::addColumn<bool>("setVisible");
    QTest::addColumn<bool>("shouldInvalidate4");

    QTest::newRow("setMinimumSize")
        << QSize(100, 100) << true
        << QSize() << false
        << QSizePolicy::Preferred << false
        << true << false;
    QTest::newRow("setMaximumSize")
        << QSize() << false
        << QSize(100, 100) << true
        << QSizePolicy::Preferred << false
        << true << false;
    QTest::newRow("setMinimumSize, then maximumSize to a different size")
        << QSize(100, 100) << true
        << QSize(300, 300) << true
        << QSizePolicy::Preferred << false
        << true << false;
    QTest::newRow("setMinimumSize, then maximumSize to the same size")
        << QSize(100, 100) << true
        << QSize(100, 100) << true
        << QSizePolicy::Preferred << false
        << true << false;
    QTest::newRow("setMinimumSize, then maximumSize to the same size and then hide it")
        << QSize(100, 100) << true
        << QSize(100, 100) << true
        << QSizePolicy::Preferred << false
        << false << true;
    QTest::newRow("Change sizePolicy")
        << QSize() << false
        << QSize() << false
        << QSizePolicy::Minimum << true
        << true << false;

}

void tst_QWidget::updateGeometry()
{
    QFETCH(QSize, minSize);
    QFETCH(bool, shouldInvalidate);
    QFETCH(QSize, maxSize);
    QFETCH(bool, shouldInvalidate2);
    QFETCH(QSizePolicy::Policy, verticalSizePolicy);
    QFETCH(bool, shouldInvalidate3);
    QFETCH(bool, setVisible);
    QFETCH(bool, shouldInvalidate4);
    QWidget parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()) + QLatin1String("::")
                          + QLatin1String(QTest::currentDataTag()));
    parent.resize(200, 200);
    TestLayout *lout = new TestLayout();
    parent.setLayout(lout);
    QWidget *child = new QWidget(&parent);
    lout->addWidget(child);
    parent.show();
    QApplication::processEvents();

    lout->invalidated = false;
    if (minSize.isValid())
        child->setMinimumSize(minSize);
    QCOMPARE(lout->invalidated, shouldInvalidate);

    lout->invalidated = false;
    if (maxSize.isValid())
        child->setMaximumSize(maxSize);
    QCOMPARE(lout->invalidated, shouldInvalidate2);

    lout->invalidated = false;
    child->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, verticalSizePolicy));
    if (shouldInvalidate3)
        QCOMPARE(lout->invalidated, true);

    lout->invalidated = false;
    if (!setVisible)
        child->setVisible(false);
    QCOMPARE(lout->invalidated, shouldInvalidate4);
}

void tst_QWidget::sendUpdateRequestImmediately()
{
    UpdateWidget updateWidget;
    updateWidget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    updateWidget.show();

    QVERIFY(QTest::qWaitForWindowExposed(&updateWidget));

    QCoreApplication::processEvents();
    updateWidget.reset();

    QCOMPARE(updateWidget.numUpdateRequestEvents, 0);
    updateWidget.repaint();
    QCOMPARE(updateWidget.numUpdateRequestEvents, 1);
}

void tst_QWidget::doubleRepaint()
{
#ifdef Q_OS_MACOS
    QSKIP("QTBUG-52974");
#endif

#if defined(Q_OS_MACOS)
    if (!macHasAccessToWindowsServer())
        QSKIP("Not having window server access causes the wrong number of repaints to be issues");
#endif
   UpdateWidget widget;
   widget.setPalette(simplePalette());
   widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
   centerOnScreen(&widget);
   widget.setFocusPolicy(Qt::StrongFocus);
   // Filter out activation change and focus events to avoid update() calls in QWidget.
   widget.updateOnActivationChangeAndFocusIn = false;

   // Show: 1 repaint
   int expectedRepaints = 1;
   widget.show();
   QVERIFY(QTest::qWaitForWindowExposed(&widget));
   QTRY_COMPARE(widget.numPaintEvents, expectedRepaints);
   widget.numPaintEvents = 0;

   // Minmize: Should not trigger a repaint.
   widget.showMinimized();
   QTest::qWait(10);
   QCOMPARE(widget.numPaintEvents, 0);
   widget.numPaintEvents = 0;

   // Restore: Should not trigger a repaint.
   widget.showNormal();
   QVERIFY(QTest::qWaitForWindowExposed(&widget));
   QTest::qWait(10);
   QCOMPARE(widget.numPaintEvents, 0);
}

void tst_QWidget::resizeInPaintEvent()
{
    QWidget window;
    window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    UpdateWidget widget(&window);
    widget.setPalette(simplePalette());
    window.resize(200, 200);
    window.show();
    QApplicationPrivate::setActiveWindow(&window);
    QVERIFY(QTest::qWaitForWindowExposed(&window));
    QTRY_VERIFY(widget.numPaintEvents > 0);

    widget.reset();
    QCOMPARE(widget.numPaintEvents, 0);

    widget.resizeInPaintEvent = true;
    // This will call resize in the paintEvent, which in turn will call
    // invalidateBackingStore() and a new update request should be posted.
    // the resize triggers another update.
    widget.update();
    QTRY_COMPARE(widget.numPaintEvents, 2);
}

void tst_QWidget::opaqueChildren()
{
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.resize(200, 200);

    QWidget child(&widget);
    child.setGeometry(-700, -700, 200, 200);

    QWidget grandChild(&child);
    grandChild.resize(200, 200);

    QWidget greatGrandChild(&grandChild);
    greatGrandChild.setGeometry(50, 50, 200, 200);
    greatGrandChild.setPalette(Qt::red);
    greatGrandChild.setAutoFillBackground(true); // Opaque child widget.

    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));

    // Child, grandChild and greatGrandChild are outside the ancestor clip.
    QRegion expectedOpaqueRegion(50, 50, 150, 150);
    QCOMPARE(qt_widget_private(&grandChild)->getOpaqueChildren(), expectedOpaqueRegion);

    // Now they are all inside the ancestor clip.
    child.setGeometry(50, 50, 150, 150);
    QCOMPARE(qt_widget_private(&grandChild)->getOpaqueChildren(), expectedOpaqueRegion);

    // Set mask on greatGrandChild.
    const QRegion mask(10, 10, 50, 50);
    greatGrandChild.setMask(mask);
    expectedOpaqueRegion &= mask.translated(50, 50);
    QCOMPARE(qt_widget_private(&grandChild)->getOpaqueChildren(), expectedOpaqueRegion);

    // Make greatGrandChild "transparent".
    greatGrandChild.setAutoFillBackground(false);
    QCOMPARE(qt_widget_private(&grandChild)->getOpaqueChildren(), QRegion());
}

void tst_QWidget::dumpObjectTree()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("QWindow::requestActivate() is not supported.");

    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    Q_SET_OBJECT_NAME(w);
    w.move(100, 100);
    w.resize(200, 200);

    QLineEdit le(&w);
    Q_SET_OBJECT_NAME(le);
    le.resize(200, 200);

    {
        const char * const expected[] = {
            "QWidget::w I",
            "    QLineEdit::le I",
            "        QWidgetLineControl:: ",
        };
        for (const char *line : expected)
            QTest::ignoreMessage(QtDebugMsg, line);
        w.dumpObjectTree();
    }

    QTestPrivate::androidCompatibleShow(&w);
    QApplicationPrivate::setActiveWindow(&w);
    QVERIFY(QTest::qWaitForWindowActive(&w));

    {
        const char * const expected[] = {
            "QWidget::w <200x200+100+100>",
            "    QLineEdit::le F<200x200+0+0>",
            "        QWidgetLineControl:: ",
        };
        for (const char *line : expected)
            QTest::ignoreMessage(QtDebugMsg, line);
        w.dumpObjectTree();
    }
}

class MaskSetWidget : public QWidget
{
    Q_OBJECT
public:
    using QWidget::QWidget;

    void paintEvent(QPaintEvent *event) override
    {
        QPainter p(this);

        paintedRegion += event->region();
        for (const QRect &r : event->region())
            p.fillRect(r, Qt::red);

        repainted = true;
    }

    void resizeEvent(QResizeEvent *) override
    {
        setMask(QRegion(QRect(0, 0, width(), 10)));
    }

    QRegion paintedRegion;
    bool repainted = false;

public slots:
    void resizeDown() { setGeometry(QRect(0, 50, 50, 50)); }
    void resizeUp() { setGeometry(QRect(0, 50, 150, 50)); }
};

void tst_QWidget::setMaskInResizeEvent()
{
    UpdateWidget w;
    w.setPalette(simplePalette());
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.reset();
    w.resize(200, 200);
    centerOnScreen(&w);
    w.setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
    w.raise();

    MaskSetWidget testWidget(&w);
    testWidget.setGeometry(0, 0, 100, 100);
    testWidget.setMask(QRegion(QRect(0,0,100,10)));
    testWidget.show();
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    QTRY_VERIFY(w.numPaintEvents > 0);

    w.reset();
    testWidget.paintedRegion = QRegion();
    testWidget.resizeDown();

    QRegion expectedParentUpdate(0, 0, 100, 10); // Old testWidget area.
    expectedParentUpdate += testWidget.geometry(); // New testWidget area.
    QTRY_VERIFY(testWidget.repainted);
    QTRY_COMPARE(w.paintedRegion, expectedParentUpdate);
    QTRY_COMPARE(testWidget.paintedRegion, testWidget.mask());

    testWidget.paintedRegion = QRegion();
    testWidget.repainted = false;
    // Now resize the widget again, but in the opposite direction
    testWidget.resizeUp();
    QTRY_VERIFY(testWidget.repainted);
    QTRY_COMPARE(testWidget.paintedRegion, testWidget.mask());
}

class MoveInResizeWidget : public QWidget
{
    Q_OBJECT
public:
    explicit MoveInResizeWidget(QWidget *p = nullptr)
        : QWidget(p)
    {
        setWindowFlags(Qt::FramelessWindowHint);
    }

    void resizeEvent(QResizeEvent *) override
    {
        move(QPoint(100,100));

        static bool firstTime = true;
        if (firstTime)
            QTimer::singleShot(250, this, &MoveInResizeWidget::resizeMe);

        firstTime = false;
    }

public slots:
    void resizeMe() {
        resize(100, 100);
    }
};

void tst_QWidget::moveInResizeEvent()
{
    MoveInResizeWidget testWidget;
    testWidget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    testWidget.setGeometry(50, 50, 200, 200);
    testWidget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&testWidget));

    QRect expectedGeometry(100,100, 100, 100);
    QTRY_COMPARE(testWidget.geometry(), expectedGeometry);
}

#ifdef QT_BUILD_INTERNAL
void tst_QWidget::immediateRepaintAfterInvalidateBackingStore()
{
    if (m_platform != QStringLiteral("xcb") && m_platform != QStringLiteral("windows"))
        QSKIP("We don't support immediate repaint right after show on other platforms.");

    QScopedPointer<UpdateWidget> widget(new UpdateWidget);
    widget->setPalette(simplePalette());
    widget->setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    centerOnScreen(widget.data());
    widget->show();
    QVERIFY(QTest::qWaitForWindowExposed(widget.data()));

    widget->numPaintEvents = 0;

    // Marks the area covered by the widget as dirty in the backing store and
    // posts an UpdateRequest event.
    qt_widget_private(widget.data())->invalidateBackingStore(widget->rect());
    QCOMPARE(widget->numPaintEvents, 0);

    // The entire widget is already dirty, but this time we want to update immediately
    // by calling repaint(), and thus we have to repaint the widget and not wait for
    // the UpdateRequest to be sent when we get back to the event loop.
    widget->update();
    QTRY_COMPARE(widget->numPaintEvents, 1);
}
#endif

void tst_QWidget::effectiveWinId()
{
    QWidget parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    parent.resize(200, 200);
    QWidget child(&parent);

    // Shouldn't crash.
    QVERIFY(!parent.effectiveWinId());
    QVERIFY(!child.effectiveWinId());

    parent.show();

    QVERIFY(parent.effectiveWinId());
    QVERIFY(child.effectiveWinId());
}

void tst_QWidget::effectiveWinId2()
{
    QWidget parent;

    class MyWidget : public QWidget
    {
        bool event(QEvent *e) override
        {
            if (e->type() == QEvent::WinIdChange) {
                // Shouldn't crash.
                effectiveWinId();
            }

            return QWidget::event(e);
        }
    };

    MyWidget child;
    child.setParent(&parent);
    parent.show();

    child.setParent(nullptr);
    child.setParent(&parent);
}

class CustomWidget : public QWidget
{
public:
    mutable int metricCallCount = 0;

    using QWidget::QWidget;

    int metric(PaintDeviceMetric metric) const override
    {
        ++metricCallCount;
        return QWidget::metric(metric);
    }
};

void tst_QWidget::customDpi()
{
    QScopedPointer<QWidget> topLevel(new QWidget);
    CustomWidget *custom = new CustomWidget(topLevel.data());
    QWidget *child = new QWidget(custom);

    custom->metricCallCount = 0;
    topLevel->logicalDpiX();
    QCOMPARE(custom->metricCallCount, 0);
    custom->logicalDpiX();
    QCOMPARE(custom->metricCallCount, 1);
    child->logicalDpiX();
    QCOMPARE(custom->metricCallCount, 1);
}

void tst_QWidget::customDpiProperty()
{
    QScopedPointer<QWidget> topLevel(new QWidget);
    QWidget *middle = new CustomWidget(topLevel.data());
    QWidget *child = new QWidget(middle);

    const int initialDpiX = topLevel->logicalDpiX();
    const int initialDpiY = topLevel->logicalDpiY();

    middle->setProperty("_q_customDpiX", 300);
    middle->setProperty("_q_customDpiY", 400);

    QCOMPARE(topLevel->logicalDpiX(), initialDpiX);
    QCOMPARE(topLevel->logicalDpiY(), initialDpiY);

    QCOMPARE(middle->logicalDpiX(), 300);
    QCOMPARE(middle->logicalDpiY(), 400);

    QCOMPARE(child->logicalDpiX(), 300);
    QCOMPARE(child->logicalDpiY(), 400);

    middle->setProperty("_q_customDpiX", QVariant());
    middle->setProperty("_q_customDpiY", QVariant());

    QCOMPARE(topLevel->logicalDpiX(), initialDpiX);
    QCOMPARE(topLevel->logicalDpiY(), initialDpiY);

    QCOMPARE(middle->logicalDpiX(), initialDpiX);
    QCOMPARE(middle->logicalDpiY(), initialDpiY);

    QCOMPARE(child->logicalDpiX(), initialDpiX);
    QCOMPARE(child->logicalDpiY(), initialDpiY);
}

void tst_QWidget::quitOnCloseAttribute()
{
    QWidget w;
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), true);
    w.setAttribute(Qt::WA_QuitOnClose, false);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);

    w.setAttribute(Qt::WA_QuitOnClose);
    w.setWindowFlags(Qt::Tool);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);

    w.setAttribute(Qt::WA_QuitOnClose);
    w.setWindowFlags(Qt::Popup);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);

    w.setAttribute(Qt::WA_QuitOnClose);
    w.setWindowFlags(Qt::ToolTip);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);

    w.setAttribute(Qt::WA_QuitOnClose);
    w.setWindowFlags(Qt::SplashScreen);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);

    w.setAttribute(Qt::WA_QuitOnClose);
    w.setWindowFlags(Qt::SubWindow);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);

    w.setAttribute(Qt::WA_QuitOnClose);
    w.setWindowFlags(Qt::Dialog);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), true);
    w.show();
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), true);
    w.setWindowFlags(Qt::Tool);
    QCOMPARE(w.testAttribute(Qt::WA_QuitOnClose), false);
}

void tst_QWidget::moveRect()
{
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.resize(200, 200);
    widget.setUpdatesEnabled(false);
    QWidget child(&widget);
    child.setUpdatesEnabled(false);
    child.setAttribute(Qt::WA_OpaquePaintEvent);
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    child.move(10, 10); // Don't crash.
}

#if defined(Q_OS_WIN)
class GDIWidget : public QDialog
{
    Q_OBJECT
public:
    GDIWidget() {
        setAttribute(Qt::WA_PaintOnScreen);
        timer.setSingleShot(true);
        timer.setInterval(0);
    }
    QPaintEngine *paintEngine() const override { return nullptr; }

    void paintEvent(QPaintEvent *) override
    {
        QPlatformNativeInterface *ni = QGuiApplication::platformNativeInterface();
        const auto hdc = reinterpret_cast<HDC>(ni->nativeResourceForWindow(QByteArrayLiteral("getDC"), windowHandle()));
        if (hdc) {
            const HBRUSH brush = CreateSolidBrush(RGB(255, 0, 0));
            SelectObject(hdc, brush);
            Rectangle(hdc, 0, 0, 10, 10);
            DeleteObject(brush);
            ni->nativeResourceForWindow(QByteArrayLiteral("releaseDC"), windowHandle());
        } else {
            qWarning("%s: Unable to obtain native DC.", Q_FUNC_INFO);
        }
        if (!timer.isActive()) {
            connect(&timer, &QTimer::timeout, this,
                    hdc ? &GDIWidget::slotTimer : &QDialog::reject);
            timer.start();
        }
    }

    QSize sizeHint() const override { return {400, 300}; };

private slots:
    void slotTimer() {
        QScreen *screen = windowHandle()->screen();
        const QImage im = screen->grabWindow(internalWinId(), 0, 0, -1, -1).toImage();
        color = im.pixel(1, 1);
        accept();
    }

public:
    QColor color;
    QTimer timer;
};

void tst_QWidget::gdiPainting()
{
    GDIWidget w;
    w.exec();

    QCOMPARE(w.color, QColor(255, 0, 0));

}

void tst_QWidget::paintOnScreenPossible()
{
    QWidget w1;
    w1.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w1.setAttribute(Qt::WA_PaintOnScreen);
    QVERIFY(!w1.testAttribute(Qt::WA_PaintOnScreen));

    GDIWidget w2;
    w2.setAttribute(Qt::WA_PaintOnScreen);
    QVERIFY(w2.testAttribute(Qt::WA_PaintOnScreen));
}
#endif // Q_OS_WIN

void tst_QWidget::reparentStaticWidget()
{
    QWidget window1;
    window1.setWindowTitle(QStringLiteral("window1 ") + __FUNCTION__);
    window1.resize(m_testWidgetSize);
    window1.move(m_availableTopLeft + QPoint(100, 100));

    QWidget *child = new QWidget(&window1);
    child->setPalette(Qt::red);
    child->setAutoFillBackground(true);
    child->setAttribute(Qt::WA_StaticContents);
    child->resize(window1.width() - 40,  window1.height() - 40);
    child->setWindowTitle(QStringLiteral("child ") + __FUNCTION__);

    QWidget *grandChild = new QWidget(child);
    grandChild->setPalette(Qt::blue);
    grandChild->setAutoFillBackground(true);
    grandChild->resize(50, 50);
    grandChild->setAttribute(Qt::WA_StaticContents);
    window1.show();
    QVERIFY(QTest::qWaitForWindowExposed(&window1));

    QWidget window2;
    window2.setWindowTitle(QStringLiteral("window2 ") + __FUNCTION__);
    window2.resize(m_testWidgetSize);
    window2.move(window1.geometry().topRight() + QPoint(100, 0));
    window2.show();
    QVERIFY(QTest::qWaitForWindowExposed(&window2));

    // Reparent into another top-level.
    child->setParent(&window2);
    child->show();

    // Please don't crash.
    window1.resize(window1.size() + QSize(2, 2));
    QTest::qWait(20);

    // Make sure we move all static children even though
    // the reparented widget itself is non-static.
    child->setAttribute(Qt::WA_StaticContents, false);
    child->setParent(&window1);
    child->show();

    // Please don't crash.
    window2.resize(window2.size() + QSize(2, 2));
    QTest::qWait(20);

    child->setParent(nullptr);
    child->show();
    QTest::qWait(20);

    // Please don't crash.
    child->resize(child->size() + QSize(2, 2));
    window2.resize(window2.size() + QSize(2, 2));
    QTest::qWait(20);

    QWidget *siblingOfGrandChild = new QWidget(child);
    siblingOfGrandChild->show();
    QTest::qWait(20);

    // Nothing should happen when reparenting within the same top-level.
    grandChild->setParent(siblingOfGrandChild);
    grandChild->show();
    QTest::qWait(20);

    QWidget paintOnScreen;
    paintOnScreen.setWindowTitle(QStringLiteral("paintOnScreen ") + __FUNCTION__);
    paintOnScreen.resize(m_testWidgetSize);
    paintOnScreen.move(window1.geometry().bottomLeft() + QPoint(0, 50));

    paintOnScreen.setAttribute(Qt::WA_PaintOnScreen);
    paintOnScreen.show();
    QVERIFY(QTest::qWaitForWindowExposed(&paintOnScreen));
    QTest::qWait(20);

    child->setParent(&paintOnScreen);
    child->show();
    QTest::qWait(20);

    // Please don't crash.
    paintOnScreen.resize(paintOnScreen.size() + QSize(2, 2));
    QTest::qWait(20);

}

void tst_QWidget::QTBUG6883_reparentStaticWidget2()
{
    QMainWindow mw;
    mw.setWindowTitle(QStringLiteral("MainWindow ") + __FUNCTION__);
    mw.move(m_availableTopLeft + QPoint(100, 100));

    QDockWidget *one = new QDockWidget(QStringLiteral("Dock ") + __FUNCTION__, &mw);
    mw.addDockWidget(Qt::LeftDockWidgetArea, one , Qt::Vertical);

    QWidget *child = new QWidget();
    child->setPalette(Qt::red);
    child->setAutoFillBackground(true);
    child->setAttribute(Qt::WA_StaticContents);
    child->resize(m_testWidgetSize);
    one->setWidget(child);

    QToolBar *mainTools = mw.addToolBar("Main Tools");
    QLineEdit *le = new QLineEdit;
    le->setMinimumWidth(m_testWidgetSize.width());
    mainTools->addWidget(le);

    mw.show();
    QVERIFY(QTest::qWaitForWindowExposed(&mw));

    one->setFloating(true);
    QTest::qWait(20);
    //do not crash
}

class ColorRedWidget : public QWidget
{
public:
    explicit ColorRedWidget(QWidget *parent = nullptr)
        : QWidget(parent, Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::ToolTip)
    {
    }

    void paintEvent(QPaintEvent *) override
    {
        QPainter p(this);
        p.fillRect(rect(),Qt::red);
    }
};

void tst_QWidget::translucentWidget()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QPixmap pm(16,16);
    pm.fill(Qt::red);
    ColorRedWidget label;
    label.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    label.setFixedSize(16,16);
    label.setAttribute(Qt::WA_TranslucentBackground);
    label.move(m_availableTopLeft);
    label.show();
    QVERIFY(QTest::qWaitForWindowExposed(&label));

    QPixmap widgetSnapshot =
        label.grab(QRect(QPoint(0, 0), label.size()));
    const QImage actual = widgetSnapshot.toImage().convertToFormat(QImage::Format_RGB32);
    QImage expected = pm.toImage().scaled(label.devicePixelRatio() * pm.size());
    expected.setDevicePixelRatio(label.devicePixelRatio());
#ifdef Q_OS_ANDROID
    // Android uses Format_ARGB32_Premultiplied by default
    expected = expected.convertToFormat(QImage::Format_RGB32);
#endif
    QCOMPARE(actual.size(),expected.size());
    QCOMPARE(actual,expected);

    const QWindow *window = label.windowHandle();
    const QSurfaceFormat translucentFormat = window->format();
    label.setAttribute(Qt::WA_TranslucentBackground, false);
    // Changing WA_TranslucentBackground with an already created native window
    // has no effect since Qt 5.0 due to the introduction of QWindow et al.
    // This means that the change must *not* be reflected in the
    // QSurfaceFormat, because there is no change when it comes to the
    // underlying native window. Otherwise the state would no longer
    // describe reality (the native window) See QTBUG-85714.
    QVERIFY(translucentFormat == window->format());
}

class MaskResizeTestWidget : public QWidget
{
    Q_OBJECT
public:
    explicit MaskResizeTestWidget(QWidget* p = nullptr) : QWidget(p)
    {
        setMask(QRegion(QRect(0, 0, 100, 100)));
    }

    void paintEvent(QPaintEvent* event) override
    {
        QPainter p(this);

        paintedRegion += event->region();
        for (const QRect &r : event->region())
            p.fillRect(r, Qt::red);
    }

    QRegion paintedRegion;

public slots:
    void enlargeMask() {
        QRegion newMask(QRect(0, 0, 150, 150));
        setMask(newMask);
    }

    void shrinkMask() {
        QRegion newMask(QRect(0, 0, 50, 50));
        setMask(newMask);
    }

};

void tst_QWidget::setClearAndResizeMask()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    UpdateWidget topLevel;
    topLevel.setPalette(simplePalette());
    topLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    topLevel.resize(160, 160);
    centerOnScreen(&topLevel);
    topLevel.show();
    QApplicationPrivate::setActiveWindow(&topLevel);
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QTRY_VERIFY(topLevel.numPaintEvents > 0);
    topLevel.reset();

    // Mask top-level widget
    const QRegion topLevelMask(0, 0, 100, 100, QRegion::Ellipse);
    topLevel.setMask(topLevelMask);
    QCOMPARE(topLevel.mask(), topLevelMask);
    // Ensure that the top-level doesn't get any update.
    // We don't control what's happening on platforms other than X11, Windows
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows"))
        QCOMPARE(topLevel.numPaintEvents, 0);

    topLevel.reset();

    // Clear top-level mask
    topLevel.clearMask();
    QCOMPARE(topLevel.mask(), QRegion());
    QTest::qWait(10);
    QRegion outsideOldMask(topLevel.rect());
    outsideOldMask -= topLevelMask;
    // Ensure that the top-level gets an update for the area outside the old mask.
    // We don't control what's happening on platforms other than X11, Windows
    if (m_platform == QStringLiteral("xcb") || m_platform == QStringLiteral("windows")) {
        QTRY_VERIFY(topLevel.numPaintEvents > 0);
        QTRY_COMPARE(topLevel.paintedRegion, outsideOldMask);
    }

    UpdateWidget child(&topLevel);
    child.setPalette(simplePalette());
    child.setAutoFillBackground(true); // NB! Opaque child.
    child.setPalette(Qt::red);
    child.resize(100, 100);
    child.show();
    QTest::qWait(10);

    child.reset();
    topLevel.reset();

    // Mask child widget with a mask that is smaller than the rect
    const QRegion childMask(0, 0, 50, 50);
    child.setMask(childMask);
    QTRY_COMPARE(child.mask(), childMask);
    // and ensure that the child widget doesn't get any update.
#ifdef Q_OS_MACOS
    // Mac always issues a full update when calling setMask, and we cannot force it to not do so.
    if (child.internalWinId())
        QCOMPARE(child.numPaintEvents, 1);
    else
#endif
    QCOMPARE(child.numPaintEvents, 0);
    // and the parent widget gets an update for the newly exposed area.
    QTRY_COMPARE(topLevel.numPaintEvents, 1);
    QRegion expectedParentExpose(child.rect());
    expectedParentExpose -= childMask;
    QCOMPARE(topLevel.paintedRegion, expectedParentExpose);

    child.reset();
    topLevel.reset();

    // Clear child widget mask
    child.clearMask();
    QTRY_COMPARE(child.mask(), QRegion());
    // and ensure that that the child widget gets an update for the area outside the old mask.
    QTRY_COMPARE(child.numPaintEvents, 1);
    outsideOldMask = child.rect();
#ifdef Q_OS_MACOS
    // Mac always issues a full update when calling setMask, and we cannot force it to not do so.
    if (!child.internalWinId())
#endif
    outsideOldMask -= childMask;
    QCOMPARE(child.paintedRegion, outsideOldMask);
    // and the parent widget doesn't get any update.
    QCOMPARE(topLevel.numPaintEvents, 0);

    child.reset();
    topLevel.reset();

    // Mask child widget with a mask that is bigger than the rect
    child.setMask(QRegion(0, 0, 1000, 1000));
#ifdef Q_OS_MACOS
    // Mac always issues a full update when calling setMask, and we cannot force it to not do so.
    if (child.internalWinId())
        QTRY_COMPARE(child.numPaintEvents, 1);
    else
#endif
    // and ensure that we don't get any updates at all.
    QTRY_COMPARE(child.numPaintEvents, 0);
    QCOMPARE(topLevel.numPaintEvents, 0);

    // ...and the same applies when clearing the mask.
    child.clearMask();
    QTest::qWait(100);
#ifdef Q_OS_MACOS
    // Mac always issues a full update when calling setMask, and we cannot force it to not do so.
    if (child.internalWinId())
        QTRY_VERIFY(child.numPaintEvents > 0);
    else
#endif
    QCOMPARE(child.numPaintEvents, 0);
    QCOMPARE(topLevel.numPaintEvents, 0);

    QWidget resizeParent;
    MaskResizeTestWidget resizeChild(&resizeParent);

    resizeParent.resize(300,300);
    resizeParent.raise();
    resizeParent.setWindowFlags(Qt::WindowStaysOnTopHint);
    resizeChild.setGeometry(50,50,200,200);
    QPalette pal = resizeParent.palette();
    pal.setColor(QPalette::Window, QColor(Qt::white));
    resizeParent.setPalette(pal);

    resizeParent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&resizeParent));
    // Disable the size grip on the Mac; otherwise it'll be included when grabbing the window.
    resizeParent.setFixedSize(resizeParent.size());
    resizeChild.show();
    QTest::qWait(100);
    resizeChild.paintedRegion = QRegion();

    QTimer::singleShot(100, &resizeChild, SLOT(shrinkMask()));
    QTest::qWait(200);
#ifdef Q_OS_MACOS
    // Mac always issues a full update when calling setMask, and we cannot force it to not do so.
    if (child.internalWinId())
        QTRY_COMPARE(resizeChild.paintedRegion, resizeChild.mask());
    else
#endif
    QTRY_COMPARE(resizeChild.paintedRegion, QRegion());

    resizeChild.paintedRegion = QRegion();
    const QRegion oldMask = resizeChild.mask();
    QTimer::singleShot(0, &resizeChild, SLOT(enlargeMask()));
    QTest::qWait(100);
#ifdef Q_OS_MACOS
    // Mac always issues a full update when calling setMask, and we cannot force it to not do so.
    if (child.internalWinId())
        QTRY_COMPARE(resizeChild.paintedRegion, resizeChild.mask());
    else
#endif
    QTRY_COMPARE(resizeChild.paintedRegion, resizeChild.mask() - oldMask);
}

void tst_QWidget::maskedUpdate()
{
    UpdateWidget topLevel;
    topLevel.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    topLevel.resize(200, 200);
    centerOnScreen(&topLevel);
    const QRegion topLevelMask(50, 50, 70, 70);
    topLevel.setMask(topLevelMask);

    UpdateWidget child(&topLevel);
    child.setGeometry(20, 20, 180, 180);
    const QRegion childMask(60, 60, 30, 30);
    child.setMask(childMask);

    UpdateWidget grandChild(&child);
    grandChild.setGeometry(50, 50, 100, 100);
    const QRegion grandChildMask(20, 20, 10, 10);
    grandChild.setMask(grandChildMask);

    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QTRY_VERIFY(topLevel.numPaintEvents > 0);


#define RESET_WIDGETS \
    topLevel.reset(); \
    child.reset(); \
    grandChild.reset();

#define CLEAR_MASK(widget) \
    widget.clearMask(); \
    QTest::qWait(100); \
    RESET_WIDGETS;

    // All widgets are transparent at this point, so any call to update() will result
    // in composition, i.e. the update propagates to ancestors and children.

    // TopLevel update.
    RESET_WIDGETS;
    topLevel.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, topLevelMask);
    QTRY_COMPARE(child.paintedRegion, childMask);
    QTRY_COMPARE(grandChild.paintedRegion, grandChildMask);

    // Child update.
    RESET_WIDGETS;
    child.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, childMask.translated(child.pos()));
    QTRY_COMPARE(child.paintedRegion, childMask);
    QTRY_COMPARE(grandChild.paintedRegion, grandChildMask);

    // GrandChild update.
    RESET_WIDGETS;
    grandChild.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, grandChildMask.translated(grandChild.mapTo(&topLevel, QPoint())));
    QTRY_COMPARE(child.paintedRegion, grandChildMask.translated(grandChild.pos()));
    QTRY_COMPARE(grandChild.paintedRegion, grandChildMask);

    topLevel.setAttribute(Qt::WA_OpaquePaintEvent);
    child.setAttribute(Qt::WA_OpaquePaintEvent);
    grandChild.setAttribute(Qt::WA_OpaquePaintEvent);

    // All widgets are now opaque, which means no composition, i.e.
    // the update does not propate to ancestors and children.

    // TopLevel update.
    RESET_WIDGETS;
    topLevel.update();
    QTest::qWait(10);

    QRegion expectedTopLevelUpdate = topLevelMask;
    expectedTopLevelUpdate -= childMask.translated(child.pos()); // Subtract opaque children.
    QTRY_COMPARE(topLevel.paintedRegion, expectedTopLevelUpdate);
    QTRY_COMPARE(child.paintedRegion, QRegion());
    QTRY_COMPARE(grandChild.paintedRegion, QRegion());

    // Child update.
    RESET_WIDGETS;
    child.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, QRegion());
    QRegion expectedChildUpdate = childMask;
    expectedChildUpdate -= grandChildMask.translated(grandChild.pos()); // Subtract oapque children.
    QTRY_COMPARE(child.paintedRegion, expectedChildUpdate);
    QTRY_COMPARE(grandChild.paintedRegion, QRegion());

    // GrandChild update.
    RESET_WIDGETS;
    grandChild.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, QRegion());
    QTRY_COMPARE(child.paintedRegion, QRegion());
    QTRY_COMPARE(grandChild.paintedRegion, grandChildMask);

    // GrandChild update.
    CLEAR_MASK(grandChild);
    grandChild.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, QRegion());
    QTRY_COMPARE(child.paintedRegion, QRegion());
    QRegion expectedGrandChildUpdate = grandChild.rect();
    // Clip with parent's mask.
    expectedGrandChildUpdate &= childMask.translated(-grandChild.pos());
    QCOMPARE(grandChild.paintedRegion, expectedGrandChildUpdate);

    // GrandChild update.
    CLEAR_MASK(child);
    grandChild.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, QRegion());
    QTRY_COMPARE(child.paintedRegion, QRegion());
    expectedGrandChildUpdate = grandChild.rect();
    // Clip with parent's mask.
    expectedGrandChildUpdate &= topLevelMask.translated(-grandChild.mapTo(&topLevel, QPoint()));
    QTRY_COMPARE(grandChild.paintedRegion, expectedGrandChildUpdate);

    // Child update.
    RESET_WIDGETS;
    child.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, QRegion());
    expectedChildUpdate = child.rect();
    // Clip with parent's mask.
    expectedChildUpdate &= topLevelMask.translated(-child.pos());
    expectedChildUpdate -= grandChild.geometry(); // Subtract opaque children.
    QTRY_COMPARE(child.paintedRegion, expectedChildUpdate);
    QTRY_COMPARE(grandChild.paintedRegion, QRegion());

    // GrandChild update.
    CLEAR_MASK(topLevel);
    grandChild.update();
    QTest::qWait(10);

    QTRY_COMPARE(topLevel.paintedRegion, QRegion());
    QTRY_COMPARE(child.paintedRegion, QRegion());
    QTRY_COMPARE(grandChild.paintedRegion, QRegion(grandChild.rect())); // Full update.
}

#ifndef QT_NO_CURSOR
void tst_QWidget::syntheticEnterLeave()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: This fails. Figure out why.");
    class MyWidget : public QWidget
    {
    public:
        using QWidget::QWidget;
        void enterEvent(QEnterEvent *) override { ++numEnterEvents; }
        void leaveEvent(QEvent *) override { ++numLeaveEvents; }
        int numEnterEvents = 0;
        int numLeaveEvents = 0;
    };

    QCursor::setPos(m_safeCursorPos);
    if (!QTest::qWaitFor([this]{ return QCursor::pos() == m_safeCursorPos; }))
        QSKIP("Can't move cursor");

    MyWidget window;
    window.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    window.setWindowFlags(Qt::WindowStaysOnTopHint);
    window.move(200, 200);
    window.resize(200, 200);

    MyWidget *child1 = new MyWidget(&window);
    child1->setPalette(Qt::blue);
    child1->setAutoFillBackground(true);
    child1->resize(200, 200);
    child1->setCursor(Qt::OpenHandCursor);

    MyWidget *child2 = new MyWidget(&window);
    child2->resize(200, 200);

    MyWidget *grandChild = new MyWidget(child2);
    grandChild->setPalette(Qt::red);
    grandChild->setAutoFillBackground(true);
    grandChild->resize(200, 200);
    grandChild->setCursor(Qt::WaitCursor);

    window.show();
    window.raise();

    QVERIFY(QTest::qWaitForWindowExposed(&window));

#define RESET_EVENT_COUNTS \
    window.numEnterEvents = 0; \
    window.numLeaveEvents = 0; \
    child1->numEnterEvents = 0; \
    child1->numLeaveEvents = 0; \
    child2->numEnterEvents = 0; \
    child2->numLeaveEvents = 0; \
    grandChild->numEnterEvents = 0; \
    grandChild->numLeaveEvents = 0;

    // Position the cursor in the middle of the window.
    const QPoint globalPos = window.mapToGlobal(QPoint(100, 100));
    QCursor::setPos(globalPos); // Enter child2 and grandChild.
    if (!QTest::qWaitFor([globalPos]{ return QCursor::pos() == globalPos; }))
        QSKIP("Can't move cursor");

    QCOMPARE(window.numLeaveEvents, 0);
    QCOMPARE(child2->numLeaveEvents, 0);
    QCOMPARE(grandChild->numLeaveEvents, 0);
    QCOMPARE(child1->numLeaveEvents, 0);

    // This event arrives asynchronously
    QTRY_COMPARE(window.numEnterEvents, 1);
    QCOMPARE(child2->numEnterEvents, 1);
    QCOMPARE(grandChild->numEnterEvents, 1);
    QCOMPARE(child1->numEnterEvents, 0);

    RESET_EVENT_COUNTS;
    child2->hide(); // Leave child2 and grandChild, enter child1.

    QCOMPARE(window.numLeaveEvents, 0);
    QCOMPARE(child2->numLeaveEvents, 1);
    QCOMPARE(grandChild->numLeaveEvents, 1);
    QCOMPARE(child1->numLeaveEvents, 0);

    QCOMPARE(window.numEnterEvents, 0);
    QCOMPARE(child2->numEnterEvents, 0);
    QCOMPARE(grandChild->numEnterEvents, 0);
    QCOMPARE(child1->numEnterEvents, 1);

    RESET_EVENT_COUNTS;
    child2->show(); // Leave child1, enter child2 and grandChild.

    QCOMPARE(window.numLeaveEvents, 0);
    QCOMPARE(child2->numLeaveEvents, 0);
    QCOMPARE(grandChild->numLeaveEvents, 0);
    QCOMPARE(child1->numLeaveEvents, 1);

    QCOMPARE(window.numEnterEvents, 0);
    QCOMPARE(child2->numEnterEvents, 1);
    QCOMPARE(grandChild->numEnterEvents, 1);
    QCOMPARE(child1->numEnterEvents, 0);

    RESET_EVENT_COUNTS;
    delete child2; // Enter child1 (and do not send leave events to child2 and grandChild).

    QCOMPARE(window.numLeaveEvents, 0);
    QCOMPARE(child1->numLeaveEvents, 0);

    QCOMPARE(window.numEnterEvents, 0);
    QCOMPARE(child1->numEnterEvents, 1);
}
#endif

#ifndef QT_NO_CURSOR
void tst_QWidget::enterLeaveOnWindowShowHide_data()
{
    QTest::addColumn<Qt::WindowType>("windowType");
    QTest::addRow("dialog") << Qt::Dialog;
    QTest::addRow("popup") << Qt::Popup;
}


/*!
    Verify that a window that has the mouse gets a leave event
    when a dialog or popup opens (even if that dialog or popup is
    not under the mouse), and an enter event when the secondary window
    closes again (while the mouse is still over the original widget.

    Since mouse grabbing might cause some event interaction, simulate
    the opening of the secondary window from a mouse press, like we would with
    a button or context menu. See QTBUG-78970.
*/
void tst_QWidget::enterLeaveOnWindowShowHide()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("QWindow::requestActivate() is not supported.");

    QFETCH(Qt::WindowType, windowType);
    class Widget : public QWidget
    {
    public:
        int numEnterEvents = 0;
        int numLeaveEvents = 0;
        QPoint enterPosition;
        Qt::WindowType secondaryWindowType = {};
    protected:
        void enterEvent(QEnterEvent *e) override
        {
            enterPosition = e->position().toPoint();
            ++numEnterEvents;
        }
        void leaveEvent(QEvent *) override
        {
            enterPosition = {};
            ++numLeaveEvents;
        }
        void mousePressEvent(QMouseEvent *e) override
        {
            QWidget *secondary = nullptr;
            switch (secondaryWindowType) {
            case Qt::Dialog: {
                QDialog *dialog = new QDialog(this);
                dialog->setModal(true);
                dialog->setWindowModality(Qt::ApplicationModal);
                secondary = dialog;
                break;
            }
            case Qt::Popup: {
                QMenu *menu = new QMenu(this);
                menu->addAction("Action 1");
                menu->addAction("Action 2");
                secondary = menu;
                break;
            }
            default:
                QVERIFY2(false, "Test case not implemented for window type");
                break;
            }

            QPoint secondaryPos = e->globalPosition().toPoint();
            if (e->button() == Qt::LeftButton)
                secondaryPos += QPoint(10, 10); // cursor outside secondary
            else
                secondaryPos -= QPoint(10, 10); // cursor inside secondary
            secondary->move(secondaryPos);
            secondary->show();
            if (!QTest::qWaitForWindowExposed(secondary))
                QEXPECT_FAIL("", "Secondary window failed to show, test will fail", Abort);
            if (secondaryWindowType == Qt::Dialog && QGuiApplication::platformName() == "windows")
                QTest::qWait(1000); // on Windows, we have to wait for fade-in effects
        }
    };

    int expectedEnter = 0;
    int expectedLeave = 0;

    Widget widget;
    widget.secondaryWindowType = windowType;
    const QRect screenGeometry = widget.screen()->availableGeometry();
    const QPoint cursorPos = screenGeometry.topLeft() + QPoint(50, 50);
    widget.setGeometry(QRect(cursorPos - QPoint(50, 50), screenGeometry.size() / 4));
    QCursor::setPos(cursorPos);

    if (!QTest::qWaitFor([&]{ return widget.geometry().contains(QCursor::pos()); }))
        QSKIP("We can't move the cursor");
    widget.show();
    QApplicationPrivate::setActiveWindow(&widget);
    QVERIFY(QTest::qWaitForWindowActive(&widget));

    ++expectedEnter;
    QTRY_COMPARE_WITH_TIMEOUT(widget.numEnterEvents, expectedEnter, 1000);
    QCOMPARE(widget.enterPosition, widget.mapFromGlobal(cursorPos));
    QVERIFY(widget.underMouse());

    QTest::mouseClick(&widget, Qt::LeftButton, {}, widget.mapFromGlobal(cursorPos));
    ++expectedLeave;
    QTRY_COMPARE_WITH_TIMEOUT(widget.numLeaveEvents, expectedLeave, 1000);
    QVERIFY(!widget.underMouse());
    QTRY_VERIFY(QApplication::activeModalWidget() || QApplication::activePopupWidget());
    if (QApplication::activeModalWidget())
        QApplication::activeModalWidget()->close();
    else if (QApplication::activePopupWidget())
        QApplication::activePopupWidget()->close();
    ++expectedEnter;
    // Use default timeout, the test is flaky on Windows otherwise.
    QTRY_VERIFY(widget.numEnterEvents >= expectedEnter);
    // When a modal dialog closes we might get more than one enter event on macOS.
    // This seems to depend on timing, so we tolerate that flakiness for now.
    if (widget.numEnterEvents > expectedEnter && QGuiApplication::platformName() == "cocoa")
        QEXPECT_FAIL("dialog", "On macOS, we might get more than one Enter event", Continue);

    QCOMPARE(widget.numEnterEvents, expectedEnter);
    QCOMPARE(widget.enterPosition, widget.mapFromGlobal(cursorPos));
    QVERIFY(widget.underMouse());
}
#endif

#ifndef QT_NO_CURSOR
void tst_QWidget::taskQTBUG_4055_sendSyntheticEnterLeave()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: Clients can't set cursor position on wayland.");
    class SELParent : public QWidget
    {
    public:
        using QWidget::QWidget;

        void mousePressEvent(QMouseEvent *) override { child->show(); }
        QWidget *child = nullptr;
    };

    class SELChild : public QWidget
    {
    public:
        using QWidget::QWidget;
        void enterEvent(QEnterEvent *) override { ++numEnterEvents; }
        void mouseMoveEvent(QMouseEvent *event) override
        {
            QCOMPARE(event->button(), Qt::NoButton);
            QCOMPARE(event->buttons(), QApplication::mouseButtons());
            QCOMPARE(event->modifiers(), QApplication::keyboardModifiers());
            ++numMouseMoveEvents;
        }
        void reset() { numEnterEvents = numMouseMoveEvents = 0; }
        int numEnterEvents = 0, numMouseMoveEvents = 0;
    };

    QCursor::setPos(m_safeCursorPos);
    if (!QTest::qWaitFor([this]{ return QCursor::pos() == m_safeCursorPos; }))
        QSKIP("Can't move cursor");

    SELParent parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    parent.move(200, 200);
    parent.resize(200, 200);
    SELChild child(&parent);
    child.resize(200, 200);
    parent.show();
    QVERIFY(QTest::qWaitForWindowActive(&parent));

    const QPoint childPos = child.mapToGlobal(QPoint(100, 100));
    QCursor::setPos(childPos);
    if (!QTest::qWaitFor([childPos]{ return QCursor::pos() == childPos; }))
        QSKIP("Can't move cursor");

    // Make sure the cursor has entered the child.
    QTRY_VERIFY(child.numEnterEvents > 0);

    child.hide();
    child.reset();
    child.show();

    // Make sure the child gets enter event and no mouse move event.
    QTRY_COMPARE(child.numEnterEvents, 1);
    QCOMPARE(child.numMouseMoveEvents, 0);

    child.hide();
    child.reset();
    child.setMouseTracking(true);
    child.show();

    // Make sure the child gets enter event.
    // Note that we verify event->button() and event->buttons()
    // in SELChild::mouseMoveEvent().
    QTRY_COMPARE(child.numEnterEvents, 1);
    QCOMPARE(child.numMouseMoveEvents, 0);

    // Sending synthetic enter/leave through the parent's mousePressEvent handler.
    parent.child = &child;

    child.hide();
    child.reset();
    QTest::mouseClick(&parent, Qt::LeftButton);

    // Make sure the child gets enter event.
    QTRY_COMPARE(child.numEnterEvents, 1);
    QCOMPARE(child.numMouseMoveEvents, 0);

    child.hide();
    child.reset();
    QTest::keyPress(&parent, Qt::Key_Shift);
    QTest::mouseClick(&parent, Qt::LeftButton);

    // Make sure the child gets enter event
    QTRY_COMPARE(child.numEnterEvents, 1);
    QCOMPARE(child.numMouseMoveEvents, 0);
    QTest::keyRelease(&child, Qt::Key_Shift);
    child.hide();
    child.reset();
    child.setMouseTracking(false);
    QTest::mouseClick(&parent, Qt::LeftButton);

    // Make sure the child gets enter event and no mouse move event.
    QTRY_COMPARE(child.numEnterEvents, 1);
    QCOMPARE(child.numMouseMoveEvents, 0);
 }

void tst_QWidget::hoverPosition()
{
    if (m_platform == QStringLiteral("wayland"))
        QSKIP("Wayland: Clients can't set cursor position on wayland.");

    class HoverWidget : public QWidget
    {
    public:
        HoverWidget(QWidget *parent = nullptr) : QWidget(parent) {
            setMouseTracking(true);
            setAttribute(Qt::WA_Hover);
        }
        bool event(QEvent *ev) override {
            switch (ev->type()) {
            case QEvent::HoverMove:
                // The docs say that WA_Hover will cause a paint event on enter and leave, but not on move.
                update();
                Q_FALLTHROUGH();
            case QEvent::HoverEnter:
            case QEvent::HoverLeave: {
                qCDebug(lcTests) << ev;
                lastHoverType = ev->type();
                ++hoverEventCount;
                QHoverEvent *hov = static_cast<QHoverEvent *>(ev);
                mousePos = hov->position().toPoint();
                mouseScenePos = hov->scenePosition().toPoint();
                if (ev->type() == QEvent::HoverEnter)
                    mouseEnterScenePos = hov->scenePosition().toPoint();
                break;
            }
            default:
                break;
            }
            return QWidget::event(ev);
        }
        void paintEvent(QPaintEvent *) override {
            ++paintEventCount;
            QPainter painter(this);
            if (mousePos.x() > 0)
                painter.setPen(Qt::red);
            painter.drawRect(0, 0, width(), height());
            painter.setPen(Qt::darkGreen);
            painter.drawLine(mousePos - QPoint(crossHalfWidth, 0), mousePos + QPoint(crossHalfWidth, 0));
            painter.drawLine(mousePos - QPoint(0, crossHalfWidth), mousePos + QPoint(0, crossHalfWidth));
        }

        QEvent::Type lastHoverType = QEvent::None;
        int hoverEventCount = 0;
        int paintEventCount = 0;
        QPoint mousePos;
        QPoint mouseScenePos;
        QPoint mouseEnterScenePos;

    private:
        const int crossHalfWidth = 5;
    };

    QCursor::setPos(m_safeCursorPos);
    if (!QTest::qWaitFor([this]{ return QCursor::pos() == m_safeCursorPos; }))
        QSKIP("Can't move cursor");

    QWidget root;
    root.resize(300, 300);
    HoverWidget h(&root);
    h.setGeometry(100, 100, 100, 100);
    root.show();
    QVERIFY(QTest::qWaitForWindowExposed(&root));

    const QPoint middle(50, 50);
    // wait until we got the correct global pos
    QPoint expectedGlobalPos = root.geometry().topLeft() + QPoint(100, 100) + middle;
    if (!QTest::qWaitFor([&]{ return expectedGlobalPos == h.mapToGlobal(middle); }))
        QSKIP("Can't move cursor");
    QPoint curpos = h.mapToGlobal(middle);
    QCursor::setPos(curpos);
    if (!QTest::qWaitFor([curpos]{ return QCursor::pos() == curpos; }))
          QSKIP("Can't move cursor");
    QTRY_COMPARE_GE(h.hoverEventCount, 1); // HoverEnter and then probably HoverMove, so usually 2
    QTRY_COMPARE_GE(h.paintEventCount, 2);
    const int enterHoverEventCount = h.hoverEventCount;
    qCDebug(lcTests) << "hover enter events:" << enterHoverEventCount << "last was" << h.lastHoverType
                     << "; paint events:" << h.paintEventCount;
    QCOMPARE(h.mousePos, middle);
    QCOMPARE(h.mouseEnterScenePos, h.mapToParent(middle));
    QCOMPARE(h.mouseScenePos, h.mapToParent(middle));
    QCOMPARE(h.lastHoverType, enterHoverEventCount == 1 ? QEvent::HoverEnter : QEvent::HoverMove);

    curpos += {10, 10};
    QCursor::setPos(curpos);
    if (!QTest::qWaitFor([curpos]{ return QCursor::pos() == curpos; }))
          QSKIP("Can't move cursor");
    QTRY_COMPARE(h.hoverEventCount, enterHoverEventCount + 1);
    QCOMPARE(h.lastHoverType, QEvent::HoverMove);
    QTRY_COMPARE_GE(h.paintEventCount, 3);

    curpos += {50, 50}; // in the outer widget, but leaving the inner widget
    QCursor::setPos(curpos);
    if (!QTest::qWaitFor([curpos]{ return QCursor::pos() == curpos; }))
          QSKIP("Can't move cursor");
    QTRY_COMPARE(h.lastHoverType, QEvent::HoverLeave);
    QCOMPARE_GE(h.hoverEventCount, enterHoverEventCount + 2);
    QTRY_COMPARE_GE(h.paintEventCount, 4);
}
#endif

void tst_QWidget::windowFlags()
{
    QWidget w;
    const auto baseFlags = w.windowFlags();
    w.setWindowFlags(w.windowFlags() | Qt::FramelessWindowHint);
    QVERIFY(w.windowFlags() & Qt::FramelessWindowHint);
    w.setWindowFlag(Qt::WindowStaysOnTopHint, true);
    QCOMPARE(w.windowFlags(), baseFlags | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
    w.setWindowFlag(Qt::FramelessWindowHint, false);
    QCOMPARE(w.windowFlags(), baseFlags | Qt::WindowStaysOnTopHint);
}

void tst_QWidget::initialPosForDontShowOnScreenWidgets()
{
    { // Check default position.
        const QPoint expectedPos(0, 0);
        QWidget widget;
        widget.setAttribute(Qt::WA_DontShowOnScreen);
        widget.winId(); // Make sure QWidgetPrivate::create is called.
        QCOMPARE(widget.pos(), expectedPos);
        QCOMPARE(widget.geometry().topLeft(), expectedPos);
    }

    { // Explicitly move to a position.
        const QPoint expectedPos(100, 100);
        QWidget widget;
        widget.setAttribute(Qt::WA_DontShowOnScreen);
        widget.move(expectedPos);
        widget.winId(); // Make sure QWidgetPrivate::create is called.
        QCOMPARE(widget.pos(), expectedPos);
        QCOMPARE(widget.geometry().topLeft(), expectedPos);
    }
}

class MyEvilObject : public QObject
{
    Q_OBJECT
public:
    explicit MyEvilObject(QWidget *widgetToCrash) : QObject(), widget(widgetToCrash)
    {
        connect(widget, &QObject::destroyed, this, &MyEvilObject::beEvil);
        delete widget;
    }
    QWidget *widget;

private slots:
    void beEvil(QObject *) { widget->update(0, 0, 150, 150); }
};

void tst_QWidget::updateOnDestroyedSignal()
{
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));

    QWidget *child = new QWidget(&widget);
    child->resize(m_testWidgetSize);
    child->setAutoFillBackground(true);
    child->setPalette(Qt::red);

    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));

    // Please do not crash.
    MyEvilObject evil(child);
    QTest::qWait(200);
}

void tst_QWidget::toplevelLineEditFocus()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QLineEdit w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.setMinimumWidth(m_testWidgetSize.width());
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));

    QTRY_COMPARE(QApplication::activeWindow(), static_cast<const QWidget *>(&w));
    QTRY_COMPARE(QApplication::focusWidget(), static_cast<const QWidget *>(&w));
}

void tst_QWidget::focusWidget_task254563()
{
    //having different visibility for widget is important
    QWidget top;
    top.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    top.show();
    QWidget container(&top);
    QWidget *widget = new QWidget(&container);
    widget->show();

    widget->setFocus(); //set focus (will set the focus widget up to the toplevel to be 'widget')
    container.setFocus();
    delete widget; // will call clearFocus but that doesn't help
    QVERIFY(top.focusWidget() != widget); //dangling pointer
}

// This test case relies on developer build (AUTOTEST_EXPORT).
#ifdef QT_BUILD_INTERNAL
void tst_QWidget::destroyBackingStore()
{
    UpdateWidget w;
    w.setPalette(simplePalette());
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    centerOnScreen(&w);
    w.reset();
    w.show();

    QVERIFY(QTest::qWaitForWindowExposed(&w));
    QApplication::processEvents();
    QTRY_VERIFY(w.numPaintEvents > 0);
    w.reset();
    w.update();
    qt_widget_private(&w)->topData()->repaintManager.reset(new QWidgetRepaintManager(&w));

    w.update();
    QApplication::processEvents();

    QCOMPARE(w.numPaintEvents, 1);

    // Check one more time, because the second time around does more caching.
    w.update();
    QApplication::processEvents();
    QCOMPARE(w.numPaintEvents, 2);
}
#endif // QT_BUILD_INTERNAL

// Helper function
QWidgetRepaintManager* repaintManager(QWidget &widget)
{
    QWidgetRepaintManager *repaintManager = nullptr;
#ifdef QT_BUILD_INTERNAL
    if (QTLWExtra *topExtra = qt_widget_private(&widget)->maybeTopData())
        repaintManager = topExtra->repaintManager.get();
#endif
    return repaintManager;
}

// Tables of 5000 elements do not make sense on Windows Mobile.
void tst_QWidget::rectOutsideCoordinatesLimit_task144779()
{
#ifndef QT_NO_CURSOR
    QGuiApplication::setOverrideCursor(Qt::BlankCursor); //keep the cursor out of screen grabs
#endif
    QWidget main(nullptr, Qt::FramelessWindowHint); //don't get confused by the size of the window frame
    main.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QPalette palette;
    palette.setColor(QPalette::Window, Qt::red);
    main.setPalette(palette);

    QRect desktopDimensions = main.screen()->availableGeometry();
    QSize mainSize(400, 400);
    mainSize = mainSize.boundedTo(desktopDimensions.size());
    main.resize(mainSize);

    QWidget *offsetWidget = new QWidget(&main);
    offsetWidget->setGeometry(0, -(15000 - mainSize.height()), mainSize.width(), 15000);

    // big widget is too big for the coordinates, it must be limited by wrect
    // if wrect is not at the right position because of offsetWidget, bigwidget
    // is not painted correctly
    QWidget *bigWidget = new QWidget(offsetWidget);
    bigWidget->setGeometry(0, 0, mainSize.width(), 50000);
    palette.setColor(QPalette::Window, Qt::green);
    bigWidget->setPalette(palette);
    bigWidget->setAutoFillBackground(true);

    main.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&main));

    QPixmap correct(main.size());
    correct.fill(Qt::green);
    const QPixmap mainPixmap = grabFromWidget(&main, QRect(QPoint(0, 0), QSize(-1, -1)));

    QTRY_COMPARE(mainPixmap.toImage().convertToFormat(QImage::Format_RGB32),
                 correct.toImage().convertToFormat(QImage::Format_RGB32));
#ifndef QT_NO_CURSOR
    QGuiApplication::restoreOverrideCursor();
#endif
}

void tst_QWidget::setGraphicsEffect()
{
    // Check that we don't have any effect by default.
    QScopedPointer<QWidget> widget(new QWidget);
    widget->setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QVERIFY(!widget->graphicsEffect());

    // SetGet check.
    QPointer<QGraphicsEffect> blurEffect = new QGraphicsBlurEffect;
    widget->setGraphicsEffect(blurEffect);
    QCOMPARE(widget->graphicsEffect(), static_cast<QGraphicsEffect *>(blurEffect));

    // Ensure the existing effect is deleted when setting a new one.
    QPointer<QGraphicsEffect> shadowEffect = new QGraphicsDropShadowEffect;
    widget->setGraphicsEffect(shadowEffect);
    QVERIFY(!blurEffect);
    QCOMPARE(widget->graphicsEffect(), static_cast<QGraphicsEffect *>(shadowEffect));
    blurEffect = new QGraphicsBlurEffect;

    // Ensure the effect is uninstalled when setting it on a new target.
    QScopedPointer<QWidget> anotherWidget(new QWidget);
    anotherWidget->setGraphicsEffect(blurEffect);
    widget->setGraphicsEffect(blurEffect);
    QVERIFY(!anotherWidget->graphicsEffect());
    QVERIFY(!shadowEffect);

    // Ensure the existing effect is deleted when deleting the widget.
    widget.reset();
    QVERIFY(!blurEffect);
    anotherWidget.reset();

    // Ensure the effect is uninstalled when deleting it
    widget.reset(new QWidget);
    blurEffect = new QGraphicsBlurEffect;
    widget->setGraphicsEffect(blurEffect);
    delete blurEffect;
    QVERIFY(!widget->graphicsEffect());

    // Ensure the existing effect is uninstalled and deleted when setting a null effect
    blurEffect = new QGraphicsBlurEffect;
    widget->setGraphicsEffect(blurEffect);
    widget->setGraphicsEffect(nullptr);
    QVERIFY(!widget->graphicsEffect());
    QVERIFY(!blurEffect);
}


class TestGraphicsEffect : public QGraphicsEffect
{
public:
    TestGraphicsEffect(QObject *parent = nullptr)
        : QGraphicsEffect(parent)
    {
        m_pattern = QPixmap(10, 10);
        m_pattern.fill(Qt::lightGray);
        QPainter p(&m_pattern);
        p.fillRect(QRectF(0, 0, 5, 5), QBrush(Qt::darkGray));
        p.fillRect(QRectF(5, 5, 5, 5), QBrush(Qt::darkGray));
    }
    void setExtent(int extent)
    {
        m_extent = extent;
    }
    QRectF boundingRectFor(const QRectF &sr) const override
    {
        return QRectF(sr.x() - m_extent, sr.y() - m_extent,
                      sr.width() + 2 * m_extent, sr.height() + 2 * m_extent);
    }
protected:
    void draw(QPainter *painter) override
    {
        QBrush brush;
        brush.setTexture(m_pattern);
        brush.setStyle(Qt::TexturePattern);
        QPaintDevice *p = painter->device();
        painter->fillRect(QRect(-m_extent, -m_extent,
                                p->width() + m_extent, p->height() + m_extent), brush);
    }
    QPixmap m_pattern;
    int m_extent = 0;
};

static QImage fillExpected1()
{
    QImage expected(QSize(40, 40), QImage::Format_RGB32);
    QPainter p(&expected);
    p.fillRect(QRect{{0, 0}, expected.size()}, QBrush(Qt::gray));
    p.fillRect(QRect(10, 10, 10, 10), QBrush(Qt::red));
    p.fillRect(QRect(20, 20, 10, 10), QBrush(Qt::blue));
    return expected;
}
static QImage fillExpected2()
{
    QImage expected = fillExpected1();
    QPainter p(&expected);
    p.fillRect(QRect(10, 10, 5, 5), QBrush(Qt::darkGray));
    p.fillRect(QRect(15, 15, 5, 5), QBrush(Qt::darkGray));
    p.fillRect(QRect(15, 10, 5, 5), QBrush(Qt::lightGray));
    p.fillRect(QRect(10, 15, 5, 5), QBrush(Qt::lightGray));
    return expected;
}
static QImage fillExpected3()
{
    QImage expected(QSize(40, 40), QImage::Format_RGB32);
    QPixmap pattern;
    pattern = QPixmap(10, 10);
    pattern.fill(Qt::lightGray);
    QPainter p(&pattern);
    p.fillRect(QRectF(0, 0, 5, 5), QBrush(Qt::darkGray));
    p.fillRect(QRectF(5, 5, 5, 5), QBrush(Qt::darkGray));
    QBrush brush;
    brush.setTexture(pattern);
    brush.setStyle(Qt::TexturePattern);
    QPainter p2(&expected);
    p2.fillRect(QRect{{0, 0}, expected.size()}, brush);
    return expected;
}
static QImage fillExpected4()
{
    QImage expected = fillExpected1();
    QPixmap pattern;
    pattern = QPixmap(10, 10);
    pattern.fill(Qt::lightGray);
    QPainter p(&pattern);
    p.fillRect(QRectF(0, 0, 5, 5), QBrush(Qt::darkGray));
    p.fillRect(QRectF(5, 5, 5, 5), QBrush(Qt::darkGray));
    QBrush brush;
    brush.setTexture(pattern);
    brush.setStyle(Qt::TexturePattern);
    QPainter p2(&expected);
    p2.fillRect(QRect{{15, 15}, QSize{20, 20}}, brush);
    return expected;
}

void tst_QWidget::render_graphicsEffect_data()
{
    QTest::addColumn<QImage>("expected");
    QTest::addColumn<bool>("topLevelEffect");
    QTest::addColumn<bool>("child1Effect");
    QTest::addColumn<bool>("child2Effect");
    QTest::addColumn<int>("extent");

    QTest::addRow("no_effect") << fillExpected1() << false << false << false << 0;
    QTest::addRow("first_child_effect") << fillExpected2() << false << true << false << 0;
    QTest::addRow("top_level_effect") << fillExpected3() << true << false << false << 0;
    QTest::addRow("effect_with_extent") << fillExpected4() << false << false << true << 5;
}

void tst_QWidget::render_graphicsEffect()
{
    QFETCH(QImage, expected);
    QFETCH(bool, topLevelEffect);
    QFETCH(bool, child1Effect);
    QFETCH(bool, child2Effect);
    QFETCH(int, extent);

    QScopedPointer<QWidget> topLevel(new QWidget);
    topLevel->setPalette(Qt::gray);
    topLevel->resize(40, 40);
    topLevel->setWindowTitle(QLatin1String(QTest::currentTestFunction()) + QLatin1String("::")
                             + QLatin1String(QTest::currentDataTag()));

    // Render widget with 2 child widgets
    QImage image(topLevel->size(), QImage::Format_RGB32);
    image.fill(QColor(Qt::gray).rgb());

    QPainter painter(&image);

    QWidget *childWidget1(new QWidget(topLevel.data()));
    childWidget1->setAutoFillBackground(true);
    childWidget1->setPalette(Qt::red);
    childWidget1->resize(10, 10);
    childWidget1->move(10, 10);
    QWidget *childWidget2(new QWidget(topLevel.data()));
    childWidget2->setAutoFillBackground(true);
    childWidget2->setPalette(Qt::blue);
    childWidget2->resize(10, 10);
    childWidget2->move(20, 20);

    TestGraphicsEffect *graphicsEffect(new TestGraphicsEffect(topLevel.data()));
    if (topLevelEffect)
        topLevel->setGraphicsEffect(graphicsEffect);
    if (child1Effect)
        childWidget1->setGraphicsEffect(graphicsEffect);
    if (child2Effect)
        childWidget2->setGraphicsEffect(graphicsEffect);
    graphicsEffect->setExtent(extent);

    // Render without effect
    topLevel->render(&painter);
#ifdef RENDER_DEBUG
    image.save("render_GraphicsEffect" + QTest::currentDataTag() + ".png");
    expected.save("render_GraphicsEffect_expected" + QTest::currentDataTag() + ".png");
#endif
    QCOMPARE(image, expected);
}

void tst_QWidget::activateWindow()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("Window activation is not supported.");

    // Test case for QTBUG-26711

    // Create first mainwindow and set it active
    QScopedPointer<QMainWindow> mainwindow(new QMainWindow);
    mainwindow->setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QLabel* label = new QLabel(mainwindow.data());
    label->setMinimumWidth(m_testWidgetSize.width());
    mainwindow->setWindowTitle(QStringLiteral("#1 ") + __FUNCTION__);
    mainwindow->setCentralWidget(label);
    mainwindow->move(m_availableTopLeft + QPoint(100, 100));
    mainwindow->setVisible(true);
    mainwindow->activateWindow();
    QVERIFY(QTest::qWaitForWindowActive(mainwindow.data()));
    QVERIFY(mainwindow->isActiveWindow());

    // Create second mainwindow and set it active
    QScopedPointer<QMainWindow> mainwindow2(new QMainWindow);
    mainwindow2->setWindowTitle(QStringLiteral("#2 ") + __FUNCTION__);
    QLabel* label2 = new QLabel(mainwindow2.data());
    label2->setMinimumWidth(m_testWidgetSize.width());
    mainwindow2->setCentralWidget(label2);
    mainwindow2->move(mainwindow->geometry().bottomLeft() + QPoint(0, 50));
    mainwindow2->setVisible(true);
    mainwindow2->activateWindow();
    QCoreApplication::processEvents();

    QTRY_VERIFY(!mainwindow->isActiveWindow());
    QTRY_VERIFY(mainwindow2->isActiveWindow());

    // Revert first mainwindow back to visible active
    mainwindow->setVisible(true);
    mainwindow->activateWindow();
    QCoreApplication::processEvents();

    QTRY_VERIFY(mainwindow->isActiveWindow());
    QTRY_VERIFY(!mainwindow2->isActiveWindow());
}

void tst_QWidget::openModal_taskQTBUG_5804()
{
#ifdef Q_OS_ANDROID
    QSKIP("This test hangs on Android");
#endif
    class Widget : public QWidget
    {
    public:
        Widget(QWidget *parent) : QWidget(parent) {}
        ~Widget()
        {
            QMessageBox msgbox;
            QTimer::singleShot(10, &msgbox, SLOT(accept()));
            msgbox.exec(); //open a modal dialog
        }
    };

    QScopedPointer<QWidget> win(new QWidget);
    win->resize(m_testWidgetSize);
    win->setWindowTitle(__FUNCTION__);
    centerOnScreen(win.data());

    new Widget(win.data());
    win->show();
    QVERIFY(QTest::qWaitForWindowExposed(win.data()));
}

/*!
    Test that the focus proxy receives focus, and that changing the
    focus proxy of a widget that has focus passes focus on correctly.

    The test uses a single window, so we can rely on the window's focus
    widget and the QApplication focus widget to be the same.
*/
void tst_QWidget::focusProxy()
{
    QWidget window;
    window.setFocusPolicy(Qt::StrongFocus);
    class Container : public QWidget
    {
    public:
        Container()
        {
            edit = new QLineEdit;
            edit->installEventFilter(this);
            setFocusProxy(edit);
            QHBoxLayout *layout = new QHBoxLayout;
            layout->addWidget(edit);
            setLayout(layout);
        }

        QLineEdit *edit;
        int focusInCount = 0;
        int focusOutCount = 0;

    protected:
        bool eventFilter(QObject *receiver, QEvent *event) override
        {
            if (receiver == edit) {
                switch (event->type()) {
                case QEvent::FocusIn:
                    ++focusInCount;
                    break;
                case QEvent::FocusOut:
                    ++focusOutCount;
                    break;
                default:
                    break;
                }
            }

            return QWidget::eventFilter(receiver, event);
        }
    };

    auto container1 = new Container;
    container1->edit->setObjectName("edit1");
    auto container2 = new Container;
    container2->edit->setObjectName("edit2");

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(container1);
    layout->addWidget(container2);
    window.setLayout(layout);

    window.setFocus();
    window.show();
    if (!QTest::qWaitForWindowExposed(&window))
        QSKIP("Window exposed failed");
    if (QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation)) {
        window.activateWindow();
        if (!QTest::qWaitForWindowActive(&window))
            QSKIP("Window activation failed");
    } else {
        if (!QTest::qWaitFor([&]() { return window.windowHandle()->isActive(); }, 5000))
            QSKIP("Window activation failed");
    }

    // given a widget without focus proxy
    QVERIFY(window.hasFocus());
    QCOMPARE(&window, QApplication::focusWidget());
    QVERIFY(!container1->hasFocus());
    QVERIFY(!container2->hasFocus());
    QCOMPARE(container1->focusInCount, 0);
    QCOMPARE(container1->focusOutCount, 0);

    // setting a (nested) focus proxy moves focus
    window.setFocusProxy(container1);
    QCOMPARE(window.focusWidget(), container1->edit);
    QCOMPARE(window.focusWidget(), QApplication::focusWidget());
    QVERIFY(window.hasFocus()); // and redirects hasFocus correctly
    QVERIFY(container1->edit->hasFocus());
    QCOMPARE(container1->focusInCount, 1);

    // changing the focus proxy should not move focus
    window.setFocusProxy(container2);
    QCOMPARE(window.focusWidget(), container1->edit);
    QCOMPARE(window.focusWidget(), QApplication::focusWidget());
    QVERIFY(!window.hasFocus());
    QCOMPARE(container1->focusOutCount, 0);

    // but setting focus again does
    window.setFocus();
    QCOMPARE(window.focusWidget(), container2->edit);
    QCOMPARE(window.focusWidget(), QApplication::focusWidget());
    QVERIFY(window.hasFocus());
    QVERIFY(!container1->edit->hasFocus());
    QVERIFY(container2->edit->hasFocus());
    QCOMPARE(container1->focusInCount, 1);
    QCOMPARE(container1->focusOutCount, 1);
    QCOMPARE(container2->focusInCount, 1);
    QCOMPARE(container2->focusOutCount, 0);

    // clearing the focus proxy does not move focus
    window.setFocusProxy(nullptr);
    QCOMPARE(window.focusWidget(), container2->edit);
    QCOMPARE(window.focusWidget(), QApplication::focusWidget());
    QVERIFY(!window.hasFocus());
    QCOMPARE(container1->focusInCount, 1);
    QCOMPARE(container1->focusOutCount, 1);
    QCOMPARE(container2->focusInCount, 1);
    QCOMPARE(container2->focusOutCount, 0);

    // but clearing focus does
    window.focusWidget()->clearFocus();
    QCOMPARE(QApplication::focusWidget(), nullptr);
    QVERIFY(!window.hasFocus());
    QVERIFY(!container2->hasFocus());
    QVERIFY(!container2->edit->hasFocus());
    QCOMPARE(container2->focusOutCount, 1);
}

void tst_QWidget::imEnabledNotImplemented()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("QWindow::requestActivate() is not supported.");

    // Check that a plain widget doesn't report that it supports IM. Only
    // widgets that implements either Qt::ImEnabled, or the Qt4 backup
    // solution, Qt::ImSurroundingText, should do so.
    QWidget topLevel;
    QWidget plain(&topLevel);
    QLineEdit edit(&topLevel);
    topLevel.show();

    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    QApplicationPrivate::setActiveWindow(&topLevel);
    QVERIFY(QTest::qWaitForWindowActive(&topLevel));

    // A plain widget should return false for ImEnabled
    plain.setFocus(Qt::OtherFocusReason);
    QCOMPARE(QApplication::focusWidget(), &plain);
    QVariant imEnabled = QApplication::inputMethod()->queryFocusObject(Qt::ImEnabled, QVariant());
    QVERIFY(imEnabled.isValid());
    QVERIFY(!imEnabled.toBool());

    // But a lineedit should return true
    edit.setFocus(Qt::OtherFocusReason);
    QCOMPARE(QApplication::focusWidget(), &edit);
    imEnabled = QApplication::inputMethod()->queryFocusObject(Qt::ImEnabled, QVariant());
    QVERIFY(imEnabled.isValid());
    QVERIFY(imEnabled.toBool());

    // ImEnabled should be false when a lineedit is read-only since
    // ImEnabled indicates the widget accepts input method _input_.
    edit.setReadOnly(true);
    imEnabled = QApplication::inputMethod()->queryFocusObject(Qt::ImEnabled, QVariant());
    QVERIFY(imEnabled.isValid());
    QVERIFY(!imEnabled.toBool());
}

#ifdef QT_BUILD_INTERNAL
class scrollWidgetWBS : public QWidget
{
public:
    void deleteBackingStore()
    {
        static_cast<QWidgetPrivate*>(d_ptr.data())->topData()->repaintManager.reset(nullptr);
    }
    void enableBackingStore()
    {
        if (!static_cast<QWidgetPrivate*>(d_ptr.data())->maybeRepaintManager()) {
            static_cast<QWidgetPrivate*>(d_ptr.data())->topData()->repaintManager.reset(new QWidgetRepaintManager(this));
            static_cast<QWidgetPrivate*>(d_ptr.data())->invalidateBackingStore(this->rect());
            update();
        }
    }
};
#endif

// Test case relies on developer build (AUTOTEST_EXPORT).
#ifdef QT_BUILD_INTERNAL
void tst_QWidget::scrollWithoutBackingStore()
{
    scrollWidgetWBS scrollable;
    scrollable.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    scrollable.resize(200, 200);
    QLabel child(QString("@"),&scrollable);
    child.resize(50,50);
    scrollable.show();
    QVERIFY(QTest::qWaitForWindowExposed(&scrollable));
    scrollable.scroll(50,50);
    QCOMPARE(child.pos(),QPoint(50,50));
    scrollable.deleteBackingStore();
    scrollable.scroll(-25,-25);
    QCOMPARE(child.pos(),QPoint(25,25));
    scrollable.enableBackingStore();
    QTRY_COMPARE(child.pos(),QPoint(25,25));
}
#endif

void tst_QWidget::taskQTBUG_7532_tabOrderWithFocusProxy()
{
    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.setFocusPolicy(Qt::TabFocus);
    QWidget *fp = new QWidget(&w);
    fp->setFocusPolicy(Qt::TabFocus);
    w.setFocusProxy(fp);
    QWidget::setTabOrder(&w, fp);

    // In debug mode, no assertion failure means it's alright.
}

void tst_QWidget::movedAndResizedAttributes()
{
    // Use Qt::Tool as fully decorated windows have a minimum width of 160 on
    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.show();

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setWindowState(Qt::WindowFullScreen);

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setWindowState(Qt::WindowMaximized);

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.setWindowState(Qt::WindowMinimized);

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.showNormal();

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.showMaximized();

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.showFullScreen();

    QVERIFY(!w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.showNormal();
    w.move(m_availableTopLeft);
    QVERIFY(w.testAttribute(Qt::WA_Moved));
    QVERIFY(!w.testAttribute(Qt::WA_Resized));

    w.resize(m_testWidgetSize);
    QVERIFY(w.testAttribute(Qt::WA_Moved));
    QVERIFY(w.testAttribute(Qt::WA_Resized));
}

void tst_QWidget::childAt()
{
    QWidget parent(nullptr, Qt::FramelessWindowHint);
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    parent.resize(200, 200);

    QWidget *child = new QWidget(&parent);
    child->setPalette(Qt::red);
    child->setAutoFillBackground(true);
    child->setGeometry(20, 20, 160, 160);

    QWidget *grandChild = new QWidget(child);
    grandChild->setPalette(Qt::blue);
    grandChild->setAutoFillBackground(true);
    grandChild->setGeometry(-20, -20, 220, 220);

    QVERIFY(!parent.childAt(19, 19));
    QVERIFY(!parent.childAt(180, 180));
    QCOMPARE(parent.childAt(20, 20), grandChild);
    QCOMPARE(parent.childAt(179, 179), grandChild);

    grandChild->setAttribute(Qt::WA_TransparentForMouseEvents);
    QCOMPARE(parent.childAt(20, 20), child);
    QCOMPARE(parent.childAt(179, 179), child);
    grandChild->setAttribute(Qt::WA_TransparentForMouseEvents, false);

    child->setMask(QRect(50, 50, 60, 60));

    QVERIFY(!parent.childAt(69, 69));
    QVERIFY(!parent.childAt(130, 130));
    QCOMPARE(parent.childAt(70, 70), grandChild);
    QCOMPARE(parent.childAt(129, 129), grandChild);

    child->setAttribute(Qt::WA_MouseNoMask);
    QCOMPARE(parent.childAt(69, 69), grandChild);
    QCOMPARE(parent.childAt(130, 130), grandChild);
    child->setAttribute(Qt::WA_MouseNoMask, false);

    grandChild->setAttribute(Qt::WA_TransparentForMouseEvents);
    QCOMPARE(parent.childAt(70, 70), child);
    QCOMPARE(parent.childAt(129, 129), child);
    grandChild->setAttribute(Qt::WA_TransparentForMouseEvents, false);

    grandChild->setMask(QRect(80, 80, 40, 40));

    QCOMPARE(parent.childAt(79, 79), child);
    QCOMPARE(parent.childAt(120, 120), child);
    QCOMPARE(parent.childAt(80, 80), grandChild);
    QCOMPARE(parent.childAt(119, 119), grandChild);

    grandChild->setAttribute(Qt::WA_MouseNoMask);

    QCOMPARE(parent.childAt(79, 79), grandChild);
    QCOMPARE(parent.childAt(120, 120), grandChild);
}

#ifdef Q_OS_MACOS

void tst_QWidget::taskQTBUG_11373()
{
    QSKIP("QTBUG-52974");

    QScopedPointer<QMainWindow> myWindow(new QMainWindow);
    QWidget * center = new QWidget();
    myWindow -> setCentralWidget(center);
    QWidget * drawer = new QWidget(myWindow.data(), Qt::Drawer);
    drawer -> hide();
    QCOMPARE(drawer->isVisible(), false);
    myWindow -> show();
    myWindow -> raise();
    // The drawer shouldn't be visible now.
    QCOMPARE(drawer->isVisible(), false);
    myWindow -> setWindowState(Qt::WindowFullScreen);
    myWindow -> setWindowState(Qt::WindowNoState);
    // The drawer should still not be visible, since we haven't shown it.
    QCOMPARE(drawer->isVisible(), false);
}

#endif

void tst_QWidget::taskQTBUG_17333_ResizeInfiniteRecursion()
{
    QTableView tb;
    tb.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    const char *s = "border: 1px solid;";
    tb.setStyleSheet(s);
    tb.show();

    QVERIFY(QTest::qWaitForWindowExposed(&tb));
    tb.setGeometry(QRect(100, 100, 0, 100));
    // No crash, it works.
}

void tst_QWidget::nativeChildFocus()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.setMinimumWidth(m_testWidgetSize.width());
    w.setWindowTitle(__FUNCTION__);
    QLayout *layout = new QVBoxLayout;
    w.setLayout(layout);
    QLineEdit *p1 = new QLineEdit;
    QLineEdit *p2 = new QLineEdit;
    layout->addWidget(p1);
    layout->addWidget(p2);
    p1->setObjectName("p1");
    p2->setObjectName("p2");
    centerOnScreen(&w);
    w.show();
    w.activateWindow();
    p1->setFocus();
    p1->setAttribute(Qt::WA_NativeWindow);
    p2->setAttribute(Qt::WA_NativeWindow);
    QVERIFY(QTest::qWaitForWindowExposed(&w));

    QCOMPARE(QApplication::activeWindow(), &w);
    QCOMPARE(QApplication::focusWidget(), static_cast<QWidget*>(p1));
}

static bool lenientCompare(const QPixmap &actual, const QPixmap &expected)
{
    QImage expectedImage = expected.toImage().convertToFormat(QImage::Format_RGB32);
    QImage actualImage = actual.toImage().convertToFormat(QImage::Format_RGB32);

    if (expectedImage.size() != actualImage.size()) {
        qWarning("Image size comparison failed: expected: %dx%d, got %dx%d",
                 expectedImage.size().width(), expectedImage.size().height(),
                 actualImage.size().width(), actualImage.size().height());
        return false;
    }

    const int size = actual.width() * actual.height();
    const int threshold = QPixmap::defaultDepth() == 16 ? 10 : 2;

    auto a = reinterpret_cast<const QRgb *>(actualImage.bits());
    auto e = reinterpret_cast<const QRgb *>(expectedImage.bits());
    for (int i = 0; i < size; ++i) {
        const QColor ca(a[i]);
        const QColor ce(e[i]);
        if (qAbs(ca.red() - ce.red()) > threshold
            || qAbs(ca.green() - ce.green()) > threshold
            || qAbs(ca.blue() - ce.blue()) > threshold) {
            qWarning("Color mismatch at pixel #%d: Expected: %d,%d,%d, got %d,%d,%d",
                     i, ce.red(), ce.green(), ce.blue(), ca.red(), ca.green(), ca.blue());
            return false;
        }
    }

    return true;
}

void tst_QWidget::grab()
{
    for (int opaque = 0; opaque < 2; ++opaque) {
        QWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        QImage image(128, 128, opaque ? QImage::Format_RGB32 : QImage::Format_ARGB32_Premultiplied);
        for (int row = 0; row < image.height(); ++row) {
            QRgb *line = reinterpret_cast<QRgb *>(image.scanLine(row));
            for (int col = 0; col < image.width(); ++col)
                line[col] = qRgba(QRandomGenerator::global()->bounded(255), row, col, opaque ? 255 : 127);
        }

        QPalette pal = widget.palette();
        pal.setBrush(QPalette::Window, QBrush(image));
        widget.setPalette(pal);
        widget.resize(128, 128);

        QPixmap expected(64, 64);
        if (!opaque)
            expected.fill(Qt::transparent);

        QPainter p(&expected);
        p.translate(-64, -64);
        p.drawTiledPixmap(0, 0, 128, 128, pal.brush(QPalette::Window).texture(), 0, 0);
        p.end();

        QPixmap actual = grabFromWidget(&widget, QRect(64, 64, 64, 64));
        QVERIFY(lenientCompare(actual, expected));

        actual = grabFromWidget(&widget, QRect(64, 64, -1, -1));
        QVERIFY(lenientCompare(actual, expected));

        // Make sure a widget that is not yet shown is grabbed correctly.
        QTreeWidget widget2;
        actual = widget2.grab(QRect());
        widget2.show();
        expected = widget2.grab(QRect());

        QVERIFY(lenientCompare(actual, expected));
    }
}

/* grabMouse() tests whether mouse grab for a widget without window handle works.
 * It creates a top level widget with another nested widget inside. The inner widget grabs
 * the mouse and a series of mouse presses moving over the top level's window is simulated.
 * Only the inner widget should receive events. */

static inline QString mouseEventLogEntry(const QString &objectName, QEvent::Type t, const QPoint &p, Qt::MouseButtons b)
{
    QString result;
    QDebug(&result).nospace() << objectName << " Mouse event " << t << " at " << p << " buttons " << b;
    return result;
}

class GrabLoggerWidget : public QWidget
{
public:
    explicit GrabLoggerWidget(QStringList *log, QWidget *parent = nullptr)  : QWidget(parent), m_log(log) {}

protected:
    bool event(QEvent *e) override
    {
        switch (e->type()) {
        case QEvent::MouseButtonPress:
        case QEvent::MouseMove:
        case QEvent::MouseButtonRelease: {
            QMouseEvent *me = static_cast<QMouseEvent *>(e);
            m_log->push_back(mouseEventLogEntry(objectName(), me->type(), me->position().toPoint(), me->buttons()));
            me->accept();
            return true;
        }
        default:
            break;
        }
        return QWidget::event(e);
    }
private:
    QStringList *m_log;
};

void tst_QWidget::grabMouse()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QStringList log;
    GrabLoggerWidget w(&log);
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.setObjectName(QLatin1String("tst_qwidget_grabMouse"));
    w.setWindowTitle(w.objectName());
    QLayout *layout = new QVBoxLayout(&w);
    layout->setContentsMargins(50, 50, 50, 50);
    GrabLoggerWidget *grabber = new GrabLoggerWidget(&log, &w);
    const QString grabberObjectName = QLatin1String("tst_qwidget_grabMouse_grabber");
    grabber->setObjectName(grabberObjectName);
    grabber->setMinimumSize(m_testWidgetSize);
    layout->addWidget(grabber);
    centerOnScreen(&w);
    w.show();
    QApplicationPrivate::setActiveWindow(&w);
    QVERIFY(QTest::qWaitForWindowActive(&w));

    QStringList expectedLog;
    QPoint mousePos = QPoint(w.width() / 2, 10);
    QTest::mouseMove(w.windowHandle(), mousePos);
    grabber->grabMouse();
    const int step = w.height() / 5;
    for ( ; mousePos.y() < w.height() ; mousePos.ry() += step) {
        QTest::mouseClick(w.windowHandle(), Qt::LeftButton, Qt::KeyboardModifiers(), mousePos);
        // Events should go to the grabber child using its coordinates.
        const QPoint expectedPos = grabber->mapFromParent(mousePos);
        expectedLog.push_back(mouseEventLogEntry(grabberObjectName, QEvent::MouseButtonPress, expectedPos, Qt::LeftButton));
        expectedLog.push_back(mouseEventLogEntry(grabberObjectName, QEvent::MouseButtonRelease, expectedPos, Qt::NoButton));
    }
    grabber->releaseMouse();
    QCOMPARE(log, expectedLog);
}

void tst_QWidget::grabKeyboard()
{
    if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("Wayland: This fails. Figure out why.");

    QWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.setObjectName(QLatin1String("tst_qwidget_grabKeyboard"));
    w.setWindowTitle(w.objectName());
    QLayout *layout = new QVBoxLayout(&w);
    QLineEdit *grabber = new QLineEdit(&w);
    grabber->setMinimumWidth(m_testWidgetSize.width());
    layout->addWidget(grabber);
    QLineEdit *nonGrabber = new QLineEdit(&w);
    nonGrabber->setMinimumWidth(m_testWidgetSize.width());
    layout->addWidget(nonGrabber);
    centerOnScreen(&w);
    w.show();
    QApplicationPrivate::setActiveWindow(&w);
    QVERIFY(QTest::qWaitForWindowActive(&w));
    nonGrabber->setFocus();
    grabber->grabKeyboard();
    QTest::keyClick(w.windowHandle(), Qt::Key_A);
    grabber->releaseKeyboard();
    QCOMPARE(grabber->text().toLower(), QStringLiteral("a"));
    QVERIFY2(nonGrabber->text().isEmpty(), qPrintable(nonGrabber->text()));
}

class TouchMouseWidget : public QWidget {
public:
    explicit TouchMouseWidget(QWidget *parent = nullptr) : QWidget(parent)
    {
        resize(200, 200);
    }

    void setAcceptTouch(bool accept)
    {
        m_acceptTouch = accept;
        setAttribute(Qt::WA_AcceptTouchEvents, accept);
    }

    void setAcceptMouse(bool accept)
    {
        m_acceptMouse = accept;
    }

protected:
    bool event(QEvent *e) override
    {
        qCDebug(lcTests) << e;
        switch (e->type()) {
        case QEvent::TouchBegin:
        case QEvent::TouchCancel:
        case QEvent::TouchUpdate:
        case QEvent::TouchEnd: {
            auto te = static_cast<QTouchEvent *>(e);
            touchDevice = const_cast<QPointingDevice *>(te->pointingDevice());
            touchPointStates = te->touchPointStates();
            touchPoints = te->points();
            if (e->type() == QEvent::TouchBegin)
                ++m_touchBeginCount;
            else if (e->type() == QEvent::TouchCancel)
                ++m_touchCancelCount;
            else if (e->type() == QEvent::TouchUpdate)
                ++m_touchUpdateCount;
            else if (e->type() == QEvent::TouchEnd)
                ++m_touchEndCount;
            ++m_touchEventCount;
            if (m_acceptTouch)
                e->accept();
            else
                e->ignore();
        }
            return true;
        case QEvent::Gesture:
            ++m_gestureEventCount;
            return true;

        case QEvent::MouseButtonPress:
        case QEvent::MouseMove:
        case QEvent::MouseButtonRelease:
            ++m_mouseEventCount;
            m_lastMouseEventPos = static_cast<QMouseEvent *>(e)->position();
            if (m_acceptMouse)
                e->accept();
            else
                e->ignore();
            return true;

        default:
            return QWidget::event(e);
        }
    }

public:
    int m_touchBeginCount = 0;
    int m_touchCancelCount = 0;
    int m_touchUpdateCount = 0;
    int m_touchEndCount = 0;
    int m_touchEventCount = 0;
    QPointingDevice *touchDevice = nullptr;
    QTouchEvent::TouchPoint::States touchPointStates;
    QList<QTouchEvent::TouchPoint> touchPoints;
    int m_gestureEventCount = 0;
    bool m_acceptTouch = false;
    int m_mouseEventCount = 0;
    bool m_acceptMouse = true;
    QPointF m_lastMouseEventPos;
};

void tst_QWidget::touchEventSynthesizedMouseEvent()
{
    if (m_platform.startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
        QSKIP("This test failed on Wayland. See also QTBUG-107157.");

    {
        // Simple case, we ignore the touch events, we get mouse events instead
        TouchMouseWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        widget.show();
        QVERIFY(QTest::qWaitForWindowExposed(widget.windowHandle()));
        QCOMPARE(widget.m_touchEventCount, 0);
        QCOMPARE(widget.m_mouseEventCount, 0);

        QTest::touchEvent(&widget, m_touchScreen).press(0, QPoint(10, 10), &widget);
        QCOMPARE(widget.m_touchEventCount, 0);
        QCOMPARE(widget.m_mouseEventCount, 1);
        QCOMPARE(widget.m_lastMouseEventPos, QPointF(10, 10));
        QTest::touchEvent(&widget, m_touchScreen).move(0, QPoint(15, 15), &widget);
        QCOMPARE(widget.m_touchEventCount, 0);
        QCOMPARE(widget.m_mouseEventCount, 2);
        QCOMPARE(widget.m_lastMouseEventPos, QPointF(15, 15));
        QTest::touchEvent(&widget, m_touchScreen).release(0, QPoint(20, 20), &widget);
        QCOMPARE(widget.m_touchEventCount, 0);
        QCOMPARE(widget.m_mouseEventCount, 4); // we receive extra mouse move event
        QCOMPARE(widget.m_lastMouseEventPos, QPointF(20, 20));
    }

    {
        // We accept the touch events, no mouse event is generated
        TouchMouseWidget widget;
        widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        widget.setAcceptTouch(true);
        widget.show();
        QVERIFY(QTest::qWaitForWindowExposed(widget.windowHandle()));
        QCOMPARE(widget.m_touchEventCount, 0);
        QCOMPARE(widget.m_mouseEventCount, 0);

        QTest::touchEvent(&widget, m_touchScreen).press(0, QPoint(10, 10), &widget);
        QCOMPARE(widget.m_touchEventCount, 1);
        QCOMPARE(widget.m_mouseEventCount, 0);
        QTest::touchEvent(&widget, m_touchScreen).move(0, QPoint(15, 15), &widget);
        QCOMPARE(widget.m_touchEventCount, 2);
        QCOMPARE(widget.m_mouseEventCount, 0);
        QTest::touchEvent(&widget, m_touchScreen).release(0, QPoint(20, 20), &widget);
        QCOMPARE(widget.m_touchEventCount, 3);
        QCOMPARE(widget.m_mouseEventCount, 0);
    }

    {
        // Parent accepts touch events, child ignore both mouse and touch
        // We should see propagation of the TouchBegin
        TouchMouseWidget parent;
        parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        parent.setAcceptTouch(true);
        TouchMouseWidget child(&parent);
        child.move(5, 5);
        child.setAcceptMouse(false);
        parent.show();
        QVERIFY(QTest::qWaitForWindowExposed(parent.windowHandle()));
        QCOMPARE(parent.m_touchEventCount, 0);
        QCOMPARE(parent.m_mouseEventCount, 0);
        QCOMPARE(child.m_touchEventCount, 0);
        QCOMPARE(child.m_mouseEventCount, 0);

        QTest::touchEvent(parent.window(), m_touchScreen).press(0, QPoint(10, 10), &child);
        QCOMPARE(parent.m_touchEventCount, 1);
        QCOMPARE(parent.m_mouseEventCount, 0);
        QCOMPARE(child.m_touchEventCount, 0);
        QCOMPARE(child.m_mouseEventCount, 0);
    }

    {
        // Parent accepts mouse events, child ignore both mouse and touch
        // We should see propagation of the TouchBegin into a MouseButtonPress
        TouchMouseWidget parent;
        parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
        TouchMouseWidget child(&parent);
        const QPoint childPos(5, 5);
        child.move(childPos);
        child.setAcceptMouse(false);
        parent.show();
        QVERIFY(QTest::qWaitForWindowExposed(parent.windowHandle()));
        QCOMPARE(parent.m_touchEventCount, 0);
        QCOMPARE(parent.m_mouseEventCount, 0);
        QCOMPARE(child.m_touchEventCount, 0);
        QCOMPARE(child.m_mouseEventCount, 0);

        const QPoint touchPos(20, 20);
        QTest::touchEvent(parent.window(), m_touchScreen).press(0, touchPos, &child);
        QCOMPARE(parent.m_touchEventCount, 0);
        QCOMPARE(parent.m_mouseEventCount, 1);
        QCOMPARE(parent.m_lastMouseEventPos, childPos + touchPos);
        QCOMPARE(child.m_touchEventCount, 0);
        QCOMPARE(child.m_mouseEventCount, 1); // Attempt at mouse event before propagation
        QCOMPARE(child.m_lastMouseEventPos, touchPos);
    }
}

void tst_QWidget::touchCancel()
{
    TouchMouseWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.setAcceptTouch(true);
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(widget.windowHandle()));

    { // cancel right after press
        QTest::touchEvent(&widget, m_touchScreen).press(1, QPoint(20, 21), &widget);
        QCOMPARE(widget.m_touchBeginCount, 1);
        QCOMPARE(widget.touchDevice, m_touchScreen);
        QCOMPARE(widget.touchPoints.size(), 1);
        QCOMPARE(widget.touchPointStates, Qt::TouchPointPressed);
        QCOMPARE(widget.touchPoints.first().position(), QPointF(20, 21));

        QWindowSystemInterface::handleTouchCancelEvent(widget.windowHandle(), m_touchScreen);
        QTRY_COMPARE(widget.m_touchCancelCount, 1);
        QCOMPARE(widget.touchDevice, m_touchScreen);
        QCOMPARE(widget.touchPoints.size(), 0);

        // should not propagate, since after cancel there should be only new press
        QTest::touchEvent(&widget, m_touchScreen).move(1, QPoint(25, 26), &widget);
        QCOMPARE(widget.m_touchUpdateCount, 0);
    }

    { // cancel after update
        QTest::touchEvent(&widget, m_touchScreen).press(1, QPoint(30, 31), &widget);
        QCOMPARE(widget.m_touchBeginCount, 2);
        QCOMPARE(widget.touchPoints.size(), 1);
        QCOMPARE(widget.touchPointStates, Qt::TouchPointPressed);
        QCOMPARE(widget.touchPoints.first().position(), QPointF(30, 31));

        QTest::touchEvent(&widget, m_touchScreen).move(1, QPoint(20, 21));
        QCOMPARE(widget.m_touchUpdateCount, 1);
        QCOMPARE(widget.touchPoints.size(), 1);
        QCOMPARE(widget.touchPointStates, Qt::TouchPointMoved);
        QCOMPARE(widget.touchPoints.first().position(), QPointF(20, 21));

        QWindowSystemInterface::handleTouchCancelEvent(widget.windowHandle(), m_touchScreen);
        QTRY_COMPARE(widget.m_touchCancelCount, 2);
        QCOMPARE(widget.touchDevice, m_touchScreen);
        QCOMPARE(widget.touchPoints.size(), 0);

        // should not propagate, since after cancel there should be only new press
        QTest::touchEvent(&widget, m_touchScreen).move(1, QPoint(25, 26), &widget);
        QCOMPARE(widget.m_touchUpdateCount, 1);
    }

    { // proper press/release after multiple cancel events should proceed as usual
        QTest::touchEvent(&widget, m_touchScreen).press(2, QPoint(15, 16), &widget).press(3, QPoint(25, 26), &widget);
        QCOMPARE(widget.m_touchBeginCount, 3);
        QCOMPARE(widget.touchDevice, m_touchScreen);
        QCOMPARE(widget.touchPoints.size(), 2);
        QCOMPARE(widget.touchPointStates, Qt::TouchPointPressed);

        QTest::touchEvent(&widget, m_touchScreen).release(3, QPoint(30, 30), &widget).release(2, QPoint(10, 10), &widget);
        QCOMPARE(widget.m_touchEndCount, 1);
        QCOMPARE(widget.touchDevice, m_touchScreen);
        QCOMPARE(widget.touchPoints.size(), 2);
        QCOMPARE(widget.touchPointStates, Qt::TouchPointReleased);
    }
}

void tst_QWidget::touchUpdateOnNewTouch()
{
    TouchMouseWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.setAcceptTouch(true);
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(new QWidget);
    widget.setLayout(layout);
    widget.show();

    QWindow* window = widget.windowHandle();
    QVERIFY(QTest::qWaitForWindowExposed(window));
    QCOMPARE(widget.m_touchBeginCount, 0);
    QCOMPARE(widget.m_touchUpdateCount, 0);
    QCOMPARE(widget.m_touchEndCount, 0);
    QTest::touchEvent(window, m_touchScreen).press(0, QPoint(20, 20), window);
    QCOMPARE(widget.m_touchBeginCount, 1);
    QCOMPARE(widget.m_touchUpdateCount, 0);
    QCOMPARE(widget.m_touchEndCount, 0);
    QTest::touchEvent(window, m_touchScreen).move(0, QPoint(25, 25), window);
    QCOMPARE(widget.m_touchBeginCount, 1);
    QCOMPARE(widget.m_touchUpdateCount, 1);
    QCOMPARE(widget.m_touchEndCount, 0);
    QTest::touchEvent(window, m_touchScreen).stationary(0).press(1, QPoint(40, 40), window);
    QCOMPARE(widget.m_touchBeginCount, 1);
    QCOMPARE(widget.m_touchUpdateCount, 2);
    QCOMPARE(widget.m_touchEndCount, 0);
    QTest::touchEvent(window, m_touchScreen).stationary(1).release(0, QPoint(25, 25), window);
    QCOMPARE(widget.m_touchBeginCount, 1);
    QCOMPARE(widget.m_touchUpdateCount, 3);
    QCOMPARE(widget.m_touchEndCount, 0);
    QTest::touchEvent(window, m_touchScreen).release(1, QPoint(40, 40), window);
    QCOMPARE(widget.m_touchBeginCount, 1);
    QCOMPARE(widget.m_touchUpdateCount, 3);
    QCOMPARE(widget.m_touchEndCount, 1);
}

void tst_QWidget::touchEventsForGesturePendingWidgets()
{
    TouchMouseWidget parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    TouchMouseWidget child(&parent);
    parent.grabGesture(Qt::TapAndHoldGesture);
    parent.show();

    QWindow* window = parent.windowHandle();
    QVERIFY(QTest::qWaitForWindowExposed(window));
    QTest::qWait(500); // needed for QApplication::topLevelAt(), which is used by QGestureManager
    QCOMPARE(child.m_touchEventCount, 0);
    QCOMPARE(child.m_gestureEventCount, 0);
    QCOMPARE(parent.m_touchEventCount, 0);
    QCOMPARE(parent.m_gestureEventCount, 0);
    QTest::touchEvent(window, m_touchScreen).press(0, QPoint(20, 20), window);
    QCOMPARE(child.m_touchEventCount, 0);
    QCOMPARE(child.m_gestureEventCount, 0);
    QCOMPARE(parent.m_touchBeginCount, 1); // QTapAndHoldGestureRecognizer::create() sets Qt::WA_AcceptTouchEvents
    QCOMPARE(parent.m_touchUpdateCount, 0);
    QCOMPARE(parent.m_touchEndCount, 0);
    QCOMPARE(parent.m_gestureEventCount, 0);
    QTest::touchEvent(window, m_touchScreen).move(0, QPoint(25, 25), window);
    QCOMPARE(child.m_touchEventCount, 0);
    QCOMPARE(child.m_gestureEventCount, 0);
    QCOMPARE(parent.m_touchBeginCount, 1);
    QCOMPARE(parent.m_touchUpdateCount, 0);
    QCOMPARE(parent.m_touchEndCount, 0);
    QCOMPARE(parent.m_gestureEventCount, 0);
    QTest::qWait(1000);
    QTest::touchEvent(window, m_touchScreen).release(0, QPoint(25, 25), window);
    QCOMPARE(child.m_touchEventCount, 0);
    QCOMPARE(child.m_gestureEventCount, 0);
    QCOMPARE(parent.m_touchBeginCount, 1);
    QCOMPARE(parent.m_touchUpdateCount, 0);
    QCOMPARE(parent.m_touchEndCount, 0);
    QVERIFY(parent.m_gestureEventCount > 0);
}

void tst_QWidget::styleSheetPropagation()
{
    QTableView tw;
    tw.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    tw.setStyleSheet("background-color: red;");
    for (QObject *child : tw.children()) {
        if (QWidget *w = qobject_cast<QWidget *>(child))
            QCOMPARE(w->style(), tw.style());
    }
}

class DestroyTester : public QObject
{
    Q_OBJECT
public:
    explicit DestroyTester(QObject *parent = nullptr) : QObject(parent) { parentDestroyed = 0; }
    static int parentDestroyed;
public slots:
    void parentDestroyedSlot() {
        ++parentDestroyed;
    }
};

int DestroyTester::parentDestroyed = 0;

void tst_QWidget::destroyedSignal()
{
    {
        QWidget *w = new QWidget;
        DestroyTester *t = new DestroyTester(w);
        connect(w, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete w;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
    }

    {
        QWidget *w = new QWidget;
        DestroyTester *t = new DestroyTester(w);
        connect(w, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        w->blockSignals(true);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete w;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
    }

    {
        QObject *o = new QWidget;
        DestroyTester *t = new DestroyTester(o);
        connect(o, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete o;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
    }

    {
        QObject *o = new QWidget;
        auto t = new DestroyTester;
        connect(o, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        o->blockSignals(true);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete o;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
    }

    {
        QWidget *w = new QWidget;
        auto t = new DestroyTester;
        connect(w, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete w;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
        delete t;
    }

    {
        QWidget *w = new QWidget;
        auto t = new DestroyTester;
        connect(w, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        w->blockSignals(true);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete w;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
        delete t;
    }

    {
        QObject *o = new QWidget;
        auto t = new DestroyTester;
        connect(o, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete o;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
        delete t;
    }

    {
        QObject *o = new QWidget;
        auto t = new DestroyTester;
        connect(o, &QObject::destroyed, t, &DestroyTester::parentDestroyedSlot);
        o->blockSignals(true);
        QCOMPARE(DestroyTester::parentDestroyed, 0);
        delete o;
        QCOMPARE(DestroyTester::parentDestroyed, 1);
        delete t;
    }

}

#ifndef QT_NO_CURSOR
void tst_QWidget::underMouse()
{
    // Move the mouse cursor to a safe location
    QCursor::setPos(m_safeCursorPos);

    ColorWidget topLevelWidget(nullptr, Qt::FramelessWindowHint, Qt::blue);
    topLevelWidget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    ColorWidget childWidget1(&topLevelWidget, Qt::Widget, Qt::yellow);
    ColorWidget childWidget2(&topLevelWidget, Qt::Widget, Qt::black);
    ColorWidget popupWidget(nullptr, Qt::Popup, Qt::green);

    topLevelWidget.setObjectName("topLevelWidget");
    childWidget1.setObjectName("childWidget1");
    childWidget2.setObjectName("childWidget2");
    popupWidget.setObjectName("popupWidget");

    topLevelWidget.setGeometry(100, 100, 300, 300);
    childWidget1.setGeometry(20, 20, 100, 100);
    childWidget2.setGeometry(20, 120, 100, 100);
    popupWidget.setGeometry(50, 100, 50, 50);

    topLevelWidget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevelWidget));
    QWindow *window = topLevelWidget.windowHandle();

    QPoint outsideWindowPoint(30, -10);
    QPoint inWindowPoint(30, 10);
    QPoint child1Point(30, 50);
    QPoint child2PointA(30, 150);
    QPoint child2PointB(31, 151);

    // Outside window
    QTest::mouseMove(window, outsideWindowPoint);
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());

    // Enter window, outside children
    // Note: QTest::mouseMove will not generate enter events for windows, so send one explicitly
    QWindowSystemInterface::handleEnterEvent(window, inWindowPoint, window->mapToGlobal(inWindowPoint));
    QTest::mouseMove(window, inWindowPoint);
    QVERIFY(topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());

    // In childWidget1
    QTest::mouseMove(window, child1Point);
    QVERIFY(topLevelWidget.underMouse());
    QVERIFY(childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());

    // In childWidget2
    QTest::mouseMove(window, child2PointA);
    QVERIFY(topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(childWidget2.underMouse());

    topLevelWidget.resetCounts();
    childWidget1.resetCounts();
    childWidget2.resetCounts();
    popupWidget.resetCounts();

    // Throw up a popup window
    popupWidget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&popupWidget));
    QWindow *popupWindow = popupWidget.windowHandle();
    QVERIFY(popupWindow);
    QCOMPARE(QApplication::activePopupWidget(), &popupWidget);

    // Send an artificial leave event for window, as it won't get generated automatically
    // due to cursor not actually being over the window. The Cocoa and offscreen plugins
    // do this for us.
    if (QGuiApplication::platformName() != "cocoa" && QGuiApplication::platformName() != "offscreen")
        QWindowSystemInterface::handleLeaveEvent<QWindowSystemInterface::SynchronousDelivery>(window);

    // If there is an active popup, undermouse should not be reported (QTBUG-27478),
    // but opening a popup causes leave for widgets under mouse.
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(!popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 0);
    QCOMPARE(popupWidget.leaves, 0);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 1);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 1);
    topLevelWidget.resetCounts();
    childWidget2.resetCounts();

    // Moving around while popup active should not change undermouse or cause
    // enter and leave events for widgets.
    QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(child2PointB)));
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(!popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 0);
    QCOMPARE(popupWidget.leaves, 0);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 0);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 0);

    QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(inWindowPoint)));
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(!popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 0);
    QCOMPARE(popupWidget.leaves, 0);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 0);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 0);

    QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(child1Point)));
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(!popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 0);
    QCOMPARE(popupWidget.leaves, 0);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 0);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 0);

    // Note: Mouse moving off-application while there is an active popup cannot be simulated
    // without actually moving the cursor so it is not tested.

    // Mouse enters popup, should cause enter to popup.
    // Once again, need to create artificial enter event.
    const QPoint popupCenter = popupWindow->geometry().center();
    QWindowSystemInterface::handleEnterEvent(popupWindow, popupWindow->mapFromGlobal(popupCenter), popupCenter);
    QTest::mouseMove(popupWindow, popupCenter);
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 1);
    QCOMPARE(popupWidget.leaves, 0);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 0);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 0);
    popupWidget.resetCounts();

    // Mouse moves around inside popup, no changes
    QTest::mouseMove(popupWindow, QPoint(5, 5));
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 0);
    QCOMPARE(popupWidget.leaves, 0);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 0);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 0);

    // Mouse leaves popup and enters topLevelWidget, should cause leave for popup
    // but no enter to topLevelWidget.
    QTest::mouseMove(popupWindow, popupWindow->mapFromGlobal(window->mapToGlobal(inWindowPoint)));
    QApplication::processEvents();
    QVERIFY(!topLevelWidget.underMouse());
    QVERIFY(!childWidget1.underMouse());
    QVERIFY(!childWidget2.underMouse());
    QVERIFY(!popupWidget.underMouse());
    QCOMPARE(popupWidget.enters, 0);
    QCOMPARE(popupWidget.leaves, 1);
    QCOMPARE(topLevelWidget.enters, 0);
    QCOMPARE(topLevelWidget.leaves, 0);
    QCOMPARE(childWidget1.enters, 0);
    QCOMPARE(childWidget1.leaves, 0);
    QCOMPARE(childWidget2.enters, 0);
    QCOMPARE(childWidget2.leaves, 0);
}

class EnterTestModalDialog : public QDialog
{
    Q_OBJECT
public:
    EnterTestModalDialog()
    {
        setGeometry(100, 300, 150, 100);
        button = new QPushButton(this);
        button->setGeometry(10, 10, 50, 30);
    }

    QPushButton *button;
};

class EnterTestMainDialog : public QDialog
{
    Q_OBJECT
public:

public slots:
    void buttonPressed()
    {
        qApp->installEventFilter(this);
        modal = new EnterTestModalDialog();
        QTimer::singleShot(2000, modal, SLOT(close())); // Failsafe
        QTimer::singleShot(100, this, SLOT(doMouseMoves()));
        modal->exec();
        delete modal;
        modal = nullptr;
    }

    void doMouseMoves()
    {
        QPoint point1(15, 15);
        QPoint point2(15, 20);
        QPoint point3(20, 20);
        QWindow *window = modal->windowHandle();
        const QPoint nativePoint1 = QHighDpi::toNativePixels(point1, window->screen());
        QWindowSystemInterface::handleEnterEvent(window, nativePoint1);
        QTest::mouseMove(window, point1);
        QTest::mouseMove(window, point2);
        QTest::mouseMove(window, point3);
        modal->close();
    }

    bool eventFilter(QObject *o, QEvent *e) override
    {
        switch (e->type()) {
        case QEvent::Enter:
            if (modal && modal->button && o == modal->button)
                enters++;
            break;
        default:
            break;
        }
        return QDialog::eventFilter(o, e);
    }

public:
    EnterTestModalDialog *modal = nullptr;
    int enters = 0;
};

// A modal dialog launched by clicking a button should not trigger excess enter events
// when mousing over it.
void tst_QWidget::taskQTBUG_27643_enterEvents()
{
    // Move the mouse cursor to a safe location so it won't interfere
    QCursor::setPos(m_safeCursorPos);

    EnterTestMainDialog dialog;
    dialog.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QPushButton button(&dialog);

    connect(&button, &QAbstractButton::clicked, &dialog, &EnterTestMainDialog::buttonPressed);

    dialog.setGeometry(100, 100, 150, 100);
    button.setGeometry(10, 10, 100, 50);
    dialog.show();
    QVERIFY(QTest::qWaitForWindowExposed(&dialog));

    QWindow *window = dialog.windowHandle();
    QPoint overButton(25, 25);

    QWindowSystemInterface::handleEnterEvent(window, overButton, window->mapToGlobal(overButton));
    QTest::mouseMove(window, overButton);
    QTest::mouseClick(window, Qt::LeftButton, Qt::KeyboardModifiers(), overButton, 0);

    // Modal dialog opened in EnterTestMainDialog::buttonPressed()...

    // Must only register only single enter on modal dialog's button after all said and done
    QCOMPARE(dialog.enters, 1);
}
#endif // QT_NO_CURSOR

class KeyboardWidget : public QWidget
{
public:
    using QWidget::QWidget;
    void mousePressEvent(QMouseEvent* ev) override
    {
        m_modifiers = ev->modifiers();
        m_appModifiers = QApplication::keyboardModifiers();
        ++m_eventCounter;
    }
    Qt::KeyboardModifiers m_modifiers;
    Qt::KeyboardModifiers m_appModifiers;
    int m_eventCounter = 0;
};

void tst_QWidget::keyboardModifiers()
{
    KeyboardWidget w;
    w.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    w.resize(300, 300);
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    QTest::mouseClick(&w, Qt::LeftButton, Qt::ControlModifier);
    QCOMPARE(w.m_eventCounter, 1);
    QCOMPARE(int(w.m_modifiers), int(Qt::ControlModifier));
    QCOMPARE(int(w.m_appModifiers), int(Qt::ControlModifier));
}

class DClickWidget : public QWidget
{
public:
    void mouseDoubleClickEvent(QMouseEvent *) override
    {
        triggered = true;
    }
    bool triggered = false;
};

void tst_QWidget::mouseDoubleClickBubbling_QTBUG29680()
{
    DClickWidget parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QWidget child(&parent);
    parent.resize(200, 200);
    child.resize(200, 200);
    parent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));

    QTest::mouseDClick(&child, Qt::LeftButton);

    QTRY_VERIFY(parent.triggered);
}

void tst_QWidget::largerThanScreen_QTBUG30142()
{
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.resize(200, 4000);
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QVERIFY2(widget.frameGeometry().y() >= 0,
             msgComparisonFailed(widget.frameGeometry().y(), " >=", 0));

    QWidget widget2;
    widget2.resize(10000, 400);
    widget2.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget2));
    QVERIFY2(widget2.frameGeometry().x() >= 0,
             msgComparisonFailed(widget.frameGeometry().x(), " >=", 0));
}

void tst_QWidget::resizeStaticContentsChildWidget_QTBUG35282()
{
    QWidget widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.resize(200,200);

    UpdateWidget childWidget(&widget);
    childWidget.setPalette(simplePalette());
    childWidget.setAttribute(Qt::WA_StaticContents);
    childWidget.setAttribute(Qt::WA_OpaquePaintEvent);
    childWidget.setGeometry(250, 250, 500, 500);

    widget.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QCOMPARE(childWidget.numPaintEvents, 0);
    childWidget.reset();

    widget.resize(1000,1000);
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QGuiApplication::sync();
    QVERIFY2(childWidget.numPaintEvents >= 1,
             msgComparisonFailed(childWidget.numPaintEvents, ">=", 1));
}

void tst_QWidget::qmlSetParentHelper()
{
#ifdef QT_BUILD_INTERNAL
    QWidget parent;
    parent.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    QWidget child;
    QVERIFY(QAbstractDeclarativeData::setWidgetParent);
    QAbstractDeclarativeData::setWidgetParent(&child, &parent);
    QCOMPARE(child.parentWidget(), &parent);
    QAbstractDeclarativeData::setWidgetParent(&child, nullptr);
    QVERIFY(!child.parentWidget());
#else
    QSKIP("Needs QT_BUILD_INTERNAL");
#endif
}

void tst_QWidget::testForOutsideWSRangeFlag()
{
    QSKIP("Test assumes QWindows can have 0x0 size, see QTBUG-61953");

    // QTBUG-49445
    {
        QWidget widget;
        widget.resize(0, 0);
        widget.show();
        QTest::qWait(100); // Wait for a while...
        QVERIFY(!widget.windowHandle()->isExposed()); // The window should not be visible
        QVERIFY(widget.isVisible()); // The widget should be in visible state
    }
    {
        QWidget widget;

        QWidget native(&widget);
        native.setAttribute(Qt::WA_NativeWindow);
        native.resize(0, 0);

        widget.show();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QVERIFY(!native.windowHandle()->isExposed());
    }
    {
        QWidget widget;
        QWidget native(&widget);

        widget.show();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QVERIFY(native.isVisible());

        native.resize(0, 0);
        native.setAttribute(Qt::WA_NativeWindow);
        QTest::qWait(100); // Wait for a while...
        QVERIFY(!native.windowHandle()->isExposed());
    }

    // QTBUG-48321
    {
        QWidget widget;

        QWidget native(&widget);
        native.setAttribute(Qt::WA_NativeWindow);

        widget.show();
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
        QVERIFY(native.windowHandle()->isExposed());

        native.resize(0, 0);
        QTest::qWait(100); // Wait for a while...
        QVERIFY(!native.windowHandle()->isExposed());
    }

    // QTBUG-51788
    {
        QWidget widget;
        widget.setLayout(new QGridLayout);
        widget.layout()->addWidget(new QLineEdit);
        widget.resize(0, 0);
        widget.show();
        // The layout should change the size, so the widget must be visible!
        QVERIFY(QTest::qWaitForWindowExposed(&widget));
    }
}

void tst_QWidget::tabletTracking()
{
    class TabletWidget : public QWidget
    {
    public:
        using QWidget::QWidget;

        int tabletEventCount = 0;
        int pressEventCount = 0;
        int moveEventCount = 0;
        int releaseEventCount = 0;
        int trackingChangeEventCount = 0;
        qint64 uid = -1;

    protected:
        void tabletEvent(QTabletEvent *event) override {
            ++tabletEventCount;
            uid = event->pointingDevice()->uniqueId().numericId();
            switch (event->type()) {
            case QEvent::TabletMove:
                ++moveEventCount;
                break;
            case QEvent::TabletPress:
                ++pressEventCount;
                break;
            case QEvent::TabletRelease:
                ++releaseEventCount;
                break;
            default:
                break;
            }
        }

        bool event(QEvent *ev) override {
            if (ev->type() == QEvent::TabletTrackingChange)
                ++trackingChangeEventCount;
            return QWidget::event(ev);
        }
    } widget;
    widget.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
    widget.resize(200,200);
    widget.showNormal();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    widget.setAttribute(Qt::WA_TabletTracking);
    QTRY_COMPARE(widget.trackingChangeEventCount, 1);
    QVERIFY(widget.hasTabletTracking());

    QWindow *window = widget.windowHandle();
    QPointF local(10, 10);
    QPointF global = window->mapToGlobal(local.toPoint());
    QPointF deviceLocal = QHighDpi::toNativeLocalPosition(local, window);
    QPointF deviceGlobal = QHighDpi::toNativePixels(global, window->screen());
    qint64 uid = 1234UL;

    QWindowSystemInterface::handleTabletEvent(window, ulong(QDateTime::currentMSecsSinceEpoch()), deviceLocal, deviceGlobal,
        int(QInputDevice::DeviceType::Stylus), int(QPointingDevice::PointerType::Pen), Qt::NoButton, 0, 0, 0, 0, 0, 0, uid, Qt::NoModifier);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.moveEventCount, 1);
    QCOMPARE(widget.uid, uid);

    local += QPoint(10, 10);
    deviceLocal += QPoint(10, 10);
    deviceGlobal += QPoint(10, 10);
    QWindowSystemInterface::handleTabletEvent(window, ulong(QDateTime::currentMSecsSinceEpoch()), deviceLocal, deviceGlobal,
        int(QInputDevice::DeviceType::Stylus), int(QPointingDevice::PointerType::Pen), Qt::NoButton, 0, 0, 0, 0, 0, 0, uid, Qt::NoModifier);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.moveEventCount, 2);

    widget.setTabletTracking(false);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.trackingChangeEventCount, 2);

    QWindowSystemInterface::handleTabletEvent(window, ulong(QDateTime::currentMSecsSinceEpoch()), deviceLocal, deviceGlobal,
        int(QInputDevice::DeviceType::Stylus), int(QPointingDevice::PointerType::Pen), Qt::LeftButton, 0, 0, 0, 0, 0, 0, uid, Qt::NoModifier);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.pressEventCount, 1);

    local += QPoint(10, 10);
    deviceLocal += QPoint(10, 10);
    deviceGlobal += QPoint(10, 10);
    QWindowSystemInterface::handleTabletEvent(window, ulong(QDateTime::currentMSecsSinceEpoch()), deviceLocal, deviceGlobal,
        int(QInputDevice::DeviceType::Stylus), int(QPointingDevice::PointerType::Pen), Qt::LeftButton, 0, 0, 0, 0, 0, 0, uid, Qt::NoModifier);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.moveEventCount, 3);

    QWindowSystemInterface::handleTabletEvent(window, ulong(QDateTime::currentMSecsSinceEpoch()), deviceLocal, deviceGlobal,
        int(QInputDevice::DeviceType::Stylus), int(QPointingDevice::PointerType::Pen), Qt::NoButton, 0, 0, 0, 0, 0, 0, uid, Qt::NoModifier);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.releaseEventCount, 1);

    local += QPoint(10, 10);
    deviceLocal += QPoint(10, 10);
    deviceGlobal += QPoint(10, 10);
    QWindowSystemInterface::handleTabletEvent(window, ulong(QDateTime::currentMSecsSinceEpoch()), deviceLocal, deviceGlobal,
                                              int(QInputDevice::DeviceType::Stylus), int(QPointingDevice::PointerType::Pen), Qt::NoButton, 0, 0, 0, 0, 0, 0, uid, Qt::NoModifier);
    QCoreApplication::processEvents();
    QTRY_COMPARE(widget.moveEventCount, 3);
}

class CloseCountingWidget : public QWidget
{
public:
    int closeCount = 0;
    void closeEvent(QCloseEvent *ev) override;
};

void CloseCountingWidget::closeEvent(QCloseEvent *ev)
{
    ++closeCount;
    ev->accept();
}

void tst_QWidget::closeEvent()
{
    CloseCountingWidget widget;
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    // Yes we call the close() function twice. This mimics the behavior of QTBUG-43344 where
    // QApplication first closes all windows and then QCocoaApplication flushes window system
    // events, triggering more close events.
    widget.windowHandle()->close();
    widget.windowHandle()->close();
    QCOMPARE(widget.closeCount, 1);

    CloseCountingWidget widget2;
    widget2.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget2));
    widget2.close();
    widget2.close();
    QCOMPARE(widget2.closeCount, 1);
    widget2.closeCount = 0;

    widget2.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget2));
    widget2.close();
    QCOMPARE(widget2.closeCount, 1);

    CloseCountingWidget widget3;
    widget3.close();
    widget3.close();
    QEXPECT_FAIL("", "Closing a widget without a window will unconditionally send close events", Continue);
    QCOMPARE(widget3.closeCount, 0);

    QWidget parent;
    CloseCountingWidget child;
    child.setParent(&parent);
    parent.show();
    QVERIFY(QTest::qWaitForWindowExposed(&parent));
    child.close();
    QCOMPARE(child.closeCount, 1);
    child.close();
    QEXPECT_FAIL("", "Closing a widget without a window will unconditionally send close events", Continue);
    QCOMPARE(child.closeCount, 1);
}

void tst_QWidget::closeWithChildWindow()
{
    QWidget widget;
    auto childWidget = new QWidget(&widget);
    childWidget->setAttribute(Qt::WA_NativeWindow);
    childWidget->windowHandle()->create();
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    widget.windowHandle()->close();
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    // Check that the child window inside the window is now visible
    QVERIFY(childWidget->isVisible());

    // Now explicitly hide the childWidget
    childWidget->hide();
    widget.windowHandle()->close();
    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));
    QVERIFY(!childWidget->isVisible());
}

class WinIdChangeSpy : public QObject
{
    Q_OBJECT
public:
    QWidget *widget = nullptr;
    WId winId = 0;
    explicit WinIdChangeSpy(QWidget *w, QObject *parent = nullptr)
        : QObject(parent)
        , widget(w)
        , winId(widget->winId())
    {
    }

public slots:
    bool eventFilter(QObject *obj, QEvent *event) override
    {
        if (obj == widget) {
            if (event->type() == QEvent::WinIdChange) {
                winId = widget->winId();
                return true;
            }
        }
        return false;
    }
};

void tst_QWidget::winIdAfterClose()
{
    auto widget = new QWidget;
    auto notifier = new QObject(widget);
    auto deleteWidget = new QWidget(new QWidget(widget));
    auto spy = new WinIdChangeSpy(deleteWidget);
    deleteWidget->installEventFilter(spy);
    connect(notifier, &QObject::destroyed, [&] { delete deleteWidget; });

    widget->setAttribute(Qt::WA_NativeWindow);
    widget->windowHandle()->create();
    widget->show();

    QVERIFY(QTest::qWaitForWindowExposed(widget));
    QVERIFY(spy->winId);

    widget->windowHandle()->close();
    delete widget;

    QCOMPARE(spy->winId, WId(0));
    delete spy;
}

class ChangeEventWidget : public QWidget
{
public:
    ChangeEventWidget(QWidget *parent = nullptr) : QWidget(parent) {}
    int languageChangeCount = 0;
    int applicationFontChangeCount = 0;
    int applicationPaletteChangeCount = 0;
protected:
    bool event(QEvent *e) override
    {
        if (e->type() == QEvent::LanguageChange)
            languageChangeCount++;
        else if (e->type() == QEvent::ApplicationFontChange)
            applicationFontChangeCount++;
        else if (e->type() == QEvent::ApplicationPaletteChange)
            applicationPaletteChangeCount++;
        return QWidget::event(e);
    }
};

class ChangeEventWindow : public QWindow
{
public:
    ChangeEventWindow(QWindow *parent = nullptr) : QWindow(parent) {}
    int languageChangeCount = 0;
    int applicationFontChangeCount = 0;
    int applicationPaletteChangeCount = 0;
protected:
    bool event(QEvent *e) override
    {
        if (e->type() == QEvent::LanguageChange)
            languageChangeCount++;
        else if (e->type() == QEvent::ApplicationFontChange)
            applicationFontChangeCount++;
        else if (e->type() == QEvent::ApplicationPaletteChange)
            applicationPaletteChangeCount++;
        return QWindow::event(e);
    }
};

void tst_QWidget::receivesLanguageChangeEvent()
{
    // Confirm that any QWindow or QWidget only gets a single
    // LanguageChange event when a translator is installed
    ChangeEventWidget topLevel;
    auto childWidget = new ChangeEventWidget(&topLevel);
    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    ChangeEventWindow ww;
    ww.show();
    QVERIFY(QTest::qWaitForWindowExposed(&ww));
    ChangeEventWidget topLevelNotShown;
    QTranslator t;
    QVERIFY(t.load("hellotr_la.qm", ":/"));
    QVERIFY(qApp->installTranslator(&t));
    QCoreApplication::sendPostedEvents(0, QEvent::LanguageChange);
    QCOMPARE(topLevel.languageChangeCount, 1);
    QCOMPARE(topLevelNotShown.languageChangeCount, 1);
    QCOMPARE(childWidget->languageChangeCount, 1);
    QCOMPARE(ww.languageChangeCount, 1);
}

void tst_QWidget::receivesApplicationFontChangeEvent()
{
    // Confirm that any QWindow or top level QWidget only gets a single
    // ApplicationFontChange event when the font is changed
    const QFont origFont = QApplication::font();

    ChangeEventWidget topLevel;
    auto childWidget = new ChangeEventWidget(&topLevel);
    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    ChangeEventWindow ww;
    ww.show();
    QVERIFY(QTest::qWaitForWindowExposed(&ww));
    ChangeEventWidget topLevelNotShown;
    QFont changedFont = origFont;
    changedFont.setPointSize(changedFont.pointSize() + 2);
    QApplication::setFont(changedFont);
    QCoreApplication::sendPostedEvents(0, QEvent::ApplicationFontChange);
    QCOMPARE(topLevel.applicationFontChangeCount, 1);
    QCOMPARE(topLevelNotShown.applicationFontChangeCount, 1);
    // QWidget should not be passing the event on automatically
    QCOMPARE(childWidget->applicationFontChangeCount, 0);
    QCOMPARE(ww.applicationFontChangeCount, 1);

    QApplication::setFont(origFont);
}

void tst_QWidget::receivesApplicationPaletteChangeEvent()
{
    // Confirm that any QWindow or top level QWidget only gets a single
    // ApplicationPaletteChange event when the font is changed
    const QPalette origPalette = QApplication::palette();

    ChangeEventWidget topLevel;
    auto childWidget = new ChangeEventWidget(&topLevel);
    topLevel.show();
    QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
    ChangeEventWindow ww;
    ww.show();
    QVERIFY(QTest::qWaitForWindowExposed(&ww));
    ChangeEventWidget topLevelNotShown;
    QPalette changedPalette = origPalette;
    changedPalette.setColor(QPalette::Base, Qt::red);
    QApplication::setPalette(changedPalette);
    QCoreApplication::sendPostedEvents(0, QEvent::ApplicationPaletteChange);
    QCOMPARE(topLevel.applicationPaletteChangeCount, 1);
    QCOMPARE(topLevelNotShown.applicationPaletteChangeCount, 1);
    // QWidget should not be passing the event on automatically
    QCOMPARE(childWidget->applicationPaletteChangeCount, 0);
    QCOMPARE(ww.applicationPaletteChangeCount, 1);

    QApplication::setPalette(origPalette);
}

class DeleteOnCloseEventWidget : public QWidget
{
protected:
    virtual void closeEvent(QCloseEvent *e) override
    {
        e->accept();
        delete this;
    }
};

void tst_QWidget::deleteWindowInCloseEvent()
{
#ifdef Q_OS_ANDROID
    QSKIP("This test crashes on Android");
#endif
    QSignalSpy quitSpy(qApp, &QGuiApplication::lastWindowClosed);

    // Closing this widget should not cause a crash
    auto widget = new DeleteOnCloseEventWidget;
    widget->show();
    QVERIFY(QTest::qWaitForWindowExposed(widget));
    QTimer::singleShot(0, widget, [&]{
        widget->close();
    });
    QApplication::exec();

    // It should still result in a single lastWindowClosed emit
    QCOMPARE(quitSpy.size(), 1);
}

/*!
    Verify that both closing and deleting the last (only) window-widget
    exits the application event loop.
*/
void tst_QWidget::quitOnClose()
{
    QSignalSpy quitSpy(qApp, &QGuiApplication::lastWindowClosed);

    std::unique_ptr<QWidget>widget(new QWidget);
    widget->show();
    QVERIFY(QTest::qWaitForWindowExposed(widget.get()));

    // QGuiApplication::lastWindowClosed is documented to only be emitted
    // when we are in exec()
    QTimer::singleShot(0, widget.get(), [&]{
        widget->close();
    });
    QApplication::exec();
    QCOMPARE(quitSpy.size(), 1);

    widget->show();
    QVERIFY(QTest::qWaitForWindowExposed(widget.get()));
    QTimer::singleShot(0, widget.get(), [&]{
        widget.reset();
    });
    QApplication::exec();
    QCOMPARE(quitSpy.size(), 2);
}

void tst_QWidget::setParentChangesFocus_data()
{
    QTest::addColumn<Qt::WindowType>("initialType");
    QTest::addColumn<bool>("initialParent");
    QTest::addColumn<Qt::WindowType>("targetType");
    QTest::addColumn<bool>("targetParent");
    QTest::addColumn<bool>("reparentBeforeShow");
    QTest::addColumn<QString>("focusWidget");

    for (const bool before : {true, false}) {
        const char *tag = before ? "before" : "after";
        QTest::addRow("give dialog parent, %s", tag)
            << Qt::Dialog << false << Qt::Dialog << true << before << "lineEdit";
        QTest::addRow("make dialog parentless, %s", tag)
            << Qt::Dialog << true << Qt::Dialog << false << before << "lineEdit";
        QTest::addRow("dialog to sheet, %s", tag)
            << Qt::Dialog << true << Qt::Sheet << true << before << "lineEdit";
        QTest::addRow("window to widget, %s", tag)
            << Qt::Window << true << Qt::Widget << true << before << "windowEdit";
        QTest::addRow("widget to window, %s", tag)
            << Qt::Widget << true << Qt::Window << true << before << "lineEdit";
    }
}

void tst_QWidget::setParentChangesFocus()
{
    QFETCH(Qt::WindowType, initialType);
    QFETCH(bool, initialParent);
    QFETCH(Qt::WindowType, targetType);
    QFETCH(bool, targetParent);
    QFETCH(bool, reparentBeforeShow);
    QFETCH(QString, focusWidget);

    QWidget window;
    window.setObjectName("window");
    QLineEdit *windowEdit = new QLineEdit(&window);
    windowEdit->setObjectName("windowEdit");
    windowEdit->setFocus();

    std::unique_ptr<QWidget> secondary(new QWidget(initialParent ? &window : nullptr, initialType));
    secondary->setObjectName("secondary");
    QLineEdit *lineEdit = new QLineEdit(secondary.get());
    lineEdit->setObjectName("lineEdit");
    QPushButton *pushButton = new QPushButton(secondary.get());
    pushButton->setObjectName("pushButton");
    lineEdit->setFocus();

    window.show();
    QVERIFY(QTest::qWaitForWindowActive(&window));

    if (reparentBeforeShow) {
        secondary->setParent(targetParent ? &window : nullptr, targetType);
        // making a widget into a window doesn't set a focusWidget until shown
        if (secondary->focusWidget())
            QCOMPARE(secondary->focusWidget()->objectName(), focusWidget);
    }
    secondary->show();
    QApplicationPrivate::setActiveWindow(secondary.get());
    QVERIFY(QTest::qWaitForWindowActive(secondary.get()));

    if (!reparentBeforeShow) {
        secondary->setParent(targetParent ? &window : nullptr, targetType);
        secondary->show(); // reparenting hides, so show again
        QApplicationPrivate::setActiveWindow(secondary.get());
        QVERIFY(QTest::qWaitForWindowActive(secondary.get()));
    }
    QCOMPARE(QApplication::focusWidget()->objectName(), focusWidget);
}

void tst_QWidget::activateWhileModalHidden()
{
    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::WindowActivation))
        QSKIP("QWindow::requestActivate() is not supported.");

    QDialog dialog;
    dialog.setWindowModality(Qt::ApplicationModal);
    dialog.show();
    QVERIFY(QTest::qWaitForWindowActive(&dialog));
    QVERIFY(dialog.isActiveWindow());
    QCOMPARE(QApplication::activeWindow(), &dialog);

    dialog.hide();
    QTRY_VERIFY(!dialog.isVisible());

    QMainWindow window;
    window.show();
    QVERIFY(QTest::qWaitForWindowActive(&window));
    QVERIFY(window.isActiveWindow());
    QCOMPARE(QApplication::activeWindow(), &window);
}

// Create a simple palette to prevent multiple paint events
QPalette tst_QWidget::simplePalette()
{
    static QPalette simplePalette = []{
        const QColor windowText = Qt::black;
        const QColor backGround = QColor(239, 239, 239);
        const QColor light = backGround.lighter(150);
        const QColor mid = (backGround.darker(130));
        const QColor midLight = mid.lighter(110);
        const QColor base = Qt::white;
        const QColor dark = backGround.darker(150);
        const QColor text = Qt::black;
        const QColor highlight = QColor(48, 140, 198);
        const QColor hightlightedText = Qt::white;
        const QColor button = backGround;
        const QColor shadow = dark.darker(135);

        QPalette defaultPalette(windowText, backGround, light, dark, mid, text, base);
        defaultPalette.setBrush(QPalette::Midlight, midLight);
        defaultPalette.setBrush(QPalette::Button, button);
        defaultPalette.setBrush(QPalette::Shadow, shadow);
        defaultPalette.setBrush(QPalette::HighlightedText, hightlightedText);
        defaultPalette.setBrush(QPalette::Active, QPalette::Highlight, highlight);
        return defaultPalette;
    }();

    return simplePalette;
}

#ifdef Q_OS_ANDROID
void tst_QWidget::showFullscreenAndroid()
{
    QWidget w;
    w.setAutoFillBackground(true);
    QPalette p = w.palette();
    p.setColor(QPalette::Window, Qt::red);
    w.setPalette(p);

    // Need to toggle showFullScreen() twice, see QTBUG-101968
    w.showFullScreen();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    w.show();
    QVERIFY(QTest::qWaitForWindowExposed(&w));
    w.showFullScreen();
    QVERIFY(QTest::qWaitForWindowExposed(&w));

    // Make sure that the lower part of the screen contains the red widget, not
    // the buttons.

    const QRect fullGeometry = w.screen()->geometry();
    // Take a rect of (20 x 20) from the bottom area
    const QRect grabArea(10, fullGeometry.height() - 30, 20, 20);
    const QImage img = grabFromWidget(&w, grabArea).toImage().convertedTo(QImage::Format_RGB32);

    QPixmap expectedPix(20, 20);
    expectedPix.fill(Qt::red);
    const QImage expectedImg = expectedPix.toImage().convertedTo(QImage::Format_RGB32);

    QCOMPARE(img, expectedImg);
}
#endif // Q_OS_ANDROID

void tst_QWidget::explicitShowHide()
{
    {
        QWidget parent;
        parent.setObjectName("Parent");
        QWidget child(&parent);
        child.setObjectName("Child");

        QCOMPARE(parent.testAttribute(Qt::WA_WState_ExplicitShowHide), false);
        QCOMPARE(parent.testAttribute(Qt::WA_WState_Hidden), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), false);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);

        parent.show();
        QCOMPARE(parent.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(parent.testAttribute(Qt::WA_WState_Hidden), false);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), false);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);

        // Fix up earlier expected failure
        child.setAttribute(Qt::WA_WState_ExplicitShowHide, false);

        parent.hide();
        QCOMPARE(parent.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(parent.testAttribute(Qt::WA_WState_Hidden), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), false);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);
    }

    {
        // Test what happens when a child is reparented after showing it

        QWidget parent;
        parent.setObjectName("Parent");
        QWidget child;
        child.setObjectName("Child");

        child.show();
        QCOMPARE(child.isVisible(), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);

        child.setParent(&parent);
        // As documented, a widget becomes invisible as part of changing
        // its parent, even if it was previously visible. The user must call
        // show() to make the widget visible again.
        QCOMPARE(child.isVisible(), false);

        // However, the widget does not end up with Qt::WA_WState_Hidden,
        // as QWidget::setParent treats it as a child, which normally will
        // not get Qt::WA_WState_Hidden out of the box.
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);

        // For some reason we reset WA_WState_ExplicitShowHide, and it's
        // not clear whether this is correct or not See QWidget::setParent()
        // for a comment with more details.
        QEXPECT_FAIL("", "We reset WA_WState_ExplicitShowHide on widget re-parent", Continue);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), true);

        // The fact that the child doesn't have Qt::WA_WState_Hidden means
        // it's sufficient to show the parent widget. We don't need to
        // explicitly show the child.
        parent.show();
        QCOMPARE(child.isVisible(), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);
    }

    {
        QWidget parent;
        parent.setObjectName("Parent");
        QWidget child(&parent);
        child.setObjectName("Child");

        parent.show();

        // If a non-native child ends up being closed, we will hide the
        // widget, but do so via QWidget::hide(), which marks the widget
        // as explicitly hidden.

        child.setAttribute(Qt::WA_WState_ExplicitShowHide, false);
        QCOMPARE(child.close(), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), true);

        child.show();
        child.setAttribute(Qt::WA_NativeWindow);
        child.setAttribute(Qt::WA_WState_ExplicitShowHide, false);
        QCOMPARE(child.close(), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), true);

        child.show();
        child.setAttribute(Qt::WA_WState_ExplicitShowHide, false);
        QCOMPARE(child.windowHandle()->close(), false); // Can't close non-top level QWindows
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), false);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), false);

        // If we end up in QWidgetPrivate::handleClose via QWidgetWindow::closeEvent,
        // either through QWindow::close(), or via QWSI::handleCloseEvent, we'll still
        // do the explicit hide.

        child.show();
        child.setAttribute(Qt::WA_WState_ExplicitShowHide, false);
        QCOMPARE(QWindowSystemInterface::handleCloseEvent<QWindowSystemInterface::SynchronousDelivery>(
            child.windowHandle()), true);
        QEXPECT_FAIL("", "Closing a native child via QWSI is treated as an explicit hide", Continue);
        QCOMPARE(child.testAttribute(Qt::WA_WState_ExplicitShowHide), false);
        QCOMPARE(child.testAttribute(Qt::WA_WState_Hidden), true);
    }

    {
        QWidget widget;
        widget.show();
        widget.hide();

        QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), false);
        QCOMPARE(widget.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(widget.testAttribute(Qt::WA_WState_Hidden), true);

        // The widget is now explicitly hidden. Showing it again, via QWindow,
        // should make the widget visible, and it should not stay hidden, as
        // that's an invalid state for a widget.

        widget.windowHandle()->setVisible(true);
        QCOMPARE(widget.testAttribute(Qt::WA_WState_Visible), true);
        QCOMPARE(widget.testAttribute(Qt::WA_WState_ExplicitShowHide), true);
        QCOMPARE(widget.testAttribute(Qt::WA_WState_Hidden), false);
    }
}

/*!
    Verify that we deliver DragEnter/Leave events symmetrically, even if the
    widget entered didn't accept the DragEnter event.
*/
void tst_QWidget::dragEnterLeaveSymmetry()
{
    QWidget widget;
    widget.setAcceptDrops(true);
    QLineEdit lineEdit;
    QLabel label("Hello world");
    label.setAcceptDrops(true);

    struct EventFilter : QObject
    {
        bool eventFilter(QObject *receiver, QEvent *event) override
        {
            switch (event->type()) {
            case QEvent::DragEnter:
            case QEvent::DragLeave:
                receivers[event->type()] << receiver;
                break;

            default:
                break;
            }

            return false;
        }

        QMap<QEvent::Type, QList<QObject *>> receivers;

        void clear() { receivers.clear(); }
        bool hasEntered(QWidget *widget) const
        {
            return receivers.value(QEvent::DragEnter).contains(widget);
        }
        bool hasLeft(QWidget *widget) const
        {
            return receivers.value(QEvent::DragLeave).contains(widget);
        }
    } filter;

    widget.installEventFilter(&filter);
    lineEdit.installEventFilter(&filter);
    label.installEventFilter(&filter);

    QVBoxLayout vbox;
    vbox.setContentsMargins(10, 10, 10, 10);
    vbox.addWidget(&lineEdit);
    vbox.addWidget(&label);
    widget.setLayout(&vbox);

    widget.show();
    QVERIFY(QTest::qWaitForWindowExposed(&widget));

    QMimeData data;
    data.setColorData(QVariant::fromValue(Qt::red));
    QWindowSystemInterface::handleDrag(widget.windowHandle(), &data, QPoint(1, 1),
                                       Qt::ActionMask, Qt::LeftButton, {});
    QVERIFY(filter.hasEntered(&widget));
    QVERIFY(!filter.hasEntered(&lineEdit));
    QVERIFY(!filter.hasEntered(&label));
    QVERIFY(widget.underMouse());
    QVERIFY(!lineEdit.underMouse());
    filter.clear();

    QWindowSystemInterface::handleDrag(widget.windowHandle(), &data, lineEdit.geometry().center(),
                                       Qt::ActionMask, Qt::LeftButton, {});
    // DragEnter propagates as the lineEdit doesn't want it, so the widget
    // sees both a Leave and an Enter event
    QVERIFY(filter.hasLeft(&widget));
    QVERIFY(filter.hasEntered(&widget));
    QVERIFY(filter.hasEntered(&widget));
    // both have the UnderMouse attribute set
    QVERIFY(lineEdit.underMouse());
    QVERIFY(widget.underMouse());

    // The lineEdit didn't accept the DragEnter, but it should still has to
    // get the DragLeave so that UnderMouse is cleared; the widget gets both
    // Leave and Enter through propagation.
    QWindowSystemInterface::handleDrag(widget.windowHandle(), &data, label.geometry().center(),
                                       Qt::ActionMask, Qt::LeftButton, {});
    QVERIFY(filter.hasLeft(&lineEdit));
    QVERIFY(filter.hasLeft(&widget));
    QVERIFY(filter.hasEntered(&label));
    QVERIFY(filter.hasEntered(&widget));

    QVERIFY(!lineEdit.underMouse());
    QVERIFY(label.underMouse());
    QVERIFY(widget.underMouse());
}

void tst_QWidget::setVisibleDuringDestruction()
{
    CreateDestroyWidget widget;
    widget.create();
    QVERIFY(widget.windowHandle());

    QSignalSpy signalSpy(widget.windowHandle(), &QWindow::visibleChanged);
    EventSpy<QWindow> showEventSpy(widget.windowHandle(), QEvent::Show);
    widget.show();
    QTRY_COMPARE(showEventSpy.count(), 1);
    QTRY_COMPARE(signalSpy.count(), 1);

    EventSpy<QWindow> hideEventSpy(widget.windowHandle(), QEvent::Hide);
    widget.hide();
    QTRY_COMPARE(hideEventSpy.count(), 1);
    QTRY_COMPARE(signalSpy.count(), 2);

    widget.show();
    QTRY_COMPARE(showEventSpy.count(), 2);
    QTRY_COMPARE(signalSpy.count(), 3);

    widget.destroy();
    QTRY_COMPARE(hideEventSpy.count(), 2);
    QTRY_COMPARE(signalSpy.count(), 4);
}

void tst_QWidget::reparentWindowHandles_data()
{
    QTest::addColumn<int>("stage");
    QTest::addRow("reparent child") << 1;
    QTest::addRow("top level to child") << 2;
    QTest::addRow("transient parent") << 3;
    QTest::addRow("window container") << 4;
}

void tst_QWidget::reparentWindowHandles()
{
    const bool nativeSiblingsOriginal = qApp->testAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
    qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings, true);
    auto nativeSiblingGuard = qScopeGuard([&]{
        qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings, nativeSiblingsOriginal);
    });

    QFETCH(int, stage);

    switch (stage) {
    case 1: {
        // Reparent child widget

        QWidget topLevel;
        topLevel.setAttribute(Qt::WA_NativeWindow);
        QVERIFY(topLevel.windowHandle());
        QPointer<QWidget> child = new QWidget(&topLevel);
        child->setAttribute(Qt::WA_DontCreateNativeAncestors);
        child->setAttribute(Qt::WA_NativeWindow);
        QVERIFY(child->windowHandle());

        QWidget anotherTopLevel;
        anotherTopLevel.setAttribute(Qt::WA_NativeWindow);
        QVERIFY(anotherTopLevel.windowHandle());
        QPointer<QWidget> intermediate = new QWidget(&anotherTopLevel);
        QPointer<QWidget> leaf = new QWidget(intermediate);
        leaf->setAttribute(Qt::WA_DontCreateNativeAncestors);
        leaf->setAttribute(Qt::WA_NativeWindow);
        QVERIFY(leaf->windowHandle());
        QVERIFY(!intermediate->windowHandle());

        // Reparenting a native widget should reparent the QWindow
        child->setParent(leaf);
        QCOMPARE(child->windowHandle()->parent(), leaf->windowHandle());
        QCOMPARE(child->windowHandle()->transientParent(), nullptr);
        QVERIFY(!intermediate->windowHandle());

        // So should reparenting a non-native widget with native children
        intermediate->setParent(&topLevel);
        QVERIFY(!intermediate->windowHandle());
        QCOMPARE(leaf->windowHandle()->parent(), topLevel.windowHandle());
        QCOMPARE(leaf->windowHandle()->transientParent(), nullptr);
        QCOMPARE(child->windowHandle()->parent(), leaf->windowHandle());
        QCOMPARE(child->windowHandle()->transientParent(), nullptr);
    }
        break;
    case 2: {
        // Top level to child

        QWidget topLevel;
        topLevel.setAttribute(Qt::WA_NativeWindow);

        // A regular top level loses its nativeness
        QPointer<QWidget> regularToplevel = new QWidget;
        regularToplevel->show();
        QVERIFY(QTest::qWaitForWindowExposed(regularToplevel));
        QVERIFY(regularToplevel->windowHandle());
        regularToplevel->setParent(&topLevel);
        QVERIFY(!regularToplevel->windowHandle());

         // A regular top level loses its nativeness
        QPointer<QWidget> regularToplevelWithNativeChildren = new QWidget;
        QPointer<QWidget> nativeChild = new QWidget(regularToplevelWithNativeChildren);
        nativeChild->setAttribute(Qt::WA_DontCreateNativeAncestors);
        nativeChild->setAttribute(Qt::WA_NativeWindow);
        QVERIFY(nativeChild->windowHandle());
        regularToplevelWithNativeChildren->show();
        QVERIFY(QTest::qWaitForWindowExposed(regularToplevelWithNativeChildren));
        QVERIFY(regularToplevelWithNativeChildren->windowHandle());
        regularToplevelWithNativeChildren->setParent(&topLevel);
        QVERIFY(!regularToplevelWithNativeChildren->windowHandle());
        // But the native child does not
        QVERIFY(nativeChild->windowHandle());
        QCOMPARE(nativeChild->windowHandle()->parent(), topLevel.windowHandle());

        // An explicitly native top level keeps its nativeness, and the window handle moves
        QPointer<QWidget> nativeTopLevel = new QWidget;
        nativeTopLevel->setAttribute(Qt::WA_NativeWindow);
        QVERIFY(nativeTopLevel->windowHandle());
        nativeTopLevel->setParent(&topLevel);
        QVERIFY(nativeTopLevel->windowHandle());
        QCOMPARE(nativeTopLevel->windowHandle()->parent(), topLevel.windowHandle());
    }
        break;
    case 3: {
        // Transient parent

        QWidget topLevel;
        topLevel.setAttribute(Qt::WA_NativeWindow);
        QVERIFY(topLevel.windowHandle());
        QPointer<QWidget> child = new QWidget(&topLevel);
        child->setAttribute(Qt::WA_NativeWindow);
        QVERIFY(child->windowHandle());

        QWidget anotherTopLevel;
        anotherTopLevel.setAttribute(Qt::WA_NativeWindow);
        QVERIFY(anotherTopLevel.windowHandle());

        // Make transient child of top level
        anotherTopLevel.setParent(&topLevel, Qt::Window);
        QCOMPARE(anotherTopLevel.windowHandle()->parent(), nullptr);
        QCOMPARE(anotherTopLevel.windowHandle()->transientParent(), topLevel.windowHandle());

        // Make transient child of child
        anotherTopLevel.setParent(child, Qt::Window);
        QCOMPARE(anotherTopLevel.windowHandle()->parent(), nullptr);
        QCOMPARE(anotherTopLevel.windowHandle()->transientParent(), topLevel.windowHandle());
    }
        break;
    case 4: {
        // Window container

        QWidget topLevel;
        topLevel.setAttribute(Qt::WA_NativeWindow);
        QVERIFY(topLevel.windowHandle());

        QPointer<QWidget> child = new QWidget(&topLevel);
        QVERIFY(!child->windowHandle());

        QWindow *window = new QWindow;
        QWidget *container = QWidget::createWindowContainer(window);
        container->setParent(child);
        topLevel.show();
        QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
        QCOMPARE(window->parent(), topLevel.windowHandle());

        QWidget anotherTopLevel;
        anotherTopLevel.setAttribute(Qt::WA_NativeWindow);
        QVERIFY(anotherTopLevel.windowHandle());

        child->setParent(&anotherTopLevel);
        QCOMPARE(window->parent(), anotherTopLevel.windowHandle());
    }
        break;
    default:
        Q_UNREACHABLE();
    }
}

QTEST_MAIN(tst_QWidget)
#include "tst_qwidget.moc"
