index : qt/qtbase.git	5.10 5.11 5.12 5.12.5 5.12.7 5.13 5.14 5.15 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 6.1 6.2 6.2.0 6.2.4 6.3 6.4 6.4.0 6.4.1 6.4.2 6.4.3 6.5 6.5.0 6.5.1 6.5.2 6.5.3 6.6 6.6.0 6.6.1 6.6.2 6.6.3 6.7 6.7.0 6.7.1 dev old/5.0 old/5.1 old/5.2 wip/cmake wip/highdpi wip/lite wip/mir wip/nacl wip/network-test-server wip/remac wip/tizen wip/webassembly
	Qt Base (Core, Gui, Widgets, Network, ...)

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path: root/mkspecs/lynxos-g++

	Commit message (Expand)	Author	Age	Files	Lines
*	centralize definitions of shell commands	Oswald Buddenhagen	2012-06-19	1	-9/+1
*	purge QMAKE_INCDIR_QT and QMAKE_LIBDIR_QT	Oswald Buddenhagen	2012-06-19	1	-2/+0
*	Remove all references to X11 session management	Donald Carr	2012-06-01	1	-1/+0
*	remove assignment of QMAKE_MOC & QMAKE_UIC from mkspecs	Oswald Buddenhagen	2012-03-01	1	-3/+0
*	Remove "All rights reserved" line from license headers.	Jason McDonald	2012-01-30	1	-1/+1
*	Update contact information in license headers.	Jason McDonald	2012-01-23	1	-1/+1
*	Update copyright year in license headers.	Jason McDonald	2012-01-05	1	-1/+1
*	Update licenseheader text in source files for qtbase Qt module	Jyri Tahtela	2011-05-24	1	-17/+17
*	Initial import from the monolithic Qt.	Qt by Nokia	2011-04-27	2	-0/+185

generated by cgit v1.2.3 (git 2.25.1) at 2024-05-06 23:28:37 +0000

/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qquickwindow.h"
#include "qquickwindow_p.h"

#include "qquickitem.h"
#include "qquickitem_p.h"
#include "qquickevents_p_p.h"

#if QT_CONFIG(quick_draganddrop)
#include <private/qquickdrag_p.h>
#endif
#include <private/qquickhoverhandler_p.h>
#include <private/qquickpointerhandler_p.h>

#include <QtQuick/private/qsgrenderer_p.h>
#include <QtQuick/private/qsgplaintexture_p.h>
#include <private/qsgrenderloop_p.h>
#include <private/qsgrhisupport_p.h>
#include <private/qquickrendercontrol_p.h>
#include <private/qquickanimatorcontroller_p.h>
#include <private/qquickprofiler_p.h>

#include <private/qguiapplication_p.h>
#include <QtGui/QInputMethod>

#include <private/qabstractanimation_p.h>

#include <QtGui/qpainter.h>
#include <QtGui/qevent.h>
#include <QtGui/qmatrix4x4.h>
#include <QtGui/qpa/qplatformtheme.h>
#include <QtCore/qvarlengtharray.h>
#include <QtCore/qabstractanimation.h>
#include <QtCore/QLibraryInfo>
#include <QtCore/QRunnable>
#include <QtQml/qqmlincubator.h>
#include <QtQml/qqmlinfo.h>
#include <QtQml/private/qqmlmetatype_p.h>

#include <QtQuick/private/qquickpixmapcache_p.h>

#include <private/qqmldebugserviceinterfaces_p.h>
#include <private/qqmldebugconnector_p.h>
#if QT_CONFIG(opengl)
# include <private/qopenglvertexarrayobject_p.h>
# include <private/qsgdefaultrendercontext_p.h>
#endif
#ifndef QT_NO_DEBUG_STREAM
#include <private/qdebug_p.h>
#endif

#include <QtGui/private/qrhi_p.h>

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(DBG_TOUCH, "qt.quick.touch")
Q_LOGGING_CATEGORY(DBG_TOUCH_TARGET, "qt.quick.touch.target")
Q_LOGGING_CATEGORY(DBG_MOUSE, "qt.quick.mouse")
Q_LOGGING_CATEGORY(DBG_MOUSE_TARGET, "qt.quick.mouse.target")
Q_LOGGING_CATEGORY(lcTablet, "qt.quick.tablet")
Q_LOGGING_CATEGORY(lcWheelTarget, "qt.quick.wheel.target")
Q_LOGGING_CATEGORY(lcGestureTarget, "qt.quick.gesture.target")
Q_LOGGING_CATEGORY(DBG_HOVER_TRACE, "qt.quick.hover.trace")
Q_LOGGING_CATEGORY(DBG_FOCUS, "qt.quick.focus")
Q_LOGGING_CATEGORY(DBG_DIRTY, "qt.quick.dirty")
Q_LOGGING_CATEGORY(lcTransient, "qt.quick.window.transient")

extern Q_GUI_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha);
extern Q_GUI_EXPORT bool qt_sendShortcutOverrideEvent(QObject *o, ulong timestamp, int k, Qt::KeyboardModifiers mods, const QString &text = QString(), bool autorep = false, ushort count = 1);

bool QQuickWindowPrivate::defaultAlphaBuffer = false;

#if defined(QT_QUICK_DEFAULT_TEXT_RENDER_TYPE)
QQuickWindow::TextRenderType QQuickWindowPrivate::textRenderType = QQuickWindow::QT_QUICK_DEFAULT_TEXT_RENDER_TYPE;
#else
QQuickWindow::TextRenderType QQuickWindowPrivate::textRenderType = QQuickWindow::QtTextRendering;
#endif

void QQuickWindowPrivate::updateFocusItemTransform()
{
#if QT_CONFIG(im)
    Q_Q(QQuickWindow);
    QQuickItem *focus = q->activeFocusItem();
    if (focus && QGuiApplication::focusObject() == focus) {
        QQuickItemPrivate *focusPrivate = QQuickItemPrivate::get(focus);
        QGuiApplication::inputMethod()->setInputItemTransform(focusPrivate->itemToWindowTransform());
        QGuiApplication::inputMethod()->setInputItemRectangle(QRectF(0, 0, focusPrivate->width, focusPrivate->height));
        focus->updateInputMethod(Qt::ImInputItemClipRectangle);
    }
#endif
}

class QQuickWindowIncubationController : public QObject, public QQmlIncubationController
{
    Q_OBJECT

public:
    QQuickWindowIncubationController(QSGRenderLoop *loop)
        : m_renderLoop(loop), m_timer(0)
    {
        // Allow incubation for 1/3 of a frame.
        m_incubation_time = qMax(1, int(1000 / QGuiApplication::primaryScreen()->refreshRate()) / 3);

        QAnimationDriver *animationDriver = m_renderLoop->animationDriver();
        if (animationDriver) {
            connect(animationDriver, SIGNAL(stopped()), this, SLOT(animationStopped()));
            connect(m_renderLoop, SIGNAL(timeToIncubate()), this, SLOT(incubate()));
        }
    }

protected:
    void timerEvent(QTimerEvent *) override
    {
        killTimer(m_timer);
        m_timer = 0;
        incubate();
    }

    void incubateAgain() {
        if (m_timer == 0) {
            // Wait for a while before processing the next batch. Using a
            // timer to avoid starvation of system events.
            m_timer = startTimer(m_incubation_time);
        }
    }

public slots:
    void incubate() {
        if (m_renderLoop && incubatingObjectCount()) {
            if (m_renderLoop->interleaveIncubation()) {
                incubateFor(m_incubation_time);
            } else {
                incubateFor(m_incubation_time * 2);
                if (incubatingObjectCount())
                    incubateAgain();
            }
        }
    }

    void animationStopped() { incubate(); }

protected:
    void incubatingObjectCountChanged(int count) override
    {
        if (count && m_renderLoop && !m_renderLoop->interleaveIncubation())
            incubateAgain();
    }

private:
    QPointer<QSGRenderLoop> m_renderLoop;
    int m_incubation_time;
    int m_timer;
};

#include "qquickwindow.moc"
#include "moc_qquickwindow_p.cpp"


#if QT_CONFIG(accessibility)
/*!
    Returns an accessibility interface for this window, or 0 if such an
    interface cannot be created.
*/
QAccessibleInterface *QQuickWindow::accessibleRoot() const
{
    return QAccessible::queryAccessibleInterface(const_cast<QQuickWindow*>(this));
}
#endif


/*
Focus behavior
==============

Prior to being added to a valid window items can set and clear focus with no
effect.  Only once items are added to a window (by way of having a parent set that
already belongs to a window) do the focus rules apply.  Focus goes back to
having no effect if an item is removed from a window.

When an item is moved into a new focus scope (either being added to a window
for the first time, or having its parent changed), if the focus scope already has
a scope focused item that takes precedence over the item being added.  Otherwise,
the focus of the added tree is used.  In the case of a tree of items being
added to a window for the first time, which may have a conflicted focus state (two
or more items in one scope having focus set), the same rule is applied item by item -
thus the first item that has focus will get it (assuming the scope doesn't already
have a scope focused item), and the other items will have their focus cleared.
*/

QQuickRootItem::QQuickRootItem()
{
}

/*! \reimp */
void QQuickWindow::exposeEvent(QExposeEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->exposureChanged(this);
}

/*! \reimp */
void QQuickWindow::resizeEvent(QResizeEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->contentItem)
        d->contentItem->setSize(ev->size());
    if (d->windowManager)
        d->windowManager->resize(this);
}

/*! \reimp */
void QQuickWindow::showEvent(QShowEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->show(this);
}

/*! \reimp */
void QQuickWindow::hideEvent(QHideEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->hide(this);
}

/*! \reimp */
void QQuickWindow::focusOutEvent(QFocusEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->contentItem)
        d->contentItem->setFocus(false, ev->reason());
}

/*! \reimp */
void QQuickWindow::focusInEvent(QFocusEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->contentItem)
        d->contentItem->setFocus(true, ev->reason());
    d->updateFocusItemTransform();
}

#if QT_CONFIG(im)
static bool transformDirtyOnItemOrAncestor(const QQuickItem *item)
{
    while (item) {
        if (QQuickItemPrivate::get(item)->dirtyAttributes & (
            QQuickItemPrivate::TransformOrigin |
            QQuickItemPrivate::Transform |
            QQuickItemPrivate::BasicTransform |
            QQuickItemPrivate::Position |
            QQuickItemPrivate::Size |
            QQuickItemPrivate::ParentChanged |
            QQuickItemPrivate::Clip)) {
            return true;
        }
        item = item->parentItem();
    }
    return false;
}
#endif

/*!
 *  \internal

    A "polish loop" can occur inside QQuickWindowPrivate::polishItems(). It is when an item calls
    polish() on an(other?) item from updatePolish(). If this anomaly happens repeatedly and without
    interruption (of a well-behaved updatePolish() that doesn't call polish()), it is a strong
    indication that we are heading towards an infinite polish loop. A polish loop is not a bug in
    Qt Quick - it is a bug caused by ill-behaved items put in the scene.

    We can detect this sequence of polish loops easily, since the
    QQuickWindowPrivate::itemsToPolish is basically a stack: polish() will push to it, and
    polishItems() will pop from it.
    Therefore if updatePolish() calls polish(), the immediate next item polishItems() processes is
    the item that was polished by the previous call to updatePolish().
    We therefore just need to count the number of polish loops we detected in _sequence_.
*/
struct PolishLoopDetector
{
    PolishLoopDetector(const QVector<QQuickItem*> &itemsToPolish)
        : itemsToPolish(itemsToPolish)
    {
    }

    /*
     * returns true when it detected a likely infinite loop
     * (suggests it should abort the polish loop)
     **/
    bool check(QQuickItem *item, int itemsRemainingBeforeUpdatePolish)
    {
        if (itemsToPolish.count() > itemsRemainingBeforeUpdatePolish) {
            // Detected potential polish loop.
            ++numPolishLoopsInSequence;
            if (numPolishLoopsInSequence >= 1000) {
                // Start to warn about polish loop after 1000 consecutive polish loops
                if (numPolishLoopsInSequence == 100000) {
                    // We have looped 100,000 times without actually reducing the list of items to
                    // polish, give up for now.
                    // This is not a fix, just a remedy so that the application can be somewhat
                    // responsive.
                    numPolishLoopsInSequence = 0;
                    return true;
                } else if (numPolishLoopsInSequence < 1005) {
                    // Show the 5 next items involved in the polish loop.
                    // (most likely they will be the same 5 items...)
                    QQuickItem *guiltyItem = itemsToPolish.last();
                    qmlWarning(item) << "possible QQuickItem::polish() loop";

                    auto typeAndObjectName = [](QQuickItem *item) {
                        QString typeName = QQmlMetaType::prettyTypeName(item);
                        QString objName = item->objectName();
                        if (!objName.isNull())
                            return QLatin1String("%1(%2)").arg(typeName, objName);
                        return typeName;
                    };

                    qmlWarning(guiltyItem) << typeAndObjectName(guiltyItem)
                               << " called polish() inside updatePolish() of " << typeAndObjectName(item);

                    if (numPolishLoopsInSequence == 1004)
                        // Enough warnings. Reset counter in order to speed things up and re-detect
                        // more loops
                        numPolishLoopsInSequence = 0;
                }
            }
        } else {
            numPolishLoopsInSequence = 0;
        }
        return false;
    }
    const QVector<QQuickItem*> &itemsToPolish;      // Just a ref to the one in polishItems()
    int numPolishLoopsInSequence = 0;
};

void QQuickWindowPrivate::polishItems()
{
    // An item can trigger polish on another item, or itself for that matter,
    // during its updatePolish() call. Because of this, we cannot simply
    // iterate through the set, we must continue pulling items out until it
    // is empty.
    // In the case where polish is called from updatePolish() either directly
    // or indirectly, we use a PolishLoopDetector to determine if a warning should
    // be printed to the user.

    PolishLoopDetector polishLoopDetector(itemsToPolish);
    while (!itemsToPolish.isEmpty()) {
        QQuickItem *item = itemsToPolish.takeLast();
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->polishScheduled = false;
        const int itemsRemaining = itemsToPolish.count();
        itemPrivate->updatePolish();
        item->updatePolish();
        if (polishLoopDetector.check(item, itemsRemaining) == true)
            break;
    }

#if QT_CONFIG(im)
    if (QQuickItem *focusItem = q_func()->activeFocusItem()) {
        // If the current focus item, or any of its anchestors, has changed location
        // inside the window, we need inform IM about it. This to ensure that overlays
        // such as selection handles will be updated.
        const bool isActiveFocusItem = (focusItem == QGuiApplication::focusObject());
        const bool hasImEnabled = focusItem->inputMethodQuery(Qt::ImEnabled).toBool();
        if (isActiveFocusItem && hasImEnabled && transformDirtyOnItemOrAncestor(focusItem))
            updateFocusItemTransform();
    }
#endif
}

/*!
 * Schedules the window to render another frame.
 *
 * Calling QQuickWindow::update() differs from QQuickItem::update() in that
 * it always triggers a repaint, regardless of changes in the underlying
 * scene graph or not.
 */
void QQuickWindow::update()
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->update(this);
    else if (d->renderControl)
        QQuickRenderControlPrivate::get(d->renderControl)->update();
}

static void updatePixelRatioHelper(QQuickItem *item, float pixelRatio)
{
    if (item->flags() & QQuickItem::ItemHasContents) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->itemChange(QQuickItem::ItemDevicePixelRatioHasChanged, pixelRatio);
    }

    QList <QQuickItem *> items = item->childItems();
    for (int i = 0; i < items.size(); ++i)
        updatePixelRatioHelper(items.at(i), pixelRatio);
}

void QQuickWindow::physicalDpiChanged()
{
    Q_D(QQuickWindow);
    const qreal newPixelRatio = screen()->devicePixelRatio();
    if (qFuzzyCompare(newPixelRatio, d->devicePixelRatio))
        return;
    d->devicePixelRatio = newPixelRatio;
    if (d->contentItem)
        updatePixelRatioHelper(d->contentItem, newPixelRatio);
}

void QQuickWindow::handleScreenChanged(QScreen *screen)
{
    Q_D(QQuickWindow);
    disconnect(d->physicalDpiChangedConnection);
    if (screen) {
        physicalDpiChanged();
        // When physical DPI changes on the same screen, either the resolution or the device pixel
        // ratio changed. We must check what it is. Device pixel ratio does not have its own
        // ...Changed() signal.
        d->physicalDpiChangedConnection = connect(screen, &QScreen::physicalDotsPerInchChanged,
                                                  this, &QQuickWindow::physicalDpiChanged);
    }

    d->forcePolish();
}

void forcePolishHelper(QQuickItem *item)
{
    if (item->flags() & QQuickItem::ItemHasContents) {
        item->polish();
    }

    QList <QQuickItem *> items = item->childItems();
    for (int i=0; i<items.size(); ++i)
        forcePolishHelper(items.at(i));
}

/*!
    Schedules polish events on all items in the scene.
*/
void QQuickWindowPrivate::forcePolish()
{
    Q_Q(QQuickWindow);
    if (!q->screen())
        return;
    forcePolishHelper(contentItem);
}

void forceUpdate(QQuickItem *item)
{
    if (item->flags() & QQuickItem::ItemHasContents)
        item->update();
    QQuickItemPrivate::get(item)->dirty(QQuickItemPrivate::ChildrenUpdateMask);

    QList <QQuickItem *> items = item->childItems();
    for (int i=0; i<items.size(); ++i)
        forceUpdate(items.at(i));
}

void QQuickWindowPrivate::syncSceneGraph()
{
    Q_Q(QQuickWindow);

    // Calculate the dpr the same way renderSceneGraph() will.
    qreal devicePixelRatio = q->effectiveDevicePixelRatio();
    if (renderTargetId && !QQuickRenderControl::renderWindowFor(q))
        devicePixelRatio = 1;

    context->prepareSync(devicePixelRatio, rhi ? swapchain->currentFrameCommandBuffer() : nullptr);

    animationController->beforeNodeSync();

    emit q->beforeSynchronizing();
    runAndClearJobs(&beforeSynchronizingJobs);
    if (!renderer) {
        forceUpdate(contentItem);

        QSGRootNode *rootNode = new QSGRootNode;
        rootNode->appendChildNode(QQuickItemPrivate::get(contentItem)->itemNode());
        renderer = context->createRenderer();
        renderer->setRootNode(rootNode);
    }

    updateDirtyNodes();

    animationController->afterNodeSync();

    // Copy the current state of clearing from window into renderer.
    renderer->setClearColor(clearColor);
    QSGAbstractRenderer::ClearMode mode = QSGAbstractRenderer::ClearStencilBuffer | QSGAbstractRenderer::ClearDepthBuffer;
    if (clearBeforeRendering)
        mode |= QSGAbstractRenderer::ClearColorBuffer;
    renderer->setClearMode(mode);

    renderer->setCustomRenderMode(customRenderMode);

    emit q->afterSynchronizing();
    runAndClearJobs(&afterSynchronizingJobs);
}

void QQuickWindowPrivate::emitBeforeRenderPassRecording(void *ud)
{
    QQuickWindow *w = reinterpret_cast<QQuickWindow *>(ud);
    emit w->beforeRenderPassRecording();
}

void QQuickWindowPrivate::emitAfterRenderPassRecording(void *ud)
{
    QQuickWindow *w = reinterpret_cast<QQuickWindow *>(ud);
    emit w->afterRenderPassRecording();
}

void QQuickWindowPrivate::renderSceneGraph(const QSize &size, const QSize &surfaceSize)
{
    Q_Q(QQuickWindow);
    if (!renderer)
        return;

    if (rhi) {
        // ### no offscreen ("renderTargetId") support yet
        context->beginNextRhiFrame(renderer,
                                   swapchain->currentFrameRenderTarget(),
                                   rpDescForSwapchain,
                                   swapchain->currentFrameCommandBuffer(),
                                   emitBeforeRenderPassRecording,
                                   emitAfterRenderPassRecording,
                                   q);
    } else {
        context->beginNextFrame(renderer,
                                emitBeforeRenderPassRecording,
                                emitAfterRenderPassRecording,
                                q);
    }

    animationController->advance();
    emit q->beforeRendering();
    runAndClearJobs(&beforeRenderingJobs);
    if (!customRenderStage || !customRenderStage->render()) {
        int fboId = 0;
        const qreal devicePixelRatio = q->effectiveDevicePixelRatio();
        if (renderTargetId) {
            QRect rect(QPoint(0, 0), renderTargetSize);
            fboId = renderTargetId;
            renderer->setDeviceRect(rect);
            renderer->setViewportRect(rect);
            if (QQuickRenderControl::renderWindowFor(q)) {
                renderer->setProjectionMatrixToRect(QRect(QPoint(0, 0), size));
                renderer->setDevicePixelRatio(devicePixelRatio);
            } else {
                renderer->setProjectionMatrixToRect(QRect(QPoint(0, 0), rect.size()));
                renderer->setDevicePixelRatio(1);
            }
        } else {
            QSize pixelSize;
            QSizeF logicalSize;
            if (surfaceSize.isEmpty()) {
                pixelSize = size * devicePixelRatio;
                logicalSize = size;
            } else {
                pixelSize = surfaceSize;
                logicalSize = QSizeF(surfaceSize) / devicePixelRatio;
            }
            QRect rect(QPoint(0, 0), pixelSize);
            renderer->setDeviceRect(rect);
            renderer->setViewportRect(rect);
            const bool flipY = rhi ? !rhi->isYUpInNDC() : false;
            QSGAbstractRenderer::MatrixTransformFlags matrixFlags;
            if (flipY)
                matrixFlags |= QSGAbstractRenderer::MatrixTransformFlipY;
            renderer->setProjectionMatrixToRect(QRectF(QPoint(0, 0), logicalSize), matrixFlags);
            renderer->setDevicePixelRatio(devicePixelRatio);
        }

        if (rhi)
            context->renderNextRhiFrame(renderer);
        else
            context->renderNextFrame(renderer, fboId);
    }
    emit q->afterRendering();
    runAndClearJobs(&afterRenderingJobs);

    if (rhi)
        context->endNextRhiFrame(renderer);
    else
        context->endNextFrame(renderer);

    if (renderer && renderer->hasCustomRenderModeWithContinuousUpdate()) {
        // For the overdraw visualizer. This update is not urgent so avoid a
        // direct update() call, this is only here to keep the overdraw
        // visualization box rotating even when the scene is static.
        QCoreApplication::postEvent(q, new QEvent(QEvent::Type(FullUpdateRequest)));
    }
}

QQuickWindowPrivate::QQuickWindowPrivate()
    : contentItem(nullptr)
    , activeFocusItem(nullptr)
#if QT_CONFIG(cursor)
    , cursorItem(nullptr)
    , cursorHandler(nullptr)
#endif
#if QT_CONFIG(quick_draganddrop)
    , dragGrabber(nullptr)
#endif
    , touchMouseId(-1)
    , touchMouseDevice(nullptr)
    , touchMousePressTimestamp(0)
    , dirtyItemList(nullptr)
    , devicePixelRatio(0)
    , context(nullptr)
    , renderer(nullptr)
    , windowManager(nullptr)
    , renderControl(nullptr)
    , pointerEventRecursionGuard(0)
    , customRenderStage(nullptr)
    , clearColor(Qt::white)
    , clearBeforeRendering(true)
    , persistentGLContext(true)
    , persistentSceneGraph(true)
    , lastWheelEventAccepted(false)
    , componentCompleted(true)
    , allowChildEventFiltering(true)
    , allowDoubleClick(true)
    , lastFocusReason(Qt::OtherFocusReason)
    , renderTarget(nullptr)
    , renderTargetId(0)
    , vaoHelper(nullptr)
    , incubationController(nullptr)
    , hasActiveSwapchain(false)
    , hasRenderableSwapchain(false)
    , swapchainJustBecameRenderable(false)
{
#if QT_CONFIG(quick_draganddrop)
    dragGrabber = new QQuickDragGrabber;
#endif
}

QQuickWindowPrivate::~QQuickWindowPrivate()
{
    delete customRenderStage;
    if (QQmlInspectorService *service = QQmlDebugConnector::service<QQmlInspectorService>())
        service->removeWindow(q_func());
}

void QQuickWindowPrivate::init(QQuickWindow *c, QQuickRenderControl *control)
{
    q_ptr = c;


    Q_Q(QQuickWindow);

    contentItem = new QQuickRootItem;
    QQml_setParent_noEvent(contentItem, c);
    QQmlEngine::setObjectOwnership(contentItem, QQmlEngine::CppOwnership);
    QQuickItemPrivate *contentItemPrivate = QQuickItemPrivate::get(contentItem);
    contentItemPrivate->window = q;
    contentItemPrivate->windowRefCount = 1;
    contentItemPrivate->flags |= QQuickItem::ItemIsFocusScope;
    contentItem->setSize(q->size());

    customRenderMode = qgetenv("QSG_VISUALIZE");
    renderControl = control;
    if (renderControl)
        QQuickRenderControlPrivate::get(renderControl)->window = q;

    if (!renderControl)
        windowManager = QSGRenderLoop::instance();

    Q_ASSERT(windowManager || renderControl);

    if (QScreen *screen = q->screen())
       devicePixelRatio = screen->devicePixelRatio();

    QSGContext *sg;
    if (renderControl) {
        QQuickRenderControlPrivate *renderControlPriv = QQuickRenderControlPrivate::get(renderControl);
        sg = renderControlPriv->sg;
        context = renderControlPriv->rc;
    } else {
        windowManager->addWindow(q);
        sg = windowManager->sceneGraphContext();
        context = windowManager->createRenderContext(sg);
    }

    q->setSurfaceType(windowManager ? windowManager->windowSurfaceType() : QSurface::OpenGLSurface);
    q->setFormat(sg->defaultSurfaceFormat());
#if QT_CONFIG(vulkan)
    if (q->surfaceType() == QSurface::VulkanSurface)
        q->setVulkanInstance(QSGRhiSupport::vulkanInstance());
#endif

    animationController.reset(new QQuickAnimatorController(q));

    QObject::connect(context, SIGNAL(initialized()), q, SIGNAL(sceneGraphInitialized()), Qt::DirectConnection);
    QObject::connect(context, SIGNAL(invalidated()), q, SIGNAL(sceneGraphInvalidated()), Qt::DirectConnection);
    QObject::connect(context, SIGNAL(invalidated()), q, SLOT(cleanupSceneGraph()), Qt::DirectConnection);

    QObject::connect(q, SIGNAL(focusObjectChanged(QObject*)), q, SIGNAL(activeFocusItemChanged()));
    QObject::connect(q, SIGNAL(screenChanged(QScreen*)), q, SLOT(handleScreenChanged(QScreen*)));
    QObject::connect(qApp, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
                     q, SLOT(handleApplicationStateChanged(Qt::ApplicationState)));
    QObject::connect(q, SIGNAL(frameSwapped()), q, SLOT(runJobsAfterSwap()), Qt::DirectConnection);

    if (QQmlInspectorService *service = QQmlDebugConnector::service<QQmlInspectorService>())
        service->addWindow(q);
}

void QQuickWindow::handleApplicationStateChanged(Qt::ApplicationState state)
{
    Q_D(QQuickWindow);
    if (state != Qt::ApplicationActive && d->contentItem)
        d->contentItem->windowDeactivateEvent();
}

/*!
    \property QQuickWindow::data
    \internal
*/

QQmlListProperty<QObject> QQuickWindowPrivate::data()
{
    return QQmlListProperty<QObject>(q_func(), nullptr,
                                     QQuickWindowPrivate::data_append,
                                     QQuickWindowPrivate::data_count,
                                     QQuickWindowPrivate::data_at,
                                     QQuickWindowPrivate::data_clear,
                                     QQuickWindowPrivate::data_replace,
                                     QQuickWindowPrivate::data_removeLast);
}

static QMouseEvent *touchToMouseEvent(QEvent::Type type, const QTouchEvent::TouchPoint &p, QTouchEvent *event, QQuickItem *item, bool transformNeeded = true)
{
    Q_ASSERT(QCoreApplication::testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents));
    // The touch point local position and velocity are not yet transformed.
    QMouseEvent *me = new QMouseEvent(type, transformNeeded ? item->mapFromScene(p.scenePos()) : p.pos(), p.scenePos(), p.screenPos(),
                                      Qt::LeftButton, (type == QEvent::MouseButtonRelease ? Qt::NoButton : Qt::LeftButton), event->modifiers());
    me->setAccepted(true);
    me->setTimestamp(event->timestamp());
    QVector2D transformedVelocity = p.velocity();
    if (transformNeeded) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        QMatrix4x4 transformMatrix(itemPrivate->windowToItemTransform());
        transformedVelocity = transformMatrix.mapVector(p.velocity()).toVector2D();
    }
    QGuiApplicationPrivate::setMouseEventCapsAndVelocity(me, event->device()->capabilities(), transformedVelocity);
    QGuiApplicationPrivate::setMouseEventSource(me, Qt::MouseEventSynthesizedByQt);
    return me;
}

bool QQuickWindowPrivate::checkIfDoubleTapped(ulong newPressEventTimestamp, QPoint newPressPos)
{
    bool doubleClicked = false;

    if (touchMousePressTimestamp > 0) {
        QPoint distanceBetweenPresses = newPressPos - touchMousePressPos;
        const int doubleTapDistance = QGuiApplication::styleHints()->touchDoubleTapDistance();
        doubleClicked = (qAbs(distanceBetweenPresses.x()) <= doubleTapDistance) && (qAbs(distanceBetweenPresses.y()) <= doubleTapDistance);

        if (doubleClicked) {
            ulong timeBetweenPresses = newPressEventTimestamp - touchMousePressTimestamp;
            ulong doubleClickInterval = static_cast<ulong>(QGuiApplication::styleHints()->
                    mouseDoubleClickInterval());
            doubleClicked = timeBetweenPresses < doubleClickInterval;
        }
    }
    if (doubleClicked) {
        touchMousePressTimestamp = 0;
    } else {
        touchMousePressTimestamp = newPressEventTimestamp;
        touchMousePressPos = newPressPos;
    }

    return doubleClicked;
}

void QQuickWindowPrivate::cancelTouchMouseSynthesis()
{
    qCDebug(DBG_TOUCH_TARGET);
    touchMouseId = -1;
    touchMouseDevice = nullptr;
}

bool QQuickWindowPrivate::deliverTouchAsMouse(QQuickItem *item, QQuickPointerEvent *pointerEvent)
{
    Q_ASSERT(QCoreApplication::testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents));
    Q_Q(QQuickWindow);
    auto device = pointerEvent->device();

    // A touch event from a trackpad is likely to be followed by a mouse or gesture event, so mouse event synth is redundant
    if (device->type() == QQuickPointerDevice::TouchPad && device->capabilities().testFlag(QQuickPointerDevice::MouseEmulation)) {
        qCDebug(DBG_TOUCH_TARGET) << "skipping delivery of synth-mouse event from" << device;
        return false;
    }

    // FIXME: make this work for mouse events too and get rid of the asTouchEvent in here.
    Q_ASSERT(pointerEvent->asPointerTouchEvent());
    QScopedPointer<QTouchEvent> event(pointerEvent->asPointerTouchEvent()->touchEventForItem(item));
    if (event.isNull())
        return false;

    // For each point, check if it is accepted, if not, try the next point.
    // Any of the fingers can become the mouse one.
    // This can happen because a mouse area might not accept an event at some point but another.
    for (int i = 0; i < event->touchPoints().count(); ++i) {
        const QTouchEvent::TouchPoint &p = event->touchPoints().at(i);
        // A new touch point
        if (touchMouseId == -1 && p.state() & Qt::TouchPointPressed) {
            QPointF pos = item->mapFromScene(p.scenePos());

            // probably redundant, we check bounds in the calling function (matchingNewPoints)
            if (!item->contains(pos))
                break;

            qCDebug(DBG_TOUCH_TARGET) << "TP (mouse)" << Qt::hex << p.id() << "->" << item;
            QScopedPointer<QMouseEvent> mousePress(touchToMouseEvent(QEvent::MouseButtonPress, p, event.data(), item, false));

            // Send a single press and see if that's accepted
            QCoreApplication::sendEvent(item, mousePress.data());
            event->setAccepted(mousePress->isAccepted());
            if (mousePress->isAccepted()) {
                touchMouseDevice = device;
                touchMouseId = p.id();
                if (!q->mouseGrabberItem())
                    item->grabMouse();
                if (auto pointerEventPoint = pointerEvent->pointById(p.id()))
                    pointerEventPoint->setGrabberItem(item);

                if (checkIfDoubleTapped(event->timestamp(), p.screenPos().toPoint())) {
                    // since we synth the mouse event from from touch, we respect the
                    // QPlatformTheme::TouchDoubleTapDistance instead of QPlatformTheme::MouseDoubleClickDistance
                    QScopedPointer<QMouseEvent> mouseDoubleClick(touchToMouseEvent(QEvent::MouseButtonDblClick, p, event.data(), item, false));
                    QCoreApplication::sendEvent(item, mouseDoubleClick.data());
                    event->setAccepted(mouseDoubleClick->isAccepted());
                    if (!mouseDoubleClick->isAccepted())
                        cancelTouchMouseSynthesis();
                }

                return true;
            }
            // try the next point

        // Touch point was there before and moved
        } else if (touchMouseDevice == device && p.id() == touchMouseId) {
            if (p.state() & Qt::TouchPointMoved) {
                if (touchMousePressTimestamp != 0) {
                    const int doubleTapDistance = QGuiApplicationPrivate::platformTheme()->themeHint(QPlatformTheme::TouchDoubleTapDistance).toInt();
                    const QPoint moveDelta = p.screenPos().toPoint() - touchMousePressPos;
                    if (moveDelta.x() >= doubleTapDistance || moveDelta.y() >= doubleTapDistance)
                        touchMousePressTimestamp = 0;   // Got dragged too far, dismiss the double tap
                }
                if (QQuickItem *mouseGrabberItem = q->mouseGrabberItem()) {
                    QScopedPointer<QMouseEvent> me(touchToMouseEvent(QEvent::MouseMove, p, event.data(), mouseGrabberItem, false));
                    QCoreApplication::sendEvent(item, me.data());
                    event->setAccepted(me->isAccepted());
                    if (me->isAccepted()) {
                        qCDebug(DBG_TOUCH_TARGET) << "TP (mouse)" << Qt::hex << p.id() << "->" << mouseGrabberItem;
                    }
                    return event->isAccepted();
                } else {
                    // no grabber, check if we care about mouse hover
                    // FIXME: this should only happen once, not recursively... I'll ignore it just ignore hover now.
                    // hover for touch???
                    QScopedPointer<QMouseEvent> me(touchToMouseEvent(QEvent::MouseMove, p, event.data(), item, false));
                    if (lastMousePosition.isNull())
                        lastMousePosition = me->windowPos();
                    QPointF last = lastMousePosition;
                    lastMousePosition = me->windowPos();

                    bool accepted = me->isAccepted();
                    bool delivered = deliverHoverEvent(contentItem, me->windowPos(), last, me->modifiers(), me->timestamp(), accepted);
                    if (!delivered) {
                        //take care of any exits
                        accepted = clearHover(me->timestamp());
                    }
                    me->setAccepted(accepted);
                    break;
                }
            } else if (p.state() & Qt::TouchPointReleased) {
                // currently handled point was released
                if (QQuickItem *mouseGrabberItem = q->mouseGrabberItem()) {
                    QScopedPointer<QMouseEvent> me(touchToMouseEvent(QEvent::MouseButtonRelease, p, event.data(), mouseGrabberItem, false));
                    QCoreApplication::sendEvent(item, me.data());

                    if (item->acceptHoverEvents() && p.screenPos() != QGuiApplicationPrivate::lastCursorPosition) {
                        QPointF localMousePos(qInf(), qInf());
                        if (QWindow *w = item->window())
                            localMousePos = item->mapFromScene(w->mapFromGlobal(QGuiApplicationPrivate::lastCursorPosition.toPoint()));
                        QMouseEvent mm(QEvent::MouseMove, localMousePos, QGuiApplicationPrivate::lastCursorPosition,
                                       Qt::NoButton, Qt::NoButton, event->modifiers());
                        QCoreApplication::sendEvent(item, &mm);
                    }
                    if (q->mouseGrabberItem()) // might have ungrabbed due to event
                        q->mouseGrabberItem()->ungrabMouse();

                    cancelTouchMouseSynthesis();
                    return me->isAccepted();
                }
            }
            break;
        }
    }
    return false;
}

void QQuickWindowPrivate::grabTouchPoints(QObject *grabber, const QVector<int> &ids)
{
    QQuickPointerEvent *ev = nullptr;
    for (int i = 0; i < ids.count(); ++i) {
        int id = ids.at(i);
        if (Q_UNLIKELY(id < 0)) {
            qWarning("ignoring grab of touchpoint %d", id);
            continue;
        }
        if (id == touchMouseId) {
            auto point = pointerEventInstance(touchMouseDevice)->pointById(id);
            auto touchMouseGrabber = point->grabberItem();
            if (touchMouseGrabber) {
                point->setExclusiveGrabber(nullptr);
                touchMouseGrabber->mouseUngrabEvent();
                touchMouseGrabber->touchUngrabEvent();
                cancelTouchMouseSynthesis();
            }
            qCDebug(DBG_MOUSE_TARGET) << "grabTouchPoints: mouse grabber changed due to grabTouchPoints:" << touchMouseGrabber << "-> null";
        }

        // optimization to avoid the loop over devices below:
        // all ids are probably from the same event, so we don't have to search
        if (ev) {
            auto point = ev->pointById(id);
            if (point && point->exclusiveGrabber() != grabber) {
                point->setExclusiveGrabber(grabber);
                continue; // next id in the ids loop
            }
        }
        // search all devices for a QQuickPointerEvent instance that is delivering the point with id
        const auto touchDevices = QQuickPointerDevice::touchDevices();
        for (auto device : touchDevices) {
            QQuickPointerEvent *pev = pointerEventInstance(device);
            auto point = pev->pointById(id);
            if (point) {
                ev = pev;
                if (point->exclusiveGrabber() != grabber)
                    point->setExclusiveGrabber(grabber);
                break; // out of touchDevices loop
            }
        }
    }
}

/*!
    Ungrabs all touchpoint grabs and/or the mouse grab from the given item \a grabber.
    This should not be called when processing a release event - that's redundant.
    It is called in other cases, when the points may not be released, but the item
    nevertheless must lose its grab due to becoming disabled, invisible, etc.
    QQuickEventPoint::setGrabberItem() calls touchUngrabEvent() when all points are released,
    but if not all points are released, it cannot be sure whether to call touchUngrabEvent()
    or not; so we have to do it here.
*/
void QQuickWindowPrivate::removeGrabber(QQuickItem *grabber, bool mouse, bool touch)
{
    Q_Q(QQuickWindow);
    if (Q_LIKELY(mouse) && q->mouseGrabberItem() == grabber) {
        bool fromTouch = isDeliveringTouchAsMouse();
        auto point = fromTouch ?
            pointerEventInstance(touchMouseDevice)->pointById(touchMouseId) :
            pointerEventInstance(QQuickPointerDevice::genericMouseDevice())->point(0);
        QQuickItem *oldGrabber = point->grabberItem();
        qCDebug(DBG_MOUSE_TARGET) << "removeGrabber" << oldGrabber << "-> null";
        point->setGrabberItem(nullptr);
        sendUngrabEvent(oldGrabber, fromTouch);
    }
    if (Q_LIKELY(touch)) {
        bool ungrab = false;
        const auto touchDevices = QQuickPointerDevice::touchDevices();
        for (auto device : touchDevices) {
            if (auto pointerEvent = queryPointerEventInstance(device)) {
                for (int i = 0; i < pointerEvent->pointCount(); ++i) {
                    if (pointerEvent->point(i)->exclusiveGrabber() == grabber) {
                        pointerEvent->point(i)->setGrabberItem(nullptr);
                        ungrab = true;
                    }
                }
            }
        }
        if (ungrab)
            grabber->touchUngrabEvent();
    }
}

void QQuickWindowPrivate::sendUngrabEvent(QQuickItem *grabber, bool touch)
{
    if (!grabber)
        return;
    QEvent e(QEvent::UngrabMouse);
    hasFiltered.clear();
    if (!sendFilteredMouseEvent(&e, grabber, grabber->parentItem())) {
        grabber->mouseUngrabEvent();
        if (touch)
            grabber->touchUngrabEvent();
    }
}

/*!
Translates the data in \a touchEvent to this window.  This method leaves the item local positions in
\a touchEvent untouched (these are filled in later).
*/
void QQuickWindowPrivate::translateTouchEvent(QTouchEvent *touchEvent)
{
    QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints();
    for (int i = 0; i < touchPoints.count(); ++i) {
        QTouchEvent::TouchPoint &touchPoint = touchPoints[i];
        touchPoint.setScenePos(touchPoint.pos());
        touchPoint.setStartScenePos(touchPoint.startPos());
        touchPoint.setLastScenePos(touchPoint.lastPos());
    }
    touchEvent->setTouchPoints(touchPoints);
}


static inline bool windowHasFocus(QQuickWindow *win)
{
    const QWindow *focusWindow = QGuiApplication::focusWindow();
    return win == focusWindow || QQuickRenderControl::renderWindowFor(win) == focusWindow;
}

#ifdef Q_OS_WEBOS
// Temporary fix for webOS until multi-seat is implemented see QTBUG-85272
static inline bool singleWindowOnScreen(QQuickWindow *win)
{
    const QWindowList windowList = QGuiApplication::allWindows();
    for (int i = 0; i < windowList.count(); i++) {
        QWindow *ii = windowList.at(i);
        if (ii == win)
            continue;
        if (ii->screen() == win->screen())
            return false;
    }

    return true;
}
#endif

/*!
Set the focus inside \a scope to be \a item.
If the scope contains the active focus item, it will be changed to \a item.
Calls notifyFocusChangesRecur for all changed items.
*/
void QQuickWindowPrivate::setFocusInScope(QQuickItem *scope, QQuickItem *item, Qt::FocusReason reason, FocusOptions options)
{
    Q_Q(QQuickWindow);

    Q_ASSERT(item);
    Q_ASSERT(scope || item == contentItem);

    qCDebug(DBG_FOCUS) << "QQuickWindowPrivate::setFocusInScope():";
    qCDebug(DBG_FOCUS) << "    scope:" << (QObject *)scope;
    if (scope)
        qCDebug(DBG_FOCUS) << "    scopeSubFocusItem:" << (QObject *)QQuickItemPrivate::get(scope)->subFocusItem;
    qCDebug(DBG_FOCUS) << "    item:" << (QObject *)item;
    qCDebug(DBG_FOCUS) << "    activeFocusItem:" << (QObject *)activeFocusItem;

    QQuickItemPrivate *scopePrivate = scope ? QQuickItemPrivate::get(scope) : nullptr;
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

    QQuickItem *oldActiveFocusItem = nullptr;
    QQuickItem *currentActiveFocusItem = activeFocusItem;
    QQuickItem *newActiveFocusItem = nullptr;
    bool sendFocusIn = false;

    lastFocusReason = reason;

    QVarLengthArray<QQuickItem *, 20> changed;

    // Does this change the active focus?
    if (item == contentItem || scopePrivate->activeFocus) {
        oldActiveFocusItem = activeFocusItem;
        if (item->isEnabled()) {
            newActiveFocusItem = item;
            while (newActiveFocusItem->isFocusScope()
                   && newActiveFocusItem->scopedFocusItem()
                   && newActiveFocusItem->scopedFocusItem()->isEnabled()) {
                newActiveFocusItem = newActiveFocusItem->scopedFocusItem();
            }
        } else {
            newActiveFocusItem = scope;
        }

        if (oldActiveFocusItem) {
#if QT_CONFIG(im)
            QGuiApplication::inputMethod()->commit();
#endif

            activeFocusItem = nullptr;

            QQuickItem *afi = oldActiveFocusItem;
            while (afi && afi != scope) {
                if (QQuickItemPrivate::get(afi)->activeFocus) {
                    QQuickItemPrivate::get(afi)->activeFocus = false;
                    changed << afi;
                }
                afi = afi->parentItem();
            }
        }
    }

    if (item != contentItem && !(options & DontChangeSubFocusItem)) {
        QQuickItem *oldSubFocusItem = scopePrivate->subFocusItem;
        if (oldSubFocusItem) {
            QQuickItemPrivate::get(oldSubFocusItem)->focus = false;
            changed << oldSubFocusItem;
        }

        QQuickItemPrivate::get(item)->updateSubFocusItem(scope, true);
    }

    if (!(options & DontChangeFocusProperty)) {
        if (item != contentItem
                || windowHasFocus(q)
#ifdef Q_OS_WEBOS
        // Allow focused if there is only one window in the screen where it belongs.
        // Temporary fix for webOS until multi-seat is implemented see QTBUG-85272
                || singleWindowOnScreen(q)
#endif
                ) {
            itemPrivate->focus = true;
            changed << item;
        }
    }

    if (newActiveFocusItem && contentItem->hasFocus()) {
        activeFocusItem = newActiveFocusItem;

        QQuickItemPrivate::get(newActiveFocusItem)->activeFocus = true;
        changed << newActiveFocusItem;

        QQuickItem *afi = newActiveFocusItem->parentItem();
        while (afi && afi != scope) {
            if (afi->isFocusScope()) {
                QQuickItemPrivate::get(afi)->activeFocus = true;
                changed << afi;
            }
            afi = afi->parentItem();
        }
        updateFocusItemTransform();
        sendFocusIn = true;
    }

    // Now that all the state is changed, emit signals & events
    // We must do this last, as this process may result in further changes to focus.
    if (oldActiveFocusItem) {
        QFocusEvent event(QEvent::FocusOut, reason);
        QCoreApplication::sendEvent(oldActiveFocusItem, &event);
    }

    // Make sure that the FocusOut didn't result in another focus change.
    if (sendFocusIn && activeFocusItem == newActiveFocusItem) {
        QFocusEvent event(QEvent::FocusIn, reason);
        QCoreApplication::sendEvent(newActiveFocusItem, &event);
    }

    if (activeFocusItem != currentActiveFocusItem)
        emit q->focusObjectChanged(activeFocusItem);

    if (!changed.isEmpty())
        notifyFocusChangesRecur(changed.data(), changed.count() - 1);
}

void QQuickWindowPrivate::clearFocusInScope(QQuickItem *scope, QQuickItem *item, Qt::FocusReason reason, FocusOptions options)
{
    Q_Q(QQuickWindow);

    Q_ASSERT(item);
    Q_ASSERT(scope || item == contentItem);

    qCDebug(DBG_FOCUS) << "QQuickWindowPrivate::clearFocusInScope():";
    qCDebug(DBG_FOCUS) << "    scope:" << (QObject *)scope;
    qCDebug(DBG_FOCUS) << "    item:" << (QObject *)item;
    qCDebug(DBG_FOCUS) << "    activeFocusItem:" << (QObject *)activeFocusItem;

    QQuickItemPrivate *scopePrivate = nullptr;
    if (scope) {
        scopePrivate = QQuickItemPrivate::get(scope);
        if ( !scopePrivate->subFocusItem )
            return;//No focus, nothing to do.
    }

    QQuickItem *currentActiveFocusItem = activeFocusItem;
    QQuickItem *oldActiveFocusItem = nullptr;
    QQuickItem *newActiveFocusItem = nullptr;

    lastFocusReason = reason;

    QVarLengthArray<QQuickItem *, 20> changed;

    Q_ASSERT(item == contentItem || item == scopePrivate->subFocusItem);

    // Does this change the active focus?
    if (item == contentItem || scopePrivate->activeFocus) {
        oldActiveFocusItem = activeFocusItem;
        newActiveFocusItem = scope;

#if QT_CONFIG(im)
        QGuiApplication::inputMethod()->commit();
#endif

        activeFocusItem = nullptr;

        if (oldActiveFocusItem) {
            QQuickItem *afi = oldActiveFocusItem;
            while (afi && afi != scope) {
                if (QQuickItemPrivate::get(afi)->activeFocus) {
                    QQuickItemPrivate::get(afi)->activeFocus = false;
                    changed << afi;
                }
                afi = afi->parentItem();
            }
        }
    }

    if (item != contentItem && !(options & DontChangeSubFocusItem)) {
        QQuickItem *oldSubFocusItem = scopePrivate->subFocusItem;
        if (oldSubFocusItem && !(options & DontChangeFocusProperty)) {
            QQuickItemPrivate::get(oldSubFocusItem)->focus = false;
            changed << oldSubFocusItem;
        }

        QQuickItemPrivate::get(item)->updateSubFocusItem(scope, false);

    } else if (!(options & DontChangeFocusProperty)) {
        QQuickItemPrivate::get(item)->focus = false;
        changed << item;
    }

    if (newActiveFocusItem) {
        Q_ASSERT(newActiveFocusItem == scope);
        activeFocusItem = scope;
        updateFocusItemTransform();
    }

    // Now that all the state is changed, emit signals & events
    // We must do this last, as this process may result in further changes to
    // focus.
    if (oldActiveFocusItem) {
        QFocusEvent event(QEvent::FocusOut, reason);
        QCoreApplication::sendEvent(oldActiveFocusItem, &event);
    }

    // Make sure that the FocusOut didn't result in another focus change.
    if (newActiveFocusItem && activeFocusItem == newActiveFocusItem) {
        QFocusEvent event(QEvent::FocusIn, reason);
        QCoreApplication::sendEvent(newActiveFocusItem, &event);
    }

    if (activeFocusItem != currentActiveFocusItem)
        emit q->focusObjectChanged(activeFocusItem);

    if (!changed.isEmpty())
        notifyFocusChangesRecur(changed.data(), changed.count() - 1);
}

void QQuickWindowPrivate::clearFocusObject()
{
    if (activeFocusItem == contentItem)
        return;

    clearFocusInScope(contentItem, QQuickItemPrivate::get(contentItem)->subFocusItem, Qt::OtherFocusReason);
}

void QQuickWindowPrivate::notifyFocusChangesRecur(QQuickItem **items, int remaining)
{
    QPointer<QQuickItem> item(*items);

    if (remaining)
        notifyFocusChangesRecur(items + 1, remaining - 1);

    if (item) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

        if (itemPrivate->notifiedFocus != itemPrivate->focus) {
            itemPrivate->notifiedFocus = itemPrivate->focus;
            emit item->focusChanged(itemPrivate->focus);
        }

        if (item && itemPrivate->notifiedActiveFocus != itemPrivate->activeFocus) {
            itemPrivate->notifiedActiveFocus = itemPrivate->activeFocus;
            itemPrivate->itemChange(QQuickItem::ItemActiveFocusHasChanged, itemPrivate->activeFocus);
            emit item->activeFocusChanged(itemPrivate->activeFocus);
        }
    }
}

void QQuickWindowPrivate::dirtyItem(QQuickItem *)
{
    Q_Q(QQuickWindow);
    q->maybeUpdate();
}

void QQuickWindowPrivate::cleanup(QSGNode *n)
{
    Q_Q(QQuickWindow);

    Q_ASSERT(!cleanupNodeList.contains(n));
    cleanupNodeList.append(n);
    q->maybeUpdate();
}

/*!
    \qmltype Window
    \instantiates QQuickWindow
    \inqmlmodule QtQuick.Window
    \ingroup qtquick-visual
    \brief Creates a new top-level window.

    The Window object creates a new top-level window for a Qt Quick scene. It automatically sets up the
    window for use with \c {QtQuick 2.x} graphical types.

    To use this type, you will need to import the module with the following line:
    \code
    import QtQuick.Window 2.2
    \endcode

    Omitting this import will allow you to have a QML environment without
    access to window system features.

    A Window can be declared inside an Item or inside another Window; in that
    case the inner Window will automatically become "transient for" the outer
    Window: that is, most platforms will show it centered upon the outer window
    by default, and there may be other platform-dependent behaviors, depending
    also on the \l flags. If the nested window is intended to be a dialog in
    your application, you should also set \l flags to Qt.Dialog, because some
    window managers will not provide the centering behavior without that flag.
    You can also declare multiple windows inside a top-level \l QtObject, in which
    case the windows will have no transient relationship.

    Alternatively you can set or bind \l x and \l y to position the Window
    explicitly on the screen.

    When the user attempts to close a window, the \l closing signal will be
    emitted. You can force the window to stay open (for example to prompt the
    user to save changes) by writing an \c onClosing handler and setting
    \c {close.accepted = false}.
*/
/*!
    \class QQuickWindow
    \since 5.0

    \inmodule QtQuick

    \brief The QQuickWindow class provides the window for displaying a graphical QML scene.

    QQuickWindow provides the graphical scene management needed to interact with and display
    a scene of QQuickItems.

    A QQuickWindow always has a single invisible root item. To add items to this window,
    reparent the items to the root item or to an existing item in the scene.

    For easily displaying a scene from a QML file, see \l{QQuickView}.

    \section1 Rendering

    QQuickWindow uses a scene graph to represent what needs to be rendered.
    This scene graph is disconnected from the QML scene and
    potentially lives in another thread, depending on the platform
    implementation. Since the rendering scene graph lives
    independently from the QML scene, it can also be completely
    released without affecting the state of the QML scene.

    The sceneGraphInitialized() signal is emitted on the rendering
    thread before the QML scene is rendered to the screen for the
    first time. If the rendering scene graph has been released, the
    signal will be emitted again before the next frame is rendered.


    \section2 Integration with OpenGL

    When using the default OpenGL adaptation, it is possible to integrate
    OpenGL calls directly into the QQuickWindow using the same OpenGL
    context as the Qt Quick Scene Graph. This is done by connecting to the
    QQuickWindow::beforeRendering() or QQuickWindow::afterRendering()
    signal.

    \note When using QQuickWindow::beforeRendering(), make sure to
    disable clearing before rendering with
    QQuickWindow::setClearBeforeRendering().


    \section2 Exposure and Visibility

    When a QQuickWindow instance is deliberately hidden with hide() or
    setVisible(false), it will stop rendering and its scene graph and
    graphics context might be released. The sceneGraphInvalidated()
    signal will be emitted when this happens.

    \warning It is crucial that graphics operations and interaction with
    the scene graph happens exclusively on the rendering thread,
    primarily during the updatePaintNode() phase.

    \warning As signals related to rendering might be emitted from the
    rendering thread, connections should be made using
    Qt::DirectConnection.


    \section2 Resource Management

    QML will try to cache images and scene graph nodes to
    improve performance, but in some low-memory scenarios it might be
    required to aggressively release these resources. The
    releaseResources() can be used to force the clean up of certain
    resources. Calling releaseResources() may result in the entire
    scene graph and in the case of the OpenGL adaptation the associated
    context will be deleted. The sceneGraphInvalidated() signal will be
    emitted when this happens.

    \note All classes with QSG prefix should be used solely on the scene graph's
    rendering thread. See \l {Scene Graph and Rendering} for more information.

    \section2 Context and Surface Formats

    While it is possible to specify a QSurfaceFormat for every QQuickWindow by
    calling the member function setFormat(), windows may also be created from
    QML by using the Window and ApplicationWindow elements. In this case there
    is no C++ code involved in the creation of the window instance, yet
    applications may still wish to set certain surface format values, for
    example to request a given OpenGL version or profile. Such applications can
    call the static function QSurfaceFormat::setDefaultFormat() at startup. The
    specified format will be used for all Quick windows created afterwards.

    \sa {Scene Graph - OpenGL Under QML}
*/

/*!
    Constructs a window for displaying a QML scene with parent window \a parent.
*/
QQuickWindow::QQuickWindow(QWindow *parent)
    : QQuickWindow(*new QQuickWindowPrivate, parent)
{
}



/*!
    \internal
*/
QQuickWindow::QQuickWindow(QQuickWindowPrivate &dd, QWindow *parent)
    : QWindow(dd, parent)
{
    Q_D(QQuickWindow);
    d->init(this);
}

/*!
    \internal
*/
QQuickWindow::QQuickWindow(QQuickRenderControl *control)
    : QWindow(*(new QQuickWindowPrivate), nullptr)
{
    Q_D(QQuickWindow);
    d->init(this, control);
}

/*!
    \internal
*/
QQuickWindow::QQuickWindow(QQuickWindowPrivate &dd, QQuickRenderControl *control)
    : QWindow(dd, nullptr)
{
    Q_D(QQuickWindow);
    d->init(this, control);
}

/*!
    Destroys the window.
*/
QQuickWindow::~QQuickWindow()
{
    Q_D(QQuickWindow);

    if (d->renderControl) {
        QQuickRenderControlPrivate::get(d->renderControl)->windowDestroyed();
    } else if (d->windowManager) {
        d->windowManager->removeWindow(this);
        d->windowManager->windowDestroyed(this);
    }

    delete d->incubationController; d->incubationController = nullptr;
#if QT_CONFIG(quick_draganddrop)
    delete d->dragGrabber; d->dragGrabber = nullptr;
#endif
    QQuickRootItem *root = d->contentItem;
    d->contentItem = nullptr;
    delete root;
    qDeleteAll(d->pointerEventInstances);
    d->pointerEventInstances.clear();

    d->renderJobMutex.lock();
    qDeleteAll(d->beforeSynchronizingJobs);
    d->beforeSynchronizingJobs.clear();
    qDeleteAll(d->afterSynchronizingJobs);
    d->afterSynchronizingJobs.clear();
    qDeleteAll(d->beforeRenderingJobs);
    d->beforeRenderingJobs.clear();
    qDeleteAll(d->afterRenderingJobs);
    d->afterRenderingJobs.clear();
    qDeleteAll(d->afterSwapJobs);
    d->afterSwapJobs.clear();
    d->renderJobMutex.unlock();

    // It is important that the pixmap cache is cleaned up during shutdown.
    // Besides playing nice, this also solves a practical problem that
    // QQuickTextureFactory implementations in other libraries need
    // have their destructors loaded while they the library is still
    // loaded into memory.
    QQuickPixmap::purgeCache();
}

/*!
    This function tries to release redundant resources currently held by the QML scene.

    Calling this function might result in the scene graph and the OpenGL context used
    for rendering being released to release graphics memory. If this happens, the
    sceneGraphInvalidated() signal will be called, allowing users to clean up their
    own graphics resources. The setPersistentOpenGLContext() and setPersistentSceneGraph()
    functions can be used to prevent this from happening, if handling the cleanup is
    not feasible in the application, at the cost of higher memory usage.

    \sa sceneGraphInvalidated(), setPersistentOpenGLContext(), setPersistentSceneGraph()
 */

void QQuickWindow::releaseResources()
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->releaseResources(this);
    QQuickPixmap::purgeCache();
}



/*!
    Sets whether the OpenGL context should be preserved, and cannot be
    released until the last window is deleted, to \a persistent. The
    default value is true.

    The OpenGL context can be released to free up graphics resources
    when the window is obscured, hidden or not rendering. When this
    happens is implementation specific.

    The QOpenGLContext::aboutToBeDestroyed() signal is emitted from
    the QQuickWindow::openglContext() when the OpenGL context is about
    to be released.  The QQuickWindow::sceneGraphInitialized() signal
    is emitted when a new OpenGL context is created for this
    window. Make a Qt::DirectConnection to these signals to be
    notified.

    The OpenGL context is still released when the last QQuickWindow is
    deleted.

    \note This only has an effect when using the default OpenGL scene
    graph adaptation.

    \sa setPersistentSceneGraph(),
    QOpenGLContext::aboutToBeDestroyed(), sceneGraphInitialized()
 */

void QQuickWindow::setPersistentOpenGLContext(bool persistent)
{
    Q_D(QQuickWindow);
    d->persistentGLContext = persistent;
}



/*!
    Returns whether the OpenGL context can be released during the
    lifetime of the QQuickWindow.

    \note This is a hint. When and how this happens is implementation
    specific.  It also only has an effect when using the default OpenGL
    scene graph adaptation
 */

bool QQuickWindow::isPersistentOpenGLContext() const
{
    Q_D(const QQuickWindow);
    return d->persistentGLContext;
}



/*!
    Sets whether the scene graph nodes and resources are \a persistent.
    Persistent means the nodes and resources cannot be released.
    The default value is \c true.

    The scene graph nodes and resources can be released to free up
    graphics resources when the window is obscured, hidden or not
    rendering. When this happens is implementation specific.

    The QQuickWindow::sceneGraphInvalidated() signal is emitted when
    cleanup occurs. The QQuickWindow::sceneGraphInitialized() signal
    is emitted when a new scene graph is recreated for this
    window. Make a Qt::DirectConnection to these signals to be
    notified.

    The scene graph nodes and resources are still released when the
    last QQuickWindow is deleted.

    \sa setPersistentOpenGLContext(),
    sceneGraphInvalidated(), sceneGraphInitialized()
 */

void QQuickWindow::setPersistentSceneGraph(bool persistent)
{
    Q_D(QQuickWindow);
    d->persistentSceneGraph = persistent;
}



/*!
    Returns whether the scene graph nodes and resources can be
    released during the lifetime of this QQuickWindow.

    \note This is a hint. When and how this happens is implementation
    specific.
 */

bool QQuickWindow::isPersistentSceneGraph() const
{
    Q_D(const QQuickWindow);
    return d->persistentSceneGraph;
}




/*!
    \qmlattachedproperty Item Window::contentItem
    \since 5.4

    This attached property holds the invisible root item of the scene or
    \c null if the item is not in a window. The Window attached property
    can be attached to any Item.
*/

/*!
    \property QQuickWindow::contentItem
    \brief The invisible root item of the scene.

  A QQuickWindow always has a single invisible root item containing all of its content.
  To add items to this window, reparent the items to the contentItem or to an existing
  item in the scene.
*/
QQuickItem *QQuickWindow::contentItem() const
{
    Q_D(const QQuickWindow);

    return d->contentItem;
}

/*!
    \property QQuickWindow::activeFocusItem

    \brief The item which currently has active focus or \c null if there is
    no item with active focus.
*/
QQuickItem *QQuickWindow::activeFocusItem() const
{
    Q_D(const QQuickWindow);

    return d->activeFocusItem;
}

/*!
  \internal
  \reimp
*/
QObject *QQuickWindow::focusObject() const
{
    Q_D(const QQuickWindow);

    if (d->activeFocusItem)
        return d->activeFocusItem;
    return const_cast<QQuickWindow*>(this);
}


/*!
  Returns the item which currently has the mouse grab.
*/
QQuickItem *QQuickWindow::mouseGrabberItem() const
{
    Q_D(const QQuickWindow);

    if (d->isDeliveringTouchAsMouse()) {
        if (QQuickPointerEvent *event = d->queryPointerEventInstance(d->touchMouseDevice)) {
            auto point = event->pointById(d->touchMouseId);
            return point ? point->grabberItem() : nullptr;
        }
    } else if (QQuickPointerEvent *event = d->queryPointerEventInstance(QQuickPointerDevice::genericMouseDevice())) {
        Q_ASSERT(event->pointCount());
        return event->point(0)->grabberItem();
    }
    return nullptr;
}


bool QQuickWindowPrivate::clearHover(ulong timestamp)
{
    Q_Q(QQuickWindow);
    if (hoverItems.isEmpty())
        return false;

    QPointF pos = q->mapFromGlobal(QGuiApplicationPrivate::lastCursorPosition.toPoint());

    bool accepted = false;
    for (QQuickItem* item : qAsConst(hoverItems)) {
        accepted = sendHoverEvent(QEvent::HoverLeave, item, pos, pos, QGuiApplication::keyboardModifiers(), timestamp, true) || accepted;
#if QT_CONFIG(cursor)
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        if (itemPrivate->hasPointerHandlers()) {
            pos = q->mapFromGlobal(QCursor::pos());
            QQuickPointerEvent *pointerEvent = pointerEventInstance(QQuickPointerDevice::genericMouseDevice(), QEvent::MouseMove);
            pointerEvent->point(0)->reset(Qt::TouchPointMoved, pos, quint64(1) << 24 /* mouse has device ID 1 */, timestamp, QVector2D());
            pointerEvent->point(0)->setAccepted(true);
            pointerEvent->localize(item);
            for (QQuickPointerHandler *h : itemPrivate->extra->pointerHandlers)
                if (QQuickHoverHandler *hh = qmlobject_cast<QQuickHoverHandler *>(h))
                    hh->handlePointerEvent(pointerEvent);
        }
#endif
    }
    hoverItems.clear();
    return accepted;
}

/*! \reimp */
bool QQuickWindow::event(QEvent *e)
{
    Q_D(QQuickWindow);

    switch (e->type()) {

    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd: {
        QTouchEvent *touch = static_cast<QTouchEvent*>(e);
        d->handleTouchEvent(touch);
        if (Q_LIKELY(QCoreApplication::testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents))) {
            // we consume all touch events ourselves to avoid duplicate
            // mouse delivery by QtGui mouse synthesis
            e->accept();
        }
        return true;
    }
        break;
    case QEvent::TouchCancel:
        // return in order to avoid the QWindow::event below
        return d->deliverTouchCancelEvent(static_cast<QTouchEvent*>(e));
        break;
    case QEvent::Enter: {
        if (!d->contentItem)
            return false;
        QEnterEvent *enter = static_cast<QEnterEvent*>(e);
        bool accepted = enter->isAccepted();
        bool delivered = d->deliverHoverEvent(d->contentItem, enter->windowPos(), d->lastMousePosition,
            QGuiApplication::keyboardModifiers(), 0L, accepted);
        d->lastMousePosition = enter->windowPos();
        enter->setAccepted(accepted);
#if QT_CONFIG(cursor)
        d->updateCursor(mapFromGlobal(QCursor::pos()));
#endif
        return delivered;
    }
        break;
    case QEvent::Leave:
        d->clearHover();
        d->lastMousePosition = QPointF();
        break;
#if QT_CONFIG(quick_draganddrop)
    case QEvent::DragEnter:
    case QEvent::DragLeave:
    case QEvent::DragMove:
    case QEvent::Drop:
        d->deliverDragEvent(d->dragGrabber, e);
        break;
#endif
    case QEvent::WindowDeactivate:
        if (d->contentItem)
            d->contentItem->windowDeactivateEvent();
        break;
    case QEvent::Close: {
        // TOOD Qt 6 (binary incompatible)
        // closeEvent(static_cast<QCloseEvent *>(e));
        QQuickCloseEvent qev;
        qev.setAccepted(e->isAccepted());
        emit closing(&qev);
        e->setAccepted(qev.isAccepted());
        } break;
    case QEvent::PlatformSurface:
        if ((static_cast<QPlatformSurfaceEvent *>(e))->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed) {
            // Ensure that the rendering thread is notified before
            // the QPlatformWindow is destroyed.
            if (d->windowManager)
                d->windowManager->hide(this);
        }
        break;
    case QEvent::FocusAboutToChange:
#if QT_CONFIG(im)
        if (d->activeFocusItem)
            qGuiApp->inputMethod()->commit();
#endif
        if (mouseGrabberItem())
            mouseGrabberItem()->ungrabMouse();
        break;
    case QEvent::UpdateRequest: {
        if (d->windowManager)
            d->windowManager->handleUpdateRequest(this);
        break;
    }
#if QT_CONFIG(gestures)
    case QEvent::NativeGesture:
        d->deliverSinglePointEventUntilAccepted(d->pointerEventInstance(e));
        break;
#endif
    case QEvent::ShortcutOverride:
        if (d->activeFocusItem)
            QCoreApplication::sendEvent(d->activeFocusItem, e);
        return true;
    case QEvent::LanguageChange:
        if (d->contentItem)
            QCoreApplication::sendEvent(d->contentItem, e);
        break;
    case QEvent::InputMethod:
    case QEvent::InputMethodQuery:
        {
            QQuickItem *target = d->activeFocusItem;
            // while an input method delivers the event, this window might still be inactive
            if (!target) {
                target = d->contentItem;
                if (!target || !target->isEnabled())
                    break;
                // see setFocusInScope for a similar loop
                while (target->isFocusScope() && target->scopedFocusItem() && target->scopedFocusItem()->isEnabled())
                    target = target->scopedFocusItem();
            }
            if (target) {
                QCoreApplication::sendEvent(target, e);
                return true;
            }
        }
        break;
    default:
        break;
    }

    if (e->type() == QEvent::Type(QQuickWindowPrivate::FullUpdateRequest))
        update();
    else if (e->type() == QEvent::Type(QQuickWindowPrivate::TriggerContextCreationFailure))
        d->windowManager->handleContextCreationFailure(this);

    return QWindow::event(e);
}

/*! \reimp */
void QQuickWindow::keyPressEvent(QKeyEvent *e)
{
    Q_D(QQuickWindow);
    Q_QUICK_INPUT_PROFILE(QQuickProfiler::Key, QQuickProfiler::InputKeyPress, e->key(),
                          e->modifiers());
    d->deliverKeyEvent(e);
}

/*! \reimp */
void QQuickWindow::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QQuickWindow);
    Q_QUICK_INPUT_PROFILE(QQuickProfiler::Key, QQuickProfiler::InputKeyRelease, e->key(),
                          e->modifiers());
    d->deliverKeyEvent(e);
}

void QQuickWindowPrivate::deliverKeyEvent(QKeyEvent *e)
{
    if (activeFocusItem) {
        QQuickItem *item = activeFocusItem;

        // In case of generated event, trigger ShortcutOverride event
        if (e->type() == QEvent::KeyPress && e->spontaneous() == false)
                qt_sendShortcutOverrideEvent(item, e->timestamp(),
                                         e->key(), e->modifiers(), e->text(),
                                         e->isAutoRepeat(), e->count());

        e->accept();
        QCoreApplication::sendEvent(item, e);
        while (!e->isAccepted() && (item = item->parentItem())) {
            e->accept();
            QCoreApplication::sendEvent(item, e);
        }
    }
}

QMouseEvent *QQuickWindowPrivate::cloneMouseEvent(QMouseEvent *event, QPointF *transformedLocalPos)
{
    int caps = QGuiApplicationPrivate::mouseEventCaps(event);
    QVector2D velocity = QGuiApplicationPrivate::mouseEventVelocity(event);
    QMouseEvent *me = new QMouseEvent(event->type(),
                                      transformedLocalPos ? *transformedLocalPos : event->localPos(),
                                      event->windowPos(), event->screenPos(),
                                      event->button(), event->buttons(), event->modifiers());
    QGuiApplicationPrivate::setMouseEventCapsAndVelocity(me, caps, velocity);
    QGuiApplicationPrivate::setMouseEventSource(me, QGuiApplicationPrivate::mouseEventSource(event));
    me->setTimestamp(event->timestamp());
    return me;
}

void QQuickWindowPrivate::deliverToPassiveGrabbers(const QVector<QPointer <QQuickPointerHandler> > &passiveGrabbers,
                                                   QQuickPointerEvent *pointerEvent)
{
    const QVector<QQuickPointerHandler *> &eventDeliveryTargets = pointerEvent->device()->eventDeliveryTargets();
    QVarLengthArray<QPair<QQuickItem *, bool>, 4> sendFilteredPointerEventResult;
    hasFiltered.clear();
    for (auto handler : passiveGrabbers) {
        // a null pointer in passiveGrabbers is unlikely, unless the grabbing handler was deleted dynamically
        if (Q_LIKELY(handler) && !eventDeliveryTargets.contains(handler)) {
            bool alreadyFiltered = false;
            QQuickItem *par = handler->parentItem();

            // see if we already have sent a filter event to the parent
            auto it = std::find_if(sendFilteredPointerEventResult.begin(), sendFilteredPointerEventResult.end(),
                                        [par](const QPair<QQuickItem *, bool> &pair) { return pair.first == par; });
            if (it != sendFilteredPointerEventResult.end()) {
                // Yes, the event was already filtered to that parent, do not call it again but use
                // the result of the previous call to determine if we should call the handler.
                alreadyFiltered = it->second;
            } else {
                alreadyFiltered = sendFilteredPointerEvent(pointerEvent, par);
                sendFilteredPointerEventResult << qMakePair<QQuickItem*, bool>(par, alreadyFiltered);
            }
            if (!alreadyFiltered) {
                pointerEvent->localize(handler->parentItem());
                handler->handlePointerEvent(pointerEvent);
            }
        }
    }
}



void QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent *pointerEvent)
{
    Q_Q(QQuickWindow);
    auto point = pointerEvent->point(0);
    lastMousePosition = point->scenePosition();
    const bool mouseIsReleased = (point->state() == QQuickEventPoint::Released && pointerEvent->buttons() == Qt::NoButton);
    QQuickItem *grabberItem = point->grabberItem();
    if (!grabberItem && isDeliveringTouchAsMouse())
        grabberItem = q->mouseGrabberItem();

    if (grabberItem) {
        bool handled = false;
        hasFiltered.clear();
        if (sendFilteredPointerEvent(pointerEvent, grabberItem))
            handled = true;
        // if the grabber is an Item:
        // if the update consists of changing button state, don't accept it unless
        // the button is one in which the grabber is interested
        Qt::MouseButtons acceptedButtons = grabberItem->acceptedMouseButtons();
        if (!handled && pointerEvent->button() != Qt::NoButton && acceptedButtons
                && !(acceptedButtons & pointerEvent->button())) {
            pointerEvent->setAccepted(false);
            handled = true;
        }

        // send update
        if (!handled) {
            QPointF localPos = grabberItem->mapFromScene(lastMousePosition);
            auto me = pointerEvent->asMouseEvent(localPos);
            me->accept();
            QCoreApplication::sendEvent(grabberItem, me);
            point->setAccepted(me->isAccepted());
        }

        // release event: ungrab if no buttons are pressed anymore
        if (mouseIsReleased)
            removeGrabber(grabberItem, true, isDeliveringTouchAsMouse());
        deliverToPassiveGrabbers(point->passiveGrabbers(), pointerEvent);
    } else if (auto handler = point->grabberPointerHandler()) {
        pointerEvent->localize(handler->parentItem());
        hasFiltered.clear();
        if (!sendFilteredPointerEvent(pointerEvent, handler->parentItem()))
            handler->handlePointerEvent(pointerEvent);
        if (mouseIsReleased)
            point->setGrabberPointerHandler(nullptr, true);
        deliverToPassiveGrabbers(point->passiveGrabbers(), pointerEvent);
    } else {
        bool delivered = false;
        if (pointerEvent->isPressEvent()) {
            // send initial press
            delivered = deliverPressOrReleaseEvent(pointerEvent);
        } else if (pointerEvent->device()->type() == QQuickPointerDevice::Mouse) {
            // if this is an update or release from an actual mouse,
            // and the point wasn't grabbed, deliver only to PointerHandlers:
            // passive grabbers first, then the rest
            deliverToPassiveGrabbers(point->passiveGrabbers(), pointerEvent);

            // If some points weren't grabbed, deliver to non-grabber PointerHandlers in reverse paint order
            if (!pointerEvent->allPointsGrabbed() && pointerEvent->buttons()) {
                QVector<QQuickItem *> targetItems = pointerTargets(contentItem, point, false, false);
                for (QQuickItem *item : targetItems) {
                    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
                    if (!itemPrivate->extra.isAllocated() || itemPrivate->extra->pointerHandlers.isEmpty())
                        continue;
                    pointerEvent->localize(item);
                    hasFiltered.clear();
                    if (!sendFilteredPointerEvent(pointerEvent, item)) {
                        if (itemPrivate->handlePointerEvent(pointerEvent, true)) // avoid re-delivering to grabbers
                            delivered = true;
                    }
                    if (point->exclusiveGrabber())
                        break;
                }
            }
        }

        if (!delivered)
            // make sure not to accept unhandled events
            pointerEvent->setAccepted(false);
    }
}

bool QQuickWindowPrivate::sendHoverEvent(QEvent::Type type, QQuickItem *item,
                                      const QPointF &scenePos, const QPointF &lastScenePos,
                                      Qt::KeyboardModifiers modifiers, ulong timestamp,
                                      bool accepted)
{
    const QTransform transform = QQuickItemPrivate::get(item)->windowToItemTransform();

    //create copy of event
    QHoverEvent hoverEvent(type, transform.map(scenePos), transform.map(lastScenePos), modifiers);
    hoverEvent.setTimestamp(timestamp);
    hoverEvent.setAccepted(accepted);

    hasFiltered.clear();
    if (sendFilteredMouseEvent(&hoverEvent, item, item->parentItem()))
        return true;

    QCoreApplication::sendEvent(item, &hoverEvent);

    return hoverEvent.isAccepted();
}

bool QQuickWindowPrivate::deliverHoverEvent(QQuickItem *item, const QPointF &scenePos, const QPointF &lastScenePos,
                                         Qt::KeyboardModifiers modifiers, ulong timestamp, bool &accepted)
{
    Q_Q(QQuickWindow);
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        QPointF p = item->mapFromScene(scenePos);
        if (!item->contains(p))
            return false;
    }

    qCDebug(DBG_HOVER_TRACE) << q << item << scenePos << lastScenePos << "subtreeHoverEnabled" << itemPrivate->subtreeHoverEnabled;
    if (itemPrivate->subtreeHoverEnabled) {
        QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
        for (int ii = children.count() - 1; ii >= 0; --ii) {
            QQuickItem *child = children.at(ii);
            if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
                continue;
            if (deliverHoverEvent(child, scenePos, lastScenePos, modifiers, timestamp, accepted))
                return true;
        }
    }

    if (itemPrivate->hasPointerHandlers()) {
        QQuickPointerEvent *pointerEvent = pointerEventInstance(QQuickPointerDevice::genericMouseDevice(), QEvent::MouseMove);
        pointerEvent->point(0)->reset(Qt::TouchPointMoved, scenePos, quint64(1) << 24 /* mouse has device ID 1 */, timestamp, QVector2D());
        pointerEvent->point(0)->setAccepted(true);
        pointerEvent->localize(item);
        for (QQuickPointerHandler *h : itemPrivate->extra->pointerHandlers)
            if (QQuickHoverHandler *hh = qmlobject_cast<QQuickHoverHandler *>(h))
                hh->handlePointerEvent(pointerEvent);
    }

    if (itemPrivate->hoverEnabled) {
        QPointF p = item->mapFromScene(scenePos);
        if (item->contains(p)) {
            if (!hoverItems.isEmpty() && hoverItems.at(0) == item) {
                //move
                accepted = sendHoverEvent(QEvent::HoverMove, item, scenePos, lastScenePos, modifiers, timestamp, accepted);
            } else {
                QList<QQuickItem *> itemsToHover;
                QQuickItem* parent = item;
                itemsToHover << item;
                while ((parent = parent->parentItem()))
                    itemsToHover << parent;

                // Leaving from previous hovered items until we reach the item or one of its ancestors.
                while (!hoverItems.isEmpty() && !itemsToHover.contains(hoverItems.at(0))) {
                    QQuickItem *hoverLeaveItem = hoverItems.takeFirst();
                    sendHoverEvent(QEvent::HoverLeave, hoverLeaveItem, scenePos, lastScenePos, modifiers, timestamp, accepted);
                }

                if (!hoverItems.isEmpty() && hoverItems.at(0) == item) {//Not entering a new Item
                    // ### Shouldn't we send moves for the parent items as well?
                    accepted = sendHoverEvent(QEvent::HoverMove, item, scenePos, lastScenePos, modifiers, timestamp, accepted);
                } else {
                    // Enter items that are not entered yet.
                    int startIdx = -1;
                    if (!hoverItems.isEmpty())
                        startIdx = itemsToHover.indexOf(hoverItems.at(0)) - 1;
                    if (startIdx == -1)
                        startIdx = itemsToHover.count() - 1;

                    for (int i = startIdx; i >= 0; i--) {
                        QQuickItem *itemToHover = itemsToHover.at(i);
                        QQuickItemPrivate *itemToHoverPrivate = QQuickItemPrivate::get(itemToHover);
                        // The item may be about to be deleted or reparented to another window
                        // due to another hover event delivered in this function. If that is the
                        // case, sending a hover event here will cause a crash or other bad
                        // behavior when the leave event is generated. Checking
                        // itemToHoverPrivate->window here prevents that case.
                        if (itemToHoverPrivate->window == q && itemToHoverPrivate->hoverEnabled) {
                            hoverItems.prepend(itemToHover);
                            sendHoverEvent(QEvent::HoverEnter, itemToHover, scenePos, lastScenePos, modifiers, timestamp, accepted);
                        }
                    }
                }
            }
            return true;
        }
    }

    return false;
}

// Simple delivery of non-mouse, non-touch Pointer Events: visit the items and handlers
// in the usual reverse-paint-order until propagation is stopped
bool QQuickWindowPrivate::deliverSinglePointEventUntilAccepted(QQuickPointerEvent *event)
{
    Q_ASSERT(event->pointCount() == 1);
    QQuickEventPoint *point = event->point(0);
    QVector<QQuickItem *> targetItems = pointerTargets(contentItem, point, false, false);

    for (QQuickItem *item : targetItems) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        event->localize(item);
        // Let Pointer Handlers have the first shot
        itemPrivate->handlePointerEvent(event);
        if (point->isAccepted())
            return true;
        QPointF g = item->window()->mapToGlobal(point->scenePosition().toPoint());
#if QT_CONFIG(wheelevent)
        // Let the Item have a chance to handle it
        if (QQuickPointerScrollEvent *pse = event->asPointerScrollEvent()) {
            QWheelEvent wheel(point->position(), g, pse->pixelDelta().toPoint(), pse->angleDelta().toPoint(),
                              pse->buttons(), pse->modifiers(), pse->phase(),
                              pse->isInverted(), pse->synthSource());
            wheel.setTimestamp(pse->timestamp());
            wheel.accept();
            QCoreApplication::sendEvent(item, &wheel);
            if (wheel.isAccepted()) {
                qCDebug(lcWheelTarget) << &wheel << "->" << item;
                event->setAccepted(true);
                return true;
            }
        }
#endif
#if QT_CONFIG(gestures)
        if (QQuickPointerNativeGestureEvent *pnge = event->asPointerNativeGestureEvent()) {
            QNativeGestureEvent nge(pnge->type(), pnge->device()->qTouchDevice(), point->position(), point->scenePosition(), g,
                                    pnge->value(), 0L, 0L); // TODO can't copy things I can't access
            nge.accept();
            QCoreApplication::sendEvent(item, &nge);
            if (nge.isAccepted()) {
                qCDebug(lcGestureTarget) << &nge << "->" << item;
                event->setAccepted(true);
                return true;
            }
        }
#endif // gestures
    }

    return false; // it wasn't handled
}

#if QT_CONFIG(wheelevent)
/*! \reimp */
void QQuickWindow::wheelEvent(QWheelEvent *event)
{
    Q_D(QQuickWindow);
    Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseWheel,
                          event->angleDelta().x(), event->angleDelta().y());

    qCDebug(DBG_MOUSE) << "QQuickWindow::wheelEvent()" << event->pixelDelta() << event->angleDelta() << event->phase();

    //if the actual wheel event was accepted, accept the compatibility wheel event and return early
    if (d->lastWheelEventAccepted && event->angleDelta().isNull() && event->phase() == Qt::ScrollUpdate)
        return;

    event->ignore();
    d->deliverPointerEvent(d->pointerEventInstance(event));
    d->lastWheelEventAccepted = event->isAccepted();
}
#endif // wheelevent

#if QT_CONFIG(tabletevent)
/*! \reimp */
void QQuickWindow::tabletEvent(QTabletEvent *event)
{
    Q_D(QQuickWindow);
    qCDebug(lcTablet) << event;
    // TODO Qt 6: make sure TabletEnterProximity and TabletLeaveProximity are delivered here
    d->deliverPointerEvent(d->pointerEventInstance(event));
}
#endif // tabletevent

bool QQuickWindowPrivate::deliverTouchCancelEvent(QTouchEvent *event)
{
    qCDebug(DBG_TOUCH) << event;
    Q_Q(QQuickWindow);

    if (QQuickItem *grabber = q->mouseGrabberItem())
        sendUngrabEvent(grabber, true);
    cancelTouchMouseSynthesis();

    // A TouchCancel event will typically not contain any points.
    // Deliver it to all items and handlers that have active touches.
    QQuickPointerEvent *pointerEvent = pointerEventInstance(QQuickPointerDevice::touchDevice(event->device()));
    for (int i = 0; i < pointerEvent->pointCount(); ++i)
        pointerEvent->point(i)->cancelExclusiveGrabImpl(event);

    // The next touch event can only be a TouchBegin, so clean up.
    pointerEvent->clearGrabbers();
    return true;
}

void QQuickWindowPrivate::deliverDelayedTouchEvent()
{
    // Deliver and delete delayedTouch.
    // Set delayedTouch to 0 before delivery to avoid redelivery in case of
    // event loop recursions (e.g if it the touch starts a dnd session).
    QScopedPointer<QTouchEvent> e(delayedTouch.take());
    deliverPointerEvent(pointerEventInstance(e.data()));
}

bool QQuickWindowPrivate::compressTouchEvent(QTouchEvent *event)
{
    Q_Q(QQuickWindow);
    Qt::TouchPointStates states = event->touchPointStates();
    if (((states & (Qt::TouchPointMoved | Qt::TouchPointStationary)) == 0)
        || ((states & (Qt::TouchPointPressed | Qt::TouchPointReleased)) != 0)) {
        // we can only compress something that isn't a press or release
        return false;
    }

    if (!delayedTouch) {
        delayedTouch.reset(new QTouchEvent(event->type(), event->device(), event->modifiers(), event->touchPointStates(), event->touchPoints()));
        delayedTouch->setTimestamp(event->timestamp());
        if (renderControl)
            QQuickRenderControlPrivate::get(renderControl)->maybeUpdate();
        else if (windowManager)
            windowManager->maybeUpdate(q);
        return true;
    }

    // check if this looks like the last touch event
    if (delayedTouch->type() == event->type() &&
            delayedTouch->device() == event->device() &&
            delayedTouch->modifiers() == event->modifiers() &&
            delayedTouch->touchPoints().count() == event->touchPoints().count())
    {
        // possible match.. is it really the same?
        bool mismatch = false;

        QList<QTouchEvent::TouchPoint> tpts = event->touchPoints();
        Qt::TouchPointStates states;
        for (int i = 0; i < event->touchPoints().count(); ++i) {
            const QTouchEvent::TouchPoint &tp = tpts.at(i);
            const QTouchEvent::TouchPoint &tpDelayed = delayedTouch->touchPoints().at(i);
            if (tp.id() != tpDelayed.id()) {
                mismatch = true;
                break;
            }

            if (tpDelayed.state() == Qt::TouchPointMoved && tp.state() == Qt::TouchPointStationary)
                tpts[i].setState(Qt::TouchPointMoved);
            tpts[i].setLastPos(tpDelayed.lastPos());
            tpts[i].setLastScenePos(tpDelayed.lastScenePos());
            tpts[i].setLastScreenPos(tpDelayed.lastScreenPos());
            tpts[i].setLastNormalizedPos(tpDelayed.lastNormalizedPos());

            states |= tpts.at(i).state();
        }

        // matching touch event? then merge the new event into the old one
        if (!mismatch) {
            delayedTouch->setTouchPoints(tpts);
            delayedTouch->setTimestamp(event->timestamp());
            return true;
        }
    }

    // merging wasn't possible, so deliver the delayed event first, and then delay this one
    deliverDelayedTouchEvent();
    delayedTouch.reset(new QTouchEvent(event->type(), event->device(), event->modifiers(), event->touchPointStates(), event->touchPoints()));
    delayedTouch->setTimestamp(event->timestamp());
    return true;
}

// entry point for touch event delivery:
// - translate the event to window coordinates
// - compress the event instead of delivering it if applicable
// - call deliverTouchPoints to actually dispatch the points
void QQuickWindowPrivate::handleTouchEvent(QTouchEvent *event)
{
    translateTouchEvent(event);
    if (event->touchPoints().size()) {
        auto point = event->touchPoints().at(0);
        if (point.state() == Qt::TouchPointReleased) {
            lastMousePosition = QPointF();
        } else {
            lastMousePosition = point.pos();
        }
    }

    qCDebug(DBG_TOUCH) << event;

    static bool qquickwindow_no_touch_compression = qEnvironmentVariableIsSet("QML_NO_TOUCH_COMPRESSION");

    if (qquickwindow_no_touch_compression || pointerEventRecursionGuard) {
        deliverPointerEvent(pointerEventInstance(event));
        return;
    }

    if (!compressTouchEvent(event)) {
        if (delayedTouch)
            deliverDelayedTouchEvent();
        deliverPointerEvent(pointerEventInstance(event));
    }
}

/*! \reimp */
void QQuickWindow::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}
/*! \reimp */
void QQuickWindow::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}
/*! \reimp */
void QQuickWindow::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}
/*! \reimp */
void QQuickWindow::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}

void QQuickWindowPrivate::handleMouseEvent(QMouseEvent *event)
{
    if (event->source() == Qt::MouseEventSynthesizedBySystem) {
        event->accept();
        return;
    }
    qCDebug(DBG_MOUSE) << "QQuickWindow::handleMouseEvent()" << event->type() << event->localPos() << event->button() << event->buttons();

    switch (event->type()) {
    case QEvent::MouseButtonPress:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMousePress, event->button(),
                              event->buttons());
        deliverPointerEvent(pointerEventInstance(event));
        break;
    case QEvent::MouseButtonRelease:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseRelease, event->button(),
                              event->buttons());
        deliverPointerEvent(pointerEventInstance(event));
        break;
    case QEvent::MouseButtonDblClick:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseDoubleClick,
                              event->button(), event->buttons());
        if (allowDoubleClick)
            deliverPointerEvent(pointerEventInstance(event));
        break;
    case QEvent::MouseMove:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseMove,
                              event->localPos().x(), event->localPos().y());

        qCDebug(DBG_HOVER_TRACE) << this;

    #if QT_CONFIG(cursor)
        updateCursor(event->windowPos());
    #endif

        if (!pointerEventInstance(QQuickPointerDevice::genericMouseDevice())->point(0)->exclusiveGrabber()) {
            QPointF last = lastMousePosition.isNull() ? event->windowPos() : lastMousePosition;
            lastMousePosition = event->windowPos();

            bool accepted = event->isAccepted();
            bool delivered = deliverHoverEvent(contentItem, event->windowPos(), last, event->modifiers(), event->timestamp(), accepted);
            if (!delivered) {
                //take care of any exits
                accepted = clearHover(event->timestamp());
            }
            event->setAccepted(accepted);
        }
        deliverPointerEvent(pointerEventInstance(event));
        break;
    default:
        Q_ASSERT(false);
        break;
    }
}

void QQuickWindowPrivate::flushFrameSynchronousEvents()
{
    Q_Q(QQuickWindow);

    if (delayedTouch) {
        deliverDelayedTouchEvent();

        // Touch events which constantly start animations (such as a behavior tracking
        // the mouse point) need animations to start.
        QQmlAnimationTimer *ut = QQmlAnimationTimer::instance();
        if (ut && ut->hasStartAnimationPending())
            ut->startAnimations();
    }

    // In webOS we already have the alternative to the issue that this
    // wanted to address and thus skipping this part won't break anything.
#if !defined(Q_OS_WEBOS)
    // Once per frame, if any items are dirty, send a synthetic hover,
    // in case items have changed position, visibility, etc.
    // For instance, during animation (including the case of a ListView
    // whose delegates contain MouseAreas), a MouseArea needs to know
    // whether it has moved into a position where it is now under the cursor.
    if (!q->mouseGrabberItem() && !lastMousePosition.isNull() && dirtyItemList) {
        bool accepted = false;
        bool delivered = deliverHoverEvent(contentItem, lastMousePosition, lastMousePosition, QGuiApplication::keyboardModifiers(), 0, accepted);
        if (!delivered)
            clearHover(); // take care of any exits
    }
#endif
}

QQuickPointerEvent *QQuickWindowPrivate::queryPointerEventInstance(QQuickPointerDevice *device, QEvent::Type eventType) const
{
    // Search for a matching reusable event object.
    for (QQuickPointerEvent *e : pointerEventInstances) {
        // If device can generate native gestures (e.g. a trackpad), there might be multiple QQuickPointerEvents:
        // QQuickPointerNativeGestureEvent, QQuickPointerScrollEvent, and QQuickPointerTouchEvent.
        // Use eventType to disambiguate.
#if QT_CONFIG(gestures)
        if ((eventType == QEvent::NativeGesture) != bool(e->asPointerNativeGestureEvent()))
            continue;
#endif
        if ((eventType == QEvent::Wheel) != bool(e->asPointerScrollEvent()))
            continue;
        // Otherwise we assume there's only one event type per device.
        // More disambiguation tests might need to be added above if that changes later.
        if (e->device() == device)
            return e;
    }
    return nullptr;
}

QQuickPointerEvent *QQuickWindowPrivate::pointerEventInstance(QQuickPointerDevice *device, QEvent::Type eventType) const
{
    QQuickPointerEvent *ev = queryPointerEventInstance(device, eventType);
    if (ev)
        return ev;
    QQuickWindow *q = const_cast<QQuickWindow*>(q_func());
    switch (device->type()) {
    case QQuickPointerDevice::Mouse:
        // QWindowSystemInterface::handleMouseEvent() does not take a device parameter:
        // we assume all mouse events come from one mouse (the "core pointer").
        // So when the event is a mouse event, device == QQuickPointerDevice::genericMouseDevice()
        if (eventType == QEvent::Wheel)
            ev = new QQuickPointerScrollEvent(q, device);
        else
            ev = new QQuickPointerMouseEvent(q, device);
        break;
    case QQuickPointerDevice::TouchPad:
    case QQuickPointerDevice::TouchScreen:
#if QT_CONFIG(gestures)
        if (eventType == QEvent::NativeGesture)
            ev = new QQuickPointerNativeGestureEvent(q, device);
        else // assume QEvent::Type is one of TouchBegin/Update/End
#endif
            ev = new QQuickPointerTouchEvent(q, device);
        break;
#if QT_CONFIG(tabletevent)
    case QQuickPointerDevice::Stylus:
    case QQuickPointerDevice::Airbrush:
    case QQuickPointerDevice::Puck:
        ev = new QQuickPointerTabletEvent(q, device);
        break;
#endif
    default:
        break;
    }
    pointerEventInstances << ev;
    return ev;
}

/*!
    \internal
    Returns a QQuickPointerEvent instance suitable for wrapping and delivering \a event.

    There is a unique instance per QQuickPointerDevice, which is determined
    from \a event's device.
*/
QQuickPointerEvent *QQuickWindowPrivate::pointerEventInstance(QEvent *event) const
{
    QQuickPointerDevice *dev = nullptr;
    switch (event->type()) {
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::MouseMove:
    case QEvent::Wheel:
        dev = QQuickPointerDevice::genericMouseDevice();
        break;
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
    case QEvent::TouchCancel:
        dev = QQuickPointerDevice::touchDevice(static_cast<QTouchEvent *>(event)->device());
        break;
#if QT_CONFIG(tabletevent)
    case QEvent::TabletPress:
    case QEvent::TabletMove:
    case QEvent::TabletRelease:
    case QEvent::TabletEnterProximity:
    case QEvent::TabletLeaveProximity:
        dev = QQuickPointerDevice::tabletDevice(static_cast<QTabletEvent *>(event));
        break;
#endif
#if QT_CONFIG(gestures)
    case QEvent::NativeGesture:
        dev = QQuickPointerDevice::touchDevice(static_cast<QNativeGestureEvent *>(event)->device());
        break;
#endif
    default:
        break;
    }

    Q_ASSERT(dev);
    return pointerEventInstance(dev, event->type())->reset(event);
}

void QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent *event)
{
    Q_Q(QQuickWindow);
    // If users spin the eventloop as a result of event delivery, we disable
    // event compression and send events directly. This is because we consider
    // the usecase a bit evil, but we at least don't want to lose events.
    ++pointerEventRecursionGuard;

    skipDelivery.clear();
    if (event->asPointerMouseEvent()) {
        deliverMouseEvent(event->asPointerMouseEvent());
        // failsafe: never allow any kind of grab to persist after release
        if (event->isReleaseEvent() && event->buttons() == Qt::NoButton) {
            QQuickItem *oldGrabber = q->mouseGrabberItem();
            event->clearGrabbers();
            sendUngrabEvent(oldGrabber, false);
        }
    } else if (event->asPointerTouchEvent()) {
        deliverTouchEvent(event->asPointerTouchEvent());
    } else {
        deliverSinglePointEventUntilAccepted(event);
        // If any handler got interested in the tablet event, we don't want to receive a synth-mouse event from QtGui
        // TODO Qt 6: QTabletEvent will be accepted by default, like other events
        if (event->asPointerTabletEvent() &&
                (!event->point(0)->passiveGrabbers().isEmpty() || event->point(0)->exclusiveGrabber()))
            event->setAccepted(true);
    }

    event->reset(nullptr);

    --pointerEventRecursionGuard;
}

// check if item or any of its child items contain the point, or if any pointer handler "wants" the point
// FIXME: should this be iterative instead of recursive?
// If checkMouseButtons is true, it means we are finding targets for a mouse event, so no item for which acceptedMouseButtons() is NoButton will be added.
// If checkAcceptsTouch is true, it means we are finding targets for a touch event, so either acceptTouchEvents() must return true OR
// it must accept a synth. mouse event, thus if acceptTouchEvents() returns false but acceptedMouseButtons() is true, gets added; if not, it doesn't.
QVector<QQuickItem *> QQuickWindowPrivate::pointerTargets(QQuickItem *item, QQuickEventPoint *point, bool checkMouseButtons, bool checkAcceptsTouch) const
{
    QVector<QQuickItem *> targets;
    auto itemPrivate = QQuickItemPrivate::get(item);
    QPointF itemPos = item->mapFromScene(point->scenePosition());
    // if the item clips, we can potentially return early
    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        if (!item->contains(itemPos))
            return targets;
    }

    // recurse for children
    QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        QQuickItem *child = children.at(ii);
        auto childPrivate = QQuickItemPrivate::get(child);
        if (!child->isVisible() || !child->isEnabled() || childPrivate->culled)
            continue;
        targets << pointerTargets(child, point, checkMouseButtons, checkAcceptsTouch);
    }

    bool relevant = item->contains(itemPos);
    if (itemPrivate->hasPointerHandlers()) {
        if (!relevant)
            if (itemPrivate->anyPointerHandlerWants(point))
                relevant = true;
    } else {
        if (relevant && checkMouseButtons && item->acceptedMouseButtons() == Qt::NoButton)
            relevant = false;
        if (relevant && checkAcceptsTouch && !(item->acceptTouchEvents() || item->acceptedMouseButtons()))
            relevant = false;
    }
    if (relevant)
        targets << item; // add this item last: children take precedence
    return targets;
}

// return the joined lists
// list1 has priority, common items come last
QVector<QQuickItem *> QQuickWindowPrivate::mergePointerTargets(const QVector<QQuickItem *> &list1, const QVector<QQuickItem *> &list2) const
{
    QVector<QQuickItem *> targets = list1;
    // start at the end of list2
    // if item not in list, append it
    // if item found, move to next one, inserting before the last found one
    int insertPosition = targets.length();
    for (int i = list2.length() - 1; i >= 0; --i) {
        int newInsertPosition = targets.lastIndexOf(list2.at(i), insertPosition);
        if (newInsertPosition >= 0) {
            Q_ASSERT(newInsertPosition <= insertPosition);
            insertPosition = newInsertPosition;
        }
        // check for duplicates, only insert if the item isn't there already
        if (insertPosition == targets.size() || list2.at(i) != targets.at(insertPosition))
            targets.insert(insertPosition, list2.at(i));
    }
    return targets;
}

void QQuickWindowPrivate::deliverTouchEvent(QQuickPointerTouchEvent *event)
{
    qCDebug(DBG_TOUCH) << " - delivering" << event->asTouchEvent();

    if (event->isPressEvent())
        deliverPressOrReleaseEvent(event);
    if (!event->allUpdatedPointsAccepted())
        deliverUpdatedTouchPoints(event);
    if (event->isReleaseEvent())
        deliverPressOrReleaseEvent(event, true);

    // Remove released points from itemForTouchPointId
    bool allReleased = true;
    int pointCount = event->pointCount();
    for (int i = 0; i < pointCount; ++i) {
        QQuickEventPoint *point = event->point(i);
        if (point->state() == QQuickEventPoint::Released) {
            int id = point->pointId();
            qCDebug(DBG_TOUCH_TARGET) << "TP" << Qt::hex << id << "released";
            point->setGrabberItem(nullptr);
            if (id == touchMouseId)
                cancelTouchMouseSynthesis();
        } else {
            allReleased = false;
        }
    }

    if (allReleased) {
        if (Q_UNLIKELY(!event->exclusiveGrabbers().isEmpty()))
                qWarning() << "No release received for some grabbers" << event->exclusiveGrabbers();
        event->clearGrabbers();
    }
}

// Deliver touch points to existing grabbers
void QQuickWindowPrivate::deliverUpdatedTouchPoints(QQuickPointerTouchEvent *event)
{
    bool done = false;
    const auto grabbers = event->exclusiveGrabbers();
    for (auto grabber : grabbers) {
        // The grabber is guaranteed to be either an item or a handler.
        QQuickItem *receiver = qmlobject_cast<QQuickItem *>(grabber);
        if (!receiver) {
            // The grabber is not an item? It's a handler then.  Let it have the event first.
            QQuickPointerHandler *handler = static_cast<QQuickPointerHandler *>(grabber);
            receiver = static_cast<QQuickPointerHandler *>(grabber)->parentItem();
            hasFiltered.clear();
            if (sendFilteredPointerEvent(event, receiver))
                done = true;
            event->localize(receiver);
            handler->handlePointerEvent(event);
        }
        if (done)
            break;
        // If the grabber is an item or the grabbing handler didn't handle it,
        // then deliver the event to the item (which may have multiple handlers).
        deliverMatchingPointsToItem(receiver, event);
    }

    // Deliver to each eventpoint's passive grabbers (but don't visit any handler more than once)
    int pointCount = event->pointCount();
    for (int i = 0; i < pointCount; ++i) {
        QQuickEventPoint *point = event->point(i);
        deliverToPassiveGrabbers(point->passiveGrabbers(), event);
    }

    if (done)
        return;

    // If some points weren't grabbed, deliver only to non-grabber PointerHandlers in reverse paint order
    if (!event->allPointsGrabbed()) {
        QVector<QQuickItem *> targetItems;
        for (int i = 0; i < pointCount; ++i) {
            QQuickEventPoint *point = event->point(i);
            if (point->state() == QQuickEventPoint::Pressed)
                continue; // presses were delivered earlier; not the responsibility of deliverUpdatedTouchPoints
            QVector<QQuickItem *> targetItemsForPoint = pointerTargets(contentItem, point, false, false);
            if (targetItems.count()) {
                targetItems = mergePointerTargets(targetItems, targetItemsForPoint);
            } else {
                targetItems = targetItemsForPoint;
            }
        }
        for (QQuickItem *item : targetItems) {
            if (grabbers.contains(item))
                continue;
            QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
            event->localize(item);
            itemPrivate->handlePointerEvent(event, true); // avoid re-delivering to grabbers
            if (event->allPointsGrabbed())
                break;
        }
    }
}

// Deliver an event containing newly pressed or released touch points
bool QQuickWindowPrivate::deliverPressOrReleaseEvent(QQuickPointerEvent *event, bool handlersOnly)
{
    int pointCount = event->pointCount();
    QVector<QQuickItem *> targetItems;
    bool isTouchEvent = (event->asPointerTouchEvent() != nullptr);
    if (isTouchEvent && event->isPressEvent() && isDeliveringTouchAsMouse()) {
        if (const QQuickEventPoint *point = pointerEventInstance(touchMouseDevice)->pointById(touchMouseId)) {
            // When a second point is pressed, if the first point's existing
            // grabber was a pointer handler while a filtering parent is filtering
            // the same first point _as mouse_: we're starting over with delivery,
            // so we need to allow the second point to now be sent as a synth-mouse
            // instead of the first one, so that filtering parents (maybe even the
            // same one) can get a chance to see the second touchpoint as a
            // synth-mouse and perhaps grab it.  Ideally we would always do this
            // when a new touchpoint is pressed, but this compromise fixes
            // QTBUG-70998 and avoids breaking tst_FlickableInterop::touchDragSliderAndFlickable
            if (point->grabberPointerHandler())
                cancelTouchMouseSynthesis();
        } else {
            qCWarning(DBG_TOUCH_TARGET) << "during delivery of touch press, synth-mouse ID" << Qt::hex << touchMouseId << "is missing from" << event;
        }
    }
    for (int i = 0; i < pointCount; ++i) {
        auto point = event->point(i);
        if (point->state() == QQuickEventPoint::Pressed && !event->isDoubleClickEvent())
            point->clearPassiveGrabbers();
        point->setAccepted(false); // because otherwise touchEventForItem will ignore it
        if (point->grabberPointerHandler() && point->state() == QQuickEventPoint::Released)
            point->setGrabberPointerHandler(nullptr, true);
        QVector<QQuickItem *> targetItemsForPoint = pointerTargets(contentItem, point, !isTouchEvent, isTouchEvent);
        if (targetItems.count()) {
            targetItems = mergePointerTargets(targetItems, targetItemsForPoint);
        } else {
            targetItems = targetItemsForPoint;
        }
    }

    for (QQuickItem *item : targetItems) {
        if (!event->m_event) {
            qWarning("event went missing during delivery! (nested sendEvent() is not allowed)");
            break;
        }
        hasFiltered.clear();
        if (!handlersOnly && sendFilteredPointerEvent(event, item)) {
            if (event->isAccepted()) {
                for (int i = 0; i < event->pointCount(); ++i)
                    event->point(i)->setAccepted();
                return true;
            }
            skipDelivery.append(item);
        }

        // Do not deliverMatchingPointsTo any item for which the filtering parent already intercepted the event,
        // nor to any item which already had a chance to filter.
        if (skipDelivery.contains(item))
            continue;
        if (!event->m_event) {
            qWarning("event went missing during delivery! (nested sendEvent() is not allowed)");
            break;
        }
        deliverMatchingPointsToItem(item, event, handlersOnly);
        if (event->allPointsAccepted())
            handlersOnly = true;
    }

    return event->allPointsAccepted();
}

void QQuickWindowPrivate::deliverMatchingPointsToItem(QQuickItem *item, QQuickPointerEvent *pointerEvent, bool handlersOnly)
{
    Q_Q(QQuickWindow);
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
#if defined(Q_OS_ANDROID) && QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    // QTBUG-85379
    // In QT_VERSION below 6.0.0 touchEnabled for QtQuickItems is set by default to true
    // It causes delivering touch events to Items which are not interested
    // In some cases (like using Material Style in Android) it may cause a crash
    if (itemPrivate->wasDeleted)
        return;
#endif
    pointerEvent->localize(item);

    // Let the Item's handlers (if any) have the event first.
    // However, double click should never be delivered to handlers.
    if (!pointerEvent->isDoubleClickEvent()) {
        bool wasAccepted = pointerEvent->allPointsAccepted();
        itemPrivate->handlePointerEvent(pointerEvent);
        allowDoubleClick = wasAccepted || !(pointerEvent->asPointerMouseEvent() && pointerEvent->isPressEvent() && pointerEvent->allPointsAccepted());
    }
    if (handlersOnly)
        return;

    // If all points are released and the item is not the grabber, it doesn't get the event.
    // But if at least one point is still pressed, we might be in a potential gesture-takeover scenario.
    if (pointerEvent->isReleaseEvent() && !pointerEvent->isUpdateEvent()
            && !pointerEvent->exclusiveGrabbers().contains(item))
        return;

    // TODO: unite this mouse point delivery with the synthetic mouse event below
    auto event = pointerEvent->asPointerMouseEvent();
    if (event && item->acceptedMouseButtons() & event->button()) {
            auto point = event->point(0);
            // The only reason to already have a mouse grabber here is
            // synthetic events - flickable sends one when setPressDelay is used.
            auto oldMouseGrabber = q->mouseGrabberItem();
            QPointF localPos = item->mapFromScene(point->scenePosition());
            QMouseEvent *me = event->asMouseEvent(localPos);
            me->accept();
            QCoreApplication::sendEvent(item, me);
            if (me->isAccepted()) {
                auto mouseGrabber = q->mouseGrabberItem();
                if (mouseGrabber && mouseGrabber != item && mouseGrabber != oldMouseGrabber) {
                    item->mouseUngrabEvent();
                } else if (item->isEnabled() && item->isVisible()) {
                    item->grabMouse();
                }
                point->setAccepted(true);
            }
        return;
    }

    QQuickPointerTouchEvent *ptEvent = pointerEvent->asPointerTouchEvent();
    if (!ptEvent)
        return;

    QScopedPointer<QTouchEvent> touchEvent(ptEvent->touchEventForItem(item));
    if (!touchEvent)
        return;

    qCDebug(DBG_TOUCH) << "considering delivering " << touchEvent.data() << " to " << item;
    bool eventAccepted = false;

    // If any parent filters the event, we're done.
    hasFiltered.clear();
    if (sendFilteredPointerEvent(pointerEvent, item))
        return;

    // Deliver the touch event to the given item
    qCDebug(DBG_TOUCH) << " - actually delivering " << touchEvent.data() << " to " << item;
    QCoreApplication::sendEvent(item, touchEvent.data());
    eventAccepted = touchEvent->isAccepted();

    // If the touch event wasn't accepted, synthesize a mouse event and see if the item wants it.
    if (Q_LIKELY(QCoreApplication::testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents))) {
        if (!eventAccepted && (itemPrivate->acceptedMouseButtons() & Qt::LeftButton)) {
            //  send mouse event
            if (deliverTouchAsMouse(item, ptEvent))
                eventAccepted = true;
        }
    }

    if (eventAccepted) {
        // If the touch was accepted (regardless by whom or in what form),
        // update accepted new points.
        bool isPressOrRelease = pointerEvent->isPressEvent() || pointerEvent->isReleaseEvent();
        for (const auto &point: qAsConst(touchEvent->touchPoints())) {
            if (auto pointerEventPoint = ptEvent->pointById(point.id())) {
                pointerEventPoint->setAccepted();
                if (isPressOrRelease)
                    pointerEventPoint->setGrabberItem(item);
            }
        }
    } else {
        // But if the event was not accepted then we know this item
        // will not be interested in further updates for those touchpoint IDs either.
        for (const auto &point: qAsConst(touchEvent->touchPoints())) {
            if (point.state() == Qt::TouchPointPressed) {
                if (auto *tp = ptEvent->pointById(point.id())) {
                    if (tp->exclusiveGrabber() == item) {
                        qCDebug(DBG_TOUCH_TARGET) << "TP" << Qt::hex << point.id() << "disassociated";
                        tp->setGrabberItem(nullptr);
                    }
                }
            }
        }
    }
}

#if QT_CONFIG(quick_draganddrop)
void QQuickWindowPrivate::deliverDragEvent(QQuickDragGrabber *grabber, QEvent *event)
{
    grabber->resetTarget();
    QQuickDragGrabber::iterator grabItem = grabber->begin();
    if (grabItem != grabber->end()) {
        Q_ASSERT(event->type() != QEvent::DragEnter);
        if (event->type() == QEvent::Drop) {
            QDropEvent *e = static_cast<QDropEvent *>(event);
            for (e->setAccepted(false); !e->isAccepted() && grabItem != grabber->end(); grabItem = grabber->release(grabItem)) {
                QPointF p = (**grabItem)->mapFromScene(e->pos());
                QDropEvent translatedEvent(
                        p.toPoint(),
                        e->possibleActions(),
                        e->mimeData(),
                        e->mouseButtons(),
                        e->keyboardModifiers());
                QQuickDropEventEx::copyActions(&translatedEvent, *e);
                QCoreApplication::sendEvent(**grabItem, &translatedEvent);
                e->setAccepted(translatedEvent.isAccepted());
                e->setDropAction(translatedEvent.dropAction());
                grabber->setTarget(**grabItem);
            }
        }
        if (event->type() != QEvent::DragMove) {    // Either an accepted drop or a leave.
            QDragLeaveEvent leaveEvent;
            for (; grabItem != grabber->end(); grabItem = grabber->release(grabItem))
                QCoreApplication::sendEvent(**grabItem, &leaveEvent);
            return;
        } else {
            QDragMoveEvent *moveEvent = static_cast<QDragMoveEvent *>(event);

            // Used to ensure we don't send DragEnterEvents to current drop targets,
            // and to detect which current drop targets we have left
            QVarLengthArray<QQuickItem*, 64> currentGrabItems;
            for (; grabItem != grabber->end(); grabItem = grabber->release(grabItem))
                currentGrabItems.append(**grabItem);

            // Look for any other potential drop targets that are higher than the current ones
            QDragEnterEvent enterEvent(
                    moveEvent->pos(),
                    moveEvent->possibleActions(),
                    moveEvent->mimeData(),
                    moveEvent->mouseButtons(),
                    moveEvent->keyboardModifiers());
            QQuickDropEventEx::copyActions(&enterEvent, *moveEvent);
            event->setAccepted(deliverDragEvent(grabber, contentItem, &enterEvent, &currentGrabItems));

            for (grabItem = grabber->begin(); grabItem != grabber->end(); ++grabItem) {
                int i = currentGrabItems.indexOf(**grabItem);
                if (i >= 0) {
                    currentGrabItems.remove(i);
                    // Still grabbed: send move event
                    QDragMoveEvent translatedEvent(
                            (**grabItem)->mapFromScene(moveEvent->pos()).toPoint(),
                            moveEvent->possibleActions(),
                            moveEvent->mimeData(),
                            moveEvent->mouseButtons(),
                            moveEvent->keyboardModifiers());
                    QQuickDropEventEx::copyActions(&translatedEvent, *moveEvent);
                    QCoreApplication::sendEvent(**grabItem, &translatedEvent);
                    event->setAccepted(translatedEvent.isAccepted());
                    QQuickDropEventEx::copyActions(moveEvent, translatedEvent);
                }
            }

            // Anything left in currentGrabItems is no longer a drop target and should be sent a DragLeaveEvent
            QDragLeaveEvent leaveEvent;
            for (QQuickItem *i : currentGrabItems)
                QCoreApplication::sendEvent(i, &leaveEvent);

            return;
        }
    }
    if (event->type() == QEvent::DragEnter || event->type() == QEvent::DragMove) {
        QDragMoveEvent *e = static_cast<QDragMoveEvent *>(event);
        QDragEnterEvent enterEvent(
                e->pos(),
                e->possibleActions(),
                e->mimeData(),
                e->mouseButtons(),
                e->keyboardModifiers());
        QQuickDropEventEx::copyActions(&enterEvent, *e);
        event->setAccepted(deliverDragEvent(grabber, contentItem, &enterEvent));
    }
}

bool QQuickWindowPrivate::deliverDragEvent(QQuickDragGrabber *grabber, QQuickItem *item, QDragMoveEvent *event, QVarLengthArray<QQuickItem*, 64> *currentGrabItems)
{
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
    if (!item->isVisible() || !item->isEnabled() || QQuickItemPrivate::get(item)->culled)
        return false;
    QPointF p = item->mapFromScene(event->pos());
    bool itemContained = item->contains(p);

    if (!itemContained && itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        return false;
    }

    QDragEnterEvent enterEvent(
            event->pos(),
            event->possibleActions(),
            event->mimeData(),
            event->mouseButtons(),
            event->keyboardModifiers());
    QQuickDropEventEx::copyActions(&enterEvent, *event);
    QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();

    // Check children in front of this item first
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        if (children.at(ii)->z() < 0)
            continue;
        if (deliverDragEvent(grabber, children.at(ii), &enterEvent, currentGrabItems))
            return true;
    }

    if (itemContained) {
        // If this item is currently grabbed, don't send it another DragEnter,
        // just grab it again if it's still contained.
        if (currentGrabItems && currentGrabItems->contains(item)) {
            grabber->grab(item);
            grabber->setTarget(item);
            return true;
        }

        if (event->type() == QEvent::DragMove || itemPrivate->flags & QQuickItem::ItemAcceptsDrops) {
            QDragMoveEvent translatedEvent(
                    p.toPoint(),
                    event->possibleActions(),
                    event->mimeData(),
                    event->mouseButtons(),
                    event->keyboardModifiers(),
                    event->type());
            QQuickDropEventEx::copyActions(&translatedEvent, *event);
            translatedEvent.setAccepted(event->isAccepted());
            QCoreApplication::sendEvent(item, &translatedEvent);
            event->setAccepted(translatedEvent.isAccepted());
            event->setDropAction(translatedEvent.dropAction());
            if (event->type() == QEvent::DragEnter) {
                if (translatedEvent.isAccepted()) {
                    grabber->grab(item);
                    grabber->setTarget(item);
                    return true;
                }
            } else {
                return true;
            }
        }
    }

    // Check children behind this item if this item or any higher children have not accepted
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        if (children.at(ii)->z() >= 0)
            continue;
        if (deliverDragEvent(grabber, children.at(ii), &enterEvent, currentGrabItems))
            return true;
    }

    return false;
}
#endif // quick_draganddrop

#if QT_CONFIG(cursor)
void QQuickWindowPrivate::updateCursor(const QPointF &scenePos)
{
    Q_Q(QQuickWindow);

    auto cursorItemAndHandler = findCursorItemAndHandler(contentItem, scenePos);

    if (cursorItem != cursorItemAndHandler.first || cursorHandler != cursorItemAndHandler.second) {
        QWindow *renderWindow = QQuickRenderControl::renderWindowFor(q);
        QWindow *window = renderWindow ? renderWindow : q;
        cursorItem = cursorItemAndHandler.first;
        cursorHandler = cursorItemAndHandler.second;
        if (cursorItem)
            window->setCursor(QQuickItemPrivate::get(cursorItem)->effectiveCursor(cursorHandler));
        else
            window->unsetCursor();
    }
}

QPair<QQuickItem*, QQuickPointerHandler*> QQuickWindowPrivate::findCursorItemAndHandler(QQuickItem *item, const QPointF &scenePos) const
{
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        QPointF p = item->mapFromScene(scenePos);
        if (!item->contains(p))
            return {nullptr, nullptr};
    }

    if (itemPrivate->subtreeCursorEnabled) {
        QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
        for (int ii = children.count() - 1; ii >= 0; --ii) {
            QQuickItem *child = children.at(ii);
            if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
                continue;
            auto ret = findCursorItemAndHandler(child, scenePos);
            if (ret.first)
                return ret;
        }
        if (itemPrivate->hasCursorHandler) {
            if (auto handler = itemPrivate->effectiveCursorHandler()) {
                QQuickPointerEvent *pointerEvent = pointerEventInstance(QQuickPointerDevice::genericMouseDevice(), QEvent::MouseMove);
                pointerEvent->point(0)->reset(Qt::TouchPointMoved, scenePos, quint64(1) << 24 /* mouse has device ID 1 */, 0);
                pointerEvent->point(0)->setAccepted(true);
                pointerEvent->localize(item);
                if (handler->parentContains(pointerEvent->point(0)))
                    return {item, handler};
            }
        }
        if (itemPrivate->hasCursor) {
            QPointF p = item->mapFromScene(scenePos);
            if (item->contains(p))
                return {item, nullptr};
        }
    }

    return {nullptr, nullptr};
}
#endif

bool QQuickWindowPrivate::sendFilteredPointerEvent(QQuickPointerEvent *event, QQuickItem *receiver, QQuickItem *filteringParent)
{
    return sendFilteredPointerEventImpl(event, receiver, filteringParent ? filteringParent : receiver->parentItem());
}

bool QQuickWindowPrivate::sendFilteredPointerEventImpl(QQuickPointerEvent *event, QQuickItem *receiver, QQuickItem *filteringParent)
{
    if (!allowChildEventFiltering)
        return false;
    if (!filteringParent)
        return false;
    bool filtered = false;
    if (filteringParent->filtersChildMouseEvents() && !hasFiltered.contains(filteringParent)) {
        hasFiltered.append(filteringParent);
        if (QQuickPointerMouseEvent *pme = event->asPointerMouseEvent()) {
            if (receiver->acceptedMouseButtons()) {
                QPointF localPos = receiver->mapFromScene(pme->point(0)->scenePosition());
                QMouseEvent *me = pme->asMouseEvent(localPos);
                const bool wasAccepted = me->isAccepted();
                me->setAccepted(true);
                auto oldMouseGrabber = pme->point(0)->grabberItem();
                if (filteringParent->childMouseEventFilter(receiver, me)) {
                    qCDebug(DBG_MOUSE) << "mouse event intercepted by childMouseEventFilter of " << filteringParent;
                    skipDelivery.append(filteringParent);
                    filtered = true;
                    if (me->isAccepted() && pme->isPressEvent()) {
                        auto mouseGrabber = pme->point(0)->grabberItem();
                        if (mouseGrabber && mouseGrabber != receiver && mouseGrabber != oldMouseGrabber) {
                            receiver->mouseUngrabEvent();
                        } else {
                            pme->point(0)->setGrabberItem(receiver);
                        }
                    }
                } else {
                    // Restore accepted state if the event was not filtered.
                    me->setAccepted(wasAccepted);
                }
            }
        } else if (QQuickPointerTouchEvent *pte = event->asPointerTouchEvent()) {
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
            bool acceptsTouchEvents = receiver->acceptTouchEvents();
#else
            // In versions prior to Qt 6, we can't trust item->acceptTouchEvents() here, because it defaults to true.
            bool acceptsTouchEvents = false;
#endif
            auto device = pte->device();
            if (device->type() == QQuickPointerDevice::TouchPad &&
                    device->capabilities().testFlag(QQuickPointerDevice::MouseEmulation)) {
                qCDebug(DBG_TOUCH_TARGET) << "skipping filtering of synth-mouse event from" << device;
            } else if (acceptsTouchEvents || receiver->acceptedMouseButtons()) {
                // get a touch event customized for delivery to filteringParent
                QScopedPointer<QTouchEvent> filteringParentTouchEvent(pte->touchEventForItem(receiver, true));
                if (filteringParentTouchEvent) {
                    if (filteringParent->childMouseEventFilter(receiver, filteringParentTouchEvent.data())) {
                        qCDebug(DBG_TOUCH) << "touch event intercepted by childMouseEventFilter of " << filteringParent;
                        skipDelivery.append(filteringParent);
                        for (const auto &point: qAsConst(filteringParentTouchEvent->touchPoints())) {
                            QQuickEventPoint *pt = event->pointById(point.id());
                            pt->setAccepted();
                            pt->setGrabberItem(filteringParent);
                        }
                        return true;
                    } else if (Q_LIKELY(QCoreApplication::testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents))) {
                        // filteringParent didn't filter the touch event.  Give it a chance to filter a synthetic mouse event.
                        for (int i = 0; i < filteringParentTouchEvent->touchPoints().size(); ++i) {
                            const QTouchEvent::TouchPoint &tp = filteringParentTouchEvent->touchPoints().at(i);

                            QEvent::Type t;
                            switch (tp.state()) {
                            case Qt::TouchPointPressed:
                                t = QEvent::MouseButtonPress;
                                break;
                            case Qt::TouchPointReleased:
                                t = QEvent::MouseButtonRelease;
                                break;
                            case Qt::TouchPointStationary:
                                continue;
                            default:
                                t = QEvent::MouseMove;
                                break;
                            }

                            bool touchMouseUnset = (touchMouseId == -1);
                            // Only deliver mouse event if it is the touchMouseId or it could become the touchMouseId
                            if (touchMouseUnset || touchMouseId == tp.id()) {
                                // convert filteringParentTouchEvent (which is already transformed wrt local position, velocity, etc.)
                                // into a synthetic mouse event, and let childMouseEventFilter() have another chance with that
                                QScopedPointer<QMouseEvent> mouseEvent(touchToMouseEvent(t, tp, filteringParentTouchEvent.data(), receiver, false));
                                // If a filtering item calls QQuickWindow::mouseGrabberItem(), it should
                                // report the touchpoint's grabber.  Whenever we send a synthetic mouse event,
                                // touchMouseId and touchMouseDevice must be set, even if it's only temporarily and isn't grabbed.
                                touchMouseId = tp.id();
                                touchMouseDevice = event->device();
                                QQuickPointerDevice *dev = touchMouseDevice;
                                if (filteringParent->childMouseEventFilter(receiver, mouseEvent.data())) {
                                    qCDebug(DBG_TOUCH) << "touch event intercepted as synth mouse event by childMouseEventFilter of " << filteringParent;
                                    skipDelivery.append(filteringParent);
                                    if (t != QEvent::MouseButtonRelease) {
                                        qCDebug(DBG_TOUCH_TARGET) << "TP (mouse)" << Qt::hex << tp.id() << "->" << filteringParent;
                                        pointerEventInstance(dev)->pointById(tp.id())->setGrabberItem(filteringParent);
                                        touchMouseUnset = false; // We want to leave touchMouseId and touchMouseDevice set
                                        if (mouseEvent->isAccepted())
                                            filteringParent->grabMouse();
                                    }
                                    filtered = true;
                                }
                                if (touchMouseUnset) {
                                    // Now that we're done sending a synth mouse event, and it wasn't grabbed,
                                    // the touchpoint is no longer acting as a synthetic mouse.  Restore previous state.
                                    cancelTouchMouseSynthesis();
                                }
                                // Only one touchpoint can be treated as a synthetic mouse, so after childMouseEventFilter
                                // has been called once, we're done with this loop over the touchpoints.
                                break;
                            }
                        }
                    }
                }
            }
        }
    }
    return sendFilteredPointerEventImpl(event, receiver, filteringParent->parentItem()) || filtered;
}

bool QQuickWindowPrivate::sendFilteredMouseEvent(QEvent *event, QQuickItem *receiver, QQuickItem *filteringParent)
{
    if (!filteringParent)
        return false;

    QQuickItemPrivate *filteringParentPrivate = QQuickItemPrivate::get(filteringParent);
    if (filteringParentPrivate->replayingPressEvent)
        return false;

    bool filtered = false;
    if (filteringParentPrivate->filtersChildMouseEvents && !hasFiltered.contains(filteringParent)) {
        hasFiltered.append(filteringParent);
        if (filteringParent->childMouseEventFilter(receiver, event)) {
            filtered = true;
            skipDelivery.append(filteringParent);
        }
        qCDebug(DBG_MOUSE_TARGET) << "for" << receiver << filteringParent << "childMouseEventFilter ->" << filtered;
    }

    return sendFilteredMouseEvent(event, receiver, filteringParent->parentItem()) || filtered;
}

bool QQuickWindowPrivate::dragOverThreshold(qreal d, Qt::Axis axis, QMouseEvent *event, int startDragThreshold)
{
    QStyleHints *styleHints = QGuiApplication::styleHints();
    int caps = QGuiApplicationPrivate::mouseEventCaps(event);
    bool dragVelocityLimitAvailable = (caps & QTouchDevice::Velocity)
        && styleHints->startDragVelocity();
    bool overThreshold = qAbs(d) > (startDragThreshold >= 0 ? startDragThreshold : styleHints->startDragDistance());
    if (dragVelocityLimitAvailable) {
        QVector2D velocityVec = QGuiApplicationPrivate::mouseEventVelocity(event);
        qreal velocity = axis == Qt::XAxis ? velocityVec.x() : velocityVec.y();
        overThreshold |= qAbs(velocity) > styleHints->startDragVelocity();
    }
    return overThreshold;
}

bool QQuickWindowPrivate::dragOverThreshold(qreal d, Qt::Axis axis, const QTouchEvent::TouchPoint *tp, int startDragThreshold)
{
    QStyleHints *styleHints = qApp->styleHints();
    bool overThreshold = qAbs(d) > (startDragThreshold >= 0 ? startDragThreshold : styleHints->startDragDistance());
    const bool dragVelocityLimitAvailable = (styleHints->startDragVelocity() > 0);
    if (!overThreshold && dragVelocityLimitAvailable) {
        qreal velocity = axis == Qt::XAxis ? tp->velocity().x() : tp->velocity().y();
        overThreshold |= qAbs(velocity) > styleHints->startDragVelocity();
    }
    return overThreshold;
}

bool QQuickWindowPrivate::dragOverThreshold(QVector2D delta)
{
    int threshold = qApp->styleHints()->startDragDistance();
    return qAbs(delta.x()) > threshold || qAbs(delta.y()) > threshold;
}

/*!
    \qmlproperty list<Object> Window::data
    \default

    The data property allows you to freely mix visual children, resources
    and other Windows in a Window.

    If you assign another Window to the data list, the nested window will
    become "transient for" the outer Window.

    If you assign an \l Item to the data list, it becomes a child of the
    Window's \l contentItem, so that it appears inside the window. The item's
    parent will be the window's contentItem, which is the root of the Item
    ownership tree within that Window.

    If you assign any other object type, it is added as a resource.

    It should not generally be necessary to refer to the \c data property,
    as it is the default property for Window and thus all child items are
    automatically assigned to this property.

    \sa QWindow::transientParent()
 */

void QQuickWindowPrivate::data_append(QQmlListProperty<QObject> *property, QObject *o)
{
    if (!o)
        return;
    QQuickWindow *that = static_cast<QQuickWindow *>(property->object);
    if (QQuickWindow *window = qmlobject_cast<QQuickWindow *>(o)) {
        qCDebug(lcTransient) << window << "is transient for" << that;
        window->setTransientParent(that);
    }
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(that->contentItem())->data();
    itemProperty.append(&itemProperty, o);
}

int QQuickWindowPrivate::data_count(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    if (!win || !win->contentItem() || !QQuickItemPrivate::get(win->contentItem())->data().count)
        return 0;
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    return itemProperty.count(&itemProperty);
}

QObject *QQuickWindowPrivate::data_at(QQmlListProperty<QObject> *property, int i)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    return itemProperty.at(&itemProperty, i);
}

void QQuickWindowPrivate::data_clear(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.clear(&itemProperty);
}

void QQuickWindowPrivate::data_replace(QQmlListProperty<QObject> *property, int i, QObject *o)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.replace(&itemProperty, i, o);
}

void QQuickWindowPrivate::data_removeLast(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.removeLast(&itemProperty);
}

bool QQuickWindowPrivate::isRenderable() const
{
    Q_Q(const QQuickWindow);
    return ((q->isExposed() && q->isVisible())) && q->geometry().isValid();
}

void QQuickWindowPrivate::contextCreationFailureMessage(const QSurfaceFormat &format,
                                                        QString *translatedMessage,
                                                        QString *untranslatedMessage)
{
    const QString contextType = QLatin1String("OpenGL");
    QString formatStr;
    QDebug(&formatStr) << format;
#if defined(Q_OS_WIN32)
    const bool isDebug = QLibraryInfo::isDebugBuild();
    const QString eglLibName = QLatin1String(isDebug ? "libEGLd.dll" : "libEGL.dll");
    const QString glesLibName = QLatin1String(isDebug ? "libGLESv2d.dll" : "libGLESv2.dll");
     //: %1 Context type (Open GL, EGL), %2 format, ANGLE %3, %4 library names
    const char msg[] = QT_TRANSLATE_NOOP("QQuickWindow",
        "Failed to create %1 context for format %2.\n"
        "This is most likely caused by not having the necessary graphics drivers installed.\n\n"
        "Install a driver providing OpenGL 2.0 or higher, or, if this is not possible, "
        "make sure the ANGLE Open GL ES 2.0 emulation libraries (%3, %4 and d3dcompiler_*.dll) "
        "are available in the application executable's directory or in a location listed in PATH.");
    *translatedMessage = QQuickWindow::tr(msg).arg(contextType, formatStr, eglLibName, glesLibName);
    *untranslatedMessage = QString::fromLatin1(msg).arg(contextType, formatStr, eglLibName, glesLibName);
#else // Q_OS_WIN32
    //: %1 Context type (Open GL, EGL), %2 format specification
    const char msg[] = QT_TRANSLATE_NOOP("QQuickWindow",
                                         "Failed to create %1 context for format %2");
    *translatedMessage = QQuickWindow::tr(msg).arg(contextType, formatStr);
    *untranslatedMessage = QString::fromLatin1(msg).arg(contextType, formatStr);
#endif // !Q_OS_WIN32
}

void QQuickWindowPrivate::rhiCreationFailureMessage(const QString &backendName,
                                                    QString *translatedMessage,
                                                    QString *untranslatedMessage)
{
    const char msg[] = QT_TRANSLATE_NOOP("QQuickWindow",
        "Failed to initialize graphics backend for %1.");
    *translatedMessage = QQuickWindow::tr(msg).arg(backendName);
    *untranslatedMessage = QString::fromLatin1(msg).arg(backendName);
}

#if QT_DEPRECATED_SINCE(5, 8)

// ### Qt6: remove
/*!
    Propagates an event \a e to a QQuickItem \a item on the window.

    Use \l QCoreApplication::sendEvent() directly instead.

    The return value is currently not used.

    \deprecated
*/
bool QQuickWindow::sendEvent(QQuickItem *item, QEvent *e)
{
    Q_D(QQuickWindow);

    if (!item) {
        qWarning("QQuickWindow::sendEvent: Cannot send event to a null item");
        return false;
    }

    Q_ASSERT(e);

    switch (e->type()) {
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
        e->accept();
        QCoreApplication::sendEvent(item, e);
        while (!e->isAccepted() && (item = item->parentItem())) {
            e->accept();
            QCoreApplication::sendEvent(item, e);
        }
        break;
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::MouseMove: {
            // XXX todo - should sendEvent be doing this?  how does it relate to forwarded events?
            d->hasFiltered.clear();