qquickitem.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickitem.h"
 
#include "qquickwindow.h"
#include "qquickrendercontrol.h"
#include <QtQml/qjsengine.h>
#include "qquickwindow_p.h"
 
#include "qquickevents_p_p.h"
#include "qquickscreen_p.h"
 
#include <QtQml/qqmlengine.h>
#include <QtQml/qqmlcomponent.h>
#include <QtQml/qqmlinfo.h>
#include <QtGui/qpen.h>
#include <QtGui/qguiapplication.h>
#include <QtGui/qstylehints.h>
#include <QtGui/private/qeventpoint_p.h>
#include <QtGui/private/qguiapplication_p.h>
#include <QtGui/private/qpointingdevice_p.h>
#include <QtGui/qinputmethod.h>
#include <QtCore/qcoreevent.h>
#include <QtCore/private/qnumeric_p.h>
#include <QtGui/qpa/qplatformtheme.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/private/qduplicatetracker_p.h>
 
#include <private/qqmlglobal_p.h>
#include <private/qqmlengine_p.h>
#include <QtQuick/private/qquickstategroup_p.h>
#include <private/qqmlopenmetaobject_p.h>
#include <QtQuick/private/qquickstate_p.h>
#include <private/qquickitem_p.h>
#include <QtQuick/private/qquickaccessibleattached_p.h>
#include <QtQuick/private/qquickhoverhandler_p.h>
#include <QtQuick/private/qquickpointerhandler_p.h>
#include <QtQuick/private/qquickpointerhandler_p_p.h>
 
#include <private/qv4engine_p.h>
#include <private/qv4object_p.h>
#include <private/qv4qobjectwrapper_p.h>
#include <private/qdebug_p.h>
#include <private/qqmlvaluetypewrapper_p.h>
 
#if QT_CONFIG(cursor)
# include <QtGui/qcursor.h>
#endif
 
#include <QtCore/qpointer.h>
 
#include <algorithm>
#include <limits>
 
// XXX todo Check that elements that create items handle memory correctly after visual ownership change
 
QT_BEGIN_NAMESPACE
 
Q_DECLARE_LOGGING_CATEGORY(lcMouseTarget)
Q_DECLARE_LOGGING_CATEGORY(lcHoverTrace)
Q_DECLARE_LOGGING_CATEGORY(lcPtr)
Q_DECLARE_LOGGING_CATEGORY(lcTransient)
Q_LOGGING_CATEGORY(lcHandlerParent, "qt.quick.handler.parent")
Q_LOGGING_CATEGORY(lcVP, "qt.quick.viewport")
Q_LOGGING_CATEGORY(lcChangeListeners, "qt.quick.item.changelisteners")
 
// after 100ms, a mouse/non-mouse cursor conflict is resolved in favor of the mouse handler
static const quint64 kCursorOverrideTimeout = 100;
 
void debugFocusTree(QQuickItem *item, QQuickItem *scope = nullptr, int depth = 1)
{
    if (lcFocus().isEnabled(QtDebugMsg)) {
        qCDebug(lcFocus)
                << QByteArray(depth, '\t').constData()
                << (scope && QQuickItemPrivate::get(scope)->subFocusItem == item ? '*' : ' ')
                << item->hasFocus()
                << item->hasActiveFocus()
                << item->isFocusScope()
                << item;
        const auto childItems = item->childItems();
        for (QQuickItem *child : childItems) {
            debugFocusTree(
                    child,
                    item->isFocusScope() || !scope ? item : scope,
                    item->isFocusScope() || !scope ? depth + 1 : depth);
        }
    }
}
 
static void setActiveFocus(QQuickItem *item, Qt::FocusReason reason)
{
    QQuickItemPrivate *d = QQuickItemPrivate::get(item);
    if (d->subFocusItem && d->window && d->flags & QQuickItem::ItemIsFocusScope)
        QQuickWindowPrivate::get(d->window)->clearFocusInScope(item, d->subFocusItem, reason);
    item->forceActiveFocus(reason);
}
 
QQuickTransformPrivate::QQuickTransformPrivate()
{
}
 
QQuickTransform::QQuickTransform(QObject *parent)
: QObject(*(new QQuickTransformPrivate), parent)
{
}
 
QQuickTransform::QQuickTransform(QQuickTransformPrivate &dd, QObject *parent)
: QObject(dd, parent)
{
}
 
QQuickTransform::~QQuickTransform()
{
    Q_D(QQuickTransform);
    for (int ii = 0; ii < d->items.size(); ++ii) {
        QQuickItemPrivate *p = QQuickItemPrivate::get(d->items.at(ii));
        p->transforms.removeOne(this);
        p->dirty(QQuickItemPrivate::Transform);
    }
}
 
void QQuickTransform::update()
{
    Q_D(QQuickTransform);
    for (int ii = 0; ii < d->items.size(); ++ii) {
        QQuickItemPrivate *p = QQuickItemPrivate::get(d->items.at(ii));
        p->dirty(QQuickItemPrivate::Transform);
    }
}
 
QQuickContents::QQuickContents(QQuickItem *item)
: m_item(item)
{
}
 
QQuickContents::~QQuickContents()
{
    QList<QQuickItem *> children = m_item->childItems();
    for (int i = 0; i < children.size(); ++i) {
        QQuickItem *child = children.at(i);
        QQuickItemPrivate::get(child)->removeItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed);
    }
}
 
bool QQuickContents::calcHeight(QQuickItem *changed)
{
    qreal oldy = m_contents.y();
    qreal oldheight = m_contents.height();
 
    if (changed) {
        qreal top = oldy;
        qreal bottom = oldy + oldheight;
        qreal y = changed->y();
        if (y + changed->height() > bottom)
            bottom = y + changed->height();
        if (y < top)
            top = y;
        m_contents.setY(top);
        m_contents.setHeight(bottom - top);
    } else {
        qreal top = std::numeric_limits<qreal>::max();
        qreal bottom = -std::numeric_limits<qreal>::max();
        QList<QQuickItem *> children = m_item->childItems();
        for (int i = 0; i < children.size(); ++i) {
            QQuickItem *child = children.at(i);
            qreal y = child->y();
            if (y + child->height() > bottom)
                bottom = y + child->height();
            if (y < top)
                top = y;
        }
        if (!children.isEmpty())
            m_contents.setY(top);
        m_contents.setHeight(qMax(bottom - top, qreal(0.0)));
    }
 
    return (m_contents.height() != oldheight || m_contents.y() != oldy);
}
 
bool QQuickContents::calcWidth(QQuickItem *changed)
{
    qreal oldx = m_contents.x();
    qreal oldwidth = m_contents.width();
 
    if (changed) {
        qreal left = oldx;
        qreal right = oldx + oldwidth;
        qreal x = changed->x();
        if (x + changed->width() > right)
            right = x + changed->width();
        if (x < left)
            left = x;
        m_contents.setX(left);
        m_contents.setWidth(right - left);
    } else {
        qreal left = std::numeric_limits<qreal>::max();
        qreal right = -std::numeric_limits<qreal>::max();
        QList<QQuickItem *> children = m_item->childItems();
        for (int i = 0; i < children.size(); ++i) {
            QQuickItem *child = children.at(i);
            qreal x = child->x();
            if (x + child->width() > right)
                right = x + child->width();
            if (x < left)
                left = x;
        }
        if (!children.isEmpty())
            m_contents.setX(left);
        m_contents.setWidth(qMax(right - left, qreal(0.0)));
    }
 
    return (m_contents.width() != oldwidth || m_contents.x() != oldx);
}
 
void QQuickContents::complete()
{
    QQuickItemPrivate::get(m_item)->addItemChangeListener(this, QQuickItemPrivate::Children);
 
    QList<QQuickItem *> children = m_item->childItems();
    for (int i = 0; i < children.size(); ++i) {
        QQuickItem *child = children.at(i);
        QQuickItemPrivate::get(child)->addItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed);
        //###what about changes to visibility?
    }
    calcGeometry();
}
 
void QQuickContents::updateRect()
{
    QQuickItemPrivate::get(m_item)->emitChildrenRectChanged(rectF());
}
 
void QQuickContents::itemGeometryChanged(QQuickItem *changed, QQuickGeometryChange change, const QRectF &)
{
    Q_UNUSED(changed);
    bool wChanged = false;
    bool hChanged = false;
    //### we can only pass changed if the left edge has moved left, or the right edge has moved right
    if (change.horizontalChange())
        wChanged = calcWidth(/*changed*/);
    if (change.verticalChange())
        hChanged = calcHeight(/*changed*/);
    if (wChanged || hChanged)
        updateRect();
}
 
void QQuickContents::itemDestroyed(QQuickItem *item)
{
    if (item)
        QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed);
    calcGeometry();
}
 
void QQuickContents::itemChildRemoved(QQuickItem *, QQuickItem *item)
{
    if (item)
        QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed);
    calcGeometry();
}
 
void QQuickContents::itemChildAdded(QQuickItem *, QQuickItem *item)
{
    if (item)
        QQuickItemPrivate::get(item)->addItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed);
    calcGeometry(item);
}
 
QQuickItemKeyFilter::QQuickItemKeyFilter(QQuickItem *item)
: m_processPost(false), m_next(nullptr)
{
    QQuickItemPrivate *p = item?QQuickItemPrivate::get(item):nullptr;
    if (p) {
        m_next = p->extra.value().keyHandler;
        p->extra->keyHandler = this;
    }
}
 
QQuickItemKeyFilter::~QQuickItemKeyFilter()
{
}
 
void QQuickItemKeyFilter::keyPressed(QKeyEvent *event, bool post)
{
    if (m_next) m_next->keyPressed(event, post);
}
 
void QQuickItemKeyFilter::keyReleased(QKeyEvent *event, bool post)
{
    if (m_next) m_next->keyReleased(event, post);
}
 
#if QT_CONFIG(im)
void QQuickItemKeyFilter::inputMethodEvent(QInputMethodEvent *event, bool post)
{
    if (m_next)
        m_next->inputMethodEvent(event, post);
    else
        event->ignore();
}
 
QVariant QQuickItemKeyFilter::inputMethodQuery(Qt::InputMethodQuery query) const
{
    if (m_next) return m_next->inputMethodQuery(query);
    return QVariant();
}
#endif // im
 
void QQuickItemKeyFilter::shortcutOverrideEvent(QKeyEvent *event)
{
    if (m_next)
        m_next->shortcutOverrideEvent(event);
    else
        event->ignore();
}
 
void QQuickItemKeyFilter::componentComplete()
{
    if (m_next) m_next->componentComplete();
}
QQuickKeyNavigationAttached::QQuickKeyNavigationAttached(QObject *parent)
: QObject(*(new QQuickKeyNavigationAttachedPrivate), parent),
  QQuickItemKeyFilter(qmlobject_cast<QQuickItem*>(parent))
{
    m_processPost = true;
}
 
QQuickKeyNavigationAttached *
QQuickKeyNavigationAttached::qmlAttachedProperties(QObject *obj)
{
    return new QQuickKeyNavigationAttached(obj);
}
 
QQuickItem *QQuickKeyNavigationAttached::left() const
{
    Q_D(const QQuickKeyNavigationAttached);
    return d->left;
}
 
void QQuickKeyNavigationAttached::setLeft(QQuickItem *i)
{
    Q_D(QQuickKeyNavigationAttached);
    if (d->leftSet && d->left == i)
        return;
    d->leftSet = d->left != i;
    d->left = i;
    QQuickKeyNavigationAttached* other =
            qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(i));
    if (other && !other->d_func()->rightSet){
        other->d_func()->right = qobject_cast<QQuickItem*>(parent());
        emit other->rightChanged();
    }
    emit leftChanged();
}
 
QQuickItem *QQuickKeyNavigationAttached::right() const
{
    Q_D(const QQuickKeyNavigationAttached);
    return d->right;
}
 
void QQuickKeyNavigationAttached::setRight(QQuickItem *i)
{
    Q_D(QQuickKeyNavigationAttached);
    if (d->rightSet && d->right == i)
        return;
    d->rightSet = d->right != i;
    d->right = i;
    QQuickKeyNavigationAttached* other =
            qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(i));
    if (other && !other->d_func()->leftSet){
        other->d_func()->left = qobject_cast<QQuickItem*>(parent());
        emit other->leftChanged();
    }
    emit rightChanged();
}
 
QQuickItem *QQuickKeyNavigationAttached::up() const
{
    Q_D(const QQuickKeyNavigationAttached);
    return d->up;
}
 
void QQuickKeyNavigationAttached::setUp(QQuickItem *i)
{
    Q_D(QQuickKeyNavigationAttached);
    if (d->upSet && d->up == i)
        return;
    d->upSet = d->up != i;
    d->up = i;
    QQuickKeyNavigationAttached* other =
            qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(i));
    if (other && !other->d_func()->downSet){
        other->d_func()->down = qobject_cast<QQuickItem*>(parent());
        emit other->downChanged();
    }
    emit upChanged();
}
 
QQuickItem *QQuickKeyNavigationAttached::down() const
{
    Q_D(const QQuickKeyNavigationAttached);
    return d->down;
}
 
void QQuickKeyNavigationAttached::setDown(QQuickItem *i)
{
    Q_D(QQuickKeyNavigationAttached);
    if (d->downSet && d->down == i)
        return;
    d->downSet = d->down != i;
    d->down = i;
    QQuickKeyNavigationAttached* other =
            qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(i));
    if (other && !other->d_func()->upSet) {
        other->d_func()->up = qobject_cast<QQuickItem*>(parent());
        emit other->upChanged();
    }
    emit downChanged();
}
 
QQuickItem *QQuickKeyNavigationAttached::tab() const
{
    Q_D(const QQuickKeyNavigationAttached);
    return d->tab;
}
 
void QQuickKeyNavigationAttached::setTab(QQuickItem *i)
{
    Q_D(QQuickKeyNavigationAttached);
    if (d->tabSet && d->tab == i)
        return;
    d->tabSet = d->tab != i;
    d->tab = i;
    QQuickKeyNavigationAttached* other =
            qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(i));
    if (other && !other->d_func()->backtabSet) {
        other->d_func()->backtab = qobject_cast<QQuickItem*>(parent());
        emit other->backtabChanged();
    }
    emit tabChanged();
}
 
QQuickItem *QQuickKeyNavigationAttached::backtab() const
{
    Q_D(const QQuickKeyNavigationAttached);
    return d->backtab;
}
 
void QQuickKeyNavigationAttached::setBacktab(QQuickItem *i)
{
    Q_D(QQuickKeyNavigationAttached);
    if (d->backtabSet && d->backtab == i)
        return;
    d->backtabSet = d->backtab != i;
    d->backtab = i;
    QQuickKeyNavigationAttached* other =
            qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(i));
    if (other && !other->d_func()->tabSet) {
        other->d_func()->tab = qobject_cast<QQuickItem*>(parent());
        emit other->tabChanged();
    }
    emit backtabChanged();
}
 
QQuickKeyNavigationAttached::Priority QQuickKeyNavigationAttached::priority() const
{
    return m_processPost ? AfterItem : BeforeItem;
}
 
void QQuickKeyNavigationAttached::setPriority(Priority order)
{
    bool processPost = order == AfterItem;
    if (processPost != m_processPost) {
        m_processPost = processPost;
        emit priorityChanged();
    }
}
 
void QQuickKeyNavigationAttached::keyPressed(QKeyEvent *event, bool post)
{
    Q_D(QQuickKeyNavigationAttached);
    event->ignore();
 
    if (post != m_processPost) {
        QQuickItemKeyFilter::keyPressed(event, post);
        return;
    }
 
    bool mirror = false;
    switch (event->key()) {
    case Qt::Key_Left: {
        if (QQuickItem *parentItem = qobject_cast<QQuickItem*>(parent()))
            mirror = QQuickItemPrivate::get(parentItem)->effectiveLayoutMirror;
        QQuickItem* leftItem = mirror ? d->right : d->left;
        if (leftItem) {
            setFocusNavigation(leftItem, mirror ? "right" : "left", mirror ? Qt::TabFocusReason : Qt::BacktabFocusReason);
            event->accept();
        }
        break;
    }
    case Qt::Key_Right: {
        if (QQuickItem *parentItem = qobject_cast<QQuickItem*>(parent()))
            mirror = QQuickItemPrivate::get(parentItem)->effectiveLayoutMirror;
        QQuickItem* rightItem = mirror ? d->left : d->right;
        if (rightItem) {
            setFocusNavigation(rightItem, mirror ? "left" : "right", mirror ? Qt::BacktabFocusReason : Qt::TabFocusReason);
            event->accept();
        }
        break;
    }
    case Qt::Key_Up:
        if (d->up) {
            setFocusNavigation(d->up, "up", Qt::BacktabFocusReason);
            event->accept();
        }
        break;
    case Qt::Key_Down:
        if (d->down) {
            setFocusNavigation(d->down, "down", Qt::TabFocusReason);
            event->accept();
        }
        break;
    case Qt::Key_Tab:
        if (d->tab) {
            setFocusNavigation(d->tab, "tab", Qt::TabFocusReason);
            event->accept();
        }
        break;
    case Qt::Key_Backtab:
        if (d->backtab) {
            setFocusNavigation(d->backtab, "backtab", Qt::BacktabFocusReason);
            event->accept();
        }
        break;
    default:
        break;
    }
 
    if (!event->isAccepted()) QQuickItemKeyFilter::keyPressed(event, post);
}
 
void QQuickKeyNavigationAttached::keyReleased(QKeyEvent *event, bool post)
{
    Q_D(QQuickKeyNavigationAttached);
    event->ignore();
 
    if (post != m_processPost) {
        QQuickItemKeyFilter::keyReleased(event, post);
        return;
    }
 
    bool mirror = false;
    switch (event->key()) {
    case Qt::Key_Left:
        if (QQuickItem *parentItem = qobject_cast<QQuickItem*>(parent()))
            mirror = QQuickItemPrivate::get(parentItem)->effectiveLayoutMirror;
        if (mirror ? d->right : d->left)
            event->accept();
        break;
    case Qt::Key_Right:
        if (QQuickItem *parentItem = qobject_cast<QQuickItem*>(parent()))
            mirror = QQuickItemPrivate::get(parentItem)->effectiveLayoutMirror;
        if (mirror ? d->left : d->right)
            event->accept();
        break;
    case Qt::Key_Up:
        if (d->up) {
            event->accept();
        }
        break;
    case Qt::Key_Down:
        if (d->down) {
            event->accept();
        }
        break;
    case Qt::Key_Tab:
        if (d->tab) {
            event->accept();
        }
        break;
    case Qt::Key_Backtab:
        if (d->backtab) {
            event->accept();
        }
        break;
    default:
        break;
    }
 
    if (!event->isAccepted()) QQuickItemKeyFilter::keyReleased(event, post);
}
 
void QQuickKeyNavigationAttached::setFocusNavigation(QQuickItem *currentItem, const char *dir,
                                                     Qt::FocusReason reason)
{
    QQuickItem *initialItem = currentItem;
    bool isNextItem = false;
    QVector<QQuickItem *> visitedItems;
    do {
        isNextItem = false;
        if (currentItem->isVisible() && currentItem->isEnabled()) {
            currentItem->forceActiveFocus(reason);
        } else {
            QObject *attached =
                qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(currentItem, false);
            if (attached) {
                QQuickItem *tempItem = qvariant_cast<QQuickItem*>(attached->property(dir));
                if (tempItem) {
                    visitedItems.append(currentItem);
                    currentItem = tempItem;
                    isNextItem = true;
                }
            }
        }
    }
    while (currentItem != initialItem && isNextItem && !visitedItems.contains(currentItem));
}
 
struct SigMap {
    int key;
    const char *sig;
};
 
const SigMap sigMap[] = {
    { Qt::Key_Left, "leftPressed" },
    { Qt::Key_Right, "rightPressed" },
    { Qt::Key_Up, "upPressed" },
    { Qt::Key_Down, "downPressed" },
    { Qt::Key_Tab, "tabPressed" },
    { Qt::Key_Backtab, "backtabPressed" },
    { Qt::Key_Asterisk, "asteriskPressed" },
    { Qt::Key_NumberSign, "numberSignPressed" },
    { Qt::Key_Escape, "escapePressed" },
    { Qt::Key_Return, "returnPressed" },
    { Qt::Key_Enter, "enterPressed" },
    { Qt::Key_Delete, "deletePressed" },
    { Qt::Key_Space, "spacePressed" },
    { Qt::Key_Back, "backPressed" },
    { Qt::Key_Cancel, "cancelPressed" },
    { Qt::Key_Select, "selectPressed" },
    { Qt::Key_Yes, "yesPressed" },
    { Qt::Key_No, "noPressed" },
    { Qt::Key_Context1, "context1Pressed" },
    { Qt::Key_Context2, "context2Pressed" },
    { Qt::Key_Context3, "context3Pressed" },
    { Qt::Key_Context4, "context4Pressed" },
    { Qt::Key_Call, "callPressed" },
    { Qt::Key_Hangup, "hangupPressed" },
    { Qt::Key_Flip, "flipPressed" },
    { Qt::Key_Menu, "menuPressed" },
    { Qt::Key_VolumeUp, "volumeUpPressed" },
    { Qt::Key_VolumeDown, "volumeDownPressed" },
    { 0, nullptr }
};
 
QByteArray QQuickKeysAttached::keyToSignal(int key)
{
    QByteArray keySignal;
    if (key >= Qt::Key_0 && key <= Qt::Key_9) {
        keySignal = "digit0Pressed";
        keySignal[5] = '0' + (key - Qt::Key_0);
    } else {
        int i = 0;
        while (sigMap[i].key && sigMap[i].key != key)
            ++i;
        keySignal = sigMap[i].sig;
    }
    return keySignal;
}
 
bool QQuickKeysAttached::isConnected(const char *signalName) const
{
    Q_D(const QQuickKeysAttached);
    int signal_index = d->signalIndex(signalName);
    return d->isSignalConnected(signal_index);
}
 
QQuickKeysAttached::QQuickKeysAttached(QObject *parent)
: QObject(*(new QQuickKeysAttachedPrivate), parent),
  QQuickItemKeyFilter(qmlobject_cast<QQuickItem*>(parent))
{
    Q_D(QQuickKeysAttached);
    m_processPost = false;
    d->item = qmlobject_cast<QQuickItem*>(parent);
    if (d->item != parent)
        qWarning() << "Could not attach Keys property to: " << parent << " is not an Item";
}
 
QQuickKeysAttached::~QQuickKeysAttached()
{
}
 
QQuickKeysAttached::Priority QQuickKeysAttached::priority() const
{
    return m_processPost ? AfterItem : BeforeItem;
}
 
void QQuickKeysAttached::setPriority(Priority order)
{
    bool processPost = order == AfterItem;
    if (processPost != m_processPost) {
        m_processPost = processPost;
        emit priorityChanged();
    }
}
 
void QQuickKeysAttached::componentComplete()
{
#if QT_CONFIG(im)
    Q_D(QQuickKeysAttached);
    if (d->item) {
        for (int ii = 0; ii < d->targets.size(); ++ii) {
            QQuickItem *targetItem = d->targets.at(ii);
            if (targetItem && (targetItem->flags() & QQuickItem::ItemAcceptsInputMethod)) {
                d->item->setFlag(QQuickItem::ItemAcceptsInputMethod);
                break;
            }
        }
    }
#endif
}
 
void QQuickKeysAttached::keyPressed(QKeyEvent *event, bool post)
{
    Q_D(QQuickKeysAttached);
    if (post != m_processPost || !d->enabled || d->inPress) {
        event->ignore();
        QQuickItemKeyFilter::keyPressed(event, post);
        return;
    }
 
    // first process forwards
    if (d->item && d->item->window()) {
        d->inPress = true;
        for (int ii = 0; ii < d->targets.size(); ++ii) {
            QQuickItem *i = d->targets.at(ii);
            if (i && i->isVisible()) {
                event->accept();
                QCoreApplication::sendEvent(i, event);
                if (event->isAccepted()) {
                    d->inPress = false;
                    return;
                }
            }
        }
        d->inPress = false;
    }
 
    QQuickKeyEvent &ke = d->theKeyEvent;
    ke.reset(*event);
    QByteArray keySignal = keyToSignal(event->key());
    if (!keySignal.isEmpty()) {
        keySignal += "(QQuickKeyEvent*)";
        if (isConnected(keySignal)) {
            // If we specifically handle a key then default to accepted
            ke.setAccepted(true);
            int idx = QQuickKeysAttached::staticMetaObject.indexOfSignal(keySignal);
            metaObject()->method(idx).invoke(this, Qt::DirectConnection, Q_ARG(QQuickKeyEvent*, &ke));
        }
    }
    if (!ke.isAccepted())
        emit pressed(&ke);
    event->setAccepted(ke.isAccepted());
 
    if (!event->isAccepted()) QQuickItemKeyFilter::keyPressed(event, post);
}
 
void QQuickKeysAttached::keyReleased(QKeyEvent *event, bool post)
{
    Q_D(QQuickKeysAttached);
    if (post != m_processPost || !d->enabled || d->inRelease) {
        event->ignore();
        QQuickItemKeyFilter::keyReleased(event, post);
        return;
    }
 
    if (d->item && d->item->window()) {
        d->inRelease = true;
        for (int ii = 0; ii < d->targets.size(); ++ii) {
            QQuickItem *i = d->targets.at(ii);
            if (i && i->isVisible()) {
                event->accept();
                QCoreApplication::sendEvent(i, event);
                if (event->isAccepted()) {
                    d->inRelease = false;
                    return;
                }
            }
        }
        d->inRelease = false;
    }
 
    QQuickKeyEvent &ke = d->theKeyEvent;
    ke.reset(*event);
    emit released(&ke);
    event->setAccepted(ke.isAccepted());
 
    if (!event->isAccepted()) QQuickItemKeyFilter::keyReleased(event, post);
}
 
#if QT_CONFIG(im)
void QQuickKeysAttached::inputMethodEvent(QInputMethodEvent *event, bool post)
{
    Q_D(QQuickKeysAttached);
    if (post == m_processPost && d->item && !d->inIM && d->item->window()) {
        d->inIM = true;
        for (int ii = 0; ii < d->targets.size(); ++ii) {
            QQuickItem *targetItem = d->targets.at(ii);
            if (targetItem && targetItem->isVisible() && (targetItem->flags() & QQuickItem::ItemAcceptsInputMethod)) {
                QCoreApplication::sendEvent(targetItem, event);
                if (event->isAccepted()) {
                    d->imeItem = targetItem;
                    d->inIM = false;
                    return;
                }
            }
        }
        d->inIM = false;
    }
    QQuickItemKeyFilter::inputMethodEvent(event, post);
}
 
QVariant QQuickKeysAttached::inputMethodQuery(Qt::InputMethodQuery query) const
{
    Q_D(const QQuickKeysAttached);
    if (d->item) {
        for (int ii = 0; ii < d->targets.size(); ++ii) {
            QQuickItem *i = d->targets.at(ii);
            if (i && i->isVisible() && (i->flags() & QQuickItem::ItemAcceptsInputMethod) && i == d->imeItem) {
                //### how robust is i == d->imeItem check?
                QVariant v = i->inputMethodQuery(query);
                if (v.userType() == QMetaType::QRectF)
                    v = d->item->mapRectFromItem(i, v.toRectF());  //### cost?
                return v;
            }
        }
    }
    return QQuickItemKeyFilter::inputMethodQuery(query);
}
#endif // im
 
void QQuickKeysAttached::shortcutOverrideEvent(QKeyEvent *event)
{
    Q_D(QQuickKeysAttached);
    QQuickKeyEvent &keyEvent = d->theKeyEvent;
    keyEvent.reset(*event);
    emit shortcutOverride(&keyEvent);
 
    event->setAccepted(keyEvent.isAccepted());
}
 
QQuickKeysAttached *QQuickKeysAttached::qmlAttachedProperties(QObject *obj)
{
    return new QQuickKeysAttached(obj);
}
 
QQuickLayoutMirroringAttached::QQuickLayoutMirroringAttached(QObject *parent) : QObject(parent), itemPrivate(nullptr)
{
    if (QQuickItem *item = qobject_cast<QQuickItem *>(parent))
        itemPrivate = QQuickItemPrivate::get(item);
    else if (QQuickWindow *window = qobject_cast<QQuickWindow *>(parent))
        itemPrivate = QQuickItemPrivate::get(window->contentItem());
 
    if (itemPrivate)
        itemPrivate->extra.value().layoutDirectionAttached = this;
    else
        qmlWarning(parent) << tr("LayoutDirection attached property only works with Items and Windows");
}
 
QQuickLayoutMirroringAttached * QQuickLayoutMirroringAttached::qmlAttachedProperties(QObject *object)
{
    return new QQuickLayoutMirroringAttached(object);
}
 
bool QQuickLayoutMirroringAttached::enabled() const
{
    return itemPrivate ? itemPrivate->effectiveLayoutMirror : false;
}
 
void QQuickLayoutMirroringAttached::setEnabled(bool enabled)
{
    if (!itemPrivate)
        return;
 
    itemPrivate->isMirrorImplicit = false;
    if (enabled != itemPrivate->effectiveLayoutMirror) {
        itemPrivate->setLayoutMirror(enabled);
        if (itemPrivate->inheritMirrorFromItem)
             itemPrivate->resolveLayoutMirror();
    }
}
 
void QQuickLayoutMirroringAttached::resetEnabled()
{
    if (itemPrivate && !itemPrivate->isMirrorImplicit) {
        itemPrivate->isMirrorImplicit = true;
        itemPrivate->resolveLayoutMirror();
    }
}
 
bool QQuickLayoutMirroringAttached::childrenInherit() const
{
    return itemPrivate ? itemPrivate->inheritMirrorFromItem : false;
}
 
void QQuickLayoutMirroringAttached::setChildrenInherit(bool childrenInherit) {
    if (itemPrivate && childrenInherit != itemPrivate->inheritMirrorFromItem) {
        itemPrivate->inheritMirrorFromItem = childrenInherit;
        itemPrivate->resolveLayoutMirror();
        childrenInheritChanged();
    }
}
 
void QQuickItemPrivate::resolveLayoutMirror()
{
    Q_Q(QQuickItem);
    if (QQuickItem *parentItem = q->parentItem()) {
        QQuickItemPrivate *parentPrivate = QQuickItemPrivate::get(parentItem);
        setImplicitLayoutMirror(parentPrivate->inheritedLayoutMirror, parentPrivate->inheritMirrorFromParent);
    } else {
        setImplicitLayoutMirror(isMirrorImplicit ? false : effectiveLayoutMirror, inheritMirrorFromItem);
    }
}
 
void QQuickItemPrivate::setImplicitLayoutMirror(bool mirror, bool inherit)
{
    inherit = inherit || inheritMirrorFromItem;
    if (!isMirrorImplicit && inheritMirrorFromItem)
        mirror = effectiveLayoutMirror;
    if (mirror == inheritedLayoutMirror && inherit == inheritMirrorFromParent)
        return;
 
    inheritMirrorFromParent = inherit;
    inheritedLayoutMirror = inheritMirrorFromParent ? mirror : false;
 
    if (isMirrorImplicit)
        setLayoutMirror(inherit ? inheritedLayoutMirror : false);
    for (int i = 0; i < childItems.size(); ++i) {
        if (QQuickItem *child = qmlobject_cast<QQuickItem *>(childItems.at(i))) {
            QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(child);
            childPrivate->setImplicitLayoutMirror(inheritedLayoutMirror, inheritMirrorFromParent);
        }
    }
}
 
void QQuickItemPrivate::setLayoutMirror(bool mirror)
{
    if (mirror != effectiveLayoutMirror) {
        effectiveLayoutMirror = mirror;
        if (_anchors) {
            QQuickAnchorsPrivate *anchor_d = QQuickAnchorsPrivate::get(_anchors);
            anchor_d->fillChanged();
            anchor_d->centerInChanged();
            anchor_d->updateHorizontalAnchors();
        }
        mirrorChange();
        if (extra.isAllocated() && extra->layoutDirectionAttached) {
            emit extra->layoutDirectionAttached->enabledChanged();
        }
    }
}
 
QQuickEnterKeyAttached::QQuickEnterKeyAttached(QObject *parent)
    : QObject(parent), itemPrivate(nullptr), keyType(Qt::EnterKeyDefault)
{
    if (QQuickItem *item = qobject_cast<QQuickItem*>(parent)) {
        itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->extra.value().enterKeyAttached = this;
    } else
        qmlWarning(parent) << tr("EnterKey attached property only works with Items");
}
 
QQuickEnterKeyAttached *QQuickEnterKeyAttached::qmlAttachedProperties(QObject *object)
{
    return new QQuickEnterKeyAttached(object);
}
 
Qt::EnterKeyType QQuickEnterKeyAttached::type() const
{
    return keyType;
}
 
void QQuickEnterKeyAttached::setType(Qt::EnterKeyType type)
{
    if (keyType != type) {
        keyType = type;
#if QT_CONFIG(im)
        if (itemPrivate && itemPrivate->activeFocus)
            QGuiApplication::inputMethod()->update(Qt::ImEnterKeyType);
#endif
        typeChanged();
    }
}
 
void QQuickItemPrivate::setAccessible()
{
    isAccessible = true;
}
 
void QQuickItemPrivate::updateSubFocusItem(QQuickItem *scope, bool focus)
{
    Q_Q(QQuickItem);
    Q_ASSERT(scope);
 
    QQuickItemPrivate *scopePrivate = QQuickItemPrivate::get(scope);
 
    QQuickItem *oldSubFocusItem = scopePrivate->subFocusItem;
    // Correct focus chain in scope
    if (oldSubFocusItem) {
        QQuickItem *sfi = scopePrivate->subFocusItem->parentItem();
        while (sfi && sfi != scope) {
            QQuickItemPrivate::get(sfi)->subFocusItem = nullptr;
            sfi = sfi->parentItem();
        }
    }
 
    if (focus) {
        scopePrivate->subFocusItem = q;
        QQuickItem *sfi = scopePrivate->subFocusItem->parentItem();
        while (sfi && sfi != scope) {
            QQuickItemPrivate::get(sfi)->subFocusItem = q;
            sfi = sfi->parentItem();
        }
    } else {
        scopePrivate->subFocusItem = nullptr;
    }
}
 
 
bool QQuickItemPrivate::setFocusIfNeeded(QEvent::Type eventType)
{
    Q_Q(QQuickItem);
    const bool setFocusOnRelease = QGuiApplication::styleHints()->setFocusOnTouchRelease();
    Qt::FocusPolicy policy = Qt::ClickFocus;
 
    switch (eventType) {
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonDblClick:
        case QEvent::TouchBegin:
            if (setFocusOnRelease)
                return false;
            break;
        case QEvent::MouseButtonRelease:
        case QEvent::TouchEnd:
            if (!setFocusOnRelease)
                return false;
            break;
        case QEvent::Wheel:
            policy = Qt::WheelFocus;
            break;
        default:
            break;
    }
 
    if ((focusPolicy & policy) == policy) {
        setActiveFocus(q, Qt::MouseFocusReason);
        return true;
    }
 
    return false;
}
 
Qt::FocusReason QQuickItemPrivate::lastFocusChangeReason() const
{
    return static_cast<Qt::FocusReason>(focusReason);
}
 
void QQuickItemPrivate::setLastFocusChangeReason(Qt::FocusReason reason)
{
    if (focusReason == reason)
        return;
 
    focusReason = reason;
}
 
QQuickItem::QQuickItem(QQuickItem* parent)
: QObject(*(new QQuickItemPrivate), parent)
{
    Q_D(QQuickItem);
    d->init(parent);
}
 
QQuickItem::QQuickItem(QQuickItemPrivate &dd, QQuickItem *parent)
: QObject(dd, parent)
{
    Q_D(QQuickItem);
    d->init(parent);
}
 
QQuickItem::~QQuickItem()
{
    Q_D(QQuickItem);
    d->inDestructor = true;
 
    if (d->windowRefCount > 1)
        d->windowRefCount = 1; // Make sure window is set to null in next call to derefWindow().
    if (d->parentItem)
        setParentItem(nullptr);
    else if (d->window)
        d->derefWindow();
 
    for (QQuickItem *child : std::as_const(d->childItems))
        child->setParentItem(nullptr);
    d->childItems.clear();
 
    d->notifyChangeListeners(QQuickItemPrivate::AllChanges, [this](const QQuickItemPrivate::ChangeListener &change){
        QQuickAnchorsPrivate *anchor = change.listener->anchorPrivate();
        if (anchor)
            anchor->clearItem(this);
    });
    /*
        update item anchors that depended on us unless they are our child (and will also be destroyed),
        or our sibling, and our parent is also being destroyed.
    */
    d->notifyChangeListeners(QQuickItemPrivate::AllChanges, [this](const QQuickItemPrivate::ChangeListener &change){
        QQuickAnchorsPrivate *anchor = change.listener->anchorPrivate();
        if (anchor && anchor->item && anchor->item->parentItem() && anchor->item->parentItem() != this)
            anchor->update();
    });
    d->notifyChangeListeners(QQuickItemPrivate::Destroyed, &QQuickItemChangeListener::itemDestroyed, this);
    d->changeListeners.clear();
 
    /*
       Remove any references our transforms have to us, in case they try to
       remove themselves from our list of transforms when that list has already
       been destroyed after ~QQuickItem() has run.
    */
    for (int ii = 0; ii < d->transforms.size(); ++ii) {
        QQuickTransform *t = d->transforms.at(ii);
        QQuickTransformPrivate *tp = QQuickTransformPrivate::get(t);
        tp->items.removeOne(this);
    }
 
    if (d->extra.isAllocated()) {
        delete d->extra->contents; d->extra->contents = nullptr;
#if QT_CONFIG(quick_shadereffect)
        delete d->extra->layer; d->extra->layer = nullptr;
#endif
    }
 
    delete d->_anchors; d->_anchors = nullptr;
    delete d->_stateGroup; d->_stateGroup = nullptr;
 
    d->isQuickItem = false;
}
 
bool QQuickItemPrivate::canAcceptTabFocus(QQuickItem *item)
{
    if (!item->window())
        return false;
 
    if (item == item->window()->contentItem())
        return true;
 
#if QT_CONFIG(accessibility)
    QAccessible::Role role = QQuickItemPrivate::get(item)->effectiveAccessibleRole();
    if (role == QAccessible::EditableText || role == QAccessible::Table || role == QAccessible::List) {
        return true;
    } else if (role == QAccessible::ComboBox || role == QAccessible::SpinBox) {
        if (QAccessibleInterface *iface = QAccessible::queryAccessibleInterface(item))
            return iface->state().editable;
    }
#endif
 
    QVariant editable = item->property("editable");
    if (editable.isValid())
        return editable.toBool();
 
    QVariant readonly = item->property("readOnly");
    if (readonly.isValid() && !readonly.toBool() && item->property("text").isValid())
        return true;
 
    return false;
}
 
bool QQuickItemPrivate::focusNextPrev(QQuickItem *item, bool forward)
{
    QQuickWindow *window = item->window();
    const bool wrap = !window || window->isTopLevel();
 
    QQuickItem *next = QQuickItemPrivate::nextPrevItemInTabFocusChain(item, forward, wrap);
 
    if (next == item)
        return false;
 
    const auto reason = forward ? Qt::TabFocusReason : Qt::BacktabFocusReason;
 
    if (!wrap && !next) {
        // Focus chain wrapped and we are not top-level window
        // Give focus to parent window
        Q_ASSERT(window);
        Q_ASSERT(window->parent());
 
 
        qt_window_private(window->parent())->setFocusToTarget(
            forward ? QWindowPrivate::FocusTarget::Next
                    : QWindowPrivate::FocusTarget::Prev,
            reason);
        window->parent()->requestActivate();
        return true;
    }
 
    next->forceActiveFocus(reason);
 
    return true;
}
 
QQuickItem *QQuickItemPrivate::nextTabChildItem(const QQuickItem *item, int start)
{
    if (!item) {
        qWarning() << "QQuickItemPrivate::nextTabChildItem called with null item.";
        return nullptr;
    }
    const QList<QQuickItem *> &children = item->childItems();
    const int count = children.size();
    if (start < 0 || start >= count) {
        qWarning() << "QQuickItemPrivate::nextTabChildItem: Start index value out of range for item" << item;
        return nullptr;
    }
    while (start < count) {
        QQuickItem *child = children.at(start);
        if (!child->d_func()->isTabFence)
            return child;
        ++start;
    }
    return nullptr;
}
 
QQuickItem *QQuickItemPrivate::prevTabChildItem(const QQuickItem *item, int start)
{
    if (!item) {
        qWarning() << "QQuickItemPrivate::prevTabChildItem called with null item.";
        return nullptr;
    }
    const QList<QQuickItem *> &children = item->childItems();
    const int count = children.size();
    if (start == -1)
        start = count - 1;
    if (start < 0 || start >= count) {
        qWarning() << "QQuickItemPrivate::prevTabChildItem: Start index value out of range for item" << item;
        return nullptr;
    }
    while (start >= 0) {
        QQuickItem *child = children.at(start);
        if (!child->d_func()->isTabFence)
            return child;
        --start;
    }
    return nullptr;
}
 
QQuickItem* QQuickItemPrivate::nextPrevItemInTabFocusChain(QQuickItem *item, bool forward, bool wrap)
{
    Q_ASSERT(item);
    qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: item:" << item << ", forward:" << forward;
 
    if (!item->window())
        return item;
    const QQuickItem * const contentItem = item->window()->contentItem();
    if (!contentItem)
        return item;
 
    bool all = QGuiApplication::styleHints()->tabFocusBehavior() == Qt::TabFocusAllControls;
 
    QQuickItem *from = nullptr;
    bool isTabFence = item->d_func()->isTabFence;
    if (forward) {
        if (!isTabFence)
            from = item->parentItem();
    } else {
        if (!item->childItems().isEmpty())
            from = item->d_func()->childItems.constFirst();
        else if (!isTabFence)
            from = item->parentItem();
    }
    bool skip = false;
 
    QQuickItem *startItem = item;
    QQuickItem *originalStartItem = startItem;
    // Protect from endless loop:
    // If we start on an invisible item we will not find it again.
    // If there is no other item which can become the focus item, we have a forever loop,
    // since the protection only works if we encounter the first item again.
    while (startItem && !startItem->isVisible()) {
        startItem = startItem->parentItem();
    }
    if (!startItem)
        return item;
 
    QQuickItem *firstFromItem = from;
    QQuickItem *current = item;
    qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: startItem:" << startItem;
    qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: firstFromItem:" << firstFromItem;
    QDuplicateTracker<QQuickItem *> cycleDetector;
    do {
        qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: current:" << current;
        qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: from:" << from;
        skip = false;
        QQuickItem *last = current;
 
        bool hasChildren = !current->childItems().isEmpty() && current->isEnabled() && current->isVisible();
        QQuickItem *firstChild = nullptr;
        QQuickItem *lastChild = nullptr;
        if (hasChildren) {
            firstChild = nextTabChildItem(current, 0);
            if (!firstChild)
                hasChildren = false;
            else
                lastChild = prevTabChildItem(current, -1);
        }
        isTabFence = current->d_func()->isTabFence;
        if (isTabFence && !hasChildren)
            return current;
 
        // coming from parent: check children
        if (hasChildren && from == current->parentItem()) {
            if (forward) {
                current = firstChild;
            } else {
                current = lastChild;
                if (!current->childItems().isEmpty())
                    skip = true;
            }
        } else if (hasChildren && forward && from != lastChild) {
            // not last child going forwards
            int nextChild = current->childItems().indexOf(from) + 1;
            current = nextTabChildItem(current, nextChild);
        } else if (hasChildren && !forward && from != firstChild) {
            // not first child going backwards
            int prevChild = current->childItems().indexOf(from) - 1;
            current = prevTabChildItem(current, prevChild);
            if (!current->childItems().isEmpty())
                skip = true;
        // back to the parent
        } else if (QQuickItem *parent = !isTabFence ? current->parentItem() : nullptr) {
            // we would evaluate the parent twice, thus we skip
            if (forward) {
                skip = true;
            } else if (QQuickItem *firstSibling = !forward ? nextTabChildItem(parent, 0) : nullptr) {
                if (last != firstSibling
                    || (parent->isFocusScope() && parent->activeFocusOnTab() && parent->hasActiveFocus()))
                        skip = true;
            }
            current = parent;
        } else if (hasChildren) {
            if (!wrap && (forward || firstFromItem != from)) {
                qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain:"
                                 << "Focus chain about to wrap.";
                // If focus chain wraps, we should give the parent window
                // a chance to get focus, so we should stop here
                return nullptr;
            }
 
            // Wrap around after checking all items forward
            if (forward) {
                current = firstChild;
            } else {
                current = lastChild;
                if (!current->childItems().isEmpty())
                    skip = true;
            }
        }
        from = last;
        // if [from] item is equal to [firstFromItem], means we have traversed one path and
        // jump back to parent of the chain, and then we have to check whether we have
        // traversed all of the chain (by compare the [current] item with [startItem])
        // Since the [startItem] might be promoted to its parent if it is invisible,
        // we still have to check [current] item with original start item
        // We might also run into a cycle before we reach firstFromItem again
        // but note that we have to ignore current if we are meant to skip it
        if (((current == startItem || current == originalStartItem) && from == firstFromItem) ||
                (!skip && cycleDetector.hasSeen(current))) {
            // wrapped around, avoid endless loops
            if (item == contentItem) {
                qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: looped, return contentItem";
                return item;
            } else {
                qCDebug(lcFocus) << "QQuickItemPrivate::nextPrevItemInTabFocusChain: looped, return " << startItem;
                return startItem;
            }
        }
        if (!firstFromItem) {
            if (startItem->d_func()->isTabFence) {
                if (current == startItem)
                    firstFromItem = from;
            } else { //start from root
                startItem = current;
                firstFromItem = from;
            }
        }
    } while (skip || !current->activeFocusOnTab() || !current->isEnabled() || !current->isVisible()
                  || !(all || QQuickItemPrivate::canAcceptTabFocus(current)));
 
    return current;
}
 
QQuickItem *QQuickItem::parentItem() const
{
    Q_D(const QQuickItem);
    return d->parentItem;
}
 
void QQuickItem::setParentItem(QQuickItem *parentItem)
{
    Q_D(QQuickItem);
    if (parentItem == d->parentItem)
        return;
 
    if (parentItem) {
        QQuickItem *itemAncestor = parentItem;
        while (itemAncestor != nullptr) {
            if (Q_UNLIKELY(itemAncestor == this)) {
                qWarning() << "QQuickItem::setParentItem: Parent" << parentItem << "is already part of the subtree of" << this;
                return;
            }
            itemAncestor = itemAncestor->parentItem();
        }
    }
 
    d->removeFromDirtyList();
 
    QQuickItem *oldParentItem = d->parentItem;
    QQuickItem *scopeFocusedItem = nullptr;
 
    if (oldParentItem) {
        QQuickItemPrivate *op = QQuickItemPrivate::get(oldParentItem);
 
        QQuickItem *scopeItem = nullptr;
 
        if (hasFocus() || op->subFocusItem == this)
            scopeFocusedItem = this;
        else if (!isFocusScope() && d->subFocusItem)
            scopeFocusedItem = d->subFocusItem;
 
        if (scopeFocusedItem) {
            scopeItem = oldParentItem;
            while (!scopeItem->isFocusScope() && scopeItem->parentItem())
                scopeItem = scopeItem->parentItem();
            if (d->window) {
                d->deliveryAgentPrivate()->
                        clearFocusInScope(scopeItem, scopeFocusedItem, Qt::OtherFocusReason,
                                          QQuickDeliveryAgentPrivate::DontChangeFocusProperty);
                if (scopeFocusedItem != this)
                    QQuickItemPrivate::get(scopeFocusedItem)->updateSubFocusItem(this, true);
            } else {
                QQuickItemPrivate::get(scopeFocusedItem)->updateSubFocusItem(scopeItem, false);
            }
        }
 
        const bool wasVisible = isVisible();
        op->removeChild(this);
        if (wasVisible && !op->inDestructor)
            emit oldParentItem->visibleChildrenChanged();
    } else if (d->window) {
        QQuickWindowPrivate::get(d->window)->parentlessItems.remove(this);
    }
 
    QQuickWindow *parentWindow = parentItem ? QQuickItemPrivate::get(parentItem)->window : nullptr;
    bool alreadyAddedChild = false;
    if (d->window == parentWindow) {
        // Avoid freeing and reallocating resources if the window stays the same.
        d->parentItem = parentItem;
    } else {
        auto oldParentItem = d->parentItem;
        d->parentItem = parentItem;
        if (d->parentItem) {
            QQuickItemPrivate::get(d->parentItem)->addChild(this);
            alreadyAddedChild = true;
        }
        if (d->window) {
            d->derefWindow();
            // as we potentially changed d->parentWindow above
            // the check in derefWindow could not work
            // thus, we redo it here with the old parent
            // Also, the window may have been deleted by derefWindow()
            if (!oldParentItem && d->window) {
                QQuickWindowPrivate::get(d->window)->parentlessItems.remove(this);
            }
        }
        if (parentWindow)
            d->refWindow(parentWindow);
    }
 
    d->dirty(QQuickItemPrivate::ParentChanged);
 
    if (d->parentItem && !alreadyAddedChild)
        QQuickItemPrivate::get(d->parentItem)->addChild(this);
    else if (d->window && !alreadyAddedChild)
        QQuickWindowPrivate::get(d->window)->parentlessItems.insert(this);
 
    d->setEffectiveVisibleRecur(d->calcEffectiveVisible());
    d->setEffectiveEnableRecur(nullptr, d->calcEffectiveEnable());
 
    if (d->parentItem) {
        if (!scopeFocusedItem) {
            if (hasFocus())
                scopeFocusedItem = this;
            else if (!isFocusScope() && d->subFocusItem)
                scopeFocusedItem = d->subFocusItem;
        }
 
        if (scopeFocusedItem) {
            // We need to test whether this item becomes scope focused
            QQuickItem *scopeItem = d->parentItem;
            while (!scopeItem->isFocusScope() && scopeItem->parentItem())
                scopeItem = scopeItem->parentItem();
 
            if (QQuickItemPrivate::get(scopeItem)->subFocusItem
                    || (!scopeItem->isFocusScope() && scopeItem->hasFocus())) {
                if (scopeFocusedItem != this)
                    QQuickItemPrivate::get(scopeFocusedItem)->updateSubFocusItem(this, false);
                QQuickItemPrivate::get(scopeFocusedItem)->focus = false;
                emit scopeFocusedItem->focusChanged(false);
            } else {
                if (d->window) {
                    d->deliveryAgentPrivate()->
                            setFocusInScope(scopeItem, scopeFocusedItem, Qt::OtherFocusReason,
                                            QQuickDeliveryAgentPrivate::DontChangeFocusProperty);
                } else {
                    QQuickItemPrivate::get(scopeFocusedItem)->updateSubFocusItem(scopeItem, true);
                }
            }
        }
    }
 
    if (d->parentItem)
        d->resolveLayoutMirror();
 
    d->itemChange(ItemParentHasChanged, d->parentItem);
 
    if (!d->inDestructor)
        emit parentChanged(d->parentItem);
    if (isVisible() && d->parentItem && !QQuickItemPrivate::get(d->parentItem)->inDestructor)
        emit d->parentItem->visibleChildrenChanged();
}
 
void QQuickItem::stackBefore(const QQuickItem *sibling)
{
    Q_D(QQuickItem);
    if (!sibling || sibling == this || !d->parentItem || d->parentItem != QQuickItemPrivate::get(sibling)->parentItem) {
        qWarning().nospace() << "QQuickItem::stackBefore: Cannot stack "
            << this << " before " << sibling << ", which must be a sibling";
        return;
    }
 
    QQuickItemPrivate *parentPrivate = QQuickItemPrivate::get(d->parentItem);
 
    int myIndex = parentPrivate->childItems.lastIndexOf(this);
    int siblingIndex = parentPrivate->childItems.lastIndexOf(const_cast<QQuickItem *>(sibling));
 
    Q_ASSERT(myIndex != -1 && siblingIndex != -1);
 
    if (myIndex == siblingIndex - 1)
        return;
 
    parentPrivate->childItems.move(myIndex, myIndex < siblingIndex ? siblingIndex - 1 : siblingIndex);
 
    parentPrivate->markSortedChildrenDirty(this);
    parentPrivate->dirty(QQuickItemPrivate::ChildrenStackingChanged);
 
    for (int ii = qMin(siblingIndex, myIndex); ii < parentPrivate->childItems.size(); ++ii)
        QQuickItemPrivate::get(parentPrivate->childItems.at(ii))->siblingOrderChanged();
}
 
void QQuickItem::stackAfter(const QQuickItem *sibling)
{
    Q_D(QQuickItem);
    if (!sibling || sibling == this || !d->parentItem || d->parentItem != QQuickItemPrivate::get(sibling)->parentItem) {
        qWarning().nospace() << "QQuickItem::stackAfter: Cannot stack "
            << this << " after " << sibling << ", which must be a sibling";
        return;
    }
 
    QQuickItemPrivate *parentPrivate = QQuickItemPrivate::get(d->parentItem);
 
    int myIndex = parentPrivate->childItems.lastIndexOf(this);
    int siblingIndex = parentPrivate->childItems.lastIndexOf(const_cast<QQuickItem *>(sibling));
 
    Q_ASSERT(myIndex != -1 && siblingIndex != -1);
 
    if (myIndex == siblingIndex + 1)
        return;
 
    parentPrivate->childItems.move(myIndex, myIndex > siblingIndex ? siblingIndex + 1 : siblingIndex);
 
    parentPrivate->markSortedChildrenDirty(this);
    parentPrivate->dirty(QQuickItemPrivate::ChildrenStackingChanged);
 
    for (int ii = qMin(myIndex, siblingIndex + 1); ii < parentPrivate->childItems.size(); ++ii)
        QQuickItemPrivate::get(parentPrivate->childItems.at(ii))->siblingOrderChanged();
}
 
QQuickWindow *QQuickItem::window() const
{
    Q_D(const QQuickItem);
    return d->window;
}
 
static bool itemZOrder_sort(QQuickItem *lhs, QQuickItem *rhs)
{
    return lhs->z() < rhs->z();
}
 
QList<QQuickItem *> QQuickItemPrivate::paintOrderChildItems() const
{
    if (sortedChildItems)
        return *sortedChildItems;
 
    // If none of the items have set Z then the paint order list is the same as
    // the childItems list.  This is by far the most common case.
    bool haveZ = false;
    for (int i = 0; i < childItems.size(); ++i) {
        if (QQuickItemPrivate::get(childItems.at(i))->z() != 0.) {
            haveZ = true;
            break;
        }
    }
    if (haveZ) {
        sortedChildItems = new QList<QQuickItem*>(childItems);
        std::stable_sort(sortedChildItems->begin(), sortedChildItems->end(), itemZOrder_sort);
        return *sortedChildItems;
    }
 
    sortedChildItems = const_cast<QList<QQuickItem*>*>(&childItems);
 
    return childItems;
}
 
void QQuickItemPrivate::addChild(QQuickItem *child)
{
    Q_Q(QQuickItem);
 
    Q_ASSERT(!childItems.contains(child));
 
    childItems.append(child);
 
    QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(child);
 
#if QT_CONFIG(cursor)
    // if the added child has a cursor and we do not currently have any children
    // with cursors, bubble the notification up
    if (childPrivate->subtreeCursorEnabled && !subtreeCursorEnabled)
        setHasCursorInChild(true);
#endif
 
    if (childPrivate->subtreeHoverEnabled && !subtreeHoverEnabled)
        setHasHoverInChild(true);
 
    childPrivate->recursiveRefFromEffectItem(extra.value().recursiveEffectRefCount);
    markSortedChildrenDirty(child);
    dirty(QQuickItemPrivate::ChildrenChanged);
 
    itemChange(QQuickItem::ItemChildAddedChange, child);
 
    emit q->childrenChanged();
}
 
void QQuickItemPrivate::removeChild(QQuickItem *child)
{
    Q_Q(QQuickItem);
 
    Q_ASSERT(child);
    if (!inDestructor) {
        // if we are getting destroyed, then the destructor will clear the list
        Q_ASSERT(childItems.contains(child));
        childItems.removeOne(child);
        Q_ASSERT(!childItems.contains(child));
    }
 
    QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(child);
 
#if QT_CONFIG(cursor)
    // turn it off, if nothing else is using it
    if (childPrivate->subtreeCursorEnabled && subtreeCursorEnabled)
        setHasCursorInChild(false);
#endif
 
    if (childPrivate->subtreeHoverEnabled && subtreeHoverEnabled)
        setHasHoverInChild(false);
 
    childPrivate->recursiveRefFromEffectItem(-extra.value().recursiveEffectRefCount);
    if (!inDestructor) {
        markSortedChildrenDirty(child);
        dirty(QQuickItemPrivate::ChildrenChanged);
    }
 
    itemChange(QQuickItem::ItemChildRemovedChange, child);
 
    if (!inDestructor)
        emit q->childrenChanged();
}
 
void QQuickItemPrivate::refWindow(QQuickWindow *c)
{
    // An item needs a window if it is referenced by another item which has a window.
    // Typically the item is referenced by a parent, but can also be referenced by a
    // ShaderEffect or ShaderEffectSource. 'windowRefCount' counts how many items with
    // a window is referencing this item. When the reference count goes from zero to one,
    // or one to zero, the window of this item is updated and propagated to the children.
    // As long as the reference count stays above zero, the window is unchanged.
    // refWindow() increments the reference count.
    // derefWindow() decrements the reference count.
 
    Q_Q(QQuickItem);
    Q_ASSERT((window != nullptr) == (windowRefCount > 0));
    Q_ASSERT(c);
    if (++windowRefCount > 1) {
        if (c != window)
            qWarning("QQuickItem: Cannot use same item on different windows at the same time.");
        return; // Window already set.
    }
 
    Q_ASSERT(window == nullptr);
    window = c;
 
    if (polishScheduled)
        QQuickWindowPrivate::get(window)->itemsToPolish.append(q);
 
    if (!parentItem)
        QQuickWindowPrivate::get(window)->parentlessItems.insert(q);
 
    for (int ii = 0; ii < childItems.size(); ++ii) {
        QQuickItem *child = childItems.at(ii);
        QQuickItemPrivate::get(child)->refWindow(c);
    }
 
    dirty(Window);
 
    if (extra.isAllocated() && extra->screenAttached)
        extra->screenAttached->windowChanged(c);
    itemChange(QQuickItem::ItemSceneChange, c);
}
 
void QQuickItemPrivate::derefWindow()
{
    Q_Q(QQuickItem);
    Q_ASSERT((window != nullptr) == (windowRefCount > 0));
 
    if (!window)
        return; // This can happen when destroying recursive shader effect sources.
 
    if (--windowRefCount > 0)
        return; // There are still other references, so don't set window to null yet.
 
    q->releaseResources();
    removeFromDirtyList();
    QQuickWindowPrivate *c = QQuickWindowPrivate::get(window);
    if (polishScheduled)
        c->itemsToPolish.removeOne(q);
#if QT_CONFIG(cursor)
    if (c->cursorItem == q) {
        c->cursorItem = nullptr;
        window->unsetCursor();
    }
#endif
    if (itemNodeInstance)
        c->cleanup(itemNodeInstance);
    if (!parentItem)
        c->parentlessItems.remove(q);
 
    window = nullptr;
 
    itemNodeInstance = nullptr;
 
    if (extra.isAllocated()) {
        extra->opacityNode = nullptr;
        extra->clipNode = nullptr;
        extra->rootNode = nullptr;
    }
 
    paintNode = nullptr;
 
    for (int ii = 0; ii < childItems.size(); ++ii) {
        if (QQuickItem *child = childItems.at(ii))
            QQuickItemPrivate::get(child)->derefWindow();
    }
 
    dirty(Window);
 
    if (extra.isAllocated() && extra->screenAttached)
        extra->screenAttached->windowChanged(nullptr);
    itemChange(QQuickItem::ItemSceneChange, (QQuickWindow *)nullptr);
}
 
 
QTransform QQuickItemPrivate::windowToItemTransform() const
{
    // XXX todo - optimize
    return itemToWindowTransform().inverted();
}
 
QTransform QQuickItemPrivate::itemToWindowTransform() const
{
    // item's parent must not be itself, otherwise calling itemToWindowTransform() on it is infinite recursion
    Q_ASSERT(!parentItem || QQuickItemPrivate::get(parentItem) != this);
    QTransform rv = parentItem ? QQuickItemPrivate::get(parentItem)->itemToWindowTransform() : QTransform();
    itemToParentTransform(&rv);
    return rv;
}
 
void QQuickItemPrivate::itemToParentTransform(QTransform *t) const
{
    /* Read the current x and y values. As this is an internal method,
       we don't care about it being usable in bindings. Instead, we
       care about performance here, and thus we read the value with
       valueBypassingBindings. This avoids any checks whether we are
       in a binding (which sholdn't be too expensive, but can add up).
    */
 
    qreal x = this->x.valueBypassingBindings();
    qreal y = this->y.valueBypassingBindings();
    if (x || y)
        t->translate(x, y);
 
    if (!transforms.isEmpty()) {
        QMatrix4x4 m(*t);
        for (int ii = transforms.size() - 1; ii >= 0; --ii)
            transforms.at(ii)->applyTo(&m);
        *t = m.toTransform();
    }
 
    if (scale() != 1. || rotation() != 0.) {
        QPointF tp = computeTransformOrigin();
        t->translate(tp.x(), tp.y());
        t->scale(scale(), scale());
        t->rotate(rotation());
        t->translate(-tp.x(), -tp.y());
    }
}
 
QTransform QQuickItemPrivate::windowToGlobalTransform() const
{
    if (Q_UNLIKELY(window == nullptr))
        return QTransform();
 
    QPoint quickWidgetOffset;
    QWindow *renderWindow = QQuickRenderControl::renderWindowFor(window, &quickWidgetOffset);
    QPointF pos = (renderWindow ? renderWindow : window)->mapToGlobal(quickWidgetOffset);
    return QTransform::fromTranslate(pos.x(), pos.y());
}
 
QTransform QQuickItemPrivate::globalToWindowTransform() const
{
    if (Q_UNLIKELY(window == nullptr))
        return QTransform();
 
    QPoint quickWidgetOffset;
    QWindow *renderWindow = QQuickRenderControl::renderWindowFor(window, &quickWidgetOffset);
    QPointF pos = (renderWindow ? renderWindow : window)->mapToGlobal(quickWidgetOffset);
    return QTransform::fromTranslate(-pos.x(), -pos.y());
}
 
bool QQuickItem::isComponentComplete() const
{
    Q_D(const QQuickItem);
    return d->componentComplete;
}
 
QQuickItemPrivate::QQuickItemPrivate()
    : _anchors(nullptr)
    , _stateGroup(nullptr)
    , flags(0)
    , widthValidFlag(false)
    , heightValidFlag(false)
    , componentComplete(true)
    , keepMouse(false)
    , keepTouch(false)
    , hoverEnabled(false)
    , smooth(true)
    , antialiasing(false)
    , focus(false)
    , activeFocus(false)
    , notifiedFocus(false)
    , notifiedActiveFocus(false)
    , filtersChildMouseEvents(false)
    , explicitVisible(true)
    , effectiveVisible(true)
    , explicitEnable(true)
    , effectiveEnable(true)
    , polishScheduled(false)
    , inheritedLayoutMirror(false)
    , effectiveLayoutMirror(false)
    , isMirrorImplicit(true)
    , inheritMirrorFromParent(false)
    , inheritMirrorFromItem(false)
    , isAccessible(false)
    , culled(false)
    , hasCursor(false)
    , subtreeCursorEnabled(false)
    , subtreeHoverEnabled(false)
    , activeFocusOnTab(false)
    , implicitAntialiasing(false)
    , antialiasingValid(false)
    , isTabFence(false)
    , replayingPressEvent(false)
    , touchEnabled(false)
    , hasCursorHandler(false)
    , maybeHasSubsceneDeliveryAgent(true)
    , subtreeTransformChangedEnabled(true)
    , inDestructor(false)
    , focusReason(Qt::OtherFocusReason)
    , focusPolicy(Qt::NoFocus)
    , dirtyAttributes(0)
    , nextDirtyItem(nullptr)
    , prevDirtyItem(nullptr)
    , window(nullptr)
    , windowRefCount(0)
    , parentItem(nullptr)
    , sortedChildItems(&childItems)
    , subFocusItem(nullptr)
    , x(0)
    , y(0)
    , width(0)
    , height(0)
    , implicitWidth(0)
    , implicitHeight(0)
    , baselineOffset(0)
    , itemNodeInstance(nullptr)
    , paintNode(nullptr)
    , szPolicy(QLayoutPolicy::Fixed, QLayoutPolicy::Fixed)
{
}
 
QQuickItemPrivate::~QQuickItemPrivate()
{
    if (sortedChildItems != &childItems)
        delete sortedChildItems;
}
 
void QQuickItemPrivate::init(QQuickItem *parent)
{
    Q_Q(QQuickItem);
 
    isQuickItem = true;
 
    baselineOffset = 0.0;
 
    if (parent) {
        q->setParentItem(parent);
        QQuickItemPrivate *parentPrivate = QQuickItemPrivate::get(parent);
        setImplicitLayoutMirror(parentPrivate->inheritedLayoutMirror, parentPrivate->inheritMirrorFromParent);
    }
}
 
QLayoutPolicy QQuickItemPrivate::sizePolicy() const
{
    return szPolicy;
}
 
void QQuickItemPrivate::setSizePolicy(const QLayoutPolicy::Policy& horizontalPolicy, const QLayoutPolicy::Policy& verticalPolicy)
{
    szPolicy.setHorizontalPolicy(horizontalPolicy);
    szPolicy.setVerticalPolicy(verticalPolicy);
}
 
void QQuickItemPrivate::data_append(QQmlListProperty<QObject> *prop, QObject *o)
{
    if (!o)
        return;
 
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
 
    if (QQuickItem *item = qmlobject_cast<QQuickItem *>(o)) {
        item->setParentItem(that);
    } else if (QQuickPointerHandler *pointerHandler = qmlobject_cast<QQuickPointerHandler *>(o)) {
        if (pointerHandler->parent() != that) {
            qCDebug(lcHandlerParent) << "reparenting handler" << pointerHandler << ":" << pointerHandler->parent() << "->" << that;
            pointerHandler->setParent(that);
        }
        QQuickItemPrivate::get(that)->addPointerHandler(pointerHandler);
    } else {
        o->setParent(that);
        resources_append(prop, o);
    }
}
 
qsizetype QQuickItemPrivate::data_count(QQmlListProperty<QObject> *property)
{
    QQuickItem *item = static_cast<QQuickItem*>(property->object);
    QQuickItemPrivate *privateItem = QQuickItemPrivate::get(item);
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    QQmlListProperty<QQuickItem> childrenProperty = privateItem->children();
 
    return resources_count(&resourcesProperty) + children_count(&childrenProperty);
}
 
QObject *QQuickItemPrivate::data_at(QQmlListProperty<QObject> *property, qsizetype i)
{
    QQuickItem *item = static_cast<QQuickItem*>(property->object);
    QQuickItemPrivate *privateItem = QQuickItemPrivate::get(item);
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    QQmlListProperty<QQuickItem> childrenProperty = privateItem->children();
 
    qsizetype resourcesCount = resources_count(&resourcesProperty);
    if (i < resourcesCount)
        return resources_at(&resourcesProperty, i);
    const qsizetype j = i - resourcesCount;
    if (j < children_count(&childrenProperty))
        return children_at(&childrenProperty, j);
    return nullptr;
}
 
void QQuickItemPrivate::data_clear(QQmlListProperty<QObject> *property)
{
    QQuickItem *item = static_cast<QQuickItem*>(property->object);
    QQuickItemPrivate *privateItem = QQuickItemPrivate::get(item);
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    QQmlListProperty<QQuickItem> childrenProperty = privateItem->children();
 
    resources_clear(&resourcesProperty);
    children_clear(&childrenProperty);
}
 
void QQuickItemPrivate::data_removeLast(QQmlListProperty<QObject> *property)
{
    QQuickItem *item = static_cast<QQuickItem*>(property->object);
    QQuickItemPrivate *privateItem = QQuickItemPrivate::get(item);
 
    QQmlListProperty<QQuickItem> childrenProperty = privateItem->children();
    if (children_count(&childrenProperty) > 0) {
        children_removeLast(&childrenProperty);
        return;
    }
 
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    if (resources_count(&resourcesProperty) > 0)
        resources_removeLast(&resourcesProperty);
}
 
QObject *QQuickItemPrivate::resources_at(QQmlListProperty<QObject> *prop, qsizetype index)
{
    QQuickItemPrivate *quickItemPrivate = QQuickItemPrivate::get(static_cast<QQuickItem *>(prop->object));
    return quickItemPrivate->extra.isAllocated() ? quickItemPrivate->extra->resourcesList.value(index) : 0;
}
 
void QQuickItemPrivate::resources_append(QQmlListProperty<QObject> *prop, QObject *object)
{
    QQuickItem *quickItem = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *quickItemPrivate = QQuickItemPrivate::get(quickItem);
    if (!quickItemPrivate->extra.value().resourcesList.contains(object)) {
        quickItemPrivate->extra.value().resourcesList.append(object);
        qmlobject_connect(object, QObject, SIGNAL(destroyed(QObject*)),
                          quickItem, QQuickItem, SLOT(_q_resourceObjectDeleted(QObject*)));
    }
}
 
qsizetype QQuickItemPrivate::resources_count(QQmlListProperty<QObject> *prop)
{
    QQuickItemPrivate *quickItemPrivate = QQuickItemPrivate::get(static_cast<QQuickItem *>(prop->object));
    return  quickItemPrivate->extra.isAllocated() ? quickItemPrivate->extra->resourcesList.size() : 0;
}
 
void QQuickItemPrivate::resources_clear(QQmlListProperty<QObject> *prop)
{
    QQuickItem *quickItem = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *quickItemPrivate = QQuickItemPrivate::get(quickItem);
    if (quickItemPrivate->extra.isAllocated()) {//If extra is not allocated resources is empty.
        for (QObject *object : std::as_const(quickItemPrivate->extra->resourcesList)) {
            qmlobject_disconnect(object, QObject, SIGNAL(destroyed(QObject*)),
                                 quickItem, QQuickItem, SLOT(_q_resourceObjectDeleted(QObject*)));
        }
        quickItemPrivate->extra->resourcesList.clear();
    }
}
 
void QQuickItemPrivate::resources_removeLast(QQmlListProperty<QObject> *prop)
{
    QQuickItem *quickItem = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *quickItemPrivate = QQuickItemPrivate::get(quickItem);
    if (quickItemPrivate->extra.isAllocated()) {//If extra is not allocated resources is empty.
        QList<QObject *> *resources = &quickItemPrivate->extra->resourcesList;
        if (resources->isEmpty())
            return;
 
        qmlobject_disconnect(resources->last(), QObject, SIGNAL(destroyed(QObject*)),
                             quickItem, QQuickItem, SLOT(_q_resourceObjectDeleted(QObject*)));
        resources->removeLast();
    }
}
 
QQuickItem *QQuickItemPrivate::children_at(QQmlListProperty<QQuickItem> *prop, qsizetype index)
{
    QQuickItemPrivate *p = QQuickItemPrivate::get(static_cast<QQuickItem *>(prop->object));
    if (index >= p->childItems.size() || index < 0)
        return nullptr;
    else
        return p->childItems.at(index);
}
 
void QQuickItemPrivate::children_append(QQmlListProperty<QQuickItem> *prop, QQuickItem *o)
{
    if (!o)
        return;
 
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    if (o->parentItem() == that)
        o->setParentItem(nullptr);
 
    o->setParentItem(that);
}
 
qsizetype QQuickItemPrivate::children_count(QQmlListProperty<QQuickItem> *prop)
{
    QQuickItemPrivate *p = QQuickItemPrivate::get(static_cast<QQuickItem *>(prop->object));
    return p->childItems.size();
}
 
void QQuickItemPrivate::children_clear(QQmlListProperty<QQuickItem> *prop)
{
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *p = QQuickItemPrivate::get(that);
    while (!p->childItems.isEmpty())
        p->childItems.at(0)->setParentItem(nullptr);
}
 
void QQuickItemPrivate::children_removeLast(QQmlListProperty<QQuickItem> *prop)
{
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *p = QQuickItemPrivate::get(that);
    if (!p->childItems.isEmpty())
        p->childItems.last()->setParentItem(nullptr);
}
 
qsizetype QQuickItemPrivate::visibleChildren_count(QQmlListProperty<QQuickItem> *prop)
{
    QQuickItemPrivate *p = QQuickItemPrivate::get(static_cast<QQuickItem *>(prop->object));
    qsizetype visibleCount = 0;
    qsizetype c = p->childItems.size();
    while (c--) {
        if (p->childItems.at(c)->isVisible()) visibleCount++;
    }
 
    return visibleCount;
}
 
QQuickItem *QQuickItemPrivate::visibleChildren_at(QQmlListProperty<QQuickItem> *prop, qsizetype index)
{
    QQuickItemPrivate *p = QQuickItemPrivate::get(static_cast<QQuickItem *>(prop->object));
    const qsizetype childCount = p->childItems.size();
    if (index >= childCount || index < 0)
        return nullptr;
 
    qsizetype visibleCount = -1;
    for (qsizetype i = 0; i < childCount; i++) {
        if (p->childItems.at(i)->isVisible()) visibleCount++;
        if (visibleCount == index) return p->childItems.at(i);
    }
    return nullptr;
}
 
qsizetype QQuickItemPrivate::transform_count(QQmlListProperty<QQuickTransform> *prop)
{
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *p = QQuickItemPrivate::get(that);
 
    return p->transforms.size();
}
 
void QQuickTransform::appendToItem(QQuickItem *item)
{
    Q_D(QQuickTransform);
    if (!item)
        return;
 
    QQuickItemPrivate *p = QQuickItemPrivate::get(item);
 
    if (!d->items.isEmpty() && !p->transforms.isEmpty() && p->transforms.contains(this)) {
        p->transforms.removeOne(this);
        p->transforms.append(this);
    } else {
        p->transforms.append(this);
        d->items.append(item);
    }
 
    p->dirty(QQuickItemPrivate::Transform);
}
 
void QQuickTransform::prependToItem(QQuickItem *item)
{
    Q_D(QQuickTransform);
    if (!item)
        return;
 
    QQuickItemPrivate *p = QQuickItemPrivate::get(item);
 
    if (!d->items.isEmpty() && !p->transforms.isEmpty() && p->transforms.contains(this)) {
        p->transforms.removeOne(this);
        p->transforms.prepend(this);
    } else {
        p->transforms.prepend(this);
        d->items.append(item);
    }
 
    p->dirty(QQuickItemPrivate::Transform);
}
 
void QQuickItemPrivate::transform_append(QQmlListProperty<QQuickTransform> *prop, QQuickTransform *transform)
{
    if (!transform)
        return;
 
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    transform->appendToItem(that);
}
 
QQuickTransform *QQuickItemPrivate::transform_at(QQmlListProperty<QQuickTransform> *prop, qsizetype idx)
{
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *p = QQuickItemPrivate::get(that);
 
    if (idx < 0 || idx >= p->transforms.size())
        return nullptr;
    else
        return p->transforms.at(idx);
}
 
void QQuickItemPrivate::transform_clear(QQmlListProperty<QQuickTransform> *prop)
{
    QQuickItem *that = static_cast<QQuickItem *>(prop->object);
    QQuickItemPrivate *p = QQuickItemPrivate::get(that);
 
    for (qsizetype ii = 0; ii < p->transforms.size(); ++ii) {
        QQuickTransform *t = p->transforms.at(ii);
        QQuickTransformPrivate *tp = QQuickTransformPrivate::get(t);
        tp->items.removeOne(that);
    }
 
    p->transforms.clear();
 
    p->dirty(QQuickItemPrivate::Transform);
}
 
void QQuickItemPrivate::_q_resourceObjectDeleted(QObject *object)
{
    if (extra.isAllocated() && extra->resourcesList.contains(object))
        extra->resourcesList.removeAll(object);
}
 
QQuickAnchors *QQuickItemPrivate::anchors() const
{
    if (!_anchors) {
        Q_Q(const QQuickItem);
        _anchors = new QQuickAnchors(const_cast<QQuickItem *>(q));
        if (!componentComplete)
            _anchors->classBegin();
    }
    return _anchors;
}
 
void QQuickItemPrivate::siblingOrderChanged()
{
    Q_Q(QQuickItem);
    notifyChangeListeners(QQuickItemPrivate::SiblingOrder, &QQuickItemChangeListener::itemSiblingOrderChanged, q);
}
 
QQmlListProperty<QObject> QQuickItemPrivate::data()
{
    // Do not synthesize replace().
    // It would be extremely expensive and wouldn't work with most methods.
    QQmlListProperty<QObject> result;
    result.object = q_func();
    result.append = QQuickItemPrivate::data_append;
    result.count = QQuickItemPrivate::data_count;
    result.at = QQuickItemPrivate::data_at;
    result.clear = QQuickItemPrivate::data_clear;
    result.removeLast = QQuickItemPrivate::data_removeLast;
    return result;
}
 
QRectF QQuickItem::childrenRect()
{
    Q_D(QQuickItem);
    if (!d->extra.isAllocated() || !d->extra->contents) {
        d->extra.value().contents = new QQuickContents(this);
        if (d->componentComplete)
            d->extra->contents->complete();
    }
    return d->extra->contents->rectF();
}
 
QList<QQuickItem *> QQuickItem::childItems() const
{
    Q_D(const QQuickItem);
    return d->childItems;
}
 
bool QQuickItem::clip() const
{
    return flags() & ItemClipsChildrenToShape;
}
 
void QQuickItem::setClip(bool c)
{
    if (clip() == c)
        return;
 
    setFlag(ItemClipsChildrenToShape, c);
    if (c)
        setFlag(ItemIsViewport);
    else if (!(inherits("QQuickFlickable") || inherits("QQuickRootItem")))
        setFlag(ItemIsViewport, false);
 
    emit clipChanged(c);
}
 
void QQuickItem::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickItem);
 
    if (d->_anchors)
        QQuickAnchorsPrivate::get(d->_anchors)->updateMe();
 
    QQuickGeometryChange change;
    change.setXChange(newGeometry.x() != oldGeometry.x());
    change.setYChange(newGeometry.y() != oldGeometry.y());
    change.setWidthChange(newGeometry.width() != oldGeometry.width());
    change.setHeightChange(newGeometry.height() != oldGeometry.height());
 
    d->notifyChangeListeners(QQuickItemPrivate::Geometry, [&](const QQuickItemPrivate::ChangeListener &listener){
        if (change.matches(listener.gTypes))
            listener.listener->itemGeometryChanged(this, change, oldGeometry);
    });
 
    // The notify method takes care of emitting the signal, and also notifies any
    // property observers.
    if (change.xChange())
        d->x.notify();
    if (change.yChange())
        d->y.notify();
    if (change.widthChange())
        d->width.notify();
    if (change.heightChange())
        d->height.notify();
#if QT_CONFIG(accessibility)
    if (QAccessible::isActive()) {
        if (QObject *acc = QQuickAccessibleAttached::findAccessible(this)) {
            QAccessibleEvent ev(acc, QAccessible::LocationChanged);
            QAccessible::updateAccessibility(&ev);
        }
    }
#endif
}
 
QSGNode *QQuickItem::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *updatePaintNodeData)
{
    Q_UNUSED(updatePaintNodeData);
    delete oldNode;
    return nullptr;
}
 
QQuickItem::UpdatePaintNodeData::UpdatePaintNodeData()
: transformNode(nullptr)
{
}
 
void QQuickItem::releaseResources()
{
}
 
QSGTransformNode *QQuickItemPrivate::createTransformNode()
{
    return new QSGTransformNode;
}
 
void QQuickItem::updatePolish()
{
}
 
#define PRINT_LISTENERS() \
do { \
    qDebug().nospace() << q_func() << " (" << this \
        << ") now has the following listeners:"; \
    for (const auto &listener : std::as_const(changeListeners)) { \
        const auto objectPrivate = dynamic_cast<QObjectPrivate*>(listener.listener); \
        qDebug().nospace() << "- " << listener << " (QObject: " << (objectPrivate ? objectPrivate->q_func() : nullptr) << ")"; \
    } \
} \
while (false)
 
void QQuickItemPrivate::addItemChangeListener(QQuickItemChangeListener *listener, ChangeTypes types)
{
    changeListeners.append(ChangeListener(listener, types));
 
    if (lcChangeListeners().isDebugEnabled())
        PRINT_LISTENERS();
}
 
void QQuickItemPrivate::updateOrAddItemChangeListener(QQuickItemChangeListener *listener, ChangeTypes types)
{
    const ChangeListener changeListener(listener, types);
    const int index = changeListeners.indexOf(changeListener);
    if (index > -1)
        changeListeners[index].types = changeListener.types;
    else
        changeListeners.append(changeListener);
 
    if (lcChangeListeners().isDebugEnabled())
        PRINT_LISTENERS();
}
 
void QQuickItemPrivate::removeItemChangeListener(QQuickItemChangeListener *listener, ChangeTypes types)
{
    ChangeListener change(listener, types);
    changeListeners.removeOne(change);
 
    if (lcChangeListeners().isDebugEnabled())
        PRINT_LISTENERS();
}
 
void QQuickItemPrivate::updateOrAddGeometryChangeListener(QQuickItemChangeListener *listener,
                                                          QQuickGeometryChange types)
{
    ChangeListener change(listener, types);
    int index = changeListeners.indexOf(change);
    if (index > -1)
        changeListeners[index].gTypes = change.gTypes;  //we may have different GeometryChangeTypes
    else
        changeListeners.append(change);
 
    if (lcChangeListeners().isDebugEnabled())
        PRINT_LISTENERS();
}
 
void QQuickItemPrivate::updateOrRemoveGeometryChangeListener(QQuickItemChangeListener *listener,
                                                             QQuickGeometryChange types)
{
    ChangeListener change(listener, types);
    if (types.noChange()) {
        changeListeners.removeOne(change);
    } else {
        int index = changeListeners.indexOf(change);
        if (index > -1)
            changeListeners[index].gTypes = change.gTypes;  //we may have different GeometryChangeTypes
    }
 
    if (lcChangeListeners().isDebugEnabled())
        PRINT_LISTENERS();
}
 
void QQuickItem::keyPressEvent(QKeyEvent *event)
{
    event->ignore();
}
 
void QQuickItem::keyReleaseEvent(QKeyEvent *event)
{
    event->ignore();
}
 
#if QT_CONFIG(im)
void QQuickItem::inputMethodEvent(QInputMethodEvent *event)
{
    event->ignore();
}
#endif // im
 
void QQuickItem::focusInEvent(QFocusEvent *event)
{
    Q_D(QQuickItem);
#if QT_CONFIG(accessibility)
    if (QAccessible::isActive()) {
        if (QObject *acc = QQuickAccessibleAttached::findAccessible(this)) {
            QAccessibleEvent ev(acc, QAccessible::Focus);
            QAccessible::updateAccessibility(&ev);
        }
    }
#endif
    d->setLastFocusChangeReason(event->reason());
}
 
void QQuickItem::focusOutEvent(QFocusEvent *event)
{
    Q_D(QQuickItem);
    d->setLastFocusChangeReason(event->reason());
}
 
void QQuickItem::mousePressEvent(QMouseEvent *event)
{
    event->ignore();
}
 
void QQuickItem::mouseMoveEvent(QMouseEvent *event)
{
    event->ignore();
}
 
void QQuickItem::mouseReleaseEvent(QMouseEvent *event)
{
    event->ignore();
}
 
void QQuickItem::mouseDoubleClickEvent(QMouseEvent *event)
{
    event->ignore();
}
 
void QQuickItem::mouseUngrabEvent()
{
    // XXX todo
}
 
void QQuickItem::touchUngrabEvent()
{
    // XXX todo
}
 
#if QT_CONFIG(wheelevent)
void QQuickItem::wheelEvent(QWheelEvent *event)
{
    event->ignore();
}
#endif
 
void QQuickItem::touchEvent(QTouchEvent *event)
{
    event->ignore();
}
 
void QQuickItem::hoverEnterEvent(QHoverEvent *event)
{
    event->ignore();
}
 
void QQuickItem::hoverMoveEvent(QHoverEvent *event)
{
    event->ignore();
}
 
void QQuickItem::hoverLeaveEvent(QHoverEvent *event)
{
    event->ignore();
}
 
#if QT_CONFIG(quick_draganddrop)
void QQuickItem::dragEnterEvent(QDragEnterEvent *event)
{
    Q_UNUSED(event);
}
 
void QQuickItem::dragMoveEvent(QDragMoveEvent *event)
{
    Q_UNUSED(event);
}
 
void QQuickItem::dragLeaveEvent(QDragLeaveEvent *event)
{
    Q_UNUSED(event);
}
 
void QQuickItem::dropEvent(QDropEvent *event)
{
    Q_UNUSED(event);
}
#endif // quick_draganddrop
 
bool QQuickItem::childMouseEventFilter(QQuickItem *item, QEvent *event)
{
    Q_UNUSED(item);
    Q_UNUSED(event);
    return false;
}
 
#if QT_CONFIG(im)
QVariant QQuickItem::inputMethodQuery(Qt::InputMethodQuery query) const
{
    Q_D(const QQuickItem);
    QVariant v;
 
    switch (query) {
    case Qt::ImEnabled:
        v = (bool)(flags() & ItemAcceptsInputMethod);
        break;
    case Qt::ImHints:
    case Qt::ImAnchorRectangle:
    case Qt::ImCursorRectangle:
    case Qt::ImFont:
    case Qt::ImCursorPosition:
    case Qt::ImSurroundingText:
    case Qt::ImCurrentSelection:
    case Qt::ImMaximumTextLength:
    case Qt::ImAnchorPosition:
    case Qt::ImPreferredLanguage:
    case Qt::ImReadOnly:
        if (d->extra.isAllocated() && d->extra->keyHandler)
            v = d->extra->keyHandler->inputMethodQuery(query);
        break;
    case Qt::ImEnterKeyType:
        if (d->extra.isAllocated() && d->extra->enterKeyAttached)
            v = d->extra->enterKeyAttached->type();
        break;
    case Qt::ImInputItemClipRectangle:
        if (!(!window() ||!isVisible() || qFuzzyIsNull(opacity()))) {
            QRectF rect = QRectF(0,0, width(), height());
            const QQuickItem *par = this;
            while (QQuickItem *parpar = par->parentItem()) {
                rect = parpar->mapRectFromItem(par, rect);
                if (parpar->clip())
                    rect = rect.intersected(parpar->clipRect());
                par = parpar;
            }
            rect = par->mapRectToScene(rect);
            // once we have the rect in scene coordinates, clip to window
            rect = rect.intersected(QRectF(QPoint(0,0), window()->size()));
            // map it back to local coordinates
            v = mapRectFromScene(rect);
        }
        break;
    default:
        break;
    }
 
    return v;
}
#endif // im
 
QQuickAnchorLine QQuickItemPrivate::left() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::LeftAnchor);
}
 
QQuickAnchorLine QQuickItemPrivate::right() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::RightAnchor);
}
 
QQuickAnchorLine QQuickItemPrivate::horizontalCenter() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::HCenterAnchor);
}
 
QQuickAnchorLine QQuickItemPrivate::top() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::TopAnchor);
}
 
QQuickAnchorLine QQuickItemPrivate::bottom() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::BottomAnchor);
}
 
QQuickAnchorLine QQuickItemPrivate::verticalCenter() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::VCenterAnchor);
}
 
QQuickAnchorLine QQuickItemPrivate::baseline() const
{
    Q_Q(const QQuickItem);
    return QQuickAnchorLine(const_cast<QQuickItem *>(q), QQuickAnchors::BaselineAnchor);
}
 
qreal QQuickItem::baselineOffset() const
{
    Q_D(const QQuickItem);
    return d->baselineOffset;
}
 
void QQuickItem::setBaselineOffset(qreal offset)
{
    Q_D(QQuickItem);
    if (offset == d->baselineOffset)
        return;
 
    d->baselineOffset = offset;
 
    d->notifyChangeListeners(QQuickItemPrivate::Geometry, [](const QQuickItemPrivate::ChangeListener &change){
        QQuickAnchorsPrivate *anchor = change.listener->anchorPrivate();
        if (anchor)
            anchor->updateVerticalAnchors();
    });
 
    if (d->_anchors && (d->_anchors->usedAnchors() & QQuickAnchors::BaselineAnchor))
        QQuickAnchorsPrivate::get(d->_anchors)->updateVerticalAnchors();
 
    emit baselineOffsetChanged(offset);
}
 
 
void QQuickItem::update()
{
    Q_D(QQuickItem);
    if (!(flags() & ItemHasContents)) {
#ifndef QT_NO_DEBUG
        qWarning() << metaObject()->className() << ": Update called for a item without content";
#endif
        return;
    }
    d->dirty(QQuickItemPrivate::Content);
}
 
void QQuickItem::polish()
{
    Q_D(QQuickItem);
    if (!d->polishScheduled) {
        d->polishScheduled = true;
        if (d->window) {
            QQuickWindowPrivate *p = QQuickWindowPrivate::get(d->window);
            bool maybeupdate = p->itemsToPolish.isEmpty();
            p->itemsToPolish.append(this);
            if (maybeupdate) d->window->maybeUpdate();
        }
    }
}
 
void QQuickItem::ensurePolished()
{
    updatePolish();
}
 
#if QT_DEPRECATED_SINCE(6, 5)
static bool unwrapMapFromToFromItemArgs(QQmlV4FunctionPtr args, const QQuickItem *itemForWarning, const QString &functionNameForWarning,
                                        QQuickItem **itemObj, qreal *x, qreal *y, qreal *w, qreal *h, bool *isRect)
{
    QV4::ExecutionEngine *v4 = args->v4engine();
    if (args->length() != 2 && args->length() != 3 && args->length() != 5) {
        v4->throwTypeError();
        return false;
    }
 
    QV4::Scope scope(v4);
    QV4::ScopedValue item(scope, (*args)[0]);
 
    *itemObj = nullptr;
    if (!item->isNull()) {
        QV4::Scoped<QV4::QObjectWrapper> qobjectWrapper(scope, item->as<QV4::QObjectWrapper>());
        if (qobjectWrapper)
            *itemObj = qobject_cast<QQuickItem*>(qobjectWrapper->object());
    }
 
    if (!(*itemObj) && !item->isNull()) {
        qmlWarning(itemForWarning) << functionNameForWarning << " given argument \"" << item->toQStringNoThrow()
                                   << "\" which is neither null nor an Item";
        v4->throwTypeError();
        return false;
    }
 
    *isRect = false;
 
    if (args->length() == 2) {
        QV4::ScopedValue sv(scope, (*args)[1]);
        if (sv->isNull()) {
            qmlWarning(itemForWarning) << functionNameForWarning << "given argument \"" << sv->toQStringNoThrow()
                                       << "\" which is neither a point nor a rect";
            v4->throwTypeError();
            return false;
        }
        const QV4::Scoped<QV4::QQmlValueTypeWrapper> variantWrapper(scope, sv->as<QV4::QQmlValueTypeWrapper>());
        const QVariant v = variantWrapper ? variantWrapper->toVariant() : QVariant();
        if (v.canConvert<QPointF>()) {
            const QPointF p = v.toPointF();
            *x = p.x();
            *y = p.y();
        } else if (v.canConvert<QRectF>()) {
            const QRectF r = v.toRectF();
            *x = r.x();
            *y = r.y();
            *w = r.width();
            *h = r.height();
            *isRect = true;
        } else {
            qmlWarning(itemForWarning) << functionNameForWarning << "given argument \"" << sv->toQStringNoThrow()
                                       << "\" which is neither a point nor a rect";
            v4->throwTypeError();
            return false;
        }
    } else {
        QV4::ScopedValue vx(scope, (*args)[1]);
        QV4::ScopedValue vy(scope, (*args)[2]);
 
        if (!vx->isNumber() || !vy->isNumber()) {
            v4->throwTypeError();
            return false;
        }
 
        *x = vx->asDouble();
        *y = vy->asDouble();
 
        if (args->length() > 3) {
            QV4::ScopedValue vw(scope, (*args)[3]);
            QV4::ScopedValue vh(scope, (*args)[4]);
            if (!vw->isNumber() || !vh->isNumber()) {
                v4->throwTypeError();
                return false;
            }
            *w = vw->asDouble();
            *h = vh->asDouble();
            *isRect = true;
        }
    }
 
    return true;
}
#endif
 
#if QT_DEPRECATED_SINCE(6, 5)
void QQuickItem::mapFromItem(QQmlV4FunctionPtr args) const
{
    QV4::ExecutionEngine *v4 = args->v4engine();
    QV4::Scope scope(v4);
 
    qreal x, y, w, h;
    bool isRect;
    QQuickItem *itemObj;
    if (!unwrapMapFromToFromItemArgs(args, this, QStringLiteral("mapFromItem()"), &itemObj, &x, &y, &w, &h, &isRect))
        return;
 
    const QVariant result = isRect ? QVariant(mapRectFromItem(itemObj, QRectF(x, y, w, h)))
                                   : QVariant(mapFromItem(itemObj, QPointF(x, y)));
 
    QV4::ScopedObject rv(scope, v4->fromVariant(result));
    args->setReturnValue(rv.asReturnedValue());
}
#endif
 
QTransform QQuickItem::itemTransform(QQuickItem *other, bool *ok) const
{
    Q_D(const QQuickItem);
 
    // XXX todo - we need to be able to handle common parents better and detect
    // invalid cases
    if (ok) *ok = true;
 
    QTransform t = d->itemToWindowTransform();
    if (other) t *= QQuickItemPrivate::get(other)->windowToItemTransform();
 
    return t;
}
 
#if QT_DEPRECATED_SINCE(6, 5)
void QQuickItem::mapToItem(QQmlV4FunctionPtr args) const
{
    QV4::ExecutionEngine *v4 = args->v4engine();
    QV4::Scope scope(v4);
 
    qreal x, y, w, h;
    bool isRect;
    QQuickItem *itemObj;
    if (!unwrapMapFromToFromItemArgs(args, this, QStringLiteral("mapToItem()"), &itemObj, &x, &y, &w, &h, &isRect))
        return;
 
    const QVariant result = isRect ? QVariant(mapRectToItem(itemObj, QRectF(x, y, w, h)))
                                   : QVariant(mapToItem(itemObj, QPointF(x, y)));
 
    QV4::ScopedObject rv(scope, v4->fromVariant(result));
    args->setReturnValue(rv.asReturnedValue());
}
 
static bool unwrapMapFromToFromGlobalArgs(QQmlV4FunctionPtr args, const QQuickItem *itemForWarning, const QString &functionNameForWarning, qreal *x, qreal *y)
{
    QV4::ExecutionEngine *v4 = args->v4engine();
    if (args->length() != 1 && args->length() != 2) {
        v4->throwTypeError();
        return false;
    }
 
    QV4::Scope scope(v4);
 
    if (args->length() == 1) {
        QV4::ScopedValue sv(scope, (*args)[0]);
        if (sv->isNull()) {
            qmlWarning(itemForWarning) << functionNameForWarning << "given argument \"" << sv->toQStringNoThrow()
                                       << "\" which is not a point";
            v4->throwTypeError();
            return false;
        }
        const QV4::Scoped<QV4::QQmlValueTypeWrapper> variantWrapper(scope, sv->as<QV4::QQmlValueTypeWrapper>());
        const QVariant v = variantWrapper ? variantWrapper->toVariant() : QVariant();
        if (v.canConvert<QPointF>()) {
            const QPointF p = v.toPointF();
            *x = p.x();
            *y = p.y();
        } else {
            qmlWarning(itemForWarning) << functionNameForWarning << "given argument \"" << sv->toQStringNoThrow()
                                       << "\" which is not a point";
            v4->throwTypeError();
            return false;
        }
    } else {
        QV4::ScopedValue vx(scope, (*args)[0]);
        QV4::ScopedValue vy(scope, (*args)[1]);
 
        if (!vx->isNumber() || !vy->isNumber()) {
            v4->throwTypeError();
            return false;
        }
 
        *x = vx->asDouble();
        *y = vy->asDouble();
    }
 
    return true;
}
 
void QQuickItem::mapFromGlobal(QQmlV4FunctionPtr args) const
{
    QV4::ExecutionEngine *v4 = args->v4engine();
    QV4::Scope scope(v4);
 
    qreal x, y;
    if (!unwrapMapFromToFromGlobalArgs(args, this, QStringLiteral("mapFromGlobal()"), &x, &y))
        return;
 
    QVariant result = mapFromGlobal(QPointF(x, y));
 
    QV4::ScopedObject rv(scope, v4->fromVariant(result));
    args->setReturnValue(rv.asReturnedValue());
}
#endif
 
#if QT_DEPRECATED_SINCE(6, 5)
void QQuickItem::mapToGlobal(QQmlV4FunctionPtr args) const
{
    QV4::ExecutionEngine *v4 = args->v4engine();
    QV4::Scope scope(v4);
 
    qreal x, y;
    if (!unwrapMapFromToFromGlobalArgs(args, this, QStringLiteral("mapFromGlobal()"), &x, &y))
        return;
 
    QVariant result = mapToGlobal(QPointF(x, y));
 
    QV4::ScopedObject rv(scope, v4->fromVariant(result));
    args->setReturnValue(rv.asReturnedValue());
}
#endif
 
void QQuickItem::forceActiveFocus()
{
    forceActiveFocus(Qt::OtherFocusReason);
}
 
void QQuickItem::forceActiveFocus(Qt::FocusReason reason)
{
    setFocus(true, reason);
    QQuickItem *parent = parentItem();
    QQuickItem *scope = nullptr;
    while (parent) {
        if (parent->flags() & QQuickItem::ItemIsFocusScope) {
            parent->setFocus(true, reason);
            if (!scope)
                scope = parent;
        }
        parent = parent->parentItem();
    }
}
 
QQuickItem *QQuickItem::nextItemInFocusChain(bool forward)
{
    return QQuickItemPrivate::nextPrevItemInTabFocusChain(this, forward);
}
 
QQuickItem *QQuickItem::childAt(qreal x, qreal y) const
{
    const QList<QQuickItem *> children = childItems();
    for (int i = children.size()-1; i >= 0; --i) {
        QQuickItem *child = children.at(i);
        // Map coordinates to the child element's coordinate space
        QPointF point = mapToItem(child, QPointF(x, y));
        if (child->isVisible() && child->contains(point))
            return child;
    }
    return nullptr;
}
 
void QQuickItem::dumpItemTree() const
{
    Q_D(const QQuickItem);
    d->dumpItemTree(0);
}
 
void QQuickItemPrivate::dumpItemTree(int indent) const
{
    Q_Q(const QQuickItem);
 
    const auto indentStr = QString(indent * 4, QLatin1Char(' '));
    qDebug().nospace().noquote() << indentStr <<
#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0)
                                    const_cast<QQuickItem *>(q);
#else
                                    q;
#endif
    if (extra.isAllocated()) {
        for (const auto handler : extra->pointerHandlers)
            qDebug().nospace().noquote() << indentStr << u"  \u26ee " << handler;
    }
    for (const QQuickItem *ch : childItems) {
        auto itemPriv = QQuickItemPrivate::get(ch);
        itemPriv->dumpItemTree(indent + 1);
    }
}
 
QQmlListProperty<QObject> QQuickItemPrivate::resources()
{
    // Do not synthesize replace().
    // It would be extremely expensive and wouldn't work with most methods.
    QQmlListProperty<QObject> result;
    result.object = q_func();
    result.append = QQuickItemPrivate::resources_append;
    result.count = QQuickItemPrivate::resources_count;
    result.at = QQuickItemPrivate::resources_at;
    result.clear = QQuickItemPrivate::resources_clear;
    result.removeLast = QQuickItemPrivate::resources_removeLast;
    return result;
}
 
QQmlListProperty<QQuickItem> QQuickItemPrivate::children()
{
    // Do not synthesize replace().
    // It would be extremely expensive and wouldn't work with most methods.
    QQmlListProperty<QQuickItem> result;
    result.object = q_func();
    result.append = QQuickItemPrivate::children_append;
    result.count = QQuickItemPrivate::children_count;
    result.at = QQuickItemPrivate::children_at;
    result.clear = QQuickItemPrivate::children_clear;
    result.removeLast = QQuickItemPrivate::children_removeLast;
    return result;
}
 
QQmlListProperty<QQuickItem> QQuickItemPrivate::visibleChildren()
{
    return QQmlListProperty<QQuickItem>(q_func(),
                                        nullptr,
                                        QQuickItemPrivate::visibleChildren_count,
                                        QQuickItemPrivate::visibleChildren_at);
 
}
 
QQmlListProperty<QQuickState> QQuickItemPrivate::states()
{
    return _states()->statesProperty();
}
 
QQmlListProperty<QQuickTransition> QQuickItemPrivate::transitions()
{
    return _states()->transitionsProperty();
}
 
QString QQuickItemPrivate::state() const
{
    if (!_stateGroup)
        return QString();
    else
        return _stateGroup->state();
}
 
void QQuickItemPrivate::setState(const QString &state)
{
    _states()->setState(state);
}
 
QString QQuickItem::state() const
{
    Q_D(const QQuickItem);
    return d->state();
}
 
void QQuickItem::setState(const QString &state)
{
    Q_D(QQuickItem);
    d->setState(state);
}
 
QQmlListProperty<QQuickTransform> QQuickItem::transform()
{
    return QQmlListProperty<QQuickTransform>(this, nullptr, QQuickItemPrivate::transform_append,
                                                     QQuickItemPrivate::transform_count,
                                                     QQuickItemPrivate::transform_at,
                                                     QQuickItemPrivate::transform_clear);
}
 
void QQuickItem::classBegin()
{
    Q_D(QQuickItem);
    d->componentComplete = false;
    if (d->_stateGroup)
        d->_stateGroup->classBegin();
    if (d->_anchors)
        d->_anchors->classBegin();
#if QT_CONFIG(quick_shadereffect)
    if (d->extra.isAllocated() && d->extra->layer)
        d->extra->layer->classBegin();
#endif
}
 
void QQuickItem::componentComplete()
{
    Q_D(QQuickItem);
    d->componentComplete = true;
    if (d->_stateGroup)
        d->_stateGroup->componentComplete();
    if (d->_anchors) {
        d->_anchors->componentComplete();
        QQuickAnchorsPrivate::get(d->_anchors)->updateOnComplete();
    }
 
    if (d->extra.isAllocated()) {
#if QT_CONFIG(quick_shadereffect)
        if (d->extra->layer)
            d->extra->layer->componentComplete();
#endif
 
        if (d->extra->keyHandler)
            d->extra->keyHandler->componentComplete();
 
        if (d->extra->contents)
            d->extra->contents->complete();
    }
 
    if (d->window && d->dirtyAttributes) {
        d->addToDirtyList();
        QQuickWindowPrivate::get(d->window)->dirtyItem(this);
    }
 
#if QT_CONFIG(accessibility)
    if (d->isAccessible && d->effectiveVisible) {
        QAccessibleEvent ev(this, QAccessible::ObjectShow);
        QAccessible::updateAccessibility(&ev);
    }
#endif
}
 
QQuickStateGroup *QQuickItemPrivate::_states()
{
    Q_Q(QQuickItem);
    if (!_stateGroup) {
        _stateGroup = new QQuickStateGroup;
        if (!componentComplete)
            _stateGroup->classBegin();
        qmlobject_connect(_stateGroup, QQuickStateGroup, SIGNAL(stateChanged(QString)),
                          q, QQuickItem, SIGNAL(stateChanged(QString)));
    }
 
    return _stateGroup;
}
 
QPointF QQuickItemPrivate::computeTransformOrigin() const
{
    switch (origin()) {
    default:
    case QQuickItem::TopLeft:
        return QPointF(0, 0);
    case QQuickItem::Top:
        return QPointF(width / 2., 0);
    case QQuickItem::TopRight:
        return QPointF(width, 0);
    case QQuickItem::Left:
        return QPointF(0, height / 2.);
    case QQuickItem::Center:
        return QPointF(width / 2., height / 2.);
    case QQuickItem::Right:
        return QPointF(width, height / 2.);
    case QQuickItem::BottomLeft:
        return QPointF(0, height);
    case QQuickItem::Bottom:
        return QPointF(width / 2., height);
    case QQuickItem::BottomRight:
        return QPointF(width, height);
    }
}
 
bool QQuickItemPrivate::transformChanged(QQuickItem *transformedItem)
{
    Q_Q(QQuickItem);
 
    bool childWantsIt = false;
    if (subtreeTransformChangedEnabled) {
        // Inform the children in paint order: by the time we visit leaf items,
        // they can see any consequences in their parents
        const auto children = paintOrderChildItems();
        for (QQuickItem *child : children)
            childWantsIt |= QQuickItemPrivate::get(child)->transformChanged(transformedItem);
    }
 
#if QT_CONFIG(quick_shadereffect)
    if (q == transformedItem) {
        if (extra.isAllocated() && extra->layer)
            extra->layer->updateMatrix();
    }
#endif
    const bool thisWantsIt = q->flags().testFlag(QQuickItem::ItemObservesViewport);
    const bool ret = childWantsIt || thisWantsIt;
    if (!ret && componentComplete && subtreeTransformChangedEnabled) {
        qCDebug(lcVP) << "turned off subtree transformChanged notification after checking all children of" << q;
        subtreeTransformChangedEnabled = false;
    }
    // If ItemObservesViewport, clipRect() calculates the intersection with the viewport;
    // so each time the item moves in the viewport, its clipnode needs to be updated.
    if (thisWantsIt && q->clip() && !(dirtyAttributes & QQuickItemPrivate::Clip))
        dirty(QQuickItemPrivate::Clip);
    return ret;
}
 
QPointF QQuickItemPrivate::adjustedPosForTransform(const QPointF &centroidParentPos,
                                                   const QPointF &startPos,
                                                   const QVector2D &activeTranslation,
                                                   qreal startScale,
                                                   qreal activeScale,
                                                   qreal startRotation,
                                                   qreal activeRotation)
{
    Q_Q(QQuickItem);
    QVector3D xformOrigin(q->transformOriginPoint());
    QMatrix4x4 startMatrix;
    startMatrix.translate(float(startPos.x()), float(startPos.y()));
    startMatrix.translate(xformOrigin);
    startMatrix.scale(float(startScale));
    startMatrix.rotate(float(startRotation), 0, 0, -1);
    startMatrix.translate(-xformOrigin);
 
    const QVector3D centroidParentVector(centroidParentPos);
    QMatrix4x4 mat;
    mat.translate(centroidParentVector);
    mat.rotate(float(activeRotation), 0, 0, 1);
    mat.scale(float(activeScale));
    mat.translate(-centroidParentVector);
    mat.translate(QVector3D(activeTranslation));
 
    mat = mat * startMatrix;
 
    QPointF xformOriginPoint = q->transformOriginPoint();
    QPointF pos = mat.map(xformOriginPoint);
    pos -= xformOriginPoint;
 
    return pos;
}
 
QQuickDeliveryAgent *QQuickItemPrivate::deliveryAgent()
{
    Q_Q(QQuickItem);
    if (maybeHasSubsceneDeliveryAgent) {
        QQuickItemPrivate *p = this;
        do {
            if (qmlobject_cast<QQuickRootItem *>(p->q_ptr)) {
                // found the root item without finding a different DA:
                // it means we don't need to repeat this search next time.
                // TODO maybe optimize further: make this function recursive, and
                // set it to false on each item that we visit in the tail
                maybeHasSubsceneDeliveryAgent = false;
                break;
            }
            if (p->extra.isAllocated()) {
                if (auto da = p->extra->subsceneDeliveryAgent)
                    return da;
            }
            p = p->parentItem ? QQuickItemPrivate::get(p->parentItem) : nullptr;
        } while (p);
        // arriving here is somewhat unexpected: a detached root can easily be created (just set an item's parent to null),
        // but why would we deliver events to that subtree? only if root got detached while an item in that subtree still has a grab?
        qCDebug(lcPtr) << "detached root of" << q << "is not a QQuickRootItem and also does not have its own DeliveryAgent";
    }
    if (window)
        return QQuickWindowPrivate::get(window)->deliveryAgent;
    return nullptr;
}
 
QQuickDeliveryAgentPrivate *QQuickItemPrivate::deliveryAgentPrivate()
{
    auto da = deliveryAgent();
    return da ? static_cast<QQuickDeliveryAgentPrivate *>(QQuickDeliveryAgentPrivate::get(da)) : nullptr;
}
 
QQuickDeliveryAgent *QQuickItemPrivate::ensureSubsceneDeliveryAgent()
{
    Q_Q(QQuickItem);
    // We are (about to be) sure that it has one now; but just to save space,
    // we avoid storing a DA pointer in each item; so deliveryAgent() always needs to
    // go up the hierarchy to find it. maybeHasSubsceneDeliveryAgent tells it to do that.
    maybeHasSubsceneDeliveryAgent = true;
    if (extra.isAllocated() && extra->subsceneDeliveryAgent)
        return extra->subsceneDeliveryAgent;
    extra.value().subsceneDeliveryAgent = new QQuickDeliveryAgent(q);
    qCDebug(lcPtr) << "created new" << extra->subsceneDeliveryAgent;
    // every subscene root needs to be a focus scope so that when QQuickItem::forceActiveFocus()
    // goes up the parent hierarchy, it finds the subscene root and calls setFocus() on it
    q->setFlag(QQuickItem::ItemIsFocusScope);
    return extra->subsceneDeliveryAgent;
}
 
bool QQuickItemPrivate::filterKeyEvent(QKeyEvent *e, bool post)
{
    if (!extra.isAllocated() || !extra->keyHandler)
        return false;
 
    if (post)
        e->accept();
 
    if (e->type() == QEvent::KeyPress)
        extra->keyHandler->keyPressed(e, post);
    else
        extra->keyHandler->keyReleased(e, post);
 
    return e->isAccepted();
}
 
void QQuickItemPrivate::deliverPointerEvent(QEvent *event)
{
    Q_Q(QQuickItem);
    const auto eventType = event->type();
    const bool focusAccepted = setFocusIfNeeded(eventType);
 
    switch (eventType) {
    case QEvent::MouseButtonPress:
        q->mousePressEvent(static_cast<QMouseEvent *>(event));
        break;
    case QEvent::MouseButtonRelease:
        q->mouseReleaseEvent(static_cast<QMouseEvent *>(event));
        break;
    case QEvent::MouseButtonDblClick:
        q->mouseDoubleClickEvent(static_cast<QMouseEvent *>(event));
        break;
#if QT_CONFIG(wheelevent)
    case QEvent::Wheel:
        q->wheelEvent(static_cast<QWheelEvent*>(event));
        break;
#endif
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
    case QEvent::TouchCancel:
        q->touchEvent(static_cast<QTouchEvent *>(event));
        break;
    default:
        break;
    }
 
    if (focusAccepted)
        event->accept();
}
 
void QQuickItemPrivate::deliverKeyEvent(QKeyEvent *e)
{
    Q_Q(QQuickItem);
 
    Q_ASSERT(e->isAccepted());
    if (filterKeyEvent(e, false))
        return;
    else
        e->accept();
 
    if (e->type() == QEvent::KeyPress)
        q->keyPressEvent(e);
    else
        q->keyReleaseEvent(e);
 
    if (e->isAccepted())
        return;
 
    if (filterKeyEvent(e, true) || !q->window())
        return;
 
    //only care about KeyPress now
    if (e->type() == QEvent::KeyPress &&
            (q == q->window()->contentItem() || q->activeFocusOnTab())) {
        bool res = false;
        if (!(e->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
            if (e->key() == Qt::Key_Backtab
                || (e->key() == Qt::Key_Tab && (e->modifiers() & Qt::ShiftModifier)))
                res = QQuickItemPrivate::focusNextPrev(q, false);
            else if (e->key() == Qt::Key_Tab)
                res = QQuickItemPrivate::focusNextPrev(q, true);
            if (res)
                e->setAccepted(true);
        }
    }
}
 
#if QT_CONFIG(im)
void QQuickItemPrivate::deliverInputMethodEvent(QInputMethodEvent *e)
{
    Q_Q(QQuickItem);
 
    Q_ASSERT(e->isAccepted());
    if (extra.isAllocated() && extra->keyHandler) {
        extra->keyHandler->inputMethodEvent(e, false);
 
        if (e->isAccepted())
            return;
        else
            e->accept();
    }
 
    q->inputMethodEvent(e);
 
    if (e->isAccepted())
        return;
 
    if (extra.isAllocated() && extra->keyHandler) {
        e->accept();
 
        extra->keyHandler->inputMethodEvent(e, true);
    }
}
#endif // im
 
void QQuickItemPrivate::deliverShortcutOverrideEvent(QKeyEvent *event)
{
    if (extra.isAllocated() && extra->keyHandler)
        extra->keyHandler->shortcutOverrideEvent(event);
    else
        event->ignore();
}
 
bool QQuickItemPrivate::anyPointerHandlerWants(const QPointerEvent *event, const QEventPoint &point) const
{
    if (!hasPointerHandlers())
        return false;
    for (QQuickPointerHandler *handler : extra->pointerHandlers) {
        if (handler->wantsEventPoint(event, point))
            return true;
    }
    return false;
}
 
bool QQuickItemPrivate::handlePointerEvent(QPointerEvent *event, bool avoidGrabbers)
{
    bool delivered = false;
    if (extra.isAllocated()) {
        for (QQuickPointerHandler *handler : extra->pointerHandlers) {
            bool avoidThisHandler = false;
            if (QQuickDeliveryAgentPrivate::isMouseOrWheelEvent(event) &&
                    qmlobject_cast<const QQuickHoverHandler *>(handler)) {
                avoidThisHandler = true;
            } else if (avoidGrabbers) {
                for (auto &p : event->points()) {
                    if (event->exclusiveGrabber(p) == handler || event->passiveGrabbers(p).contains(handler)) {
                        avoidThisHandler = true;
                        break;
                    }
                }
            }
            if (!avoidThisHandler &&
                    !QQuickPointerHandlerPrivate::deviceDeliveryTargets(event->device()).contains(handler)) {
                handler->handlePointerEvent(event);
                delivered = true;
            }
        }
    }
    return delivered;
}
 
void QQuickItem::itemChange(ItemChange change, const ItemChangeData &value)
{
    if (change == ItemSceneChange)
        emit windowChanged(value.window);
}
 
#if QT_CONFIG(im)
void QQuickItem::updateInputMethod(Qt::InputMethodQueries queries)
{
    if (hasActiveFocus())
        QGuiApplication::inputMethod()->update(queries);
}
#endif // im
 
QRectF QQuickItem::boundingRect() const
{
    Q_D(const QQuickItem);
    return QRectF(0, 0, d->width, d->height);
}
 
QRectF QQuickItem::clipRect() const
{
    Q_D(const QQuickItem);
    QRectF ret(0, 0, d->width, d->height);
    if (flags().testFlag(QQuickItem::ItemObservesViewport)) {
        if (QQuickItem *viewport = viewportItem()) {
            // if the viewport is already "this", there's nothing to intersect;
            // and don't call clipRect() again, to avoid infinite recursion
            if (viewport == this)
                return ret;
            const auto mappedViewportRect = mapRectFromItem(viewport, viewport->clipRect());
            qCDebug(lcVP) << this << "intersecting" << viewport << mappedViewportRect << ret << "->" << mappedViewportRect.intersected(ret);
            return mappedViewportRect.intersected(ret);
        }
    }
    return ret;
}
 
QQuickItem *QQuickItem::viewportItem() const
{
    if (flags().testFlag(ItemObservesViewport)) {
        QQuickItem *par = parentItem();
        while (par) {
            if (par->flags().testFlag(QQuickItem::ItemIsViewport))
                return par;
            par = par->parentItem();
        }
    }
    return (window() ? window()->contentItem() : nullptr);
}
 
QQuickItem::TransformOrigin QQuickItem::transformOrigin() const
{
    Q_D(const QQuickItem);
    return d->origin();
}
 
void QQuickItem::setTransformOrigin(TransformOrigin origin)
{
    Q_D(QQuickItem);
    if (origin == d->origin())
        return;
 
    d->extra.value().origin = origin;
    d->dirty(QQuickItemPrivate::TransformOrigin);
 
    emit transformOriginChanged(d->origin());
}
 
QPointF QQuickItem::transformOriginPoint() const
{
    Q_D(const QQuickItem);
    if (d->extra.isAllocated() && !d->extra->userTransformOriginPoint.isNull())
        return d->extra->userTransformOriginPoint;
    return d->computeTransformOrigin();
}
 
void QQuickItem::setTransformOriginPoint(const QPointF &point)
{
    Q_D(QQuickItem);
    if (d->extra.value().userTransformOriginPoint == point)
        return;
 
    d->extra->userTransformOriginPoint = point;
    d->dirty(QQuickItemPrivate::TransformOrigin);
}
 
qreal QQuickItem::z() const
{
    Q_D(const QQuickItem);
    return d->z();
}
 
void QQuickItem::setZ(qreal v)
{
    Q_D(QQuickItem);
    if (d->z() == v)
        return;
 
    d->extra.value().z = v;
 
    d->dirty(QQuickItemPrivate::ZValue);
    if (d->parentItem) {
        QQuickItemPrivate::get(d->parentItem)->markSortedChildrenDirty(this);
        QQuickItemPrivate::get(d->parentItem)->dirty(QQuickItemPrivate::ChildrenStackingChanged);
    }
 
    emit zChanged();
 
#if QT_CONFIG(quick_shadereffect)
    if (d->extra.isAllocated() && d->extra->layer)
        d->extra->layer->updateZ();
#endif
}
 
qreal QQuickItem::rotation() const
{
    Q_D(const QQuickItem);
    return d->rotation();
}
 
void QQuickItem::setRotation(qreal r)
{
    Q_D(QQuickItem);
    if (d->rotation() == r)
        return;
 
    d->extra.value().rotation = r;
 
    d->dirty(QQuickItemPrivate::BasicTransform);
 
    d->itemChange(ItemRotationHasChanged, r);
 
    emit rotationChanged();
}
 
qreal QQuickItem::scale() const
{
    Q_D(const QQuickItem);
    return d->scale();
}
 
void QQuickItem::setScale(qreal s)
{
    Q_D(QQuickItem);
    if (d->scale() == s)
        return;
 
    d->extra.value().scale = s;
 
    d->dirty(QQuickItemPrivate::BasicTransform);
 
    emit scaleChanged();
}
 
qreal QQuickItem::opacity() const
{
    Q_D(const QQuickItem);
    return d->opacity();
}
 
void QQuickItem::setOpacity(qreal newOpacity)
{
    Q_D(QQuickItem);
    qreal o = qBound<qreal>(0, newOpacity, 1);
    if (d->opacity() == o)
        return;
 
    d->extra.value().opacity = o;
 
    d->dirty(QQuickItemPrivate::OpacityValue);
 
    d->itemChange(ItemOpacityHasChanged, o);
 
    emit opacityChanged();
}
 
bool QQuickItem::isVisible() const
{
    Q_D(const QQuickItem);
    return d->effectiveVisible;
}
 
void QQuickItemPrivate::setVisible(bool visible)
{
    if (visible == explicitVisible)
        return;
 
    explicitVisible = visible;
    if (!visible)
        dirty(QQuickItemPrivate::Visible);
 
    const bool childVisibilityChanged = setEffectiveVisibleRecur(calcEffectiveVisible());
    if (childVisibilityChanged && parentItem)
        emit parentItem->visibleChildrenChanged();   // signal the parent, not this!
}
 
void QQuickItem::setVisible(bool v)
{
    Q_D(QQuickItem);
    d->setVisible(v);
}
 
bool QQuickItem::isEnabled() const
{
    Q_D(const QQuickItem);
    return d->effectiveEnable;
}
 
void QQuickItem::setEnabled(bool e)
{
    Q_D(QQuickItem);
    if (e == d->explicitEnable)
        return;
 
    d->explicitEnable = e;
 
    QQuickItem *scope = parentItem();
    while (scope && !scope->isFocusScope())
        scope = scope->parentItem();
 
    d->setEffectiveEnableRecur(scope, d->calcEffectiveEnable());
}
 
bool QQuickItemPrivate::calcEffectiveVisible() const
{
    // An item is visible if it is a child of a visible parent, and not explicitly hidden.
    return explicitVisible && parentItem && QQuickItemPrivate::get(parentItem)->effectiveVisible;
}
 
bool QQuickItemPrivate::setEffectiveVisibleRecur(bool newEffectiveVisible)
{
    Q_Q(QQuickItem);
 
    if (newEffectiveVisible && !explicitVisible) {
        // This item locally overrides visibility
        return false;   // effective visibility didn't change
    }
 
    if (newEffectiveVisible == effectiveVisible) {
        // No change necessary
        return false;   // effective visibility didn't change
    }
 
    effectiveVisible = newEffectiveVisible;
    dirty(Visible);
    if (parentItem)
        QQuickItemPrivate::get(parentItem)->dirty(ChildrenStackingChanged);
    if (window)
        if (auto agent = deliveryAgentPrivate(); agent)
            agent->removeGrabber(q, true, true, true);
 
    bool childVisibilityChanged = false;
    for (int ii = 0; ii < childItems.size(); ++ii)
        childVisibilityChanged |= QQuickItemPrivate::get(childItems.at(ii))->setEffectiveVisibleRecur(newEffectiveVisible);
 
    itemChange(QQuickItem::ItemVisibleHasChanged, bool(effectiveVisible));
#if QT_CONFIG(accessibility)
    if (isAccessible) {
        QAccessibleEvent ev(q, effectiveVisible ? QAccessible::ObjectShow : QAccessible::ObjectHide);
        QAccessible::updateAccessibility(&ev);
    }
#endif
    if (!inDestructor) {
        emit q->visibleChanged();
        if (childVisibilityChanged)
            emit q->visibleChildrenChanged();
    }
 
    return true;    // effective visibility DID change
}
 
bool QQuickItemPrivate::calcEffectiveEnable() const
{
    // XXX todo - Should the effective enable of an element with no parent just be the current
    // effective enable?  This would prevent pointless re-processing in the case of an element
    // moving to/from a no-parent situation, but it is different from what graphics view does.
    return explicitEnable && (!parentItem || QQuickItemPrivate::get(parentItem)->effectiveEnable);
}
 
void QQuickItemPrivate::setEffectiveEnableRecur(QQuickItem *scope, bool newEffectiveEnable)
{
    Q_Q(QQuickItem);
 
    if (newEffectiveEnable && !explicitEnable) {
        // This item locally overrides enable
        return;
    }
 
    if (newEffectiveEnable == effectiveEnable) {
        // No change necessary
        return;
    }
 
    effectiveEnable = newEffectiveEnable;
 
    QQuickDeliveryAgentPrivate *da = deliveryAgentPrivate();
    if (da) {
        da->removeGrabber(q, true, true, true);
        if (scope && !effectiveEnable && activeFocus) {
            da->clearFocusInScope(scope, q, Qt::OtherFocusReason,
                                  QQuickDeliveryAgentPrivate::DontChangeFocusProperty |
                                  QQuickDeliveryAgentPrivate::DontChangeSubFocusItem);
        }
    }
 
    for (int ii = 0; ii < childItems.size(); ++ii) {
        QQuickItemPrivate::get(childItems.at(ii))->setEffectiveEnableRecur(
                (flags & QQuickItem::ItemIsFocusScope) && scope ? q : scope, newEffectiveEnable);
    }
 
    if (scope && effectiveEnable && focus && da) {
        da->setFocusInScope(scope, q, Qt::OtherFocusReason,
                            QQuickDeliveryAgentPrivate::DontChangeFocusProperty |
                            QQuickDeliveryAgentPrivate::DontChangeSubFocusItem);
    }
 
    itemChange(QQuickItem::ItemEnabledHasChanged, bool(effectiveEnable));
#if QT_CONFIG(accessibility)
    if (isAccessible) {
        QAccessible::State changedState;
        changedState.disabled = true;
        changedState.focusable = true;
        QAccessibleStateChangeEvent ev(q, changedState);
        QAccessible::updateAccessibility(&ev);
    }
#endif
    emit q->enabledChanged();
}
 
bool QQuickItemPrivate::isTransparentForPositioner() const
{
    return extra.isAllocated() && extra.value().transparentForPositioner;
}
 
void QQuickItemPrivate::setTransparentForPositioner(bool transparent)
{
    extra.value().transparentForPositioner = transparent;
}
 
 
QString QQuickItemPrivate::dirtyToString() const
{
#define DIRTY_TO_STRING(value) if (dirtyAttributes & value) { \
    if (!rv.isEmpty()) \
        rv.append(QLatin1Char('|')); \
    rv.append(QLatin1String(#value)); \
}
 
//    QString rv = QLatin1String("0x") + QString::number(dirtyAttributes, 16);
    QString rv;
 
    DIRTY_TO_STRING(TransformOrigin);
    DIRTY_TO_STRING(Transform);
    DIRTY_TO_STRING(BasicTransform);
    DIRTY_TO_STRING(Position);
    DIRTY_TO_STRING(Size);
    DIRTY_TO_STRING(ZValue);
    DIRTY_TO_STRING(Content);
    DIRTY_TO_STRING(Smooth);
    DIRTY_TO_STRING(OpacityValue);
    DIRTY_TO_STRING(ChildrenChanged);
    DIRTY_TO_STRING(ChildrenStackingChanged);
    DIRTY_TO_STRING(ParentChanged);
    DIRTY_TO_STRING(Clip);
    DIRTY_TO_STRING(Window);
    DIRTY_TO_STRING(EffectReference);
    DIRTY_TO_STRING(Visible);
    DIRTY_TO_STRING(HideReference);
    DIRTY_TO_STRING(Antialiasing);
 
    return rv;
}
 
void QQuickItemPrivate::dirty(DirtyType type)
{
    Q_Q(QQuickItem);
    if (!(dirtyAttributes & type) || (window && !prevDirtyItem)) {
        dirtyAttributes |= type;
        if (window && componentComplete) {
            addToDirtyList();
            QQuickWindowPrivate::get(window)->dirtyItem(q);
        }
    }
    if (type & (TransformOrigin | Transform | BasicTransform | Position | Size | Clip))
        transformChanged(q);
}
 
void QQuickItemPrivate::addToDirtyList()
{
    Q_Q(QQuickItem);
 
    Q_ASSERT(window);
    if (!prevDirtyItem) {
        Q_ASSERT(!nextDirtyItem);
 
        QQuickWindowPrivate *p = QQuickWindowPrivate::get(window);
        nextDirtyItem = p->dirtyItemList;
        if (nextDirtyItem) QQuickItemPrivate::get(nextDirtyItem)->prevDirtyItem = &nextDirtyItem;
        prevDirtyItem = &p->dirtyItemList;
        p->dirtyItemList = q;
        p->dirtyItem(q);
    }
    Q_ASSERT(prevDirtyItem);
}
 
void QQuickItemPrivate::removeFromDirtyList()
{
    if (prevDirtyItem) {
        if (nextDirtyItem) QQuickItemPrivate::get(nextDirtyItem)->prevDirtyItem = prevDirtyItem;
        *prevDirtyItem = nextDirtyItem;
        prevDirtyItem = nullptr;
        nextDirtyItem = nullptr;
    }
    Q_ASSERT(!prevDirtyItem);
    Q_ASSERT(!nextDirtyItem);
}
 
void QQuickItemPrivate::refFromEffectItem(bool hide)
{
    ++extra.value().effectRefCount;
    if (extra->effectRefCount == 1) {
        dirty(EffectReference);
        if (parentItem)
            QQuickItemPrivate::get(parentItem)->dirty(ChildrenStackingChanged);
    }
    if (hide) {
        if (++extra->hideRefCount == 1)
            dirty(HideReference);
    }
    recursiveRefFromEffectItem(1);
}
 
void QQuickItemPrivate::recursiveRefFromEffectItem(int refs)
{
    Q_Q(QQuickItem);
    if (!refs)
        return;
    extra.value().recursiveEffectRefCount += refs;
    for (int ii = 0; ii < childItems.size(); ++ii) {
        QQuickItem *child = childItems.at(ii);
        QQuickItemPrivate::get(child)->recursiveRefFromEffectItem(refs);
    }
    // Polish may rely on the effect ref count so trigger one, if item is not visible
    // (if visible, it will be triggered automatically).
    if (!effectiveVisible && refs > 0 && extra.value().recursiveEffectRefCount == 1) // it wasn't referenced, now it's referenced
        q->polish();
}
 
void QQuickItemPrivate::derefFromEffectItem(bool unhide)
{
    Q_ASSERT(extra->effectRefCount);
    --extra->effectRefCount;
    if (extra->effectRefCount == 0) {
        dirty(EffectReference);
        if (parentItem)
            QQuickItemPrivate::get(parentItem)->dirty(ChildrenStackingChanged);
    }
    if (unhide) {
        if (--extra->hideRefCount == 0)
            dirty(HideReference);
    }
    recursiveRefFromEffectItem(-1);
}
 
void QQuickItemPrivate::setCulled(bool cull)
{
    if (cull == culled)
        return;
 
    culled = cull;
    if ((cull && ++extra.value().hideRefCount == 1) || (!cull && --extra.value().hideRefCount == 0))
        dirty(HideReference);
}
 
void QQuickItemPrivate::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data)
{
    Q_Q(QQuickItem);
    switch (change) {
    case QQuickItem::ItemChildAddedChange: {
        q->itemChange(change, data);
        // The newly added child or any of its descendants may have
        // ItemObservesViewport set, in which case we need to both
        // inform the item that the transform has changed, and re-apply
        // subtreeTransformChangedEnabled to both this item and its
        // ancestors.
        if (QQuickItemPrivate::get(data.item)->transformChanged(q)) {
            if (!subtreeTransformChangedEnabled) {
                qCDebug(lcVP) << "turned on transformChanged notification for subtree of" << q;
                subtreeTransformChangedEnabled = true;
            }
            enableSubtreeChangeNotificationsForParentHierachy();
        }
        notifyChangeListeners(QQuickItemPrivate::Children, &QQuickItemChangeListener::itemChildAdded, q, data.item);
        break;
    }
    case QQuickItem::ItemChildRemovedChange: {
        q->itemChange(change, data);
        notifyChangeListeners(QQuickItemPrivate::Children, &QQuickItemChangeListener::itemChildRemoved, q, data.item);
        break;
    }
    case QQuickItem::ItemSceneChange:
        q->itemChange(change, data);
        break;
    case QQuickItem::ItemVisibleHasChanged: {
        q->itemChange(change, data);
        notifyChangeListeners(QQuickItemPrivate::Visibility, &QQuickItemChangeListener::itemVisibilityChanged, q);
        break;
    }
    case QQuickItem::ItemEnabledHasChanged: {
        q->itemChange(change, data);
        notifyChangeListeners(QQuickItemPrivate::Enabled, &QQuickItemChangeListener::itemEnabledChanged, q);
        break;
    }
    case QQuickItem::ItemParentHasChanged: {
        q->itemChange(change, data);
        notifyChangeListeners(QQuickItemPrivate::Parent, &QQuickItemChangeListener::itemParentChanged, q, data.item);
        break;
    }
    case QQuickItem::ItemOpacityHasChanged: {
        q->itemChange(change, data);
        notifyChangeListeners(QQuickItemPrivate::Opacity, &QQuickItemChangeListener::itemOpacityChanged, q);
        break;
    }
    case QQuickItem::ItemActiveFocusHasChanged:
        q->itemChange(change, data);
        break;
    case QQuickItem::ItemRotationHasChanged: {
        q->itemChange(change, data);
        notifyChangeListeners(QQuickItemPrivate::Rotation, &QQuickItemChangeListener::itemRotationChanged, q);
        break;
    }
    case QQuickItem::ItemAntialiasingHasChanged:
        // fall through
    case QQuickItem::ItemDevicePixelRatioHasChanged:
        q->itemChange(change, data);
        break;
    }
}
 
bool QQuickItem::smooth() const
{
    Q_D(const QQuickItem);
    return d->smooth;
}
void QQuickItem::setSmooth(bool smooth)
{
    Q_D(QQuickItem);
    if (d->smooth == smooth)
        return;
 
    d->smooth = smooth;
    d->dirty(QQuickItemPrivate::Smooth);
 
    emit smoothChanged(smooth);
}
 
// TODO FOCUS: Deprecate
bool QQuickItem::activeFocusOnTab() const
{
    Q_D(const QQuickItem);
    return d->activeFocusOnTab;
}
void QQuickItem::setActiveFocusOnTab(bool activeFocusOnTab)
{
    Q_D(QQuickItem);
    if (d->activeFocusOnTab == activeFocusOnTab)
        return;
 
    if (window()) {
        if ((this == window()->activeFocusItem()) && this != window()->contentItem() && !activeFocusOnTab) {
            qWarning("QQuickItem: Cannot set activeFocusOnTab to false once item is the active focus item.");
            return;
        }
    }
 
    d->activeFocusOnTab = activeFocusOnTab;
 
    emit activeFocusOnTabChanged(activeFocusOnTab);
}
 
bool QQuickItem::antialiasing() const
{
    Q_D(const QQuickItem);
    return d->antialiasingValid ? d->antialiasing : d->implicitAntialiasing;
}
 
void QQuickItem::setAntialiasing(bool aa)
{
    Q_D(QQuickItem);
 
    if (!d->antialiasingValid) {
        d->antialiasingValid = true;
        d->antialiasing = d->implicitAntialiasing;
    }
 
    if (aa == d->antialiasing)
        return;
 
    d->antialiasing = aa;
    d->dirty(QQuickItemPrivate::Antialiasing);
 
    d->itemChange(ItemAntialiasingHasChanged, bool(d->antialiasing));
 
    emit antialiasingChanged(antialiasing());
}
 
void QQuickItem::resetAntialiasing()
{
    Q_D(QQuickItem);
    if (!d->antialiasingValid)
        return;
 
    d->antialiasingValid = false;
 
    if (d->implicitAntialiasing != d->antialiasing)
        emit antialiasingChanged(antialiasing());
}
 
void QQuickItemPrivate::setImplicitAntialiasing(bool antialiasing)
{
    Q_Q(QQuickItem);
    bool prev = q->antialiasing();
    implicitAntialiasing = antialiasing;
    if (componentComplete && (q->antialiasing() != prev))
        emit q->antialiasingChanged(q->antialiasing());
}
 
QQuickItem::Flags QQuickItem::flags() const
{
    Q_D(const QQuickItem);
    return (QQuickItem::Flags)d->flags;
}
 
void QQuickItem::setFlag(Flag flag, bool enabled)
{
    Q_D(QQuickItem);
    if (enabled)
        setFlags((Flags)(d->flags | (quint32)flag));
    else
        setFlags((Flags)(d->flags & ~(quint32)flag));
 
    // We don't return early if the flag did not change. That's useful in case
    // we need to intentionally trigger this parent-chain traversal again.
    if (enabled && flag == ItemObservesViewport)
        d->enableSubtreeChangeNotificationsForParentHierachy();
}
 
void QQuickItemPrivate::enableSubtreeChangeNotificationsForParentHierachy()
{
    Q_Q(QQuickItem);
 
    QQuickItem *par = q->parentItem();
    while (par) {
        auto parPriv = QQuickItemPrivate::get(par);
        if (!parPriv->subtreeTransformChangedEnabled)
            qCDebug(lcVP) << "turned on transformChanged notification for subtree of" << par;
        parPriv->subtreeTransformChangedEnabled = true;
        par = par->parentItem();
    }
}
 
void QQuickItem::setFlags(Flags flags)
{
    Q_D(QQuickItem);
 
    if (int(flags & ItemIsFocusScope) != int(d->flags & ItemIsFocusScope)) {
        if (flags & ItemIsFocusScope && !d->childItems.isEmpty() && d->window) {
            qWarning("QQuickItem: Cannot set FocusScope once item has children and is in a window.");
            flags &= ~ItemIsFocusScope;
        } else if (d->flags & ItemIsFocusScope) {
            qWarning("QQuickItem: Cannot unset FocusScope flag.");
            flags |= ItemIsFocusScope;
        }
    }
 
    if (int(flags & ItemClipsChildrenToShape) != int(d->flags & ItemClipsChildrenToShape))
        d->dirty(QQuickItemPrivate::Clip);
 
    d->flags = flags;
}
 
qreal QQuickItem::x() const
{
    Q_D(const QQuickItem);
    return d->x;
}
 
qreal QQuickItem::y() const
{
    Q_D(const QQuickItem);
    return d->y;
}
 
QPointF QQuickItem::position() const
{
    Q_D(const QQuickItem);
    return QPointF(d->x, d->y);
}
 
void QQuickItem::setX(qreal v)
{
    Q_D(QQuickItem);
    /* There are two ways in which this function might be called:
       a) Either directly by the user, or
       b) when a binding has evaluated to a new value and it writes
          the value back
       In the first case, we want to remove an existing binding, in
       the second case, we don't want to remove the binding which
       just wrote the value.
       removeBindingUnlessInWrapper takes care of this.
     */
    d->x.removeBindingUnlessInWrapper();
    if (qt_is_nan(v))
        return;
 
    const qreal oldx = d->x.valueBypassingBindings();
    if (oldx == v)
        return;
 
    d->x.setValueBypassingBindings(v);
 
    d->dirty(QQuickItemPrivate::Position);
 
    const qreal y = d->y.valueBypassingBindings();
    const qreal w = d->width.valueBypassingBindings();
    const qreal h = d->height.valueBypassingBindings();
    geometryChange(QRectF(v, y, w, h), QRectF(oldx, y, w, h));
}
 
void QQuickItem::setY(qreal v)
{
    Q_D(QQuickItem);
    d->y.removeBindingUnlessInWrapper();
    if (qt_is_nan(v))
        return;
 
    const qreal oldy = d->y.valueBypassingBindings();
    if (oldy == v)
        return;
 
    d->y.setValueBypassingBindings(v);
 
    d->dirty(QQuickItemPrivate::Position);
 
    // we use v instead of d->y, as that avoid a method call
    // and we have v anyway in scope
    const qreal x = d->x.valueBypassingBindings();
    const qreal w = d->width.valueBypassingBindings();
    const qreal h = d->height.valueBypassingBindings();
    geometryChange(QRectF(x, v, w, h), QRectF(x, oldy, w, h));
}
 
void QQuickItem::setPosition(const QPointF &pos)
{
    Q_D(QQuickItem);
 
    const qreal oldx = d->x.valueBypassingBindings();
    const qreal oldy = d->y.valueBypassingBindings();
 
    if (QPointF(oldx, oldy) == pos)
        return;
 
    /* This preserves the bindings, because that was what the code used to do
       The effect of this is that you can have
       Item {
            Rectangle {
                x: someValue; y: someValue
                DragHandler {}
            }
       }
       and you can move the rectangle around; once someValue changes, the position gets
       reset again (even when a drag is currently ongoing).
       Whether we want this is up to discussion.
    */
 
    d->x.setValueBypassingBindings(pos.x()); //TODO: investigate whether to break binding here or not
    d->y.setValueBypassingBindings(pos.y());
 
    d->dirty(QQuickItemPrivate::Position);
 
    const qreal w = d->width.valueBypassingBindings();
    const qreal h = d->height.valueBypassingBindings();
    geometryChange(QRectF(pos.x(), pos.y(), w, h), QRectF(oldx, oldy, w, h));
}
 
/* The bindable methods return an object which supports inspection (hasBinding) and
   modification (setBinding, removeBinding) of the properties bindable state.
*/
QBindable<qreal> QQuickItem::bindableX()
{
    return QBindable<qreal>(&d_func()->x);
}
 
QBindable<qreal> QQuickItem::bindableY()
{
    return QBindable<qreal>(&d_func()->y);
}
 
qreal QQuickItem::width() const
{
    Q_D(const QQuickItem);
    return d->width;
}
 
void QQuickItem::setWidth(qreal w)
{
    Q_D(QQuickItem);
    d->width.removeBindingUnlessInWrapper();
    if (qt_is_nan(w))
        return;
 
    d->widthValidFlag = true;
    const qreal oldWidth = d->width.valueBypassingBindings();
    if (oldWidth == w)
        return;
 
    d->width.setValueBypassingBindings(w);
 
    d->dirty(QQuickItemPrivate::Size);
 
    const qreal x = d->x.valueBypassingBindings();
    const qreal y = d->y.valueBypassingBindings();
    const qreal h = d->height.valueBypassingBindings();
    geometryChange(QRectF(x, y, w, h), QRectF(x, y, oldWidth, h));
}
 
void QQuickItem::resetWidth()
{
    Q_D(QQuickItem);
    d->width.takeBinding();
    d->widthValidFlag = false;
    setImplicitWidth(implicitWidth());
}
 
void QQuickItemPrivate::implicitWidthChanged()
{
    Q_Q(QQuickItem);
    notifyChangeListeners(QQuickItemPrivate::ImplicitWidth, &QQuickItemChangeListener::itemImplicitWidthChanged, q);
    emit q->implicitWidthChanged();
}
 
qreal QQuickItemPrivate::getImplicitWidth() const
{
    return implicitWidth;
}
qreal QQuickItem::implicitWidth() const
{
    Q_D(const QQuickItem);
    return d->getImplicitWidth();
}
 
QBindable<qreal> QQuickItem::bindableWidth()
{
    return QBindable<qreal>(&d_func()->width);
}
 
void QQuickItem::setImplicitWidth(qreal w)
{
    Q_D(QQuickItem);
    bool changed = w != d->implicitWidth;
    d->implicitWidth = w;
    // this uses valueBypassingBindings simply to avoid repeated "am I in a binding" checks
    if (d->width.valueBypassingBindings() == w || widthValid()) {
        if (changed)
            d->implicitWidthChanged();
        if (d->width.valueBypassingBindings() == w || widthValid())
            return;
        changed = false;
    }
 
    const qreal oldWidth = d->width.valueBypassingBindings();
    Q_ASSERT(!d->width.hasBinding() || QQmlPropertyBinding::isUndefined(d->width.binding()));
    // we need to keep the binding if its undefined (therefore we can't use operator=/setValue)
    d->width.setValueBypassingBindings(w);
 
    d->dirty(QQuickItemPrivate::Size);
 
    const qreal x = d->x.valueBypassingBindings();
    const qreal y = d->y.valueBypassingBindings();
    const qreal width = w;
    const qreal height = d->height.valueBypassingBindings();
    geometryChange(QRectF(x, y, width, height), QRectF(x, y, oldWidth, height));
 
    if (changed)
        d->implicitWidthChanged();
}
 
bool QQuickItem::widthValid() const
{
    Q_D(const QQuickItem);
    /* Logic: The width is valid if we assigned a value
       or a binding to it. Note that a binding evaluation to
       undefined (and thus calling resetWidth) is detached [1];
       hasBinding will thus return false for it, which is
       what we want here, as resetting width should mean that
       width is invalid (until the binding evaluates to a
       non-undefined value again).
 
       [1]: A detached binding is a binding which is not set on a property.
       In the case of QQmlPropertyBinding and resettable properties, it
       still gets reevaluated when it was detached due to the binding
       returning undefined, and it gets re-attached, once the binding changes
       to a non-undefined value (unless another binding has beenset in the
       meantime).
       See QQmlPropertyBinding::isUndefined and handleUndefinedAssignment
    */
 
    return d->widthValid();
}
 
qreal QQuickItem::height() const
{
    Q_D(const QQuickItem);
    return d->height;
}
 
void QQuickItem::setHeight(qreal h)
{
    Q_D(QQuickItem);
    // Note that we call removeUnlessInWrapper before returning in the
    // NaN and equal value cases; that ensures that an explicit setHeight
    // always removes the binding
    d->height.removeBindingUnlessInWrapper();
    if (qt_is_nan(h))
        return;
 
    d->heightValidFlag = true;
    const qreal oldHeight = d->height.valueBypassingBindings();
    if (oldHeight == h)
        return;
 
    d->height.setValueBypassingBindings(h);
 
    d->dirty(QQuickItemPrivate::Size);
 
    const qreal x = d->x.valueBypassingBindings();
    const qreal y = d->y.valueBypassingBindings();
    const qreal w = d->width.valueBypassingBindings();
    geometryChange(QRectF(x, y, w, h), QRectF(x, y, w, oldHeight));
}
 
void QQuickItem::resetHeight()
{
    Q_D(QQuickItem);
    // using takeBinding, we remove any existing binding from the
    // property, but preserve the existing value (and avoid some overhead
    // compared to calling setHeight(height())
    d->height.takeBinding();
    d->heightValidFlag = false;
    setImplicitHeight(implicitHeight());
}
 
void QQuickItemPrivate::implicitHeightChanged()
{
    Q_Q(QQuickItem);
    notifyChangeListeners(QQuickItemPrivate::ImplicitHeight, &QQuickItemChangeListener::itemImplicitHeightChanged, q);
    emit q->implicitHeightChanged();
}
 
qreal QQuickItemPrivate::getImplicitHeight() const
{
    return implicitHeight;
}
 
qreal QQuickItem::implicitHeight() const
{
    Q_D(const QQuickItem);
    return d->getImplicitHeight();
}
 
QBindable<qreal> QQuickItem::bindableHeight()
{
    return QBindable<qreal>(&d_func()->height);
}
 
void QQuickItem::setImplicitHeight(qreal h)
{
    Q_D(QQuickItem);
    bool changed = h != d->implicitHeight;
    d->implicitHeight = h;
    if (d->height.valueBypassingBindings() == h || heightValid()) {
        if (changed)
            d->implicitHeightChanged();
        if (d->height.valueBypassingBindings() == h || heightValid())
            return;
        changed = false;
    }
 
    const qreal oldHeight = d->height.valueBypassingBindings();
    Q_ASSERT(!d->height.hasBinding() || QQmlPropertyBinding::isUndefined(d->height.binding()));
    // we need to keep the binding if its undefined (therefore we can't use operator=/setValue)
    d->height.setValueBypassingBindings(h);
 
    d->dirty(QQuickItemPrivate::Size);
 
    const qreal x = d->x.valueBypassingBindings();
    const qreal y = d->y.valueBypassingBindings();
    const qreal width = d->width.valueBypassingBindings();
    const qreal height = d->height.valueBypassingBindings();
    geometryChange(QRectF(x, y, width, height),
                   QRectF(x, y, width, oldHeight));
 
    if (changed)
        d->implicitHeightChanged();
}
 
void QQuickItem::setImplicitSize(qreal w, qreal h)
{
    Q_D(QQuickItem);
    bool wChanged = w != d->implicitWidth;
    bool hChanged = h != d->implicitHeight;
 
    d->implicitWidth = w;
    d->implicitHeight = h;
 
    bool wDone = false;
    bool hDone = false;
    qreal width = d->width.valueBypassingBindings();
    qreal height = d->height.valueBypassingBindings();
    if (width == w || widthValid()) {
        if (wChanged)
            d->implicitWidthChanged();
        wDone = width == w || widthValid();
        wChanged = false;
    }
    if (height == h || heightValid()) {
        if (hChanged)
            d->implicitHeightChanged();
        hDone = height == h || heightValid();
        hChanged = false;
    }
    if (wDone && hDone)
        return;
 
    const qreal oldWidth = width;
    const qreal oldHeight = height;
    if (!wDone) {
        width = w;
        d->width.setValueBypassingBindings(w);
    }
    if (!hDone) {
        height = h;
        d->height.setValueBypassingBindings(h);
    }
 
    d->dirty(QQuickItemPrivate::Size);
 
    const qreal x = d->x.valueBypassingBindings();
    const qreal y = d->y.valueBypassingBindings();
    geometryChange(QRectF(x, y, width, height),
                   QRectF(x, y, oldWidth, oldHeight));
 
    if (!wDone && wChanged)
        d->implicitWidthChanged();
    if (!hDone && hChanged)
        d->implicitHeightChanged();
}
 
bool QQuickItem::heightValid() const
{
    Q_D(const QQuickItem);
    return d->heightValid();
}
 
QSizeF QQuickItem::size() const
{
    Q_D(const QQuickItem);
    return QSizeF(d->width, d->height);
}
 
 
void QQuickItem::setSize(const QSizeF &size)
{
    Q_D(QQuickItem);
    d->heightValidFlag = true;
    d->widthValidFlag = true;
 
    const qreal oldHeight = d->height.valueBypassingBindings();
    const qreal oldWidth = d->width.valueBypassingBindings();
 
    if (oldWidth == size.width() && oldHeight == size.height())
        return;
 
    d->height.setValueBypassingBindings(size.height());
    d->width.setValueBypassingBindings(size.width());
 
    d->dirty(QQuickItemPrivate::Size);
 
    const qreal x = d->x.valueBypassingBindings();
    const qreal y = d->y.valueBypassingBindings();
    geometryChange(QRectF(x, y, size.width(), size.height()), QRectF(x, y, oldWidth, oldHeight));
}
 
bool QQuickItem::hasActiveFocus() const
{
    Q_D(const QQuickItem);
    return d->activeFocus;
}
 
bool QQuickItem::hasFocus() const
{
    Q_D(const QQuickItem);
    return d->focus;
}
 
void QQuickItem::setFocus(bool focus)
{
    setFocus(focus, Qt::OtherFocusReason);
}
 
void QQuickItem::setFocus(bool focus, Qt::FocusReason reason)
{
    Q_D(QQuickItem);
    // Need to find our nearest focus scope
    QQuickItem *scope = parentItem();
    while (scope && !scope->isFocusScope() && scope->parentItem())
        scope = scope->parentItem();
 
    if (d->focus == focus && (!focus || !scope || QQuickItemPrivate::get(scope)->subFocusItem == this))
        return;
 
    bool notifyListeners = false;
    if (d->window || d->parentItem) {
        if (d->window) {
            auto da = d->deliveryAgentPrivate();
            Q_ASSERT(da);
            if (focus)
                da->setFocusInScope(scope, this, reason);
            else
                da->clearFocusInScope(scope, this, reason);
        } else {
            // do the focus changes from setFocusInScope/clearFocusInScope that are
            // unrelated to a window
            QVarLengthArray<QQuickItem *, 20> changed;
            QQuickItem *oldSubFocusItem = QQuickItemPrivate::get(scope)->subFocusItem;
            if (oldSubFocusItem) {
                QQuickItemPrivate::get(oldSubFocusItem)->updateSubFocusItem(scope, false);
                QQuickItemPrivate::get(oldSubFocusItem)->focus = false;
                changed << oldSubFocusItem;
            } else if (!scope->isFocusScope() && scope->hasFocus()) {
                QQuickItemPrivate::get(scope)->focus = false;
                changed << scope;
            }
            d->updateSubFocusItem(scope, focus);
 
            d->focus = focus;
            changed << this;
            notifyListeners = true;
            emit focusChanged(focus);
 
            QQuickDeliveryAgentPrivate::notifyFocusChangesRecur(changed.data(), changed.size() - 1, reason);
        }
    } else {
        QVarLengthArray<QQuickItem *, 20> changed;
        QQuickItem *oldSubFocusItem = d->subFocusItem;
        if (!isFocusScope() && oldSubFocusItem) {
            QQuickItemPrivate::get(oldSubFocusItem)->updateSubFocusItem(this, false);
            QQuickItemPrivate::get(oldSubFocusItem)->focus = false;
            changed << oldSubFocusItem;
        }
 
        d->focus = focus;
        changed << this;
        notifyListeners = true;
        emit focusChanged(focus);
 
        QQuickDeliveryAgentPrivate::notifyFocusChangesRecur(changed.data(), changed.size() - 1, reason);
    }
    if (notifyListeners)
        d->notifyChangeListeners(QQuickItemPrivate::Focus, &QQuickItemChangeListener::itemFocusChanged, this, reason);
}
 
bool QQuickItem::isFocusScope() const
{
    return flags() & ItemIsFocusScope;
}
 
QQuickItem *QQuickItem::scopedFocusItem() const
{
    Q_D(const QQuickItem);
    if (!isFocusScope())
        return nullptr;
    else
        return d->subFocusItem;
}
 
Qt::FocusPolicy QQuickItem::focusPolicy() const
{
    Q_D(const QQuickItem);
    uint policy = d->focusPolicy;
    if (activeFocusOnTab())
        policy |= Qt::TabFocus;
    return static_cast<Qt::FocusPolicy>(policy);
}
 
void QQuickItem::setFocusPolicy(Qt::FocusPolicy policy)
{
    Q_D(QQuickItem);
    if (d->focusPolicy == policy)
        return;
 
    d->focusPolicy = policy;
    setActiveFocusOnTab(policy & Qt::TabFocus);
    emit focusPolicyChanged(policy);
}
 
bool QQuickItem::isAncestorOf(const QQuickItem *child) const
{
    if (!child || child == this)
        return false;
    const QQuickItem *ancestor = child;
    while ((ancestor = ancestor->parentItem())) {
        if (ancestor == this)
            return true;
    }
    return false;
}
 
Qt::MouseButtons QQuickItem::acceptedMouseButtons() const
{
    Q_D(const QQuickItem);
    return d->acceptedMouseButtons();
}
 
void QQuickItem::setAcceptedMouseButtons(Qt::MouseButtons buttons)
{
    Q_D(QQuickItem);
    d->extra.setTag(d->extra.tag().setFlag(QQuickItemPrivate::LeftMouseButtonAccepted, buttons & Qt::LeftButton));
 
    buttons &= ~Qt::LeftButton;
    if (buttons || d->extra.isAllocated()) {
        d->extra.value().acceptedMouseButtonsWithoutHandlers = buttons;
        d->extra.value().acceptedMouseButtons = d->extra->pointerHandlers.isEmpty() ? buttons : Qt::AllButtons;
    }
}
 
bool QQuickItem::filtersChildMouseEvents() const
{
    Q_D(const QQuickItem);
    return d->filtersChildMouseEvents;
}
 
void QQuickItem::setFiltersChildMouseEvents(bool filter)
{
    Q_D(QQuickItem);
    d->filtersChildMouseEvents = filter;
}
 
bool QQuickItem::isUnderMouse() const
{
    Q_D(const QQuickItem);
    if (!d->window)
        return false;
 
    // QQuickWindow handles QEvent::Leave to reset the lastMousePosition
    // FIXME: Using QPointF() as the reset value means an item will not be
    // under the mouse if the mouse is at 0,0 of the window.
    if (const_cast<QQuickItemPrivate *>(d)->deliveryAgentPrivate()->lastMousePosition == QPointF())
        return false;
 
    QPointF cursorPos = QGuiApplicationPrivate::lastCursorPosition;
    return contains(mapFromScene(d->window->mapFromGlobal(cursorPos)));
}
 
bool QQuickItem::acceptHoverEvents() const
{
    Q_D(const QQuickItem);
    return d->hoverEnabled;
}
 
void QQuickItem::setAcceptHoverEvents(bool enabled)
{
    Q_D(QQuickItem);
    d->hoverEnabled = enabled;
    d->setHasHoverInChild(enabled);
    // The DA needs to resolve which items and handlers should now be hovered or unhovered.
    // Marking this item dirty ensures that flushFrameSynchronousEvents() will be called from the render loop,
    // even if this change is not in response to a mouse event and no item has already marked itself dirty.
    d->dirty(QQuickItemPrivate::Content);
}
 
bool QQuickItem::acceptTouchEvents() const
{
    Q_D(const QQuickItem);
    return d->touchEnabled;
}
 
void QQuickItem::setAcceptTouchEvents(bool enabled)
{
    Q_D(QQuickItem);
    d->touchEnabled = enabled;
}
 
void QQuickItemPrivate::setHasCursorInChild(bool hc)
{
#if QT_CONFIG(cursor)
    Q_Q(QQuickItem);
 
    // if we're asked to turn it off (because of an unsetcursor call, or a node
    // removal) then we should make sure it's really ok to turn it off.
    if (!hc && subtreeCursorEnabled) {
        if (hasCursor)
            return; // nope! sorry, I have a cursor myself
        for (QQuickItem *otherChild : std::as_const(childItems)) {
            QQuickItemPrivate *otherChildPrivate = QQuickItemPrivate::get(otherChild);
            if (otherChildPrivate->subtreeCursorEnabled || otherChildPrivate->hasCursor)
                return; // nope! sorry, something else wants it kept on.
        }
    }
 
    subtreeCursorEnabled = hc;
    QQuickItem *parent = q->parentItem();
    if (parent) {
        QQuickItemPrivate *parentPrivate = QQuickItemPrivate::get(parent);
        parentPrivate->setHasCursorInChild(hc);
    }
#else
    Q_UNUSED(hc);
#endif
}
 
void QQuickItemPrivate::setHasHoverInChild(bool hasHover)
{
    Q_Q(QQuickItem);
 
    // if we're asked to turn it off (because of a setAcceptHoverEvents call, or a node
    // removal) then we should make sure it's really ok to turn it off.
    if (!hasHover && subtreeHoverEnabled) {
        if (hoverEnabled)
            return; // nope! sorry, I need hover myself
        if (hasEnabledHoverHandlers())
            return; // nope! sorry, this item has enabled HoverHandlers
 
        for (QQuickItem *otherChild : std::as_const(childItems)) {
            QQuickItemPrivate *otherChildPrivate = QQuickItemPrivate::get(otherChild);
            if (otherChildPrivate->subtreeHoverEnabled || otherChildPrivate->hoverEnabled)
                return; // nope! sorry, something else wants it kept on.
            if (otherChildPrivate->hasEnabledHoverHandlers())
                return; // nope! sorry, we have pointer handlers which are interested.
        }
    }
 
    qCDebug(lcHoverTrace) << q << subtreeHoverEnabled << "->" << hasHover;
    subtreeHoverEnabled = hasHover;
    QQuickItem *parent = q->parentItem();
    if (parent) {
        QQuickItemPrivate *parentPrivate = QQuickItemPrivate::get(parent);
        parentPrivate->setHasHoverInChild(hasHover);
    }
}
 
#if QT_CONFIG(cursor)
 
QCursor QQuickItem::cursor() const
{
    Q_D(const QQuickItem);
    return d->extra.isAllocated()
            ? d->extra->cursor
            : QCursor();
}
 
void QQuickItem::setCursor(const QCursor &cursor)
{
    Q_D(QQuickItem);
 
    Qt::CursorShape oldShape = d->extra.isAllocated() ? d->extra->cursor.shape() : Qt::ArrowCursor;
    qCDebug(lcHoverTrace) << oldShape << "->" << cursor.shape();
 
    if (oldShape != cursor.shape() || oldShape >= Qt::LastCursor || cursor.shape() >= Qt::LastCursor) {
        d->extra.value().cursor = cursor;
        if (d->window) {
            QWindow *renderWindow = QQuickRenderControl::renderWindowFor(d->window);
            QWindow *window = renderWindow ? renderWindow : d->window; // this may not be a QQuickWindow
            if (QQuickWindowPrivate::get(d->window)->cursorItem == this)
                window->setCursor(cursor);
        }
    }
 
    QPointF updateCursorPos;
    if (!d->hasCursor) {
        d->hasCursor = true;
        if (d->window) {
            QWindow *renderWindow = QQuickRenderControl::renderWindowFor(d->window);
            QWindow *window = renderWindow ? renderWindow : d->window;
            QPointF pos = window->mapFromGlobal(QGuiApplicationPrivate::lastCursorPosition);
            if (contains(mapFromScene(pos)))
                updateCursorPos = pos;
        }
    }
    d->setHasCursorInChild(d->hasCursor || d->hasCursorHandler);
    if (!updateCursorPos.isNull())
        QQuickWindowPrivate::get(d->window)->updateCursor(updateCursorPos);
}
 
void QQuickItem::unsetCursor()
{
    Q_D(QQuickItem);
    qCDebug(lcHoverTrace) << "clearing cursor";
    if (!d->hasCursor)
        return;
    d->hasCursor = false;
    d->setHasCursorInChild(d->hasCursorHandler);
    if (d->extra.isAllocated())
        d->extra->cursor = QCursor();
 
    if (d->window) {
        QQuickWindowPrivate *windowPrivate = QQuickWindowPrivate::get(d->window);
        if (windowPrivate->cursorItem == this) {
            QPointF pos = d->window->mapFromGlobal(QGuiApplicationPrivate::lastCursorPosition);
            windowPrivate->updateCursor(pos);
        }
    }
}
 
QCursor QQuickItemPrivate::effectiveCursor(const QQuickPointerHandler *handler) const
{
    Q_Q(const QQuickItem);
    if (!handler)
        return q->cursor();
    bool hoverCursorSet = false;
    QCursor hoverCursor;
    bool activeCursorSet = false;
    QCursor activeCursor;
    if (const QQuickHoverHandler *hoverHandler = qobject_cast<const QQuickHoverHandler *>(handler)) {
        hoverCursorSet = hoverHandler->isCursorShapeExplicitlySet();
        hoverCursor = hoverHandler->cursorShape();
    } else if (handler->active()) {
        activeCursorSet = handler->isCursorShapeExplicitlySet();
        activeCursor = handler->cursorShape();
    }
    if (activeCursorSet)
        return activeCursor;
    if (hoverCursorSet)
        return hoverCursor;
    return q->cursor();
}
 
QQuickPointerHandler *QQuickItemPrivate::effectiveCursorHandler() const
{
    if (!hasPointerHandlers())
        return nullptr;
    QQuickPointerHandler* activeHandler = nullptr;
    QQuickPointerHandler* mouseHandler = nullptr;
    QQuickPointerHandler* nonMouseHandler = nullptr;
    for (QQuickPointerHandler *h : extra->pointerHandlers) {
        if (!h->isCursorShapeExplicitlySet())
            continue;
        QQuickHoverHandler *hoverHandler = qmlobject_cast<QQuickHoverHandler *>(h);
        // Prioritize any HoverHandler that is reacting to a non-mouse device.
        // Otherwise, choose the first hovered handler that is found.
        // TODO maybe: there was an idea to add QPointerDevice* as argument to this function
        // and check the device type, but why? HoverHandler already does that.
        if (!activeHandler && hoverHandler && hoverHandler->isHovered()) {
            qCDebug(lcHoverTrace) << hoverHandler << hoverHandler->acceptedDevices() << "wants to set cursor" << hoverHandler->cursorShape();
            if (hoverHandler->acceptedDevices().testFlag(QPointingDevice::DeviceType::Mouse)) {
                // If there's a conflict, the last-added HoverHandler wins.  Maybe the user is overriding a default...
                if (mouseHandler && mouseHandler->cursorShape() != hoverHandler->cursorShape()) {
                    qCDebug(lcHoverTrace) << "mouse cursor conflict:" << mouseHandler << "wants" << mouseHandler->cursorShape()
                                          << "but" << hoverHandler << "wants" << hoverHandler->cursorShape();
                }
                mouseHandler = hoverHandler;
            } else {
                // If there's a conflict, the last-added HoverHandler wins.
                if (nonMouseHandler && nonMouseHandler->cursorShape() != hoverHandler->cursorShape()) {
                    qCDebug(lcHoverTrace) << "non-mouse cursor conflict:" << nonMouseHandler << "wants" << nonMouseHandler->cursorShape()
                                          << "but" << hoverHandler << "wants" << hoverHandler->cursorShape();
                }
                nonMouseHandler = hoverHandler;
            }
        }
        if (!hoverHandler && h->active())
            activeHandler = h;
    }
    if (activeHandler) {
        qCDebug(lcHoverTrace) << "active handler choosing cursor" << activeHandler << activeHandler->cursorShape();
        return activeHandler;
    }
    // Mouse events are often synthetic; so if a HoverHandler for a non-mouse device wanted to set the cursor,
    // let it win, unless more than kCursorOverrideTimeout ms have passed
    // since the last time the non-mouse handler actually reacted to an event.
    // We could miss the fact that a tablet stylus has left proximity, because we don't deliver proximity events to windows.
    if (nonMouseHandler) {
        if (mouseHandler) {
            const bool beforeTimeout =
                QQuickPointerHandlerPrivate::get(mouseHandler)->lastEventTime <
                QQuickPointerHandlerPrivate::get(nonMouseHandler)->lastEventTime + kCursorOverrideTimeout;
            QQuickPointerHandler *winner = (beforeTimeout ? nonMouseHandler : mouseHandler);
            qCDebug(lcHoverTrace) << "non-mouse handler reacted last time:" << QQuickPointerHandlerPrivate::get(nonMouseHandler)->lastEventTime
                                  << "and mouse handler reacted at time:" << QQuickPointerHandlerPrivate::get(mouseHandler)->lastEventTime
                                  << "choosing cursor according to" << winner << winner->cursorShape();
            return winner;
        }
        qCDebug(lcHoverTrace) << "non-mouse handler choosing cursor" << nonMouseHandler << nonMouseHandler->cursorShape();
        return nonMouseHandler;
    }
    if (mouseHandler)
        qCDebug(lcHoverTrace) << "mouse handler choosing cursor" << mouseHandler << mouseHandler->cursorShape();
    return mouseHandler;
}
 
#endif
 
void QQuickItem::grabMouse()
{
    Q_D(QQuickItem);
    if (!d->window)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    auto eventInDelivery = da->eventInDelivery();
    if (!eventInDelivery) {
        qWarning() << "cannot grab mouse: no event is currently being delivered";
        return;
    }
    auto epd = da->mousePointData();
    eventInDelivery->setExclusiveGrabber(epd->eventPoint, this);
}
 
void QQuickItem::ungrabMouse()
{
    Q_D(QQuickItem);
    if (!d->window)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    auto eventInDelivery = da->eventInDelivery();
    if (!eventInDelivery) {
        // do it the expensive way
        da->removeGrabber(this);
        return;
    }
    const auto &eventPoint = da->mousePointData()->eventPoint;
    if (eventInDelivery->exclusiveGrabber(eventPoint) == this)
        eventInDelivery->setExclusiveGrabber(eventPoint, nullptr);
}
 
bool QQuickItem::keepMouseGrab() const
{
    Q_D(const QQuickItem);
    return d->keepMouse;
}
 
void QQuickItem::setKeepMouseGrab(bool keep)
{
    Q_D(QQuickItem);
    d->keepMouse = keep;
}
 
void QQuickItem::grabTouchPoints(const QList<int> &ids)
{
    Q_D(QQuickItem);
    auto event = d->deliveryAgentPrivate()->eventInDelivery();
    if (Q_UNLIKELY(!event)) {
        qWarning() << "cannot grab: no event is currently being delivered";
        return;
    }
    for (auto pt : event->points()) {
        if (ids.contains(pt.id()))
            event->setExclusiveGrabber(pt, this);
    }
}
 
void QQuickItem::ungrabTouchPoints()
{
    Q_D(QQuickItem);
    if (!d->window)
        return;
    d->deliveryAgentPrivate()->removeGrabber(this, false, true);
}
 
bool QQuickItem::keepTouchGrab() const
{
    Q_D(const QQuickItem);
    return d->keepTouch;
}
 
void QQuickItem::setKeepTouchGrab(bool keep)
{
    Q_D(QQuickItem);
    d->keepTouch = keep;
}
 
bool QQuickItem::contains(const QPointF &point) const
{
    Q_D(const QQuickItem);
    if (d->extra.isAllocated() && d->extra->mask) {
        if (auto quickMask = qobject_cast<QQuickItem *>(d->extra->mask))
            return quickMask->contains(point - quickMask->position());
 
        bool res = false;
        QMetaMethod maskContains = d->extra->mask->metaObject()->method(d->extra->maskContainsIndex);
        maskContains.invoke(d->extra->mask,
                      Qt::DirectConnection,
                      Q_RETURN_ARG(bool, res),
                      Q_ARG(QPointF, point));
        return res;
    }
 
    qreal x = point.x();
    qreal y = point.y();
    return x >= 0 && y >= 0 && x < d->width && y < d->height;
}
 
QObject *QQuickItem::containmentMask() const
{
    Q_D(const QQuickItem);
    if (!d->extra.isAllocated())
        return nullptr;
    return d->extra->mask.data();
}
 
void QQuickItem::setContainmentMask(QObject *mask)
{
    Q_D(QQuickItem);
    const bool extraDataExists = d->extra.isAllocated();
    // an Item can't mask itself (to prevent infinite loop in contains())
    if (mask == static_cast<QObject *>(this))
        return;
    // mask is null, and we had no mask
    if (!extraDataExists && !mask)
        return;
    // mask is non-null and the same
    if (extraDataExists && d->extra->mask == mask)
        return;
 
    QQuickItem *quickMask = d->extra.isAllocated() ? qobject_cast<QQuickItem *>(d->extra->mask)
                                                   : nullptr;
    if (quickMask) {
        QQuickItemPrivate *maskPrivate = QQuickItemPrivate::get(quickMask);
        maskPrivate->registerAsContainmentMask(this, false); // removed from use as my mask
    }
 
    if (!extraDataExists)
        d->extra.value(); // ensure extra exists
    if (mask) {
        int methodIndex = mask->metaObject()->indexOfMethod(QByteArrayLiteral("contains(QPointF)"));
        if (methodIndex < 0) {
            qmlWarning(this) << QStringLiteral("QQuickItem: Object set as mask does not have an invokable contains method, ignoring it.");
            return;
        }
        d->extra->maskContainsIndex = methodIndex;
    }
    d->extra->mask = mask;
    quickMask = qobject_cast<QQuickItem *>(mask);
    if (quickMask) {
        QQuickItemPrivate *maskPrivate = QQuickItemPrivate::get(quickMask);
        maskPrivate->registerAsContainmentMask(this, true); // telling maskPrivate that "this" is using it as mask
    }
    emit containmentMaskChanged();
}
 
QPointF QQuickItem::mapToItem(const QQuickItem *item, const QPointF &point) const
{
    QPointF p = mapToScene(point);
    if (item) {
        const QQuickWindow *itemWindow = item->window();
        if (itemWindow != nullptr && itemWindow != window())
            p = itemWindow->mapFromGlobal(window()->mapToGlobal(p));
 
        p = item->mapFromScene(p);
    }
    return p;
}
 
QPointF QQuickItem::mapToScene(const QPointF &point) const
{
    Q_D(const QQuickItem);
    return d->itemToWindowTransform().map(point);
}
 
QPointF QQuickItem::mapToGlobal(const QPointF &point) const
{
    Q_D(const QQuickItem);
    return d->windowToGlobalTransform().map(mapToScene(point));
}
 
QRectF QQuickItem::mapRectToItem(const QQuickItem *item, const QRectF &rect) const
{
    Q_D(const QQuickItem);
    QTransform t = d->itemToWindowTransform();
    if (item)
        t *= QQuickItemPrivate::get(item)->windowToItemTransform();
    return t.mapRect(rect);
}
 
QRectF QQuickItem::mapRectToScene(const QRectF &rect) const
{
    Q_D(const QQuickItem);
    return d->itemToWindowTransform().mapRect(rect);
}
 
QPointF QQuickItem::mapFromItem(const QQuickItem *item, const QPointF &point) const
{
    QPointF p = point;
    if (item) {
        p = item->mapToScene(point);
 
        if (item->window() != window())
            p = window()->mapFromGlobal(item->window()->mapToGlobal(p));
    }
    return mapFromScene(p);
}
 
QPointF QQuickItem::mapFromScene(const QPointF &point) const
{
    Q_D(const QQuickItem);
    return d->windowToItemTransform().map(point);
}
 
QPointF QQuickItem::mapFromGlobal(const QPointF &point) const
{
    Q_D(const QQuickItem);
    QPointF scenePoint = d->globalToWindowTransform().map(point);
    if (auto da = QQuickDeliveryAgentPrivate::currentOrItemDeliveryAgent(this)) {
        if (auto sceneTransform = da->sceneTransform())
            scenePoint = sceneTransform->map(scenePoint);
    }
    return mapFromScene(scenePoint);
}
 
QRectF QQuickItem::mapRectFromItem(const QQuickItem *item, const QRectF &rect) const
{
    Q_D(const QQuickItem);
    QTransform t = item?QQuickItemPrivate::get(item)->itemToWindowTransform():QTransform();
    t *= d->windowToItemTransform();
    return t.mapRect(rect);
}
 
QRectF QQuickItem::mapRectFromScene(const QRectF &rect) const
{
    Q_D(const QQuickItem);
    return d->windowToItemTransform().mapRect(rect);
}
 
bool QQuickItem::event(QEvent *ev)
{
    Q_D(QQuickItem);
 
    switch (ev->type()) {
#if QT_CONFIG(im)
    case QEvent::InputMethodQuery: {
        QInputMethodQueryEvent *query = static_cast<QInputMethodQueryEvent *>(ev);
        Qt::InputMethodQueries queries = query->queries();
        for (uint i = 0; i < 32; ++i) {
            Qt::InputMethodQuery q = (Qt::InputMethodQuery)(int)(queries & (1<<i));
            if (q) {
                QVariant v = inputMethodQuery(q);
                query->setValue(q, v);
            }
        }
        query->accept();
        break;
    }
    case QEvent::InputMethod:
        inputMethodEvent(static_cast<QInputMethodEvent *>(ev));
        break;
#endif // im
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
    case QEvent::TouchCancel:
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
#if QT_CONFIG(wheelevent)
    case QEvent::Wheel:
#endif
        d->deliverPointerEvent(ev);
    break;
    case QEvent::StyleAnimationUpdate:
        if (isVisible()) {
            ev->accept();
            update();
        }
        break;
    case QEvent::HoverEnter:
        hoverEnterEvent(static_cast<QHoverEvent*>(ev));
        break;
    case QEvent::HoverLeave:
        hoverLeaveEvent(static_cast<QHoverEvent*>(ev));
        break;
    case QEvent::HoverMove:
        hoverMoveEvent(static_cast<QHoverEvent*>(ev));
        break;
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
        d->deliverKeyEvent(static_cast<QKeyEvent*>(ev));
        break;
    case QEvent::ShortcutOverride:
        d->deliverShortcutOverrideEvent(static_cast<QKeyEvent*>(ev));
        break;
    case QEvent::FocusIn:
        focusInEvent(static_cast<QFocusEvent*>(ev));
        break;
    case QEvent::FocusOut:
        focusOutEvent(static_cast<QFocusEvent*>(ev));
        break;
    case QEvent::MouseMove:
        mouseMoveEvent(static_cast<QMouseEvent*>(ev));
        break;
#if QT_CONFIG(quick_draganddrop)
    case QEvent::DragEnter:
        dragEnterEvent(static_cast<QDragEnterEvent*>(ev));
        break;
    case QEvent::DragLeave:
        dragLeaveEvent(static_cast<QDragLeaveEvent*>(ev));
        break;
    case QEvent::DragMove:
        dragMoveEvent(static_cast<QDragMoveEvent*>(ev));
        break;
    case QEvent::Drop:
        dropEvent(static_cast<QDropEvent*>(ev));
        break;
#endif // quick_draganddrop
#if QT_CONFIG(gestures)
    case QEvent::NativeGesture:
        ev->ignore();
        break;
#endif // gestures
    case QEvent::LanguageChange:
    case QEvent::LocaleChange:
        for (QQuickItem *item : std::as_const(d->childItems))
            QCoreApplication::sendEvent(item, ev);
        break;
    case QEvent::WindowActivate:
    case QEvent::WindowDeactivate:
        if (d->providesPalette())
            d->setCurrentColorGroup();
        for (QQuickItem *item : std::as_const(d->childItems))
            QCoreApplication::sendEvent(item, ev);
        break;
    case QEvent::ApplicationPaletteChange:
        for (QQuickItem *item : std::as_const(d->childItems))
            QCoreApplication::sendEvent(item, ev);
        break;
    default:
        return QObject::event(ev);
    }
 
    return true;
}
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug debug,
#if QT_VERSION >= QT_VERSION_CHECK(7, 0, 0)
                  const
#endif
                  QQuickItem *item)
{
    QDebugStateSaver saver(debug);
    debug.nospace();
    if (!item) {
        debug << "QQuickItem(nullptr)";
        return debug;
    }
 
    const QRectF rect(item->position(), QSizeF(item->width(), item->height()));
 
    debug << item->metaObject()->className() << '(' << static_cast<void *>(item);
 
    // Deferred properties will cause recursion when calling nameForObject
    // before the component is completed, so guard against this situation.
    if (item->isComponentComplete()) {
        if (QQmlContext *context = qmlContext(item)) {
            const auto objectId = context->nameForObject(item);
            if (!objectId.isEmpty())
                debug << ", id=" << objectId;
        }
    }
    if (!item->objectName().isEmpty())
        debug << ", name=" << item->objectName();
    debug << ", parent=" << static_cast<void *>(item->parentItem())
          << ", geometry=";
    QtDebugUtils::formatQRect(debug, rect);
    if (const qreal z = item->z())
        debug << ", z=" << z;
    if (item->flags().testFlag(QQuickItem::ItemIsViewport))
        debug << " \U0001f5bc"; // frame with picture
    if (item->flags().testFlag(QQuickItem::ItemObservesViewport))
        debug << " \u23ff"; // observer eye
    debug << ')';
    return debug;
}
#endif // QT_NO_DEBUG_STREAM
 
bool QQuickItem::isTextureProvider() const
{
#if QT_CONFIG(quick_shadereffect)
    Q_D(const QQuickItem);
    return d->extra.isAllocated() && d->extra->layer && d->extra->layer->effectSource() ?
           d->extra->layer->effectSource()->isTextureProvider() : false;
#else
    return false;
#endif
}
 
QSGTextureProvider *QQuickItem::textureProvider() const
{
#if QT_CONFIG(quick_shadereffect)
    Q_D(const QQuickItem);
    return d->extra.isAllocated() && d->extra->layer && d->extra->layer->effectSource() ?
           d->extra->layer->effectSource()->textureProvider() : nullptr;
#else
    return 0;
#endif
}
 
#if QT_CONFIG(quick_shadereffect)
QQuickItemLayer *QQuickItemPrivate::layer() const
{
    if (!extra.isAllocated() || !extra->layer) {
        extra.value().layer = new QQuickItemLayer(const_cast<QQuickItem *>(q_func()));
        if (!componentComplete)
            extra->layer->classBegin();
    }
    return extra->layer;
}
#endif
 
void QQuickItemPrivate::localizedTouchEvent(const QTouchEvent *event, bool isFiltering, QMutableTouchEvent *localized)
{
    Q_Q(QQuickItem);
    QList<QEventPoint> touchPoints;
    QEventPoint::States eventStates;
 
    bool anyPressOrReleaseInside = false;
    bool anyGrabber = false;
    for (auto &p : event->points()) {
        if (p.isAccepted())
            continue;
 
        // include points where item is the grabber, or if any of its handlers is the grabber while some parent is filtering
        auto pointGrabber = event->exclusiveGrabber(p);
        bool isGrabber = (pointGrabber == q);
        if (!isGrabber && pointGrabber && isFiltering) {
            auto handlerGrabber = qmlobject_cast<QQuickPointerHandler *>(pointGrabber);
            if (handlerGrabber && handlerGrabber->parentItem() == q)
                isGrabber = true;
        }
        if (isGrabber)
            anyGrabber = true;
 
        // include points inside the bounds if no other item is the grabber or if the item is filtering
        const auto localPos = q->mapFromScene(p.scenePosition());
        bool isInside = q->contains(localPos);
        bool hasAnotherGrabber = pointGrabber && pointGrabber != q;
        // if there's no exclusive grabber, look for passive grabbers during filtering
        if (isFiltering && !pointGrabber) {
            const auto pg = event->passiveGrabbers(p);
            if (!pg.isEmpty()) {
                // It seems unlikely to have multiple passive grabbers of one eventpoint with different grandparents.
                // So hopefully if we start from one passive grabber and go up the parent chain from there,
                // we will find any filtering parent items that exist.
                auto handler = qmlobject_cast<QQuickPointerHandler *>(pg.constFirst());
                if (handler)
                    pointGrabber = handler->parentItem();
            }
        }
 
        // filtering: (childMouseEventFilter) include points that are grabbed by children of the target item
        bool grabberIsChild = false;
        auto parent = qobject_cast<QQuickItem*>(pointGrabber);
        while (isFiltering && parent) {
            if (parent == q) {
                grabberIsChild = true;
                break;
            }
            parent = parent->parentItem();
        }
 
        bool filterRelevant = isFiltering && grabberIsChild;
        if (!(isGrabber || (isInside && (!hasAnotherGrabber || isFiltering)) || filterRelevant))
            continue;
        if ((p.state() == QEventPoint::State::Pressed || p.state() == QEventPoint::State::Released) && isInside)
            anyPressOrReleaseInside = true;
        QEventPoint pCopy(p);
        eventStates |= p.state();
        if (p.state() == QEventPoint::State::Released)
            QMutableEventPoint::detach(pCopy);
        QMutableEventPoint::setPosition(pCopy, localPos);
        touchPoints.append(std::move(pCopy));
    }
 
    // Now touchPoints will have only points which are inside the item.
    // But if none of them were just pressed inside, and the item has no other reason to care, ignore them anyway.
    if (touchPoints.isEmpty() || (!anyPressOrReleaseInside && !anyGrabber && !isFiltering)) {
        *localized = QMutableTouchEvent(QEvent::None);
        return;
    }
 
    // if all points have the same state, set the event type accordingly
    QEvent::Type eventType = event->type();
    switch (eventStates) {
    case QEventPoint::State::Pressed:
        eventType = QEvent::TouchBegin;
        break;
    case QEventPoint::State::Released:
        eventType = QEvent::TouchEnd;
        break;
    default:
        eventType = QEvent::TouchUpdate;
        break;
    }
 
    QMutableTouchEvent ret(eventType, event->pointingDevice(), event->modifiers(), touchPoints);
    ret.setTarget(q);
    ret.setTimestamp(event->timestamp());
    ret.accept();
    *localized = ret;
}
 
bool QQuickItemPrivate::hasPointerHandlers() const
{
    return extra.isAllocated() && !extra->pointerHandlers.isEmpty();
}
 
bool QQuickItemPrivate::hasEnabledHoverHandlers() const
{
    if (!hasPointerHandlers())
        return false;
    for (QQuickPointerHandler *h : extra->pointerHandlers)
        if (auto *hh = qmlobject_cast<QQuickHoverHandler *>(h); hh && hh->enabled())
            return true;
    return false;
}
 
void QQuickItemPrivate::addPointerHandler(QQuickPointerHandler *h)
{
    Q_ASSERT(h);
    Q_Q(QQuickItem);
    // Accept all buttons, and leave filtering to pointerEvent() and/or user JS,
    // because there can be multiple handlers...
    extra.value().acceptedMouseButtons = Qt::AllButtons;
    auto &handlers = extra.value().pointerHandlers;
    if (!handlers.contains(h))
        handlers.prepend(h);
    auto &res = extra.value().resourcesList;
    if (!res.contains(h)) {
        res.append(h);
        QObject::connect(h, &QObject::destroyed, q, [this](QObject *o) {
            _q_resourceObjectDeleted(o);
        });
    }
}
 
void QQuickItemPrivate::removePointerHandler(QQuickPointerHandler *h)
{
    Q_ASSERT(h);
    Q_Q(QQuickItem);
    auto &handlers = extra.value().pointerHandlers;
    handlers.removeOne(h);
    auto &res = extra.value().resourcesList;
    res.removeOne(h);
    QObject::disconnect(h, &QObject::destroyed, q, nullptr);
    if (handlers.isEmpty())
        extra.value().acceptedMouseButtons = extra.value().acceptedMouseButtonsWithoutHandlers;
}
 
#if QT_CONFIG(quick_shadereffect)
QQuickItemLayer::QQuickItemLayer(QQuickItem *item)
    : m_item(item)
    , m_enabled(false)
    , m_mipmap(false)
    , m_smooth(false)
    , m_live(true)
    , m_componentComplete(true)
    , m_wrapMode(QQuickShaderEffectSource::ClampToEdge)
    , m_format(QQuickShaderEffectSource::RGBA8)
    , m_name("source")
    , m_effectComponent(nullptr)
    , m_effect(nullptr)
    , m_effectSource(nullptr)
    , m_textureMirroring(QQuickShaderEffectSource::MirrorVertically)
    , m_samples(0)
{
}
 
QQuickItemLayer::~QQuickItemLayer()
{
    delete m_effectSource;
    delete m_effect;
}
 
void QQuickItemLayer::setEnabled(bool e)
{
    if (e == m_enabled)
        return;
    m_enabled = e;
    if (m_componentComplete) {
        if (m_enabled)
            activate();
        else
            deactivate();
    }
 
    emit enabledChanged(e);
}
 
void QQuickItemLayer::classBegin()
{
    Q_ASSERT(!m_effectSource);
    Q_ASSERT(!m_effect);
    m_componentComplete = false;
}
 
void QQuickItemLayer::componentComplete()
{
    Q_ASSERT(!m_componentComplete);
    m_componentComplete = true;
    if (m_enabled)
        activate();
}
 
void QQuickItemLayer::activate()
{
    Q_ASSERT(!m_effectSource);
    m_effectSource = new QQuickShaderEffectSource();
    QQuickItemPrivate::get(m_effectSource)->setTransparentForPositioner(true);
 
    QQuickItem *parentItem = m_item->parentItem();
    if (parentItem) {
        m_effectSource->setParentItem(parentItem);
        m_effectSource->stackAfter(m_item);
    }
 
    m_effectSource->setSourceItem(m_item);
    m_effectSource->setHideSource(true);
    m_effectSource->setSmooth(m_smooth);
    m_effectSource->setLive(m_live);
    m_effectSource->setTextureSize(m_size);
    m_effectSource->setSourceRect(m_sourceRect);
    m_effectSource->setMipmap(m_mipmap);
    m_effectSource->setWrapMode(m_wrapMode);
    m_effectSource->setFormat(m_format);
    m_effectSource->setTextureMirroring(m_textureMirroring);
    m_effectSource->setSamples(m_samples);
 
    if (m_effectComponent)
        activateEffect();
 
    m_effectSource->setVisible(m_item->isVisible() && !m_effect);
 
    updateZ();
    updateGeometry();
    updateOpacity();
    updateMatrix();
 
    QQuickItemPrivate *id = QQuickItemPrivate::get(m_item);
    id->addItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Opacity | QQuickItemPrivate::Parent | QQuickItemPrivate::Visibility | QQuickItemPrivate::SiblingOrder);
}
 
void QQuickItemLayer::deactivate()
{
    Q_ASSERT(m_effectSource);
 
    if (m_effectComponent)
        deactivateEffect();
 
    delete m_effectSource;
    m_effectSource = nullptr;
 
    QQuickItemPrivate *id = QQuickItemPrivate::get(m_item);
    id->removeItemChangeListener(this,  QQuickItemPrivate::Geometry | QQuickItemPrivate::Opacity | QQuickItemPrivate::Parent | QQuickItemPrivate::Visibility | QQuickItemPrivate::SiblingOrder);
}
 
void QQuickItemLayer::activateEffect()
{
    Q_ASSERT(m_effectSource);
    Q_ASSERT(m_effectComponent);
    Q_ASSERT(!m_effect);
 
    QObject *created = m_effectComponent->beginCreate(m_effectComponent->creationContext());
    m_effect = qobject_cast<QQuickItem *>(created);
    if (!m_effect) {
        qWarning("Item: layer.effect is not a QML Item.");
        m_effectComponent->completeCreate();
        delete created;
        return;
    }
    QQuickItem *parentItem = m_item->parentItem();
    if (parentItem) {
        m_effect->setParentItem(parentItem);
        m_effect->stackAfter(m_effectSource);
    }
    m_effect->setVisible(m_item->isVisible());
    m_effect->setProperty(m_name, QVariant::fromValue<QObject *>(m_effectSource));
    QQuickItemPrivate::get(m_effect)->setTransparentForPositioner(true);
    m_effectComponent->completeCreate();
}
 
void QQuickItemLayer::deactivateEffect()
{
    Q_ASSERT(m_effectSource);
    Q_ASSERT(m_effectComponent);
 
    delete m_effect;
    m_effect = nullptr;
}
 
 
void QQuickItemLayer::setEffect(QQmlComponent *component)
{
    if (component == m_effectComponent)
        return;
 
    bool updateNeeded = false;
    if (m_effectSource && m_effectComponent) {
        deactivateEffect();
        updateNeeded = true;
    }
 
    m_effectComponent = component;
 
    if (m_effectSource && m_effectComponent) {
        activateEffect();
        updateNeeded = true;
    }
 
    if (updateNeeded) {
        updateZ();
        updateGeometry();
        updateOpacity();
        updateMatrix();
        m_effectSource->setVisible(m_item->isVisible() && !m_effect);
    }
 
    emit effectChanged(component);
}
 
 
void QQuickItemLayer::setMipmap(bool mipmap)
{
    if (mipmap == m_mipmap)
        return;
    m_mipmap = mipmap;
 
    if (m_effectSource)
        m_effectSource->setMipmap(m_mipmap);
 
    emit mipmapChanged(mipmap);
}
 
 
void QQuickItemLayer::setFormat(QQuickShaderEffectSource::Format f)
{
    if (f == m_format)
        return;
    m_format = f;
 
    if (m_effectSource)
        m_effectSource->setFormat(m_format);
 
    emit formatChanged(m_format);
}
 
 
void QQuickItemLayer::setSourceRect(const QRectF &sourceRect)
{
    if (sourceRect == m_sourceRect)
        return;
    m_sourceRect = sourceRect;
 
    if (m_effectSource)
        m_effectSource->setSourceRect(m_sourceRect);
 
    emit sourceRectChanged(sourceRect);
}
 
void QQuickItemLayer::setSmooth(bool s)
{
    if (m_smooth == s)
        return;
    m_smooth = s;
 
    if (m_effectSource)
        m_effectSource->setSmooth(m_smooth);
 
    emit smoothChanged(s);
}
 
void QQuickItemLayer::setLive(bool live)
{
    if (m_live == live)
        return;
    m_live = live;
 
    if (m_effectSource)
        m_effectSource->setLive(m_live);
 
    emit liveChanged(live);
}
 
void QQuickItemLayer::setSize(const QSize &size)
{
    if (size == m_size)
        return;
    m_size = size;
 
    if (m_effectSource)
        m_effectSource->setTextureSize(size);
 
    emit sizeChanged(size);
}
 
void QQuickItemLayer::setWrapMode(QQuickShaderEffectSource::WrapMode mode)
{
    if (mode == m_wrapMode)
        return;
    m_wrapMode = mode;
 
    if (m_effectSource)
        m_effectSource->setWrapMode(m_wrapMode);
 
    emit wrapModeChanged(mode);
}
 
void QQuickItemLayer::setTextureMirroring(QQuickShaderEffectSource::TextureMirroring mirroring)
{
    if (mirroring == m_textureMirroring)
        return;
    m_textureMirroring = mirroring;
 
    if (m_effectSource)
        m_effectSource->setTextureMirroring(m_textureMirroring);
 
    emit textureMirroringChanged(mirroring);
}
 
void QQuickItemLayer::setSamples(int count)
{
    if (m_samples == count)
        return;
 
    m_samples = count;
 
    if (m_effectSource)
        m_effectSource->setSamples(m_samples);
 
    emit samplesChanged(count);
}
 
void QQuickItemLayer::setName(const QByteArray &name) {
    if (m_name == name)
        return;
    if (m_effect) {
        m_effect->setProperty(m_name, QVariant());
        m_effect->setProperty(name, QVariant::fromValue<QObject *>(m_effectSource));
    }
    m_name = name;
    emit nameChanged(name);
}
 
void QQuickItemLayer::itemOpacityChanged(QQuickItem *item)
{
    Q_UNUSED(item);
    updateOpacity();
}
 
void QQuickItemLayer::itemGeometryChanged(QQuickItem *, QQuickGeometryChange, const QRectF &)
{
    updateGeometry();
}
 
void QQuickItemLayer::itemParentChanged(QQuickItem *item, QQuickItem *parent)
{
    Q_UNUSED(item);
    Q_ASSERT(item == m_item);
    Q_ASSERT(parent != m_effectSource);
    Q_ASSERT(parent == nullptr || parent != m_effect);
 
    m_effectSource->setParentItem(parent);
    if (parent)
        m_effectSource->stackAfter(m_item);
 
    if (m_effect) {
        m_effect->setParentItem(parent);
        if (parent)
            m_effect->stackAfter(m_effectSource);
    }
}
 
void QQuickItemLayer::itemSiblingOrderChanged(QQuickItem *)
{
    m_effectSource->stackAfter(m_item);
    if (m_effect)
        m_effect->stackAfter(m_effectSource);
}
 
void QQuickItemLayer::itemVisibilityChanged(QQuickItem *)
{
    QQuickItem *l = m_effect ? (QQuickItem *) m_effect : (QQuickItem *) m_effectSource;
    if (!l)
        return;
    l->setVisible(m_item->isVisible());
}
 
void QQuickItemLayer::updateZ()
{
    if (!m_componentComplete || !m_enabled)
        return;
    QQuickItem *l = m_effect ? (QQuickItem *) m_effect : (QQuickItem *) m_effectSource;
    if (!l)
        return;
    l->setZ(m_item->z());
}
 
void QQuickItemLayer::updateOpacity()
{
    QQuickItem *l = m_effect ? (QQuickItem *) m_effect : (QQuickItem *) m_effectSource;
    if (!l)
        return;
    l->setOpacity(m_item->opacity());
}
 
void QQuickItemLayer::updateGeometry()
{
    QQuickItem *l = m_effect ? (QQuickItem *) m_effect : (QQuickItem *) m_effectSource;
    if (!l)
        return;
    // Avoid calling QQuickImage::boundingRect() or other overrides
    // which may not be up-to-date at this time (QTBUG-104442, 104536)
    QRectF bounds = m_item->QQuickItem::boundingRect();
    l->setSize(bounds.size());
    l->setPosition(bounds.topLeft() + m_item->position());
}
 
void QQuickItemLayer::updateMatrix()
{
    // Called directly from transformChanged(), so needs some extra
    // checks.
    if (!m_componentComplete || !m_enabled)
        return;
    QQuickItem *l = m_effect ? (QQuickItem *) m_effect : (QQuickItem *) m_effectSource;
    if (!l)
        return;
    QQuickItemPrivate *ld = QQuickItemPrivate::get(l);
    l->setScale(m_item->scale());
    l->setRotation(m_item->rotation());
    ld->transforms = QQuickItemPrivate::get(m_item)->transforms;
    if (ld->origin() != QQuickItemPrivate::get(m_item)->origin())
        ld->extra.value().origin = QQuickItemPrivate::get(m_item)->origin();
    ld->dirty(QQuickItemPrivate::Transform);
}
#endif // quick_shadereffect
 
QQuickItemPrivate::ExtraData::ExtraData()
: z(0), scale(1), rotation(0), opacity(1),
  contents(nullptr), screenAttached(nullptr), layoutDirectionAttached(nullptr),
  enterKeyAttached(nullptr),
  keyHandler(nullptr),
#if QT_CONFIG(quick_shadereffect)
  layer(nullptr),
#endif
  effectRefCount(0), hideRefCount(0),
  recursiveEffectRefCount(0),
  opacityNode(nullptr), clipNode(nullptr), rootNode(nullptr),
  origin(QQuickItem::Center),
  transparentForPositioner(false)
{
}
 
 
#if QT_CONFIG(accessibility)
QAccessible::Role QQuickItemPrivate::effectiveAccessibleRole() const
{
    Q_Q(const QQuickItem);
    auto *attached = qmlAttachedPropertiesObject<QQuickAccessibleAttached>(q, false);
    auto role = QAccessible::NoRole;
    if (auto *accessibleAttached = qobject_cast<QQuickAccessibleAttached *>(attached))
        role = accessibleAttached->role();
    if (role == QAccessible::NoRole)
        role = accessibleRole();
    return role;
}
 
QAccessible::Role QQuickItemPrivate::accessibleRole() const
{
    return QAccessible::NoRole;
}
#endif
 
// helper code to let a visual parent mark its visual children for the garbage collector
 
namespace QV4 {
namespace Heap {
struct QQuickItemWrapper : public QObjectWrapper {
    static void markObjects(QV4::Heap::Base *that, QV4::MarkStack *markStack);
};
}
}
 
struct QQuickItemWrapper : public QV4::QObjectWrapper {
    V4_OBJECT2(QQuickItemWrapper, QV4::QObjectWrapper)
};
 
DEFINE_OBJECT_VTABLE(QQuickItemWrapper);
 
void QV4::Heap::QQuickItemWrapper::markObjects(QV4::Heap::Base *that, QV4::MarkStack *markStack)
{
    QObjectWrapper *This = static_cast<QObjectWrapper *>(that);
    if (QQuickItem *item = static_cast<QQuickItem*>(This->object())) {
        for (QQuickItem *child : std::as_const(QQuickItemPrivate::get(item)->childItems))
            QV4::QObjectWrapper::markWrapper(child, markStack);
    }
    QObjectWrapper::markObjects(that, markStack);
}
 
quint64 QQuickItemPrivate::_q_createJSWrapper(QQmlV4ExecutionEnginePtr engine)
{
    return (engine->memoryManager->allocate<QQuickItemWrapper>(q_func()))->asReturnedValue();
}
 
QDebug operator<<(QDebug debug, const QQuickItemPrivate::ChangeListener &listener)
{
   QDebugStateSaver stateSaver(debug);
   debug.nospace() << "ChangeListener listener=" << listener.listener << " types=" << listener.types;
   return debug;
}
 
QPointF QQuickItem::mapFromItem(const QQuickItem *item, qreal x, qreal y)
{ return mapFromItem(item, QPointF(x, y) ); }
 
QRectF QQuickItem::mapFromItem(const QQuickItem *item, const QRectF &rect) const
{ return mapRectFromItem(item, rect); }
 
QRectF QQuickItem::mapFromItem(const QQuickItem *item, qreal x, qreal y, qreal width, qreal height) const
{ return mapFromItem(item, QRectF(x, y, width, height)); }
 
QPointF QQuickItem::mapToItem(const QQuickItem *item, qreal x, qreal y)
{ return mapToItem(item, QPoint(x, y)); }
 
QRectF QQuickItem::mapToItem(const QQuickItem *item, const QRectF &rect) const
{ return mapRectToItem(item, rect); }
 
QRectF QQuickItem::mapToItem(const QQuickItem *item, qreal x, qreal y, qreal width, qreal height) const
{ return mapToItem(item, QRectF(x, y, width, height)); }
 
QPointF QQuickItem::mapToGlobal(qreal x, qreal y) const
{ return mapToGlobal(QPointF(x, y)); }
 
QPointF QQuickItem::mapFromGlobal(qreal x, qreal y) const
{ return mapFromGlobal(QPointF(x, y)); }
 
QQuickItemChangeListener::~QQuickItemChangeListener() = default;
 
QT_END_NAMESPACE
 
#include <moc_qquickitem.cpp>
 
#include "moc_qquickitem_p.cpp"