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****************************************************************************/
#include "qwindowsysteminterface.h"
#include <qpa/qplatformwindow.h>
#include "qwindowsysteminterface_p.h"
#include "private/qguiapplication_p.h"
#include "private/qevent_p.h"
#include "private/qtouchdevice_p.h"
#include <QAbstractEventDispatcher>
#include <qpa/qplatformdrag.h>
#include <qpa/qplatformintegration.h>
#include <qdebug.h>
#include "qhighdpiscaling_p.h"
#include <QtCore/qscopedvaluerollback.h>

QT_BEGIN_NAMESPACE


QElapsedTimer QWindowSystemInterfacePrivate::eventTime;
bool QWindowSystemInterfacePrivate::synchronousWindowSystemEvents = false;
bool QWindowSystemInterfacePrivate::TabletEvent::platformSynthesizesMouse = true;
QWaitCondition QWindowSystemInterfacePrivate::eventsFlushed;
QMutex QWindowSystemInterfacePrivate::flushEventMutex;
QAtomicInt QWindowSystemInterfacePrivate::eventAccepted;
QWindowSystemEventHandler *QWindowSystemInterfacePrivate::eventHandler;

//------------------------------------------------------------
//
// Callback functions for plugins:
//

QWindowSystemInterfacePrivate::WindowSystemEventList QWindowSystemInterfacePrivate::windowSystemEventQueue;

extern QPointer<QWindow> qt_last_mouse_receiver;

/*!
    \class QWindowSystemInterface
    \since 5.0
    \internal
    \preliminary
    \ingroup qpa
    \brief The QWindowSystemInterface provides an event queue for the QPA platform.

    The platform plugins call the various functions to notify about events. The events are queued
    until sendWindowSystemEvents() is called by the event dispatcher.
*/

void QWindowSystemInterface::handleEnterEvent(QWindow *tlw, const QPointF &local, const QPointF &global)
{
    if (tlw) {
        QWindowSystemInterfacePrivate::EnterEvent *e = new QWindowSystemInterfacePrivate::EnterEvent(tlw, local, global);
        QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
    }
}

void QWindowSystemInterface::handleLeaveEvent(QWindow *tlw)
{
    QWindowSystemInterfacePrivate::LeaveEvent *e = new QWindowSystemInterfacePrivate::LeaveEvent(tlw);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

/*!
    This method can be used to ensure leave and enter events are both in queue when moving from
    one QWindow to another. This allows QWindow subclasses to check for a queued enter event
    when handling the leave event (\c QWindowSystemInterfacePrivate::peekWindowSystemEvent) to
    determine where mouse went and act accordingly. E.g. QWidgetWindow needs to know if mouse
    cursor moves between windows in same window hierarchy.
*/
void QWindowSystemInterface::handleEnterLeaveEvent(QWindow *enter, QWindow *leave, const QPointF &local, const QPointF& global)
{
    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
    if (wasSynchronous)
        setSynchronousWindowSystemEvents(false);
    handleLeaveEvent(leave);
    handleEnterEvent(enter, local, global);
    if (wasSynchronous) {
        flushWindowSystemEvents();
        setSynchronousWindowSystemEvents(true);
    }
}

void QWindowSystemInterface::handleWindowActivated(QWindow *tlw, Qt::FocusReason r)
{
    QWindowSystemInterfacePrivate::ActivatedWindowEvent *e =
        new QWindowSystemInterfacePrivate::ActivatedWindowEvent(tlw, r);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleWindowStateChanged(QWindow *tlw, Qt::WindowState newState)
{
    QWindowSystemInterfacePrivate::WindowStateChangedEvent *e =
        new QWindowSystemInterfacePrivate::WindowStateChangedEvent(tlw, newState);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleWindowScreenChanged(QWindow *tlw, QScreen *screen)
{
    QWindowSystemInterfacePrivate::WindowScreenChangedEvent *e =
        new QWindowSystemInterfacePrivate::WindowScreenChangedEvent(tlw, screen);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleApplicationStateChanged(Qt::ApplicationState newState, bool forcePropagate)
{
    Q_ASSERT(QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::ApplicationState));
    QWindowSystemInterfacePrivate::ApplicationStateChangedEvent *e =
        new QWindowSystemInterfacePrivate::ApplicationStateChangedEvent(newState, forcePropagate);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

/*!
  If \a oldRect is null, Qt will use the previously reported geometry instead.
 */
void QWindowSystemInterface::handleGeometryChange(QWindow *tlw, const QRect &newRect, const QRect &oldRect)
{
    QWindowSystemInterfacePrivate::GeometryChangeEvent *e = new QWindowSystemInterfacePrivate::GeometryChangeEvent(tlw, QHighDpi::fromNativePixels(newRect, tlw), QHighDpi::fromNativePixels(oldRect, tlw));
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleCloseEvent(QWindow *tlw, bool *accepted)
{
    if (tlw) {
        QWindowSystemInterfacePrivate::CloseEvent *e =
                new QWindowSystemInterfacePrivate::CloseEvent(tlw, accepted);
        QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
    }
}

/*!

\a w == 0 means that the event is in global coords only, \a local will be ignored in this case

*/
void QWindowSystemInterface::handleMouseEvent(QWindow *w, const QPointF & local, const QPointF & global, Qt::MouseButtons b,
                                              Qt::KeyboardModifiers mods, Qt::MouseEventSource source)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleMouseEvent(w, time, local, global, b, mods, source);
}

void QWindowSystemInterface::handleMouseEvent(QWindow *w, ulong timestamp, const QPointF & local, const QPointF & global, Qt::MouseButtons b,
                                              Qt::KeyboardModifiers mods, Qt::MouseEventSource source)
{
    QWindowSystemInterfacePrivate::MouseEvent * e =
        new QWindowSystemInterfacePrivate::MouseEvent(w, timestamp, QHighDpi::fromNativeLocalPosition(local, w), QHighDpi::fromNativePixels(global, w), b, mods, source);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleFrameStrutMouseEvent(QWindow *w, const QPointF & local, const QPointF & global, Qt::MouseButtons b,
                                                        Qt::KeyboardModifiers mods, Qt::MouseEventSource source)
{
    const unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleFrameStrutMouseEvent(w, time, local, global, b, mods, source);
}

void QWindowSystemInterface::handleFrameStrutMouseEvent(QWindow *w, ulong timestamp, const QPointF & local, const QPointF & global, Qt::MouseButtons b,
                                                        Qt::KeyboardModifiers mods, Qt::MouseEventSource source)
{
    QWindowSystemInterfacePrivate::MouseEvent * e =
            new QWindowSystemInterfacePrivate::MouseEvent(w, timestamp,
                                                          QWindowSystemInterfacePrivate::FrameStrutMouse,
                                                          QHighDpi::fromNativeLocalPosition(local, w), QHighDpi::fromNativePixels(global, w), b, mods, source);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

bool QWindowSystemInterface::handleShortcutEvent(QWindow *window, ulong timestamp, int keyCode, Qt::KeyboardModifiers modifiers, quint32 nativeScanCode,
                                      quint32 nativeVirtualKey, quint32 nativeModifiers, const QString &text, bool autorepeat, ushort count)
{
#ifndef QT_NO_SHORTCUT
    if (!window)
        window = QGuiApplication::focusWindow();

    QShortcutMap &shortcutMap = QGuiApplicationPrivate::instance()->shortcutMap;
    if (shortcutMap.state() == QKeySequence::NoMatch) {
        // Check if the shortcut is overridden by some object in the event delivery path (typically the focus object).
        // If so, we should not look up the shortcut in the shortcut map, but instead deliver the event as a regular
        // key event, so that the target that accepted the shortcut override event can handle it. Note that we only
        // do this if the shortcut map hasn't found a partial shortcut match yet. If it has, the shortcut can not be
        // overridden.
        QWindowSystemInterfacePrivate::KeyEvent *shortcutOverrideEvent = new QWindowSystemInterfacePrivate::KeyEvent(window, timestamp,
            QEvent::ShortcutOverride, keyCode, modifiers, nativeScanCode, nativeVirtualKey, nativeModifiers, text, autorepeat, count);

        {
            // FIXME: Template handleWindowSystemEvent to support both sync and async delivery
            QScopedValueRollback<bool> syncRollback(QWindowSystemInterfacePrivate::synchronousWindowSystemEvents);
            QWindowSystemInterfacePrivate::synchronousWindowSystemEvents = true;

            if (QWindowSystemInterfacePrivate::handleWindowSystemEvent(shortcutOverrideEvent))
                return false;
        }
    }

    // The shortcut event is dispatched as a QShortcutEvent, not a QKeyEvent, but we use
    // the QKeyEvent as a container for the various properties that the shortcut map needs
    // to inspect to determine if a shortcut matched the keys that were pressed.
    QKeyEvent keyEvent(QEvent::ShortcutOverride, keyCode, modifiers, nativeScanCode,
        nativeVirtualKey, nativeModifiers, text, autorepeat, count);

    return shortcutMap.tryShortcut(&keyEvent);
#else
    Q_UNUSED(window)
    Q_UNUSED(timestamp)
    Q_UNUSED(key)
    Q_UNUSED(modifiers)
    Q_UNUSED(nativeScanCode)
    Q_UNUSED(nativeVirtualKey)
    Q_UNUSED(nativeModifiers)
    Q_UNUSED(text)
    Q_UNUSED(autorepeat)
    Q_UNUSED(count)
    return false;
#endif
}


bool QWindowSystemInterface::handleKeyEvent(QWindow *w, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text, bool autorep, ushort count) {
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    return handleKeyEvent(w, time, t, k, mods, text, autorep, count);
}

bool QWindowSystemInterface::handleKeyEvent(QWindow *tlw, ulong timestamp, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text, bool autorep, ushort count)
{
#if defined(Q_OS_OSX)
    if (t == QEvent::KeyPress && QWindowSystemInterface::handleShortcutEvent(tlw, timestamp, k, mods, 0, 0, 0, text, autorep, count))
        return true;
#endif

    QWindowSystemInterfacePrivate::KeyEvent * e =
            new QWindowSystemInterfacePrivate::KeyEvent(tlw, timestamp, t, k, mods, text, autorep, count);
    return QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

bool QWindowSystemInterface::handleExtendedKeyEvent(QWindow *w, QEvent::Type type, int key, Qt::KeyboardModifiers modifiers,
                                                    quint32 nativeScanCode, quint32 nativeVirtualKey,
                                                    quint32 nativeModifiers,
                                                    const QString& text, bool autorep,
                                                    ushort count, bool tryShortcutOverride)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    return handleExtendedKeyEvent(w, time, type, key, modifiers, nativeScanCode, nativeVirtualKey, nativeModifiers,
                           text, autorep, count, tryShortcutOverride);
}

bool QWindowSystemInterface::handleExtendedKeyEvent(QWindow *tlw, ulong timestamp, QEvent::Type type, int key,
                                                    Qt::KeyboardModifiers modifiers,
                                                    quint32 nativeScanCode, quint32 nativeVirtualKey,
                                                    quint32 nativeModifiers,
                                                    const QString& text, bool autorep,
                                                    ushort count, bool tryShortcutOverride)
{
#if defined(Q_OS_OSX)
    if (tryShortcutOverride && type == QEvent::KeyPress && QWindowSystemInterface::handleShortcutEvent(tlw,
            timestamp, key, modifiers, nativeScanCode, nativeVirtualKey, nativeModifiers, text, autorep, count)) {
        return true;
    }
#else
    Q_UNUSED(tryShortcutOverride)
#endif

    QWindowSystemInterfacePrivate::KeyEvent * e =
            new QWindowSystemInterfacePrivate::KeyEvent(tlw, timestamp, type, key, modifiers,
                nativeScanCode, nativeVirtualKey, nativeModifiers, text, autorep, count);
    return QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleWheelEvent(QWindow *w, const QPointF & local, const QPointF & global, int d, Qt::Orientation o, Qt::KeyboardModifiers mods) {
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleWheelEvent(w, time, local, global, d, o, mods);
}

void QWindowSystemInterface::handleWheelEvent(QWindow *tlw, ulong timestamp, const QPointF & local, const QPointF & global, int d, Qt::Orientation o, Qt::KeyboardModifiers mods)
{
    QPoint point = (o == Qt::Vertical) ? QPoint(0, d) : QPoint(d, 0);
    handleWheelEvent(tlw, timestamp, local, global, QPoint(), point, mods);
}

void QWindowSystemInterface::handleWheelEvent(QWindow *w, const QPointF & local, const QPointF & global, QPoint pixelDelta, QPoint angleDelta, Qt::KeyboardModifiers mods, Qt::ScrollPhase phase, Qt::MouseEventSource source)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleWheelEvent(w, time, local, global, pixelDelta, angleDelta, mods, phase, source);
}

void QWindowSystemInterface::handleWheelEvent(QWindow *tlw, ulong timestamp, const QPointF & local, const QPointF & global, QPoint pixelDelta, QPoint angleDelta, Qt::KeyboardModifiers mods, Qt::ScrollPhase phase,
                                              Qt::MouseEventSource source, bool invertedScrolling)
{
    // Qt 4 sends two separate wheel events for horizontal and vertical
    // deltas. For Qt 5 we want to send the deltas in one event, but at the
    // same time preserve source and behavior compatibility with Qt 4.
    //
    // In addition high-resolution pixel-based deltas are also supported.
    // Platforms that does not support these may pass a null point here.
    // Angle deltas must always be sent in addition to pixel deltas.
    QWindowSystemInterfacePrivate::WheelEvent *e;

    // Pass Qt::ScrollBegin and Qt::ScrollEnd through
    // even if the wheel delta is null.
    if (angleDelta.isNull() && phase == Qt::ScrollUpdate)
        return;

    // Simple case: vertical deltas only:
    if (angleDelta.y() != 0 && angleDelta.x() == 0) {
        e = new QWindowSystemInterfacePrivate::WheelEvent(tlw, timestamp, QHighDpi::fromNativeLocalPosition(local, tlw), QHighDpi::fromNativePixels(global, tlw), pixelDelta, angleDelta, angleDelta.y(), Qt::Vertical,
                                                          mods, phase, source, invertedScrolling);
        QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
        return;
    }

    // Simple case: horizontal deltas only:
    if (angleDelta.y() == 0 && angleDelta.x() != 0) {
        e = new QWindowSystemInterfacePrivate::WheelEvent(tlw, timestamp, QHighDpi::fromNativeLocalPosition(local, tlw), QHighDpi::fromNativePixels(global, tlw), pixelDelta, angleDelta, angleDelta.x(), Qt::Horizontal, mods, phase, source, invertedScrolling);
        QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
        return;
    }

    // Both horizontal and vertical deltas: Send two wheel events.
    // The first event contains the Qt 5 pixel and angle delta as points,
    // and in addition the Qt 4 compatibility vertical angle delta.
    e = new QWindowSystemInterfacePrivate::WheelEvent(tlw, timestamp, QHighDpi::fromNativeLocalPosition(local, tlw), QHighDpi::fromNativePixels(global, tlw), pixelDelta, angleDelta, angleDelta.y(), Qt::Vertical, mods, phase, source, invertedScrolling);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);

    // The second event contains null pixel and angle points and the
    // Qt 4 compatibility horizontal angle delta.
    e = new QWindowSystemInterfacePrivate::WheelEvent(tlw, timestamp, QHighDpi::fromNativeLocalPosition(local, tlw), QHighDpi::fromNativePixels(global, tlw), QPoint(), QPoint(), angleDelta.x(), Qt::Horizontal, mods, phase, source, invertedScrolling);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}


QWindowSystemInterfacePrivate::ExposeEvent::ExposeEvent(QWindow *exposed, const QRegion &region)
    : WindowSystemEvent(Expose)
    , exposed(exposed)
    , isExposed(exposed && exposed->handle() ? exposed->handle()->isExposed() : false)
    , region(region)
{
}

int QWindowSystemInterfacePrivate::windowSystemEventsQueued()
{
    return windowSystemEventQueue.count();
}

QWindowSystemInterfacePrivate::WindowSystemEvent * QWindowSystemInterfacePrivate::getWindowSystemEvent()
{
    return windowSystemEventQueue.takeFirstOrReturnNull();
}

QWindowSystemInterfacePrivate::WindowSystemEvent *QWindowSystemInterfacePrivate::getNonUserInputWindowSystemEvent()
{
    return windowSystemEventQueue.takeFirstNonUserInputOrReturnNull();
}

QWindowSystemInterfacePrivate::WindowSystemEvent *QWindowSystemInterfacePrivate::peekWindowSystemEvent(EventType t)
{
    return windowSystemEventQueue.peekAtFirstOfType(t);
}

void QWindowSystemInterfacePrivate::removeWindowSystemEvent(WindowSystemEvent *event)
{
    windowSystemEventQueue.remove(event);
}

void QWindowSystemInterfacePrivate::postWindowSystemEvent(WindowSystemEvent *ev)
{
    windowSystemEventQueue.append(ev);
    QAbstractEventDispatcher *dispatcher = QGuiApplicationPrivate::qt_qpa_core_dispatcher();
    if (dispatcher)
        dispatcher->wakeUp();
}

/*!
    Handles a window system event.

    By default this function posts the event on the window system event queue and
    wakes the Gui event dispatcher. Qt Gui will then handle the event asynchonously
    at a later point. The return value is not used in asynchronous mode and will
    always be true.

    In synchronous mode Qt Gui will process the event immediately. The return value
    indicates if Qt accepted the event.

    \sa flushWindowSystemEvents(), setSynchronousWindowSystemEvents()
*/
bool QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *ev)
{
    bool accepted = true;
    if (synchronousWindowSystemEvents) {
        if (QThread::currentThread() == QGuiApplication::instance()->thread()) {
            // Process the event immediately on the current thread and return the accepted state.
            QGuiApplicationPrivate::processWindowSystemEvent(ev);
            accepted = ev->eventAccepted;
            delete ev;
        } else {
            // Post the event on the Qt main thread queue and flush the queue.
            // This will wake up the Gui thread which will process the event.
            // Return the accepted state for the last event on the queue,
            // which is the event posted by this function.
            postWindowSystemEvent(ev);
            accepted = QWindowSystemInterface::flushWindowSystemEvents();
        }
    } else {
        postWindowSystemEvent(ev);
    }
    return accepted;
}

void QWindowSystemInterface::registerTouchDevice(const QTouchDevice *device)
{
    QTouchDevicePrivate::registerDevice(device);
}

void QWindowSystemInterface::unregisterTouchDevice(const QTouchDevice *device)
{
    QTouchDevicePrivate::unregisterDevice(device);
}

void QWindowSystemInterface::handleTouchEvent(QWindow *w, QTouchDevice *device,
                                              const QList<TouchPoint> &points, Qt::KeyboardModifiers mods)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleTouchEvent(w, time, device, points, mods);
}

QList<QTouchEvent::TouchPoint>
    QWindowSystemInterfacePrivate::fromNativeTouchPoints(const QList<QWindowSystemInterface::TouchPoint> &points,
                                                         const QWindow *window,
                                                         QEvent::Type *type)
{
    QList<QTouchEvent::TouchPoint> touchPoints;
    Qt::TouchPointStates states;
    QTouchEvent::TouchPoint p;

    touchPoints.reserve(points.count());
    QList<QWindowSystemInterface::TouchPoint>::const_iterator point = points.constBegin();
    QList<QWindowSystemInterface::TouchPoint>::const_iterator end = points.constEnd();
    while (point != end) {
        p.setId(point->id);
        if (point->uniqueId >= 0)
            p.setUniqueId(point->uniqueId);
        p.setPressure(point->pressure);
        p.setRotation(point->rotation);
        states |= point->state;
        p.setState(point->state);

        const QPointF screenPos = point->area.center();
        p.setScreenPos(QHighDpi::fromNativePixels(screenPos, window));
        p.setScreenRect(QHighDpi::fromNativePixels(point->area, window));

        // The local pos and rect are not set, they will be calculated
        // when the event gets processed by QGuiApplication.

        p.setNormalizedPos(QHighDpi::fromNativePixels(point->normalPosition, window));
        p.setVelocity(QHighDpi::fromNativePixels(point->velocity, window));
        p.setFlags(point->flags);
        p.setRawScreenPositions(QHighDpi::fromNativePixels(point->rawPositions, window));

        touchPoints.append(p);
        ++point;
    }

    // Determine the event type based on the combined point states.
    if (type) {
        *type = QEvent::TouchUpdate;
        if (states == Qt::TouchPointPressed)
            *type = QEvent::TouchBegin;
        else if (states == Qt::TouchPointReleased)
            *type = QEvent::TouchEnd;
    }

    return touchPoints;
}

QList<QWindowSystemInterface::TouchPoint>
    QWindowSystemInterfacePrivate::toNativeTouchPoints(const QList<QTouchEvent::TouchPoint>& pointList,
                                                       const QWindow *window)
{
    QList<QWindowSystemInterface::TouchPoint> newList;
    newList.reserve(pointList.size());
    for (const QTouchEvent::TouchPoint &pt : pointList) {
        QWindowSystemInterface::TouchPoint p;
        p.id = pt.id();
        p.flags = pt.flags();
        p.normalPosition = QHighDpi::toNativeLocalPosition(pt.normalizedPos(), window);
        p.area = QHighDpi::toNativePixels(pt.screenRect(), window);
        p.pressure = pt.pressure();
        p.state = pt.state();
        p.velocity = pt.velocity();
        p.rawPositions = pt.rawScreenPositions();
        newList.append(p);
    }
    return newList;
}

void QWindowSystemInterface::handleTouchEvent(QWindow *tlw, ulong timestamp, QTouchDevice *device,
                                              const QList<TouchPoint> &points, Qt::KeyboardModifiers mods)
{
    if (!points.size()) // Touch events must have at least one point
        return;

    if (!QTouchDevicePrivate::isRegistered(device)) // Disallow passing bogus, non-registered devices.
        return;

    QEvent::Type type;
    QList<QTouchEvent::TouchPoint> touchPoints = QWindowSystemInterfacePrivate::fromNativeTouchPoints(points, tlw, &type);

    QWindowSystemInterfacePrivate::TouchEvent *e =
            new QWindowSystemInterfacePrivate::TouchEvent(tlw, timestamp, type, device, touchPoints, mods);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleTouchCancelEvent(QWindow *w, QTouchDevice *device,
                                                    Qt::KeyboardModifiers mods)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleTouchCancelEvent(w, time, device, mods);
}

void QWindowSystemInterface::handleTouchCancelEvent(QWindow *w, ulong timestamp, QTouchDevice *device,
                                                    Qt::KeyboardModifiers mods)
{
    QWindowSystemInterfacePrivate::TouchEvent *e =
            new QWindowSystemInterfacePrivate::TouchEvent(w, timestamp, QEvent::TouchCancel, device,
                                                         QList<QTouchEvent::TouchPoint>(), mods);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenOrientationChange(QScreen *screen, Qt::ScreenOrientation orientation)
{
    QWindowSystemInterfacePrivate::ScreenOrientationEvent *e =
            new QWindowSystemInterfacePrivate::ScreenOrientationEvent(screen, orientation);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenGeometryChange(QScreen *screen, const QRect &geometry, const QRect &availableGeometry)
{
    QWindowSystemInterfacePrivate::ScreenGeometryEvent *e =
        new QWindowSystemInterfacePrivate::ScreenGeometryEvent(screen, QHighDpi::fromNativeScreenGeometry(geometry, screen), QHighDpi::fromNative(availableGeometry, screen, geometry.topLeft()));
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(QScreen *screen, qreal dpiX, qreal dpiY)
{
    QWindowSystemInterfacePrivate::ScreenLogicalDotsPerInchEvent *e =
            new QWindowSystemInterfacePrivate::ScreenLogicalDotsPerInchEvent(screen, dpiX, dpiY); // ### tja
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenRefreshRateChange(QScreen *screen, qreal newRefreshRate)
{
    QWindowSystemInterfacePrivate::ScreenRefreshRateEvent *e =
            new QWindowSystemInterfacePrivate::ScreenRefreshRateEvent(screen, newRefreshRate);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleThemeChange(QWindow *tlw)
{
    QWindowSystemInterfacePrivate::ThemeChangeEvent *e = new QWindowSystemInterfacePrivate::ThemeChangeEvent(tlw);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleExposeEvent(QWindow *tlw, const QRegion &region)
{
    QWindowSystemInterfacePrivate::ExposeEvent *e =
        new QWindowSystemInterfacePrivate::ExposeEvent(tlw, QHighDpi::fromNativeLocalExposedRegion(region, tlw));
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::deferredFlushWindowSystemEvents(QEventLoop::ProcessEventsFlags flags)
{
    Q_ASSERT(QThread::currentThread() == QGuiApplication::instance()->thread());

    QMutexLocker locker(&QWindowSystemInterfacePrivate::flushEventMutex);
    sendWindowSystemEvents(flags);
    QWindowSystemInterfacePrivate::eventsFlushed.wakeOne();
}

/*!
    Make Qt Gui process all events on the event queue immediately. Return the
    accepted state for the last event on the queue.
*/
bool QWindowSystemInterface::flushWindowSystemEvents(QEventLoop::ProcessEventsFlags flags)
{
    const int count = QWindowSystemInterfacePrivate::windowSystemEventQueue.count();
    if (!count)
        return false;
    if (!QGuiApplication::instance()) {
        qWarning().nospace()
            << "QWindowSystemInterface::flushWindowSystemEvents() invoked after "
               "QGuiApplication destruction, discarding " << count << " events.";
        QWindowSystemInterfacePrivate::windowSystemEventQueue.clear();
        return false;
    }
    if (QThread::currentThread() != QGuiApplication::instance()->thread()) {
        // Post a FlushEvents event which will trigger a call back to
        // deferredFlushWindowSystemEvents from the Gui thread.
        QMutexLocker locker(&QWindowSystemInterfacePrivate::flushEventMutex);
        QWindowSystemInterfacePrivate::FlushEventsEvent *e = new QWindowSystemInterfacePrivate::FlushEventsEvent(flags);
        QWindowSystemInterfacePrivate::postWindowSystemEvent(e);
        QWindowSystemInterfacePrivate::eventsFlushed.wait(&QWindowSystemInterfacePrivate::flushEventMutex);
    } else {
        sendWindowSystemEvents(flags);
    }
    return QWindowSystemInterfacePrivate::eventAccepted.load() > 0;
}

bool QWindowSystemInterface::sendWindowSystemEvents(QEventLoop::ProcessEventsFlags flags)
{
    int nevents = 0;

    while (QWindowSystemInterfacePrivate::windowSystemEventsQueued()) {
        QWindowSystemInterfacePrivate::WindowSystemEvent *event =
            (flags & QEventLoop::ExcludeUserInputEvents) ?
                QWindowSystemInterfacePrivate::getNonUserInputWindowSystemEvent() :
                QWindowSystemInterfacePrivate::getWindowSystemEvent();
        if (!event)
            break;

        if (QWindowSystemInterfacePrivate::eventHandler) {
            if (QWindowSystemInterfacePrivate::eventHandler->sendEvent(event))
                nevents++;
        } else {
            nevents++;
            QGuiApplicationPrivate::processWindowSystemEvent(event);
        }

        // Record the accepted state for the processed event
        // (excluding flush events). This state can then be
        // returned by flushWindowSystemEvents().
        if (event->type != QWindowSystemInterfacePrivate::FlushEvents)
            QWindowSystemInterfacePrivate::eventAccepted.store(event->eventAccepted);

        delete event;
    }

    return (nevents > 0);
}

void QWindowSystemInterfacePrivate::installWindowSystemEventHandler(QWindowSystemEventHandler *handler)
{
    if (!eventHandler)
        eventHandler = handler;
}

void QWindowSystemInterfacePrivate::removeWindowSystemEventhandler(QWindowSystemEventHandler *handler)
{
    if (eventHandler == handler)
        eventHandler = 0;
}

void QWindowSystemInterface::setSynchronousWindowSystemEvents(bool enable)
{
    QWindowSystemInterfacePrivate::synchronousWindowSystemEvents = enable;
}

int QWindowSystemInterface::windowSystemEventsQueued()
{
    return QWindowSystemInterfacePrivate::windowSystemEventsQueued();
}

#ifndef QT_NO_DRAGANDDROP
QPlatformDragQtResponse QWindowSystemInterface::handleDrag(QWindow *w, const QMimeData *dropData, const QPoint &p, Qt::DropActions supportedActions)
{
    return QGuiApplicationPrivate::processDrag(w, dropData, QHighDpi::fromNativeLocalPosition(p, w) ,supportedActions);
}

QPlatformDropQtResponse QWindowSystemInterface::handleDrop(QWindow *w, const QMimeData *dropData, const QPoint &p, Qt::DropActions supportedActions)
{
    return QGuiApplicationPrivate::processDrop(w, dropData, QHighDpi::fromNativeLocalPosition(p, w),supportedActions);
}
#endif // QT_NO_DRAGANDDROP

/*!
    \fn static QWindowSystemInterface::handleNativeEvent(QWindow *window, const QByteArray &eventType, void *message, long *result)
    \brief Passes a native event identified by \a eventType to the \a window.

    \note This function can only be called from the GUI thread.
*/

bool QWindowSystemInterface::handleNativeEvent(QWindow *window, const QByteArray &eventType, void *message, long *result)
{
    return QGuiApplicationPrivate::processNativeEvent(window, eventType, message, result);
}

void QWindowSystemInterface::handleFileOpenEvent(const QString& fileName)
{
    QWindowSystemInterfacePrivate::FileOpenEvent e(fileName);
    QGuiApplicationPrivate::processWindowSystemEvent(&e);
}

void QWindowSystemInterface::handleFileOpenEvent(const QUrl &url)
{
    QWindowSystemInterfacePrivate::FileOpenEvent e(url);
    QGuiApplicationPrivate::processWindowSystemEvent(&e);
}

void QWindowSystemInterface::handleTabletEvent(QWindow *w, ulong timestamp, const QPointF &local, const QPointF &global,
                                               int device, int pointerType, Qt::MouseButtons buttons, qreal pressure, int xTilt, int yTilt,
                                               qreal tangentialPressure, qreal rotation, int z, qint64 uid,
                                               Qt::KeyboardModifiers modifiers)
{
    QWindowSystemInterfacePrivate::TabletEvent *e =
        new QWindowSystemInterfacePrivate::TabletEvent(w,timestamp,
                                                       QHighDpi::fromNativeLocalPosition(local, w),
                                                       QHighDpi::fromNativePixels(global, w),
                                                       device, pointerType, buttons, pressure,
                                                       xTilt, yTilt, tangentialPressure, rotation, z, uid, modifiers);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleTabletEvent(QWindow *w, const QPointF &local, const QPointF &global,
                                               int device, int pointerType, Qt::MouseButtons buttons, qreal pressure, int xTilt, int yTilt,
                                               qreal tangentialPressure, qreal rotation, int z, qint64 uid,
                                               Qt::KeyboardModifiers modifiers)
{
    ulong time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleTabletEvent(w, time, local, global, device, pointerType, buttons, pressure,
                      xTilt, yTilt, tangentialPressure, rotation, z, uid, modifiers);
}

void QWindowSystemInterface::handleTabletEvent(QWindow *w, ulong timestamp, bool down, const QPointF &local, const QPointF &global,
                                               int device, int pointerType, qreal pressure, int xTilt, int yTilt,
                                               qreal tangentialPressure, qreal rotation, int z, qint64 uid,
                                               Qt::KeyboardModifiers modifiers)
{
    handleTabletEvent(w, timestamp, local, global, device, pointerType, (down ? Qt::LeftButton : Qt::NoButton), pressure,
                      xTilt, yTilt, tangentialPressure, rotation, z, uid, modifiers);
}

void QWindowSystemInterface::handleTabletEvent(QWindow *w, bool down, const QPointF &local, const QPointF &global,
                                               int device, int pointerType, qreal pressure, int xTilt, int yTilt,
                                               qreal tangentialPressure, qreal rotation, int z, qint64 uid,
                                               Qt::KeyboardModifiers modifiers)
{
    handleTabletEvent(w, local, global, device, pointerType, (down ? Qt::LeftButton : Qt::NoButton), pressure,
                      xTilt, yTilt, tangentialPressure, rotation, z, uid, modifiers);
}

void QWindowSystemInterface::handleTabletEnterProximityEvent(ulong timestamp, int device, int pointerType, qint64 uid)
{
    QWindowSystemInterfacePrivate::TabletEnterProximityEvent *e =
            new QWindowSystemInterfacePrivate::TabletEnterProximityEvent(timestamp, device, pointerType, uid);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleTabletEnterProximityEvent(int device, int pointerType, qint64 uid)
{
    ulong time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleTabletEnterProximityEvent(time, device, pointerType, uid);
}

void QWindowSystemInterface::handleTabletLeaveProximityEvent(ulong timestamp, int device, int pointerType, qint64 uid)
{
    QWindowSystemInterfacePrivate::TabletLeaveProximityEvent *e =
            new QWindowSystemInterfacePrivate::TabletLeaveProximityEvent(timestamp, device, pointerType, uid);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleTabletLeaveProximityEvent(int device, int pointerType, qint64 uid)
{
    ulong time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleTabletLeaveProximityEvent(time, device, pointerType, uid);
}

#ifndef QT_NO_GESTURES
void QWindowSystemInterface::handleGestureEvent(QWindow *window, ulong timestamp, Qt::NativeGestureType type,
                                                QPointF &local, QPointF &global)
{
    QWindowSystemInterfacePrivate::GestureEvent *e =
        new QWindowSystemInterfacePrivate::GestureEvent(window, timestamp, type, local, global);
       QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleGestureEventWithRealValue(QWindow *window, ulong timestamp, Qt::NativeGestureType type,
                                                                qreal value, QPointF &local, QPointF &global)
{
    QWindowSystemInterfacePrivate::GestureEvent *e =
        new QWindowSystemInterfacePrivate::GestureEvent(window, timestamp, type, local, global);
    e->realValue = value;
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

void QWindowSystemInterface::handleGestureEventWithSequenceIdAndValue(QWindow *window, ulong timestamp, Qt::NativeGestureType type,
                                                                         ulong sequenceId, quint64 value, QPointF &local, QPointF &global)
{
    QWindowSystemInterfacePrivate::GestureEvent *e =
        new QWindowSystemInterfacePrivate::GestureEvent(window, timestamp, type, local, global);
    e->sequenceId = sequenceId;
    e->intValue = value;
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}
#endif // QT_NO_GESTURES

void QWindowSystemInterface::handlePlatformPanelEvent(QWindow *w)
{
    QWindowSystemInterfacePrivate::PlatformPanelEvent *e =
            new QWindowSystemInterfacePrivate::PlatformPanelEvent(w);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}

#ifndef QT_NO_CONTEXTMENU
void QWindowSystemInterface::handleContextMenuEvent(QWindow *w, bool mouseTriggered,
                                                    const QPoint &pos, const QPoint &globalPos,
                                                    Qt::KeyboardModifiers modifiers)
{
    QWindowSystemInterfacePrivate::ContextMenuEvent *e =
            new QWindowSystemInterfacePrivate::ContextMenuEvent(w, mouseTriggered, pos,
                                                                globalPos, modifiers);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}
#endif

#ifndef QT_NO_WHATSTHIS
void QWindowSystemInterface::handleEnterWhatsThisEvent()
{
    QWindowSystemInterfacePrivate::WindowSystemEvent *e =
            new QWindowSystemInterfacePrivate::WindowSystemEvent(QWindowSystemInterfacePrivate::EnterWhatsThisMode);
    QWindowSystemInterfacePrivate::handleWindowSystemEvent(e);
}
#endif

#ifndef QT_NO_DEBUG_STREAM
Q_GUI_EXPORT QDebug operator<<(QDebug dbg, const QWindowSystemInterface::TouchPoint &p)
{
    QDebugStateSaver saver(dbg);
    dbg.nospace() << "TouchPoint(" << p.id << " @" << p.area << " normalized " << p.normalPosition
                  << " press " << p.pressure << " vel " << p.velocity << " state " << (int)p.state;
    return dbg;
}
#endif

// The following functions are used by testlib, and need to be synchronous to avoid
// race conditions with plugins delivering native events from secondary threads.

Q_GUI_EXPORT void qt_handleMouseEvent(QWindow *w, const QPointF &local, const QPointF &global, Qt::MouseButtons b, Qt::KeyboardModifiers mods, int timestamp)
{
    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
    QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
    const qreal factor = QHighDpiScaling::factor(w);
    QWindowSystemInterface::handleMouseEvent(w, timestamp, local * factor,
                                             global * factor, b, mods);
    QWindowSystemInterface::setSynchronousWindowSystemEvents(wasSynchronous);
}

Q_GUI_EXPORT void qt_handleKeyEvent(QWindow *w, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text = QString(), bool autorep = false, ushort count = 1)
{
    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
    QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
    QWindowSystemInterface::handleKeyEvent(w, t, k, mods, text, autorep, count);
    QWindowSystemInterface::setSynchronousWindowSystemEvents(wasSynchronous);
}

Q_GUI_EXPORT bool qt_sendShortcutOverrideEvent(QObject *o, ulong timestamp, int k, Qt::KeyboardModifiers mods, const QString &text = QString(), bool autorep = false, ushort count = 1)
{
#ifndef QT_NO_SHORTCUT

    // FIXME: This method should not allow targeting a specific object, but should
    // instead forward the event to a window, which then takes care of normal event
    // propagation. We need to fix a lot of tests before we can refactor this (the
    // window needs to be exposed and active and have a focus object), so we leave
    // it as is for now. See QTBUG-48577.

    QGuiApplicationPrivate::modifier_buttons = mods;

    QKeyEvent qevent(QEvent::ShortcutOverride, k, mods, text, autorep, count);
    qevent.setTimestamp(timestamp);

    QShortcutMap &shortcutMap = QGuiApplicationPrivate::instance()->shortcutMap;
    if (shortcutMap.state() == QKeySequence::NoMatch) {
        // Try sending as QKeyEvent::ShortcutOverride first
        QCoreApplication::sendEvent(o, &qevent);
        if (qevent.isAccepted())
            return false;
    }

    // Then as QShortcutEvent
    return shortcutMap.tryShortcut(&qevent);
#else
    Q_UNUSED(o)
    Q_UNUSED(timestamp)
    Q_UNUSED(k)
    Q_UNUSED(mods)
    Q_UNUSED(text)
    Q_UNUSED(autorep)
    Q_UNUSED(count)
    return false;
#endif
}

namespace QTest
{
    Q_GUI_EXPORT QTouchDevice * createTouchDevice(QTouchDevice::DeviceType devType = QTouchDevice::TouchScreen)
    {
        QTouchDevice *ret = new QTouchDevice();
        ret->setType(devType);
        QWindowSystemInterface::registerTouchDevice(ret);
        return ret;
    }
}

Q_GUI_EXPORT void qt_handleTouchEvent(QWindow *w, QTouchDevice *device,
                                const QList<QTouchEvent::TouchPoint> &points,
                                Qt::KeyboardModifiers mods = Qt::NoModifier)
{
    bool wasSynchronous = QWindowSystemInterfacePrivate::synchronousWindowSystemEvents;
    QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
    QWindowSystemInterface::handleTouchEvent(w, device,
                                             QWindowSystemInterfacePrivate::toNativeTouchPoints(points, w), mods);
    QWindowSystemInterface::setSynchronousWindowSystemEvents(wasSynchronous);
}

QWindowSystemEventHandler::~QWindowSystemEventHandler()
{
    QWindowSystemInterfacePrivate::removeWindowSystemEventhandler(this);
}

bool QWindowSystemEventHandler::sendEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *e)
{
    QGuiApplicationPrivate::processWindowSystemEvent(e);
    return true;
}

QWindowSystemInterfacePrivate::WheelEvent::WheelEvent(QWindow *w, ulong time, const QPointF &local, const QPointF &global, QPoint pixelD,
        QPoint angleD, int qt4D, Qt::Orientation qt4O, Qt::KeyboardModifiers mods, Qt::ScrollPhase phase, Qt::MouseEventSource src, bool inverted)
    : InputEvent(w, time, Wheel, mods), pixelDelta(pixelD), angleDelta(angleD), qt4Delta(qt4D),
      qt4Orientation(qt4O), localPos(local), globalPos(global), phase(phase), source(src), inverted(inverted)
{
}

void QWindowSystemInterfacePrivate::TabletEvent::setPlatformSynthesizesMouse(bool v)
{
    platformSynthesizesMouse = v;
}

QT_END_NAMESPACE