qt-everywhere-src-5.14.1/qtbase/src/plugins/platforms/cocoa/qnsview_touch.mm

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// This file is included from qnsview.mm, and only used to organize the code

Q_LOGGING_CATEGORY(lcQpaTouch, "qt.qpa.input.touch")

@implementation QNSView (Touch)

- (bool)shouldSendSingleTouch
{
    if (!m_platformWindow)
        return true;

    // QtWidgets expects single-point touch events, QtDeclarative does not.
    // Until there is an API we solve this by looking at the window class type.
    return m_platformWindow->window()->inherits("QWidgetWindow");
}

- (void)touchesBeganWithEvent:(NSEvent *)event
{
    if (!m_platformWindow)
        return;

    const NSTimeInterval timestamp = [event timestamp];
    const QList<QWindowSystemInterface::TouchPoint> points = QCocoaTouch::getCurrentTouchPointList(event, [self shouldSendSingleTouch]);
    qCDebug(lcQpaTouch) << "touchesBeganWithEvent" << points << "from device" << Qt::hex << [event deviceID];
    QWindowSystemInterface::handleTouchEvent(m_platformWindow->window(), timestamp * 1000, QCocoaTouch::getTouchDevice(QTouchDevice::TouchPad, [event deviceID]), points);
}

- (void)touchesMovedWithEvent:(NSEvent *)event
{
    if (!m_platformWindow)
        return;

    const NSTimeInterval timestamp = [event timestamp];
    const QList<QWindowSystemInterface::TouchPoint> points = QCocoaTouch::getCurrentTouchPointList(event, [self shouldSendSingleTouch]);
    qCDebug(lcQpaTouch) << "touchesMovedWithEvent" << points << "from device" << Qt::hex << [event deviceID];
    QWindowSystemInterface::handleTouchEvent(m_platformWindow->window(), timestamp * 1000, QCocoaTouch::getTouchDevice(QTouchDevice::TouchPad, [event deviceID]), points);
}

- (void)touchesEndedWithEvent:(NSEvent *)event
{
    if (!m_platformWindow)
        return;

    const NSTimeInterval timestamp = [event timestamp];
    const QList<QWindowSystemInterface::TouchPoint> points = QCocoaTouch::getCurrentTouchPointList(event, [self shouldSendSingleTouch]);
    qCDebug(lcQpaTouch) << "touchesEndedWithEvent" << points << "from device" << Qt::hex << [event deviceID];
    QWindowSystemInterface::handleTouchEvent(m_platformWindow->window(), timestamp * 1000, QCocoaTouch::getTouchDevice(QTouchDevice::TouchPad, [event deviceID]), points);
}

- (void)touchesCancelledWithEvent:(NSEvent *)event
{
    if (!m_platformWindow)
        return;

    const NSTimeInterval timestamp = [event timestamp];
    const QList<QWindowSystemInterface::TouchPoint> points = QCocoaTouch::getCurrentTouchPointList(event, [self shouldSendSingleTouch]);
    qCDebug(lcQpaTouch) << "touchesCancelledWithEvent" << points << "from device" << Qt::hex << [event deviceID];
    QWindowSystemInterface::handleTouchEvent(m_platformWindow->window(), timestamp * 1000, QCocoaTouch::getTouchDevice(QTouchDevice::TouchPad, [event deviceID]), points);
}

@end