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/*! \internal
\mainpage Qt Quick Pointer Event Delivery
QPointerEvent instances are stack-allocated in
QGuiApplicationPrivate::processMouseEvent(),
QGuiApplicationPrivate::processTouchEvent() etc., and sent to the
application via QCoreApplication::sendSpontaneousEvent() (taking QWindow
and QEvent pointer arguments). If the window is a QQuickWindow, the QTouchEvent
arrives to QQuickWindow::event() which then dispatches to the
QQuickDeliveryAgent. QQuickDeliveryAgent contains much of the event
delivery code. In fact, it's quite complex, for legacy reasons such as
touch->mouse synthesis in three possible layers, handling events in
QQuickItem subclasses in C++, event compression, multiple kinds of event
filtering, drag-and-drop, dealing with popup menus and so on; but let's
start with the ideal case: no synthesis, no filtering, no popups, and all
events are handled in
<a href="https://doc.qt.io/qt-6/qtquickhandlers-index.html">Pointer Handlers</a>.
Here are some "ideal" scenarios:
- \subpage qq-ideal-pointer-event-delivery-single-drag
*/
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