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QGraphicsView will convert QTouchEvents to QGraphicsSceneTouchEvents
and send them to the scene. The scene will then send the touch events
to the appropriate item. Like mouse event support, the item that
accepts the touch begin is the item that will get all subsequent touch
events. if no item accepts the touch begin event, then no touch events
are sent to any item (and mouse events are sent instead).
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like Qt::WA_AcceptTouchEvents, QGraphicsItems don't receive touch
events unless touch events are explicitly enabled.
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these events contain a list of all touch points. note that the
coordinates for QTouchEvent are floating point, since many devices
offer sub-pixel resolution.
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