If you have a QGraphicsObject and a viewport of the QGraphicsView subscribing to the same gesture that uses QTouchEvents, then the QGestureEvent may be delivered twice to the graphicsobject:

• first when the QTouchEvent is delivered to QGraphicsView viewport, it is filtered through gesture recognizer and it triggers
• that QGesture is delivered as a part of QGestureEvent to the viewport and then propagates to the scene and to QGraphicsObject
• then the touch event is delievered to the QGraphicsObject, it is filtered through gesture recognizer which triggers
• that event again delivered to the viewport and then to QGraphicsObjects.