Where should I be catching touch events for painting on a QGraphicsScene?

I want to reimplement the Qt fingerpaint example using my QGraphicsScene rather than a QWidget. However I cannot find an example of this so am unsure if I should capture the e开发者_如何学JAVAvents at the view and pass them down to the scene or something else. What is the advice here?

How about the the pinch zoom example? It uses a QGraphicsView as the touch area.