How can both graphicsView and graphicsItem receive mousemoveEvent?

[olidem]

Please note the following:
A MouseEvent propagates at first to the item under the mouse.

If you subclass the item and call QGraphicsItem::mouseXXXEvent(envent), it will be propagated further. If you don't do that, the event is seen as processed and "dies".
But if you call the parent handler, then you will meet this event also in the scene and the view again.

Regards,
Olli