[PyQt] Handling QGraphicsItem snapping outside of itemChange
devan.richmond at gmail.com
Wed Feb 25 09:45:24 GMT 2015
I've been trying to create a snap to grid type system for QGraphicsScene and
it seems that most solutions rely on altering the item itself in it's itemChange
method. The problem I have with that solution is that it will also affect
what happens when you use QGraphicsItem::setPos
My ideal solution would decouple the items from any notion of grid snapping such
that the QGraphicsScene deals exclusively with the snapping.
def mouseMoveEvent(self, event):
# snapping logic
I know that QGraphicsSceneMouseEvent::setScenePos is internal and not public but
it demonstrates what type of functionality I'm aiming for. Similarly, the
constructor is also internal so I can't subclass or create a new instance to
inject my own event.
A kick in the right direction about how to implement something like this without
using undocumented functions would be much appreciated.
More information about the PyQt