Possible garbage collection problem with QGraphicsItem

farcat

Hi,

I noticed a situation in PySide where try to remove a QGraphicsItem from a parentItem/scene and it doesn't get remove from the scene when i call setParentItem(None). When I remove another (added by myself) reference to the QGraphicsItem it does work. Some code:
@
class Item(QGraphicsItem):

def __init__(self, parent):
    super(Item, self).__init__(parent)
    self.select_target = self
    ...

item = Item(anotheritem)
item.setParentItem(None) #does not remove it from the scene, still gets hover events, etc.
@

however when I add:

@
def delete(self):
self.select_target = None
self.setParentItem(None)
@

and call that, the item is removed. I would expect both to have the same result, because of two reasons:

i thought items where responsible for painting their children and setParentItem(None) removes the item as a child
the self.select_target = self is a circular reference that should be detected by the garbage collector

UPDATE:
found in docs: using setParentItem(0) .. 'None' in PySide .. remove item from parent item AND MOVES IT TO THE SCENE. Using

@
def delete(self):
self.setParentItem(None)
self.scene().removeItem(self)
@

seems to work for me (now i think of it, might give a problem if parentItem or scene was never set, leave that as exercise). Still strange that self.select_target = None worked as well ....