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PORemoving a QGraphicsItem's parent
 

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    <p>I have a <code>QGraphicsItem</code> called <code>child_item</code> that is a child of another <code>QGraphicsItem</code> called <code>parent_item</code>. I need to unparent <code>child_item</code> from <code>parent_item</code> so that <code>child_item</code> has no parent.</p> <p>But when I try <code>childItem.setItemParent(None)</code> my script crashes. </p> <p>Apparently this is because when you remove a <code>QGraphicsItem</code>'s parent in this way the item is returned to Qt...</p> <p>For now I've just created a <code>global_parent</code> <code>QGraphicsItem</code> so that if any item needs to be unparented I will simply parent it under the <code>global_parent</code> and if a <code>QGraphicsItem</code> has the parent <code>global_parent</code> my code will act like it doesn't have a parent but I would like a better solution.</p> <p>Any ideas please?</p> <h2>Some of my code:</h2> <pre><code>POINT_SIZE = 7 class Test_Box(QGraphicsItem): # Constants WIDTH = 50 * POINT_SIZE HEIGHT = 13 * POINT_SIZE RECT = QRectF(0, 0, WIDTH, HEIGHT) CORNER_RADIUS = 1.5 * POINT_SIZE def __init__(self, position, parent=None): super(Test_Box, self).__init__(parent) # Settings self.setFlags( self.flags() | QGraphicsItem.ItemIsSelectable | QGraphicsItem.ItemIsMovable | QGraphicsItem.ItemIsFocusable | QGraphicsItem.ItemSendsScenePositionChanges ) self.setPos(position) def boundingRect(self): return Test_Box.RECT def paint(self, painter, option, widget): # Draw Box brush = QBrush() painter.setBrush(brush) painter.drawRoundedRect(Test_Box.RECT, Test_Box.CORNER_RADIUS, Test_Box.CORNER_RADIUS) def itemChange(self, change, variant): super(Test_Box, self).itemChange(change, variant) if change == QGraphicsItem.ItemScenePositionHasChanged: self.setParentItem(None) return QGraphicsItem.itemChange(self, change, variant) </code></pre> <p>Calling setItemParent and setting the item's parent to another item does work though so I'm using a generic parent in the meantime.</p>
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    1. COFor anyone interested, I just ended up creating a global QGraphicsItem to use as the default parent so if I want to unparent something, I just parent it under the global parent (which is not visible) so it gives the same effect as having no parent.
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