Hi
I am using a QTreeView with my own QAbstractItemModel implementation.
My implementation of the parent method looks like this:
1. def parent(self, index):
2. if not index.isValid():
3. return QtCore.QModelIndex()
4. childItem = index.internalPointer()
5.
6. # Make sure this item is valid! If not, we return an
invalid model index.
7. if not isinstance(childItem, TreeNode):
8. logging.warning('Expected a TreeNode instance, but got
something else.')
9. logging.warning('Object received: ' + str(childItem))
10. return QtCore.QModelIndex()
11.
12. parentItem = childItem.parent()
13. if parentItem == self.rootItem:
14. return QtCore.QModelIndex()
15. return self.createIndex(parentItem.row(), 0, parentItem)
The problem is this:
My underlying model data is of type TreeNode (my own class). I would
expect the childItem (line 4) to always
be of type TreeNode, but sporadically I get something else! When that
happens, lines 8, 9 and 10 executes and my program
throws an exception!
How is this possible? How can parent() receive a model index pointing to
something that is NOT my underlying data class?
How do I handle this. Returning an invalid model index (line 10), does
not work, since I get an exception after that.
Kind regards
Dirk Wagener
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