qtreewidget and drop event detection

i would like to detect (before the action is done) that a new branch will be created as a result of a move of an item inside the tree, so i can prevent it.

Through DropEvent I can get the proposed action for move but cannot figure out that the proposed action will also create a branch.
how can i do that?


An other way for me to solve it, would be to authorize move, but prevent branch creation, i don't know either how to do that.



Many Thanks in advance

For QTreeWidget it won't be that easy. If you were using the model approach, you could simply return false from QAbstractItemModel::insertRows() implementation if it would create a branch. It is possible you can obtain a similar effect with the tree widget if you clear the ItemIsDropEnabled flag on leaves of the tree.