Is there a way to detect when all child items within a QTreeWidgetItem have been marked 'hidden'?

Is there a preferred way to detect when all of a QTreeWidgetItem's children are marked as hidden? Currently, I'm iterating over all of them every time any of them are hid开发者_StackOverflow中文版den.

Keep a counter of hidden items and change the value of the counter if an item changed its state of hidden-ness. So each time you use the information you do not iterate over all items!