Opaque view type corresponding with a node in the model.
The drop location in a drag-and-drop operation.
The drop location in a drag-and-drop operation. This returns None
if no drop action is currently
being performed. Please note that the root element is removed. It is thus possible that
the path is empty!
A view for tree like data that is presented as a tree table.
the system in which the tree is represented
the opaque node type of the tree, encompassing both branches and leaves
the opaque data type which is a non-transactional view structure used for rendering the nodes.