Turns @tree_view into a drag source for automatic DND. Calling this method sets #GtkTreeView:reorderable to %FALSE.
Mask of allowed buttons to start drag
the target formats that the drag will support
the bitmask of possible actions for a drag from this widget
See Implementation
Turns @tree_view into a drag source for automatic DND. Calling this method sets #GtkTreeView:reorderable to %FALSE.