gtk-tree-view-enable-model-drag-source (view mask targets actions)

view -- a gtk-tree-view widget
mask -- a gdk-modifier-type mask of allowed buttons to start drag
targets -- a list of target entries that the drag will support
actions -- the gdk-drag-action bitmask of possible actions for a drag from this widget

Turns the tree view into a drag source for automatic DND. Calling this method sets the reorderable property to the false value.