enableModelDragSource
open fun enableModelDragSource(startButtonMask: <Error class: unknown class>, formats: <Error class: unknown class>, actions: <Error class: unknown class>)
Turns @tree_view into a drag source for automatic DND. Calling this method sets GtkTreeView:reorderable to false.
Parameters
startButtonMask
Mask of allowed buttons to start drag
formats
the target formats that the drag will support
actions
the bitmask of possible actions for a drag from this widget