gtk:drag-source-target-list (widget)

widget -- a gtk:widget that is a drag source
tlist -- a gtk:target-list instance with the draggable targets, or nil for none

The gtk:drag-source-target-list function gets the list of targets this widget can provide for drag and drop. The (setf gtk:drag-source-target-list) function changes the target types.

The widget must first be made into a drag source with the gtk:drag-source-set function.