This interface is sourced from a
DragGestureRecognizer
and is invoked
when an object of that (sub)class detects a drag initiating
gesture.
This interface is sourced from a
DragGestureRecognizer
and is invoked
when an object of that (sub)class detects a drag initiating
gesture.
The implementor of this interface is responsible for starting the drag
as a result of receiving such notification.