Interface definition for a callback to be invoked when a drag is being dispatched to this view. The callback will be invoked before the hosting view's own onDrag(event) method. If the listener wants to fall back to the hosting view's onDrag(event) behavior, it should return 'false' from this callback.
For a guide to implementing drag and drop features, read the Drag and Drop developer guide.
Called when a drag event is dispatched to a view.
Called when a drag event is dispatched to a view. This allows listeners to get a chance to override base View behavior.
|The View that received the drag event.
DragEvent object for the drag event.
true if the drag event was handled successfully, or
if the drag event was not handled. Note that
false will trigger the View
to call its