/*
* Sends a source-mouse-out if a dnd operation is started on the source
* widget.
*/
final HandlerRegistration dndStartRegistration = widget.addHandler(
new DragProxyAttachedEventHandler() {
@Override
public void onDragProxyAttached(DragProxyAttachedEvent event) {
state.onSourceMouseOut(DragSupportingPopupManager.this);
}
}, DragProxyAttachedEvent.TYPE);