Add SwipeEvent as a subclass of GestureEvent (next to ScrollEvent, RotateEvent, ZoomEvent). Use native swipe recognition where available, for other platforms implement swipe recognition on toolkit level. Recognize and deliver the gesture as a single event, after possible scroll gesture finishes; deliver it to the node picked on gesture coordinates - for track pad it means location of mouse cursor, for touch screen it means the center of the trajectories of all fingers.

Provide four event types: SWIPE_LEFT, SWIPE_RIGHT, SWIPE_UP, SWIPE_DOWN, with the usual setOnSwipeLeft, ...

Provide a touchCount field for the event reporting number of fingers used.