Package com.jogamp.newt.event

Interface GestureHandler

All Known Implementing Classes:
DoubleTapScrollGesture, PinchToZoomGesture
public interface GestureHandler
Generic gesture handler interface designed to allow pass-through filtering of InputEvents.

To avoid negative impact on event processing, implementation shall restrict computation as much as possible and only within it's appropriate gesture states.

To allow custom user events, other than the normal InputEvents, a user may return a GestureHandler.GestureEvent in it's implementation.

  • Field Details

    • DEBUG

      static final boolean DEBUG

  • Method Details

    • clear

      void clear(boolean clearStarted)
      Clears state of handler, i.e. resets all states incl. previous detected gesture.
      Parameters:
      clearStarted - if true, also clears started state, otherwise stay within gesture - if appropriate. Staying within a gesture allows fluent continuous gesture sequence, e.g. for scrolling.

    • hasGesture

      boolean hasGesture()
      Returns true if a previous process(InputEvent) command produced a gesture, which has not been cleared. Otherwise returns false.

    • getGestureEvent

      InputEvent getGestureEvent()
      Returns the corresponding InputEvent for the gesture as detected by a previous process(InputEvent), which has not been cleared. Otherwise returns null.

      Only implemented for gestures mapping to InputEvents.

    • isWithinGesture

      boolean isWithinGesture()
      Returns true if within a gesture as detected by a previous process(InputEvent) command, which has not been cleared. Otherwise returns false.

    • process

      boolean process(InputEvent e)
      Process the given InputEvent and returns true if it produced the gesture. Otherwise returns false.

      If a gesture was already detected previously and has not been cleared, method does not process the event and returns true.

      Besides validation of the event's details, the handler may also validate the InputEvent.InputClass and/or InputEvent.InputType.