Using the Triple Tap Gesture
Triple Tap can be used to select items or provide a hierarchical selection structure when combined with other forms of Tap.
Mechanics and Code Samples
To register a ‘triple tap’ event, finger(s) must touch down on the screen and then be lifted up again three times within a limited time period and within a limited spatial area on the touch screen surface. This ensures that the gesture registered is actually a ‘triple tap’ and not unrelated touch events.
Enable the Triple Tap gesture on a TouchSprite (“myTouchSprite” in this example) by adding the gesture to the gestureList property for the TouchSprite:
1 | myTouchSprite.gestureList = {"triple_tap":true}; |
Register an event for the gesture by listening for the ‘TRIPLE_TAP’ GWGestureEvent:
2 | myTouchSprite.addEventListener(GWGestureEvent.TRIPLE_TAP, gestureTripleTapHandler); |
Finally, implement the script(s) that you want to respond to the event in a custom handler:
3 4 5 6 7 | private function gestureTripleTapHandler(event:GWGestureEvent):void { trace("g triple tap (local): ", event.value.local.x, event.value.local.y); trace("g triple tap (stage): ", event.value.stage.x, event.value.stage.y); } |
In this example, the (local and stage/global) x and y coordinates of the Triple Tap gesture are being sent to the Output window.
Gestures can be utilized with a number of touch points. For detailed information about this gesture and more, consult the GestureML Wiki.
