One Finger Double Tap
The ‘double tap’ event is the touch equivalent of a ‘mouse double click’ event. When a finger is placed on the screen and removed twice within certain spatial & temporal intervals, the event fires.
Using the One Finger Double Tap Gesture
One Finger Double Tap can be used to select items or provide a hierarchical selection structure when combined with other forms of Tap. One Finger Double Tap is used in the same context(s) as a ‘mouse double click’ event in a traditional user interface (UI).
Mechanics and Code Samples
To register a ‘double tap’ event, a finger must touch down on the screen and then be lifted up again and touch down again 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 ‘double tap’ and not unrelated touch events.
1 2 3 4 5 6 | element.addEventListener(TouchEvent.TOUCH_DOUBLE_TAP, touchDoubleTapHandler); private function touchDoubleTapHandler(e:TouchEvent):void { trace("e type:",e.type); } |
Parameters
All touch and gesture events have a localX and localY (relative) position as well as a stageX and stageY (absolute) position.
In addition, the ‘One Finger Double Tap’ gesture has a spatial separation threshold between the first tap and the second tap. After the first two taps within a certain time period, the event will not respond to subsequent “rapid-fire” taps.
Related Gestures
Associated Tutorials
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