ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Touch, multitouch and gesture input
}
function onTouchMove(event:TouchEvent) {
if(event.touchPointID != touchMoveID) {
myTextField.text = "ignoring unrelated touch";
return;
}
mySprite.x = event.stageX;
mySprite.y = event.stageY;
myTextField.text = "touch move" + event.touchPointID;
}
function onTouchEnd(event:TouchEvent) {
if(event.touchPointID != touchMoveID) {
myTextField.text = "ignoring unrelated touch end";
return;
}
touchMoveID = 0;
stage.removeEventListener(TouchEvent.TOUCH_MOVE, onTouchMove);
stage.removeEventListener(TouchEvent.TOUCH_END, onTouchEnd);
myTextField.text = "touch end" + event.touchPointID;
}
Touch and drag
Flash Player 10.1 and later, Adobe AIR 2 and later
Two methods were added to the Sprite class to provide additional support for touch-enabled applications supporting
touch-point input: Sprite.startTouchDrag() and Sprite.stopTouchDrag(). These methods behave the same as
Sprite.startDrag() and Sprite.stopDrag() do for mouse events. However, notice the
Sprite.startTouchDrag() and Sprite.stopTouchDrag() methods both take touchPointID values as
parameters.
The runtime assigns the touchPointID value to the event object for a touch event. Use this value to respond to a
specific touch point in the case the environment supports multiple, simultaneous, touch points (even if it does not
handle gestures). For more information about the touchPointID property, see “Touch Point ID” on page 586.
The following code shows a simple start drag event handler and a stop drag event handler for a touch event. The
variable bg is a display object that contains mySprite:
mySprite.addEventListener(TouchEvent.TOUCH_BEGIN, onTouchBegin);
mySprite.addEventListener(TouchEvent.TOUCH_END, onTouchEnd);
function onTouchBegin(e:TouchEvent) {
e.target.startTouchDrag(e.touchPointID, false, bg.getRect(this));
trace("touch begin");
}
function onTouchEnd(e:TouchEvent) {
e.target.stopTouchDrag(e.touchPointID);
trace("touch end");
}
And the following shows a more advanced example combining dragging with touch event phases:
Last updated 6/6/2012
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