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Oct 11 2009

[AS3] Event.ENTER_FRAME strange behaviour

Posted by SikoTiko in Experiments, Problems

Have you ever tried in ActionScript 3 this:

this.addEventListener(Event.ENTER_FRAME, cpF1);
this.addEventListener(Event.ENTER_FRAME, cpF2);
 
function cpF1(e:Event):void{
trace("cpF1")
}
function cpF2(e:Event):void{
trace("cpF2")
}

Don’t expect to have traces like “cpF2″ only. You’ll have “cpF1 cpF2″ traced on every frame. This is a very hard to find mistake, if you expect an object to have only one onEnterFrame listener but you add another.

This entry was posted on Sunday, October 11th, 2009 at 0:19 and is filed under Experiments, Problems. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “[AS3] Event.ENTER_FRAME strange behaviour”

vitaLee says:

11.10.2009 at 11:55

that’s one of the advantages you get with AS3.
there’s nothing wrong with it, actually you should expect the same behaviour from all your event listeners (listening to custom and built in events).
SikoTiko says:

24.04.2010 at 0:18

@vitaLee – You are right. Actually I wanted to tell people to be careful with this advantage, because if you forget about it then it can produce unexpected results, when you think you have one listener.