 | | | EventDispatcher 1 frame delay | EventDispatcher 1 frame delay
2004-02-17 - By Phil Chung
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I don 't know if the following is good form, but I want to try to prove what Tatsuo and I are saying (ie., that EventDispatcher itself doesn 't need a frame to work, but that it 's the process of setting up the listener that is the issue).
I modified the class that you built Muzak:
<code >
import mx.events.EventDispatcher;
class BasicClass extends MovieClip {
public var listeners:Array;
private static var __eventInit = EventDispatcher.initialize(BasicClass.prototype);
var addEventListener:Function;
var removeEventListener:Function;
var dispatchEvent:Function;
function BasicClass() {
init();
}
function init() {
for (var i = 0; i <listeners.length; i++) {
addEventListener( "init ", listeners[i]);
}
dispatchEvent({type: "init "});
}
}
</code >
Then, here is what is in the Flash movie:
<code >
var handlerObject:Object = {};
handlerObject.init= function(o) {
trace( "init ");
};
this.attachMovie( "basic ", "basic_mc ",0,{listeners:[handlerObject]});
</code >
Again, i 'm not sure if this is good form because it requires the setting of the listeners within the dispatching class itself, but at least it shows that EventDispatcher DOESN 'T need a frame to work.
I think pretty much the only time you might want to do this is if you need an "init " event to fire when the class initializes. If you 're firing any other type of event, you can assign the listener externally before firing the event so there won 't be any issues.
Any thoughts?
Phil
Original Message:
>From: "Tatsuo Kato " <studio@(protected) >
>To: <flashcoders@(protected) >
>Subject: Re: [Flashcoders] EventDispatcher 1 frame delay
>Date: Wed, 18 Feb 2004 03:59:02 +0900
>hm, I still don 't get your point, Muzak. Neither does Phil, it seems.
>
>It doesn 't take a frame or an interval for an object initialized with
>mx.events.EventDispatcher to be able to dispatch an event.
>It only needs a fact that a listener is registered before dispatching.
>
>And it works for me wherever it 's written, frame1 of _root or the
>component or wherever.
>In order for it to work, it just needs a listener having been registered
>before dispatching.
>
>Cheers,
>--
>Tatsuo Kato
>http://tatsuokato.com
>
>-- -- Original Message -- --
>From: "Muzak " <p.ginneberge@(protected) >
>To: <flashcoders@(protected) >
>Sent: Wednesday, February 18, 2004 3:27 AM
>Subject: Re: [Flashcoders] EventDispatcher 1 frame delay
>
>
> > Sorry about the confusion.
> > I 'm not trying to dispatch an event in the constructor.
> > That was just some sample code (with the 'init ' event) to show that it does take a frame for the EventDispatcher to work properly.
> >
> > And yes, it makes perfect sense that nothing happens before a listener is registered.
> > The thing is, you can 't tell when a listener has been registered... (not sure if that makes any sense tho).
> >
> > And in case you ever have to dispatch an event in the 'first frame ' of a component (or a Class), it won 't work.
> >
> > regards,
> > Muzak
> >
> > -- -- Original Message -- --
> > From: "Tatsuo Kato " <studio@(protected) >
> > To: <flashcoders@(protected) >
> > Sent: Tuesday, February 17, 2004 7:02 PM
> > Subject: Re: [Flashcoders] EventDispatcher 1 frame delay
> >
> >
> > > Muzak,
> > >
> > > Maybe I 'm missing something but I 'm confused as to what you are up to. ;)
> > > Why do you have to dispatch an event in the constructor of the event
> > > dispatcher object?
> > >
> > > It makes perfect sense that nothing happens when you dispatch an event
> > > before the listener is registered as a listener.
> > >
> > > Cheers,
> > > --
> > > Tatsuo Kato
> > > http://tatsuokato.com
>
>
>
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