RE: [flexcoders] Re: Simple Event Listener Examples between 2 classes

Tue, 11 Jul 2006 05:39:53 -0700

You're not adding the TestHandler object as a listener of the TestDispatcherClass object.  Your code is actually registering to itself.  Also, you probably shouldn't dispatch an event from the constructor, since that runs before anything else you won't be able to add a listener before your constructor dispatches the event.  Try this:
 
package com.test {
import flash.display.Sprite;
import flash.events.Event;
public class TestDispatcherClass extends Sprite {
public function runDispatch() {
dispatchEvent(new Event("action"));
}
}
}
 
 
package com.test {
import mx.controls.Alert;
import flash.display.Sprite;
import com.test.TestDispatcherClass;
public class TestHandler extends Sprite {
public function TestHandler(dispatcher:TestDispatcherClass) {
dispatcher.addEventListener("action", actionHandler);
}
public function actionHandler(event:Event):void  {
Alert.show("hanlded event:" + event.toString());
}
}
}
 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" xmlns="*" creationComplete="this.initApp();">
<mx:Script>
<![CDATA[
import com.test.TestHandler;
import com.test.TestDispatcherClass;
private var test:TestHandler;
private var dispatcher:TestDispatcherClass;
private function initApp():void {
dispatcher = new TestDispatcherClass();
test = new TestHandler(this.dispatcher);
dispatcher.runDispatch();
}
]]>
</mx:Script>
</mx:Application>


From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of efeminella
Sent: Monday, July 10, 2006 10:12 PM
To: [email protected]
Subject: [flexcoders] Re: Simple Event Listener Examples between 2 classes

Yeah, I have read the documentation for the new event model but I am
having a few issues. Here is a simple example of what I am trying.
Maybe you could give me some insight as to what I am doing wrong:

package com.test {

import flash.display.Sprite;
import flash.events.Event;
import com.test.EventManager;
import mx.controls.Alert;

public class TestDispatcherClass extends Sprite {

public function TestDispatcherClass()
{
this.dispatchEvent(new Event("action"));
}
}
}

the class that will handle the event and get data from the dispatcher:

package com.test {

import com.test.EventManager;
import flash.events.EventDispatcher;
import flash.events.Event;
import mx.controls.Alert;
import flash.display.Sprite;

public class TestHandler extends Sprite {

public function TestHandler()
{
this.addEventListener("action", actionHandler);
}

public function actionHandler(event:Event):void
{
Alert.show("hanlded event:" + event.toString());
}
}
}

.mxml:
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" xmlns="*" creationComplete="this.initApp();">

<mx:Script>
<![CDATA[

import com.test.TestHandler;
import com.test.TestDispatcherClass;

private var test:TestHandler;
private var dispatcher:TestDispatcherClass;

private function initApp():void {
this.test = new TestHandler();
this.dispatcher = new TestDispatcherClass();
}
]]>
</mx:Script>
</mx:Application>

Any Ideas???

--- In [EMAIL PROTECTED]ups.com, "Jeremy Lu" <[EMAIL PROTECTED]> wrote:
>
> All your classes can extends flash.events.EventDispatcher then they
can just
> fire a
>
> this.dispatchEvent(new MyEvent(aaa, bbb, ccc));
>
> other classes can use addEventListener("XMLParsed", someHandler) to
handle
> the event.
>
> or you can take a look at how Cairngorm use Cairngorm Event
dispatcher as a
> cetralized event center to dispatch event for every class.
>
>
> Jeremy.
>
> On 7/11/06, efeminella <efeminella@...> wrote:
> >
> > Does anyone have any simple examples of how to dispatch and handle
> > events between 2 classes. For example how can I have a class that
> > loads and parses xml and then dispatch an event which another class
> > handles and the event and displays the data. Sort of like we did in AS
> > 2 with event.target...
> >
> > Thanks in advance,
> > Eric Feminella
> >
> >
> >
>

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