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POClass implementing IEventDispatcher cannot use Event metadata tag
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  1. POClass implementing IEventDispatcher cannot use Event metadata tag
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    copied!<p>Okay Flex gurus, we have following class</p> <pre><code>package { import flash.events.Event; import flash.events.EventDispatcher; import flash.events.IEventDispatcher; import mx.controls.Alert; import mx.core.IMXMLObject; [Event(name="progressReady", type="flash.events.Event")] public class IndependentClass implements IMXMLObject, IEventDispatcher{ public var dispatcher:IEventDispatcher; public function initialized(document:Object, id:String):void{ dispatcher = document as EventDispatcher; addEventListener("progressReady", progressReadyListener); } public function progressReadyListener(e:Event):void{ Alert.show("progressReadyListener inside"); } public function click():void{ dispatchEvent(new Event("progressReady", true)); } public function addEventListener(type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false):void{ if(dispatcher != null){ dispatcher.addEventListener(type, listener, useCapture, priority, useWeakReference); } } public function dispatchEvent(event:Event):Boolean{ if(dispatcher != null){ return dispatcher.dispatchEvent(event); } return false; } public function hasEventListener(type:String):Boolean{ if(dispatcher != null){ return dispatcher.hasEventListener(type); } return false; } public function removeEventListener(type:String, listener:Function, useCapture:Boolean=false):void{ if(dispatcher != null){ dispatcher.removeEventListener(type, listener, useCapture); } } public function willTrigger(type:String):Boolean{ if(dispatcher != null){ return dispatcher.willTrigger(type); } return false; } } } </code></pre> <p>And we have following MXML markup:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:local="*"&gt; &lt;fx:Script&gt; &lt;![CDATA[ import mx.controls.Alert; protected function progressHandler():void{ Alert.show("progressHandler outside"); } ]]&gt; &lt;/fx:Script&gt; &lt;fx:Declarations&gt; &lt;local:IndependentClass id="ic" progressReady="progressHandler()"/&gt; &lt;/fx:Declarations&gt; &lt;s:Button click="{ic.click()}"/&gt; &lt;/s:Application&gt; </code></pre> <p>If you run these, you'll notice that the MXML-component can't hear the event. The question is simple, is there some way of getting the Event-metadata tag to work WITHOUT extending EventDispatcher? I would like to keep this class independent and use object composition as much as possible.</p> <p>And no, I don't want to use ActionScript addEventListener in the MXML-file. It doesn't tell the developer anything like good old Event metadata tag, and besides, that is not the point of this example. :)</p> <p>Hopefully someone can enlighten what the event metadata tag does behind the curtains.</p>
 

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