[flexcoders] Howto create an mx:image extension that supports URLRequest for source property

[pgp.coppens]

Hello

I am trying to create a "drop-in" extension for mx:image that supports
an URLRequest for source property. The reason is that the (server)
images should be retrieved using a POST and some custom headers added to
the HTTP request.

I have something that somewhat works but seems far from optimal, and
also behaves weird when I use the extended image control in an
itemrenderer

This is the code. I am sure this is not the way, but what is the way?
E.g. the listener stuff is wrong and setting the source triggers a
second load, which does not feel correct.

Seems like having image control with a URLRequest for its source is a
fairly common requirement

Any guidance would be really welcomed

Thanks,

Peter

The code


    public class ImageFromURLRequest extends Image {
         public function ImageFromURLRequest() {
             super();
         }

         private var _listeners:ArrayCollection = new ArrayCollection();
         private var stream:String = "content";
         private var partIx:int = 0;

         override public function
addEventListener(type:String,listener:Function,useCapture:Boolean =
false,priority:int = 0,useWeakReference:Boolean = false):void {
             var lstnr:Object = new Object;
             lstnr["type"] = type;
             lstnr["listener"] = listener;
             lstnr["useCapture"] = useCapture;
             lstnr["priority"] = priority;
             lstnr["useWeakReference"] = useWeakReference;
            _listeners.addItem(lstnr);
             trace("Listening for " +type);
         }

         override public function load(url:Object = null):void {
             if(url is URLRequest) {
               var urlLoader:URLLoader = new URLLoader();
               urlLoader.dataFormat  = URLLoaderDataFormat.BINARY;

                 var imageLoaded:Function = function(event:Event):void {
                 source=urlLoader.data
                 if(hasEventListener(Event.COMPLETE)) {
                     dispatchEvent(event);
                 }
                 }
                 urlLoader.addEventListener(Event.COMPLETE,imageLoaded);
               for each(var lstnr:Object in _listeners) {
                  
urlLoader.addEventListener(lstnr["type"],lstnr["listener"],lstnr["useCap\
ture"],lstnr["priority"],lstnr["useWeakReference"]);
               }
                 urlLoader.load(url as URLRequest);
             } else {
                 super.load(url);
             }
         }


     }