Archive for the ‘AS3’ Category

When you’re faced with the task of firing events from within a class and you can’t extend EventDispatcher, you need to implement the IEventDispatcher interface. It’s a straightforward approach to keeping your classes loosely coupled, well-encapsulated and capable of firing their own events:

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class YourClass implements IEventDispatcher {   private var eventDispatcher:EventDispatcher = new EventDispatcher();   public function YourClass() { // do constructor stuff here }   public function addEventListener(type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false):void { eventDispatcher.addEventListener(type, listener, useCapture, priority, useWeakReference); }   public function removeEventListener(type:String, listener:Function, useCapture:Boolean=false):void { eventDispatcher.removeEventListener(type, listener, useCapture); }   public function dispatchEvent(event:Event):Boolean { return eventDispatcher.dispatchEvent(event); }   public function hasEventListener(type:String):Boolean { return eventDispatcher.hasEventListener(type); }   public function willTrigger(type:String):Boolean { return eventDispatcher.willTrigger(type); } }

All we’re really doing here is creating a private EventDispatcher object and hooking all its methods through public methods of your custom class.