Flex 自定义类发送事件的三种方式

1 继承 EventDispatcher类

 让自定义类继承自EventDispatcher，就可以进行时间发送了 ，这是最方便最快捷的方式。

import flash.events.Event;import flash.events.EventDispatcher;public class SampleDispatcher1 extends EventDispatcher{public static var ACTION:String ="action";public function doSomething():void{this.dispatchEvent(new Event(SampleDispatcher1.ACTION));}}

2 实现IEventDispatcher接口

我们的这个自定义类可能是引文本身已经继承了其他类，无法再继承EventDiapathcer，而我们恰恰希望它呢能够实现EventDispatcher类的所有功能

由于   IEventDispatcher需要实现五个接口---addEventListener、dispatcherEvent、hasEventListener、willTrigger、removeListener所以我们的类也必须实现着五个接口。

package{import flash.events.Event;import flash.events.EventDispatcher;import flash.events.IEventDispatcher;public class SampleDispatcher2 implements IEventDispatcher{public var _dispatcher:EventDispatcher;public static const ACTION:String="ohyeah";public function SampleDispatcher2(){initSender();}public function initSender():void{_dispatcher=new EventDispatcher(this);}public function addEventListener(type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false):void{_dispatcher.addEventListener(type,listener,useCapture,priority,useWeakReference);}public function removeEventListener(type:String, listener:Function, useCapture:Boolean=false):void{_dispatcher.removeEventListener(type,listener,useCapture);}public function dispatchEvent(event:Event):Boolean{return _dispatcher.dispatchEvent(event);}public function hasEventListener(type:String):Boolean{return _dispatcher.hasEventListener(type);}public function willTrigger(type:String):Boolean{return _dispatcher.willTrigger(type);}}}