Actionscript 3.0 事件机制剖析

                                                  事件发送方式（二）

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  本文链接：http://blog.csdn.net/li_007/archive/2009/03/02/3949812.aspx

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   关于复合EventDispatcher class的方法很简单，就是在要发送事件的class中声明一个EventDispatcher的对象，然后在要发送Event的地方调用EventDispatcher实例对象的dispatchEvent方法就OK。具体实现如下：

  1、AlarmEvent class不做任何改变。

  2、测试文档类实现如下： package { import flash.display.Sprite; import flash.events.Event; import flash.events.EventDispatcher; import flash.events.TimerEvent; import flash.utils.Timer; /** * Written by Leezhm, 28th February, 2009 * Contact : Leezhm@126.com * Last Modified by Leezhm on 2nd March, 2009 **/ public class Alarm extends Sprite { private var _timer:Timer; private var _dispatcher:EventDispatcher; public function Alarm():void { InitTimer(); } private function InitTimer():void { if (null == this._timer) { this._timer = new Timer(0, 1); } this._timer.addEventListener(TimerEvent.TIMER_COMPLETE, OnTimerComplete); SetAlarmClock(16, 49); } private function OnTimerComplete(evt:TimerEvent = null):void { if (null == this._dispatcher) { this._dispatcher = new EventDispatcher(); this._dispatcher.addEventListener(AlarmEvent.TIME_ALARM, OnAlarm); } var _alarm:AlarmEvent = new AlarmEvent(); _alarm.message = "Please get up!!!It's time for breakfast!!!"; this._dispatcher.dispatchEvent(_alarm); } private function OnAlarm(evt:AlarmEvent = null):void { trace("Alarm!!!"); var _alarmClone:Event = evt.clone(); trace(_alarmClone); } /** * Sets the time at which the alarm should go off. * @param hour The hour portion of the alarm time. * @param minutes The minutes portion of the alarm time. */ private function SetAlarmClock(hour:uint, minutes:uint):void { var _now:Date = new Date(); var _alarmClock:Date = new Date(_now.fullYear, _now.month, _now.date, hour, minutes); if (_alarmClock <= _now) { trace("Error time! Now is " + _now.toLocaleDateString()); } else { //reset the timer; this._timer.reset(); this._timer.delay = _alarmClock.time - _now.time; this._timer.start(); } } } }

顺便贴上测试结果截图：

在上面的Alarm class中复合了一个EventDispatcher实例对象。