Actionscript 3.0 事件机制剖析---事件发送方式（二）

 

          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 : [e-mail] * 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。