Actionscript 3.0 事件机制剖析---事件发送方式（三）

     Actionscript 3.0 事件机制剖析

                                                  事件发送方式（三）

 

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  本文链接：http://blog.csdn.net/li_007/archive/2009/03/02/3951003.aspx

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 关于事件发送方式三，肯定是实现IEventDispatcher Interface了。其实EventDispatcher class就是实现了IEventDispatcher Interface的，IEventDispatcher Interface声明了5个事件发送函数，关于IEventDispatcher的描述如下：

   由上面的描述，可以看出，IEventDispatcher Interface的执行还是需要EventDispatcher class 对象的，所以在implements IEventDispatcher Interface的时候，还是要声明一个EventDispatcher的对象，让它来具体实现IEventDispatcher Interface的五个方法。具体实现如下：

1、AlarmEvent class不做任何改变。

2、AlarmClock class实现如下：

package {import flash.events.Event;import flash.events.EventDispatcher;import flash.events.IEventDispatcher;/** * Written by Leezhm, 1st March, 2009 * Contact : [e-mail] * Last Modified by Leezhm on 2nd March, 2009 **/public class AlarmClock implements IEventDispatcher {private var _dispatcher:EventDispatcher;public function AlarmClock():void{InitAlarmClock();}private function InitAlarmClock():void{if (null == this._dispatcher){this._dispatcher = new EventDispatcher(this);}}/** * all function of IEventDispatcher Interface */public function addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void{this._dispatcher.addEventListener(type, listener, useCapture, priority, useWeakReference);} public function dispatchEvent(evt:Event):Boolean{return this._dispatcher.dispatchEvent(evt);}public function hasEventListener(type:String):Boolean{return this._dispatcher.hasEventListener(type);}public function removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void{this._dispatcher.removeEventListener(type, listener, useCapture);}public function willTrigger(type:String):Boolean{return this._dispatcher.willTrigger(type);}}}

 

3、TestAlarmClock class实现如下：

package {import flash.display.Sprite;import flash.events.TimerEvent;import flash.utils.Timer;import flash.events.Event;/** * Written by Leezhm, 1st March, 2009 * Contact : [e-mail] * Last Modified by Leezhm on 2nd March, 2009 **/public class TestAlarmClock extends Sprite {private var _timer:Timer;public function TestAlarmClock():void{InitApplication();}private function InitApplication():void{if (null == this._timer){this._timer = new Timer(0, 1);this._timer.addEventListener(TimerEvent.TIMER_COMPLETE, OnAlarmClockComplete);}SetAlarmClock(23, 34);}private function OnAlarmClockComplete(evt:TimerEvent = null):void{var _alarmEvent:AlarmEvent = new AlarmEvent();_alarmEvent.message = "Please get up!!!It's time for breakfast!!!";var _alarmClock:AlarmClock = new AlarmClock();_alarmClock.addEventListener(AlarmEvent.TIME_ALARM, OnAlarmClock);_alarmClock.dispatchEvent(_alarmEvent);}private function OnAlarmClock(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();}}}}

好了，测试后结果截图为：