Flex学习笔记-时间触发器

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx"
               minWidth="955" minHeight="600"
               creationComplete="init()"
               >
    <s:layout>
        <s:VerticalLayout paddingLeft="20" paddingTop="20"/>
    </s:layout>
        <fx:Script>
            <![CDATA[
                import flash.utils.Timer;
                
                import mx.controls.Alert;
                
                import spark.effects.animation.RepeatBehavior;
                
                
                [Bindable]
                protected var secondsTillDue:int = 10;
                protected var _timer:Timer;
                
                protected function init():void{
                    
                _timer = new Timer(1000);
                
                
                _timer.addEventListener(TimerEvent.TIMER,onTimerTick);
                _timer.start();
                }
                
                protected function onTimerTick(event:TimerEvent):void{
                    
                  secondsTillDue = Math.max(secondsTillDue-1,0);
                  if(secondsTillDue == 0)
                  {
                   effect.play();
                  _timer.stop();
                   see.visible =true;
                  
                  }
                }
            ]]>
        </fx:Script>
    <fx:Declarations>
        <s:GlowFilter id="filter" color="#4e7800" blurX="20" blurY="20"/>
        <s:AnimateFilter id="effect" target="{box}" bitmapFilter="{filter}" duration="1000" repeatCount="0" repeatBehavior="{RepeatBehavior.REVERSE}">
            <s:SimpleMotionPath property="alpha" valueFrom="0" valueTo="1"/>
        </s:AnimateFilter>
                
    </fx:Declarations>
    <s:Label id="labelField" fontWeight="bold" fontSize="14" text="倒计时{secondsTillDue}秒"/>
    <s:Rect id="box" width="200" height="200">
        <s:fill>
            <s:SolidColor color="black"/>
        </s:fill>
    </s:Rect>
    <s:Label id="see" text="触发了" visible="false"/>
    
</s:Application>