[AIR] AS3.0设置屏保功能

package com.controls
{
    import flash.desktop.NativeApplication;
    import flash.events.Event;
    import flash.events.EventDispatcher;
    import flash.events.IEventDispatcher;
    
    /**
     * @author:Frost.Yen
     * @E-mail:871979853@qq.com
     * @create:    2016-6-21 下午3:24:57
     *
     */
    public class ScreenSaver extends EventDispatcher
    {
        static public const START_SAVER:String = "start_saver";
        static public const QUIT_SAVER:String = "quit_saver";
        public function ScreenSaver(target:IEventDispatcher=null)
        {
            super(target);
        }
        public function set scrrenSaverTime(value:Number):void 
        {
            NativeApplication.nativeApplication.idleThreshold = value;
            NativeApplication.nativeApplication.addEventListener(Event.USER_IDLE, handleUserIdle);
            NativeApplication.nativeApplication.addEventListener(Event.USER_PRESENT, handleUserPresent);
        }
        /**
         * 当用户处于空闲状态的时间长度达到 idleThreshold 属性指定的时间时调度。
         */
        private function handleUserIdle(e:Event):void 
        {
            //开始屏保
            this.dispatchEvent(new Event(START_SAVER));
            trace("鼠标离开了多少秒", NativeApplication.nativeApplication.timeSinceLastUserInput);
        }
        
        /**
         * 当操作系统在空闲一段时间后检测到鼠标或键盘活动时调度。
         */
        private function handleUserPresent(e:Event):void 
        {
            //退出屏保
            this.dispatchEvent(new Event(QUIT_SAVER));
            
        }
    }
}

package  
{
    import com.controls.ScreenSaver;
    import flash.display.Sprite;
    import flash.events.Event;
    
    /**
     * ...
     * @author FrostYen
     */
    public class Main extends Sprite 
    {
        private var _saver:ScreenSaver;
        public function Main() 
        {
            _saver = new ScreenSaver();
            _saver.scrrenSaverTime = 0.5;
            _saver.addEventListener(ScreenSaver.START_SAVER, onStartSaver);
            _saver.addEventListener(ScreenSaver.QUIT_SAVER, onQuitSaver);
        }
        
        private function onStartSaver(e:Event):void 
        {
            trace("start_saver");
        }
        
        private function onQuitSaver(e:Event):void 
        {
            trace("quit_saver");
        }
        
        
    }

}