[Flex]Flex键盘事件随机数抽奖代码示例

 [Flex]Flex键盘事件随机数抽奖代码示例

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="init()"> 
<mx:Script> 
    <!--[CDATA[  
        private var srcArray:Array = new Array();  
        private var isCirle:Boolean =false;  
        private var currIndex:int;      //记录中奖人信息下标  
        private function init():void  
        {  
            //极酷播放器提示：初始化生成1-1000的源数据  
            for(var i:uint = 1; i<=1000; i++)   
            {  
                srcArray.push(i);  
            }  
            //极酷播放器提示：注册键盘监听事件  
            this.addEventListener(KeyboardEvent.KEY_DOWN,onKeyDown);  
        }  
          
        private function onKeyDown(e:KeyboardEvent):void  
        {  
            if(e.keyCode == Keyboard.SPACE)  
            {  
                if(isCirle) //抽奖滚动停止 并记录并删除源数据中的值已保证不会重复  
                {  
                    this.removeEventListener(Event.ENTER_FRAME,onEnterFrame);  
                    txtAward.text += srcArray[currIndex].toString() +",";  
                      
                    srcArray.splice(currIndex,1);  
                    isCirle = false;  
                }  
                else   
                {  
                    //极酷播放器提示：添加抽奖动画事件  
                    this.addEventListener(Event.ENTER_FRAME,onEnterFrame);  
                    isCirle = true;  
                }  
            }  
        }  
        private function onEnterFrame(e:Event):void  
        {  
            //通过生成随机下标 取值已保证不会重复  
            currIndex = int(Math.random() * srcArray.length);   
            this.txtDisplay.text = srcArray[currIndex];  
        }  
    ]]--> 
</mx:Script> 
    <mx:Label x="140" y="107" text="0" width="129" fontSize="21" color="#A0588D" fontWeight="bold" textAlign="center" enabled="true" id="txtDisplay"/> 
    <mx:Label x="140" y="33" text="空格键开始/停止摇奖"/> 
    <mx:TextArea x="69" y="156" height="258" width="286" id="txtAward" wordWrap="true" editable="false" color="#170838" backgroundColor="#B2B7CD" fontWeight="bold" fontSize="15"/> 
</mx:Application>