[AS3]as3.0写的很赞的Loading类源代码(2)

package net.xueyitong.controls 
{ 
    import com.greensock.TweenLite; 
    import flash.display.Sprite; 
    import flash.display.StageAlign; 
    import flash.events.TimerEvent; 
    import flash.text.TextField; 
    import flash.text.TextFieldAutoSize; 
    import flash.text.TextFormat; 
    import flash.text.TextFormatAlign; 
    import flash.utils.Timer; 
     
    /** 
     * 纯代码的一个圆形Loading组件 
     * 该组件需要com.greensock.TweenLite缓动类库 
     * @author zkl QQ:344209679 
     * 学习交流 CuPlayer.com
     */ 
    public class Loading extends Sprite  
    { 
        //loading的圆点表列 
        private var circles:Array = new Array(); 
        //loading的圆点数 
        private var circleNum:int = 12; 
        //loading的半径 
        private var radius:Number = 20; 
        //loading的圆点的颜色 
        private var color:uint = 0xD4D4D4; 
        //小圆点的半径 
        private var subRadius:Number = 4; 
        //每个圆点之间的延迟计算 
        private var delay:int = 2; 
        private var frameCount:int = 0; 
        //当前圆点的下标 
        private var currentCircleIndex:int = 0; 
        //loading的圆点实例 
        private var currentCircle:LoadingCircle; 
        //loading显示文本域 
        private var percentField:TextField; 
         
        //timer 
        public var frameRate:int; 
        private var loadingTimer:Timer; 
        private var timerPeriod:Number; 
        // 
         
        /** 
         * 创建一个Loading实例 
         * @param   radius :String 半径 
         * @param   color :uint 颜色 
         */ 
        public function Loading(radius:Number = 25, color:uint = 0xD4D4D4, subRadius:Number = 4) { 
            this.radius = radius; 
            this.color = color; 
            this.subRadius = subRadius; 
            init(); 
        } 
        /** 
         * 运行Loading组件 cuplayer.com
         * @param   frameRate : int 帧频 
         */ 
        public function run(frameRate:int = 30):void { 
            percentField.text = ""; 
            this.frameRate = frameRate; 
            timerPeriod = 1000 / frameRate; 
            loadingTimer = new Timer(timerPeriod); 
            loadingTimer.addEventListener(TimerEvent.TIMER, runLoading); 
            loadingTimer.start(); 
        } 
        /** 
         * 停止loading组件 
         */ 
        public function stop():void { 
            loadingTimer.removeEventListener(TimerEvent.TIMER, runLoading); 
            loadingTimer.stop(); 
        } 
        /** 
         * 移除Loading组件 
         */ 
        public function remove():void { 
            loadingTimer.stop(); 
            loadingTimer.removeEventListener(TimerEvent.TIMER, runLoading); 
            for (var i:int = 0; i < this.numChildren; i++ ) { 
                this.removeChild(getChildAt(0)); 
            } 
            this.removeChild(percentField); 
        } 
        /** 
         * 显示loading文本域 一般是百分比进度 
         * @param   per :String 显示的字符串 
         */ 
        public function percent(per:String):void { 
            perpercentField.text = per; 
            percentField.setTextFormat(textFormat()); 
        } 
        /////////////////////////////////////////////////////////////////////////////// 
        // protected 
        protected function runLoading(e:TimerEvent):void { 
            frameCount++; 
            if (frameCount >= delay) { 
                render(); 
            } 
        } 
        //初始化loading,排列每个圆点 
        protected function init():void { 
            var step:Number = Math.PI * 2 / circleNum; 
            var angle:Number; 
            for (var i:int = 0; i < circleNum; i++ ) { 
                currentCircle = new LoadingCircle(subRadius, color); 
                circles.push(currentCircle); 
                this.addChild(currentCircle); 
                angle = step * i; 
                currentCircle.x = Math.cos(angle) * radius; 
                currentCircle.y = Math.sin(angle) * radius; 
                currentCircle.alpha = 0; 
            } 
            createPercentField(); 
        } 
        //缩小 cuplayer.com
        protected function render():void { 
            frameCount = 0; 
            currentCircleIndex++; 
            if ( currentCircleIndex >= circles.length) { 
                currentCircleIndex = 0; 
            } 
            currentCircle = circles[currentCircleIndex]; 
            currentCirclecurrentCircle.scaleX = currentCircle.scaleY 
             = currentCircle.alpha = 1; 
            TweenLite.to(currentCircle, 50 / frameRate, 
            { scaleX:0, scaleY:0, alpha:0 } ); 
        } 
        //进度文本域 
        protected function createPercentField():void { 
            percentField = new TextField(); 
            percentField.width = 40; 
            percentField.height = 16; 
            percentField.x = -20; 
            percentField.y = -8; 
            percentField.autoSize = TextFieldAutoSize.CENTER; 
            percentField.selectable = false; 
            this.addChild(percentField); 
        } 
        //文本格式 
        protected function textFormat():TextFormat { 
            var format:TextFormat = new TextFormat(); 
            format.font = "宋体"; 
            format.size = 12; 
            format.color = this.color; 
            format.align = TextFormatAlign.CENTER; 
            return format; 
        } 
        //protected 
         
         
    }//end class 
         
}//end package 
 
import flash.display.Sprite; 
     
/** 
 * loading组件的小圆圈 
 * @author zkl 
 */ 
class LoadingCircle extends Sprite 
{ 
    public function LoadingCircle(radius:Number = 4, color:uint = 0x7B7B7B) { 
        this.graphics.beginFill(color); 
        this.graphics.drawCircle( -radius / 2, -radius / 2, radius); 
        this.graphics.endFill(); 
    } 
         
}//end class