Flex：实现Mac系统下滑式Alert窗口

package
{
    import flash.display.Sprite;
    import mx.controls.Alert;
    import mx.core.Application;
    import mx.effects.Move;
    import mx.effects.Parallel;
    import mx.effects.WipeUp;
    import mx.managers.PopUpManager;
    
    public class KAlert
    {
        public function KAlert()
        {
            super();
        }
        
        public static function show(text:String,modal:Boolean = false):void{
            var alert:Alert = new Alert();
            setAppleStyle(alert);
            setOpenEffect(alert);
            
            alert.text = text;
            var parent:Sprite = Sprite(Application.application);   
            PopUpManager.addPopUp(alert, parent, modal);
            alert.x = Application.application.width/2-100;
            alert.setActualSize(alert.getExplicitOrMeasuredWidth(), alert.getExplicitOrMeasuredHeight());            
        }
        
        //设置弹出窗口样式
        private static function setAppleStyle(alert:Alert):void{
            alert.setStyle("headerHeight",0);
            alert.setStyle("cornerRadius",0);
            alert.setStyle("shadowDirection","right");
            alert.setStyle("backgroundAlpha","1");
            alert.setStyle("backgroundColor","#dfe1e2");
            alert.setStyle("color","#333333");
            alert.setStyle("borderThicknessLeft","0");
            alert.setStyle("borderThicknessRight","0");
            alert.setStyle("borderThicknessTop","0");
            alert.setStyle("borderThicknessBottom","0");
            alert.setStyle("fontSize","12");
        }
        
        //设置弹出动画
        private static function setOpenEffect(alert:Alert):void{
            var wipeUp:WipeUp = new WipeUp(); //Wipe效果，方向向上
            var move:Move = new Move(); //移定效果
            var parallel:Parallel = new Parallel(); //加入其中的效果会被并发执行
            parallel.addChild(move);
            parallel.addChild(wipeUp);
            
            //设置弹出框在正中央
            move.xFrom = Application.application.width/2-100;
            move.xTo = Application.application.width/2-100;
            
            //弹出时从－100移动到100，同时wipeUp
            move.yFrom = -100;
            move.yTo = -1;
            //动画执行时间为300毫秒
            wipeUp.duration = 300;
            move.duration=300;
            //在当前控件被加入舞台时执行
            alert.setStyle("addedEffect",parallel)
        }
    }
}

引自：http://yecon.blog.hexun.com/29488118_d.html