對于從Sprite類繼承來的對象，要實現拖放當然是Flash/Flex學習筆記(13)：對象拖動(startDrag/stopDrag)?里講的方法最方便，但是對于不是從Sprite類繼承得來的對象，這startDrag/stopDrag是不能用的，這時候只能采用最通常用做法：利用Mouse_Down,Mouse_UP,Mouse_Move事件來處理

注意：對象的Mouse_Move事件，只有當鼠標在對象上時才能被監聽，如果用戶鼠標移動過快，超出了對象的范圍，該事件就不起作用了，所以監聽Mouse_Move事件時，應該監聽stage對象的Mouse_Move事件，而非對象本身的（詳情見下面的代碼）

package {import flash.display.Sprite;import flash.events.MouseEvent;import flash.ui.MouseCursor;import flash.ui.Mouse;public class MouseMoveDrag extends Sprite {private var offsetX:Number;private var offsetY:Number;private var arrBalls:Array;private var _draggedBall:Ball;public function MouseMoveDrag():void {arrBalls=new Array(7);for (var i:uint=0; i<arrBalls.length; i++) {arrBalls[i]=new Ball(20+Math.random()*30,Math.random()*0xffffff);arrBalls[i].x=stage.stageWidth*Math.random();arrBalls[i].y=stage.stageHeight*Math.random();arrBalls[i].addEventListener(MouseEvent.MOUSE_DOWN, MouseDownHandler);arrBalls[i].addEventListener(MouseEvent.MOUSE_UP, MouseUpHandler);arrBalls[i].addEventListener(MouseEvent.MOUSE_OVER,MouseOverHandler);arrBalls[i].addEventListener(MouseEvent.MOUSE_OUT,MouseOutHandler);addChild(arrBalls[i]);}}function MouseOverHandler(e:MouseEvent):void {Mouse.cursor=MouseCursor.BUTTON;}function MouseOutHandler(e:MouseEvent):void {Mouse.cursor=MouseCursor.AUTO; }//開始移動function MouseDownHandler(e:MouseEvent):void {offsetX=e.localX;offsetY=e.localY; _draggedBall = e.target as Ball;stage.addEventListener(MouseEvent.MOUSE_MOVE, stageMouseMoveHandler);}//停止拖動function MouseUpHandler(e:MouseEvent):void {_draggedBall = null;//拖動完成后，移除舞臺的Mouse_Move監聽stage.removeEventListener(MouseEvent.MOUSE_MOVE, stageMouseMoveHandler);}function stageMouseMoveHandler(e:MouseEvent):void {//trace(e.target);var _ball:Ball=e.target as Ball;if (_ball!=null) {//設置新的坐標_ball.x=mouseX-offsetX;_ball.y=mouseY-offsetY;}else {//trace("您拖得太快了!" + _draggedBall.toString());if (_draggedBall!=null){_draggedBall.x=mouseX-offsetX;_draggedBall.y=mouseY-offsetY;}}}} }

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