[AS3]as3鼠标事件startDrag的一个用法实例

[AS3]as3鼠标事件startDrag的一个用法实例

package 
{ 
    import com.ui.Ball; 
    import com.ui.Ship; 
     
    import flash.display.Sprite; 
    import flash.events.MouseEvent; 
 
    public class Main extends Sprite 
    {     
        private var ball:Ball; 
        public function Main():void 
        { 
            init(); 
        } 
        private function init():void 
        { 
            ball = new Ball(); 
            ball.x = 100; 
            ball.y = 100; 
            this.addChild(ball); 
            ball.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown); 
        } 
        private function onMouseDown(event:MouseEvent):void 
        { 
            stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp); 
            stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove); 
        } 
        private function onMouseUp(event:MouseEvent):void 
        { 
            stage.removeEventListener(MouseEvent.MOUSE_UP, onMouseUp); 
            stage.removeEventListener(MouseEvent.MOUSE_MOVE, onMouseMove); 
        } 
        private function onMouseMove(event:MouseEvent):void 
        { 
            ball.x = this.mouseX + (this.mouseX - ball.x); 
            ball.y = this.mouseY + (this.mouseY - ball.y); 
        } 
    } 
}  package{ 
    import com.ui.Ball; 
    import com.ui.Ship; 
     
    import flash.display.Sprite; 
    import flash.events.MouseEvent; 
 
    public class Main extends Sprite 
    {     
        private var ball:Ball; 
        public function Main():void 
        { 
            init(); 
        } 
        private function init():void 
        { 
            ball = new Ball(); 
            ball.x = 100; 
            ball.y = 100; 
            this.addChild(ball); 
            ball.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown); 
        } 
        private function onMouseDown(event:MouseEvent):void 
        { 
            ball.startDrag(); 
            stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp); 
        } 
        private function onMouseUp(event:MouseEvent):void 
        { 
            ball.stopDrag(); 
        } 
    } 
}