在ActionScript中响应MouseEvent

在上一篇中,事件的响应是由addEventListener来实现的,鼠标事件的响应也不例外,但是不同的是事件不一样了,在使用完事件后,要记得移除相应的事件
在这一类中用到了对象的创建,addChild,MoveTo,LineTo,Fill,EndFill()等方法

package 
{
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    

    public class MouseEvent extends Sprite
    {
        private var _sprint:Sprite;
        public function MouseEvent()
        {            
            super();
         
            _sprint=new Sprite();
            addChild(_sprint);
            _sprint.graphics.beginFill(0xffffff);
            _sprint.graphics.drawRect(0,0,500,400);
            _sprint.graphics.endFill();
            
            _sprint.addEventListener(flash.events.MouseEvent.MOUSE_DOWN,OnMouseDown);
            
            _sprint.addEventListener(flash.events.MouseEvent.MOUSE_UP,OnMouseUp);
         
            
        }
        
        public function OnMouseDown(event:flash.events.MouseEvent):void
        {
            _sprint.graphics.lineStyle(1,2,1);
            _sprint.graphics.moveTo(mouseX,mouseY);
            _sprint.addEventListener(flash.events.MouseEvent.MOUSE_MOVE,OnMouseMove);
            
        }
        public function OnMouseUp(event:flash.events.MouseEvent):void
        {
            _sprint.removeEventListener(flash.events.MouseEvent.MOUSE_MOVE,OnMouseMove);
        }
        
        public function OnMouseMove(event:flash.events.MouseEvent):void
        {
            _sprint.graphics.lineTo(mouseX,mouseY);
        }
        
    }
}