拖拽类

来源：互联网发布：淘宝福利图2000张下载编辑：程序博客网时间：2024/06/06 20:28

package game.help
{
public class DragUtil
{
  public function DragUtil()
  {
  }
       /**
         * 开始拖拽
         * */
        public static function dragHandler(event:MouseEvent):void
        {
            // 定义拖拽挂载数据源
            var dsragSource:DragSource = new DragSource();
            // 定义拖拽图标
            var copy:Image = new Image();
            // 拖拽对象
            var target:Image = event.currentTarget as Image;

            // 添加拖拽数据源数据
            dsragSource.addData(target, "img");
            dsragSource.addData(event.localX, "x");
            dsragSource.addData(event.localY, "y");

            // 拖拽图标
            copy.source = new Bitmap(getBitmapData(target.content));
            // 执行拖拽
            DragManager.doDrag(target, dsragSource, event, copy);
        }
        /**
         * 进入拖放区域
         * */
        public static function dragEnterHandler(event:DragEvent):void
        {
            // 进入区域, 设置状态为允许拖放
            if (event.dragSource.hasFormat("img"))
                DragManager.acceptDragDrop(event.target as UIComponent);
        }
        /**
         * 释放拖拽
         * */
        public static function dragDropHandler(event:DragEvent):void
        {
            var img:Image = event.dragSource.dataForFormat("img") as Image;
            // 处理图片放置位置
            img.x = event.currentTarget.mouseX - (event.dragSource.dataForFormat("x") as Number);
            img.y = event.currentTarget.mouseY - (event.dragSource.dataForFormat("y") as Number);
        }
        /**
         * 获取图片信息
         * */
        private static function getBitmapData(target:DisplayObject):BitmapData
        {
            var res:BitmapData = new BitmapData(target.width, target.height);
            res.draw(target);
            return res;
        }
}
}