[]List组件拖动浏览时item会出现重叠的现象

module list.datasource {

    import List = laya.ui.List;



    export class ListDataSourceMediator {

        constructor() {

        }



        public setUp():void

        {

            var list: List = new List();



            // 渲染的item

            list.itemRender = ListDataSourceItem;



            // 设置行列显示的item个数

            list.repeatX = 1;

            list.repeatY = 4;



            // list居中显示

            list.x = (Laya.stage.width - ListDataSourceItem.WID) / 2;

            list.y = (Laya.stage.height - ListDataSourceItem.HEI * list.repeatY) / 2;



            // 使用但隐藏滚动条,滚动条水平滚动

            list.vScrollBarSkin = ""; // list.vScrollBarSkin 滚动条垂直滚动



            //item对象是否可选以及选中后可做的操作

            list.selectEnable = true;

            list.selectHandler = new Handler(this, this.onSelect);



            // 滚动条的橡皮筋操作：回弹时间及弹性距离

            list.scrollBar.elasticBackTime = 200;

            list.scrollBar.elasticDistance = 5;



            Laya.stage.addChild(list);

            // 设置数据项为对应图片的路径

            var data: Array<string> = [];

            for (var i: number = 0; i < 2; ++i) {

                data.push("img_common_pinzhi0.png");

                data.push("img_common_pinzhi1.png");

                data.push("img_common_pinzhi2.png");

                data.push("img_common_pinzhi3.png");

                data.push("img_common_pinzhi4.png");

                data.push("img_common_pinzhi5.png");

            }



            // item使用的列表数据

            list.dataSource = data;



        }



        private onSelect(index: number): void {

            console.log("当前选择的索引：" + index);

        }

    }



    import Box = laya.ui.Box;

    import Image = laya.ui.Image;

    import Label = Laya.Label;



    export class ListDataSourceItem extends Box {

        public static WID: number = 200;

        public static HEI: number = 20;

        // private _img: Image = null;

        private _lb:Label = null;



        constructor() {

            super();



            this._lb = new Label();

            this._lb.size(ListDataSourceItem.WID, ListDataSourceItem.HEI);

            this.addChild(this._lb);

            // this._img = new Image();

            // this._img.size(ListDataSourceItem.WID, ListDataSourceItem.HEI);

            // this.addChild(this._img);

        }



        public set dataSource(path: string) {

            // this._img.skin = path;

            this._lb.text = path;



        }

    }

}