cocos-js listview笔记

var HelloWorldLayer = cc.Layer.extend({    sprite:null,    ctor:function () {        this._super();        var listView = new ccui.ListView();        // set list view ex direction        listView.setDirection(ccui.ScrollView.DIR_VERTICAL);        listView.setTouchEnabled(true);        listView.setBounceEnabled(true);        listView.setContentSize(cc.size(240, 130));        listView.x = 200;        listView.y =200;        listView.addEventListener(this.selectedItemEvent, this);        this.addChild(listView);        var default_item = new ccui.Layout();        default_item.setTouchEnabled(true);        default_item.setContentSize(cc.size(300,30));        default_item.width = listView.width;        //default_item.addChild(default_button);        // set model        listView.setItemModel(default_item);        for (var i = 0; i < 20; ++i) {            listView.pushBackDefaultItem();//注意这一行，相当重要！！！
//如果不写这一句，就不会触发listview的监听事件        }        for(var i=0;i<20;i++){            var lblMenu=new cc.LabelTTF(i.toString(),"Arial",36);            var lblLayer=new ccui.Layout();            lblMenu.setContentSize(cc.size(100,30));            lblMenu.width=80;            lblMenu.x=50;            lblMenu.y=-30*i;            lblLayer.addChild(lblMenu);            listView.insertCustomItem(lblLayer);        }        // 设置重力，不知道有什么用，注释后无影响        listView.setGravity(ccui.ListView.GRAVITY_CENTER_VERTICAL);    },    selectedItemEvent: function (sender, type) {        cc.log("type:"+type);//type类型为0,1        switch (type) {            case ccui.ListView.EVENT_SELECTED_ITEM://选中item项                var listViewEx = sender;                cc.log("select child index = " + listViewEx.getCurSelectedIndex());                break;            case ccui.ListView.ON_SELECTED_ITEM_END://单击ITEM项（没有拉动列表滚动）                cc.log("ccui.ListView.ON_SELECTED_ITEM_END");                break;            default:                break;        }    }});