[Flex] 组件Tree系列 —— 运用LabelFunction hasChildren getChildren设置Tree包含节点个数

mxml:

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--功能描述：运用LabelFunction hasChildren getChildren设置Tree包含节点个数-->
 
 <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                xmlns:s="library://ns.adobe.com/flex/spark"
                xmlns:mx="library://ns.adobe.com/flex/mx" width="1080" height="1920" addedToStage="application1_addedToStageHandler(event)" resize="application1_resizeHandler(event)">
 
     <fx:Script>
         <![CDATA[
             import mx.events.ResizeEvent;
 
             protected function tree_labelFunction(item:Object):String
             {
                 var label:String = item.@label;
                 if (tree.dataDescriptor.hasChildren(item)) {
                     label += " (" + tree.dataDescriptor.getChildren(item).length + ")";
                 }
 
                 return label;
 
             }
 
             protected function application1_addedToStageHandler(event:Event):void
             {
                 trace(stage.stageWidth,stage.width,stage.stageHeight,stage.height);
                 this.width = 1080;
                 this.height = 1920;
                 trace(stage.stageWidth,stage.width,stage.stageHeight,stage.height);
                 trace(this.width,this.height);
             }
 
             protected function application1_resizeHandler(event:ResizeEvent):void
             {
                 //this.width = 1080;
                 //this.height = 1920;
                 trace(this.width,this.height);
             }
 
         ]]>
     </fx:Script>
 
     <fx:Declarations>
         <!-- 将非可视元素（例如服务、值对象）放在此处 -->
         <fx:XML id="data" xmlns="">
             <data>
                 <actor label="周星驰" clickEnabled="false">
                     <year label="1988">
                         <item label="《霹雳先锋》香港票房8916612 " clickEnabled="false"/>
                         <item label="《捕风汉子》香港票房3149395 " />
                         <item label="《最佳女婿》香港票房5807710 " />
                     </year>
                     <year label="1989">
                         <item label="《龙在天涯》香港票房6809853 " clickEnabled="false"/>
                         <item label="《义胆群英》香港票房7913329 " />
                         <item label="《流氓差婆》香港票房5624622 " />
                         <item label="《风雨同路》香港票房9335299 " />
                     </year>
                     <year label="1990 ">
                         <item label="《望夫成龙》香港票房13703364 " />
                         <item label="《咖喱辣椒》香港票房15777856 " />
                         <item label="《小偷阿星》香港票房7968106 " />
                         <item label="《师兄撞鬼》香港票房12128944 " clickEnabled="false"/>
                         <item label="《赌圣》香港票房41326156 " />
                         <item label="《无敌幸运星》香港票房18799869" />
                         <item label="《江湖最后一个大佬》香港票房5495811 " />
                     </year>
                 </actor>
                 <actor label="李连杰">
                     <year label="1992">
                         <item label="笑傲江湖之东方不败（1992）" clickEnabled="false" />
                         <item label="黄飞鸿之二男儿当自强（1992）" />
                         <item label="黄飞鸿之三狮王争霸（1992）" />
                     </year>
                     <year label="1993">
                         <item label="方世玉Ⅱ万夫莫敌（1993）" />
                         <item label="倚天屠龙记之魔教教主（1993）" />
                         <item label="黄飞鸿之铁鸡斗蜈蚣（1993）" />
                         <item label="太极张三丰（1993）" />
                     </year>
                     <year label="1994">
                         <item label="新少林五祖（1994）" />
                         <item label="精武英雄（1994）" />
                         <item label="中南海保镖（1994） " />
                         <item label="给爸爸的信（1995" />
                     </year>
                     <year label="1995">
                         <item label="鼠胆龙威（1995）" />
                         <item label="给爸爸的信（1995" />
                     </year>
                 </actor>
             </data>
         </fx:XML>
     </fx:Declarations>
     <mx:Tree id="tree" dataProvider="{data}" labelField="@label" showRoot="false" width="320" labelFunction="tree_labelFunction"/>
 </s:Application>