Flex中如何在Tree控件中指定一个自定义的label函数使其返回的标签名字为叶项目的名称的例子

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">

<mx:Script>
<![CDATA[
private function tree_labelFunc(item:XML):String {
var label:String;
switch (item.localName()) {
case "league":
label = item.@title;
break;
case "team":
label = item.@name;
break;
case "stadium":
label = item.name;
}
return label;
}
]]>
</mx:Script>

<mx:XML id="mlb" source="mlb.xml" />

<mx:Tree id="tree"
dataProvider="{mlb.league}"
labelFunction="tree_labelFunc"
width="300"
rowCount="8" />

</mx:Application>

下面是

Download: mlb.xml

<?xml version="1.0" encoding="utf-8"?>
<mlb>
<league id="al" title="American League">
<team name="Baltimore Orioles" />
<team name="Boston Red Sox" />
<team name="Chicago White Sox" />
<team name="Cleveland Indians" />
<team name="Detroit Tigers" />
<team name="Kansas City Royals" />
<team name="Los Angeles Angels of Anaheim" />
<team name="Minnesota Twins" />
<team name="New York Yankees" />
<team name="Oakland Athletics" />
<team name="Seattle Mariners" />
<team name="Tampa Bay Devil Rays" />
<team name="Texas Rangers" />
<team name="Toronto Blue Jays" />
</league>
<league id="nl" title="National League">
<team name="Arizona Diamondbacks" />
<team name="Atlanta Braves" />
<team name="Chicago Cubs" />
<team name="Cincinnati Reds" />
<team name="Colorado Rockies" />
<team name="Florida Marlins" />
<team name="Houston Astros" />
<team name="Los Angeles Dodgers" />
<team name="Milwaukee Brewers" />
<team name="New York Mets" />
<team name="Philadelphia Phillies" />
<team name="Pittsburgh Pirates" />
<team name="San Diego Padres" />
<team name="San Francisco Giants" />
<team name="St. Louis Cardinals" />
<team name="Washington Nationals" />
</league>
</mlb>