编辑tree节点。添加，删除。

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
<!--[CDATA[
import mx.collections.XMLListCollection;
[Bindable]
//创建E4X的XML对象
private var doc:XML =
<folder label="我的文档" data="doc">
<folder label="我的图片" data="pic"/>
<folder label="我的音乐" data="music">
<Pfolder label="PlaceNearBy.mp3" />
<Pfolder label="solo.mp3" />
<Pfolder label="流行乐" isBranch="true" data="pop"/>
</folder>
<folder label="我的应用程序" data="app"/>
<folder label="我的视频" data="video"/>
</folder>;
[Bindable]
private var docData:XMLListCollection = new XMLListCollection(doc.folder);
private function addDoc():void {
var newNode:XML = <Pfolder/>;
newNode.@label = docName.text;
var pFolder:XMLList =doc.folder.(@label == "我的音乐");
if( pFolder.length() > 0 ) {
//E4X 增加节点命令
pFolder[0].appendChild(newNode);
docName.text = "";
}
}
private function removeDoc():void {
var node:XML = XML(tree.selectedItem);
if( node == null )
return;
if( node.localName() != "Pfolder" )
return;
var children:XMLList = XMLList(node.parent()).children();
for(var i:Number=0; i < children.length(); i++) {
//E4X匹配表达式
if( children[i].@label == node.@label ) {
//E4X 删除节点命令
delete children[i];
}
}
}
]]-->
</mx:Script>
<mx:Tree id="tree" showRoot="true" fontSize="12" top="72" left="50" dataProvider="{docData}" labelField="@label" height="225" width="300"/>
<mx:VBox>
<mx:HBox>
<mx:Button label="添加文件到：我的音乐" fontSize="12" click="addDoc();"/>
<mx:TextInput id="docName" fontSize="12"/>
</mx:HBox>
<mx:Button label="删除文件" fontSize="12" click="removeDoc();"/>
</mx:VBox>
</mx:Application>