Flex tree增加，删除，查询并定位节点

<?xml version="1.0" encoding="utf-8"?>
<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" minWidth="955" minHeight="600"
>
<fx:Script>
<![CDATA[
import mx.collections.XMLListCollection;
import mx.controls.Alert;

[Bindable]
[Embed(source="images/open.png")]
public var folderOpen:Class;

[Bindable]
[Embed(source="images/close.png")]
public var folderClose:Class;

[Bindable]
[Embed(source="images/file.png")]
public var fileInfo:Class;

[Bindable]
private var company:XML=
<department>
<department name="部门A">
<department name="小A" />
<department name="小B" />
</department>

<department name="部门B">
<department name="小C">
<department name="abc">
<department name="efg"/>
</department>
<department name="opqr"/>
<department name="小D">
<department name="ff"/>
</department>
</department>
</department>
</department>;

[Bindable]
private var companyData:XMLListCollection=new XMLListCollection(company.department);

private function addNode():void
{
// 新建节点
var newNode:XML=<employee/>;
newNode.@name=empName.text;
// 添加节点
var xml:XML=XML(tree1.selectedItem);
if (xml.length() > 0)
{
xml[0].appendChild(newNode);
tree1.expandChildrenOf(tree1.selectedItem,true);
}
}

private function removeNode():void
{
if (tree1.selectedItem != null)
{
var node:XML=XML(tree1.selectedItem);
Alert.show("根节点不能删除!","[错误]");
//if(tree.dataDescriptor.root){
///Alert.show("根节点不能删除!","[错误]");
//return;
//}
var nodeP:XML=node.parent();
var childrenList:XMLListCollection=new XMLListCollection(XMLList(nodeP).children());
var i:Number=childrenList.getItemIndex(node);
childrenList.removeItemAt(i);
if(childrenList.length == 0)
tree1.selectedItem = nodeP;
else{
if(i == childrenList.length)
i = i - 1;
tree1.selectedItem = childrenList.getItemAt(i)
}

}else{
Alert.show("请选中一个节点再进行删除！");
}
}

/*
* 根据节点名字模糊查询
*/
private function findNode(key:String):void {
//descendants()返回除了根节点以外的所有节点,然后根据条件筛选符合条件的结果集
var list:XMLList  = company.descendants().(@name.indexOf(key) != -1);
expandParents(list[0]);
tree1.selectedItem = list[0];
}
/*
* 展开
*/
private function expandParents(xmlNode:XML):void {
while (xmlNode.parent() != null) {
xmlNode = xmlNode.parent();
tree1.expandItem(xmlNode,true, false);
}
}

//展开所有
private function expandAll():void {
tree1.expandChildrenOf(tree1.dataProvider[0],true);
}

//收起所有
private function closeAll():void {
tree1.expandChildrenOf(tree1.dataProvider[0],false);
}

]]>
</fx:Script>
<s:layout>
<s:HorizontalLayout horizontalAlign="center" verticalAlign="middle"/>
</s:layout>
<s:Panel title="实现添加和删除节点"
width="450"
height="450"
>
<s:layout>
<s:HorizontalLayout/>
</s:layout>
<mx:Tree id="tree1"
dataProvider="{company}"
labelField="@name"
height="300" showRoot="false"
width="260"
defaultLeafIcon="{fileInfo}"
folderOpenIcon="{folderOpen}"
folderClosedIcon="{folderClose}"
/>
<mx:VBox>
<s:Button label="展开所有" click="expandAll()"/>
<s:Button label="关闭所有" click="closeAll()"/>
<mx:Button label="删除节点" click="removeNode();"/>
<mx:HBox>
<s:TextInput id="empName"
width="60"
click="{empName.text = ''}"
prompt="新节点名"
/>
<mx:Button label="添加节点"
click="addNode();"/>
</mx:HBox>
<mx:HBox>
<s:TextInput id="keyName"
width="60"
prompt="关键字"/>
<mx:Button label="查找节点"
click="findNode(keyName.text)"/>
</mx:HBox>
</mx:VBox>
</s:Panel>
</s:Application>