防止Tree组件的非叶节点被选中.

<?xml version="1.0" encoding="utf-8"?>

<!-- http://blog.flexexamples.com/2008/01/16/preventing-branches-from-being-selected-in-a-flex-tree-control/ -->

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

layout="vertical"

verticalAlign="middle"

backgroundColor="white">

<mx:Script>

<![CDATA[

import mx.events.ListEvent;

private function tree_itemClick(evt:ListEvent):void {

var item:Object = evt.currentTarget.selectedItem

if (tree.dataDescriptor.isBranch(item)) {

tree.selectedItem = null;

}

}

]]>

</mx:Script>

<mx:XML id="dp">

<root>

<node label="Parent 1">

<node label="Child 1" />

<node label="Child 2">

<node label="Grandchild 1" />

<node label="Grandchild 2" />

</node>

<node label="Child 3" />

<node label="Child 4" />

</node>

</root>

</mx:XML>

<mx:Tree id="tree"

dataProvider="{dp}"

showRoot="false"

labelField="@label"

width="200"

itemClick="tree_itemClick(event);" />

</mx:Application>

来自：http://blog.flexexamples.com/2008/01/16/preventing-branches-from-being-selected-in-a-flex-tree-control/