Flex中DataGrid实现列（包括头部）中加入CheckBox全选功能

在DataGrid中实现列中加入CheckBox这种用法很常见，项目中也经常会用到，在网上搜了下基本就是实现itemRender.但是 感觉网上提供的实现上好些地方都是多余的 经过自己的改造感觉还行 附上代码，同时希望大家举一反三 能实现添加其他组件到DataGrid列中

贴出自己改造过的：

CheckBoxHeaderRenderer.as

package 
{

import flash.events.Event;
import flash.events.MouseEvent;

import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.controls.CheckBox;
import mx.controls.DataGrid;
import mx.events.DataGridEvent;

public class CheckBoxHeaderRenderer extends CheckBox
{
private var sele:String;
public function CheckBoxHeaderRenderer()
{
super();
this.addEventListener(Event.CHANGE, clickHandlers);
}

override public function set data(value:Object):void
{
DataGrid(listData.owner).addEventListener
                                    (DataGridEvent.HEADER_RELEASE,sortEventHandler);
this.selected=this.sele=="true"?true:false;
}

private function sortEventHandler(event:DataGridEvent):void
{
if (event.itemRenderer == this)
event.preventDefault();
}

protected function clickHandlers(event:Event):void
{
sele=(event.currentTarget.selected).toString();
var a:ArrayCollection=DataGrid(listData.owner).dataProvider as ArrayCollection;
for(var i:int=0;i<a.length;i++){

(DataGrid(listData.owner).dataProvider as ArrayCollection)
                                   .getItemAt(i).selected=(event.currentTarget.selected).toString();
}
(DataGrid(listData.owner).dataProvider as ArrayCollection).refresh();
}

}
}  

CheckBoxItemDataRenderer.as

package {import flash.events.Event;import mx.collections.ArrayCollection;import mx.controls.CheckBox;import mx.controls.DataGrid;public class CheckBoxItemDataRenderer extends CheckBox{private var currentData:Object; //保存当前一行值的对象public function CheckBoxItemDataRenderer(){super();this.addEventListener(Event.CHANGE, changeHandler);}override public function set data(value:Object):void{this.currentData= value;this.selected = value.selected == "true"?true:false;}protected function changeHandler(event : Event) : void{currentData.selected = this.selected.toString();}/*override public function get data():Object{return currentData;}*/}}

DataGrid_Checkbox.mxml

<?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"   xmlns:dataGrid="*"   minWidth="955" minHeight="600" creationComplete="getaa()"><fx:Script><![CDATA[import mx.collections.ArrayCollection;import mx.controls.Alert;[Bindable]private var data_myDataGrid:ArrayCollection=new ArrayCollection();private function headerClickHandler(event : Event) : void{/* for each(var obj: Object in data_myDataGrid){obj.selected = String(event.currentTarget.selected);}data_myDataGrid.refresh(); */}private function getaa():void{var obj:Object=new Object();obj.labe="1";obj.data="a";obj.selected="false";var obj2:Object=new Object();obj2.labe="2";obj2.data="b";obj2.selected="false";var obj3:Object=new Object();obj3.labe="3";obj3.data="c";obj3.selected="false";var obj4:Object=new Object();obj4.labe="4";obj4.data="a";obj4.selected="false";var obj5:Object=new Object();obj5.labe="5";obj5.data="b";obj5.selected="false";var obj6:Object=new Object();obj6.labe="6";obj6.data="c";obj6.selected="false";var obj7:Object=new Object();obj7.labe="7";obj7.data="a";obj7.selected="false";var obj8:Object=new Object();obj8.labe="8";obj8.data="b";obj8.selected="false";var obj9:Object=new Object();obj9.labe="9";obj9.data="c";obj9.selected="false";data_myDataGrid.addItem(obj);data_myDataGrid.addItem(obj3);data_myDataGrid.addItem(obj2);data_myDataGrid.addItem(obj4);data_myDataGrid.addItem(obj5);data_myDataGrid.addItem(obj6);data_myDataGrid.addItem(obj7);data_myDataGrid.addItem(obj8);data_myDataGrid.addItem(obj9);}protected function button1_clickHandler(event:MouseEvent):void{for(var i:int=0;i<data_myDataGrid.length;i++){if(data_myDataGrid.getItemAt(i).selected=='true'){Alert.show(data_myDataGrid.getItemAt(i).labe);}}}]]></fx:Script><mx:DataGrid dataProvider="{data_myDataGrid}" x="10" y="10"><mx:columns><mx:DataGridColumn dataField="labe" headerText="Label" /><mx:DataGridColumn dataField="data" headerText="Data" /><mx:DataGridColumndataField="selected" headerText="Select" itemRenderer="CheckBoxItemDataRenderer" headerRenderer="CheckBoxHeaderRenderer"  /></mx:columns></mx:DataGrid> <mx:Button click="button1_clickHandler(event)"/></s:Application>