Flex4 DataGrid中嵌入RadioButton实现思路及代码

s:DataGrid id="viewDg" width="100%" height="100%" fontFamily="微软雅黑" 
horizontalScrollPolicy="off" borderVisible="false" 
dataProvider="{viewList}"> 
s:columns> 
s:ArrayList> 
s:GridColumn width="{wid*0.02}" resizable="false" 
itemRenderer="Module_SchoolView.RadioButtonGridItemRenderer"/> 


s:GridColumn width="{wid*0.25}" headerText="名称" dataField="xysj02" resizable="false"/> 

s:GridColumn width="{wid*0.25}" headerText="地名" dataField="xysj02name" resizable="false"/> 

s:GridColumn width="{wid*0.35}" headerText="URL" dataField="xysj04" resizable="false"/> 

s:GridColumn width="{wid*0.13}" headerText="备注" dataField="xysj05" resizable="false"/> 
/s:ArrayList> 
/s:columns> 
/s:DataGrid>

?xml version="1.0" encoding="utf-8"?> 
s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" 
xmlns:s="library://ns.adobe.com/flex/spark" 
xmlns:mx="library://ns.adobe.com/flex/mx"> 
fx:Declarations> 
!-- 将非可视元素（例如服务、值对象）放在此处 --> 
/fx:Declarations> 
fx:Script> 
![CDATA[ 

//---------------------------------------------------------------------------------------------------------- 

override public function prepare(hasBeenRecycled:Boolean):void 
{ 
super.prepare( hasBeenRecycled ); 

// We make the radio button mimic the selection status of the whole row. 
const selected_items: Vector.Object> = grid.dataGrid.selectedItems; 

if( null == selected_items ) 
{ 
radio_button.selected = false; 
return; 
} 

if( -1 != selected_items.indexOf( data ) ) 
radio_button.selected = true; 
else 
radio_button.selected = false; 
} 

//---------------------------------------------------------------------------------------------------------- 

]]> 
/fx:Script> 

!--The radio button is only a visual indicator for whether the row is selected or not. 
The "selected" property of the radio_button will be controlled by the "prepare" function. 
The radio_button should not be allowed any user interaction. Hence disabling it.--> 
s:RadioButton id="radio_button" 
label="" 
enabled="false" 

horizontalCenter="0" verticalCenter="0" /> 

/s:GridItemRenderer>