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>