文章摘要
本文主要介绍了如何通过Flex中的GridItemRenderer实现对行选择功能的实现。在prepare方法中，通过获取grid.dataGrid.selectedItems对象，判断当前行是否被选中，并相应地设置radio_button的selected属性为true或false。需要注意的是，radio_button被禁用，因此用户无法通过点击来选择或取消选择行，此功能只能通过代码实现。
<?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>