Flex 自定义DataGrid实现根据条目某一属性值改变背景颜色

自定义拓展的DataGrid（as类）代码如下：

package czgh.components
{
import flash.display.Sprite;
import mx.controls.DataGrid;
import mx.core.UIComponent;
public class OptionalDataGrid extends DataGrid
{
private var _rowColorFunction:Function;
private var _customed:Boolean;
private var _customerColor:uint=0;
public function OptionalDataGrid()
{
super();
}
override protected function drawRowBackground(s:Sprite, rowIndex:int, y:Number, height:Number, color:uint, dataIndex:int):void
{
color=0XFFFFFF;
if(this._rowColorFunction != null)
{
if (dataIndex < this.dataProvider.length)
{
var item:Object=this.dataProvider.getItemAt(dataIndex);//设定颜色
color=this._rowColorFunction.call(this, item, color);
}
}
super.drawRowBackground(s, rowIndex, y, height, color, dataIndex);
}
override protected function drawHeaderBackground(headerBG:UIComponent):void
{
headerBG.setStyle("borderVisible","false");
}
public function set rowColorFunction(rowColorFunction:Function):void
{
this._rowColorFunction=rowColorFunction;
}
public function get rowColorFunction():Function
{
return this._rowColorFunction;
}
}
}

在mxml中实现自定义的datagrid并使用 其rowColorFunction方法

//通过比较每条记录中dataField为act和stand的大小决定该条记录的背景颜色
private function setCustomColor(item:Object, color:uint):uint
{
if (Number(item["act"])<Number(item["stand"]))
{
return 0x7bbfea;
}
return color;
}