Flex修改DataGrid行颜色以及按行值设置行颜色

发现Flex背景色让行的颜色改变是有些不妥之处，就是在行数较少没有填满当前的DataGrid控件时，就连空行也变了颜色。以下是不本人自定义的一个控件，通过重写drawRowBackground，对绘制的dataIndex进行判断，可以完成设置行的颜色的设置和按值设置指定的颜色：

package widgets.Utility.Control
{
?import flash.display.Sprite;
?import mx.controls.*;
?public class DataGridColored extends DataGrid
?{
??private var _rowColorFunction:Function;
??private var _customed:Boolean;//是否自定义颜色设置
??private var _customerColor:uint=0;//自定义颜色
??public function DataGridColored()
??{
???super();
??}

??public function set rowColorFunction(rowColorFunction:Function):void
??{
???this._rowColorFunction=rowColorFunction;
??}

??public function get rowColorFunction():Function
??{
???return this._rowColorFunction;
??}
??
??public function set customed(customed:Boolean):void
??{
???_customed=customed;
??}
??
??public function get customed():Boolean
??{
???return _customed;
??}
??
??public function set customerColor(customerColor:uint):void
??{
???_customerColor=customerColor;
??}
??
??public function get customerColor():uint
??{
???return _customerColor;
??}
??
??override protected function drawRowBackground(s:Sprite,rowIndex:int,y:Number,height:Number,color:uint,dataIndex:int):void
??{
???if (_customed==true)
???{
????if (this._rowColorFunction != null)
????{
?????if (dataIndex < this.dataProvider.length)
?????{
??????var item:Object=this.dataProvider.getItemAt(dataIndex);//按指定行进行颜色设置
??????color=this._rowColorFunction.call(this,item,color);
?????}
????}
????else
????{
?????if (this._customerColor!=0)
?????{
??????if (dataIndex < this.dataProvider.length)
??????{
???????color=this._customerColor;
??????}
?????}
????}
???}
???super.drawRowBackground(s,rowIndex,y,height,color,dataIndex);
??}
?}
}

使用时注意两个参数：
customed:Boolean;//是否自定义颜色设置
customerColor:uint=0;//自定义颜色
如：
this.dataGrid.customed=true;
this.dataGrid.customerColor=0x7fceff;
也可直接在MXML进行设置

按值设置指定的颜色需要指定外部回调函数rowColorFunction
如：
在MXML设置：rowColorFunction="rowColorFunction"
下面将column1列值为gisconquer的行颜色设置为0xbeff8e

private function rowColorFunction(item:Object,color:uint):uint
{

?if (item['column1'] == "gisconquer") //将column1列值为gisconquer的行颜色设置为0xbeff8e
?{
??return 0xbeff8e;

?} ?return color; }