改变datagrid的背景色

1.创建一个扩展自 mx.controls.DataGrid 的类。这个类可以是MXML文件或者ActionScript文件，你可以根据自己的习惯创建。

2.覆写 protected 方法 drawRowBackground ：

 程序代码

override protected function drawRowBackground(s:Sprite, rowIndex:int, y:Number, height:Number, color:uint, dataIndex:int):void
   {
         // 这里可以做一些对数据的判断，然后更改相应的颜色。比如color = 0xFF0000; 
        // 调用super函数来执行更改。
        super.drawRowBackground(s,rowIndex,y,height,color,dataIndex);
    }

3.在你的程序中用你新建的类替代 <mx: DataGrid>。

在 drawRowBackground 方法中你可以对数据做一些判断。dataIndex 参数可以用来查看dataProvider 中某一行所显示的数据。例如：假设你想要将数值大于1000的行都显示为绿色：

 程序代码

var item:Object = (dataProvider as ArrayCollection).getItemAt(dataIndex);
if( item.quantity > 1000 ) color = 0x00FF00;

具体例子：

首先写自定义类  继承自DataGrid

package BaseUI
{
    import flash.display.Sprite;
    import mx.controls.DataGrid;
    public class CustomerDataGrid extends DataGrid
    {
        private var _rowColorFunction:Function;   //用于在外部能通过指定一个方法 去实现改变列的背景色

        public function CustomerDataGrid()
        {
            super();
        }
        public function set rowColorFunction(f:Function):void 
        { 
            this._rowColorFunction = f; 
        } 
        public function get rowColorFunction():Function 
        { 
            return this._rowColorFunction; 
        }

         //复写该方法
        override protected function drawRowBackground(s:Sprite,rowIndex:int,y:Number, height:Number, color:uint, dataIndex:int):void 
        { 
            if( this.rowColorFunction != null ){ 
                if( dataIndex < this.dataProvider.length ){ 
                    var item:Object = this.dataProvider.getItemAt(dataIndex); 
                    color = this.rowColorFunction.call(this, item, color); 
                } 
            }            
            super.drawRowBackground(s, rowIndex, y, height, color, dataIndex); 
        } 
    } 
}

 

之后在外面使用该自定义控件，注意要为该控件指定rowColorFunction

<BaseUI:CustomerDataGrid
        id="dgRain"
        width="100%"
        height="100%"
        dataProvider="{ac}"
        borderVisible="false"
        click="cli(event)"
        rowColorFunction="colorFunction"  //指定了改变颜色的方法
        >
        <BaseUI:columns>
            <mx:DataGridColumn dataField="waid"
                               headerText="预警编号" visible="false"/>
            <mx:DataGridColumn dataField="wanm"
                               headerText="预警名称"/>
            <mx:DataGridColumn dataField="stcd"
                               headerText="测站编号" visible="false"/>
            <mx:DataGridColumn dataField="STNM"
                               headerText="测站名称"/>
            <mx:DataGridColumn dataField="stid"
                               headerText="状态" labelFunction="stateFunction"/>
            <mx:DataGridColumn dataField=""
                               headerText="操作" itemRenderer="view.ssjk.ui.SsjkRainItemRender"/>
        </BaseUI:columns>
    </BaseUI:CustomerDataGrid>

 

//改变颜色方法

private function colorFunction(item:Object, color:uint):uint
        {
            switch(item.stid)
            {
                case 0:
                    break;
                case 1:
                    color=0xF10026;
                    break;
                case 2:
                    color=0x26972d;
                    break;
                case 3:
                    color=0xFFDF00;
                    break;
                case 4:
                    color=0xFFDF00;
                    break;
                case 5:
                    color=0xFFDF00;
                    break;
                case 6:
                    color=0xFFDF00;
                    break;
                case 7:
                    color=0xFFDF00;
                    break;
            }
            return color; 
        }

下面为效果图~~