flex 改变DataGrid每行背景色

1，新建类（重写DataGrid）
package myas.control
{
import mx.controls.DataGrid;
    import mx.controls.*;

    import flash.display.Shape;

    import mx.core.FlexShape;

    import flash.display.Graphics;

    import flash.display.Sprite;

    import mx.rpc.events.AbstractEvent;

    import mx.collections.ArrayCollection;

    import flash.events.Event;
     
public class RowDataGrid extends DataGrid
{
private var _rowColorFunction:Function;
public function RowDataGrid()
{
super();
}
    public function set rowColorFunction(f:Function):void
        {

              this._rowColorFunction = f;
        }
        public function get rowColorFunction():Function
        {

              return this._rowColorFunction;
        }
       
          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);

          }


}
}

2,调用，
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:control="myas.control.*">
<mx:Script>
<![CDATA[
private function setCustomColor(item:Object, color:uint):uint

{

    if( item['c3'] == "r6.c3" )// c3="r6.c3",c4="r7.c4"

    {

        return 0xFF0033;

    }

    return color;

}
private var i:uint=179845;
]]>
</mx:Script>
<control:RowDataGrid  dataProvider="{arrColl}" rowColorFunction="setCustomColor">
            <control:columns>
                <mx:DataGridColumn dataField="c1"
                        headerText="Column 1" />
                <mx:DataGridColumn dataField="c2"
                        headerText="Column 2" />
                <mx:DataGridColumn dataField="c3"
                        headerText="Column 3" />
                       
                <mx:DataGridColumn dataField="c4"
                        headerText="Column 4" />
            </control:columns>

</control:RowDataGrid>

    <mx:ArrayCollection id="arrColl">
        <mx:source>
            <mx:Array>
                <mx:Object c1="r1.c1" c2="r1.c2" c3="r1.c3" c4="r1.c4"/>
                <mx:Object c1="r2.c1" c2="r2.c2" c3="r2.c3" c4="r2.c4"/>
                <mx:Object c1="r3.c1" c2="r3.c2" c3="r3.c3" c4="r3.c4"/>
                <mx:Object c1="r4.c1" c2="r4.c2" c3="r4.c3" c4="r4.c4"/>
                <mx:Object c1="r5.c1" c2="r5.c2" c3="r5.c3" c4="r5.c4"/>
                <mx:Object c1="r6.c1" c2="r6.c2" c3="r6.c3" c4="r6.c4"/>
                <mx:Object c1="r7.c1" c2="r7.c2" c3="r7.c3" c4="r7.c4"/>
                <mx:Object c1="r8.c1" c2="r8.c2" c3="r8.c3" c4="r8.c4"/>
                <mx:Object c1="r9.c1" c2="r9.c2" c3="r9.c3" c4="r9.c4"/>
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>
</mx:Application>

评论

1 楼 pataliu 2009-05-26  

   if( dataIndex < this.dataProvider.length ){

                        var item:Object = this.dataProvider.getItemAt(dataIndex);

                        color = this.rowColorFunction.call(this, item, color);

                  }

报错:dataProvider = null!