flex实现DataGrid高亮显示数据功能的解决方案

flex要高亮数据一般可以使用选中效果或者设置背景，选中效果只能是高亮一条，多条高亮只能设置背景来达到效果。但是原生的DataGrid根本无法达到所要的效果，目前一般就是来改写原生的DataGrid,只需重新写一个类来重写drawRowBackground方法就可以了，代码如下


代码如下:

package org.lxh 
{    
    import flash.display.Sprite; 
    import mx.controls.DataGrid; 
    public class SpecialDataGrid 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 SpecialDataGrid() 
        { 
            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); 
        } 
    } 
}

用的时候先引入名称空间 xmlns:control="org.lxh.*",把原来的DataGrid改成下面这样


代码如下:

<control:SpecialDataGrid id="planDataGrid" width="100%"  height="100%"  alternatingItemColors="[0xe3eaf2,0xe8f1f8]" dataProvider="{strArray}" rowColorFunction="colorFunction" doubleClick="planDataGrid_doubleClickHandler(event)" doubleClickEnabled="true"> 
                        <control:columns> 
                            <mx:DataGridColumn dataField="选择" width="50" sortable="false" resizable="false"  showDataTips="true"> 
                                <mx:itemRenderer> 
                                    <fx:Component> 
                                        <mx:CheckBox change="outerDocument.checkChangeHandlerForPlan(event)"/> 
                                    </fx:Component> 
                                </mx:itemRenderer> 
                            </mx:DataGridColumn> 
                        <mx:DataGridColumn dataField="id" headerText="主键" visible="false"/>

</control:columns> 
                    </control:SpecialDataGrid>

rowColorFunction属性用来设置高亮的效果，例如那一列需要高亮，对应的function如下


代码如下:

private function colorFunction(item:Object, color:uint):uint 
    { 
                    var col:uint=0xe3eaf2; 
                    if(commonMsg.length > 0){ 
                        for(var i:int=0;i<commonMsg.length;i++){ 
                            if(commonMsg.getItemAt(i).id==item.id){ 
                                col=0xF10026; 
                            } 
                        } 
                    } 
                    return col;

}

到这里效果就做出来了