Renderer that doesn't change dataprovider

Is there a way to apply a renderer to a grid in a way so that it doesn't modify the values in the data provider? I have a datagrid and on one of its columns I have a customer rend开发者_如何转开发erer which overrides the set data function and converts the number value in the dataprovider to a word. My problem is that when I sort the grid by that column it sorts by the new value, whereas I want it to sort by the old value that was originally in the dataprovider.

Here is my renderer:

public class MyRenderer extends Text {

     override public function set data(value:Object):void {
        super.data = value;
        data[DataGridListData(listData).dataField] = MyClass.convertValue(data[DataGridListData(listData).dataField]);
        super.invalidateDisplayList();
    }
}

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The problem is this line:

data[DataGridListData(listData).dataField] = MyClass.convertValue(data[DataGridListData(listData).dataField]); 

Right there, you are setting the field value to a different value.

Instead of using a custom renderer, just use a labelFunction that does a convertValue on that field. Then the non-custom renderer will simply take the label value from the DataGridListData and use it for the displayed value.

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ItemRenderers, by default, do not modify dataProviders. Since you didn't show code it's hard to tell whether or not the code you've written modified the dataProvider.

I you want to sort a DataGrid based on values in the dataProvider that have no relation on the values displayed in the grid; you should use a sortCompareFunction on the DataGrid.