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How to reset RowStyle to default?

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Markus
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Markus asked on 28 May 2014, 12:22 PM
In my GridView I color rows differently based on the current value of a Combobox column. Each change of the combobox value triggers the PropertyChanged event of the business object.
This works just fine as long as I return one of my own styles in SelectStyle. The row gets correctly drawn using that style.
The problem is, that I want to reset the row style to default (= no style) for one particular combobox value. In this case SelectStyle returns base.SelectStyle(item, container) which is always null (= OK). But the row remains drawn using the previous style although the PropertyChanged event is correctly triggered. If I force the UI to recreate the UI controls of that row (by manually resizing the window), the row is drawn correctly.

What am I missing?

Can I force a redraw of that row to remove the previous style other than by triggering the PropertyChanged event?
I could create my own "Empty Style", but this is what I want to avoid. Any ideas?

Thanks for any help.

Markus

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Yoan
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answered on 30 May 2014, 06:38 PM
Hi Markus,

Actually, this is know issue. It has been logged in our bug tracking system for further investigation.

Regards,
Yoan
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Markus
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answered on 02 Jun 2014, 11:44 AM
Hi Yoan,

thanks for your note.
Once you investigated this issue, can you please let me know if there is a workaround possible or in which release of Telerik for WPF his is going to be fixed.

Thanks and best regards,
Markus
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Yoan
Telerik team
answered on 02 Jun 2014, 04:49 PM
Hi Markus,

The problem has been logged into our Feedback portal as bug report. You can track the status of the issue by following the feedback item: Row's style is not updated when the SelectStyle method of RowStyleSelector returns null. Once we have a progress we will change its status.

The only workaround that I can suggest is to return some "fake" style targeting GridViewRow. For example:
public class StadiumCapacityStyle : StyleSelector
   {
       public override Style SelectStyle(object item, DependencyObject container)
       {
           if (item is Club)
           {
               Club club = item as Club;
               if (club.StadiumCapacity > 50000)
               {
                   return BigStadiumStyle;
               }
           }
           //return null;
           return TempStyle;
       }
 
 
       public Style BigStadiumStyle { get; set; }
 
       public Style TempStyle { get; set; }
   }
 
<my:StadiumCapacityStyle x:Key="stadiumCapacityStyle">
           <my:StadiumCapacityStyle.BigStadiumStyle>
               <Style TargetType="telerik:GridViewRow">
                   <Setter Property="Background" Value="Red"/>
               </Style>
           </my:StadiumCapacityStyle.BigStadiumStyle>
           <my:StadiumCapacityStyle.TempStyle>
               <Style TargetType="telerik:GridViewRow">
                   <Setter Property="MaxHeight"  Value="100"/>
               </Style>
           </my:StadiumCapacityStyle.TempStyle>
       </my:StadiumCapacityStyle>

I hope this helps.


Regards,
Yoan
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Markus
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answered on 03 Jun 2014, 07:51 AM
Thanks Yoan!

I go with the "fake" style for now.

Best regards,
Markus
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