CODEWITHSUNDEEP
c#wpf
johns193
johns193

Reputation: 61

WPF DataGridTextColumHeaderTemplate bind width to TextColumnWidth of "*"

I have a DataGrid with DataGridTextColum of width="*" (multiple of them, so that they're all divided equally) and I'd like to set the width of this DataGridTextColumn's DataGridTextColumn.Header to its parent width (DataGridTextColumn).

However the code doesn't work, reason is I'm not defining RelativeSource correct, so my question is, how do I define Binding to Width inside HeaderTemplate of DataGridTextColumn to bind to DataGridTextColumn.ActualWidth? Code below!

<DataGridTextColumn Width="*" Binding="{Binding Username}" CanUserReorder="False" CanUserSort="False" x:Name="DataGridTextColumn">
   <DataGridTextColumn.HeaderTemplate>
        <DataTemplate>
             <StackPanel Orientation="Horizontal" Background="Red" MouseLeftButtonDown="EventSetter_OnHandler" Width="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType=DataGridTextColumn},Path=ActualWidth, UpdateSourceTrigger=PropertyChanged}">
                    <Label>Username</Label>
             </StackPanel>
        </DataTemplate>
   </DataGridTextColumn.HeaderTemplate>
</DataGridTextColumn>

If I change the binding source to ElementName, everything works fine as expected, but i'd like to use RelativeSource to reduce amount of naming that I have to do.

Thanks!

Upvotes: 0

Views: 76

Answers (1)

AnjumSKhan
AnjumSKhan

Reputation: 9827

DataGridColumn is not a FrameworkElement, so it won't appear in the VisualTree. It is merely a information-holder entity. What actually gets rendered is a DataGridColumnHeader for every Column. So, your HeaderTemplate contents would be present in this DataGridColumnHeader. And this DataGridColumnHeader uses its Column property to maintain its association with DataGridColumn. So,

Change your Width of StackPanel to Width="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=DataGridColumnHeader},Path=Column.ActualWidth, UpdateSourceTrigger=PropertyChanged}" .

Upvotes: 1

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