[Solved] update header at runime

[Po Ly]

Hi,

I would like to refresh the header background and text at runtime, on a click of a button, without having to regenerate the entire grid.
I managed to change the HeaderCellStyle property, but the change is not visible unless I scroll left or right to hide the modified columns.
How can I make the change appear immidiatly when changed?

Thanks,
Pol

[Dimitrina]

Hello,

 Please check this forum thread.

Greetings,
Didie
the Telerik team

[Po Ly]

Hello Didie,
Thank you for you answer.
However, it seems hard to apply to my senario, as I do not want to change all the headers, but only one. I need to alternate on the fly between 2 styles, and both styles have custom textblocks related to the column data.
I managed to change the style, but the change is not refreshed until the column scrolls out of view.

Here is the normal template:

<ControlTemplate x:Key="RegularHeaderStyle" TargetType="telerik:GridViewHeaderCell">
        <StackPanel Orientation="Vertical">
            <Border BorderThickness="0 0 0 1" BorderBrush="LightGray" Height="25" Background="White">
                <TextBlock Margin="5 5 0 0" Text=" ">
                </TextBlock>
            </Border>
            <Border BorderThickness="0 0 1 0" BorderBrush="LightGray" Margin="0 0 0 2" Height="75">
                <TextBlock Width="75" Height="20" Margin="15 70 -35 -15" Foreground="Black"
                                              Text="Header Text">
                    <TextBlock.RenderTransform>
                        <CompositeTransform Rotation="-90" />
                    </TextBlock.RenderTransform>
                </TextBlock>
            </Border>
        </StackPanel>
</ControlTemplate>

Here is the special template:

<ControlTemplate x:Key="MilestoneHeaderStyle"  TargetType="telerik:GridViewHeaderCell">
<StackPanel Orientation="Vertical">
    <Border BorderThickness="0 0 0 1" Grid.ColumnSpan="2" BorderBrush="LightGray" Height="25" Background="White">
        <TextBlock Margin="0 5 0 5" HorizontalAlignment="Left" Foreground="Black" Text="{Binding Path=ManagementVM.MilestoneList[0], Source={StaticResource Locator}}">
        </TextBlock>
    </Border>
    <Border BorderThickness="0 0 1 0" BorderBrush="LightGray" Margin="0 0 0 2" Height="75">
        <Border.Background>
            <LinearGradientBrush EndPoint="0.2,0.56" StartPoint="0.2,0">
                <LinearGradientBrush.GradientStops>
                    <GradientStop Color="#FFFED8A3"/>
                        <GradientStop Color="#FFFED08F" Offset="0.42"/>
                            <GradientStop Color="#FFFEA449" Offset="0.43"/>
                                <GradientStop Color="#FFFEC159" Offset="1"/>
                </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>
        </Border.Background>
        <TextBlock Width="75" Height="20" Margin="15 70 -35 -15" Foreground="Black" Text="Header Text">
            <TextBlock.RenderTransform>
                <CompositeTransform Rotation="-90" />
            </TextBlock.RenderTransform>
        </TextBlock>
    </Border>
</StackPanel>
</ControlTemplate>

Thanks,
Pol

[Dimitrina]

Hi,

 Indeed the header will need to be redrawn. There is not a HeaderCellStyleSelector for the GridViewDataColumn.

Regards,
Didie
the Telerik team

[Po Ly]

But why is the change is not refreshed until the column scrolls out of view?