GridView中的WPF FrameworkElement-更新列宽

Question

I have a GridView. In one column a CustomControl (derived from FrameworkElement) is in the DataTemplate.

According to some interaction the CustomControl will changed its Width. How can I achieve, that the GridViewColumn changes it's Width dynamically to the Width of the widest CustomControl?

Answer 1

Handle the SizeChanged event of the control and set the Width of the GridViewColumn :

private void TextBox_SizeChanged(object sender, SizeChangedEventArgs e)
{
    FrameworkElement ctrl = sender as FrameworkElement;
    theColumn.Width = ctrl.ActualWidth + 20;
}

XAML:

<GridViewColumn x:Name="theColumn">
    <GridViewColumn.CellTemplate>
        <DataTemplate>
            <local:TheResizingControl />
        </DataTemplate>
    </GridViewColumn.CellTemplate>
</GridViewColumn>

The control nor the framework won't do this for you. You need to write some code that does this.