RadGridView Column Header doesn't auto change width

[runer]

When I change column header from longer to shorter one, the width not change

 

here is demo:

first a BindingData to transfer Header property to GridViewColumn Header property:

sealed class BindingData : Freezable
{
    protected override Freezable CreateInstanceCore()
    {
        return new BindingData { Data = this.Data };
    }

    public object Data
    {
        get { return (object)this.GetValue(DataProperty); }
        set { this.SetValue(DataProperty, value); }
    }

    public static readonly DependencyProperty DataProperty =
        DependencyProperty.Register(
            "Data",
            typeof(object),
            typeof(BindingData));
}

 

ViewModel:

sealed class ViewModel : ViewModelBase
{
    private string header = "";
    public string Header
    {
        get { return this.header; }
        set
        {
            if (this.header != value)
            {
                this.header = value;
                NotifyPropertyChanged("Header");
            }
        }
    }

    public IEnumerable<string> HeaderSource
    {
        get
        {
            return Enumerable.Range(1, 3)
                .Select(item => "Header " + item)
                .Concat(Enumerable.Range(3, 5)
                    .Select(item => "Very Very Very Long Header " + item));
        }
    }

    public IEnumerable<string> RowSource
    {
        get
        {
            return Enumerable.Range(1, 16)
                .Select(item => "Data " + item);
        }
    }
}

 

View:

<StackPanel>
    <StackPanel.Resources>
        <local:BindingData
            x:Key="HeaderBindingData"
            Data="{Binding Header}"
            />
    </StackPanel.Resources>

    <ComboBox
        ItemsSource="{Binding HeaderSource}"
        SelectedValue="{Binding Header, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
        />

    <telerik:RadGridView ItemsSource="{Binding RowSource}">
        <telerik:RadGridView.Columns>
            <telerik:GridViewDataColumn
                DataMemberBinding="{Binding}"
                Header="{Binding Data, Source={StaticResource HeaderBindingData}}"
                />
        </telerik:RadGridView.Columns>
    </telerik:RadGridView>
</StackPanel>

 

Telerik.Windows.Controls.GridView.dll version is under 2014.2

[Martin Ivanov]

Hello Runer,

This behavior is expected. The column usually tries to expand in order to show its header. However, it doesn't shrink if the header is small. To alter this behavior you can reset the Width of the corresponding column when the header changes. For example, in your case you can use the SelectionChanged event of the ComboBox control. 

private void ComboBox_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
    this.gridView.Columns[0].Width = new GridViewLength(1, GridViewLengthUnitType.Pixel);
    this.gridView.Columns[0].Width = new GridViewLength(1, GridViewLengthUnitType.Auto);
}

You can also check the attached project. I hope this helps.

Regards,
Martin Ivanov
Progress Telerik