double click column header gridsplitter to automatically adjust the size

[mirang]

I there any way we can automatically adjust the column width when the user double clicks on the splitter in column. Currently the user has to select the splitter and drag in order to size it.

[Vlad]

Hello,

 We believe that this is supported by default. You can try for example resize/auto adjust on this demo:
http://demos.telerik.com/silverlight/#GridView/DomainDataSource

Best wishes,
Vlad
the Telerik team

[mirang]

I am not able to do this when i set the column width in * say 10*, 20*... Can you please verify this  behavior.

[mirang]

a sample code for the same : 
XAML : 
<UserControl xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"  x:Class="SilverlightApplication1.Grid.RadGridDemo1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">
    
    <Grid x:Name="LayoutRoot" Background="White">
        <telerik:RadGridView x:Name="gridView" Grid.Row="1" IsReadOnly="True" AutoGenerateColumns="False" VerticalAlignment="Stretch"
                             SelectionUnit="FullRow" EnableRowVirtualization="True" EnableColumnVirtualization="True"
                             VerticalContentAlignment="Top" ItemsSource="{Binding Results}" AutoExpandGroups="True"
                             SelectedItem="{Binding SelectedItem, Mode=TwoWay}" CanUserFreezeColumns="False"
            telerik:AnimationManager.IsAnimationEnabled="False"
            AutomationProperties.AutomationId="OWS_Results_Mail_GridControl">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding EmpID}" Width="30*" />
                <telerik:GridViewDataColumn DataMemberBinding="{Binding EmpLastName}" Width="30*"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding EmpDesig}"  Width="40*"/>
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
    </Grid>
</UserControl>

Code Behind : 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;


namespace SilverlightApplication1.Grid
{
    public class SampleDataSource
    {
        public int EmpID { get; set; }
        public string EmpLastName { get; set; }
        public string EmpDesig { get; set; }


    }
    public partial class RadGridDemo1 : UserControl
    {
        public List<SampleDataSource> sampleData;
        public RadGridDemo1()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(RadGridDemo1_Loaded);
        }


        void RadGridDemo1_Loaded(object sender, RoutedEventArgs e)
        {
            GenerateData();
            this.DataContext = sampleData;
            gridView.ItemsSource = sampleData;
        }
        private void GenerateData()
        {
            List<SampleDataSource> sd = new List<SampleDataSource>();
            for(int i = 0 ; i < 100 ; i++)
            {
                SampleDataSource sd1 = null;
                if(i % 3 ==0)
                {
                    sd1 = new SampleDataSource { EmpID = i, EmpDesig = "Senior Software Engineer", EmpLastName = "last name " + i };
                }
                else if (i % 2 == 0)
                {
                    sd1 = new SampleDataSource { EmpID = i, EmpDesig = "Engineer", EmpLastName = "last name " + i };
                }
                else if (i % 1 == 0)
                {
                    sd1 = new SampleDataSource { EmpID = i, EmpDesig = "Software Engineer", EmpLastName = "last name " + i };
                }
                sd.Add(sd1);
            }
            sampleData = sd;
        }
    }
}

[Cody]

mirang is right, it seems that this doesn't work if the ColumnWidth is set to * rather than auto. I'm using WPF but the behavior seems to be the same. Is there no way to hook the divider double click event so that I can programmatically change the column width to Auto? Strange that this doesn't work by default.

[Stefan]

Hello Cody,

You can use the ColumnWidthChanging event to achieve your goal. It will be raised when the user resizes a given column through the UI. Can you please check it out?

Regards,
Stefan
Progress Telerik