Click here to Skip to main content
Click here to Skip to main content

Tagged as

ScrollIntoView for a DataGrid when using MVVM

, 8 Nov 2010 CPOL
Rate this:
Please Sign up or sign in to vote.
I just ran into a small problem with a databound DataGrid in Silverlight. If the SelectedItem is changed by the ViewModel, the DataGrid does not scroll to the SelectedItem.
I created a behavior to do this for me. So now if the Selection of the DataGrid is changed, the DataGrid scolls to the selecteditem. (It used the ScrollIntoView method of the DataGrid.)
 
namespace MVVM.Framework
{public class ScrollIntoViewBehavior : Behavior<DataGrid>
    {
        protected override void OnAttached()
        {
            base.OnAttached();
            this.AssociatedObject.SelectionChanged += new SelectionChangedEventHandler(AssociatedObject_SelectionChanged);
        }
        void AssociatedObject_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (sender is DataGrid)
            {
                DataGrid grid = (sender as DataGrid);
                if (grid.SelectedItem != null)
                {
                    grid.Dispatcher.BeginInvoke(delegate
                    {
                        grid.UpdateLayout();
                        grid.ScrollIntoView(grid.SelectedItem, null);
                    });
                }
            }
        }
        protected override void OnDetaching()
        {
            base.OnDetaching();
            this.AssociatedObject.SelectionChanged -=
                new SelectionChangedEventHandler(AssociatedObject_SelectionChanged);
        }
    }
}
 
To use this in XAML: (make sure you have included xmlns:fw="clr-namespace:MVVM.Framework" in your header).
 
<sdk:DataGrid AutoGenerateColumns="true" ItemsSource="{Binding ObjectList}" SelectedItem="{Binding SelectedObject, Mode=TwoWay}" Name="dataGridObjects">
    <i:Interaction.Behaviors>
        <fw:ScrollIntoViewBehavior/>
    </i:Interaction.Behaviors>
</sdk:DataGrid>

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

JeroenVonk
Software Developer (Senior) Inter Access BV
Netherlands Netherlands
No Biography provided
Follow on   Twitter

Comments and Discussions

 
QuestionThe attachable property 'Behaviors' was not found in type 'Interaction'. PinmemberPaul Cooper3-Dec-13 23:46 
QuestionScroll position PinmemberAnne Jan Pool17-Oct-13 0:39 
QuestionFine concept, 5***** PinmemberMember 87070899-Oct-13 2:53 
QuestionBrilliant! Thank you a lot! PinmemberDmitry Leonov3-Sep-12 7:09 
GeneralExcellent! Thank you- this saved me a lot of time and allow... PinmemberMonAccount15-Sep-11 6:24 
GeneralReason for my vote of 5 Exactly what I needed. Nice work. Pinmemberscottfm15-Jul-11 3:47 
GeneralSweet. I got this to work for a listBox too! Thanks! PinmemberMr. Sharps28-Apr-11 21:01 
GeneralReason for my vote of 5 Neat tip! Pinmembermamta_m_d9-Nov-10 18:00 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.141216.1 | Last Updated 8 Nov 2010
Article Copyright 2010 by JeroenVonk
Everything else Copyright © CodeProject, 1999-2014
Layout: fixed | fluid