Get scroll position

[Philip]

Hi!

Is there a possibility to find out the actual scroll position of the GridView? The matter is that I rebind the datasource und therefore the Grid looses the actual scroll position and jumps to the first item.

I experienced a bit with ScrollViewer and ScrollContentPresenter but couldnt find a solution!

Greetings
Philip

[Ваня]

Hi,Philip

See the following thread I think that it could be useful for you:
http://www.telerik.com/community/forums/silverlight/gridview/get-scrollbar-position-and-then-set-it.aspx


Regards,Vanya

[Aryn]

The thread has a link to a disabled page. Can you please provide another example? Thank you!

[Vanya Pavlova]

Hello Aryn,


Thank you for contacting us.

This forum post referrs to the following blog post "How To: Custom scrolling with RadGridView for Silverlight and WCF RIA Services".

For WPF you could take a look at the following post. 

Are you looking for something similar?


Regards,
Vanya Pavlova
Telerik

 

 

[Aryn]

The WPF post (you posted) led me to the silverlight one. Unfortunately, I cannot do what the WPF user did. I must rebind my data set. I have tried very hard to read the scroll bar position and reset it but it seems to only do this accurately when I am debugging. Otherwise it jumps randomly all over my 2000 + record set uncontrollably.

The code I used was:
var scrollViewer = this.GridView.ChildrenOfType<GridViewScrollViewer>().FirstOrDefault();
            //Get horizontal and vertical offsets
            var horizontalOffset = scrollViewer.HorizontalOffset;
            var verticalOffset = scrollViewer.VerticalOffset;

            //do edit and rebind
            LoadTablesAndGrid();

            //Set horizontal and vertical offsets    
            scrollViewer.ScrollToHorizontalOffset(horizontalOffset);
            scrollViewer.ScrollToVerticalOffset(verticalOffset);

[Vanya Pavlova]

Hello Phillip,


I believe that the following forum thread "RadGridView scroll position reset after Rebind()" might be of help on that matter. 


Regards,
Vanya Pavlova
Telerik

 

 

[Aryn]

Phillip,

Thanks for the suggested post but if you notice that is exactly what I tried. When I do that it works when I am debugging otherwise it throws me all over my 2000+ records. I have found a hack solution that will get me by that hacks the ScrollIntoView but unfortunately it looks to me that you cannot reliably rely on the ScrollViewer to return you to your same location in the grid.

Thanks,
Aryn

[Dimitrina]

Hi,

You can try saving the state of the ScrollViewer (VerticalOffset) and apply it after you have called Rebind().

For example:

scrollViewer =this.clubsGrid.ChildrenOfType<GridViewScrollViewer>().FirstOrDefault();

var verticalOffset = scrollViewer.VerticalOffset;
//reset of the itemssource
//Set vertical offset back
...

You can also check this forum thread where this question has already been discussed.

Does this result in an uncontrollable scroll behavior?

Regards,
Dimitrina
Telerik