[Solved] Bring current item into view problem

[Patrick]

Hello,

I have a problem with the positioning of the current element in the visible part of the grid when reloading a page.

Grid definition :

<Grid:RadDataGrid ItemsSource="{Binding Diffuseurs}"  SelectedItem="{Binding SelectedDiffuseur,Mode=TwoWay}"                   IsSynchronizedWithCurrentItem="True">

I displayed the first time a page associated with a persistent DataContext and I select an item in the grid :
-> Everything is correct ( selectedItem , currentItem ) and the binding property in the ViewModel.

I display another page then come back to my previous page by Frame.Navigate method(typeof(MyPage)) :
-> The page is reloaded and the SelectedItem property of the grid is updated from my DataContext but against the property CurrentItem remains null and my current item is not returned in the visible part of the grid.

When I try to use the ScrollItemIntoView method in an event of the grid (Loaded, DataBindingComplete, SelectionChanged ) it doesn't work, CurrentItem remains null.

Thank you in advance for your help.

Regards

Patrick

[Ivaylo Gergov]

Hi,

You can move the current item of the RadDatGrid to its previous position through the IDataView.MoveCurrentTo(..) method. The IDataView interface provides a view over the already computed data within the RadDataGrid. You can get it through the RadDataGrid.GetDataView() method. So in this case the code should look like this:

this.grid.GetDataView().MoveCurrentTo(previousCurrentItem);

Note that the RadDataGrid will automatically bring this item into view so the RadDataGrid.ScrollItemIntoView() method is not needed.

Let me know if this works for you.


Regards,
Ivaylo Gergov
Telerik

 

 

[Patrick]

Hi Ivaylo,

I used this method but how and where do I use it. In the event of the grid (DataBindingComplete, SelectionChange) or page (Loaded), the method always returns false.

In which context MoveCurrentTo returns false ?

Regards
Patrick

[Ivaylo Gergov]

Hi,

The MoveCurrentTo(..) method returns false when for some reason the RadDataGrid still makes some internal computations over its data and the data is not ready yet. Basically, the RadDataGrid.DataBindingComplete event/command assures that all the internal processes that operate with its data are done, but this means that this event will fire in many cases like after filtering,grouping and etc. In this case I think it would be a good idea if you execute this method in the RadDataGrid.Loaded event. I have tried this approach in a plain project and it seems that everything works as expected. Could you please give it a try and tell us if this works for you? If not, it will be helpful if you send us a project where this does not work and we will further investigate for a reasonable solution.

I am looking forward to your reply.

Regards,
Ivaylo Gergov
Telerik