Filter GridView with TextBox, focus issue

[Nicolas]

My scenario:
I have a simple Telerik GridView and a single Textbox in my WPF App. When I type in the TextBox (FilterBox), I update some FilterDescriptor values and the GridView gets filtered accordingly. 

What I want to achieve:
Basically the same behaviour as the Google Chrome Browser in "Search-Mode"; The FilterBox receives all Keyboard presses EXCEPT the arrow keys and "Page Up", "Page Down". Those button presses should be redirected to the GridView, allowing the users to scroll through the filtered results while keeping the focus on the FilterBox (and so allow them to adjust the filter text until they are satisfied with the results). 

I've tried handling the PreviewKeyDown event of the FilterBox in the following way:

private void textFilter_PreviewKeyDown(object sender, KeyEventArgs e)

   {

     switch (e.Key)

     {

       case Key.Down:

         {

           e.Handled = true;

           RoutedUICommand moveDownCommand = RadGridViewCommands.MoveDown as RoutedUICommand;

           RoutedUICommand selectCommand = RadGridViewCommands.SelectCurrentUnit as RoutedUICommand;

           moveDownCommand.Execute(null, this.radGridView);

           selectCommand.Execute(null, this.radGridView);

           break;

         }

       case Key.Up:

         {

           e.Handled = true;

           RoutedUICommand moveUpCommand = RadGridViewCommands.MoveUp as RoutedUICommand;

           RoutedUICommand selectCommand = RadGridViewCommands.SelectCurrentUnit as RoutedUICommand;

           moveUpCommand.Execute(null, this.radGridView);

           selectCommand.Execute(null, this.radGridView);

           break;

         }

       default:

         return;

     }

     textFilter.Focus();
    }

The code works (the up and down arrow keys control the grid), but the FilterBox loses the focus. 

What do I have to do?

[Vlad]

Hello,

 Can you try to execute textFilter.Focus() using Dispatcher? 

All the best,
Vlad
the Telerik team

[Nicolas]

Thanks, that works!

Just to be complete, I used the following code at the end the PreviewKeyDown method:

Dispatcher.BeginInvoke(DispatcherPriority.Input, new Action(() =>
      {
        Keyboard.Focus(textFilter);
      }));

[Nick]

Hello Nicolas,

Yes this will work. You can also do it by textFilter.Focus(). You can reed more about the difference between the two approaches here.

Kind regards,
Nik
the Telerik team

[Shreya]

Hi Nicolas,
I know its very old post but can you tell me how did you updated the gridview results based on text provided in textbox.

Thanks Much

[Dimitrina]

Hello,

You can also check our Search As You Type WPF Demo as a reference. It works fine on updating the filtering criteria on each key stroke. 

Furthermore, you may be interested in the "Filter As You Type With FilterRow" SDK example running it with our SDK Samples Browser. 

Regards,
Dimitrina
Telerik