Xceed.Wpf.Toolkit.AutoSelectTextBox.OnPreviewKeyDown C# (CSharp) Method

    protected override void OnPreviewKeyDown( KeyEventArgs e )
    {
      if( !this.AutoMoveFocus )
      {
        base.OnPreviewKeyDown( e );
        return;
      }

      if( ( e.Key == Key.Left )
        && ( ( Keyboard.Modifiers == ModifierKeys.None )
          || ( Keyboard.Modifiers == ModifierKeys.Control ) ) )
      {
        e.Handled = this.MoveFocusLeft();
      }

      if( ( e.Key == Key.Right )
        && ( ( Keyboard.Modifiers == ModifierKeys.None )
          || ( Keyboard.Modifiers == ModifierKeys.Control ) ) )
      {
        e.Handled = this.MoveFocusRight();
      }

      if( ( ( e.Key == Key.Up ) || ( e.Key == Key.PageUp ) )
        && ( ( Keyboard.Modifiers == ModifierKeys.None )
          || ( Keyboard.Modifiers == ModifierKeys.Control ) ) )
      {
        e.Handled = this.MoveFocusUp();
      }

      if( ( ( e.Key == Key.Down ) || ( e.Key == Key.PageDown ) )
       && ( ( Keyboard.Modifiers == ModifierKeys.None )
         || ( Keyboard.Modifiers == ModifierKeys.Control ) ) )
      {
        e.Handled = this.MoveFocusDown();
      }

      base.OnPreviewKeyDown( e );
    }