Forums | NoesisGUI

<TabControl x:Name="MyTabControl" SelectedIndex="{Binding ActiveTabIndex}">
	<TabItem x:Name="Tab1">
		<local:CustomControlTab1 FocusManager.IsFocusScope="True"/>
	</TabItem>
	<TabItem x:Name="Tab2">
		<local:CustomControlTab2 FocusManager.IsFocusScope="True"/>
	</TabItem>
	<TabItem x:Name="Tab3">
		<local:CustomControlTab3 FocusManager.IsFocusScope="True"/>
	</TabItem>
	<TabItem x:Name="Tab4">
		<local:CustomControlTab4 FocusManager.IsFocusScope="True"/>
	</TabItem>
</TabControl>

<UserControl
	x:Class="CustomControlTab1"
>
	<Grid x:Name="Root" Width="1700">
        
		<ScrollViewer x:Name="Container" KeyboardNavigation.DirectionalNavigation="Contained" KeyboardNavigation.TabNavigation="Contained" KeyboardNavigation.ControlTabNavigation="Contained">
			<StackPanel>
				<!-- various focusable elements arranged vertically -->
			</StackPanel>
		</ScrollViewer>
	</Grid>
</UserControl>

<UserControl 
     <!-- some other things -->
     x:Class="CustomControlTab1"
     FocusManager.IsFocusScope="True"
>

public class OverlayBaseControl : UserControl
    {
        private UIElement _lastFocusedElement;

        public OverlayBaseControl()
        {
            WeakReference weak = new WeakReference(this);
            this.GotKeyboardFocus += GotKeyboardFocusHandler;
            this.Loaded += ScreenLoaded;
        }

        public void ScreenLoaded(object sender, Noesis.EventArgs eventArgs)
        {
            UIElement storedFocus = FocusManager.GetFocusedElement(this);
            if (storedFocus != null)
            {
                // This code is never executed, storedFocus is always null
                Keyboard.Focus(storedFocus);
                storedFocus.Focus();
            }
        }

        public void GotKeyboardFocusHandler(object sender, KeyboardFocusChangedEventArgs eventArgs)
        {
            _lastFocusedElement = eventArgs.NewFocus;
            // ^^ new focus in not null at this point
            for (DependencyObject d = _lastFocusedElement as DependencyObject; 
                 d != null; d = VisualTreeHelper.GetParent(d)) {
                if (FocusManager.GetIsFocusScope(d)) {
                    d.SetValue(FocusManager.FocusedElementProperty, _lastFocusedElement);
                    if (d is not OverlayBaseControl)
                    {
                        break;
                    }
                }
            }
        }