Made ScrollViewer automatically scroll to last move

Author: szv

src/Codebreaker.WPF/Helpers/PageExtensions.cs

@@ -0,0 +1,31 @@
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Codebreaker.WPF.Helpers;
+
+internal static class PageExtensions
+{
+    public static void UnregisterAllOnUnloaded(this IMessenger messenger, FrameworkElement page) =>
+        messenger.UnregisterAllOnUnloaded(page, page);
+
+    public static void UnregisterAllOnUnloaded(this IMessenger messenger, FrameworkElement page, object messageRecepient)
+    {
+        void UnloadedCallback(object sender, RoutedEventArgs args)
+        {
+            messenger.UnregisterAll(messageRecepient);
+            page.Unloaded -= UnloadedCallback;
+        }
+
+        page.Unloaded += UnloadedCallback;
+    }
+
+    public static void CallOnceOnUnloaded(this FrameworkElement page, Action<object, RoutedEventArgs> action)
+    {
+        void Callback(object sender, RoutedEventArgs args)
+        {
+            action?.Invoke(sender, args);
+            page.Unloaded -= Callback;
+        }
+
+        page.Unloaded += Callback;
+    }
+}

src/Codebreaker.WPF/Views/Pages/GamePage.xaml.cs

@@ -1,24 +1,21 @@
 using Codebreaker.ViewModels.Contracts.Services;
+using Codebreaker.WPF.Helpers;
+using CommunityToolkit.Mvvm.Messaging;
 
 namespace Codebreaker.WPF.Views.Pages;
 
-public partial class GamePage : Page
+public partial class GamePage : Page, IRecipient<GameMoveMessage>
 {
     private readonly INavigationService _navigationService;
 
     public GamePage()
     {
         ViewModel = App.Current.GetService<GamePageViewModel>();
         _navigationService = App.Current.GetService<INavigationService>();
-
         DataContext = this;
-
         InitializeComponent();
-
-        //WeakReferenceMessenger.Default.Register<GameStateChangedMessage>(this, (r, m) =>
-        //{
-        //    VisualStateManager.GoToElementState(MainGrid, m.GameMode.ToString(), true);
-        //});
+        WeakReferenceMessenger.Default.Register(this);
+        WeakReferenceMessenger.Default.UnregisterAllOnUnloaded(this);
     }
 
     public GamePageViewModel ViewModel
@@ -34,4 +31,13 @@ private async void Button_Click(object sender, RoutedEventArgs e)
     {
         await _navigationService.NavigateToAsync("TestPage");
     }
+
+    public void Receive(GameMoveMessage message)
+    {
+        if (message.GameMoveValue is not GameMoveValue.Completed)
+            return;
+
+        pegScrollViewer.UpdateLayout();
+        pegScrollViewer.ScrollToBottom();
+    }
 }