Initialize modern ui with avalonia

Race Element.UI/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+  xmlns:themes="clr-namespace:Avalonia.Themes.Neumorphism;assembly=Avalonia.Themes.Neumorphism"
+  xmlns:materialIcons="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
+  x:Class="RaceElement.UI.App"
+  xmlns:local="using:RaceElement.UI"
+  RequestedThemeVariant="Light">
+
+  <Application.DataTemplates>
+    <local:ViewLocator/>
+  </Application.DataTemplates>
+
+  <Application.Styles>
+    <themes:NeumorphismTheme BaseTheme="Light" PrimaryColor="LightBlue" SecondaryColor="Lime" />
+    <StyleInclude Source="avares://Material.Icons.Avalonia/MaterialIconStyles.axaml" />
+  </Application.Styles>
+</Application>

Race Element.UI/App.axaml.cs

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+using Avalonia;
+using Avalonia.Markup.Xaml;
+using Avalonia.Controls.ApplicationLifetimes;
+using RaceElement.UI.ViewModels;
+using RaceElement.UI.Views;
+
+namespace RaceElement.UI;
+public partial class App : Application
+{
+  public override void Initialize()
+  {
+    AvaloniaXamlLoader.Load(this);
+  }
+
+  public override void OnFrameworkInitializationCompleted()
+  {
+    if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+    {
+      desktop.MainWindow = new MainWindow
+      {
+        DataContext = new MainWindowViewModel(),
+      };
+    }
+    else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
+    {
+      singleViewPlatform.MainView = new MainWindow
+      {
+        DataContext = new MainWindowViewModel()
+      };
+    }
+
+    base.OnFrameworkInitializationCompleted();
+  }
+
+}

Race Element.UI/Program.cs

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+using System;
+using Avalonia;
+using Avalonia.Styling;
+using Avalonia.ReactiveUI;
+
+namespace RaceElement.UI;
+
+internal sealed class Program
+{
+  // Initialization code. Don't use any Avalonia, third-party APIs or any
+  // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+  // yet and stuff might break.
+  [STAThread]
+  public static void Main(string[] args) => BuildAvaloniaApp()
+      .StartWithClassicDesktopLifetime(args);
+
+  // Avalonia configuration, don't remove; also used by visual designer.
+  public static AppBuilder BuildAvaloniaApp()
+      => AppBuilder.Configure<App>()
+          .UsePlatformDetect()
+          .WithInterFont()
+          .LogToTrace()
+          .UseReactiveUI();
+}

Race Element.UI/RaceElement.UI.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Remove="Assets\race element icon 2.ico" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.2.6" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.2.6" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.2.6" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.2.6" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.2.6">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.2.6" />
+    <PackageReference Include="Material.Icons.Avalonia" Version="2.3.1" />
+    <PackageReference Include="Neumorphism.Avalonia" Version="0.11.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Update="Views\MainTopMenuView.axaml.cs">
+      <DependentUpon>MainTopMenuView.axaml</DependentUpon>
+    </Compile>
+    <Compile Update="Views\Pages\OverlaySettingPages\ControlButtonsPanelView.axaml.cs">
+      <DependentUpon>ControlButtonsPanelView.axaml</DependentUpon>
+    </Compile>
+  </ItemGroup>
+</Project>

Race Element.UI/Services/GameSelectionService.cs

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+// Create a new file: Race Element.UI/Services/GameSelectionService.cs
+using ReactiveUI;
+using System;
+using System.Diagnostics;
+
+namespace RaceElement.UI.Services;
+
+public enum SupportedGame
+{
+    IRacing,
+    ACC,
+    ACEvo,
+    LMU
+}
+
+/// <summary>
+/// Provides application-wide access to the currently selected game
+/// </summary>
+public class GameSelectionService : ReactiveObject
+{
+    #region Singleton
+    private static readonly Lazy<GameSelectionService> _instance =
+        new Lazy<GameSelectionService>(() => new GameSelectionService());
+
+    public static GameSelectionService Instance => _instance.Value;
+    #endregion
+
+    #region Events
+    public event Action<SupportedGame>? GameChanged;
+    #endregion
+
+    #region Properties
+    private SupportedGame _selectedGame = SupportedGame.ACC; // Default game
+
+    public SupportedGame SelectedGame => _selectedGame;
+    #endregion
+
+    #region Constructor
+    // Private constructor for singleton
+    private GameSelectionService()
+    {
+    }
+    #endregion
+
+    #region Public Methods
+
+    /// <summary>
+    /// Updates the selected game and performs any game-specific initialization logic
+    /// </summary>
+    /// <param name="game">The game identifier</param>
+    /// <returns>True if the selection was valid and processed, false otherwise</returns>
+    public bool SelectGame(SupportedGame game)
+    {
+        if (game == _selectedGame)
+            return false;
+
+        _selectedGame = game;
+        GameChanged?.Invoke(game); // Convert SupportedGame enum to string
+        return true;
+    }
+    /// <summary>
+    /// Updates the selected game (internal - only used by MainTopMenuViewModel)
+    /// </summary>
+    public void UpdateSelectedGame(SupportedGame game)
+    {
+        _selectedGame = game;
+    }
+
+    // Helper methods to check for specific games
+    public bool IsIRacing => SelectedGame == SupportedGame.IRacing;
+    public bool IsACC => SelectedGame == SupportedGame.ACC;
+    public bool IsACEvo => SelectedGame == SupportedGame.ACEvo;
+    public bool IsLMU => SelectedGame == SupportedGame.LMU;
+    #endregion
+}