Add Experimental Avalonia Renderer Package and Catalog Sample.

.gitignore

@@ -232,5 +232,3 @@ SixLabors.Shapes.Coverage.xml
 .codex-*
 .claude
 /plans/
-
-samples/Avalonia**

samples/AvaloniaControlCatalog/App.xaml

@@ -0,0 +1,97 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ControlCatalog.ViewModels"
+             x:DataType="vm:ApplicationViewModel"
+             Name="Avalonia ControlCatalog"
+             x:Class="ControlCatalog.App">
+  <Application.Resources>
+    <ResourceDictionary>
+      <!-- Custom controls defined in other assemblies -->
+      <ResourceDictionary.MergedDictionaries>
+        <ResourceInclude Source="avares://ControlCatalog/ScrollPage.xaml"/>
+        <ResourceInclude Source="avares://ControlCatalog/NavHeaderItem.xaml"/>
+      </ResourceDictionary.MergedDictionaries>
+
+      <!-- Resources used only in the control catalog -->
+      <ResourceDictionary.ThemeDictionaries>
+        <ResourceDictionary x:Key="Default">
+          <Color x:Key="CatalogBaseLowColor">#33000000</Color>
+          <Color x:Key="CatalogBaseMediumColor">#99000000</Color>
+          <Color x:Key="CatalogChromeMediumColor">#FFE6E6E6</Color>
+          <Color x:Key="CatalogBaseHighColor">#FF000000</Color>
+        </ResourceDictionary>
+        <ResourceDictionary x:Key="Dark">
+          <Color x:Key="CatalogBaseLowColor">#33FFFFFF</Color>
+          <Color x:Key="CatalogBaseMediumColor">#99FFFFFF</Color>
+          <Color x:Key="CatalogChromeMediumColor">#FF1F1F1F</Color>
+          <Color x:Key="CatalogBaseHighColor">#FFFFFFFF</Color>
+        </ResourceDictionary>
+      </ResourceDictionary.ThemeDictionaries>
+
+      <!-- Styles attached dynamically depending on current theme (simple or fluent) -->
+      <FluentTheme x:Key="FluentTheme" />
+      <SimpleTheme x:Key="SimpleTheme" />
+      <StyleInclude x:Key="ColorPickerFluent" Source="avares://Avalonia.Controls.ColorPicker/Themes/Fluent/Fluent.xaml" />
+      <StyleInclude x:Key="ColorPickerSimple" Source="avares://Avalonia.Controls.ColorPicker/Themes/Simple/Simple.xaml" />
+    </ResourceDictionary>
+  </Application.Resources>
+  <Application.Styles>
+    <Style Selector="TextBlock.h1, TextBlock.h2, TextBlock.h3">
+      <Setter Property="TextWrapping" Value="Wrap" />
+    </Style>
+    <Style Selector="TextBlock.h1">
+      <Setter Property="FontSize" Value="16" />
+      <Setter Property="FontWeight" Value="Medium" />
+    </Style>
+    <Style Selector="TextBlock.h2">
+      <Setter Property="FontSize" Value="14" />
+    </Style>
+    <Style Selector="TextBlock.h3">
+      <Setter Property="FontSize" Value="12" />
+    </Style>
+    <Style Selector="Label.h1">
+      <Setter Property="FontSize" Value="16" />
+      <Setter Property="FontWeight" Value="Medium" />
+    </Style>
+    <Style Selector="Label.h2">
+      <Setter Property="FontSize" Value="14" />
+    </Style>
+    <Style Selector="Label.h3">
+      <Setter Property="FontSize" Value="12" />
+    </Style>
+    <Style Selector="RefreshContainer">
+      <Setter Property="IsMouseEnabled" Value="true" />
+    </Style>
+  </Application.Styles>
+  <NativeDock.Menu>
+    <NativeMenu>
+      <NativeMenuItem Header="New Window" Click="OnDockNewWindowClicked"/>
+      <NativeMenuItemSeparator/>
+      <NativeMenuItem Header="Show Main Window" Click="OnDockShowMainWindowClicked"/>
+      <NativeMenuItemSeparator/>
+      <NativeMenuItem Header="Add Dock Menu Item" Click="OnDockAddItemClicked"/>
+    </NativeMenu>
+  </NativeDock.Menu>
+  <TrayIcon.Icons>
+    <TrayIcons>
+      <TrayIcon Icon="/Assets/test_icon.ico" MacOSProperties.IsTemplateIcon="true" ToolTipText="Avalonia Tray Icon ToolTip">
+        <TrayIcon.Menu>
+          <NativeMenu>
+            <NativeMenuItem Header="Settings">
+              <NativeMenu>
+                <NativeMenuItem Header="Option 1" ToggleType="Radio" IsChecked="True" />
+                <NativeMenuItem Header="Option 2" ToggleType="Radio" />
+                <NativeMenuItemSeparator />
+                <NativeMenuItem Header="Option 3" ToggleType="CheckBox" IsChecked="True" />
+                <NativeMenuItem Icon="/Assets/test_icon.ico" Header="Restore Defaults" Command="{Binding RestoreDefault}" />
+                <NativeMenuItem Header="Disabled option" IsEnabled="False" />
+                <NativeMenuItem Header="Hidden option" IsVisible="False" />
+              </NativeMenu>
+            </NativeMenuItem>
+            <NativeMenuItem Header="Exit" Command="{Binding ExitCommand}" />
+          </NativeMenu>
+        </TrayIcon.Menu>
+      </TrayIcon>
+    </TrayIcons>
+  </TrayIcon.Icons>
+</Application>

samples/AvaloniaControlCatalog/App.xaml.cs

@@ -0,0 +1,164 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Avalonia.Platform;
+using Avalonia.Styling;
+using Avalonia.Themes.Simple;
+using Avalonia.Themes.Fluent;
+using ControlCatalog.Models;
+using ControlCatalog.ViewModels;
+
+namespace ControlCatalog
+{
+    public class App : Application
+    {
+        private readonly Styles _themeStylesContainer = new();
+        private FluentTheme? _fluentTheme;
+        private SimpleTheme? _simpleTheme;
+        private IStyle? _colorPickerFluent, _colorPickerSimple;
+
+        public App()
+        {
+            DataContext = new ApplicationViewModel();
+        }
+
+        public override void Initialize()
+        {
+            Styles.Add(_themeStylesContainer);
+
+            AvaloniaXamlLoader.Load(this);
+
+            _fluentTheme = (FluentTheme)Resources["FluentTheme"]!;
+            _simpleTheme = (SimpleTheme)Resources["SimpleTheme"]!;
+            _colorPickerFluent = (IStyle)Resources["ColorPickerFluent"]!;
+            _colorPickerSimple = (IStyle)Resources["ColorPickerSimple"]!;
+
+            SetCatalogThemes(CatalogTheme.Fluent);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime)
+            {
+                desktopLifetime.MainWindow = new MainWindow { DataContext = new MainWindowViewModel() };
+            }
+            else if (ApplicationLifetime is IActivityApplicationLifetime singleViewFactoryApplicationLifetime)
+            {
+                singleViewFactoryApplicationLifetime.MainViewFactory = () => new PageNavigationHost()
+                {
+                    Page = new MainView { DataContext = new MainWindowViewModel() }
+                };
+            }
+            else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewLifetime)
+            {
+                singleViewLifetime.MainView = new PageNavigationHost()
+                {
+                    Page = new MainView { DataContext = new MainWindowViewModel() }
+                };
+            }
+
+            if (this.TryGetFeature<IActivatableLifetime>() is { } activatableApplicationLifetime)
+            {
+                activatableApplicationLifetime.Activated += (sender, args) =>
+                    Console.WriteLine($"App activated: {args.Kind}");
+                activatableApplicationLifetime.Deactivated += (sender, args) =>
+                    Console.WriteLine($"App deactivated: {args.Kind}");
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+
+        public void OnDockNewWindowClicked(object? sender, EventArgs e)
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime)
+            {
+                var window = new MainWindow();
+                window.Show();
+            }
+        }
+
+        public void OnDockShowMainWindowClicked(object? sender, EventArgs e)
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime)
+            {
+                desktopLifetime.MainWindow?.Activate();
+            }
+        }
+
+        private int _dockMenuItemCount;
+
+        public void OnDockAddItemClicked(object? sender, EventArgs e)
+        {
+            var dockMenu = NativeDock.GetMenu(this);
+            if (dockMenu is not null)
+            {
+                _dockMenuItemCount++;
+                var item = new NativeMenuItem($"New item {_dockMenuItemCount}");
+                item.Click += (_, _) =>
+                {
+                    dockMenu.Items.Remove(item);
+                };
+                dockMenu.Items.Insert(0, item);
+            }
+        }
+
+        private CatalogTheme _prevTheme;
+        public static CatalogTheme CurrentTheme => ((App)Current!)._prevTheme;
+        public static void SetCatalogThemes(CatalogTheme theme)
+        {
+            var app = (App)Current!;
+            var prevTheme = app._prevTheme;
+            app._prevTheme = theme;
+            var shouldReopenWindow = prevTheme != theme;
+
+            if (app._themeStylesContainer.Count == 0)
+            {
+                app._themeStylesContainer.Add(new Style());
+                app._themeStylesContainer.Add(new Style());
+                app._themeStylesContainer.Add(new Style());
+            }
+
+            if (theme == CatalogTheme.Fluent)
+            {
+                app._themeStylesContainer[0] = app._fluentTheme!;
+                app._themeStylesContainer[1] = app._colorPickerFluent!;
+            }
+            else if (theme == CatalogTheme.Simple)
+            {
+                app._themeStylesContainer[0] = app._simpleTheme!;
+                app._themeStylesContainer[1] = app._colorPickerSimple!;
+            }
+
+            if (shouldReopenWindow)
+            {
+                if (app.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime)
+                {
+                    var oldWindow = desktopLifetime.MainWindow;
+                    var newWindow = new MainWindow()
+                    {
+                        DataContext = new MainWindowViewModel()
+                    };
+                    desktopLifetime.MainWindow = newWindow;
+                    newWindow.Show();
+                    oldWindow?.Close();
+                }
+                else if (app.ApplicationLifetime is IActivityApplicationLifetime singleViewFactoryApplicationLifetime)
+                {
+                    singleViewFactoryApplicationLifetime.MainViewFactory = () => new PageNavigationHost()
+                    {
+                        Page = new MainView { DataContext = new MainWindowViewModel() }
+                    };
+                }
+                else if (app.ApplicationLifetime is ISingleViewApplicationLifetime singleViewLifetime)
+                {
+                    singleViewLifetime.MainView = new PageNavigationHost()
+                    {
+                        Page = new MainView { DataContext = new MainWindowViewModel() }
+                    };
+                }
+            }
+        }
+    }
+}