Add Avalonia

src/PicView.Avalonia/App.axaml

@@ -0,0 +1,10 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="PicView.Avalonia.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+  
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

src/PicView.Avalonia/App.axaml.cs

@@ -0,0 +1,29 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using PicView.Avalonia.ViewModels;
+using PicView.Avalonia.Views;
+
+namespace PicView.Avalonia
+{
+    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(),
+                };
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+    }
+}

src/PicView.Avalonia/PicView.Avalonia.csproj

@@ -0,0 +1,52 @@
+<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>
+    <ApplicationIcon>Assets\icon.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Remove="Assets\icon.ico" />
+    <AvaloniaResource Remove="Assets\icon.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Remove="Assets\icon.ico" />
+    <None Remove="Assets\icon.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="Assets\icon.ico" />
+  </ItemGroup>
+
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.0.2" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.2" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.2" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.2" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.2" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.2" />
+  </ItemGroup>
+
+
+  <ItemGroup>
+    <ProjectReference Include="..\PicView.Core\PicView.Core.csproj" />
+  </ItemGroup>
+
+
+  <ItemGroup>
+    <Resource Include="Assets\icon.png" />
+    <Resource Include="Assets\icon.ico" />
+  </ItemGroup>
+</Project>

src/PicView.Avalonia/Program.cs

@@ -0,0 +1,24 @@
+using Avalonia;
+using Avalonia.ReactiveUI;
+using System;
+
+namespace PicView.Avalonia
+{
+    internal 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();
+    }
+}

src/PicView.Avalonia/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,7 @@
+namespace PicView.Avalonia.ViewModels
+{
+    public class MainWindowViewModel : ViewModelBase
+    {
+        public string Greeting => "Welcome to Avalonia!";
+    }
+}

src/PicView.Avalonia/ViewModels/ViewModelBase.cs

@@ -0,0 +1,8 @@
+using ReactiveUI;
+
+namespace PicView.Avalonia.ViewModels
+{
+    public class ViewModelBase : ReactiveObject
+    {
+    }
+}

src/PicView.Avalonia/Views/MainWindow.axaml

@@ -0,0 +1,35 @@
+<Window
+    x:Class="PicView.Avalonia.Views.MainWindow"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:vm="using:PicView.Avalonia.ViewModels"
+    Title="PicView"
+    MinWidth="462"
+    MinHeight="400"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    x:DataType="vm:MainWindowViewModel"
+    Background="Transparent"
+    ExtendClientAreaChromeHints="PreferSystemChrome"
+    ExtendClientAreaTitleBarHeightHint="-1"
+    ExtendClientAreaToDecorationsHint="True"
+    SizeToContent="WidthAndHeight"
+    TransparencyLevelHint="AcrylicBlur"
+    WindowStartupLocation="CenterScreen"
+    mc:Ignorable="d">
+
+    <Design.DataContext>
+        <!--
+            This only sets the DataContext for the previewer in an IDE,
+            to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs)
+        -->
+        <vm:MainWindowViewModel />
+    </Design.DataContext>
+
+    <TextBlock
+        HorizontalAlignment="Center"
+        VerticalAlignment="Center"
+        Text="{Binding Greeting}" />
+</Window>

src/PicView.Avalonia/Views/MainWindow.axaml.cs

@@ -0,0 +1,12 @@
+using Avalonia.Controls;
+
+namespace PicView.Avalonia.Views
+{
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

src/PicView.Avalonia/app.manifest

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embeded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="PicView.Avalonia.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

src/PicView.Core/PicView.Core.csproj

@@ -6,9 +6,17 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Remove="Assets\icon.png" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Magick.NET-Q8-OpenMP-x64" Version="13.5.0" />
     <PackageReference Include="SkiaSharp" Version="2.88.6" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Resource Include="Assets\icon.png" />
+  </ItemGroup>
+
 </Project>

src/PicView.sln

@@ -14,6 +14,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "XamlAnimatedGif", "XamlAnim
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PicView.Core", "PicView.Core\PicView.Core.csproj", "{17C701BC-1F25-4995-A7E5-1360EBC5904B}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PicView.Avalonia", "PicView.Avalonia\PicView.Avalonia.csproj", "{E36E03B2-6CAB-407F-AD72-411F43CFC5A8}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -36,6 +38,10 @@ Global
 		{17C701BC-1F25-4995-A7E5-1360EBC5904B}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{17C701BC-1F25-4995-A7E5-1360EBC5904B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{17C701BC-1F25-4995-A7E5-1360EBC5904B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E36E03B2-6CAB-407F-AD72-411F43CFC5A8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E36E03B2-6CAB-407F-AD72-411F43CFC5A8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E36E03B2-6CAB-407F-AD72-411F43CFC5A8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E36E03B2-6CAB-407F-AD72-411F43CFC5A8}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE