Added features:Ursa.ReactiveUIExtension

src/Ursa.ReactiveUI/AssemblyInfo.cs

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+using Avalonia.Metadata;
+
+[assembly: XmlnsDefinition("https://irihi.tech/ursa", "Ursa.ReactiveUIExtension")]

src/Ursa.ReactiveUI/ReactiveUrsaView.cs

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+using Avalonia;
+using ReactiveUI;
+using Ursa.Controls;
+
+/* These codes are ported from Avalonia.ReactiveUI.
+ * **/
+
+namespace Ursa.ReactiveUIExtension;
+/// <summary>
+/// A ReactiveUI <see cref="UrsaView"/> that implements the <see cref="IViewFor{TViewModel}"/> interface and
+/// will activate your ViewModel automatically if the view model implements <see cref="IActivatableViewModel"/>.
+/// When the DataContext property changes, this class will update the ViewModel property with the new DataContext
+/// value, and vice versa.
+/// </summary>
+/// <typeparam name="TViewModel">ViewModel type.</typeparam>
+public class ReactiveUrsaView<TViewModel> : UrsaView, IViewFor<TViewModel> where TViewModel : class
+{
+	[System.Diagnostics.CodeAnalysis.SuppressMessage("AvaloniaProperty", "AVP1002", Justification = "Generic avalonia property is expected here.")]
+	public static readonly StyledProperty<TViewModel?> ViewModelProperty = AvaloniaProperty
+		.Register<ReactiveUrsaView<TViewModel>, TViewModel?>(nameof(ViewModel));
+
+	/// <summary>
+	/// Initializes a new instance of the <see cref="ReactiveUrsaView{TViewModel}"/> class.
+	/// </summary>
+	public ReactiveUrsaView()
+	{
+		// This WhenActivated block calls ViewModel's WhenActivated
+		// block if the ViewModel implements IActivatableViewModel.
+		this.WhenActivated(disposables => { });
+	}
+
+	/// <summary>
+	/// The ViewModel.
+	/// </summary>
+	public TViewModel? ViewModel
+	{
+		get => GetValue(ViewModelProperty);
+		set => SetValue(ViewModelProperty, value);
+	}
+
+	object? IViewFor.ViewModel
+	{
+		get => ViewModel;
+		set => ViewModel = (TViewModel?)value;
+	}
+
+	protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+	{
+		base.OnPropertyChanged(change);
+
+		if (change.Property == DataContextProperty) {
+			if (ReferenceEquals(change.OldValue, ViewModel)
+				&& change.NewValue is null or TViewModel) {
+				SetCurrentValue(ViewModelProperty, change.NewValue);
+			}
+		}
+		else if (change.Property == ViewModelProperty) {
+			if (ReferenceEquals(change.OldValue, DataContext)) {
+				SetCurrentValue(DataContextProperty, change.NewValue);
+			}
+		}
+	}
+}

src/Ursa.ReactiveUI/ReactiveUrsaWindow.cs

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+using Avalonia;
+using ReactiveUI;
+using Ursa.Controls;
+
+/* These codes are ported from Avalonia.ReactiveUI.
+ * **/
+
+namespace Ursa.ReactiveUIExtension;
+/// <summary>
+/// A ReactiveUI <see cref="UrsaWindow"/> that implements the <see cref="IViewFor{TViewModel}"/> interface and will
+/// activate your ViewModel automatically if the view model implements <see cref="IActivatableViewModel"/>. When
+/// the DataContext property changes, this class will update the ViewModel property with the new DataContext value,
+/// and vice versa.
+/// </summary>
+/// <typeparam name="TViewModel">ViewModel type.</typeparam>
+public class ReactiveUrsaWindow<TViewModel> : UrsaWindow, IViewFor<TViewModel> where TViewModel : class
+{
+	[System.Diagnostics.CodeAnalysis.SuppressMessage("AvaloniaProperty", "AVP1002", Justification = "Generic avalonia property is expected here.")]
+	public static readonly StyledProperty<TViewModel?> ViewModelProperty = AvaloniaProperty
+		.Register<ReactiveUrsaWindow<TViewModel>, TViewModel?>(nameof(ViewModel));
+
+	/// <summary>
+	/// Initializes a new instance of the <see cref="ReactiveUrsaWindow{TViewModel}"/> class.
+	/// </summary>
+	public ReactiveUrsaWindow()
+	{
+		// This WhenActivated block calls ViewModel's WhenActivated
+		// block if the ViewModel implements IActivatableViewModel.
+		this.WhenActivated(disposables => { });
+	}
+
+	/// <summary>
+	/// The ViewModel.
+	/// </summary>
+	public TViewModel? ViewModel
+	{
+		get => GetValue(ViewModelProperty);
+		set => SetValue(ViewModelProperty, value);
+	}
+
+	object? IViewFor.ViewModel
+	{
+		get => ViewModel;
+		set => ViewModel = (TViewModel?)value;
+	}
+
+	protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+	{
+		base.OnPropertyChanged(change);
+
+		if (change.Property == DataContextProperty) {
+			if (ReferenceEquals(change.OldValue, ViewModel)
+				&& change.NewValue is null or TViewModel) {
+				SetCurrentValue(ViewModelProperty, change.NewValue);
+			}
+		}
+		else if (change.Property == ViewModelProperty) {
+			if (ReferenceEquals(change.OldValue, DataContext)) {
+				SetCurrentValue(DataContextProperty, change.NewValue);
+			}
+		}
+	}
+}

src/Ursa.ReactiveUI/Ursa.ReactiveUIExtension.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFrameworks>netstandard2.0;net8</TargetFrameworks>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<LangVersion>latest</LangVersion>
+		<Authors>WCKFWCKY</Authors>
+		<PackageId>Irihi.Ursa.ReactiveUIExtension</PackageId>
+		<PackageIcon>irihi.png</PackageIcon>
+		<PackageProjectUrl>https://github.com/irihitech/Ursa.Avalonia</PackageProjectUrl>
+		<PackageLicenseExpression>MIT</PackageLicenseExpression>
+		<Nullable>enable</Nullable>
+		<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
+		<Description>This is a Ursa expansion. This package integrates and is compatible with UrsaWindow and UrsaView with Avalonia.ReactiveUI. [Avalonia.ReactiveU See: https://docs.avaloniaui.net/zh-Hans/docs/concepts/reactiveui/]
+
+这个是一个Ursa拓展包。这个包整合并互相兼容了UrsaWindow和UrsaView与Avalonia.ReactiveUI的功能。【Avalonia.ReactiveU参见：https://docs.avaloniaui.net/docs/concepts/reactiveui/】</Description>
+		<Version>1.0.1</Version>
+		<Copyright>WCKFWCKY</Copyright>
+		<RepositoryUrl>https://github.com/irihitech/Ursa.Avalonia</RepositoryUrl>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Avalonia.ReactiveUI" Version="11.1.1" />
+		<PackageReference Include="Irihi.Ursa" Version="1.3.0" />
+	</ItemGroup>
+
+</Project>