wip

Toolkit.Avalonia/ContentControlHandler.cs

@@ -19,7 +19,7 @@ public class ContentControlHandler :
                     control.Loaded -= HandleLoaded;
                     if (control.DataContext is object content)
                     {
-                        if (content is IInitializer initializer)
+                        if (content is IInitialization initializer)
                         {
                             await initializer.Initialize();
                         }

Toolkit.Avalonia/ContentDialogHandler.cs

@@ -129,7 +129,7 @@ public class ContentDialogHandler(IDispatcher dispatcher) :
 
                     // A hack to wait for the dialog to finish loading up to make it appear more responsive
                     await Task.Delay(250);
-                    if (content is IInitializer initializer)
+                    if (content is IInitialization initializer)
                     {
                         await initializer.Initialize();
                     }

Toolkit.Avalonia/ContentTemplate.cs

@@ -16,10 +16,10 @@ public class ContentTemplate :
         {
             if (observableViewModel.Provider is IServiceProvider provider)
             {
-                IContentTemplateDescriptorProvider? contentTemplateProvider = provider.GetService<IContentTemplateDescriptorProvider>();
-                INavigationRegion? viewModelContentBinder = provider.GetService<INavigationRegion>();
+                Type itemType = item.GetType();
 
-                if (contentTemplateProvider?.Get(item.GetType().Name) is IContentTemplateDescriptor descriptor)
+                if (provider.GetRequiredKeyedService<IContentTemplateDescriptor>(itemType.Name.Replace("ViewModel", ""))
+                    is IContentTemplateDescriptor descriptor)
                 {
                     if (provider.GetRequiredKeyedService(descriptor.TemplateType, descriptor.Key) is Control control)
                     {
@@ -28,7 +28,7 @@ public class ContentTemplate :
                             control.Loaded -= HandleLoaded;
                             if (control.DataContext is object content)
                             {
-                                if (content is IInitializer initializer)
+                                if (content is IInitialization initializer)
                                 {
                                     await initializer.Initialize();
                                 }

Toolkit.Avalonia/FrameHandler.cs

@@ -72,7 +72,7 @@ public class FrameHandler :
                         sender.AddHandler(Frame.NavigatingFromEvent, HandleNavigatingFrom);
                         if (sender.DataContext is object content)
                         {
-                            if (content is IInitializer initializer)
+                            if (content is IInitialization initializer)
                             {
                                 await initializer.Initialize();
                             }

Toolkit.Avalonia/IServiceCollectionExtensions.cs

@@ -3,6 +3,7 @@ using Avalonia.Controls.ApplicationLifetimes;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Toolkit.Foundation;
+using Toolkit.UI.Controls.Avalonia;
 
 namespace Toolkit.Avalonia;
 
@@ -128,11 +129,11 @@ public static class IServiceCollectionExtensions
         services.AddTransient<IContentTemplate, ContentTemplate>();
         services.AddTransient<INavigationRegion, NavigationRegion>();
 
-        services.AddNavigateHandler<ClassicDesktopStyleApplicationHandler>();
-        services.AddNavigateHandler<SingleViewApplicationHandler>();
-        services.AddNavigateHandler<ContentControlHandler>();
-        services.AddNavigateHandler<FrameHandler>();
-        services.AddNavigateHandler<ContentDialogHandler>();
+        services.AddHandler<ClassicDesktopStyleApplicationHandler>(nameof(IClassicDesktopStyleApplicationLifetime));
+        services.AddHandler<SingleViewApplicationHandler>(nameof(ISingleViewApplicationLifetime));
+        services.AddHandler<ContentControlHandler>(nameof(ContentControl));
+        services.AddHandler<FrameHandler>(nameof(Frame));
+        services.AddHandler<ContentDialogHandler>(nameof(ContentDialog));
 
         services.AddScoped<INavigationRegionCollection, NavigationRegionCollection>(provider => new NavigationRegionCollection
         {
@@ -144,15 +145,13 @@ public static class IServiceCollectionExtensions
             new ProxyServiceCollection<IComponentBuilder>(services =>
             {
                 services.AddSingleton(provider.GetRequiredService<IDispatcher>());
-
-                services.AddTransient<IContentTemplateDescriptorProvider, ContentTemplateDescriptorProvider>();
                 services.AddTransient<IContentTemplate, ContentTemplate>();
 
                 services.AddTransient<INavigationRegion, NavigationRegion>();
 
-                services.AddNavigateHandler<ContentControlHandler>();
-                services.AddNavigateHandler<FrameHandler>();
-                services.AddNavigateHandler<ContentDialogHandler>();
+                services.AddHandler<ContentControlHandler>(nameof(ContentControl));
+                services.AddHandler<FrameHandler>(nameof(Frame));
+                services.AddHandler<ContentDialogHandler>(nameof(ContentDialog));
             })));
 
         return services;

Toolkit.Foundation/AppService.cs

@@ -2,13 +2,13 @@
 
 namespace Toolkit.Foundation;
 
-public class AppService(IEnumerable<IInitializer> initializers,
+public class AppService(IEnumerable<IInitialization> initializers,
     IPublisher publisher) :
     IHostedService
 {
     public async Task StartAsync(CancellationToken cancellationToken)
     {
-        foreach (IInitializer initializer in initializers)
+        foreach (IInitialization initializer in initializers)
         {
             await initializer.Initialize();
         }

Toolkit.Foundation/ChangedEventArgs.cs

@@ -1,3 +1,3 @@
 namespace Toolkit.Foundation;
 
-public record ChangedEventArgs<TSender>(TSender? Sender = default);
+public record ChangedEventArgs<TSender>(TSender? Sender = default);

Toolkit.Foundation/CommandValueViewModel.cs

@@ -6,7 +6,7 @@ public partial class CommandValueViewModel<TValue>(IServiceProvider provider,
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
-    ISubscription subscriber,
+    ISubscriber subscriber,
     IDisposer disposer) :
     ValueViewModel<TValue>(provider, factory, mediator, publisher, subscriber, disposer)
 {

Toolkit.Foundation/CommandViewModel.cs

@@ -6,7 +6,7 @@ public partial class CommandViewModel(IServiceProvider provider,
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
-    ISubscription subscriber,
+    ISubscriber subscriber,
     IDisposer disposer) :
     Observable(provider, factory, mediator, publisher, subscriber, disposer)
 {

Toolkit.Foundation/ComponentBuilder.cs

@@ -32,14 +32,13 @@ public class ComponentBuilder :
                 services.AddScoped<SubscriptionCollection>();
 
                 services.AddTransient<IHandlerProvider, HandlerProvider>();
-                services.AddScoped<ISubscription, Subscription>();
-
+                services.AddScoped<ISubscriber, Subscriber>();
                 services.AddTransient<IPublisher, Publisher>();
-
                 services.AddTransient<IMediator, Mediator>();
+
+                services.AddTransient<IContentFactory, ContentFactory>();
                 services.AddTransient<INavigationScope, NavigationScope>();
 
-                services.AddTransient<INavigationProvider, NavigationProvider>();
                 services.AddScoped<INavigationRegionCollection, NavigationRegionCollection>();
                 services.AddTransient<INavigationRegionProvider, NavigationRegionProvider>();
 

Toolkit.Foundation/ComponentConfigurationViewModel.cs

@@ -12,7 +12,7 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, THe
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer,
         THeader header,
         TDescription description,
@@ -30,7 +30,7 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TAc
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
-    ISubscription subscriber,
+    ISubscriber subscriber,
     IDisposer disposer,
     TAction action,
     TConfiguration configuration,
@@ -72,7 +72,7 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TDe
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
-    ISubscription subscriber,
+    ISubscriber subscriber,
     IDisposer disposer,
     TAction action,
     TDescription description,

Toolkit.Foundation/ComponentHost.cs

@@ -4,7 +4,7 @@ using Microsoft.Extensions.Hosting;
 namespace Toolkit.Foundation;
 
 public class ComponentHost(IServiceProvider services,
-    IEnumerable<IInitializer> initializers,
+    IEnumerable<IInitialization> initializers,
     IEnumerable<IHostedService> hostedServices) :
     IComponentHost
 {
@@ -21,7 +21,7 @@ public class ComponentHost(IServiceProvider services,
 
     public async Task StartAsync(CancellationToken cancellationToken = default)
     {
-        foreach (IInitializer initializer in initializers)
+        foreach (IInitialization initializer in initializers)
         {
             await initializer.Initialize();
         }

Toolkit.Foundation/ComponentInitializer.cs

@@ -7,7 +7,7 @@ public class ComponentInitializer(IEnumerable<IComponent> components,
     IComponentHostCollection hosts,
     IComponentScopeCollection scopes,
     IServiceProvider provider) :
-    IInitializer
+    IInitialization
 {
     public async Task Initialize()
     {

Toolkit.Foundation/ConfigurationInitializer.cs

@@ -5,7 +5,7 @@ public class ConfigurationInitializer<TConfiguration>(IConfigurationReader<TConf
     IConfigurationFactory<TConfiguration> factory,
     IPublisher publisher) :
     IConfigurationInitializer<TConfiguration>,
-    IInitializer
+    IInitialization
     where TConfiguration :
     class
 {

Toolkit.Foundation/ContentFactory.cs

@@ -0,0 +1,46 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Toolkit.Foundation;
+
+public class ContentFactory(IMediator mediator,
+    IServiceProvider provider,
+    IServiceFactory factory) : IContentFactory
+{
+    public async Task<object?> CreateAsync(IContentTemplateDescriptor descriptor, 
+        object[] parameters)
+    {
+        Type createEventType = typeof(CreateEventArgs<>).MakeGenericType(descriptor.ContentType);
+
+        object? content = null;
+        if (Activator.CreateInstance(createEventType, [null, parameters]) is object createEvent)
+        {
+            content = await mediator.Handle(descriptor.ContentType, createEvent, descriptor.Key);
+        }
+
+        if (content is null)
+        {
+            if (parameters is { Length: > 0 })
+            {
+                content = factory.Create(descriptor.ContentType, args =>
+                {
+                    if (args is IPostInitialization initialization)
+                    {
+                        initialization.PostInitialize();
+                    }
+                }, parameters);
+            }
+            else
+            {
+                content = provider.GetRequiredKeyedService(descriptor.ContentType, args =>
+                    {
+                        if (args is IPostInitialization initialization)
+                        {
+                            initialization.PostInitialize();
+                        }
+                    }, descriptor.Key);
+            }
+        }
+
+        return content;
+    }
+}

Toolkit.Foundation/ContentTemplateDescriptorProvider.cs

@@ -1,16 +0,0 @@
-namespace Toolkit.Foundation;
-
-public class ContentTemplateDescriptorProvider(IEnumerable<IContentTemplateDescriptor> contentTemplates) :
-    IContentTemplateDescriptorProvider
-{
-    public IContentTemplateDescriptor? Get(object key)
-    {
-        if (contentTemplates.FirstOrDefault(x => x.Key.Equals(key) || x.Key.Equals($"{key}".Replace("ViewModel", "")))
-            is IContentTemplateDescriptor viewModelTemplate)
-        {
-            return viewModelTemplate;
-        }
-
-        return default;
-    }
-}

Toolkit.Foundation/DefaultHostBuilder.cs

@@ -29,9 +29,9 @@ public class DefaultHostBuilder :
                 services.AddScoped<SubscriptionCollection>();
 
                 services.AddTransient<IHandlerProvider, HandlerProvider>();
-                services.AddTransient<ISubscription, Subscription>();
+                services.AddTransient<ISubscriber, Subscriber>();
 
-                services.AddTransient<ISubscription, Subscription>();
+                services.AddTransient<ISubscriber, Subscriber>();
 
                 services.AddTransient<IPublisher, Publisher>();
                 services.AddTransient<IMediator, Mediator>();
@@ -45,9 +45,7 @@ public class DefaultHostBuilder :
                 services.AddScoped<IProxyService<IComponentHostCollection>>(provider =>
                     new ProxyService<IComponentHostCollection>(provider.GetRequiredService<IComponentHostCollection>()));
 
-                services.AddTransient<IContentTemplateDescriptorProvider, ContentTemplateDescriptorProvider>();
-
-                services.AddTransient<INavigationProvider, NavigationProvider>();
+                services.AddTransient<IContentFactory, ContentFactory>();
 
                 services.AddScoped<INavigationRegionCollection, NavigationRegionCollection>();
                 services.AddTransient<INavigationRegionProvider, NavigationRegionProvider>();

Toolkit.Foundation/IConfigurationChanged.cs

@@ -1,4 +1,4 @@
 namespace Toolkit.Foundation;
 
 public interface IConfigurationChanged<TConfiguration> :
-    IInitializer;
+    IInitialization;

Toolkit.Foundation/IContentFactory.cs

@@ -0,0 +1,8 @@
+
+namespace Toolkit.Foundation
+{
+    public interface IContentFactory
+    {
+        Task<object?> CreateAsync(IContentTemplateDescriptor descriptor, object[] resolvedArguments);
+    }
+}

Toolkit.Foundation/IContentTemplateDescriptorProvider.cs

@@ -1,6 +0,0 @@
-namespace Toolkit.Foundation;
-
-public interface IContentTemplateDescriptorProvider
-{
-    IContentTemplateDescriptor? Get(object key);
-}

Toolkit.Foundation/IHostBuilderExtension.cs

@@ -156,7 +156,7 @@ public static class IHostBuilderExtension
                 services.TryAddKeyedTransient<IConfigurationFactory<TConfiguration>>(section, (provider, key) =>
                     new ConfigurationFactory<TConfiguration>(() => defaultConfiguration ?? provider.GetRequiredKeyedService<TConfiguration>(key)));
 
-                services.AddTransient<IInitializer, ConfigurationInitializer<TConfiguration>>(provider =>
+                services.AddTransient<IInitialization, ConfigurationInitializer<TConfiguration>>(provider =>
                     new ConfigurationInitializer<TConfiguration>(provider.GetRequiredKeyedService<IConfigurationReader<TConfiguration>>(section),
                         provider.GetRequiredKeyedService<IConfigurationWriter<TConfiguration>>(section),
                         provider.GetRequiredKeyedService<IConfigurationFactory<TConfiguration>>(section),

Toolkit.Foundation/IInitialization.cs

@@ -1,11 +1,11 @@
 namespace Toolkit.Foundation;
 
-public interface IInitializer
+public interface IInitialization
 {
     Task Initialize();
 }
 
-public interface IInitializer<T>
+public interface IInitialization<T>
 {
     Task<T> Initialize();
 }

Toolkit.Foundation/INavigationProvider.cs

@@ -1,6 +0,0 @@
-namespace Toolkit.Foundation;
-
-public interface INavigationProvider
-{
-    INavigation? Get(Type type);
-}

Toolkit.Foundation/IPostInitialization.cs

@@ -0,0 +1,6 @@
+namespace Toolkit.Foundation;
+
+public interface IPostInitialization
+{
+    void PostInitialize();
+}

Toolkit.Foundation/IServiceCollectionExtensions.cs

@@ -1,8 +1,6 @@
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.DependencyInjection.Extensions;
 
 namespace Toolkit.Foundation;
-
 public static class IServiceCollectionExtensions
 {
     public static IServiceCollection AddCache<TKey, TValue>(this IServiceCollection services)
@@ -132,31 +130,9 @@ public static class IServiceCollectionExtensions
 
     public static IServiceCollection AddInitializer<TInitializer>(this IServiceCollection services)
         where TInitializer : class,
-        IInitializer
+        IInitialization
     {
-        services.AddTransient<IInitializer, TInitializer>();
-        return services;
-    }
-
-    public static IServiceCollection AddNavigateHandler<THandler>(this IServiceCollection services)
-        where THandler : INavigateHandler,
-        IHandler
-    {
-        IEnumerable<Type> contracts = typeof(THandler).GetInterfaces()
-            .Where(x => x.Name == typeof(INavigateHandler<>).Name || x.Name == typeof(INavigateBackHandler<>).Name);
-
-        foreach (Type contract in contracts)
-        {
-            if (contract.GetGenericArguments() is { Length: 1 } arguments)
-            {
-                services.AddTransient<INavigation>(provider => new Navigation
-                {
-                    Type = arguments[0]
-                });
-            }
-        }
-
-        services.AddHandler<THandler>();
+        services.AddTransient<IInitialization, TInitializer>();
         return services;
     }
 
@@ -205,7 +181,7 @@ public static class IServiceCollectionExtensions
 
         services.Add(new ServiceDescriptor(viewType, key, viewType, serviceLifetime));
 
-        services.AddTransient<IContentTemplateDescriptor>(provider =>
+        services.AddKeyedTransient<IContentTemplateDescriptor>(key, (provider, _) =>
             new ContentTemplateDescriptor(key, viewModelType, viewType, parameters));
 
         return services;

Toolkit.Foundation/IServiceFactory.cs

@@ -7,5 +7,8 @@ public interface IServiceFactory
     TService Create<TService>(Action<TService> serviceDelegate,
         params object?[]? parameters);
 
+    object Create(Type type, Action<object> serviceDelegate,
+        params object?[]? parameters);
+
     TService Create<TService>(params object?[]? parameters);
 }

Toolkit.Foundation/IServiceProviderExtensions.cs

@@ -0,0 +1,17 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Toolkit.Foundation;
+
+public static class IServiceProviderExtensions
+{
+    public static object GetRequiredKeyedService(this IServiceProvider provider, 
+        Type serviceType, 
+        Action<object> serviceDelegate, 
+        object? serviceKey)
+    {
+        object service = provider.GetRequiredKeyedService(serviceType, serviceKey);
+        serviceDelegate.Invoke(service);
+
+        return service;
+    }
+}

Toolkit.Foundation/ISubscriber.cs

@@ -0,0 +1,8 @@
+namespace Toolkit.Foundation;
+
+public interface ISubscriber
+{
+    void Subscribe(object subscriber);
+
+    void Unsubscribe(object subscriber);
+}

Toolkit.Foundation/ISubscriberRequired.cs

@@ -0,0 +1,6 @@
+namespace Toolkit.Foundation;
+
+public interface ISubscriberRequired
+{
+    ISubscriber Subscription { get; }
+}

Toolkit.Foundation/ISubscription.cs

@@ -1,8 +0,0 @@
-namespace Toolkit.Foundation;
-
-public interface ISubscription
-{
-    void Add(object subscriber);
-
-    void Remove(object subscriber);
-}

Toolkit.Foundation/ISubscriptionRequired.cs

@@ -1,6 +0,0 @@
-namespace Toolkit.Foundation;
-
-public interface ISubscriptionRequired
-{
-    ISubscription Subscription { get; }
-}

Toolkit.Foundation/NavigationProvider.cs

@@ -1,16 +0,0 @@
-namespace Toolkit.Foundation;
-
-public class NavigationProvider(IEnumerable<INavigation> navigations) :
-    INavigationProvider
-{
-    public INavigation? Get(Type type)
-    {
-        if (navigations.FirstOrDefault(x => type == x.Type ||
-            type.BaseType == x.Type) is INavigation navigation)
-        {
-            return navigation;
-        }
-
-        return default;
-    }
-}

Toolkit.Foundation/NavigationRegionProvider.cs

@@ -1,15 +1,15 @@
 namespace Toolkit.Foundation;
 
-public class NavigationRegionProvider(INavigationRegionCollection contexts) :
+public class NavigationRegionProvider(INavigationRegionCollection collection) :
     INavigationRegionProvider
 {
     public object? Get(object key) =>
-        contexts.TryGetValue(key, out object? target) ? target : default;
+        collection.TryGetValue(key, out object? target) ? target : default;
 
     public bool TryGet(object name,
         out object? value)
     {
-        if (contexts.TryGetValue(name,
+        if (collection.TryGetValue(name,
             out object? target))
         {
             value = target;

Toolkit.Foundation/NavigationScope.cs

@@ -2,13 +2,10 @@
 
 namespace Toolkit.Foundation;
 
-public class NavigationScope(IPublisher publisher,
-    IMediator mediator,
-    IServiceProvider provider,
-    IServiceFactory factory,
-    INavigationProvider navigationProvider,
+public class NavigationScope(IServiceProvider provider,
     INavigationRegionProvider navigationRegionProvider,
-    IContentTemplateDescriptorProvider contentTemplateDescriptorProvider) :
+    IContentFactory contentFactory,
+    IPublisher publisher) :
     INavigationScope
 {
     public async void Navigate(string route,
@@ -30,7 +27,7 @@ public class NavigationScope(IPublisher publisher,
         {
             currentSegmentIndex++;
 
-            if (contentTemplateDescriptorProvider.Get(segment)
+            if (provider.GetKeyedService<IContentTemplateDescriptor>(segment) 
                 is IContentTemplateDescriptor descriptor)
             {
                 Dictionary<string, object>? arguments = parameters?.ToDictionary(x => x.Key, x => x.Value, StringComparer.InvariantCultureIgnoreCase) ?? [];
@@ -42,14 +39,15 @@ public class NavigationScope(IPublisher publisher,
                          .TryGetValue(x.Name, out object? argument) ? argument : default)
                      .Where(argument => argument is not null)] : [];
 
-                if (provider.GetRequiredKeyedService(descriptor.TemplateType, segment) is object view)
+                if (provider.GetRequiredKeyedService(descriptor.TemplateType, descriptor.Key)
+                    is object template)
                 {
                     if (region is not null)
                     {
                         switch (region)
                         {
                             case "self":
-                                region = view;
+                                region = template;
                                 break;
 
                             default:
@@ -64,38 +62,18 @@ public class NavigationScope(IPublisher publisher,
 
                     if (region is not null)
                     {
-                        Type createEventType = typeof(CreateEventArgs<>).MakeGenericType(descriptor.ContentType);
-
-                        object? content = null;
-                        if (Activator.CreateInstance(createEventType, [null, resolvedArguments]) is object createEvent)
-                        {
-                            content = await mediator.Handle(descriptor.ContentType, createEvent, descriptor.Key);
-                        }
-
-                        if (content is null)
-                        {
-                            if (resolvedArguments is { Length: > 0 })
-                            {
-                                content = factory.Create(descriptor.ContentType, resolvedArguments);
-                            }
-                            else
-                            {
-                                content = provider.GetRequiredKeyedService(descriptor.ContentType, segment);
-                            }
-                        }
-
+                        object? content = await contentFactory.CreateAsync(descriptor, resolvedArguments);
                         if (content is not null)
                         {
-                            if (navigationProvider.Get(region is Type type ? type : region.GetType()) is INavigation navigation)
+                            Type navigationType = region is Type type ? type : region.GetType();
+                            Type navigateEventType = typeof(NavigateEventArgs<>).MakeGenericType(navigationType);
+                            if (Activator.CreateInstance(navigateEventType, [region, template, content, sender, parameters])
+                                is object navigateEvent)
                             {
-                                Type navigateEventType = typeof(NavigateEventArgs<>).MakeGenericType(navigation.Type);
-                                if (Activator.CreateInstance(navigateEventType, [region, view, content, sender, parameters]) is object navigateEvent)
+                                publisher.Publish(navigateEvent, navigationType.Name);
+                                if (currentSegmentIndex == segmentCount)
                                 {
-                                    publisher.Publish(navigateEvent);
-                                    if (currentSegmentIndex == segmentCount)
-                                    {
-                                        navigated?.Invoke(this, EventArgs.Empty);
-                                    }
+                                    navigated?.Invoke(this, EventArgs.Empty);
                                 }
                             }
                         }
@@ -114,14 +92,11 @@ public class NavigationScope(IPublisher publisher,
 
         if (region is not null)
         {
-            if (navigationProvider.Get(region is Type type ? type : region.GetType())
-                is INavigation navigation)
+            Type navigationType = region is Type type ? type : region.GetType();
+            Type navigateType = typeof(NavigateBackEventArgs<>).MakeGenericType(navigationType);
+            if (Activator.CreateInstance(navigateType, [region]) is object navigate)
             {
-                Type navigateType = typeof(NavigateBackEventArgs<>).MakeGenericType(navigation.Type);
-                if (Activator.CreateInstance(navigateType, [region]) is object navigate)
-                {
-                    publisher.Publish(navigate);
-                }
+                publisher.Publish(navigate);
             }
         }
     }

Toolkit.Foundation/NavigationTargetAttribute.cs

@@ -1,8 +0,0 @@
-namespace Toolkit.Foundation;
-
-[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = false)]
-public class NavigationTargetAttribute(string name) :
-    Attribute
-{
-    public string Name => name;
-}

Toolkit.Foundation/Observable.cs

@@ -2,11 +2,18 @@
 
 namespace Toolkit.Foundation;
 
-public partial class Observable :
+public partial class Observable(IServiceProvider
+        provider,
+    IServiceFactory factory,
+    IMediator mediator,
+    IPublisher publisher,
+    ISubscriber subscriber,
+    IDisposer disposer) :
     ObservableObject,
     IObservableViewModel,
     IActivityIndicator,
-    IInitializer,
+    IPostInitialization,
+    IInitialization,
     IActivated,
     IDeactivating,
     IDeactivated,
@@ -20,40 +27,25 @@ public partial class Observable :
 {
     private readonly Dictionary<string, object> trackedProperties = [];
 
-    [ObservableProperty]
-    private bool initialized;
-
     [ObservableProperty]
     private bool active;
 
-    public Observable(IServiceProvider
-        provider,
-        IServiceFactory factory,
-        IMediator mediator,
-        IPublisher publisher,
-        ISubscription subscriber,
-        IDisposer disposer)
-    {
-        Provider = provider;
-        Factory = factory;
-        Mediator = mediator;
-        Publisher = publisher;
-        Disposer = disposer;
-
-        subscriber.Add(this);
-    }
+    [ObservableProperty]
+    private bool initialized;
+    private bool postInitialized;
 
     public event EventHandler? DeactivateHandler;
 
-    public IDisposer Disposer { get; }
+    public IDisposer Disposer { get; } = disposer;
 
-    public IServiceFactory Factory { get; }
+    public IServiceFactory Factory { get; } = factory;
 
-    public IMediator Mediator { get; }
+    public IMediator Mediator { get; } = mediator;
 
-    public IServiceProvider Provider { get; }
+    public IServiceProvider Provider { get; } = provider;
 
-    public IPublisher Publisher { get; }
+    public IPublisher Publisher { get; } = publisher;
+    public ISubscriber Subscriber { get; } = subscriber;
 
     public void Commit()
     {
@@ -95,6 +87,17 @@ public partial class Observable :
     public virtual Task OnDeactivating() =>
         Task.CompletedTask;
 
+    public virtual void PostInitialize()
+    {
+        if (postInitialized)
+        {
+            return;
+        }
+
+        postInitialized = true;
+        Subscriber.Subscribe(this);
+    }
+
     public void Revert()
     {
         foreach (object trackedProperty in trackedProperties.Values)
@@ -124,7 +127,7 @@ public partial class Observable<TValue> :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer,
         TValue value) : base(provider, factory, mediator, publisher, subscriber, disposer)
     {
@@ -154,7 +157,7 @@ public partial class Observable<TKey, TValue> :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher, 
-        ISubscription subscriber, 
+        ISubscriber subscriber, 
         IDisposer disposer,
         TKey key,
         TValue value) : base(provider, factory, mediator, publisher, subscriber, disposer)

Toolkit.Foundation/ObservableCollection.cs

@@ -9,7 +9,8 @@ namespace Toolkit.Foundation;
 public partial class ObservableCollection<TItem> :
     ObservableObject,
     IObservableCollectionViewModel<TItem>,
-    IInitializer,
+    IPostInitialization,
+    IInitialization,
     IActivated,
     IDeactivating,
     IDeactivated,
@@ -32,7 +33,7 @@ public partial class ObservableCollection<TItem> :
     INotificationHandler<MoveToEventArgs<TItem>>,
     INotificationHandler<ReplaceEventArgs<TItem>>,
     INotificationHandler<SelectionEventArgs<TItem>>
-    where TItem : notnull, 
+    where TItem : notnull,
     IDisposable
 {
     private readonly System.Collections.ObjectModel.ObservableCollection<TItem> collection = [];
@@ -52,6 +53,8 @@ public partial class ObservableCollection<TItem> :
     [ObservableProperty]
     private bool initialized;
 
+    private bool postInitialized;
+
     [ObservableProperty]
     private TItem? selectedItem;
 
@@ -59,17 +62,16 @@ public partial class ObservableCollection<TItem> :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer)
     {
         Provider = provider;
         Factory = factory;
         Mediator = mediator;
         Publisher = publisher;
+        Subscriber = subscriber;
         Disposer = disposer;
 
-        subscriber.Add(this);
-
         dispatcher = Provider.GetRequiredService<IDispatcher>();
         collection.CollectionChanged += OnCollectionChanged;
     }
@@ -78,7 +80,7 @@ public partial class ObservableCollection<TItem> :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer,
         IEnumerable<TItem> items)
     {
@@ -86,10 +88,9 @@ public partial class ObservableCollection<TItem> :
         Factory = factory;
         Mediator = mediator;
         Publisher = publisher;
+        Subscriber = subscriber;
         Disposer = disposer;
 
-        subscriber.Add(this);
-
         dispatcher = Provider.GetRequiredService<IDispatcher>();
         collection.CollectionChanged += OnCollectionChanged;
 
@@ -117,6 +118,7 @@ public partial class ObservableCollection<TItem> :
     public IServiceProvider Provider { get; private set; }
 
     public IPublisher Publisher { get; private set; }
+    public ISubscriber Subscriber { get; }
 
     object ICollection.SyncRoot => this;
 
@@ -149,18 +151,19 @@ public partial class ObservableCollection<TItem> :
         where T :
         TItem
     {
-        T? item = Factory.Create<T>(parameters);
+        T? item = Factory.Create<T>(args => 
+        { 
+            if (args is IPostInitialization initialization)
+            {
+                initialization.PostInitialize();
+            }
+        }, parameters);
+
         Add(item);
 
         return item;
     }
 
-    public void Clear(Action<ObservableCollection<TItem>> factory)
-    {
-        Clear();
-        factory.Invoke(this);
-    }
-
     public void Add(TItem item)
     {
         int index = collection.Count;
@@ -200,6 +203,11 @@ public partial class ObservableCollection<TItem> :
         }
     }
 
+    public void Clear(Action<ObservableCollection<TItem>> factory)
+    {
+        Clear();
+        factory.Invoke(this);
+    }
     public void Clear()
     {
         clearing = true;
@@ -246,17 +254,6 @@ public partial class ObservableCollection<TItem> :
         Disposer.Dispose(this);
     }
 
-    public void Fetch(bool reset = false)
-    {
-        if (reset)
-        {
-            Clear();
-        }
-
-        SynchronizeExpression expression = BuildAggregateExpression();
-        Publisher.PublishUI(expression.Value, expression.Key);
-    }
-
     public void Fetch(Func<SynchronizeExpression> aggregateDelegate,
         bool reset = false)
     {
@@ -268,6 +265,7 @@ public partial class ObservableCollection<TItem> :
         SynchronizeExpression expression = aggregateDelegate.Invoke();
         Publisher.PublishUI(expression.Value, expression.Key);
     }
+
     public IEnumerator<TItem> GetEnumerator() =>
         collection.GetEnumerator();
 
@@ -413,7 +411,7 @@ public partial class ObservableCollection<TItem> :
         }
 
         Initialized = true;
-        Fetch();
+        Synchronize();
 
         return Task.CompletedTask;
     }
@@ -423,14 +421,21 @@ public partial class ObservableCollection<TItem> :
         where T :
         TItem
     {
-        T? item = Factory.Create<T>(parameters);
+        T? item = Factory.Create<T>(args =>
+        {
+            if (args is IPostInitialization initialization)
+            {
+                initialization.PostInitialize();
+            }
+        }, parameters);
+
         InsertItem(index, item);
         UpdateSelection(item);
 
         return item;
     }
 
-    public void Insert(int index, 
+    public void Insert(int index,
         TItem item)
     {
         InsertItem(index, item);
@@ -516,6 +521,17 @@ public partial class ObservableCollection<TItem> :
     public virtual Task OnDeactivating() =>
         Task.CompletedTask;
 
+    public virtual void PostInitialize()
+    {
+        if (postInitialized)
+        {
+            return;
+        }
+
+        postInitialized = true;
+        Subscriber.Subscribe(this);
+    }
+
     public bool Remove(TItem item)
     {
         int index = collection.IndexOf(item);
@@ -574,6 +590,16 @@ public partial class ObservableCollection<TItem> :
         }
     }
 
+    public void Synchronize(bool reset = false)
+    {
+        if (reset)
+        {
+            Clear();
+        }
+
+        SynchronizeExpression expression = BuildAggregateExpression();
+        Publisher.PublishUI(expression.Value, expression.Key);
+    }
     public void Track<T>(string propertyName, Func<T> getter, Action<T> setter)
     {
         if (!trackedProperties.ContainsKey(propertyName))
@@ -657,7 +683,7 @@ public partial class ObservableCollection<TValue, TViewModel>(IServiceProvider p
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
-    ISubscription subscriber, 
+    ISubscriber subscriber, 
     IDisposer disposer,
     TValue value) : ObservableCollection<TViewModel>(provider, factory, mediator, publisher, subscriber, disposer)
     where TViewModel : notnull, IDisposable
@@ -690,7 +716,7 @@ public partial class ObservableCollection<TViewModel, TKey, TValue> :
         IServiceFactory factory, 
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer,
         TKey key,
         TValue value) : base(provider, factory, mediator, publisher, subscriber, disposer)
@@ -703,7 +729,7 @@ public partial class ObservableCollection<TViewModel, TKey, TValue> :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber, 
+        ISubscriber subscriber, 
         IDisposer disposer, 
         IEnumerable<TViewModel> items,
         TKey key,
@@ -728,7 +754,7 @@ public class ObservableCollection :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer) : base(provider, factory, mediator, publisher, subscriber, disposer)
     {
     }
@@ -737,7 +763,7 @@ public class ObservableCollection :
         IServiceFactory factory,
         IMediator mediator,
         IPublisher publisher,
-        ISubscription subscriber,
+        ISubscriber subscriber,
         IDisposer disposer,
         IEnumerable<IDisposable> items) : base(provider, factory, mediator, publisher, subscriber, disposer, items)
     {

Toolkit.Foundation/ServiceFactory.cs

@@ -17,4 +17,13 @@ public class ServiceFactory(Func<Type, object?[]?, object> factory) :
 
     public object Create(Type type, params object?[]? parameters) =>
         factory(type, parameters);
+
+    public object Create(Type type, Action<object> serviceDelegate, 
+        params object?[]? parameters)
+    {
+        object service = factory(type, parameters);
+        serviceDelegate.Invoke(service);
+
+        return service;
+    }
 }

Toolkit.Foundation/Subscriber.cs

@@ -2,11 +2,11 @@
 
 namespace Toolkit.Foundation;
 
-public class Subscription(SubscriptionCollection subscriptions,
+public class Subscriber(SubscriptionCollection subscriptions,
     IDisposer disposer) :
-    ISubscription
+    ISubscriber
 {
-    public void Add(object subscriber)
+    public void Subscribe(object subscriber)
     {
         Type handlerType = subscriber.GetType();
 
@@ -45,7 +45,7 @@ public class Subscription(SubscriptionCollection subscriptions,
         }
     }
 
-    public void Remove(object subscriber)
+    public void Unsubscribe(object subscriber)
     {
         Type handlerType = subscriber.GetType();
         IDictionary<Type, List<object>> subscribers = GetSubscriptionKeys(subscriber);

Toolkit.Foundation/ValueViewModel.cs

@@ -6,7 +6,7 @@ public partial class ValueViewModel<TValue>(IServiceProvider provider,
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
-    ISubscription subscriber,
+    ISubscriber subscriber,
     IDisposer disposer) :
     Observable(provider, factory, mediator, publisher, subscriber, disposer)
 {