Fixed disposer?

Hyperbar.Widget.MediaController.Windows/MediaButtonView.xaml

@@ -4,7 +4,8 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:interactions="using:Microsoft.Xaml.Interactions.Core"
-    xmlns:interactivity="using:Microsoft.Xaml.Interactivity">
+    xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
+    Visibility="{x:Bind ViewModel.Visible, Mode=OneWay}">
     <UserControl.Resources>
         <SolidColorBrush x:Key="ButtonBackground" Color="Transparent" />
         <SolidColorBrush x:Key="ButtonBorderBrush" Color="Transparent" />

Hyperbar.Widget.MediaController.Windows/MediaButtonView.xaml.cs

@@ -8,4 +8,6 @@ public sealed partial class MediaButtonView :
 {
     public MediaButtonView() =>
         this.InitializeComponent(ref _contentLoaded);
+
+    private MediaButtonViewModel ViewModel => (MediaButtonViewModel)DataContext;
 }

Hyperbar.Widget.MediaController.Windows/MediaButtonViewModel.cs

@@ -2,14 +2,7 @@
 
 namespace Hyperbar.Widget.MediaController.Windows;
 
-public class MediaButtonViewModel :
-    WidgetButtonViewModel,
-    IInitialization, 
-    INotificationHandler<Changed<PlaybackInformation>>
-{
-    private readonly PlaybackButtonType buttonType;
-
-    public MediaButtonViewModel(IServiceFactory serviceFactory,
+public class MediaButtonViewModel(IServiceFactory serviceFactory,
     IMediator mediator,
     IDisposer disposer,
     ITemplateFactory templateFactory,
@@ -17,12 +10,11 @@ public class MediaButtonViewModel :
     Guid guid = default,
     string? text = null,
     string? icon = null,
-        RelayCommand? command = null) : base (serviceFactory, mediator, disposer, templateFactory, guid, text, icon, command)
-    {
-        this.buttonType = buttonType;
-        mediator.Subscribe(this);
-    }
-
+    RelayCommand? command = null) :
+    WidgetButtonViewModel(serviceFactory, mediator, disposer, templateFactory, guid, text, icon, command),
+    IInitialization, 
+    INotificationHandler<Changed<PlaybackInformation>>
+{
     public Task Handle(Changed<PlaybackInformation> notification, 
         CancellationToken cancellationToken)
     {
@@ -31,10 +23,10 @@ public class MediaButtonViewModel :
             switch (buttonType)
             {
                 case PlaybackButtonType.Play:
-                    Visible = information.Status is PlaybackStatus.Playing;
+                    Visible = information.Status is PlaybackStatus.Paused;
                 break;
                 case PlaybackButtonType.Pause:
-                    Visible = information.Status is PlaybackStatus.Paused;
+                    Visible = information.Status is PlaybackStatus.Playing;
                     break;
             }
         }

Hyperbar.Widget.MediaController.Windows/MediaControllerHandler.cs

@@ -5,28 +5,31 @@ namespace Hyperbar.Widget.MediaController.Windows;
 public class MediaControllerHandler(IMediator mediator,
     IServiceScopeProvider<MediaController> scopeProvider,
     ICache<MediaController, MediaControllerViewModel> cache) :
-    INotificationHandler<Created<MediaController>>
+    INotificationHandler<Created<MediaController>>,
+    INotificationHandler<Removed<MediaController>>
 {
     public async Task Handle(Created<MediaController> notification,
         CancellationToken cancellationToken)
     {
-        if (notification.Value is MediaController mediaController)
+        if (notification.Value is MediaController mediaController &&
+            scopeProvider.TryGet(mediaController, out IServiceScope? serviceScope) &&
+            serviceScope?.ServiceProvider.GetService<IFactory<MediaController, MediaControllerViewModel?>>() 
+                is IFactory<MediaController, MediaControllerViewModel?> factory &&
+            factory.Create(mediaController) is MediaControllerViewModel viewModel)
         {
-            if (scopeProvider.TryGet(mediaController, out IServiceScope? serviceScope))
+            cache.Add(mediaController, viewModel);
+            await mediator.PublishAsync(new Created<MediaControllerViewModel>(viewModel), cancellationToken);
+        }
+    }
 
-                if (serviceScope is not null)
+    public async Task Handle(Removed<MediaController> notification, CancellationToken cancellationToken)
     {
-                    if (serviceScope.ServiceProvider.GetService<IFactory<MediaController, MediaControllerViewModel?>>()
-                        is IFactory<MediaController, MediaControllerViewModel?> factory)
+        if (notification.Value is MediaController mediaController &&
+            cache.TryGetValue(mediaController, out MediaControllerViewModel? viewModel) &&
+            viewModel is not null)
         {
-                        if (factory.Create(mediaController) is MediaControllerViewModel mediaControllerViewModel)
-                        {
-                            cache.Add(mediaController, mediaControllerViewModel);
-                            await mediator.PublishAsync(new Created<MediaControllerViewModel>(mediaControllerViewModel),
-                                cancellationToken);
-                        }
-                    }
-                }
+            await mediator.PublishAsync(new Removed<MediaControllerViewModel>(viewModel), cancellationToken);
+            cache.Remove(mediaController);
         }
     }
 }

Hyperbar.Widget.MediaController.Windows/MediaControllerManager.cs

@@ -48,7 +48,7 @@ public class MediaControllerManager(IMediator mediator,
             {
                 if (!sessions.Any(x => x.SourceAppUserModelId == session.Key.SourceAppUserModelId))
                 {
-                    await dispatcher.InvokeAsync(() => disposer.Dispose(session.Value));
+                    await mediator.PublishAsync(new Removed<MediaController>(session.Value));
                     cache.Remove(session);
                 }
             }

Hyperbar.Widget.MediaController.Windows/MediaControllerViewModel.cs

@@ -30,8 +30,6 @@ public class MediaControllerViewModel :
         Add<MediaButtonViewModel>(PlaybackButtonType.Forward, 
             "Forward", "\uEB9D",
                 new RelayCommand(async () => await mediator.PublishAsync<Forward>()));
-
-        mediator.Subscribe(this);
     }
 
     public ITemplateFactory TemplateFactory { get; set; }

Hyperbar/Lifecycles/Cache.cs

@@ -41,16 +41,6 @@ public class Cache<TKey, TValue>(IDisposer disposer) :
         TValue value)
     {
         cache.TryAdd(key, value);
-
-        disposer.Add(value, Disposable.Create(() =>
-        {
-            Remove(key);
-        }));
-
-        disposer.Add(key, Disposable.Create(() =>
-        {
-            Remove(key);
-        }));
     }
 
     public void Clear() => cache.Clear();

Hyperbar/Lifecycles/IObservableCollectionViewModel.cs

@@ -1,10 +1,3 @@
-using System.Collections;
-using System.Collections.Specialized;
+namespace Hyperbar;
 
-namespace Hyperbar;
-
-public interface IObservableCollectionViewModel<TItem> : 
-    IList<TItem>,
-    IList,
-    IReadOnlyList<TItem>,
-    INotifyCollectionChanged;
+public interface IObservableCollectionViewModel<TItem>;

Hyperbar/Lifecycles/ObservableCollectionViewModel.cs

@@ -11,6 +11,10 @@ namespace Hyperbar;
 public partial class ObservableCollectionViewModel<TItem> :
     ObservableObject,
     IObservableCollectionViewModel<TItem>,
+    IList<TItem>,
+    IList,
+    IReadOnlyList<TItem>,
+    INotifyCollectionChanged,
     INotificationHandler<Removed<TItem>>,
     INotificationHandler<Created<TItem>>,
     INotificationHandler<Inserted<TItem>>,
@@ -134,6 +138,12 @@ public partial class ObservableCollectionViewModel<TItem> :
         InsertItem(index, item);
     }
 
+    public void Add(object item)
+    {
+        int index = collection.Count;
+        InsertItem(index, (TItem)item);
+    }
+
     int IList.Add(object? value)
     {
         TItem? item = default;
@@ -159,7 +169,15 @@ public partial class ObservableCollectionViewModel<TItem> :
         }
     }
 
-    public void Clear() => ClearItems();
+    public void Clear()
+    {
+        foreach (TItem item in collection)
+        {
+            Disposer.Dispose(item);
+        }
+
+        ClearItems();
+    }
 
     public bool Contains(TItem item) =>
         collection.Contains(item);
@@ -173,8 +191,11 @@ public partial class ObservableCollectionViewModel<TItem> :
     void ICollection.CopyTo(Array array, int index) =>
         collection.CopyTo((TItem[])array, index);
 
-    public void Dispose() =>
+    public virtual void Dispose()
+    {
+        GC.SuppressFinalize(this);
         Disposer.Dispose(this);
+    }
 
     public System.Collections.Generic.IEnumerator<TItem> GetEnumerator() =>
         collection.GetEnumerator();
@@ -187,15 +208,9 @@ public partial class ObservableCollectionViewModel<TItem> :
     {
         foreach (TItem item in this.ToList())
         {
-            if (notification.Value is not null)
+            if (notification.Value is not null && notification.Value.Equals(item))
             {
-                if (notification.Value.Equals(item))
-                {
-                    if (item is IDisposable disposable)
-                    {
-                        disposable.Dispose();
-                    }
-                }
+                Remove(item);
             }
         }
 
@@ -279,7 +294,7 @@ public partial class ObservableCollectionViewModel<TItem> :
             return false;
         }
 
-        Disposer.Remove(this, item);
+        Disposer.Dispose(item);
         RemoveItem(index);
 
         return true;
@@ -302,14 +317,13 @@ public partial class ObservableCollectionViewModel<TItem> :
     protected virtual void InsertItem(int index,
         TItem value)
     {
-        Disposer.Add(this, Disposable.Create(() =>
+        Disposer.Add(this, value);
+        Disposer.Add(value, value, Disposable.Create(() =>
         {
-            Remove(value);
-        }));
-
-        Disposer.Add(value, Disposable.Create(() =>
+            if (value is IList collection)
             {
-            Remove(value);
+                collection.Clear();
+            }
         }));
 
         collection.Insert(index, value);

Hyperbar/Mediators/Mediator.cs

@@ -8,7 +8,7 @@ public class Mediator(IServiceProvider provider,
     IDispatcher dispatcher) :
     IMediator
 {
-    private readonly ConcurrentDictionary<object, List<dynamic>> subjects = [];
+    private readonly ConcurrentDictionary<object, List<dynamic>> subscriptions = [];
 
     public Task PublishAsync<TNotification>(object key,
         CancellationToken cancellationToken = default)
@@ -46,11 +46,14 @@ public class Mediator(IServiceProvider provider,
         List<INotificationHandler<TNotification>> handlers =
             provider.GetServices<INotificationHandler<TNotification>>().ToList();
 
-        foreach (KeyValuePair<object, List<dynamic>> handler in subjects)
+        foreach (KeyValuePair<object, List<dynamic>> subscriber in subscriptions)
         {
-            if (key is not null && handler.Key.Equals(key) || handler.Key.Equals(typeof(TNotification)))
+            if (subscriber.Key.Equals($"{(key is not null ? $"{key}:" : "")}{typeof(TNotification)}"))
             {
-                handlers.Add(handler.Value[0]);
+                foreach (dynamic handler in subscriber.Value)
+                {
+                    handlers.Add(handler);
+                }
             }
         }
 
@@ -111,14 +114,9 @@ public class Mediator(IServiceProvider provider,
 
         foreach (Type interfaceType in GetNotificationHandlerInterfaces(handlerType))
         {
-            if (interfaceType.GetGenericArguments().FirstOrDefault() 
-                is Type argumentType)
+            if (interfaceType.GetGenericArguments().FirstOrDefault() is Type argumentType)
             {
-                if (object.Equals(key, default))
-                {
-
-                }
-                subjects.AddOrUpdate(key ?? argumentType, new List<object> { handler }, (value, collection) =>
+                subscriptions.AddOrUpdate($"{(key is not null ? $"{key}:" : "")}{argumentType}", new List<object> { handler }, (value, collection) =>
                 {
                     collection.Add(handler);
                     return collection;