wip

Toolkit.Foundation/ObservableConfiguration.cs

@@ -0,0 +1,34 @@
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Toolkit.Foundation;
+
+public partial class ObservableConfiguration<TConfiguration, TValue>(IServiceProvider provider,
+    IServiceFactory factory,
+    IMessenger messenger,
+    IDisposer disposer,
+    TConfiguration configuration,
+    IWritableConfiguration<TConfiguration> writer,
+    Func<TConfiguration, TValue?> read,
+    Action<TValue?, TConfiguration> write) :
+    Observable<TValue>(provider, factory, messenger, disposer),
+    IHandler<ChangedEventArgs<TConfiguration>>
+    where TConfiguration : class
+{
+    public void Handle(ChangedEventArgs<TConfiguration> args)
+    {
+        if (args.Sender is TConfiguration configuration)
+        {
+            Value = read(configuration);
+        }
+    }
+
+    protected override void Activated() => Value = read(configuration);
+
+    protected override void Changed(TValue? value)
+    {
+        if (IsActive)
+        {
+            writer.Write(args => write(value, args));
+        }
+    }
+}