Add SettingsManager.ObservePropertyChanged

Author: ionite34

StabilityMatrix.Core/Services/ISettingsManager.cs

@@ -91,6 +91,15 @@ IDisposable RegisterPropertyChangedHandler<T>(
         Action<T> onPropertyChanged
     );
 
+    /// <summary>
+    /// Creates an observable sequence that notifies when the specified settings property changes.
+    /// Emits the initial value upon subscription and subsequent changes.
+    /// </summary>
+    /// <typeparam name="T">The type of the property value.</typeparam>
+    /// <param name="settingsProperty">An expression representing the settings property to observe.</param>
+    /// <returns>An observable sequence of the property's values.</returns>
+    IObservable<T> ObservePropertyChanged<T>(Expression<Func<Settings, T>> settingsProperty);
+
     /// <summary>
     /// Attempts to locate and set the library path
     /// Return true if found, false otherwise

StabilityMatrix.Core/Services/SettingsManager.cs

@@ -301,6 +301,20 @@ Action<T> onPropertyChanged
             });
     }
 
+    /// <inheritdoc />
+    public IObservable<T> ObservePropertyChanged<T>(Expression<Func<Settings, T>> settingsProperty)
+    {
+        var settingsAccessor = CompiledExpression.CreateAccessor(settingsProperty);
+
+        return Observable
+            .FromEventPattern<EventHandler<RelayPropertyChangedEventArgs>, RelayPropertyChangedEventArgs>(
+                h => SettingsPropertyChanged += h,
+                h => SettingsPropertyChanged -= h
+            )
+            .Where(args => args.EventArgs.PropertyName == settingsAccessor.FullName)
+            .Select(_ => settingsAccessor.Get(Settings));
+    }
+
     /// <summary>
     /// Attempts to locate and set the library path
     /// Return true if found, false otherwise