Refactor theme management to use ValueListenableBuilder for effective theme updates

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

example/lib/main.dart

@@ -270,9 +270,6 @@ class ArcaneThemeExample extends StatelessWidget {
     super.key,
   });
 
-  static final Listenable themeListenable =
-      Listenable.merge([Arcane.theme.darkTheme, Arcane.theme.lightTheme]);
-
   @override
   Widget build(BuildContext context) {
     return Card(
@@ -313,8 +310,10 @@ class ArcaneThemeExample extends StatelessWidget {
                 Row(
                   mainAxisSize: MainAxisSize.min,
                   children: [
-                    Checkbox(
+                    ValueListenableBuilder<bool>(
-                      value: Arcane.theme.isFollowingSystemTheme,
+                      valueListenable: Arcane.theme.followingSystemThemeChanges,
+                      builder: (context, isFollowingSystem, _) => Checkbox(
+                        value: isFollowingSystem,
                         onChanged: (value) {
                           final ThemeMode oldTheme =
                               Arcane.theme.currentThemeMode;
@@ -345,6 +344,7 @@ class ArcaneThemeExample extends StatelessWidget {
                           }
                         },
                       ),
+                    ),
                     const Text("Follow system"),
                   ],
                 ),
@@ -359,8 +359,9 @@ class ArcaneThemeExample extends StatelessWidget {
                   const Text("Color"),
                   Expanded(
                     child: ValueListenableBuilder<ThemeData>(
-                      valueListenable: Arcane.theme.themeDataChanges,
+                      valueListenable: Arcane.theme.effectiveThemeChanges,
-                      builder: (context, themeData, _) => ListView.separated(
+                      builder: (context, effectiveTheme, _) =>
+                          ListView.separated(
                         itemCount: colors.length,
                         scrollDirection: Axis.horizontal,
                         separatorBuilder: (_, __) => const SizedBox(width: 4),
@@ -387,23 +388,34 @@ class ArcaneThemeExample extends StatelessWidget {
                                 "Setting ${Arcane.theme.currentThemeMode.name} theme color to ${colors[index].name}",
                               );
                             },
-                            child: ValueListenableBuilder<ThemeMode>(
+                            child: Container(
-                              valueListenable: Arcane.theme.themeModeChanges,
+                              key: Key(
-                              builder: (context, themeMode, _) {
+                                  "${colors[index]}-${Arcane.theme.currentThemeMode}"),
-                                return Container(
-                                  key: Key("${colors[index]}-${themeMode}"),
                               decoration: BoxDecoration(
                                 color: colors[index],
                                 border:
-                                        themeData.colorScheme.primary.name ==
+                                    effectiveTheme.colorScheme.primary.name ==
                                             colors[index].name
-                                            ? Border.all(width: 2)
+                                        ? Border.all(
+                                            width: 2,
+                                            color: Colors.white,
+                                          )
+                                        : null,
+                                boxShadow:
+                                    effectiveTheme.colorScheme.primary.name ==
+                                            colors[index].name
+                                        ? [
+                                            const BoxShadow(
+                                              color: Colors.black,
+                                              spreadRadius: 1,
+                                              blurRadius: 1,
+                                              offset: Offset(0, 0),
+                                            ),
+                                          ]
                                         : null,
                               ),
                               width: 20,
                               height: 20,
-                                );
-                              },
                             ),
                           );
                         },

lib/src/services/reactive_theme/reactive_theme_service.dart

@@ -66,6 +66,22 @@ class ArcaneReactiveTheme extends ArcaneService {
   final ValueNotifier<ThemeData> _themeNotifier =
       ValueNotifier<ThemeData>(ThemeData.light());
 
+  /// ValueListenable that rebuilds when the effective theme changes.
+  /// This includes theme mode changes and active theme data changes.
+  /// Use this for most UI components that need to react to theme changes.
+  ValueListenable<ThemeData> get effectiveThemeChanges =>
+      I._effectiveThemeNotifier;
+
+  final ValueNotifier<ThemeData> _effectiveThemeNotifier =
+      ValueNotifier<ThemeData>(ThemeData.light());
+
+  /// ValueListenable that notifies when the system theme following state changes.
+  ValueListenable<bool> get followingSystemThemeChanges =>
+      I._followingSystemThemeNotifier;
+
+  final ValueNotifier<bool> _followingSystemThemeNotifier =
+      ValueNotifier<bool>(false);
+
   // ************************************************************************ //
   // * MARK: Light/Dark theme
   // ************************************************************************ //
@@ -101,6 +117,7 @@ class ArcaneReactiveTheme extends ArcaneService {
   /// ```
   ArcaneReactiveTheme switchTheme({ThemeMode? themeMode}) {
     _followingSystemTheme = false;
+    _followingSystemThemeNotifier.value = false;
 
     if (themeMode != null) {
       _updateTheme(themeMode);
@@ -127,6 +144,7 @@ class ArcaneReactiveTheme extends ArcaneService {
   /// ```
   ArcaneReactiveTheme followSystemTheme(BuildContext context) {
     _followingSystemTheme = true;
+    _followingSystemThemeNotifier.value = true;
 
     _currentSystemThemeMode =
         context.isDarkMode ? ThemeMode.dark : ThemeMode.light;
@@ -152,6 +170,7 @@ class ArcaneReactiveTheme extends ArcaneService {
     if (_currentThemeMode == ThemeMode.dark) {
       _themeNotifier.value = theme;
       _currentTheme = theme;
+      _effectiveThemeNotifier.value = theme;
     }
 
     return I;
@@ -173,6 +192,7 @@ class ArcaneReactiveTheme extends ArcaneService {
     if (_currentThemeMode == ThemeMode.light) {
       _themeNotifier.value = theme;
       _currentTheme = theme;
+      _effectiveThemeNotifier.value = theme;
     }
 
     return I;
@@ -187,9 +207,11 @@ class ArcaneReactiveTheme extends ArcaneService {
     _darkTheme.value = ThemeData.dark();
     _lightTheme.value = ThemeData.light();
     _followingSystemTheme = false;
+    _followingSystemThemeNotifier.value = false;
     _updateTheme(ThemeMode.light);
     _themeNotifier.value = _lightTheme.value;
     _currentTheme = _lightTheme.value;
+    _effectiveThemeNotifier.value = _lightTheme.value;
   }
 
   /// Updates the current theme mode and broadcasts the change.
@@ -201,6 +223,7 @@ class ArcaneReactiveTheme extends ArcaneService {
     final ThemeData newTheme = themeMode == ThemeMode.dark ? dark : light;
     _currentTheme = newTheme;
     _themeNotifier.value = newTheme;
+    _effectiveThemeNotifier.value = newTheme;
   }
 
   /// Disposes of the theme service resources.
@@ -212,6 +235,8 @@ class ArcaneReactiveTheme extends ArcaneService {
     _systemThemeNotifier.dispose();
     _themeModeNotifier.dispose();
     _themeNotifier.dispose();
+    _effectiveThemeNotifier.dispose();
+    _followingSystemThemeNotifier.dispose();
     _darkTheme.dispose();
     _lightTheme.dispose();
     super.dispose();

test/services/authentication/authentication_service_test.mocks.dart

@@ -98,11 +98,16 @@ class MockArcaneAuthInterface extends _i1.Mock
           as _i5.Future<void>);
 
   @override
-  _i5.Future<_i2.Result<void, String>> logout() =>
+  _i5.Future<_i2.Result<void, String>> logout({
+    _i5.Future<void> Function()? onLoggedOut,
+  }) =>
       (super.noSuchMethod(
-            Invocation.method(#logout, []),
+            Invocation.method(#logout, [], {#onLoggedOut: onLoggedOut}),
             returnValue: _i5.Future<_i2.Result<void, String>>.value(
-              _FakeResult_0<void, String>(this, Invocation.method(#logout, [])),
+              _FakeResult_0<void, String>(
+                this,
+                Invocation.method(#logout, [], {#onLoggedOut: onLoggedOut}),
+              ),
             ),
           )
           as _i5.Future<_i2.Result<void, String>>);