wip

lib/providers/stop_type_provider.dart

@@ -1,11 +1,11 @@
 import 'package:flutter/material.dart';
+import 'package:lightmeter/utils/inherited_generics.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
-import 'package:provider/provider.dart';
 
 class StopTypeProvider extends StatefulWidget {
-  final Widget? child;
+  final Widget child;
 
-  const StopTypeProvider({this.child, super.key});
+  const StopTypeProvider({required this.child, super.key});
 
   static StopTypeProviderState of(BuildContext context) {
     return context.findAncestorStateOfType<StopTypeProviderState>()!;
@@ -28,8 +28,8 @@ class StopTypeProviderState extends State<StopTypeProvider> {
 
   @override
   Widget build(BuildContext context) {
-    return Provider.value(
-      value: _stopType,
+    return InheritedWidgetBase<StopType>(
+      data: _stopType,
       child: widget.child,
     );
   }

lib/screens/metering/flow_metering.dart

@@ -10,6 +10,7 @@ import 'package:lightmeter/providers/equipment_profile_provider.dart';
 import 'package:lightmeter/screens/metering/bloc_metering.dart';
 import 'package:lightmeter/screens/metering/communication/bloc_communication_metering.dart';
 import 'package:lightmeter/screens/metering/screen_metering.dart';
+import 'package:lightmeter/utils/inherited_generics.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 import 'package:provider/provider.dart';
 
@@ -39,7 +40,7 @@ class _MeteringFlowState extends State<MeteringFlow> {
               context.read<MeteringCommunicationBloc>(),
               context.read<MeteringInteractor>(),
               EquipmentProfile.of(context, listen: false),
-              context.read<StopType>(),
+              context.get<StopType>(),
             ),
           ),
         ],

lib/screens/metering/screen_metering.dart

@@ -14,6 +14,7 @@ import 'package:lightmeter/screens/metering/components/camera_container/provider
 import 'package:lightmeter/screens/metering/components/light_sensor_container/provider_container_light_sensor.dart';
 import 'package:lightmeter/screens/metering/event_metering.dart';
 import 'package:lightmeter/screens/metering/state_metering.dart';
+import 'package:lightmeter/utils/inherited_generics.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
 class MeteringScreen extends StatefulWidget {
@@ -30,7 +31,6 @@ class _MeteringScreenState extends State<MeteringScreen> {
   void didChangeDependencies() {
     super.didChangeDependencies();
     _bloc.add(EquipmentProfileChangedEvent(EquipmentProfile.of(context)));
-    _bloc.add(StopTypeChangedEvent(context.watch<StopType>()));
     if (!MeteringScreenLayout.featureStatusOf(context, MeteringScreenLayoutFeature.filmPicker)) {
       _bloc.add(const FilmChangedEvent(Film.other()));
     }
@@ -38,39 +38,44 @@ class _MeteringScreenState extends State<MeteringScreen> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: Theme.of(context).colorScheme.background,
-      body: Column(
-        children: [
-          Expanded(
-            child: BlocBuilder<MeteringBloc, MeteringState>(
-              builder: (_, state) => _MeteringContainerBuidler(
-                fastest: state is MeteringDataState ? state.fastest : null,
-                slowest: state is MeteringDataState ? state.slowest : null,
-                exposurePairs: state is MeteringDataState ? state.exposurePairs : [],
-                film: state.film,
-                iso: state.iso,
-                nd: state.nd,
-                onFilmChanged: (value) => _bloc.add(FilmChangedEvent(value)),
-                onIsoChanged: (value) => _bloc.add(IsoChangedEvent(value)),
-                onNdChanged: (value) => _bloc.add(NdChangedEvent(value)),
+    return InheritedWidgetListener<StopType>(
+      onDidChangeDependencies: (value) {
+        context.read<MeteringBloc>().add(StopTypeChangedEvent(value));
+      },
+      child: Scaffold(
+        backgroundColor: Theme.of(context).colorScheme.background,
+        body: Column(
+          children: [
+            Expanded(
+              child: BlocBuilder<MeteringBloc, MeteringState>(
+                builder: (_, state) => _MeteringContainerBuidler(
+                  fastest: state is MeteringDataState ? state.fastest : null,
+                  slowest: state is MeteringDataState ? state.slowest : null,
+                  exposurePairs: state is MeteringDataState ? state.exposurePairs : [],
+                  film: state.film,
+                  iso: state.iso,
+                  nd: state.nd,
+                  onFilmChanged: (value) => _bloc.add(FilmChangedEvent(value)),
+                  onIsoChanged: (value) => _bloc.add(IsoChangedEvent(value)),
+                  onNdChanged: (value) => _bloc.add(NdChangedEvent(value)),
+                ),
               ),
             ),
-          ),
-          BlocBuilder<MeteringBloc, MeteringState>(
-            builder: (context, state) => MeteringBottomControlsProvider(
-              ev: state is MeteringDataState ? state.ev : null,
-              isMetering:
-                  state is LoadingState || state is MeteringDataState && state.continuousMetering,
-              hasError: state is MeteringDataState && state.hasError,
-              onSwitchEvSourceType: context.read<Environment>().hasLightSensor
-                  ? EvSourceTypeProvider.of(context).toggleType
-                  : null,
-              onMeasure: () => _bloc.add(const MeasureEvent()),
-              onSettings: () => Navigator.pushNamed(context, 'settings'),
+            BlocBuilder<MeteringBloc, MeteringState>(
+              builder: (context, state) => MeteringBottomControlsProvider(
+                ev: state is MeteringDataState ? state.ev : null,
+                isMetering:
+                    state is LoadingState || state is MeteringDataState && state.continuousMetering,
+                hasError: state is MeteringDataState && state.hasError,
+                onSwitchEvSourceType: context.read<Environment>().hasLightSensor
+                    ? EvSourceTypeProvider.of(context).toggleType
+                    : null,
+                onMeasure: () => _bloc.add(const MeasureEvent()),
+                onSettings: () => Navigator.pushNamed(context, 'settings'),
+              ),
             ),
-          ),
-        ],
+          ],
+        ),
       ),
     );
   }

lib/screens/settings/components/metering/components/fractional_stops/widget_list_tile_fractional_stops.dart

@@ -2,8 +2,8 @@ import 'package:flutter/material.dart';
 import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/providers/stop_type_provider.dart';
 import 'package:lightmeter/screens/settings/components/shared/dialog_picker.dart/widget_dialog_picker.dart';
+import 'package:lightmeter/utils/inherited_generics.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
-import 'package:provider/provider.dart';
 
 class StopTypeListTile extends StatelessWidget {
   const StopTypeListTile({super.key});
@@ -13,14 +13,14 @@ class StopTypeListTile extends StatelessWidget {
     return ListTile(
       leading: const Icon(Icons.straighten),
       title: Text(S.of(context).fractionalStops),
-      trailing: Text(_typeToString(context, context.watch<StopType>())),
+      trailing: Text(_typeToString(context, context.listen<StopType>())),
       onTap: () {
         showDialog<StopType>(
           context: context,
           builder: (_) => DialogPicker<StopType>(
             icon: Icons.straighten,
             title: S.of(context).showFractionalStops,
-            selectedValue: context.read<StopType>(),
+            selectedValue: context.get<StopType>(),
             values: StopType.values,
             titleAdapter: _typeToString,
           ),

lib/utils/inherited_generics.dart

@@ -0,0 +1,112 @@
+import 'package:flutter/widgets.dart';
+
+/// Listening to multiple dependencies at the same time causes firing an event for all dependencies
+/// even though some of them didn't change:
+/// ```dart
+/// @override
+/// void didChangeDependencies() {
+///   super.didChangeDependencies();
+///   _bloc.add(EquipmentProfileChangedEvent(EquipmentProfile.of(context)));
+///   if (!MeteringScreenLayout.featureStatusOf(context, MeteringScreenLayoutFeature.filmPicker)) {
+///     _bloc.add(const FilmChangedEvent(Film.other()));
+///   }
+/// }
+/// ```
+/// To overcome this issue I've decided to create a generic listener,
+/// that will listen to each dependency separately.
+class InheritedWidgetListener<T> extends StatefulWidget {
+  final ValueChanged<T> onDidChangeDependencies;
+  final Widget child;
+
+  const InheritedWidgetListener({
+    required this.onDidChangeDependencies,
+    required this.child,
+    super.key,
+  });
+
+  @override
+  State<InheritedWidgetListener<T>> createState() => _InheritedWidgetListenerState<T>();
+}
+
+class _InheritedWidgetListenerState<T> extends State<InheritedWidgetListener<T>> {
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    widget.onDidChangeDependencies(context.listen<T>());
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return widget.child;
+  }
+}
+
+class InheritedWidgetBase<T> extends InheritedWidget {
+  final T data;
+
+  const InheritedWidgetBase({
+    required this.data,
+    required super.child,
+    super.key,
+  });
+
+  static T of<T>(BuildContext context, {bool listen = true}) {
+    if (listen) {
+      return context.dependOnInheritedWidgetOfExactType<InheritedWidgetBase<T>>()!.data;
+    } else {
+      return context.findAncestorWidgetOfExactType<InheritedWidgetBase<T>>()!.data;
+    }
+  }
+
+  @override
+  bool updateShouldNotify(InheritedWidgetBase<T> oldWidget) => true;
+}
+
+// class InheritedModelBase<A, R> extends InheritedModel<A> {
+//   final Map<A, R> data;
+
+//   const InheritedModelBase({
+//     required this.data,
+//     required super.child,
+//     super.key,
+//   });
+
+//   static Map<A, R> of<R, A>(BuildContext context, {bool listen = true}) {
+//     if (listen) {
+//       return context.dependOnInheritedWidgetOfExactType<InheritedModelBase<A, R>>()!.data;
+//     } else {
+//       return context.findAncestorWidgetOfExactType<InheritedModelBase<A, R>>()!.data;
+//     }
+//   }
+
+//   static R featureStatusOf<A, R>(BuildContext context, A aspect) {
+//     return InheritedModel.inheritFrom<InheritedModelBase<A, R>>(context, aspect: aspect)!
+//         .data[aspect]!;
+//   }
+
+//   @override
+//   bool updateShouldNotify(InheritedModelBase oldWidget) => true;
+
+//   @override
+//   bool updateShouldNotifyDependent(
+//     InheritedModelBase<A, R> oldWidget,
+//     Set<A> dependencies,
+//   ) {
+//     for (final dependecy in dependencies) {
+//       if (oldWidget.data[dependecy] != data[dependecy]) {
+//         return true;
+//       }
+//     }
+//     return false;
+//   }
+// }
+
+extension InheritedWidgetBaseContext on BuildContext {
+  T get<T>() {
+    return InheritedWidgetBase.of<T>(this, listen: false);
+  }
+
+  T listen<T>() {
+    return InheritedWidgetBase.of<T>(this);
+  }
+}