Added UserPreferencesService

lib/application.dart

@@ -5,7 +5,9 @@ import 'package:lightmeter/data/ev_source/ev_source_type.dart';
 import 'package:lightmeter/data/permissions_service.dart';
 import 'package:lightmeter/screens/settings/settings_screen.dart';
 import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
+import 'data/shared_prefs_service.dart';
 import 'generated/l10n.dart';
 import 'res/theme.dart';
 import 'screens/metering/flow_metering.dart';
@@ -38,8 +40,15 @@ class _ApplicationState extends State<Application> {
 
   @override
   Widget build(BuildContext context) {
-    return Provider.value(
+    return FutureBuilder<SharedPreferences>(
-      value: widget.evSource,
+      future: SharedPreferences.getInstance(),
+      builder: (context, snapshot) {
+        if (snapshot.data != null) {
+          return MultiProvider(
+            providers: [
+              Provider(create: (_) => UserPreferencesService(snapshot.data!)),
+              Provider.value(value: widget.evSource),
+            ],
             child: Provider(
               create: (context) => PermissionsService(),
               child: StopTypeProvider(
@@ -69,4 +78,8 @@ class _ApplicationState extends State<Application> {
             ),
           );
         }
+        return const SizedBox();
+      },
+    );
+  }
 }

lib/data/shared_prefs_service.dart

@@ -0,0 +1,19 @@
+import 'package:lightmeter/data/models/nd_value.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'models/iso_value.dart';
+
+class UserPreferencesService {
+  static const _isoKey = "ISO";
+  static const _ndFilterKey = "ND";
+
+  final SharedPreferences _sharedPreferences;
+
+  UserPreferencesService(this._sharedPreferences);
+
+  IsoValue get iso => isoValues.firstWhere((v) => v.value == (_sharedPreferences.getInt(_isoKey) ?? 100));
+  set iso(IsoValue value) => _sharedPreferences.setInt(_isoKey, value.value);
+
+  NdValue get ndFilter => ndValues.firstWhere((v) => v.value == (_sharedPreferences.getInt(_ndFilterKey) ?? 0));
+  set ndFilter(NdValue value) => _sharedPreferences.setInt(_ndFilterKey, value.value);
+}

lib/screens/metering/bloc_metering.dart

@@ -2,12 +2,11 @@ import 'dart:async';
 import 'dart:math';
 
 import 'package:flutter_bloc/flutter_bloc.dart';
-import 'package:lightmeter/models/aperture_value.dart';
+import 'package:lightmeter/data/models/aperture_value.dart';
-import 'package:lightmeter/models/exposure_pair.dart';
+import 'package:lightmeter/data/models/exposure_pair.dart';
-import 'package:lightmeter/models/iso_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
-import 'package:lightmeter/models/nd_value.dart';
+import 'package:lightmeter/data/models/shutter_speed_value.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/shared_prefs_service.dart';
-import 'package:lightmeter/models/shutter_speed_value.dart';
 import 'package:lightmeter/screens/metering/communication/event_communication_metering.dart' as communication_events;
 import 'package:lightmeter/screens/metering/communication/state_communication_metering.dart' as communication_states;
 import 'package:lightmeter/utils/log_2.dart';
@@ -18,6 +17,7 @@ import 'state_metering.dart';
 
 class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
   final MeteringCommunicationBloc _communicationBloc;
+  final UserPreferencesService _userPreferencesService;
   late final StreamSubscription<communication_states.ScreenState> _communicationSubscription;
 
   List<ApertureValue> get _apertureValues => apertureValues.whereStopType(stopType);
@@ -25,13 +25,16 @@ class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
 
   StopType stopType;
 
-  MeteringBloc(this._communicationBloc, this.stopType)
+  MeteringBloc(
-      : super(
+    this._communicationBloc,
+    this._userPreferencesService,
+    this.stopType,
+  ) : super(
           MeteringState(
-            iso: isoValues.where((element) => element.value == 100).first,
+            iso: _userPreferencesService.iso,
             ev: 0.0,
             evCompensation: 0.0,
-            nd: ndValues.first,
+            nd: _userPreferencesService.ndFilter,
             exposurePairs: [],
           ),
         ) {
@@ -73,6 +76,7 @@ class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
   }
 
   void _onIsoChanged(IsoChangedEvent event, Emitter emit) {
+    _userPreferencesService.iso = event.isoValue;
     final ev = state.ev + log2(event.isoValue.value / state.iso.value);
     emit(MeteringState(
       iso: event.isoValue,
@@ -84,6 +88,7 @@ class MeteringBloc extends Bloc<MeteringEvent, MeteringState> {
   }
 
   void _onNdChanged(NdChangedEvent event, Emitter emit) {
+    _userPreferencesService.ndFilter = event.ndValue;
     final ev = state.ev - event.ndValue.stopReduction + state.nd.stopReduction;
     emit(MeteringState(
       iso: state.iso,

lib/screens/metering/components/exposure_pairs_list/components/exposure_pair_item.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 import 'package:lightmeter/res/dimens.dart';
 
 class ExposurePaitListItem<T extends PhotographyStopValue> extends StatelessWidget {

lib/screens/metering/components/exposure_pairs_list/exposure_pairs_list.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:lightmeter/models/exposure_pair.dart';
+import 'package:lightmeter/data/models/exposure_pair.dart';
 import 'package:lightmeter/res/dimens.dart';
 import 'package:lightmeter/screens/metering/components/exposure_pairs_list/components/exposure_pair_item.dart';
 

lib/screens/metering/components/topbar/components/dialog_picker.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:lightmeter/generated/l10n.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 import 'package:lightmeter/res/dimens.dart';
 
 typedef DialogPickerItemBuilder<T extends PhotographyValue> = Widget Function(BuildContext, T);

lib/screens/metering/components/topbar/topbar.dart

@@ -2,10 +2,10 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:lightmeter/data/ev_source/camera/bloc_camera.dart';
 import 'package:lightmeter/generated/l10n.dart';
-import 'package:lightmeter/models/exposure_pair.dart';
+import 'package:lightmeter/data/models/exposure_pair.dart';
-import 'package:lightmeter/models/iso_value.dart';
+import 'package:lightmeter/data/models/iso_value.dart';
-import 'package:lightmeter/models/nd_value.dart';
+import 'package:lightmeter/data/models/nd_value.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 import 'package:lightmeter/res/dimens.dart';
 
 import 'components/camera_preview.dart';

lib/screens/metering/event_metering.dart

@@ -1,6 +1,6 @@
-import 'package:lightmeter/models/iso_value.dart';
+import 'package:lightmeter/data/models/iso_value.dart';
-import 'package:lightmeter/models/nd_value.dart';
+import 'package:lightmeter/data/models/nd_value.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 
 abstract class MeteringEvent {
   const MeteringEvent();

lib/screens/metering/flow_metering.dart

@@ -3,7 +3,8 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:lightmeter/data/ev_source/camera/bloc_camera.dart';
 import 'package:lightmeter/data/ev_source/ev_source_type.dart';
 import 'package:lightmeter/data/ev_source/random_ev/bloc_random_ev.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
+import 'package:lightmeter/data/shared_prefs_service.dart';
 import 'package:lightmeter/screens/metering/bloc_metering.dart';
 import 'package:lightmeter/screens/metering/communication/bloc_communication_metering.dart';
 
@@ -20,6 +21,7 @@ class MeteringFlow extends StatelessWidget {
         BlocProvider(
           create: (context) => MeteringBloc(
             context.read<MeteringCommunicationBloc>(),
+            context.read<UserPreferencesService>(),
             context.read<StopType>(),
           ),
         ),

lib/screens/metering/screen_metering.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 import 'package:lightmeter/res/dimens.dart';
 import 'package:lightmeter/screens/settings/settings_screen.dart';
 

lib/screens/metering/state_metering.dart

@@ -1,6 +1,6 @@
-import 'package:lightmeter/models/exposure_pair.dart';
+import 'package:lightmeter/data/models/exposure_pair.dart';
-import 'package:lightmeter/models/iso_value.dart';
+import 'package:lightmeter/data/models/iso_value.dart';
-import 'package:lightmeter/models/nd_value.dart';
+import 'package:lightmeter/data/models/nd_value.dart';
 
 class MeteringState {
   final double ev;

lib/screens/settings/components/fractional_stops/dialog_fractional_stops.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:lightmeter/generated/l10n.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 
 class FractionalStopsDialog extends StatefulWidget {
   final StopType selectedType;

lib/screens/settings/components/fractional_stops/list_tile_fractional_stops.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:lightmeter/generated/l10n.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 import 'package:lightmeter/utils/stop_type_provider.dart';
 import 'package:provider/provider.dart';
 

lib/utils/stop_type_provider.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
 import 'package:provider/provider.dart';
 
 class StopTypeProvider extends StatefulWidget {

pubspec.yaml

@@ -19,6 +19,7 @@ dependencies:
   material_color_utilities: ^0.2.0
   permission_handler: 10.2.0
   provider: ^6.0.4
+  shared_preferences: 2.0.15
 
 dev_dependencies:
   google_fonts: ^3.0.1

test/photograpy_values_test.dart

@@ -1,7 +1,7 @@
-import 'package:lightmeter/models/aperture_value.dart';
+import 'package:lightmeter/data/models/aperture_value.dart';
-import 'package:lightmeter/models/iso_value.dart';
+import 'package:lightmeter/data/models/iso_value.dart';
-import 'package:lightmeter/models/photography_value.dart';
+import 'package:lightmeter/data/models/photography_value.dart';
-import 'package:lightmeter/models/shutter_speed_value.dart';
+import 'package:lightmeter/data/models/shutter_speed_value.dart';
 import 'package:test/test.dart';
 
 void main() {