deinitialize camera when on Settings screen

lib/application.dart

@@ -12,7 +12,9 @@ import 'package:lightmeter/utils/inherited_generics.dart';
 class Application extends StatelessWidget {
   final Environment env;
 
-  const Application(this.env, {super.key});
+  Application(this.env, {super.key});
+
+  final RouteObserver<ModalRoute> routeObserver = RouteObserver<ModalRoute>();
 
   @override
   Widget build(BuildContext context) {
@@ -30,15 +32,19 @@ class Application extends StatelessWidget {
                   GlobalCupertinoLocalizations.delegate,
                 ],
                 supportedLocales: S.delegate.supportedLocales,
-                builder: (context, child) => MediaQuery(
+                builder: (context, child) => InheritedWidgetBase<RouteObserver<ModalRoute>>(
-                  data: MediaQuery.of(context).copyWith(textScaleFactor: 1.0),
+                  data: routeObserver,
-                  child: child!,
+                  child: MediaQuery(
+                    data: MediaQuery.of(context).copyWith(textScaleFactor: 1.0),
+                    child: child!,
+                  ),
                 ),
                 initialRoute: "metering",
                 routes: {
                   "metering": (context) => const MeteringFlow(),
                   "settings": (context) => const SettingsFlow(),
                 },
+                navigatorObservers: [routeObserver],
               ),
             )
           : const SizedBox(),

lib/main_dev.dart

@@ -4,5 +4,5 @@ import 'package:lightmeter/environment.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  runApp(const Application(Environment.dev()));
+  runApp(Application(const Environment.dev()));
 }

lib/main_prod.dart

@@ -6,6 +6,5 @@ import 'package:lightmeter/firebase.dart';
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await initializeFirebase();
-
+  runApp(Application(const Environment.prod()));
-  runApp(const Application(Environment.prod()));
 }

lib/screens/metering/components/camera_container/widget_container_camera.dart

@@ -18,9 +18,10 @@ import 'package:lightmeter/screens/metering/components/camera_container/state_co
 import 'package:lightmeter/screens/metering/components/shared/exposure_pairs_list/widget_list_exposure_pairs.dart';
 import 'package:lightmeter/screens/metering/components/shared/metering_top_bar/widget_top_bar_metering.dart';
 import 'package:lightmeter/screens/metering/components/shared/readings_container/widget_container_readings.dart';
+import 'package:lightmeter/utils/inherited_generics.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
-class CameraContainer extends StatelessWidget {
+class CameraContainer extends StatefulWidget {
   final ExposurePair? fastest;
   final ExposurePair? slowest;
   final Film film;
@@ -44,6 +45,29 @@ class CameraContainer extends StatelessWidget {
     super.key,
   });
 
+  @override
+  State<CameraContainer> createState() => _CameraContainerState();
+}
+
+class _CameraContainerState extends State<CameraContainer> with RouteAware {
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    context.get<RouteObserver<ModalRoute>>().subscribe(this, ModalRoute.of(context)!);
+  }
+
+  @override
+  void didPushNext() {
+    super.didPushNext();
+    context.read<CameraContainerBloc>().add(const DeinitializeEvent());
+  }
+
+  @override
+  void didPopNext() {
+    super.didPopNext();
+    context.read<CameraContainerBloc>().add(const InitializeEvent());
+  }
+
   @override
   Widget build(BuildContext context) {
     final double cameraViewHeight =
@@ -75,14 +99,14 @@ class CameraContainer extends StatelessWidget {
       children: [
         MeteringTopBar(
           readingsContainer: ReadingsContainer(
-            fastest: fastest,
+            fastest: widget.fastest,
-            slowest: slowest,
+            slowest: widget.slowest,
-            film: film,
+            film: widget.film,
-            iso: iso,
+            iso: widget.iso,
-            nd: nd,
+            nd: widget.nd,
-            onFilmChanged: onFilmChanged,
+            onFilmChanged: widget.onFilmChanged,
-            onIsoChanged: onIsoChanged,
+            onIsoChanged: widget.onIsoChanged,
-            onNdChanged: onNdChanged,
+            onNdChanged: widget.onNdChanged,
           ),
           appendixHeight: topBarOverflow,
           preview: const _CameraViewBuilder(),
@@ -92,7 +116,7 @@ class CameraContainer extends StatelessWidget {
             padding: const EdgeInsets.symmetric(horizontal: Dimens.paddingM),
             child: _MiddleContentWrapper(
               topBarOverflow: topBarOverflow,
-              leftContent: ExposurePairsList(exposurePairs),
+              leftContent: ExposurePairsList(widget.exposurePairs),
               rightContent: const _CameraControlsBuilder(),
             ),
           ),

lib/screens/metering/components/light_sensor_container/bloc_container_light_sensor.dart

@@ -26,6 +26,7 @@ class LightSensorContainerBloc
           const LightSensorContainerState(null),
         ) {
     on<LuxMeteringEvent>(_onLuxMeteringEvent);
+    on<CancelLuxMeteringEvent>(_onCancelLuxMeteringEvent);
   }
 
   @override
@@ -51,6 +52,10 @@ class LightSensorContainerBloc
     communicationBloc.add(communication_event.MeteringInProgressEvent(ev100));
   }
 
+  void _onCancelLuxMeteringEvent(CancelLuxMeteringEvent event, _) {
+    _cancelMetering();
+  }
+
   void _startMetering() {
     _luxSubscriptions = _meteringInteractor.luxStream().listen((lux) => add(LuxMeteringEvent(lux)));
   }

lib/screens/metering/components/light_sensor_container/event_container_light_sensor.dart

@@ -7,3 +7,7 @@ class LuxMeteringEvent extends LightSensorContainerEvent {
 
   const LuxMeteringEvent(this.lux);
 }
+
+class CancelLuxMeteringEvent extends LightSensorContainerEvent {
+  const CancelLuxMeteringEvent();
+}

lib/screens/metering/components/light_sensor_container/widget_container_light_sensor.dart

@@ -1,13 +1,17 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:lightmeter/data/models/exposure_pair.dart';
 import 'package:lightmeter/data/models/film.dart';
 import 'package:lightmeter/res/dimens.dart';
+import 'package:lightmeter/screens/metering/components/light_sensor_container/bloc_container_light_sensor.dart';
+import 'package:lightmeter/screens/metering/components/light_sensor_container/event_container_light_sensor.dart';
 import 'package:lightmeter/screens/metering/components/shared/exposure_pairs_list/widget_list_exposure_pairs.dart';
 import 'package:lightmeter/screens/metering/components/shared/metering_top_bar/widget_top_bar_metering.dart';
 import 'package:lightmeter/screens/metering/components/shared/readings_container/widget_container_readings.dart';
+import 'package:lightmeter/utils/inherited_generics.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
-class LightSensorContainer extends StatelessWidget {
+class LightSensorContainer extends StatefulWidget {
   final ExposurePair? fastest;
   final ExposurePair? slowest;
   final Film film;
@@ -31,26 +35,43 @@ class LightSensorContainer extends StatelessWidget {
     super.key,
   });
 
+  @override
+  State<LightSensorContainer> createState() => _LightSensorContainerState();
+}
+
+class _LightSensorContainerState extends State<LightSensorContainer> with RouteAware {
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    context.get<RouteObserver<ModalRoute>>().subscribe(this, ModalRoute.of(context)!);
+  }
+
+  @override
+  void didPushNext() {
+    super.didPushNext();
+    context.read<LightSensorContainerBloc>().add(const CancelLuxMeteringEvent());
+  }
+
   @override
   Widget build(BuildContext context) {
     return Column(
       children: [
         MeteringTopBar(
           readingsContainer: ReadingsContainer(
-            fastest: fastest,
+            fastest: widget.fastest,
-            slowest: slowest,
+            slowest: widget.slowest,
-            film: film,
+            film: widget.film,
-            iso: iso,
+            iso: widget.iso,
-            nd: nd,
+            nd: widget.nd,
-            onFilmChanged: onFilmChanged,
+            onFilmChanged: widget.onFilmChanged,
-            onIsoChanged: onIsoChanged,
+            onIsoChanged: widget.onIsoChanged,
-            onNdChanged: onNdChanged,
+            onNdChanged: widget.onNdChanged,
           ),
         ),
         Expanded(
           child: Padding(
             padding: const EdgeInsets.symmetric(horizontal: Dimens.paddingM),
-            child: Center(child: ExposurePairsList(exposurePairs)),
+            child: Center(child: ExposurePairsList(widget.exposurePairs)),
           ),
         ),
       ],