added focal length section

integration_test/e2e_test.dart

@@ -305,7 +305,8 @@ Future<void> _expectMeteringState(
   await tester.scrollToTheLastExposurePair(equipmentProfile: equipmentProfile);
   expectExposurePairsListItem(tester, slowest.split(' - ')[0], slowest.split(' - ')[1]);
   expectMeasureButton(ev);
-  expect(find.text(equipmentProfile.lensZoom.toZoom()), findsOneWidget);
+  final BuildContext context = tester.element(find.byType(IsoValuePicker));
+  expect(find.text(equipmentProfile.lensZoom.toZoom(context)), findsOneWidget);
 }
 
 Future<void> _expectMeteringStateAndMeasure(

lib/l10n/intl_en.arb

@@ -45,6 +45,8 @@
     "cameraFeatureSpotMeteringHint": "Long press the camera view to remove metering spot",
     "cameraFeatureHistogram": "Histogram",
     "cameraFeatureHistogramHint": "Enabling histogram can encrease battery drain",
+    "cameraFeaturesShowFocalLength": "Show Focal Length",
+    "cameraFeaturesShowFocalLengthHint": "Focal length will be determined after the first photo is taken",
     "film": "Film",
     "filmPush": "Film (push)",
     "filmPull": "Film (pull)",

lib/l10n/intl_fr.arb

@@ -45,6 +45,8 @@
     "cameraFeatureSpotMeteringHint": "Appuyez longuement sur la vue de l'appareil photo pour supprimer le spot de mesure",
     "cameraFeatureHistogram": "Histogramme",
     "cameraFeatureHistogramHint": "L'activation de l'histogramme peut augmenter la consommation de la batterie",
+    "cameraFeaturesShowFocalLength": "Afficher la focale",
+    "cameraFeaturesShowFocalLengthHint": "La focale sera déterminée après la première photo",
     "film": "Pellicule",
     "filmPush": "Pellicule (push)",
     "filmPull": "Pellicule (pull)",

lib/l10n/intl_ru.arb

@@ -45,6 +45,8 @@
     "cameraFeatureSpotMeteringHint": "Используйте долгое нажатие, чтобы удалить точку замера",
     "cameraFeatureHistogram": "Гистограмма",
     "cameraFeatureHistogramHint": "Использование гистограммы может увеличить расход аккумулятора",
+    "cameraFeaturesShowFocalLength": "Показать фокусное расстояние",
+    "cameraFeaturesShowFocalLengthHint": "Фокусное расстояние будет определено после первого снимка",
     "film": "Пленка",
     "filmPush": "Пленка (push)",
     "filmPull": "Пленка (pull)",

lib/l10n/intl_zh.arb

@@ -45,6 +45,8 @@
     "cameraFeatureSpotMeteringHint": "长按相机视图可移除测光点",
     "cameraFeatureHistogram": "直方图",
     "cameraFeatureHistogramHint": "启用直方图会增加电池消耗",
+    "cameraFeaturesShowFocalLength": "显示焦距",
+    "cameraFeaturesShowFocalLengthHint": "焦距将在拍摄第一张照片后确定",
     "film": "胶片",
     "filmPush": "胶片 (push)",
     "filmPull": "胶片 (pull)",
@@ -150,4 +152,4 @@
     "filmFormulaExponentialRfPlaceholder": "1.3",
     "addEquipmentProfileTitle": "添加设备",
     "editEquipmentProfileTitle": "编辑设备"
-}
+}

lib/screens/equipment_profile_edit/screen_equipment_profile_edit.dart

@@ -246,7 +246,7 @@ class _LensZoomListTileBuilder extends StatelessWidget {
         description: S.of(context).lensZoomDescription,
         value: state.lensZoom,
         range: const RangeValues(1, 7),
-        valueAdapter: (_, value) => value.toZoom(),
+        valueAdapter: (context, value) => value.toZoom(context),
         onChanged: (value) {
           context.read<EquipmentProfileEditBloc>().add(EquipmentProfileLensZoomChangedEvent(value));
         },

lib/screens/metering/components/camera_container/components/camera_controls/components/zoom_slider/widget_slider_zoom.dart

@@ -35,7 +35,7 @@ class _ZoomSliderState extends State<ZoomSlider> {
       icon: Icons.search_outlined,
       defaultValue: EquipmentProfiles.selectedOf(context).lensZoom,
       rulerValueAdapter: (value) => value.toStringAsFixed(0),
-      valueAdapter: (value) => value.toZoom(),
+      valueAdapter: (value) => value.toZoom(context),
     );
   }
 }

lib/screens/settings/components/metering/components/camera_features/widget_list_tile_camera_features.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:lightmeter/data/models/camera_feature.dart';
 import 'package:lightmeter/generated/l10n.dart';
+import 'package:lightmeter/providers/services_provider.dart';
 import 'package:lightmeter/providers/user_preferences_provider.dart';
 import 'package:lightmeter/screens/settings/components/shared/dialog_switch/widget_dialog_switch.dart';
 import 'package:lightmeter/screens/settings/components/shared/iap_list_tile/widget_list_tile_iap.dart';
@@ -20,21 +21,21 @@ class CameraFeaturesListTile extends StatelessWidget {
             icon: Icons.camera_alt_outlined,
             title: S.of(context).cameraFeatures,
             values: UserPreferencesProvider.cameraConfigOf(context),
-            titleAdapter: (context, feature) {
-              switch (feature) {
-                case CameraFeature.spotMetering:
-                  return S.of(context).cameraFeatureSpotMetering;
-                case CameraFeature.histogram:
-                  return S.of(context).cameraFeatureHistogram;
-              }
+            enabledAdapter: (feature) => switch (feature) {
+              CameraFeature.spotMetering => true,
+              CameraFeature.histogram => true,
+              CameraFeature.showFocalLength =>
+                ServicesProvider.of(context).userPreferencesService.cameraFocalLength != null,
             },
-            subtitleAdapter: (context, feature) {
-              switch (feature) {
-                case CameraFeature.spotMetering:
-                  return S.of(context).cameraFeatureSpotMeteringHint;
-                case CameraFeature.histogram:
-                  return S.of(context).cameraFeatureHistogramHint;
-              }
+            titleAdapter: (context, feature) => switch (feature) {
+              CameraFeature.spotMetering => S.of(context).cameraFeatureSpotMetering,
+              CameraFeature.histogram => S.of(context).cameraFeatureHistogram,
+              CameraFeature.showFocalLength => S.of(context).cameraFeaturesShowFocalLength,
+            },
+            subtitleAdapter: (context, feature) => switch (feature) {
+              CameraFeature.spotMetering => S.of(context).cameraFeatureSpotMeteringHint,
+              CameraFeature.histogram => S.of(context).cameraFeatureHistogramHint,
+              CameraFeature.showFocalLength => S.of(context).cameraFeaturesShowFocalLengthHint,
             },
             onSave: UserPreferencesProvider.of(context).setCameraFeature,
           ),

lib/utils/double_to_zoom.dart

@@ -1,3 +1,19 @@
+import 'package:flutter/material.dart';
+import 'package:lightmeter/data/models/camera_feature.dart';
+import 'package:lightmeter/providers/services_provider.dart';
+import 'package:lightmeter/providers/user_preferences_provider.dart';
+
 extension DoubleToZoom on double {
-  String toZoom() => 'x${toStringAsFixed(2)}';
+  String toZoom(BuildContext context) {
+    final showFocalLength = UserPreferencesProvider.cameraFeatureOf(context, CameraFeature.showFocalLength);
+    final cameraFocalLength = ServicesProvider.of(context).userPreferencesService.cameraFocalLength;
+
+    if (showFocalLength && cameraFocalLength != null) {
+      ServicesProvider.of(context).userPreferencesService.cameraFocalLength;
+      final zoomedFocalLength = (this * cameraFocalLength).round();
+      return '${zoomedFocalLength}mm';
+    } else {
+      return 'x${toStringAsFixed(2)}';
+    }
+  }
 }