integrated EV value to measure button

lib/environment.dart

@@ -1,4 +1,7 @@
+enum BuildType { dev, prod }
+
 class Environment {
+  final BuildType buildType;
   final String sourceCodeUrl;
   final String issuesReportUrl;
   final String contactEmail;
@@ -6,6 +9,7 @@ class Environment {
   final bool hasLightSensor;
 
   const Environment({
+    required this.buildType,
     required this.sourceCodeUrl,
     required this.issuesReportUrl,
     required this.contactEmail,
@@ -13,18 +17,21 @@ class Environment {
   });
 
   const Environment.dev()
-      : sourceCodeUrl = 'https://github.com/vodemn/m3_lightmeter',
+      : buildType = BuildType.dev,
+        sourceCodeUrl = 'https://github.com/vodemn/m3_lightmeter',
         issuesReportUrl = 'https://github.com/vodemn/m3_lightmeter/issues',
         contactEmail = 'contact.vodemn@gmail.com',
         hasLightSensor = false;
 
   const Environment.prod()
-      : sourceCodeUrl = 'https://github.com/vodemn/m3_lightmeter',
+      : buildType = BuildType.prod,
+        sourceCodeUrl = 'https://github.com/vodemn/m3_lightmeter',
         issuesReportUrl = 'https://github.com/vodemn/m3_lightmeter/issues',
         contactEmail = 'contact.vodemn@gmail.com',
         hasLightSensor = false;
 
   Environment copyWith({bool? hasLightSensor}) => Environment(
+        buildType: buildType,
         sourceCodeUrl: sourceCodeUrl,
         issuesReportUrl: issuesReportUrl,
         contactEmail: contactEmail,

lib/l10n/intl_en.arb

@@ -2,8 +2,9 @@
     "@@locale": "en",
     "fastestExposurePair": "Fastest",
     "slowestExposurePair": "Slowest",
-    "ev": "{value} EV",
+    "ev": "EV",
-    "@ev": {
+    "evValue": "{value} EV",
+    "@evValue": {
         "placeholders": {
             "value": {
                 "type": "String"

lib/l10n/intl_fr.arb

@@ -2,8 +2,9 @@
     "@@locale": "fr",
     "fastestExposurePair": "Le plus rapide",
     "slowestExposurePair": "Le plus lent",
-    "ev": "{value} EV",
+    "ev": "EV",
-    "@ev": {
+    "evValue": "{value} EV",
+    "@evValue": {
         "placeholders": {
             "value": {
                 "type": "String"

lib/l10n/intl_ru.arb

@@ -2,8 +2,9 @@
     "@@locale": "ru",
     "fastestExposurePair": "Короткая выдержка",
     "slowestExposurePair": "Длинная выдержка",
-    "ev": "{value} EV",
+    "ev": "EV",
-    "@ev": {
+    "evValue": "{value} EV",
+    "@evValue": {
         "placeholders": {
             "value": {
                 "type": "String"

lib/screens/metering/components/bottom_controls/components/measure_button/widget_button_measure.dart

@@ -1,13 +1,16 @@
 import 'package:flutter/material.dart';
+import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/res/dimens.dart';
 import 'package:lightmeter/screens/shared/filled_circle/widget_circle_filled.dart';
 
 class MeteringMeasureButton extends StatefulWidget {
+  final double? ev;
   final double size;
   final VoidCallback onTap;
 
   const MeteringMeasureButton({
     required this.onTap,
+    required this.ev,
     this.size = 72,
     super.key,
   });
@@ -55,6 +58,16 @@ class _MeteringMeasureButtonState extends State<MeteringMeasureButton> {
               child: FilledCircle(
                 color: Theme.of(context).colorScheme.onSurface,
                 size: widget.size - Dimens.grid16,
+                child: Center(
+                  child: widget.ev != null
+                      ? Text(
+                          '${widget.ev!.toStringAsFixed(1)}\n${S.of(context).ev}',
+                          style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                                color: Theme.of(context).colorScheme.surface,
+                              ),
+                        )
+                      : null,
+                ),
               ),
             ),
           ),

lib/screens/metering/components/bottom_controls/provider_bottom_controls.dart

@@ -4,11 +4,13 @@ import 'package:lightmeter/res/dimens.dart';
 import 'widget_bottom_controls.dart';
 
 class MeteringBottomControlsProvider extends StatelessWidget {
+  final double? ev;
   final VoidCallback? onSwitchEvSourceType;
   final VoidCallback onMeasure;
   final VoidCallback onSettings;
 
   const MeteringBottomControlsProvider({
+    required this.ev,
     required this.onSwitchEvSourceType,
     required this.onMeasure,
     required this.onSettings,
@@ -30,6 +32,7 @@ class MeteringBottomControlsProvider extends StatelessWidget {
         ),
       ),
       child: MeteringBottomControls(
+        ev: ev,
         onSwitchEvSourceType: onSwitchEvSourceType,
         onMeasure: onMeasure,
         onSettings: onSettings,

lib/screens/metering/components/bottom_controls/widget_bottom_controls.dart

@@ -6,11 +6,13 @@ import 'package:provider/provider.dart';
 import 'components/measure_button/widget_button_measure.dart';
 
 class MeteringBottomControls extends StatelessWidget {
+  final double? ev;
   final VoidCallback? onSwitchEvSourceType;
   final VoidCallback onMeasure;
   final VoidCallback onSettings;
 
   const MeteringBottomControls({
+    required this.ev,
     required this.onSwitchEvSourceType,
     required this.onMeasure,
     required this.onSettings,
@@ -46,7 +48,10 @@ class MeteringBottomControls extends StatelessWidget {
                   )
                 else
                   const Spacer(),
-                MeteringMeasureButton(onTap: onMeasure),
+                MeteringMeasureButton(
+                  ev: ev,
+                  onTap: onMeasure,
+                ),
                 Expanded(
                   child: Center(
                     child: IconButton(

lib/screens/metering/components/shared/readings_container/components/animated_dialog_picker/components/photography_value_picker_dialog/widget_dialog_picker_photography_value.dart

@@ -83,9 +83,8 @@ class _PhotographyValuePickerDialogState<T extends PhotographyValue>
                 child: widget.itemTitleBuilder(context, widget.values[index]),
               ),
               secondary: widget.values[index].value != _selectedValue.value
-                  ? Text(S
+                  ? Text(S.of(context).evValue(
-                      .of(context)
+                      widget.evDifferenceBuilder.call(_selectedValue, widget.values[index])))
-                      .ev(widget.evDifferenceBuilder.call(_selectedValue, widget.values[index])))
                   : null,
               onChanged: (value) {
                 if (value != null) {

lib/screens/metering/screen_metering.dart

@@ -57,13 +57,17 @@ class _MeteringScreenState extends State<MeteringScreen> {
                     ),
             ),
           ),
-          MeteringBottomControlsProvider(
+          BlocBuilder<MeteringBloc, MeteringState>(
+            buildWhen: (previous, current) => previous.ev != current.ev,
+            builder: (context, state) => MeteringBottomControlsProvider(
+              ev: context.read<Environment>().buildType == BuildType.dev ? state.ev : null,
               onSwitchEvSourceType: context.read<Environment>().hasLightSensor
                   ? EvSourceTypeProvider.of(context).toggleType
                   : null,
               onMeasure: () => _bloc.add(const MeasureEvent()),
               onSettings: () => Navigator.pushNamed(context, 'settings'),
             ),
+          ),
         ],
       ),
     );

lib/screens/settings/components/calibration/components/calibration_dialog/widget_dialog_calibration.dart

@@ -101,7 +101,7 @@ class _CalibrationUnit extends StatelessWidget {
         ListTile(
           contentPadding: EdgeInsets.zero,
           title: Text(title),
-          trailing: Text(S.of(context).ev(value.toStringSignedAsFixed(1))),
+          trailing: Text(S.of(context).evValue(value.toStringSignedAsFixed(1))),
         ),
         Row(
           mainAxisSize: MainAxisSize.min,