Added camera and exposurepairs list placeholders

lib/l10n/intl_en.arb

@@ -17,6 +17,7 @@
     "filmSpeed": "Film speed",
     "nd": "ND",
     "ndFilterFactor": "Neutral density filter factor",
+    "noExposurePairs": "There are no exposure pairs for the selected settings.",
     "none": "None",
     "cancel": "Cancel",
     "select": "Select",

lib/providers/theme_provider.dart

@@ -224,16 +224,18 @@ class _ThemeDataProvider extends StatelessWidget {
 
     return ColorScheme(
       brightness: brightness,
+      background: Color(scheme.background),
+      error: Color(scheme.error),
+      errorContainer: Color(scheme.errorContainer),
+      onBackground: Color(scheme.onBackground),
+      onError: Color(scheme.onError),
+      onErrorContainer: Color(scheme.onErrorContainer),
       primary: Color(scheme.primary),
       onPrimary: Color(scheme.onPrimary),
       primaryContainer: Color(scheme.primaryContainer),
       onPrimaryContainer: Color(scheme.onPrimaryContainer),
       secondary: Color(scheme.secondary),
       onSecondary: Color(scheme.onSecondary),
-      error: Color(scheme.error),
-      onError: Color(scheme.onError),
-      background: Color(scheme.background),
-      onBackground: Color(scheme.onBackground),
       surface: Color.alphaBlend(
         Color(scheme.primary).withOpacity(0.05),
         Color(scheme.background),
@@ -244,6 +246,8 @@ class _ThemeDataProvider extends StatelessWidget {
         Color(scheme.background),
       ),
       onSurfaceVariant: Color(scheme.onSurfaceVariant),
+      outline: Color(scheme.outline),
+      outlineVariant: Color(scheme.outlineVariant),
     );
   }
 }

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

@@ -46,9 +46,7 @@ class MeteringBottomControls extends StatelessWidget {
                   )
                 else
                   const Spacer(),
-                MeteringMeasureButton(
+                MeteringMeasureButton(onTap: onMeasure),
-                  onTap: onMeasure,
-                ),
                 Expanded(
                   child: Center(
                     child: IconButton(

lib/screens/metering/components/camera_container/components/camera_view_placeholder/widget_placeholder_camera_view.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+import 'package:lightmeter/res/dimens.dart';
+
+class CameraViewPlaceholder extends StatelessWidget {
+  const CameraViewPlaceholder({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(Dimens.borderRadiusM)),
+      child: const Center(child: Icon(Icons.no_photography)),
+    );
+  }
+}

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

@@ -12,6 +12,7 @@ import 'package:lightmeter/screens/metering/components/shared/readings_container
 
 import 'bloc_container_camera.dart';
 import 'components/camera_controls/widget_camera_controls.dart';
+import 'components/camera_view_placeholder/widget_placeholder_camera_view.dart';
 import 'event_container_camera.dart';
 import 'state_container_camera.dart';
 
@@ -76,13 +77,11 @@ class _CameraViewBuilder extends StatelessWidget {
   Widget build(BuildContext context) {
     return AspectRatio(
       aspectRatio: PlatformConfig.cameraPreviewAspectRatio,
-      child: Center(
+      child: BlocBuilder<CameraContainerBloc, CameraContainerState>(
-        child: BlocBuilder<CameraContainerBloc, CameraContainerState>(
+        buildWhen: (previous, current) => current is CameraInitializedState,
-          buildWhen: (previous, current) => current is CameraInitializedState,
+        builder: (context, state) => state is CameraInitializedState
-          builder: (context, state) => state is CameraInitializedState
+            ? Center(child: CameraView(controller: state.controller))
-              ? CameraView(controller: state.controller)
+            : const CameraViewPlaceholder(),
-              : const ColoredBox(color: Colors.black),
-        ),
       ),
     );
   }

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

@@ -44,7 +44,7 @@ class LightSensorContainer extends StatelessWidget {
         Expanded(
           child: Padding(
             padding: const EdgeInsets.symmetric(horizontal: Dimens.paddingM),
-            child: ExposurePairsList(exposurePairs),
+            child: Center(child: ExposurePairsList(exposurePairs)),
           ),
         ),
       ],

lib/screens/metering/components/shared/exposure_pairs_list/components/empty_exposure_pairs_list/widget_list_exposure_pairs_empty.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:lightmeter/generated/l10n.dart';
+import 'package:lightmeter/res/dimens.dart';
+
+class EmptyExposurePairsList extends StatelessWidget {
+  const EmptyExposurePairsList({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ConstrainedBox(
+      constraints: BoxConstraints(maxWidth: MediaQuery.of(context).size.width / 2),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(
+            Icons.not_interested,
+            color: Theme.of(context).colorScheme.onBackground,
+          ),
+          const SizedBox(height: Dimens.grid8),
+          Text(
+            S.of(context).noExposurePairs,
+            style: Theme.of(context)
+                .textTheme
+                .bodyMedium
+                ?.copyWith(color: Theme.of(context).colorScheme.onBackground),
+            textAlign: TextAlign.center,
+          ),
+        ],
+      ),
+    );
+  }
+}

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

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:lightmeter/data/models/exposure_pair.dart';
 import 'package:lightmeter/res/dimens.dart';
 
+import 'components/empty_exposure_pairs_list/widget_list_exposure_pairs_empty.dart';
 import 'components/exposure_pairs_list_item/widget_item_list_exposure_pairs.dart';
 
 class ExposurePairsList extends StatelessWidget {
@@ -11,6 +12,9 @@ class ExposurePairsList extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    if (exposurePairs.isEmpty) {
+      return const EmptyExposurePairsList();
+    }
     return Stack(
       alignment: Alignment.center,
       children: [