added loading indicators to charts.

lib/pages/analytics/modules/energy_management/blocs/total_energy_consumption/total_energy_consumption_bloc.dart

@@ -22,8 +22,8 @@ class TotalEnergyConsumptionBloc
     TotalEnergyConsumptionLoadEvent event,
     Emitter<TotalEnergyConsumptionState> emit,
   ) async {
-    emit(state.copyWith(status: TotalEnergyConsumptionStatus.loading));
     try {
+      emit(state.copyWith(status: TotalEnergyConsumptionStatus.loading));
       final chartData = await _totalEnergyConsumptionService.load(event.param);
       emit(
         state.copyWith(

lib/pages/analytics/modules/energy_management/widgets/energy_consumption_by_phases_chart_box.dart

@@ -22,7 +22,7 @@ class EnergyConsumptionByPhasesChartBox extends StatelessWidget {
             spacing: 20,
             children: [
               AnalyticsErrorWidget(state.errorMessage),
-              const EnergyConsumptionByPhasesTitle(),
+              EnergyConsumptionByPhasesTitle(isLoading: state.status == EnergyConsumptionByPhasesStatus.loading,),
               Expanded(
                 child: EnergyConsumptionByPhasesChart(
                   energyData: state.chartData,

lib/pages/analytics/modules/energy_management/widgets/energy_consumption_by_phases_title.dart

@@ -1,10 +1,12 @@
 import 'package:flutter/material.dart';
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/chart_title.dart';
+import 'package:syncrow_web/pages/analytics/widgets/charts_loading_widget.dart';
 import 'package:syncrow_web/utils/color_manager.dart';
 import 'package:syncrow_web/utils/extension/build_context_x.dart';
 
 class EnergyConsumptionByPhasesTitle extends StatelessWidget {
-  const EnergyConsumptionByPhasesTitle({super.key});
+  const EnergyConsumptionByPhasesTitle({super.key, required this.isLoading});
+  final bool isLoading;
 
   @override
   Widget build(BuildContext context) {
@@ -12,6 +14,7 @@ class EnergyConsumptionByPhasesTitle extends StatelessWidget {
       crossAxisAlignment: CrossAxisAlignment.center,
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
+        ChartsLoadingWidget(isLoading: isLoading),
         Expanded(
           flex: 4,
           child: FittedBox(

lib/pages/analytics/modules/energy_management/widgets/energy_consumption_per_device_chart_box.dart

@@ -5,6 +5,7 @@ import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/ch
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/energy_consumption_per_device_chart.dart';
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/energy_consumption_per_device_devices_list.dart';
 import 'package:syncrow_web/pages/analytics/widgets/analytics_error_widget.dart';
+import 'package:syncrow_web/pages/analytics/widgets/charts_loading_widget.dart';
 import 'package:syncrow_web/utils/style.dart';
 
 class EnergyConsumptionPerDeviceChartBox extends StatelessWidget {
@@ -28,6 +29,8 @@ class EnergyConsumptionPerDeviceChartBox extends StatelessWidget {
               Row(
                 spacing: 32,
                 children: [
+                  if (state.status == EnergyConsumptionPerDeviceStatus.loading)
+                    const ChartsLoadingWidget(isLoading: true),
                   const Expanded(
                     flex: 3,
                     child: FittedBox(

lib/pages/analytics/modules/energy_management/widgets/total_energy_consumption_chart_box.dart

@@ -4,6 +4,7 @@ import 'package:syncrow_web/pages/analytics/modules/energy_management/blocs/tota
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/chart_title.dart';
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/total_energy_consumption_chart.dart';
 import 'package:syncrow_web/pages/analytics/widgets/analytics_error_widget.dart';
+import 'package:syncrow_web/pages/analytics/widgets/charts_loading_widget.dart';
 import 'package:syncrow_web/utils/style.dart';
 
 class TotalEnergyConsumptionChartBox extends StatelessWidget {
@@ -22,9 +23,12 @@ class TotalEnergyConsumptionChartBox extends StatelessWidget {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             AnalyticsErrorWidget(state.errorMessage),
-            const Row(
+            Row(
               children: [
-                Expanded(
+                ChartsLoadingWidget(
+                  isLoading: state.status == TotalEnergyConsumptionStatus.loading,
+                ),
+                const Expanded(
                   flex: 3,
                   child: FittedBox(
                     alignment: AlignmentDirectional.centerStart,
@@ -32,7 +36,7 @@ class TotalEnergyConsumptionChartBox extends StatelessWidget {
                     child: ChartTitle(title: Text('Total Energy Consumption')),
                   ),
                 ),
-                Spacer(flex: 4),
+                const Spacer(flex: 4),
               ],
             ),
             const Divider(),

lib/pages/analytics/widgets/charts_loading_widget.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+class ChartsLoadingWidget extends StatelessWidget {
+  const ChartsLoadingWidget({
+    required this.isLoading,
+    super.key,
+  });
+  final bool isLoading;
+
+  @override
+  Widget build(BuildContext context) {
+    return Visibility(
+      visible: isLoading,
+      child: const SizedBox.square(
+        dimension: 16,
+        child: FittedBox(
+          child: CircularProgressIndicator(
+            padding: EdgeInsetsDirectional.only(end: 8),
+          ),
+        ),
+      ),
+    );
+  }
+}