show message when there is error in submit or remove approvals

lib/core/network/app_exceptions.dart

@@ -21,7 +21,7 @@ class FetchDataException extends AppException {
   FetchDataException([String? message, int? statusCode, originalError])
     : super(
         message ?? 'Error During Communication: ',
-        'Network Error',
+        'Network Error : ',
         statusCode,
         originalError,
       );

lib/view_models/liked_tenders_view_model.dart

@@ -55,6 +55,11 @@ class LikedTendersViewModel with ChangeNotifier {
     _homeViewModel.init();
   }
 
+  void clearApprovalErrorMessage() {
+    _errorMessage = null;
+    notifyListeners();
+  }
+
   Future<void> getLikedTenders({bool reset = false}) async {
     if (!reset && (isLoadingMore || !hasMore)) {
       return;
@@ -303,7 +308,7 @@ class LikedTendersViewModel with ChangeNotifier {
         approvalStatus = false;
         break;
     }
-
+    approvalStatus = false;
     _isSubmitApprovalLoading = false;
     notifyListeners();
   }
@@ -370,6 +375,7 @@ class LikedTendersViewModel with ChangeNotifier {
         break;
     }
 
+    approvalStatus = false;
     _isRejectApprovalLoading = false;
     notifyListeners();
   }

lib/views/liked_tenders/pages/liked_tenders_desktop_page.dart

@@ -24,9 +24,26 @@ class _LikedTendersDesktopPageState extends State<LikedTendersDesktopPage> {
   @override
   void initState() {
     viewModel = context.read<LikedTendersViewModel>();
+    viewModel.addListener(_viewModelListener);
     super.initState();
   }
 
+  void _viewModelListener() {
+    if (viewModel.approvalErrorMessage?.isNotEmpty == true &&
+        viewModel.approvalStatus == false) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(viewModel.approvalErrorMessage!)));
+      viewModel.clearApprovalErrorMessage();
+    }
+  }
+
+  @override
+  void dispose() {
+    viewModel.removeListener(_viewModelListener);
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return PopScope(

lib/views/liked_tenders/pages/liked_tenders_mobile_page.dart

@@ -27,6 +27,18 @@ class _LikedTendersMobilePageState extends State<LikedTendersMobilePage> {
     viewModel = context.read<LikedTendersViewModel>();
     super.initState();
     _scrollController = ScrollController()..addListener(_onScroll);
+    viewModel.addListener(_viewModelListener);
+  }
+
+  void _viewModelListener() {
+    if (mounted &&
+        viewModel.approvalErrorMessage?.isNotEmpty == true &&
+        viewModel.approvalStatus == false) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(viewModel.approvalErrorMessage!)));
+      viewModel.clearApprovalErrorMessage();
+    }
   }
 
   void _onScroll() {
@@ -46,6 +58,7 @@ class _LikedTendersMobilePageState extends State<LikedTendersMobilePage> {
   void dispose() {
     _scrollController.removeListener(_onScroll);
     _scrollController.dispose();
+    viewModel.removeListener(_viewModelListener);
     super.dispose();
   }
 
@@ -94,11 +107,7 @@ class _LikedTendersMobilePageState extends State<LikedTendersMobilePage> {
                   final itemCount =
                       feedback.length + (viewModel.isLoadingMore ? 1 : 0);
 
-                  return RefreshIndicator(
+                  return ListView.builder(
-                    onRefresh: () async {
-                      await viewModel.getLikedTenders(reset: true);
-                    },
-                    child: ListView.builder(
                     controller: _scrollController,
                     padding: EdgeInsets.symmetric(
                       horizontal: 24.0.w(),
@@ -109,8 +118,9 @@ class _LikedTendersMobilePageState extends State<LikedTendersMobilePage> {
                       if (index < feedback.length) {
                         final item = feedback[index];
                         TenderApprovalsData? approval;
-                          bool hasApproval = viewModel
+                        bool hasApproval = viewModel.hasTenderApprovalForTender(
-                              .hasTenderApprovalForTender(item.tenderId!);
+                          item.tenderId!,
+                        );
                         if (hasApproval) {
                           approval = viewModel.getApprovalStatusForTender(
                             item.tenderId!,
@@ -162,7 +172,6 @@ class _LikedTendersMobilePageState extends State<LikedTendersMobilePage> {
                         );
                       }
                     },
-                    ),
                   );
                 },
               ),

lib/views/liked_tenders/pages/liked_tenders_tablet_page.dart

@@ -26,6 +26,23 @@ class _LikedTendersTabletPageState extends State<LikedTendersTabletPage> {
   void initState() {
     viewModel = context.read<LikedTendersViewModel>();
     super.initState();
+    viewModel.addListener(_viewModelListener);
+  }
+
+  void _viewModelListener() {
+    if (viewModel.approvalErrorMessage?.isNotEmpty == true &&
+        viewModel.approvalStatus == false) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(viewModel.approvalErrorMessage!)));
+      viewModel.clearApprovalErrorMessage();
+    }
+  }
+
+  @override
+  void dispose() {
+    viewModel.removeListener(_viewModelListener);
+    super.dispose();
   }
 
   @override