Add first-load indicator and error handling

lib/clients/messaging_client.dart

@@ -62,10 +62,9 @@ class MessagingClient extends ChangeNotifier {
   int _attempts = 0;
   WebSocket? _wsChannel;
   bool _isConnecting = false;
-  String _initError = "";
-  bool _initDone = false;
+  String? _initStatus;
 
-  String get initError => _initError;
+  String? get initStatus => _initStatus;
 
   MessagingClient({required ApiClient apiClient, required NotificationClient notificationClient})
       : _apiClient = apiClient, _notificationClient = notificationClient {
@@ -86,14 +85,18 @@ class MessagingClient extends ChangeNotifier {
     _wsChannel!.add(jsonEncode(data)+eofChar);
   }
 
+  void resetStatus() {
+    _initStatus = null;
+    notifyListeners();
+  }
+
   void refreshFriendsListWithErrorHandler () async {
     try {
       await refreshFriendsList();
-      _initDone = true;
     } catch (e) {
-      _initError = "$e";
+      _initStatus = "$e";
+      notifyListeners();
     }
-    notifyListeners();
   }
 
   Future<void> refreshFriendsList() async {
@@ -121,7 +124,7 @@ class MessagingClient extends ChangeNotifier {
       aVal += a.userStatus.onlineStatus.compareTo(b.userStatus.onlineStatus) * 2;
       return aVal.compareTo(bVal);
     }));
-    _initError = "";
+    _initStatus = "";
     notifyListeners();
   }
 

lib/widgets/friends_list.dart

@@ -254,19 +254,24 @@ class _FriendsListState extends State<FriendsList> {
         ],
       ),
       body: Stack(
+        alignment: Alignment.topCenter,
         children: [
           Consumer<MessagingClient>(
               builder: (context, mClient, _) {
-                if (mClient.initError.isNotEmpty) {
+                if (mClient.initStatus == null) {
+                  return const LinearProgressIndicator();
+                } else if (mClient.initStatus!.isNotEmpty) {
                   return Column(
                     children: [
                       Expanded(
                           child: DefaultErrorWidget(
-                            message: mClient.initError,
+                            message: mClient.initStatus,
                             onRetry: () async {
+                              mClient.resetStatus();
                               mClient.refreshFriendsListWithErrorHandler();
                             },
-                          )),
+                          ),
+                      ),
                     ],
                   );
                 } else {

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.1+1
+version: 1.0.2+1
 
 environment:
   sdk: '>=2.19.6 <3.0.0'
@@ -52,6 +52,7 @@ dependencies:
   flutter_local_notifications: ^14.0.0+1
   collection: ^1.17.0
   package_info_plus: ^3.1.2
+  provider: ^6.0.5
 
 dev_dependencies:
   flutter_test: