Listen to WebSocket close events

lib/helpers/events_helper.dart

@@ -0,0 +1,32 @@
+import 'dart:async';
+
+import 'package:event_bus/event_bus.dart';
+
+/// Events helper
+///
+/// @author Pierre Hubert
+
+/// Main WebSocket closed
+class WSClosedEvent {}
+
+class EventsHelper {
+  static EventBus _mgr = EventBus();
+
+  /// Listen to event
+  ///
+  /// Do not use this method directly. You should instead prefer to use
+  /// [SafeState.listen] to handle safely widgets lifecycle...
+  ///
+  /// You can not register to global events
+  static StreamSubscription<T> on<T>(void onData(T event)) {
+    if (T == dynamic) throw Exception("Do not register to all events!");
+
+    final stream = _mgr.on<T>();
+    return stream.listen(onData);
+  }
+
+  /// Propagate an event
+  static void emit<T>(T event) {
+    _mgr.fire(event);
+  }
+}

lib/helpers/websocket_helper.dart

@@ -1,3 +1,4 @@
+import 'package:comunic/helpers/events_helper.dart';
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/config.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
@@ -28,7 +29,7 @@ class WebSocketHelper {
     // First, get an access token
     final token = await _getWsToken();
 
-    // Determine websocket URI
+    // Determine WebSocket URI
     final wsURL =
         "${(config().apiServerSecure ? "wss" : "ws")}://${config()
         .apiServerName}${config().apiServerUri}ws?token=$token";
@@ -48,7 +49,10 @@ class WebSocketHelper {
       },
 
       // Notify when the channel is closed
-      onDone: () => print("WS Channel closed"),
+      onDone: () {
+        print("WS Channel closed");
+        EventsHelper.emit(WSClosedEvent());
+      },
     );
   }
 }