feat(stream_chat_v1): implement foreground notifications

packages/stream_chat_v1/lib/channel_list.dart

@@ -145,6 +145,15 @@ class _ChannelList extends State<ChannelList> {
                   )
                 : ChannelsBloc(
                     child: ChannelListView(
+                      onChannelTap: (channel, _) {
+                        Navigator.pushNamed(
+                          context,
+                          Routes.CHANNEL_PAGE,
+                          arguments: ChannelPageArgs(
+                            channel: channel,
+                          ),
+                        );
+                      },
                       onStartChatPressed: () {
                         Navigator.pushNamed(context, Routes.NEW_CHAT);
                       },
@@ -154,7 +163,6 @@ class _ChannelList extends State<ChannelList> {
                       pagination: PaginationParams(
                         limit: 20,
                       ),
-                      channelWidget: ChannelPage(),
                       onViewInfoTap: (channel) {
                         Navigator.pop(context);
                         if (channel.memberCount == 2 && channel.isDistinct) {

packages/stream_chat_v1/lib/home_page.dart

@@ -1,9 +1,56 @@
+import 'dart:async';
+
+import 'package:example/channel_page.dart';
+import 'package:example/notifications_service.dart';
 import 'package:example/routes/app_routes.dart';
 import 'package:example/routes/routes.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
+class MyObserver extends NavigatorObserver {
+  Route? currentRoute;
+  late final StreamSubscription _subscription;
+
+  MyObserver(StreamChatClient client, BuildContext context) {
+    _subscription = client.on(EventType.messageNew).listen((event) {
+      final channelId = event.channelId;
+      if (currentRoute?.settings.name == Routes.CHANNEL_PAGE) {
+        final args = currentRoute?.settings.arguments as ChannelPageArgs;
+        if (args.channel?.id == channelId) {
+          return;
+        }
+      }
+
+      showLocalNotification(event, client.state.currentUser!.id, context);
+    });
+  }
+
+  @override
+  void didPop(Route route, Route? previousRoute) {
+    currentRoute = route;
+  }
+
+  @override
+  void didPush(Route route, Route? previousRoute) {
+    currentRoute = route;
+  }
+
+  @override
+  void didRemove(Route route, Route? previousRoute) {
+    currentRoute = route;
+  }
+
+  @override
+  void didReplace({Route? newRoute, Route? oldRoute}) {
+    currentRoute = newRoute;
+  }
+
+  void dispose() {
+    _subscription.cancel();
+  }
+}
+
 class HomePageArgs {
   final StreamChatClient chatClient;
 
@@ -24,6 +71,7 @@ class HomePage extends StatefulWidget {
 
 class _HomePageState extends State<HomePage> {
   final GlobalKey<NavigatorState> _navigatorKey = GlobalKey();
+  MyObserver? _observer;
 
   @override
   Widget build(BuildContext context) {
@@ -38,8 +86,16 @@ class _HomePageState extends State<HomePage> {
           key: _navigatorKey,
           onGenerateRoute: AppRoutes.generateRoute,
           initialRoute: Routes.CHANNEL_LIST_PAGE,
+          observers: [_observer!],
         ),
       ),
     );
   }
+
+  @override
+  void didChangeDependencies() {
+    _observer?.dispose();
+    _observer = MyObserver(widget.chatClient, context);
+    super.didChangeDependencies();
+  }
 }

packages/stream_chat_v1/lib/routes/app_routes.dart

@@ -21,13 +21,13 @@ class AppRoutes {
     switch (settings.name) {
       case Routes.APP:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.APP),
+            settings: RouteSettings(arguments: args, name: Routes.APP),
             builder: (_) {
               return MyApp();
             });
       case Routes.HOME:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.HOME),
+            settings: RouteSettings(arguments: args, name: Routes.HOME),
             builder: (_) {
               final homePageArgs = args as HomePageArgs;
               return HomePage(
@@ -36,18 +36,19 @@ class AppRoutes {
             });
       case Routes.CHOOSE_USER:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.CHOOSE_USER),
+            settings: RouteSettings(arguments: args, name: Routes.CHOOSE_USER),
             builder: (_) {
               return ChooseUserPage();
             });
       case Routes.ADVANCED_OPTIONS:
         return MaterialPageRoute(
-          settings: const RouteSettings(name: Routes.ADVANCED_OPTIONS),
+          settings:
+              RouteSettings(arguments: args, name: Routes.ADVANCED_OPTIONS),
           builder: (_) => AdvancedOptionsPage(),
         );
       case Routes.CHANNEL_PAGE:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.CHANNEL_PAGE),
+            settings: RouteSettings(arguments: args, name: Routes.CHANNEL_PAGE),
             builder: (_) {
               final channelPageArgs = args as ChannelPageArgs;
               return StreamChannel(
@@ -61,19 +62,21 @@ class AppRoutes {
             });
       case Routes.NEW_CHAT:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.NEW_CHAT),
+            settings: RouteSettings(arguments: args, name: Routes.NEW_CHAT),
             builder: (_) {
               return NewChatScreen();
             });
       case Routes.NEW_GROUP_CHAT:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.NEW_GROUP_CHAT),
+            settings:
+                RouteSettings(arguments: args, name: Routes.NEW_GROUP_CHAT),
             builder: (_) {
               return NewGroupChatScreen();
             });
       case Routes.NEW_GROUP_CHAT_DETAILS:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.NEW_GROUP_CHAT_DETAILS),
+            settings: RouteSettings(
+                arguments: args, name: Routes.NEW_GROUP_CHAT_DETAILS),
             builder: (_) {
               return GroupChatDetailsScreen(
                 selectedUsers: args as List<User>?,
@@ -81,7 +84,8 @@ class AppRoutes {
             });
       case Routes.CHAT_INFO_SCREEN:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.CHAT_INFO_SCREEN),
+            settings:
+                RouteSettings(arguments: args, name: Routes.CHAT_INFO_SCREEN),
             builder: (context) {
               return ChatInfoScreen(
                 user: args as User?,
@@ -90,7 +94,8 @@ class AppRoutes {
             });
       case Routes.GROUP_INFO_SCREEN:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.GROUP_INFO_SCREEN),
+            settings:
+                RouteSettings(arguments: args, name: Routes.GROUP_INFO_SCREEN),
             builder: (context) {
               return GroupInfoScreen(
                 messageTheme: StreamChatTheme.of(context).ownMessageTheme,
@@ -98,7 +103,8 @@ class AppRoutes {
             });
       case Routes.CHANNEL_LIST_PAGE:
         return MaterialPageRoute(
-            settings: const RouteSettings(name: Routes.CHANNEL_LIST_PAGE),
+            settings:
+                RouteSettings(arguments: args, name: Routes.CHANNEL_LIST_PAGE),
             builder: (context) {
               return ChannelListPage();
             });