✨ Focused realm linked with feed stream

lib/controllers/post_list_controller.dart

@@ -9,6 +9,7 @@ import 'package:solian/providers/last_read.dart';
 
 class PostListController extends GetxController {
   String? author;
+  String? realm;
 
   /// The polling source modifier.
   /// - `0`: default recommendations
@@ -99,8 +100,10 @@ class PostListController extends GetxController {
     final idx = <dynamic>{};
     postList.retainWhere((x) => idx.add(x.id));
 
+    if (postList.isNotEmpty) {
       var lastId = postList.map((x) => x.id).reduce(max);
       Get.find<LastReadProvider>().feedLastReadAt = lastId;
+    }
 
     return result;
   }
@@ -123,16 +126,21 @@ class PostListController extends GetxController {
             resp = await provider.listRecommendations(
               pageKey,
               channel: 'shuffle',
+              realm: realm,
             );
             break;
           case 1:
             resp = await provider.listRecommendations(
               pageKey,
               channel: 'friends',
+              realm: realm,
             );
             break;
           default:
-            resp = await provider.listRecommendations(pageKey);
+            resp = await provider.listRecommendations(
+              pageKey,
+              realm: realm,
+            );
             break;
         }
       }

lib/main.dart

@@ -15,6 +15,7 @@ import 'package:solian/providers/attachment_uploader.dart';
 import 'package:solian/providers/daily_sign.dart';
 import 'package:solian/providers/last_read.dart';
 import 'package:solian/providers/link_expander.dart';
+import 'package:solian/providers/navigation.dart';
 import 'package:solian/providers/stickers.dart';
 import 'package:solian/providers/theme_switcher.dart';
 import 'package:solian/providers/websocket.dart';
@@ -123,6 +124,8 @@ class SolianApp extends StatelessWidget {
   }
 
   void _initializeProviders(BuildContext context) async {
+    Get.put(NavigationStateProvider());
+
     Get.lazyPut(() => AuthProvider());
     Get.lazyPut(() => RelationshipProvider());
     Get.lazyPut(() => PostProvider());

lib/providers/navigation.dart

@@ -0,0 +1,6 @@
+import 'package:get/get.dart';
+import 'package:solian/models/realm.dart';
+
+class NavigationStateProvider extends GetxController {
+  final Rx<Realm?> focusedRealm = Rx(null);
+}

lib/screens/feed.dart

@@ -1,8 +1,11 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:gap/gap.dart';
 import 'package:get/get.dart';
 import 'package:solian/controllers/post_list_controller.dart';
 import 'package:solian/providers/auth.dart';
+import 'package:solian/providers/navigation.dart';
 import 'package:solian/router.dart';
 import 'package:solian/screens/account/notification.dart';
 import 'package:solian/theme.dart';
@@ -25,21 +28,34 @@ class _FeedScreenState extends State<FeedScreen>
   late final PostListController _postController;
   late final TabController _tabController;
 
+  List<StreamSubscription>? _subscriptions;
+
   @override
   void initState() {
     super.initState();
+    final navState = Get.find<NavigationStateProvider>();
     _postController = PostListController();
+    _postController.realm = navState.focusedRealm.value?.alias;
     _tabController = TabController(length: 3, vsync: this);
     _tabController.addListener(() {
       if (_postController.mode.value == _tabController.index) return;
       _postController.mode.value = _tabController.index;
       _postController.reloadAllOver();
     });
+    _subscriptions = [
+      Get.find<NavigationStateProvider>().focusedRealm.listen((value) {
+        if (value?.alias != _postController.realm) {
+          _postController.realm = value?.alias;
+          _postController.reloadAllOver();
+        }
+      }),
+    ];
   }
 
   @override
   Widget build(BuildContext context) {
     final AuthProvider auth = Get.find();
+    final NavigationStateProvider navState = Get.find();
 
     return Material(
       color: Theme.of(context).colorScheme.surface,
@@ -96,7 +112,18 @@ class _FeedScreenState extends State<FeedScreen>
               );
             }
 
-            return TabBarView(
+            return Column(
+              children: [
+                if (navState.focusedRealm.value != null)
+                  MaterialBanner(
+                    leading: const Icon(Icons.layers),
+                    content: Text(
+                      'Browsing in realm #${navState.focusedRealm.value!.alias}',
+                    ),
+                    actions: const [SizedBox.shrink()],
+                  ),
+                Expanded(
+                  child: TabBarView(
                     physics: const NeverScrollableScrollPhysics(),
                     controller: _tabController,
                     children: [
@@ -128,6 +155,9 @@ class _FeedScreenState extends State<FeedScreen>
                       }),
                       PostShuffleSwiper(controller: _postController),
                     ],
+                  ),
+                ),
+              ],
             );
           }),
         ),
@@ -138,6 +168,11 @@ class _FeedScreenState extends State<FeedScreen>
   @override
   void dispose() {
     _postController.dispose();
+    if (_subscriptions != null) {
+      for (final subscription in _subscriptions!) {
+        subscription.cancel();
+      }
+    }
     super.dispose();
   }
 }

lib/widgets/navigation/app_navigation_region.dart

@@ -4,6 +4,7 @@ import 'package:solian/models/realm.dart';
 import 'package:solian/providers/auth.dart';
 import 'package:solian/providers/content/channel.dart';
 import 'package:solian/providers/content/realm.dart';
+import 'package:solian/providers/navigation.dart';
 import 'package:solian/widgets/account/account_avatar.dart';
 import 'package:solian/widgets/channel/channel_list.dart';
 
@@ -21,8 +22,6 @@ class AppNavigationRegion extends StatefulWidget {
 
 class _AppNavigationRegionState extends State<AppNavigationRegion>
     with SingleTickerProviderStateMixin {
-  Realm? _focusedRealm;
-
   bool _isTryingExit = false;
 
   late final AnimationController _animationController = AnimationController(
@@ -39,14 +38,18 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
 
   void _focusRealm(Realm item) {
     _animationController.animateTo(1).then((_) {
-      setState(() => _focusedRealm = item);
+      setState(
+        () => Get.find<NavigationStateProvider>().focusedRealm.value = item,
+      );
       _animationController.animateTo(0);
     });
   }
 
   void _unFocusRealm() {
     _animationController.animateTo(1).then((_) {
-      setState(() => _focusedRealm = null);
+      setState(
+        () => Get.find<NavigationStateProvider>().focusedRealm.value = null,
+      );
       _animationController.animateTo(0);
     });
   }
@@ -58,6 +61,7 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
   }
 
   Widget _buildRealmFocusAvatar() {
+    final focusedRealm = Get.find<NavigationStateProvider>().focusedRealm.value;
     return MouseRegion(
       child: AnimatedSwitcher(
         switchInCurve: Curves.fastOutSlowIn,
@@ -83,7 +87,7 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
                 ),
                 onTap: () => _unFocusRealm(),
               )
-            : _buildEntryAvatar(_focusedRealm!),
+            : _buildEntryAvatar(focusedRealm!),
       ),
       onEnter: (_) => setState(() => _isTryingExit = true),
       onExit: (_) => setState(() => _isTryingExit = false),
@@ -137,8 +141,10 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
     final RealmProvider realms = Get.find();
     final ChannelProvider channels = Get.find();
     final AuthProvider auth = Get.find();
+    final NavigationStateProvider navState = Get.find();
 
-    return AnimatedBuilder(
+    return Obx(
+      () => AnimatedBuilder(
         animation: _animationController,
         builder: (context, child) {
           return SlideTransition(
@@ -146,10 +152,9 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
             child: child,
           );
         },
-      child: _focusedRealm == null
+        child: navState.focusedRealm.value == null
-          ? Obx(() {
+            ? widget.isCollapsed
-              if (widget.isCollapsed) {
+                ? CustomScrollView(
-                return CustomScrollView(
                     slivers: [
                       const SliverPadding(padding: EdgeInsets.only(top: 8)),
                       SliverList.builder(
@@ -163,10 +168,8 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
                         },
                       ),
                     ],
-                );
+                  )
-              }
+                : CustomScrollView(
-
-              return CustomScrollView(
                     slivers: [
                       const SliverPadding(padding: EdgeInsets.only(top: 8)),
                       SliverList.builder(
@@ -178,13 +181,12 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
                       ),
                       const SliverPadding(padding: EdgeInsets.only(bottom: 8)),
                     ],
-              );
+                  )
-            })
             : Column(
                 children: [
                   if (widget.isCollapsed)
                     Tooltip(
-                    message: _focusedRealm!.name,
+                      message: navState.focusedRealm.value!.name,
                       child: _buildRealmFocusAvatar().paddingSymmetric(
                         vertical: 8,
                       ),
@@ -195,11 +197,11 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
                       tileColor:
                           Theme.of(context).colorScheme.surfaceContainerLow,
                       leading: _buildRealmFocusAvatar(),
-                    contentPadding:
+                      contentPadding: const EdgeInsets.symmetric(
-                        const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
+                          horizontal: 20, vertical: 8),
-                    title: Text(_focusedRealm!.name),
+                      title: Text(navState.focusedRealm.value!.name),
                       subtitle: Text(
-                      _focusedRealm!.description,
+                        navState.focusedRealm.value!.description,
                         maxLines: 1,
                         overflow: TextOverflow.ellipsis,
                       ),
@@ -209,7 +211,9 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
                       () => ChannelListWidget(
                         channels: channels.availableChannels
                             .where(
-                            (x) => x.realm?.externalId == _focusedRealm?.id,
+                              (x) =>
+                                  x.realm?.id ==
+                                  navState.focusedRealm.value?.id,
                             )
                             .toList(),
                         selfId: auth.userProfile.value!['id'],
@@ -219,6 +223,7 @@ class _AppNavigationRegionState extends State<AppNavigationRegion>
                   ),
                 ],
               ),
+      ),
     );
   }
 }