feat: persist last active tab and preserve per-tab navigation state

README.md

@@ -14,7 +14,7 @@
 </p>
 
 <p align="center">
-  <a href="https://github.com/RarDog/Prisma/releases"><img src="https://img.shields.io/badge/Version-3.5.4-8A2BE2?style=for-the-badge&logo=semver&logoColor=white" alt="Version 3.5.4" /></a>
+  <a href="https://github.com/RarDog/Prisma/releases"><img src="https://img.shields.io/badge/Version-3.5.5-8A2BE2?style=for-the-badge&logo=semver&logoColor=white" alt="Version 3.5.5" /></a>
   <img src="https://img.shields.io/badge/Flutter-3.47+-02569B?style=for-the-badge&logo=flutter&logoColor=white" alt="Flutter" />
   <img src="https://img.shields.io/badge/Platform-Android%20%7C%20Linux%20%7C%20Windows%20%7C%20macOS-00C853?style=for-the-badge" alt="Platforms" />
   <a href="https://github.com/RarDog/Prisma/wiki"><img src="https://img.shields.io/badge/Wiki-Documentation-FF6F00?style=for-the-badge&logo=gitbook&logoColor=white" alt="Wiki" /></a>

README_RU.md

@@ -14,7 +14,7 @@
 </p>
 
 <p align="center">
-  <a href="https://github.com/RarDog/Prisma/releases"><img src="https://img.shields.io/badge/Version-3.5.4-8A2BE2?style=for-the-badge&logo=semver&logoColor=white" alt="Version 3.5.4" /></a>
+  <a href="https://github.com/RarDog/Prisma/releases"><img src="https://img.shields.io/badge/Version-3.5.5-8A2BE2?style=for-the-badge&logo=semver&logoColor=white" alt="Version 3.5.5" /></a>
   <img src="https://img.shields.io/badge/Flutter-3.47+-02569B?style=for-the-badge&logo=flutter&logoColor=white" alt="Flutter" />
   <img src="https://img.shields.io/badge/Platform-Android%20%7C%20Linux%20%7C%20Windows%20%7C%20macOS-00C853?style=for-the-badge" alt="Platforms" />
   <a href="https://github.com/RarDog/Prisma/wiki"><img src="https://img.shields.io/badge/Wiki-Documentation-FF6F00?style=for-the-badge&logo=gitbook&logoColor=white" alt="Wiki" /></a>

lib/app/app_navigator.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+
+import '../backend/models/post.dart';
+import '../features/post/presentation/post_details_screen.dart';
+import '../features/post/presentation/similar_posts_screen.dart';
+
+class AppNavigator {
+  const AppNavigator._();
+
+  static void openPost(
+    BuildContext context, {
+    required Post post,
+    List<Post>? postsList,
+  }) {
+    Navigator.of(context).push(
+      MaterialPageRoute<void>(
+        builder: (ctx) => PostDetailsScreen(
+          providerId: post.providerId,
+          postId: post.id,
+          initialPost: post,
+          postsList: postsList,
+        ),
+      ),
+    );
+  }
+
+  static void openSimilarPosts(
+    BuildContext context, {
+    required Post post,
+  }) {
+    Navigator.of(context).push(
+      MaterialPageRoute<void>(
+        builder: (ctx) => SimilarPostsScreen(
+          providerId: post.providerId,
+          postId: post.id,
+          initialPost: post,
+        ),
+      ),
+    );
+  }
+}

lib/app/app_version.dart

@@ -1,3 +1,3 @@
-const appDisplayVersion = '3.5.4';
+const appDisplayVersion = '3.5.5';
-const appBuildNumber = 80;
+const appBuildNumber = 81;
 const appReleaseChannel = 'Stable';

lib/app/changelog.dart

@@ -1,4 +1,13 @@
 const prismaChangelog = [
+  PrismaChange(
+    version: '3.5.5',
+    title: 'Сохранение последней вкладки и состояния навигации между разделами',
+    bullets: [
+      'Сохранение последней вкладки: приложение запоминает активный раздел при выходе или закрытии и автоматически открывает его при следующем запуске.',
+      'Независимая история и сохранение места: при переключении между вкладками состояние каждого раздела полностью сохраняется. Например, если открыть публикацию или карточку у артиста и переключиться в поиск или ленту, при возврате обратно вы останетесь ровно на том же посте.',
+      'Бесшовные переходы между ветками навигации: улучшена обработка системной кнопки «Назад», переход по разделам стал еще быстрее и плавнее.',
+    ],
+  ),
   PrismaChange(
     version: '3.5.4',
     title: 'Исправление распознавания MP4-видео и отключение устаревших сервисов Kemono/Coomer',

lib/app/router.dart

@@ -21,116 +21,171 @@ import '../features/settings/presentation/settings_screen.dart';
 import '../features/viewed/presentation/viewed_screen.dart';
 import '../shared/widgets/app_shell.dart';
 
+final branchNavKeys = List.generate(8, (_) => GlobalKey<NavigatorState>());
+
 final appRouterProvider = Provider<GoRouter>((ref) {
   return GoRouter(
     initialLocation: '/',
     routes: [
-      ShellRoute(
+      StatefulShellRoute.indexedStack(
-        builder: (context, state, child) => AppShell(child: child),
+        builder: (context, state, navigationShell) => AppShell(
+          navigationShell: navigationShell,
+          child: navigationShell,
+        ),
+        branches: [
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[0],
+            routes: [
+              GoRoute(
+                path: '/',
+                pageBuilder: (context, state) => _transitionPage(
+                  state,
+                  child: FeedScreen(initialQuery: state.uri.queryParameters['q']),
+                ),
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[1],
+            routes: [
+              GoRoute(
+                path: '/search',
+                builder: (context, state) => const SearchScreen(),
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[2],
+            routes: [
+              GoRoute(
+                path: '/favorites',
+                builder: (context, state) => const FavoritesScreen(),
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[3],
+            routes: [
+              GoRoute(
+                path: '/viewed',
+                builder: (context, state) => const ViewedScreen(),
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[4],
+            routes: [
+              GoRoute(
+                path: '/collections',
+                builder: (context, state) => const CollectionsScreen(),
+                routes: [
+                  GoRoute(
+                    path: ':collectionId',
+                    builder: (context, state) => CollectionDetailsScreen(
+                      collectionId: state.pathParameters['collectionId']!,
+                    ),
+                  ),
+                ],
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[5],
+            routes: [
+              GoRoute(
+                path: '/artists',
+                builder: (context, state) => const ArtistsScreen(),
+                routes: [
+                  GoRoute(
+                    path: ':providerId/:service/:artistId',
+                    builder: (context, state) => ArtistPostsScreen(
+                      providerId: state.pathParameters['providerId']!,
+                      service: state.pathParameters['service']!,
+                      artistId: state.pathParameters['artistId']!,
+                      artistName: state.uri.queryParameters['name'] ??
+                          state.pathParameters['artistId']!,
+                    ),
+                  ),
+                ],
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[6],
+            routes: [
+              GoRoute(
+                path: '/providers',
+                builder: (context, state) => const ProvidersScreen(),
+                routes: [
+                  GoRoute(
+                    path: 'new',
+                    builder: (context, state) => ProviderFormScreen(
+                      initialConfig: state.extra is ContentProviderConfig
+                          ? state.extra! as ContentProviderConfig
+                          : null,
+                    ),
+                  ),
+                  GoRoute(
+                    path: 'check',
+                    builder: (context, state) => const ProviderCheckScreen(),
+                  ),
+                ],
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            navigatorKey: branchNavKeys[7],
+            routes: [
+              GoRoute(
+                path: '/settings',
+                builder: (context, state) => const SettingsScreen(),
+                routes: [
+                  GoRoute(
+                    path: 'hidden',
+                    builder: (context, state) => const HiddenPostsScreen(),
+                  ),
+                  GoRoute(
+                    path: 'cache',
+                    builder: (context, state) => const CacheManagerScreen(),
+                  ),
+                ],
+              ),
+            ],
+          ),
+        ],
+      ),
+      GoRoute(
+        path: '/post/:providerId/:postId',
+        builder: (context, state) {
+          final extra = state.extra;
+          final Post? initialPost;
+          final List<Post>? postsList;
+          if (extra is PostNavigationContext) {
+            initialPost = extra.currentPost;
+            postsList = extra.posts;
+          } else if (extra is Post) {
+            initialPost = extra;
+            postsList = null;
+          } else {
+            initialPost = null;
+            postsList = null;
+          }
+          return PostDetailsScreen(
+            providerId: state.pathParameters['providerId']!,
+            postId: state.pathParameters['postId']!,
+            initialPost: initialPost,
+            postsList: postsList,
+          );
+        },
         routes: [
           GoRoute(
-            path: '/',
+            path: 'similar',
-            pageBuilder: (context, state) => _transitionPage(
-              state,
-              child: FeedScreen(initialQuery: state.uri.queryParameters['q']),
-            ),
-          ),
-          GoRoute(
-            path: '/search',
-            builder: (context, state) => const SearchScreen(),
-          ),
-          GoRoute(
-            path: '/post/:providerId/:postId',
-            builder: (context, state) {
-              final extra = state.extra;
-              final Post? initialPost;
-              final List<Post>? postsList;
-              if (extra is PostNavigationContext) {
-                initialPost = extra.currentPost;
-                postsList = extra.posts;
-              } else if (extra is Post) {
-                initialPost = extra;
-                postsList = null;
-              } else {
-                initialPost = null;
-                postsList = null;
-              }
-              return PostDetailsScreen(
-                providerId: state.pathParameters['providerId']!,
-                postId: state.pathParameters['postId']!,
-                initialPost: initialPost,
-                postsList: postsList,
-              );
-            },
-          ),
-          GoRoute(
-            path: '/post/:providerId/:postId/similar',
             builder: (context, state) => SimilarPostsScreen(
               providerId: state.pathParameters['providerId']!,
               postId: state.pathParameters['postId']!,
               initialPost: state.extra is Post ? state.extra! as Post : null,
             ),
           ),
-          GoRoute(
-            path: '/favorites',
-            builder: (context, state) => const FavoritesScreen(),
-          ),
-          GoRoute(
-            path: '/viewed',
-            builder: (context, state) => const ViewedScreen(),
-          ),
-          GoRoute(
-            path: '/collections',
-            builder: (context, state) => const CollectionsScreen(),
-          ),
-          GoRoute(
-            path: '/collections/:collectionId',
-            builder: (context, state) => CollectionDetailsScreen(
-              collectionId: state.pathParameters['collectionId']!,
-            ),
-          ),
-          GoRoute(
-            path: '/artists',
-            builder: (context, state) => const ArtistsScreen(),
-          ),
-          GoRoute(
-            path: '/artists/:providerId/:service/:artistId',
-            builder: (context, state) => ArtistPostsScreen(
-              providerId: state.pathParameters['providerId']!,
-              service: state.pathParameters['service']!,
-              artistId: state.pathParameters['artistId']!,
-              artistName: state.uri.queryParameters['name'] ??
-                  state.pathParameters['artistId']!,
-            ),
-          ),
-          GoRoute(
-            path: '/providers',
-            builder: (context, state) => const ProvidersScreen(),
-          ),
-          GoRoute(
-            path: '/providers/new',
-            builder: (context, state) => ProviderFormScreen(
-              initialConfig: state.extra is ContentProviderConfig
-                  ? state.extra! as ContentProviderConfig
-                  : null,
-            ),
-          ),
-          GoRoute(
-            path: '/providers/check',
-            builder: (context, state) => const ProviderCheckScreen(),
-          ),
-          GoRoute(
-            path: '/settings',
-            builder: (context, state) => const SettingsScreen(),
-          ),
-          GoRoute(
-            path: '/settings/hidden',
-            builder: (context, state) => const HiddenPostsScreen(),
-          ),
-          GoRoute(
-            path: '/settings/cache',
-            builder: (context, state) => const CacheManagerScreen(),
-          ),
         ],
       ),
     ],

lib/backend/services/settings_service.dart

@@ -64,8 +64,10 @@ class AppSettings {
     this.downloadPathTemplate = '{Artist}/{ID}',
     this.searchHistoryLimit = 500,
     this.tagCacheLimit = 5000,
+    this.lastActiveLocation = '/',
   });
 
+  final String lastActiveLocation;
   final List<String> favoriteArtists;
   final List<String> pawchiveAccounts;
   final bool pawchiveBidirectionalSync;
@@ -165,6 +167,7 @@ class AppSettings {
     lastFeedRating: null,
     searchHistoryLimit: 500,
     tagCacheLimit: 5000,
+    lastActiveLocation: '/',
   );
 
   AppSettings copyWith({
@@ -220,8 +223,10 @@ class AppSettings {
     String? downloadPathTemplate,
     int? searchHistoryLimit,
     int? tagCacheLimit,
+    String? lastActiveLocation,
   }) {
     return AppSettings(
+      lastActiveLocation: lastActiveLocation ?? this.lastActiveLocation,
       favoriteArtists: favoriteArtists ?? this.favoriteArtists,
       pawchiveAccounts: pawchiveAccounts ?? this.pawchiveAccounts,
       pawchiveBidirectionalSync:
@@ -336,6 +341,7 @@ class AppSettings {
         'downloadPathTemplate': downloadPathTemplate,
         'searchHistoryLimit': searchHistoryLimit,
         'tagCacheLimit': tagCacheLimit,
+        'lastActiveLocation': lastActiveLocation,
       };
 
   factory AppSettings.fromJson(Map<String, dynamic> json) => AppSettings(
@@ -455,6 +461,8 @@ class AppSettings {
             defaults.searchHistoryLimit,
         tagCacheLimit: (json['tagCacheLimit'] as num?)?.toInt() ??
             defaults.tagCacheLimit,
+        lastActiveLocation: (json['lastActiveLocation'] as String?) ??
+            defaults.lastActiveLocation,
       );
 
   List<PawchiveAccount> get parsedPawchiveAccounts {
@@ -545,6 +553,14 @@ class SettingsService {
     return updateSettings(settings.copyWith(nsfwEnabled: enabled));
   }
 
+  Future<Result<void>> saveLastActiveLocation(String location) async {
+    final result = await getSettings();
+    if (result is Error<AppSettings>) return Error(result.failure);
+    final settings = (result as Success<AppSettings>).data;
+    if (settings.lastActiveLocation == location) return const Success(null);
+    return updateSettings(settings.copyWith(lastActiveLocation: location));
+  }
+
   Future<Result<void>> saveCacheSettings({
     required int ttlHours,
     required int maxItems,

lib/features/artists/presentation/artist_posts_screen.dart

@@ -3,10 +3,10 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:go_router/go_router.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../core/utils/result.dart';
@@ -791,12 +791,10 @@ class _ArtistPostsScreenState extends ConsumerState<ArtistPostsScreen> {
                                       settings.mediaQualityMode),
                                   favoriteKeys: favoriteKeys,
                                   viewedKeys: viewedKeys,
-                                  onOpen: (post) => context.push(
+                                  onOpen: (post) => AppNavigator.openPost(
-                                    '/post/${post.providerId}/${post.id}',
+                                    context,
-                                    extra: PostNavigationContext(
+                                    post: post,
-                                      currentPost: post,
+                                    postsList: displayedPosts,
-                                      posts: displayedPosts,
-                                    ),
                                   ),
                                   onFavorite: (post) async {
                                     if (favoriteKeys.contains(post.cacheKey)) {

lib/features/artists/presentation/artists_screen.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../core/utils/result.dart';
@@ -1574,12 +1575,10 @@ class _FavoriteArtistMediaStrip extends ConsumerWidget {
                 final isVideo = MediaUrlSelector.isVideo(post);
                 return InkWell(
                   borderRadius: BorderRadius.circular(14),
-                  onTap: () => context.push(
+                  onTap: () => AppNavigator.openPost(
-                    '/post/${post.providerId}/${post.id}',
+                    context,
-                    extra: PostNavigationContext(
+                    post: post,
-                      currentPost: post,
+                    postsList: posts,
-                      posts: posts,
-                    ),
                   ),
                   child: Container(
                     decoration: BoxDecoration(

lib/features/collections/presentation/collection_details_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../shared/widgets/adaptive_scaffold.dart';
@@ -167,12 +168,10 @@ class CollectionDetailsScreen extends ConsumerWidget {
                   mediaQualityMode:
                       MediaQualityMode.fromName(settings.mediaQualityMode),
                   favoriteKeys: favoriteKeys,
-                  onOpen: (post) => context.push(
+                  onOpen: (post) => AppNavigator.openPost(
-                    '/post/${post.providerId}/${post.id}',
+                    context,
-                    extra: PostNavigationContext(
+                    post: post,
-                      currentPost: post,
+                    postsList: items,
-                      posts: items,
-                    ),
                   ),
                   onFavorite: (post) async {
                     if (favoriteKeys.contains(post.cacheKey)) {

lib/features/favorites/presentation/favorites_screen.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../shared/widgets/adaptive_scaffold.dart';
@@ -970,12 +971,10 @@ class _FavoritesScreenState extends ConsumerState<FavoritesScreen> {
       mediaQualityMode: MediaQualityMode.fromName(settings.mediaQualityMode),
       favoriteKeys: posts.map((post) => post.cacheKey).toSet(),
       downloadedKeys: downloadedKeys,
-      onOpen: (post) => context.push(
+      onOpen: (post) => AppNavigator.openPost(
-        '/post/${post.providerId}/${post.id}',
+        context,
-        extra: PostNavigationContext(
+        post: post,
-          currentPost: post,
+        postsList: posts,
-          posts: posts,
-        ),
       ),
       onFavorite: (post) =>
           ref.read(favoritesControllerProvider.notifier).remove(post),

lib/features/feed/presentation/feed_screen.dart

@@ -8,6 +8,7 @@ import 'dart:async';
 import 'package:cached_network_image/cached_network_image.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../core/utils/result.dart';
@@ -331,12 +332,10 @@ class _FeedScreenState extends ConsumerState<FeedScreen>
                             selectionMode: _selectionMode,
                             selectedKeys: _selectedKeys,
                             gridMode: settings.gridMode,
-                            onOpen: (post) => context.push(
+                            onOpen: (post) => AppNavigator.openPost(
-                              '/post/${post.providerId}/${post.id}',
+                              context,
-                              extra: PostNavigationContext(
+                              post: post,
-                                currentPost: post,
+                              postsList: state.posts,
-                                posts: state.posts,
-                              ),
                             ),
                             onPreview: (post) => _showPreview(context, post),
                             onToggleSelected: (post) => _toggleSelected(post),
@@ -392,7 +391,7 @@ class _FeedScreenState extends ConsumerState<FeedScreen>
   void _openRandom(List<Post> posts) {
     if (posts.isEmpty) return;
     final post = posts[Random().nextInt(posts.length)];
-    context.push('/post/${post.providerId}/${post.id}', extra: post);
+    AppNavigator.openPost(context, post: post, postsList: posts);
   }
 
   Future<void> _applySearchQuery(String query) async {

lib/features/post/presentation/post_details_screen.dart

@@ -8,6 +8,7 @@ import 'package:share_plus/share_plus.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/app_strings.dart';
 import '../../../app/motion.dart';
 import '../../../app/responsive.dart';
@@ -872,7 +873,7 @@ class PostDetailsScreen extends ConsumerWidget {
   }
 
   void _openSimilar(BuildContext context, WidgetRef ref, Post post) {
-    context.push('/post/${post.providerId}/${post.id}/similar', extra: post);
+    AppNavigator.openSimilarPosts(context, post: post);
   }
 
   Future<void> _openSourcePage(WidgetRef ref, Post post) async {
@@ -888,7 +889,16 @@ class PostDetailsScreen extends ConsumerWidget {
   }
 
   void _replacePost(BuildContext context, Post post) {
-    context.replace('/post/${post.providerId}/${post.id}', extra: post);
+    Navigator.of(context).pushReplacement(
+      MaterialPageRoute<void>(
+        builder: (ctx) => PostDetailsScreen(
+          providerId: post.providerId,
+          postId: post.id,
+          initialPost: post,
+          postsList: postsList,
+        ),
+      ),
+    );
   }
 
   void _close(BuildContext context) {

lib/features/post/presentation/similar_posts_screen.dart

@@ -1,8 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:go_router/go_router.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../core/utils/result.dart';
@@ -98,9 +98,9 @@ class SimilarPostsScreen extends ConsumerWidget {
                           MediaQualityMode.fromName(settings.mediaQualityMode),
                       favoriteKeys: favorites,
                       viewedKeys: viewed,
-                      onOpen: (post) => context.push(
+                      onOpen: (post) => AppNavigator.openPost(
-                        '/post/${post.providerId}/${post.id}',
+                        context,
-                        extra: post,
+                        post: post,
                       ),
                       onFavorite: (post) =>
                           _toggleFavorite(ref, post, favorites),

lib/features/settings/presentation/hidden_posts_screen.dart

@@ -1,9 +1,9 @@
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:go_router/go_router.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../backend/backend.dart';
 import '../../../core/utils/result.dart';
 import '../../../shared/widgets/adaptive_scaffold.dart';
@@ -62,9 +62,9 @@ class HiddenPostsScreen extends ConsumerWidget {
                     item: item,
                     onOpen: item.post == null
                         ? null
-                        : () => context.push(
+                        : () => AppNavigator.openPost(
-                              '/post/${item.post!.providerId}/${item.post!.id}',
+                              context,
-                              extra: item.post,
+                              post: item.post!,
                             ),
                     onRestore: () async {
                       await ref

lib/features/viewed/presentation/viewed_screen.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../../app/app.dart';
+import '../../../app/app_navigator.dart';
 import '../../../app/responsive.dart';
 import '../../../backend/backend.dart';
 import '../../../shared/widgets/adaptive_scaffold.dart';
@@ -142,12 +143,10 @@ class _ViewedScreenState extends ConsumerState<ViewedScreen> {
                 mediaQualityMode:
                     MediaQualityMode.fromName(settings.mediaQualityMode),
                 favoriteKeys: favoriteKeys,
-                onOpen: (post) => context.push(
+                onOpen: (post) => AppNavigator.openPost(
-                  '/post/${post.providerId}/${post.id}',
+                  context,
-                  extra: PostNavigationContext(
+                  post: post,
-                    currentPost: post,
+                  postsList: allPosts,
-                    posts: allPosts,
-                  ),
                 ),
                 onFavorite: (post) => _toggleFavorite(
                   ref,
@@ -260,12 +259,10 @@ class _ViewedScreenState extends ConsumerState<ViewedScreen> {
                       isFavorite: favoriteKeys.contains(item.post.cacheKey),
                       isRu: isRu,
                       onOpen: () {
-                        context.push(
+                        AppNavigator.openPost(
-                          '/post/${item.post.providerId}/${item.post.id}',
+                          context,
-                          extra: PostNavigationContext(
+                          post: item.post,
-                            currentPost: item.post,
+                          postsList: allPosts,
-                            posts: allPosts,
-                          ),
                         );
                       },
                       onFavorite: () => _toggleFavorite(

lib/shared/widgets/app_shell.dart

@@ -7,13 +7,19 @@ import 'package:go_router/go_router.dart';
 import '../../app/app.dart';
 import '../../app/motion.dart';
 import '../../app/responsive.dart';
+import '../../app/router.dart';
 import '../../backend/backend.dart';
 import '../../core/utils/result.dart';
 
 class AppShell extends ConsumerStatefulWidget {
-  const AppShell({required this.child, super.key});
+  const AppShell({
+    required this.child,
+    this.navigationShell,
+    super.key,
+  });
 
   final Widget child;
+  final StatefulNavigationShell? navigationShell;
 
   static const destinations = [
     _Destination('feed', 'Feed', Icons.dashboard_rounded, '/'),
@@ -33,6 +39,30 @@ class AppShell extends ConsumerStatefulWidget {
     _Destination('settings', 'Settings', Icons.settings_rounded, '/settings'),
   ];
 
+  static int branchIndexForLocation(String location) {
+    if (location.startsWith('/settings')) return 7;
+    if (location.startsWith('/providers')) return 6;
+    if (location.startsWith('/artists')) return 5;
+    if (location.startsWith('/collections')) return 4;
+    if (location.startsWith('/viewed')) return 3;
+    if (location.startsWith('/favorites')) return 2;
+    if (location.startsWith('/search')) return 1;
+    return 0;
+  }
+
+  static String locationForBranchIndex(int index) {
+    return switch (index) {
+      1 => '/search',
+      2 => '/favorites',
+      3 => '/viewed',
+      4 => '/collections',
+      5 => '/artists',
+      6 => '/providers',
+      7 => '/settings',
+      _ => '/',
+    };
+  }
+
   static List<_Destination> _visibleDestinations(
     AppSettings settings,
     bool hasArtists,
@@ -52,11 +82,70 @@ class _AppShellState extends ConsumerState<AppShell> {
   final List<String> _tabHistory = [];
   String? _currentPath;
   bool _isBackNavigating = false;
+  bool _restoredTab = false;
+  late final AppLifecycleListener _lifecycleListener;
+
+  @override
+  void initState() {
+    super.initState();
+    _lifecycleListener = AppLifecycleListener(
+      onStateChange: (state) {
+        if (state == AppLifecycleState.paused ||
+            state == AppLifecycleState.inactive ||
+            state == AppLifecycleState.detached) {
+          _saveCurrentLocation();
+        }
+      },
+    );
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final settings = ref.read(appSettingsProvider).value;
+      _maybeRestoreLastActiveTab(settings);
+    });
+  }
+
+  @override
+  void dispose() {
+    _lifecycleListener.dispose();
+    super.dispose();
+  }
+
+  void _saveCurrentLocation([String? location]) {
+    final loc = location ??
+        _currentPath ??
+        (widget.navigationShell != null
+            ? AppShell.locationForBranchIndex(
+                widget.navigationShell!.currentIndex)
+            : '/');
+    ref.read(settingsServiceProvider).saveLastActiveLocation(loc);
+  }
+
+  void _maybeRestoreLastActiveTab(AppSettings? settings) {
+    if (_restoredTab || settings == null) return;
+    final lastLocation = settings.lastActiveLocation;
+    if (lastLocation.isNotEmpty && lastLocation != '/') {
+      final idx = AppShell.branchIndexForLocation(lastLocation);
+      if (idx > 0 && widget.navigationShell != null) {
+        _restoredTab = true;
+        widget.navigationShell!.goBranch(idx, initialLocation: false);
+      }
+    }
+  }
 
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
     final path = GoRouterState.of(context).uri.path;
+    _syncPath(path);
+  }
+
+  @override
+  void didUpdateWidget(covariant AppShell oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    final path = GoRouterState.of(context).uri.path;
+    _syncPath(path);
+  }
+
+  void _syncPath(String path) {
     if (_isBackNavigating) {
       _isBackNavigating = false;
       _currentPath = path;
@@ -74,10 +163,37 @@ class _AppShellState extends ConsumerState<AppShell> {
       }
     }
     _currentPath = path;
+    _saveCurrentLocation(path);
+  }
+
+  void _onNavigate(String location) {
+    final targetIndex = AppShell.branchIndexForLocation(location);
+    if (widget.navigationShell != null) {
+      if (widget.navigationShell!.currentIndex == targetIndex) {
+        branchNavKeys[targetIndex]
+            .currentState
+            ?.popUntil((route) => route.isFirst);
+      } else {
+        widget.navigationShell!.goBranch(
+          targetIndex,
+          initialLocation: false,
+        );
+      }
+    } else {
+      context.go(location);
+    }
+    _saveCurrentLocation(location);
   }
 
   bool _handleBack() {
-    if (Navigator.of(context).canPop()) {
+    final shell = widget.navigationShell;
+    if (shell != null) {
+      final currentBranchKey = branchNavKeys[shell.currentIndex];
+      if (currentBranchKey.currentState?.canPop() ?? false) {
+        currentBranchKey.currentState?.pop();
+        return true;
+      }
+    } else if (Navigator.of(context).canPop()) {
       Navigator.of(context).pop();
       return true;
     }
@@ -90,13 +206,13 @@ class _AppShellState extends ConsumerState<AppShell> {
     if (_tabHistory.isNotEmpty) {
       final previous = _tabHistory.removeLast();
       _isBackNavigating = true;
-      context.go(previous);
+      _onNavigate(previous);
       return true;
     }
 
-    if (currentPath != '/') {
+    if (currentPath != '/' && (shell == null || shell.currentIndex != 0)) {
       _isBackNavigating = true;
-      context.go('/');
+      _onNavigate('/');
       return true;
     }
 
@@ -105,6 +221,12 @@ class _AppShellState extends ConsumerState<AppShell> {
 
   @override
   Widget build(BuildContext context) {
+    ref.listen<AsyncValue<AppSettings>>(appSettingsProvider, (prev, next) {
+      next.whenData((settings) {
+        _maybeRestoreLastActiveTab(settings);
+      });
+    });
+
     final settings =
         ref.watch(appSettingsProvider).value ?? AppSettings.defaults;
     final artistConfigs =
@@ -147,7 +269,7 @@ class _AppShellState extends ConsumerState<AppShell> {
           actions: {
             _NavigateIntent: CallbackAction<_NavigateIntent>(
               onInvoke: (intent) {
-                context.go(intent.location);
+                _onNavigate(intent.location);
                 return null;
               },
             ),
@@ -164,11 +286,15 @@ class _AppShellState extends ConsumerState<AppShell> {
                 ? _DesktopShell(
                     destinations: destinations,
                     ru: ru,
+                    currentBranchIndex: widget.navigationShell?.currentIndex,
+                    onNavigate: _onNavigate,
                     child: widget.child,
                   )
                 : _MobileShell(
                     destinations: destinations,
                     ru: ru,
+                    currentBranchIndex: widget.navigationShell?.currentIndex,
+                    onNavigate: _onNavigate,
                     child: widget.child,
                   ),
           ),
@@ -183,10 +309,14 @@ class _DesktopShell extends StatefulWidget {
     required this.child,
     required this.destinations,
     required this.ru,
+    required this.onNavigate,
+    this.currentBranchIndex,
   });
   final Widget child;
   final List<_Destination> destinations;
   final bool ru;
+  final ValueChanged<String> onNavigate;
+  final int? currentBranchIndex;
 
   @override
   State<_DesktopShell> createState() => _DesktopShellState();
@@ -198,10 +328,10 @@ class _DesktopShellState extends State<_DesktopShell> {
   @override
   Widget build(BuildContext context) {
     final location = GoRouterState.of(context).uri.path;
+    final activeBranch = widget.currentBranchIndex ??
+        AppShell.branchIndexForLocation(location);
     final selected = widget.destinations.indexWhere(
-      (item) => item.location == '/'
+      (item) => AppShell.branchIndexForLocation(item.location) == activeBranch,
-          ? location == '/'
-          : location.startsWith(item.location),
     );
     return Scaffold(
       body: Row(
@@ -229,7 +359,7 @@ class _DesktopShellState extends State<_DesktopShell> {
                           selected: (selected < 0 ? 0 : selected) == index,
                           expanded: _hovered,
                           onTap: () {
-                            context.go(widget.destinations[index].location);
+                            widget.onNavigate(widget.destinations[index].location);
                           },
                         ),
                       const Spacer(),
@@ -334,10 +464,14 @@ class _MobileShell extends StatelessWidget {
     required this.child,
     required this.destinations,
     required this.ru,
+    required this.onNavigate,
+    this.currentBranchIndex,
   });
   final Widget child;
   final List<_Destination> destinations;
   final bool ru;
+  final ValueChanged<String> onNavigate;
+  final int? currentBranchIndex;
 
   @override
   Widget build(BuildContext context) {
@@ -347,10 +481,10 @@ class _MobileShell extends StatelessWidget {
         .take(6)
         .toList();
     final location = GoRouterState.of(context).uri.path;
+    final activeBranch = currentBranchIndex ??
+        AppShell.branchIndexForLocation(location);
     final selected = items.indexWhere(
-      (item) => item.location == '/'
+      (item) => AppShell.branchIndexForLocation(item.location) == activeBranch,
-          ? location == '/'
-          : location.startsWith(item.location),
     );
     final isKeyboardOpen = MediaQuery.viewInsetsOf(context).bottom > 0;
     final bottomInset = isKeyboardOpen
@@ -368,13 +502,13 @@ class _MobileShell extends StatelessWidget {
         ),
         child: child,
       ),
-      floatingActionButton: (location == '/settings' || isKeyboardOpen)
+      floatingActionButton: (activeBranch == 7 || isKeyboardOpen)
           ? null
           : Padding(
               padding: const EdgeInsets.only(bottom: 0, right: 2),
               child: _LiquidGlassSettingsButton(
                 ru: ru,
-                onTap: () => context.go('/settings'),
+                onTap: () => onNavigate('/settings'),
               ),
             ),
       floatingActionButtonLocation: FloatingActionButtonLocation.endFloat,
@@ -383,7 +517,7 @@ class _MobileShell extends StatelessWidget {
           : _LiquidGlassBottomBar(
               selectedIndex: selected < 0 ? 0 : selected,
               onDestinationSelected: (index) =>
-                  context.go(items[index].location),
+                  onNavigate(items[index].location),
               items: items,
               ru: ru,
             ),

pubspec.yaml

@@ -1,7 +1,7 @@
 name: gel_rule_app
 description: Local backend/core layer for a Flutter booru browser app.
 publish_to: "none"
-version: 3.5.4+80
+version: 3.5.5+81
 
 environment:
   sdk: ">=3.3.0 <4.0.0"

test/features/tab_navigation_preservation_test.dart

@@ -0,0 +1,47 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gel_rule_app/backend/backend.dart';
+import 'package:gel_rule_app/shared/widgets/app_shell.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('Tab Navigation & State Preservation Tests', () {
+    test('AppShell branchIndexForLocation and locationForBranchIndex map correctly', () {
+      expect(AppShell.branchIndexForLocation('/'), 0);
+      expect(AppShell.branchIndexForLocation('/?q=test'), 0);
+      expect(AppShell.branchIndexForLocation('/search'), 1);
+      expect(AppShell.branchIndexForLocation('/favorites'), 2);
+      expect(AppShell.branchIndexForLocation('/viewed'), 3);
+      expect(AppShell.branchIndexForLocation('/collections'), 4);
+      expect(AppShell.branchIndexForLocation('/collections/123'), 4);
+      expect(AppShell.branchIndexForLocation('/artists'), 5);
+      expect(AppShell.branchIndexForLocation('/artists/pawchive/patreon/99'), 5);
+      expect(AppShell.branchIndexForLocation('/providers'), 6);
+      expect(AppShell.branchIndexForLocation('/settings'), 7);
+      expect(AppShell.branchIndexForLocation('/settings/hidden'), 7);
+
+      expect(AppShell.locationForBranchIndex(0), '/');
+      expect(AppShell.locationForBranchIndex(1), '/search');
+      expect(AppShell.locationForBranchIndex(2), '/favorites');
+      expect(AppShell.locationForBranchIndex(3), '/viewed');
+      expect(AppShell.locationForBranchIndex(4), '/collections');
+      expect(AppShell.locationForBranchIndex(5), '/artists');
+      expect(AppShell.locationForBranchIndex(6), '/providers');
+      expect(AppShell.locationForBranchIndex(7), '/settings');
+    });
+
+    test('AppSettings preserves lastActiveLocation in JSON serialization', () {
+      const defaults = AppSettings.defaults;
+      expect(defaults.lastActiveLocation, '/');
+
+      final updated = defaults.copyWith(lastActiveLocation: '/artists/pawchive/patreon/12345');
+      expect(updated.lastActiveLocation, '/artists/pawchive/patreon/12345');
+
+      final json = updated.toJson();
+      expect(json['lastActiveLocation'], '/artists/pawchive/patreon/12345');
+
+      final restored = AppSettings.fromJson(json);
+      expect(restored.lastActiveLocation, '/artists/pawchive/patreon/12345');
+    });
+  });
+}