merge: 合并 K95.1 首次切换频道无感

lib/core/data/services/home_feed_controller.dart

@@ -52,6 +52,14 @@ class HomeFeedController extends ChangeNotifier {
     _notifyIfCurrent(HomeFeedChannel.recommend);
   }
 
+  /// 后台预取漫剧与真人剧首屏，不切换频道，也不影响当前列表。
+  Future<void> prefetchChannels() async {
+    await Future.wait([
+      _prefetchChannel(HomeFeedChannel.anime),
+      _prefetchChannel(HomeFeedChannel.live),
+    ]);
+  }
+
   /// 同步切到目标频道；有缓存先渲染，无缓存时复用或等待在飞请求。
   Future<void> selectChannel(HomeFeedChannel next) async {
     if (next == _channel) return;
@@ -59,7 +67,9 @@ class HomeFeedController extends ChangeNotifier {
     _notify();
     final state = _state(next);
     if (state.dramas.isNotEmpty) {
-      if (!state.loading) {
+      if (state.skipNextRefresh) {
+        state.skipNextRefresh = false;
+      } else if (!state.loading) {
         unawaited(_refresh(next, keepData: true));
       }
       return;
@@ -67,6 +77,7 @@ class HomeFeedController extends ChangeNotifier {
     if (state.loading) {
       final inFlight = state.inFlight;
       if (inFlight != null) await inFlight;
+      state.skipNextRefresh = false;
       return;
     }
     await _refresh(next, keepData: false);
@@ -126,6 +137,13 @@ class HomeFeedController extends ChangeNotifier {
     return operation;
   }
 
+  Future<void> _prefetchChannel(HomeFeedChannel channel) async {
+    final state = _state(channel);
+    if (state.loaded || state.loading) return;
+    final success = await _refresh(channel, keepData: false);
+    if (success && !_disposed) state.skipNextRefresh = true;
+  }
+
   Future<bool> _performRefresh(
     HomeFeedChannel channel, {
     required bool keepData,
@@ -200,4 +218,5 @@ class _ChannelFeedState {
   String? lastError;
   int requestSeq = 0;
   Future<bool>? inFlight;
+  bool skipNextRefresh = false;
 }

lib/pages/home/home_view.dart

@@ -8,6 +8,7 @@ import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 
 import '../../core/config/app_config.dart';
+import '../../core/data/models/drama.dart';
 import '../../core/data/services/home_feed_controller.dart';
 import '../../core/data/services/catalog_controller.dart';
 import '../../core/data/services/catalog_retry.dart';
@@ -141,7 +142,7 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
       _recommendSeeded = true;
       homeFeed.seedRecommend(catalog.dramas);
       WidgetsBinding.instance.addPostFrameCallback((_) {
-        if (mounted) unawaited(homeFeed.refreshCurrent());
+        if (mounted) unawaited(_refreshRecommendAndPrefetch(homeFeed));
       });
     }
     return _HomeTabs(key: const Key('home-tabs'), feedController: homeFeed);
@@ -151,6 +152,12 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
     return _homeFeed ??= HomeFeedController(catalog.repository);
   }
 
+  Future<void> _refreshRecommendAndPrefetch(HomeFeedController homeFeed) async {
+    if (await homeFeed.refreshCurrent()) {
+      await homeFeed.prefetchChannels();
+    }
+  }
+
   Widget _startupSplash() {
     final isAndroid = defaultTargetPlatform == TargetPlatform.android;
     final size = isAndroid ? _androidSplashSize : _defaultSplashSize;
@@ -222,11 +229,15 @@ class _HomeTabs extends StatefulWidget {
 
 class _HomeTabsState extends State<_HomeTabs> {
   late final HomeLogic logic;
+  List<Drama>? _visibleDramas;
+  HomeFeedChannel? _visibleChannel;
 
   @override
   void initState() {
     super.initState();
     logic = HomeBinding().create(widget.feedController.dramas);
+    _visibleDramas = widget.feedController.dramas;
+    _visibleChannel = widget.feedController.channel;
     widget.feedController.addListener(_onFeedChanged);
   }
 
@@ -291,26 +302,70 @@ class _HomeTabsState extends State<_HomeTabs> {
   }
 
   Widget _home(BuildContext context) {
-    final dramas = widget.feedController.dramas;
-    if (dramas.isEmpty) return _feedChannelPlaceholder(context);
-    return PlayerPage(
-      homeMode: true,
-      embedded: true,
-      active: logic.tab == 0,
-      drama: dramas.first,
-      initialIndex: 0,
-      feedDramas: dramas,
-      feedChannel: widget.feedController.channel,
-      onOpenFullPlayer: (drama, episode) =>
-          logic.playDrama(context, drama, episodeId: episode.id),
-      onRefreshFeed: widget.feedController.refreshCurrent,
-      onLoadMore: widget.feedController.loadMore,
-      onChannelSelected: _selectFeedChannel,
-      onDramaChanged: logic.onDramaChanged,
-      onImmersiveChanged: logic.onImmersiveChanged,
-      onSearch: () => logic.select(1, search: true),
-      onDiscover: () => logic.select(1),
-      onMy: () => logic.select(3),
+    final currentDramas = widget.feedController.dramas;
+    final currentChannel = widget.feedController.channel;
+    if (currentDramas.isNotEmpty) {
+      _visibleDramas = currentDramas;
+      _visibleChannel = currentChannel;
+    }
+    if (currentDramas.isEmpty && !widget.feedController.loadingFirstPage) {
+      return _feedChannelPlaceholder(context);
+    }
+    final visibleDramas = _visibleDramas;
+    final visibleChannel = _visibleChannel;
+    final switching =
+        currentDramas.isEmpty && widget.feedController.loadingFirstPage;
+    if (visibleDramas == null ||
+        visibleDramas.isEmpty ||
+        visibleChannel == null) {
+      return _feedChannelPlaceholder(context);
+    }
+    final playerDramas = currentDramas.isEmpty ? visibleDramas : currentDramas;
+    final playerChannel = currentDramas.isEmpty
+        ? visibleChannel
+        : currentChannel;
+    return Stack(
+      fit: StackFit.expand,
+      children: [
+        PlayerPage(
+          homeMode: true,
+          embedded: true,
+          active: logic.tab == 0,
+          drama: playerDramas.first,
+          initialIndex: 0,
+          feedDramas: playerDramas,
+          feedChannel: playerChannel,
+          headerChannel: currentChannel,
+          onOpenFullPlayer: (drama, episode) =>
+              logic.playDrama(context, drama, episodeId: episode.id),
+          onRefreshFeed: widget.feedController.refreshCurrent,
+          onLoadMore: widget.feedController.loadMore,
+          onChannelSelected: _selectFeedChannel,
+          onDramaChanged: logic.onDramaChanged,
+          onImmersiveChanged: logic.onImmersiveChanged,
+          onSearch: () => logic.select(1, search: true),
+          onDiscover: () => logic.select(1),
+          onMy: () => logic.select(3),
+        ),
+        if (switching)
+          Positioned.fill(
+            child: IgnorePointer(
+              key: const Key('home-feed-channel-loading'),
+              child: ColoredBox(
+                color: Colors.black26,
+                child: Center(
+                  child: SizedBox.square(
+                    dimension: 24,
+                    child: CircularProgressIndicator(
+                      strokeWidth: 2.4,
+                      color: Colors.white70,
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ),
+      ],
     );
   }
 

lib/pages/player/player_view.dart

@@ -59,6 +59,7 @@ class PlayerPage extends StatefulWidget {
     this.onMenu,
     this.feedDramas,
     this.feedChannel,
+    this.headerChannel,
     this.onDramaChanged,
     this.onImmersiveChanged,
     this.onOpenFullPlayer,
@@ -82,6 +83,7 @@ class PlayerPage extends StatefulWidget {
   final VoidCallback? onMenu;
   final List<Drama>? feedDramas;
   final HomeFeedChannel? feedChannel;
+  final HomeFeedChannel? headerChannel;
   final ValueChanged<Drama>? onDramaChanged;
   final ValueChanged<bool>? onImmersiveChanged;
   final Future<void> Function(Drama drama, Episode episode)? onOpenFullPlayer;
@@ -295,7 +297,10 @@ class _PlayerPageState extends State<PlayerPage>
               bottom: false,
               child: HomeFeedHeader(
                 l10n: l10n,
-                channel: widget.feedChannel ?? HomeFeedChannel.recommend,
+                channel:
+                    widget.headerChannel ??
+                    widget.feedChannel ??
+                    HomeFeedChannel.recommend,
                 onChannelSelected: widget.onChannelSelected ?? (_) {},
                 onRefresh: () async {
                   final ok = await widget.onRefreshFeed?.call() ?? true;

test/core/data/services/home_feed_controller_test.dart

@@ -27,6 +27,67 @@ void main() {
     },
   );
 
+  test(
+    'should_use_prefetched_channel_without_another_request_on_first_select',
+    () async {
+      final repository = _ScriptedFeedRepository()
+        ..enqueue(() async => FeedPage(dramas: [_drama('anime')]))
+        ..enqueue(() async => FeedPage(dramas: [_drama('live')]));
+      final controller = HomeFeedController(repository);
+      controller.seedRecommend([_drama('seed')]);
+
+      await controller.prefetchChannels();
+      await controller.selectChannel(HomeFeedChannel.anime);
+
+      expect(controller.dramas.single.id, 'anime');
+      expect(repository.calls.map((call) => call.types), [
+        ['ANIME'],
+        ['LIVE'],
+      ]);
+      controller.dispose();
+    },
+  );
+
+  test('should_keep_recommend_when_prefetch_fails', () async {
+    final repository = _ScriptedFeedRepository()
+      ..enqueue(() async => throw StateError('offline'))
+      ..enqueue(() async => FeedPage(dramas: [_drama('live')]));
+    final controller = HomeFeedController(repository);
+    controller.seedRecommend([_drama('seed')]);
+
+    await controller.prefetchChannels();
+
+    expect(controller.channel, HomeFeedChannel.recommend);
+    expect(controller.dramas.single.id, 'seed');
+    expect(controller.lastError, isNull);
+    controller.dispose();
+  });
+
+  test(
+    'should_wait_prefetch_without_duplicate_request_when_channel_is_selected',
+    () async {
+      final anime = Completer<FeedPage>();
+      final repository = _ScriptedFeedRepository()
+        ..enqueue(() => anime.future)
+        ..enqueue(() async => FeedPage(dramas: [_drama('live')]));
+      final controller = HomeFeedController(repository);
+      controller.seedRecommend([_drama('seed')]);
+
+      final prefetch = controller.prefetchChannels();
+      final select = controller.selectChannel(HomeFeedChannel.anime);
+      anime.complete(FeedPage(dramas: [_drama('anime')]));
+      await prefetch;
+      await select;
+
+      expect(
+        repository.calls.where((call) => call.types.contains('ANIME')),
+        hasLength(1),
+      );
+      expect(controller.dramas.single.id, 'anime');
+      controller.dispose();
+    },
+  );
+
   test('should_request_anime_live_and_recommend_with_expected_types', () async {
     final repository = _ScriptedFeedRepository()
       ..enqueue(() async => FeedPage(dramas: [_drama('anime')]))

test/home/k28_a_navigation_test.dart

@@ -1,12 +1,16 @@
 // Author: fruit.com.cn
 
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:fruitshorts/app.dart';
+import 'package:fruitshorts/core/data/models/feed_page.dart';
 import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
 import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
 import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
+import 'package:fruitshorts/pages/home/home_feed_channel.dart';
 import 'package:fruitshorts/pages/player/player_view.dart';
 import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
 import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
@@ -130,6 +134,44 @@ void main() {
     expect(find.byKey(const Key('home-feed-title')), findsOneWidget);
   });
 
+  testWidgets('should_keep_player_when_first_anime_switch_is_loading', (
+    tester,
+  ) async {
+    final catalog = _PendingAnimeCatalog();
+    await _pumpApp(tester, catalog: catalog);
+    for (var attempt = 0; attempt < 5 && catalog.animeCalls == 0; attempt++) {
+      await tester.pump();
+    }
+    expect(catalog.animeCalls, 1);
+
+    await tester.tap(find.byKey(const Key('home-feed-tab-anime')));
+    await tester.pump();
+
+    expect(find.byType(PlayerPage), findsOneWidget);
+    expect(find.byKey(const Key('home-feed-channel-loading')), findsOneWidget);
+
+    catalog.anime.complete(FeedPage(dramas: [demoDramas[1]]));
+    await tester.pumpAndSettle();
+
+    expect(find.byKey(const Key('home-feed-channel-loading')), findsNothing);
+    expect(
+      tester.widget<PlayerPage>(find.byType(PlayerPage)).feedChannel,
+      HomeFeedChannel.anime,
+    );
+  });
+
+  testWidgets('should_show_empty_state_when_anime_has_no_dramas', (
+    tester,
+  ) async {
+    await _pumpApp(tester, catalog: _EmptyAnimeCatalog());
+
+    await tester.tap(find.byKey(const Key('home-feed-tab-anime')));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(PlayerPage), findsNothing);
+    expect(find.text('No stories available yet.'), findsOneWidget);
+  });
+
   testWidgets('should_refresh_feed_without_blank_loading', (tester) async {
     await _pumpApp(tester);
 
@@ -446,19 +488,20 @@ bool _hasLightStatusBar(WidgetTester tester) => tester
 Future<void> _pumpApp(
   WidgetTester tester, {
   Size size = const Size(390, 844),
+  FakeCatalogRepository? catalog,
 }) async {
   tester.view.physicalSize = size;
   tester.view.devicePixelRatio = 1;
   addTearDown(tester.view.resetPhysicalSize);
   addTearDown(tester.view.resetDevicePixelRatio);
-  final catalog = FakeCatalogRepository();
+  final repository = catalog ?? FakeCatalogRepository();
   await tester.pumpWidget(
     LumaDramaApp(
       playerFactory: createWidgetPlayer,
-      catalogRepository: catalog,
-      categoryRepository: FakeCategoryRepository(catalog: catalog),
+      catalogRepository: repository,
+      categoryRepository: FakeCategoryRepository(catalog: repository),
       watchHistoryRepository: InMemoryWatchHistoryRepository(),
-      favoriteRepository: InMemoryFavoriteRepository(cards: catalog.dramas),
+      favoriteRepository: InMemoryFavoriteRepository(cards: repository.dramas),
       playbackRepository: FakePlaybackRepository(),
       commentRepository: FakeCommentRepository(),
       interactionRepository: FakeInteractionRepository(),
@@ -467,3 +510,35 @@ Future<void> _pumpApp(
   );
   await tester.pumpAndSettle();
 }
+
+class _PendingAnimeCatalog extends FakeCatalogRepository {
+  final anime = Completer<FeedPage>();
+  int animeCalls = 0;
+
+  @override
+  Future<FeedPage> fetchFeed({
+    List<String> types = const [],
+    String? cursor,
+    int size = 10,
+  }) {
+    if (types.contains('ANIME')) {
+      animeCalls++;
+      return anime.future;
+    }
+    return super.fetchFeed(types: types, cursor: cursor, size: size);
+  }
+}
+
+class _EmptyAnimeCatalog extends FakeCatalogRepository {
+  @override
+  Future<FeedPage> fetchFeed({
+    List<String> types = const [],
+    String? cursor,
+    int size = 10,
+  }) {
+    if (types.contains('ANIME')) {
+      return Future.value(const FeedPage(dramas: []));
+    }
+    return super.fetchFeed(types: types, cursor: cursor, size: size);
+  }
+}