merge: 支持横向切换三个内容页

docs/plans/PROGRESS.md

@@ -1200,3 +1200,9 @@ $ flutter test
 - 标题、剧名行和观看全集统一通过 `playDramaFromCatalog` 打开非 `homeMode` 逐集播放页。
 - 仅含集数的剧集标题不再显示在标题上方，集数只保留下方进度文案。
 - `flutter analyze`：No issues found。
+
+## 2026-10-22 推荐页横向切换
+
+- 推荐、剧单、全部短剧改为共享 PageController 的横向 PageView，点击与滑动均驱动同一选中态。
+- 三页使用 AutomaticKeepAliveClientMixin 保留视频、滚动位置和筛选状态；顶部导航固定在外层。
+- `flutter analyze`：No issues found。

lib/pages/recommend/recommend_page.dart

@@ -38,8 +38,15 @@ class RecommendPage extends StatefulWidget {
 
 class _RecommendPageState extends State<RecommendPage> {
   RecommendInnerTab _tab = RecommendInnerTab.feed;
+  final PageController _pageController = PageController();
   int _scrubCancelRequest = 0;
 
+  @override
+  void dispose() {
+    _pageController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     final categories = context.read<CategoryController>();
@@ -51,23 +58,35 @@ class _RecommendPageState extends State<RecommendPage> {
           Positioned.fill(
             child: ListenableBuilder(
               listenable: Listenable.merge([widget.feedController, categories]),
-              builder: (context, _) => IndexedStack(
-                index: _tab.index,
+              builder: (context, _) => PageView(
+                key: const Key('recommend-tab-page-view'),
+                controller: _pageController,
+                scrollDirection: Axis.horizontal,
+                onPageChanged: _onPageChanged,
                 children: [
-                  _recommendFeed(context),
-                  _withTopNavSpace(
-                    RecommendSectionsView(
-                      feedController: widget.feedController,
-                      categories: categories,
-                      onOpenDrama: _openDrama,
-                      onMore: _handleMore,
+                  _KeepAliveTab(
+                    key: const PageStorageKey('recommend-tab-feed'),
+                    child: _recommendFeed(context),
+                  ),
+                  _KeepAliveTab(
+                    key: const PageStorageKey('recommend-tab-playlists'),
+                    child: _withTopNavSpace(
+                      RecommendSectionsView(
+                        feedController: widget.feedController,
+                        categories: categories,
+                        onOpenDrama: _openDrama,
+                        onMore: _handleMore,
+                      ),
                     ),
                   ),
-                  _withTopNavSpace(
-                    AllDramasFilterGrid(
-                      feedController: widget.feedController,
-                      onOpenDrama: _openDrama,
-                      onOpenFilter: widget.onOpenFilter,
+                  _KeepAliveTab(
+                    key: const PageStorageKey('recommend-tab-all'),
+                    child: _withTopNavSpace(
+                      AllDramasFilterGrid(
+                        feedController: widget.feedController,
+                        onOpenDrama: _openDrama,
+                        onOpenFilter: widget.onOpenFilter,
+                      ),
                     ),
                   ),
                 ],
@@ -162,6 +181,24 @@ class _RecommendPageState extends State<RecommendPage> {
       _tab = tab;
       _scrubCancelRequest++;
     });
+    if (_pageController.hasClients) {
+      unawaited(
+        _pageController.animateToPage(
+          tab.index,
+          duration: const Duration(milliseconds: 220),
+          curve: Curves.easeOut,
+        ),
+      );
+    }
+  }
+
+  void _onPageChanged(int index) {
+    final next = RecommendInnerTab.values[index];
+    if (next == _tab) return;
+    setState(() {
+      _tab = next;
+      _scrubCancelRequest++;
+    });
   }
 
   void _handleSearch() {
@@ -180,10 +217,31 @@ class _RecommendPageState extends State<RecommendPage> {
   }
 
   void _handleMore(RecommendSectionKind section) {
-    setState(() => _tab = RecommendInnerTab.allDramas);
+    _selectTab(RecommendInnerTab.allDramas);
   }
 
   Future<void> _openDrama(Drama drama, {String? episodeId}) async {
     await playDramaFromCatalog(context, drama, episodeId: episodeId);
   }
 }
+
+class _KeepAliveTab extends StatefulWidget {
+  const _KeepAliveTab({super.key, required this.child});
+
+  final Widget child;
+
+  @override
+  State<_KeepAliveTab> createState() => _KeepAliveTabState();
+}
+
+class _KeepAliveTabState extends State<_KeepAliveTab>
+    with AutomaticKeepAliveClientMixin<_KeepAliveTab> {
+  @override
+  bool get wantKeepAlive => true;
+
+  @override
+  Widget build(BuildContext context) {
+    super.build(context);
+    return widget.child;
+  }
+}

test/recommend/recommend_sections_test.dart

@@ -91,7 +91,7 @@ void main() {
     expect(player.homeMode, isTrue);
     expect(player.embedded, isTrue);
     expect(player.showHomeFeedHeader, isFalse);
-    expect(find.byType(PageView), findsOneWidget);
+    expect(find.byType(PageView), findsNWidgets(2));
     expect(find.byKey(const Key('recommend-section-hits')), findsNothing);
     expect(find.byType(AppBottomNav), findsOneWidget);
 
@@ -269,7 +269,7 @@ void main() {
     await tester.tap(find.byKey(const Key('recommend-tab-playlist')));
     await tester.pumpAndSettle();
     expect(find.byKey(const Key('recommend-section-hits')), findsOneWidget);
-    expect(find.byKey(const Key('recommend-feed-player')), findsNothing);
+    expect(find.byKey(const Key('recommend-feed-player')), findsOneWidget);
     expect(find.byType(AppBottomNav), findsOneWidget);
 
     await tester.tap(find.byKey(const Key('recommend-tab-all')));
@@ -278,6 +278,46 @@ void main() {
     expect(find.byKey(const Key('all-dramas-grid')), findsOneWidget);
   });
 
+  testWidgets('should_switch_inner_tabs_with_horizontal_page_swipes', (
+    tester,
+  ) async {
+    await _pumpRecommend(tester);
+    final pages = find.byKey(const Key('recommend-tab-page-view'));
+    final topNavBefore = tester.getRect(
+      find.byKey(const Key('recommend-top-nav')),
+    );
+
+    await tester.drag(pages, const Offset(-320, 0));
+    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('recommend-section-hits')), findsOneWidget);
+    expect(find.byKey(const Key('recommend-feed-player')), findsOneWidget);
+    expect(
+      tester
+          .widget<Text>(
+            find.descendant(
+              of: find.byKey(const Key('recommend-tab-playlist')),
+              matching: find.text('Playlists'),
+            ),
+          )
+          .style
+          ?.color,
+      AppColors.textPrimary,
+    );
+    expect(
+      tester.getRect(find.byKey(const Key('recommend-top-nav'))),
+      topNavBefore,
+    );
+
+    await tester.drag(pages, const Offset(-320, 0));
+    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('all-dramas-grid')), findsOneWidget);
+
+    await tester.drag(pages, const Offset(640, 0));
+    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('recommend-feed-player')), findsOneWidget);
+    expect(find.byKey(const Key('recommend-tab-recommend')), findsOneWidget);
+  });
+
   testWidgets('should_open_standalone_player_from_title_and_watch_all', (
     tester,
   ) async {