feat(home): 首页按内容类型分频道 Feed 并支持分页

lib/pages/player/player_logic.dart

@@ -100,6 +100,8 @@ class PlayerLogic extends ChangeNotifier {
   ValueChanged<Drama>? onDramaChanged;
   ValueChanged<bool>? onImmersiveChanged;
   bool _disposed = false;
+  PlayerFactory? _sessionFactory;
+  PlaybackCoordinator? _sessionCoordinator;
 
   /// [start] 是否已经跑过：没跑过时 session/pages 还是 late 未初始化，
   /// dispose 不能直接碰它们（例如页面构建失败或纯逻辑测试）。
@@ -109,6 +111,14 @@ class PlayerLogic extends ChangeNotifier {
 
   bool get chromeHidden => immersive;
 
+  /// 当前 PageView 对应用户正在观看的短剧 id，尚未起播时为 null。
+  String? get currentDramaId {
+    if (!_started || visibleIndices.isEmpty) return null;
+    final index = session.currentIndex;
+    if (index < 0 || index >= queue.length) return null;
+    return queue.entryAt(index).drama.id;
+  }
+
   Episode displayEpisode(Drama drama, Episode fallback) {
     final number = pickedEpisode[drama.id];
     if (number == null) return fallback;
@@ -145,6 +155,8 @@ class PlayerLogic extends ChangeNotifier {
     required PlaybackCoordinator coordinator,
   }) {
     _started = true;
+    _sessionFactory = factory;
+    _sessionCoordinator = coordinator;
     pictureInPicture.setStateListener(onPipChanged);
     queue = feedDramas == null
         ? PlaybackQueue.series(pageDrama)
@@ -153,7 +165,53 @@ class PlayerLogic extends ChangeNotifier {
     pages = PageController(initialPage: initialIndex);
     // 票据解析后要把新地址写回这个列表（PlaybackSession 的 canPlay 读的就是它）
     sessionEpisodes = [for (final entry in queue.entries) entry.episode];
-    session = PlaybackSession(
+    session = _createSession(factory, coordinator);
+    if (!active || visibleIndices.isEmpty) {
+      session.setRouteVisible(false);
+    }
+    unawaited(loadResumePoint());
+    unawaited(selectEpisode(initialIndex));
+  }
+
+  /// 原地替换首页 feed 队列；频道变化时重置到第 1 个，刷新时尽量保留当前剧。
+  void updateFeed(List<Drama> dramas, {String? keepDramaId}) {
+    final currentId = currentDramaId;
+    final nextQueue = PlaybackQueue.home(List<Drama>.unmodifiable(dramas));
+    final nextVisible = List<int>.generate(nextQueue.length, (index) => index);
+    final nextEpisodes = [for (final entry in nextQueue.entries) entry.episode];
+    feedDramas = List<Drama>.unmodifiable(dramas);
+    queue = nextQueue;
+    visibleIndices = nextVisible;
+    if (dramas.isNotEmpty) pageDrama = dramas.first;
+    if (!_started) return;
+    if (nextQueue.length == 0) {
+      session.setRouteVisible(false);
+      notify();
+      return;
+    }
+    final keepIndex = keepDramaId != null && keepDramaId == currentId
+        ? nextQueue.entries.indexWhere((entry) => entry.drama.id == keepDramaId)
+        : -1;
+    if (keepIndex >= 0 && session.active != null) {
+      sessionEpisodes
+        ..clear()
+        ..addAll(nextEpisodes);
+      session.remapCurrentIndex(
+        keepIndex,
+        preloadIndex: nextVisibleIndex(keepIndex),
+      );
+      _jumpToFeedPage(keepIndex);
+      notify();
+      return;
+    }
+    _replaceSession(nextEpisodes, keepIndex >= 0 ? keepIndex : 0);
+  }
+
+  PlaybackSession _createSession(
+    PlayerFactory factory,
+    PlaybackCoordinator coordinator,
+  ) {
+    return PlaybackSession(
       episodes: sessionEpisodes,
       factory: factory,
       // 地址只由后端下发（票据或详情里的免费集签名地址），拿不到地址即视为锁定
@@ -162,11 +220,35 @@ class PlayerLogic extends ChangeNotifier {
       activate: activatePlayer,
       coordinator: coordinator,
     );
-    if (!active || visibleIndices.isEmpty) {
-      session.setRouteVisible(false);
+  }
+
+  void _replaceSession(List<Episode> nextEpisodes, int targetIndex) {
+    final factory = _sessionFactory;
+    final coordinator = _sessionCoordinator;
+    if (factory == null || coordinator == null) return;
+    unawaited(saveCurrentProgress());
+    final previous = session;
+    sessionEpisodes = List<Episode>.of(nextEpisodes);
+    trackedPlayer = null;
+    trackedEpisode = null;
+    trackedDrama = null;
+    session = _createSession(factory, coordinator);
+    session.setRouteVisible(active && visibleIndices.isNotEmpty);
+    unawaited(previous.close());
+    _jumpToFeedPage(targetIndex);
+    unawaited(selectEpisode(targetIndex));
+    notify();
+  }
+
+  void _jumpToFeedPage(int index) {
+    if (!_started) return;
+    if (pages.hasClients) {
+      pages.jumpToPage(index);
+      return;
     }
-    unawaited(loadResumePoint());
-    unawaited(selectEpisode(initialIndex));
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (pages.hasClients) pages.jumpToPage(index);
+    });
   }
 
   /// 服务端续看位置：进播放页时取一次，用于"定位到上次那一集的那一秒"。