feat(flutter): 播放页长按手势与加速态

lib/pages/player/player_view.dart

@@ -36,6 +36,8 @@ import '../../core/data/repositories/playback_repository.dart';
 
 part 'player_view_actions.dart';
 
+const double _boostPlaybackSpeed = 2.0;
+
 class PlayerPage extends StatefulWidget {
   const PlayerPage({
     super.key,
@@ -82,6 +84,9 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
   late final PlayerLogic logic;
   bool _chromeVisible = true;
   double _playbackSpeed = 1.0;
+  bool _boosting = false;
+  double? _speedBeforeBoost;
+  bool? _chromeBeforeBoost;
 
   /// 收藏切换后的本地增量：基准是详情快照，切换成功按服务端状态 ±1。
   final Map<String, int> _favoriteDelta = {};
@@ -130,6 +135,34 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
     setState(() => _chromeVisible = false);
   }
 
+  /// 长按两侧：切 2 倍速并清屏，记下进入前的状态用于松手恢复。
+  void _startBoost() {
+    if (_boosting) return;
+    setState(() {
+      _boosting = true;
+      _speedBeforeBoost = _playbackSpeed;
+      _chromeBeforeBoost = _chromeVisible;
+      _playbackSpeed = _boostPlaybackSpeed;
+      _chromeVisible = false;
+    });
+    unawaited(logic.setPlaybackSpeed(_boostPlaybackSpeed));
+  }
+
+  /// 松手或手势取消：恢复长按前的倍速与清屏状态。
+  void _endBoost() {
+    if (!_boosting) return;
+    final speed = _speedBeforeBoost ?? _playbackSpeed;
+    final chrome = _chromeBeforeBoost ?? true;
+    setState(() {
+      _boosting = false;
+      _speedBeforeBoost = null;
+      _chromeBeforeBoost = null;
+      _playbackSpeed = speed;
+      _chromeVisible = chrome;
+    });
+    unawaited(logic.setPlaybackSpeed(speed));
+  }
+
   /// 收藏状态确认后同步右侧计数（总数没有独立计数接口，按 ±1 跟随）。
   void _applyFavoriteDelta(String dramaId, {required bool nowSaved}) {
     setState(() {
@@ -397,6 +430,7 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
               playing: logic.session.userWantsPlay,
               playbackSpeed: _playbackSpeed,
               totalEpisodes: logic.visibleIndices.length,
+              boosting: _boosting,
             ),
             actions: PlayerOverlayActions(
               onBack: widget.embedded
@@ -419,6 +453,9 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
               onSeek: ready
                   ? (position) => logic.seekTo(context, videoPort!, position)
                   : null,
+              onLongPressCenter: () => _openMore(context, episode),
+              onBoostStart: _startBoost,
+              onBoostEnd: _endBoost,
             ),
             controlsVisible: _chromeVisible,
           ),