feat(flutter): 播放页长按手势与加速态

lib/pages/player/widgets/player_overlay.dart

@@ -16,6 +16,8 @@ const double _topButtonSize = 36;
 const double _topBarHeight = 58;
 const double _railButtonSize = 34;
 const double _railGap = 18;
+const double _boostHintIconSize = 16;
+const double _boostHintFontSize = 13;
 const List<Shadow> _playerTextShadows = [
   Shadow(color: Colors.black54, blurRadius: 5, offset: Offset(0, 1)),
 ];
@@ -45,10 +47,16 @@ class PlayerPlaybackOverlay extends StatelessWidget {
       child: Stack(
         children: [
           Positioned.fill(
-            child: GestureDetector(
-              key: const Key('player-video-tap'),
-              behavior: HitTestBehavior.opaque,
-              onTap: actions.onTogglePlay,
+            child: LayoutBuilder(
+              builder: (context, constraints) => GestureDetector(
+                key: const Key('player-video-tap'),
+                behavior: HitTestBehavior.opaque,
+                onTap: actions.onTogglePlay,
+                onLongPressStart: (details) =>
+                    _handleLongPressStart(details, constraints.maxWidth),
+                onLongPressEnd: (_) => actions.onBoostEnd(),
+                onLongPressCancel: actions.onBoostEnd,
+              ),
             ),
           ),
           _top(context),
@@ -120,6 +128,17 @@ class PlayerPlaybackOverlay extends StatelessWidget {
     );
   }
 
+  /// 长按分区：中间 1/3 弹更多，左右各 1/3 开始加速。
+  void _handleLongPressStart(LongPressStartDetails details, double width) {
+    final third = width / 3;
+    final dx = details.localPosition.dx;
+    if (dx < third || dx > width - third) {
+      actions.onBoostStart();
+      return;
+    }
+    actions.onLongPressCenter();
+  }
+
   Widget _rail(BuildContext context) {
     final compact = MediaQuery.sizeOf(context).height < 700;
     return Positioned(
@@ -149,6 +168,7 @@ class PlayerPlaybackOverlay extends StatelessWidget {
         mainAxisSize: MainAxisSize.min,
         children: [
           if (controlsVisible) _bottomInfo(context),
+          if (data.boosting) _boostHint(),
           _bottomProgress(),
           _bottomActions(),
         ],
@@ -156,6 +176,35 @@ class PlayerPlaybackOverlay extends StatelessWidget {
     );
   }
 
+  /// 加速提示：橙色小三角 + 当前倍速文案，悬在进度条上方。
+  Widget _boostHint() {
+    return Padding(
+      key: const Key('player-speed-boost-hint'),
+      padding: const EdgeInsets.only(bottom: 6),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          const Icon(
+            Icons.play_arrow_rounded,
+            color: AppColors.blue,
+            size: _boostHintIconSize,
+            shadows: _playerTextShadows,
+          ),
+          const SizedBox(width: 4),
+          Text(
+            data.l10n.speedBoosting(data.playbackSpeed.toStringAsFixed(1)),
+            style: const TextStyle(
+              color: AppColors.blue,
+              fontSize: _boostHintFontSize,
+              fontWeight: FontWeight.w700,
+              shadows: _playerTextShadows,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
   Widget _bottomInfo(BuildContext context) {
     final series = localizedDramaTitle(data.l10n, data.drama);
     final synopsis = localizedDramaSynopsis(data.l10n, data.drama);

lib/pages/player/widgets/player_overlay_models.dart

@@ -22,6 +22,7 @@ class PlayerOverlayData {
     required this.playing,
     required this.playbackSpeed,
     required this.totalEpisodes,
+    required this.boosting,
     this.authorNote = '',
   });
 
@@ -61,6 +62,9 @@ class PlayerOverlayData {
   /// 可见集数量。
   final int totalEpisodes;
 
+  /// 是否处于长按加速态。
+  final bool boosting;
+
   /// 作者声明；没有后端字段时为空。
   final String authorNote;
 }
@@ -83,6 +87,9 @@ class PlayerOverlayActions {
     required this.onMore,
     required this.onScrubStart,
     required this.onSeek,
+    required this.onLongPressCenter,
+    required this.onBoostStart,
+    required this.onBoostEnd,
   });
 
   /// 返回上一页。
@@ -126,4 +133,13 @@ class PlayerOverlayActions {
 
   /// 提交进度跳转。
   final Future<void> Function(Duration)? onSeek;
+
+  /// 长按画面中间：弹出更多面板。
+  final VoidCallback onLongPressCenter;
+
+  /// 长按画面两侧：开始加速。
+  final VoidCallback onBoostStart;
+
+  /// 长按结束或取消：结束加速。
+  final VoidCallback onBoostEnd;
 }