feat(app): 完善播放协议搜索与空状态

lib/pages/recommend/recommend_page.dart

@@ -25,12 +25,18 @@ class RecommendPage extends StatefulWidget {
     required this.feedController,
     required this.active,
     required this.onSearch,
+    this.videoOnly = false,
+    this.onImmersiveChanged,
   });
 
   final HomeFeedController feedController;
   final bool active;
   final VoidCallback onSearch;
 
+  /// 画中画时只留视频，不画顶栏。
+  final bool videoOnly;
+  final ValueChanged<bool>? onImmersiveChanged;
+
   @override
   State<RecommendPage> createState() => _RecommendPageState();
 }
@@ -84,40 +90,42 @@ class _RecommendPageState extends State<RecommendPage> {
               ),
             ),
           ),
-          Positioned(
-            top: 0,
-            left: 0,
-            right: 0,
-            child: IgnorePointer(
-              child: SizedBox(
-                height: 72,
-                child: DecoratedBox(
-                  key: const Key('recommend-top-gradient'),
-                  decoration: const BoxDecoration(
-                    gradient: LinearGradient(
-                      begin: Alignment.topCenter,
-                      end: Alignment.bottomCenter,
-                      colors: [AppColors.mediaBlack, AppColors.transparent],
+          if (!widget.videoOnly)
+            Positioned(
+              top: 0,
+              left: 0,
+              right: 0,
+              child: IgnorePointer(
+                child: SizedBox(
+                  height: 72,
+                  child: DecoratedBox(
+                    key: const Key('recommend-top-gradient'),
+                    decoration: const BoxDecoration(
+                      gradient: LinearGradient(
+                        begin: Alignment.topCenter,
+                        end: Alignment.bottomCenter,
+                        colors: [AppColors.mediaBlack, AppColors.transparent],
+                      ),
                     ),
                   ),
                 ),
               ),
             ),
-          ),
-          Positioned(
-            top: 0,
-            left: 0,
-            right: 0,
-            child: SafeArea(
-              bottom: false,
-              child: RecommendTopNav(
-                selected: _tab,
-                onVideo: _tab == RecommendInnerTab.feed,
-                onSelected: _selectTab,
-                onSearch: _handleSearch,
+          if (!widget.videoOnly)
+            Positioned(
+              top: 0,
+              left: 0,
+              right: 0,
+              child: SafeArea(
+                bottom: false,
+                child: RecommendTopNav(
+                  selected: _tab,
+                  onVideo: _tab == RecommendInnerTab.feed,
+                  onSelected: _selectTab,
+                  onSearch: _handleSearch,
+                ),
               ),
             ),
-          ),
         ],
       ),
     );
@@ -155,6 +163,7 @@ class _RecommendPageState extends State<RecommendPage> {
           _openDrama(drama, episodeId: episode.id),
       onRefreshFeed: widget.feedController.refreshCurrent,
       onLoadMore: widget.feedController.loadMore,
+      onImmersiveChanged: widget.onImmersiveChanged,
       scrubCancelRequest: _scrubCancelRequest,
     );
   }