refactor(empty-state): 空状态支持内容居中

lib/core/widgets/empty_state.dart

@@ -5,12 +5,12 @@ import 'package:flutter/material.dart';
 import '../theme/app_colors.dart';
 import '../theme/app_dimens.dart';
 
-const double _regularIconSize = 72;
+const double _iconSize = 72;
-const double _compactIconSize = 44;
 const double _maxContentWidth = 260;
 const double _regularHorizontal = 24;
 const double _regularVertical = 28;
-const double _compactPad = 16;
+const double _compactHorizontal = 16;
+const double _compactVertical = 4;
 const double _regularGap = 20;
 const double _compactGap = 12;
 const double _actionMinHeight = 44;
@@ -27,6 +27,7 @@ class EmptyState extends StatelessWidget {
     this.onAction,
     this.footer,
     this.compact = false,
+    this.stretchContent = false,
   });
 
   final IconData icon;
@@ -38,6 +39,9 @@ class EmptyState extends StatelessWidget {
   final Widget? footer;
   final bool compact;
 
+  /// 让图标和文案占满内容宽度，适用于需要严格居中的宽版空状态。
+  final bool stretchContent;
+
   @override
   Widget build(BuildContext context) {
     final hasAction = actionLabel != null && onAction != null;
@@ -48,49 +52,53 @@ class EmptyState extends StatelessWidget {
         child: Padding(
           key: const Key('empty-state-padding'),
           padding: EdgeInsets.symmetric(
-            horizontal: compact ? _compactPad : _regularHorizontal,
+            horizontal: compact ? _compactHorizontal : _regularHorizontal,
-            vertical: compact ? _compactPad : _regularVertical,
+            vertical: compact ? _compactVertical : _regularVertical,
           ),
+          child: SizedBox(
+            width: stretchContent ? double.infinity : null,
             child: Semantics(
               container: true,
               label: title,
               child: Column(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                ExcludeSemantics(
+                  ExcludeSemantics(child: _EmptyMark(icon: icon)),
-                  child: _EmptyMark(icon: icon, compact: compact),
-                ),
                   SizedBox(height: compact ? _compactGap : _regularGap),
-                _EmptyCopy(
+                  SizedBox(
+                    width: stretchContent ? double.infinity : null,
+                    child: _EmptyCopy(
                       title: title,
                       subtitle: subtitle,
                       actionLabel: hasAction ? actionLabel : null,
                       actionKey: actionKey,
                       onAction: hasAction ? onAction : null,
                       footer: footer,
+                      stretchContent: stretchContent,
+                    ),
                   ),
                 ],
               ),
             ),
           ),
         ),
+      ),
     );
   }
 }
 
 /// 空列表只放一枚大图标，不画线框，也不铺底色。
 class _EmptyMark extends StatelessWidget {
-  const _EmptyMark({required this.icon, required this.compact});
+  const _EmptyMark({required this.icon});
 
   final IconData icon;
-  final bool compact;
 
   @override
   Widget build(BuildContext context) {
     return Icon(
       icon,
       key: const Key('empty-state-icon'),
-      size: compact ? _compactIconSize : _regularIconSize,
+      size: _iconSize,
       color: AppColors.subtle,
     );
   }
@@ -104,6 +112,7 @@ class _EmptyCopy extends StatelessWidget {
     required this.actionKey,
     required this.onAction,
     required this.footer,
+    required this.stretchContent,
   });
 
   final String title;
@@ -112,11 +121,15 @@ class _EmptyCopy extends StatelessWidget {
   final Key? actionKey;
   final VoidCallback? onAction;
   final Widget? footer;
+  final bool stretchContent;
 
   @override
   Widget build(BuildContext context) {
     return Column(
       mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: stretchContent
+          ? CrossAxisAlignment.stretch
+          : CrossAxisAlignment.center,
       children: [
         ExcludeSemantics(
           child: Text(

lib/pages/discover/discover_view.dart

@@ -297,6 +297,7 @@ class _DiscoverPageState extends State<DiscoverPage> {
               icon: Icons.movie_filter_outlined,
               title: l10n.noStories,
               subtitle: l10n.emptyHint,
+              stretchContent: true,
             ),
           ),
         )

lib/pages/favorites/favorites_page.dart

@@ -38,7 +38,6 @@ const double _synopsisFontSize = 12;
 const double _synopsisLineHeight = 1.15;
 const double _synopsisGap = 4;
 const int _maxTags = 2;
-const double _emptyListHeight = 360;
 const double _loadMoreThreshold = 240;
 
 final RegExp _tagSplitter = RegExp(r'[,/、·]');
@@ -124,11 +123,8 @@ class _FavoritesBody extends StatelessWidget {
       );
     }
     if (favorites.error != null && favorites.cards.isEmpty) {
-      return _refreshable(
+      return _refreshableState(
         favorites,
-        children: [
-          SizedBox(
-            height: _emptyListHeight,
         child: EmptyState(
           key: const Key('favorites-error'),
           icon: Icons.cloud_off_rounded,
@@ -136,25 +132,20 @@ class _FavoritesBody extends StatelessWidget {
           actionLabel: l10n.retry,
           actionKey: const Key('favorites-retry'),
           onAction: () => unawaited(favorites.load()),
+          stretchContent: true,
         ),
-          ),
-        ],
       );
     }
     if (favorites.cards.isEmpty) {
-      return _refreshable(
+      return _refreshableState(
         favorites,
-        children: [
-          SizedBox(
-            height: _emptyListHeight,
         child: EmptyState(
           key: const Key('favorites-empty'),
           icon: Icons.star_border_rounded,
           title: l10n.noFavorites,
           subtitle: l10n.emptyHint,
+          stretchContent: true,
         ),
-          ),
-        ],
       );
     }
     return _refreshable(
@@ -205,6 +196,20 @@ class _FavoritesBody extends StatelessWidget {
     );
   }
 
+  Widget _refreshableState(
+    FavoriteController favorites, {
+    required Widget child,
+  }) {
+    return AppPullToRefresh(
+      onRefresh: favorites.load,
+      child: CustomScrollView(
+        key: const Key('favorites-empty-scroll'),
+        physics: AppPullToRefresh.physics,
+        slivers: [SliverFillRemaining(hasScrollBody: false, child: child)],
+      ),
+    );
+  }
+
   bool _onScroll(ScrollNotification notification) {
     if (notification.depth != 0) return false;
     final reachedBottom =

lib/pages/recommend/recommend_page.dart

@@ -348,6 +348,7 @@ class _RecommendPageState extends State<RecommendPage>
         key: const Key('recommend-feed-empty'),
         icon: Icons.movie_outlined,
         title: l10n.noStories,
+        stretchContent: true,
       ),
     );
   }

lib/pages/watch_records/watch_records_page.dart

@@ -26,7 +26,6 @@ import 'widgets/watch_record_card.dart';
 
 const double _pageHorizontal = 14;
 const double _statsFontSize = 12;
-const double _emptyListHeight = 360;
 const double _loadMoreThreshold = 240;
 
 /// 独立观看记录页。
@@ -113,31 +112,22 @@ class _WatchRecordsBodyState extends State<_WatchRecordsBody> {
       );
     }
     if (controller.error != null && controller.records.isEmpty) {
-      return _refreshable(
+      return _refreshableState(
-        children: [
-          SizedBox(
-            height: _emptyListHeight,
         child: _FailureState(
           message: errorText(l10n, controller.error, l10n.progressError),
           onRetry: controller.load,
         ),
-          ),
-        ],
       );
     }
     if (controller.records.isEmpty) {
-      return _refreshable(
+      return _refreshableState(
-        children: [
-          SizedBox(
-            height: _emptyListHeight,
         child: EmptyState(
           key: const Key('watch-records-empty'),
           icon: Icons.history_rounded,
           title: l10n.noWatchRecords,
           subtitle: l10n.emptyHint,
+          stretchContent: true,
         ),
-          ),
-        ],
       );
     }
     return _refreshable(
@@ -184,6 +174,17 @@ class _WatchRecordsBodyState extends State<_WatchRecordsBody> {
     );
   }
 
+  Widget _refreshableState({required Widget child}) {
+    return AppPullToRefresh(
+      onRefresh: controller.load,
+      child: CustomScrollView(
+        key: const Key('watch-records-empty-scroll'),
+        physics: AppPullToRefresh.physics,
+        slivers: [SliverFillRemaining(hasScrollBody: false, child: child)],
+      ),
+    );
+  }
+
   bool _onScroll(ScrollNotification notification) {
     if (notification.depth != 0) return false;
     final reachedBottom =
@@ -303,6 +304,7 @@ class _FailureState extends StatelessWidget {
       actionLabel: l10n.retry,
       actionKey: const Key('watch-records-retry'),
       onAction: () => unawaited(onRetry()),
+      stretchContent: true,
     );
   }
 }

test/empty_state/empty_state_test.dart

@@ -69,7 +69,7 @@ void main() {
     semantics.dispose();
   });
 
-  testWidgets('should_render_compact_dimensions_for_embedded_empty_state', (
+  testWidgets('should_keep_standard_icon_size_in_compact_empty_state', (
     tester,
   ) async {
     await _pump(
@@ -83,7 +83,7 @@ void main() {
 
     expect(
       tester.getSize(find.byKey(const Key('empty-state-icon'))),
-      const Size(44, 44),
+      const Size(72, 72),
     );
     expect(find.byType(DecoratedBox), findsNothing);
     expect(
@@ -97,7 +97,7 @@ void main() {
       tester
           .widget<Padding>(find.byKey(const Key('empty-state-padding')))
           .padding,
-      const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
+      const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
     );
     expect(find.byKey(const Key('empty-state-action')), findsNothing);
   });

test/library/favorites_page_test.dart

@@ -174,6 +174,14 @@ void main() {
 
     expect(find.byKey(const Key('favorites-empty')), findsOneWidget);
     expect(find.byType(EmptyState), findsOneWidget);
+    final viewport = tester.getRect(
+      find.byKey(const Key('favorites-empty-scroll')),
+    );
+    final content = tester.getRect(
+      find.byKey(const Key('empty-state-content')),
+    );
+    expect(content.center.dx, closeTo(viewport.center.dx, 0.1));
+    expect(content.center.dy, closeTo(viewport.center.dy, 0.1));
   });
 
   testWidgets('should_show_retry_when_favorite_list_fails', (tester) async {

test/watch/watch_records_page_test.dart

@@ -209,6 +209,27 @@ void main() {
     expect(find.text('The Signal'), findsOneWidget);
   });
 
+  testWidgets('should_center_empty_state_in_remaining_page_space', (
+    tester,
+  ) async {
+    final auth = await _auth(signedIn: true);
+    await _pumpPage(
+      tester,
+      auth: auth,
+      history: CountingWatchHistory(const []),
+      catalog: FakeCatalogRepository(),
+    );
+
+    final viewport = tester.getRect(
+      find.byKey(const Key('watch-records-empty-scroll')),
+    );
+    final content = tester.getRect(
+      find.byKey(const Key('empty-state-content')),
+    );
+    expect(content.center.dx, closeTo(viewport.center.dx, 0.1));
+    expect(content.center.dy, closeTo(viewport.center.dy, 0.1));
+  });
+
   testWidgets('should_remove_and_clear_device_history_when_signed_out', (
     tester,
   ) async {