feat: 逻辑与页面布局分离

lib/pages/drama_detail/drama_detail_logic.dart

@@ -1,19 +1,47 @@
+import 'package:flutter/material.dart';
+
 import '../../core/data/models/drama.dart';
 import '../../core/data/repositories/watch_history_repository.dart';
+import '../player/player_view.dart';
 
-class DramaDetailLogic {
+class DramaDetailLogic extends ChangeNotifier {
   DramaDetailLogic({required this.drama, required this.history});
 
   final Drama drama;
   final WatchHistoryRepository history;
   int? continueIndex;
+  bool _disposed = false;
+
+  void notify() {
+    if (!_disposed) notifyListeners();
+  }
 
   Future<void> loadContinue() async {
-    final id = await history.lastEpisodeId(demoProfileId, drama.id);
-    if (id == null) return;
-    final index = drama.episodes.indexWhere((episode) => episode.id == id);
-    if (index >= 0 && drama.episodes[index].isFree) {
-      continueIndex = index;
+    try {
+      final id = await history.lastEpisodeId(demoProfileId, drama.id);
+      if (id == null || _disposed) return;
+      final index = drama.episodes.indexWhere((episode) => episode.id == id);
+      if (index >= 0 && drama.episodes[index].isFree) {
+        continueIndex = index;
+        notify();
+      }
+    } catch (_) {
+      // Keep the first episode available if preferences cannot be read.
     }
   }
+
+  Future<void> openPlayer(BuildContext context, int index) async {
+    await Navigator.of(context).push(
+      MaterialPageRoute<void>(
+        builder: (_) => PlayerPage(drama: drama, initialIndex: index),
+      ),
+    );
+    await loadContinue();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
 }

lib/pages/drama_detail/drama_detail_view.dart

@@ -3,7 +3,6 @@ import 'package:flutter/material.dart';
 import '../../core/data/models/drama.dart';
 import '../../core/formatting/localized_content.dart';
 import '../../l10n/app_localizations.dart';
-import '../player/player_view.dart';
 import 'drama_detail_binding.dart';
 import 'drama_detail_logic.dart';
 
@@ -22,29 +21,24 @@ class _DramaDetailPageState extends State<DramaDetailPage> {
   void initState() {
     super.initState();
     logic = DramaDetailBinding().create(drama: widget.drama);
-    _loadContinue();
+    logic.loadContinue();
   }
 
-  Future<void> _loadContinue() async {
-    try {
-      await logic.loadContinue();
-      if (mounted) setState(() {});
-    } catch (_) {
-      // Keep the first episode available if preferences cannot be read.
-    }
-  }
-
-  Future<void> _openPlayer(BuildContext context, int index) async {
-    await Navigator.of(context).push(
-      MaterialPageRoute<void>(
-        builder: (_) => PlayerPage(drama: logic.drama, initialIndex: index),
-      ),
-    );
-    await _loadContinue();
+  @override
+  void dispose() {
+    logic.dispose();
+    super.dispose();
   }
 
   @override
   Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: logic,
+      builder: (context, _) => _page(context),
+    );
+  }
+
+  Widget _page(BuildContext context) {
     final l10n = AppLocalizations.of(context)!;
     final drama = logic.drama;
     return Scaffold(
@@ -87,7 +81,8 @@ class _DramaDetailPageState extends State<DramaDetailPage> {
                 ),
                 const SizedBox(height: 20),
                 FilledButton.icon(
-                  onPressed: () => _openPlayer(context, logic.continueIndex ?? 0),
+                  onPressed: () =>
+                      logic.openPlayer(context, logic.continueIndex ?? 0),
                   icon: const Icon(Icons.play_arrow_rounded),
                   label: Text(
                     logic.continueIndex == null
@@ -124,7 +119,7 @@ class _DramaDetailPageState extends State<DramaDetailPage> {
                     title: Text(l10n.episodeLabel(episode.number)),
                     subtitle: Text(l10n.freeTestMedia),
                     trailing: const Icon(Icons.play_circle_outline_rounded),
-                    onTap: () => _openPlayer(context, index),
+                    onTap: () => logic.openPlayer(context, index),
                   ),
                 );
               },