generated from dellevin/template
233 lines
10 KiB
Dart
233 lines
10 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import '../../models/data_models.dart';
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import '../../providers/app_provider.dart';
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import '../../utils/user_prefs.dart';
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import '../../widgets/book_status_bar.dart';
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import '../../widgets/book_list_item.dart';
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import '../../widgets/animated_star_rating.dart';
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import '../../widgets/shimmer_skeleton.dart';
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import '../../widgets/fade_in_local_image.dart';
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/// 阅读标签页（分页 + 触底加载）
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class BookTabPage extends StatefulWidget {
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const BookTabPage({super.key});
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@override
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State<BookTabPage> createState() => _BookTabPageState();
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}
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class _BookTabPageState extends State<BookTabPage> {
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int _layoutStyle = 0;
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final List<Book> _items = [];
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bool _hasMore = true;
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bool _isLoading = false;
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int _offset = 0;
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int _lastStatusIndex = -1;
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bool _initialized = false;
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late ScrollController _scrollController;
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AppProvider? _provider;
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int _lastScrollSignal = 0;
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int _prevBookCount = -1;
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static const _statusMap = {0: 'read', 1: 'reading', 2: 'want_to_read'};
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@override
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void initState() {
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super.initState();
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_layoutStyle = UserPrefs().bookLayoutStyle;
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_scrollController = ScrollController()..addListener(_onScroll);
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WidgetsBinding.instance.addPostFrameCallback((_) {
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final provider = context.read<AppProvider>();
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_provider = provider;
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provider.addListener(_onDataChanged);
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_loadFirst();
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});
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}
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@override
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void dispose() {
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_provider?.removeListener(_onDataChanged);
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_scrollController.dispose();
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super.dispose();
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}
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void _onDataChanged() {
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if (!_initialized || !mounted) return;
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final provider = context.read<AppProvider>();
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// 检查回到顶部信号
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if (provider.scrollToTopSignal != _lastScrollSignal && provider.scrollToTopSignal > 0) {
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_lastScrollSignal = provider.scrollToTopSignal;
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if (_scrollController.hasClients) {
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_scrollController.animateTo(0, duration: const Duration(milliseconds: 300), curve: Curves.easeOut);
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}
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}
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// 仅在数据实际变化时刷新列表，避免底部导航栏显隐等UI变化误触发重载
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final statusChanged = provider.bookStatusIndex != _lastStatusIndex;
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final countChanged = provider.books.length != _prevBookCount;
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if (statusChanged || countChanged) {
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_prevBookCount = provider.books.length;
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_loadFirst();
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}
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}
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void _onScroll() {
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if (_scrollController.position.pixels >= _scrollController.position.maxScrollExtent - 200) {
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_loadMore();
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}
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}
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Future<void> _loadFirst() async {
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final provider = context.read<AppProvider>();
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final statusIdx = provider.bookStatusIndex;
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_lastStatusIndex = statusIdx;
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_initialized = true;
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final status = _statusMap[statusIdx] ?? 'read';
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setState(() { _isLoading = true; _offset = 0; _hasMore = true; });
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final list = await provider.loadBooksPaged(status: status, offset: 0, sortMode: UserPrefs().bookSortMode);
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if (!mounted) return;
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setState(() { _items.clear(); _items.addAll(list); _offset = list.length; _hasMore = list.length >= 20; _isLoading = false; });
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}
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Future<void> _loadMore() async {
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if (_isLoading || !_hasMore) return;
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setState(() => _isLoading = true);
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final provider = context.read<AppProvider>();
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final status = _statusMap[provider.bookStatusIndex] ?? 'read';
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final list = await provider.loadBooksPaged(status: status, offset: _offset, sortMode: UserPrefs().bookSortMode);
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if (!mounted) return;
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setState(() { _items.addAll(list); _offset += list.length; _hasMore = list.length >= 20; _isLoading = false; });
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}
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Future<void> _refresh() async {
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await context.read<AppProvider>().loadBooks();
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await _loadFirst();
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}
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@override
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Widget build(BuildContext context) {
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return Column(children: [
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const BookStatusBar(),
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Expanded(child: _buildBody(context)),
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]);
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}
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Widget _buildBody(BuildContext context) {
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final colors = Theme.of(context).colorScheme;
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return Consumer<AppProvider>(builder: (context, provider, _) {
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if (_initialized && provider.bookStatusIndex != _lastStatusIndex) {
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_lastStatusIndex = provider.bookStatusIndex;
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WidgetsBinding.instance.addPostFrameCallback((_) => _loadFirst());
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}
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if (_items.isEmpty && _isLoading) return _buildSkeleton();
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if (_items.isEmpty) {
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return RefreshIndicator(onRefresh: _refresh, color: colors.primary, backgroundColor: colors.surface,
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child: ListView(physics: const AlwaysScrollableScrollPhysics(), children: [_buildEmptyState(context, provider.bookStatusIndex)]));
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}
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return RefreshIndicator(onRefresh: _refresh, color: colors.primary, backgroundColor: colors.surface,
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child: _layoutStyle == 1 ? _buildListView() : _buildGridView());
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});
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}
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Widget _buildGridView() {
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return GridView.builder(controller: _scrollController,
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padding: const EdgeInsets.fromLTRB(16, 16, 16, 100),
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gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3, childAspectRatio: 0.55, crossAxisSpacing: 12, mainAxisSpacing: 16),
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itemCount: _items.length + (_hasMore ? 1 : 0),
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itemBuilder: (context, index) {
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if (index >= _items.length) return _buildLoadMore();
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return BookListItem(book: _items[index]);
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},
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);
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}
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Widget _buildListView() {
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return ListView.builder(controller: _scrollController,
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padding: const EdgeInsets.fromLTRB(12, 8, 12, 100),
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itemCount: _items.length + (_hasMore ? 1 : 0),
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itemBuilder: (context, index) {
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if (index >= _items.length) return _buildLoadMore();
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return _buildListCard(_items[index]);
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},
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);
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}
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Widget _buildLoadMore() {
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return Padding(padding: const EdgeInsets.symmetric(vertical: 20),
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child: Center(child: _isLoading
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? SizedBox(width: 20, height: 20, child: CircularProgressIndicator(strokeWidth: 2, color: Theme.of(context).colorScheme.primary))
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: Text('没有更多了', style: TextStyle(fontSize: 12, color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.3)))),
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);
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}
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Widget _buildListCard(Book book) {
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final colors = Theme.of(context).colorScheme;
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return GestureDetector(
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onTap: () => Navigator.pushNamed(context, '/book-detail', arguments: book),
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onLongPress: () => _showDeleteDialog(context, book),
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child: Container(margin: const EdgeInsets.only(bottom: 8), padding: const EdgeInsets.all(12),
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decoration: BoxDecoration(color: colors.surfaceContainerHigh, borderRadius: BorderRadius.circular(12)),
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child: Row(children: [
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Container(width: 48, height: 64,
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decoration: BoxDecoration(color: colors.outlineVariant, borderRadius: BorderRadius.circular(6)),
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clipBehavior: Clip.antiAlias,
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child: book.coverPath != null && book.coverPath!.isNotEmpty
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? FadeInLocalImage(path: book.coverPath, fit: BoxFit.cover,
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errorWidget: Icon(Icons.menu_book_outlined, size: 22, color: colors.onSurface.withValues(alpha: 0.25)))
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: Icon(Icons.menu_book_outlined, size: 22, color: colors.onSurface.withValues(alpha: 0.25)),
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),
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const SizedBox(width: 12),
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Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
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Text(book.title, maxLines: 1, overflow: TextOverflow.ellipsis,
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style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: colors.onSurface)),
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if (book.authors.isNotEmpty) ...[const SizedBox(height: 3),
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Text(book.authors.take(2).join('、'), maxLines: 1, overflow: TextOverflow.ellipsis,
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style: TextStyle(fontSize: 12, color: colors.onSurface.withValues(alpha: 0.35))),
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],
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const SizedBox(height: 6),
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if (book.rating != null) AnimatedStarRating(rating: book.rating!, starSize: 12, showNumber: true)
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else const SizedBox(height: 14),
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])),
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const SizedBox(width: 8),
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Icon(Icons.chevron_right, color: colors.onSurface.withValues(alpha: 0.2), size: 20),
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]),
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),
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);
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}
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void _showDeleteDialog(BuildContext context, Book book) {
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final colors = Theme.of(context).colorScheme;
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showDialog(context: context, builder: (ctx) => AlertDialog(
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backgroundColor: colors.surface, elevation: 0, shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
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title: Text('确认删除', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: colors.onSurface)),
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content: Text('确定要删除《${book.title}》吗？删除后可在回收站恢复。',
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style: TextStyle(fontSize: 14, color: colors.onSurface.withValues(alpha: 0.6), height: 1.5)),
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actions: [
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TextButton(onPressed: () => Navigator.pop(ctx), child: Text('取消', style: TextStyle(color: colors.onSurface.withValues(alpha: 0.6)))),
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ElevatedButton(onPressed: () async { await context.read<AppProvider>().removeBook(book.id); Navigator.pop(ctx); _loadFirst(); },
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style: ElevatedButton.styleFrom(backgroundColor: colors.error, foregroundColor: colors.onError, elevation: 0,
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)), padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8)),
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child: const Text('删除'),
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),
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],
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actionsPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
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));
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}
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Widget _buildSkeleton() => _layoutStyle == 1 ? const MovieSkeletonGrid() : const BookSkeletonGrid();
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Widget _buildEmptyState(BuildContext context, int statusIndex) {
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final colors = Theme.of(context).colorScheme;
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final statusText = ['已读', '在读', '想读'][statusIndex];
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return Center(child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
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Container(width: 80, height: 80,
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decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(20)),
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child: Icon(Icons.menu_book_outlined, size: 40, color: colors.onSurface.withValues(alpha: 0.25))),
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const SizedBox(height: 20),
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Text('暂无$statusText的书籍', style: TextStyle(fontSize: 16, color: colors.onSurface.withValues(alpha: 0.4))),
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]));
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}
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}
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