import 'dart:async'; import 'dart:convert'; import 'package:flutter/material.dart'; import 'package:flutter/services.dart'; import 'package:url_launcher/url_launcher.dart'; import '../../utils/database_helper.dart'; import '../../utils/epub/epub_theme.dart'; import '../../utils/epub/epub_webview_handler.dart'; import '../../utils/epub/epub_stream_service.dart'; import '../../utils/epub/epub_parser.dart'; import '../../utils/epub/reader_settings.dart'; import '../../utils/epub/reader_models.dart'; import '../../utils/epub/reader_dao.dart'; import '../../utils/toast_util.dart'; import 'book_session.dart'; import 'reader_renderer.dart'; import 'reader_webview.dart'; import 'control_panel.dart'; import 'toc_drawer.dart'; import 'image_viewer.dart'; import 'footnote_popup.dart'; import 'search_sheet.dart'; import 'epub_selection_toolbar.dart'; import 'selection_handles.dart'; part 'mixins/spine_navigation_mixin.dart'; part 'mixins/page_navigation_mixin.dart'; part 'mixins/progress_mixin.dart'; part 'mixins/theme_mixin.dart'; part 'mixins/link_handling_mixin.dart'; part 'mixins/image_viewer_mixin.dart'; part 'mixins/footnote_mixin.dart'; part 'mixins/text_selection_mixin.dart'; /// Reads EPUB directly from compressed file without extraction. class ReaderScreen extends StatefulWidget { final String bookId; final String filePath; final String title; final String? coverPath; final Map? bookData; final int? initialSpineIndex; final String? scrollToXPath; final String? scrollToText; const ReaderScreen({ super.key, required this.bookId, required this.filePath, required this.title, this.coverPath, this.bookData, this.initialSpineIndex, this.scrollToXPath, this.scrollToText, }); @override State createState() => _ReaderScreenState(); } class _ReaderScreenState extends State with WidgetsBindingObserver, _SpineNavigationMixin, _PageNavigationMixin, _ProgressMixin, _ThemeMixin, _LinkHandlingMixin, _ImageViewerMixin, _FootnoteMixin, _TextSelectionMixin { @override late final EpubWebViewHandler webViewHandler; @override late final BookSession bookSession; @override final ReaderRendererController rendererController = ReaderRendererController(); // Core UI state @override bool isWebViewLoading = true; @override bool showControls = false; // WebView visibility control for smoother transitions Animation? routeAnimation; bool shouldShowWebView = false; // Spine navigation state (used by _SpineNavigationMixin) @override int currentSpineItemIndex = 0; // Pagination state (used by _PageNavigationMixin) @override int currentPageInChapter = 0; @override int totalPagesInChapter = 1; // Progress state (used by _ProgressMixin) @override String displayProgress = ''; @override Timer? progressDebouncer; final Map _chapterPageCounts = {}; @override Map get chapterPageCounts => _chapterPageCounts; // Theme state (used by _ThemeMixin) @override ThemeData? currentTheme; @override bool updatingTheme = false; @override Timer? themeUpdateDebouncer; @override ReaderSettings readerSettings = const ReaderSettings(); // Image viewer state (used by _ImageViewerMixin) @override bool isImageViewerVisible = false; @override Uint8List? currentImageData; @override Rect? currentImageRect; // Footnote state (used by _FootnoteMixin) @override OverlayEntry? footnoteOverlayEntry; @override final GlobalKey footnoteKey = GlobalKey(); @override bool isClosingFootnote = false; final GlobalKey scaffoldKey = GlobalKey(); bool tocDrawerOpen = false; bool styleDrawerOpen = false; AppLifecycleState? lastLifecycleState = AppLifecycleState.resumed; // 书签 final List> _bookmarks = []; // Services final EpubStreamService _streamService = EpubStreamService(); @override final ReaderDao _readerDao = ReaderDao(); final EpubParser _epubParser = EpubParser(); @override void initState() { super.initState(); webViewHandler = EpubWebViewHandler(streamService: _streamService); // Create a placeholder BookSession; epubInfo will be replaced after parsing. bookSession = BookSession( fileHash: widget.bookId, bookData: widget.bookData ?? { 'id': widget.bookId, 'file_path': widget.filePath, 'cover_path': widget.coverPath, 'last_read_cfi': '', }, epubInfo: EpubBookInfo( title: widget.title, author: '', authors: [], opfRootPath: '', epubVersion: '', spine: [], toc: [], ), readerDao: _readerDao, ); // Load settings first, then book ReaderSettings.load().then((settings) { readerSettings = settings; _pendingScrollXPath = widget.scrollToXPath; _pendingScrollText = widget.scrollToText; if (mounted) { setupVolumeControl(); _loadBook(); } }); WidgetsBinding.instance.addObserver(this); WidgetsBinding.instance.addPostFrameCallback((_) { final route = ModalRoute.of(context); if (route != null && route.animation != null) { routeAnimation = route.animation!; routeAnimation?.addStatusListener(handleRouteAnimationStatus); } else { shouldShowWebView = true; } }); hideBottomNavigationBar(); } @override void dispose() { WidgetsBinding.instance.removeObserver(this); routeAnimation?.removeStatusListener(handleRouteAnimationStatus); routeAnimation = null; themeUpdateDebouncer?.cancel(); progressDebouncer?.cancel(); removeFootnoteOverlay(animate: false); restoreSystemUI(); bookSession.flushProgress( currentChapterIndex: currentSpineItemIndex, currentPageInChapter: currentPageInChapter, totalPagesInChapter: totalPagesInChapter, ); bookSession.dispose(); _streamService.dispose(); super.dispose(); } @override void didChangeAppLifecycleState(AppLifecycleState state) { if (state == AppLifecycleState.paused || state == AppLifecycleState.inactive || state == AppLifecycleState.detached) { saveProgress(); } lastLifecycleState = state; setupVolumeControl(); } void setupVolumeControl() { // VolumeControlService removed — native implementation never existed. // TODO: reimplement if native volume-key interception is added. } void hideBottomNavigationBar() { SystemChrome.setEnabledSystemUIMode( SystemUiMode.manual, overlays: [SystemUiOverlay.top], ); } void restoreSystemUI() { SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge); } @override void didChangeDependencies() { super.didChangeDependencies(); if (currentTheme == null) { currentTheme = Theme.of(context); } else if (currentTheme?.colorScheme != Theme.of(context).colorScheme) { currentTheme = Theme.of(context); updateWebViewThemeWithDebounce(); } } void handleRouteAnimationStatus(AnimationStatus status) { if (status == AnimationStatus.completed) { setState(() { shouldShowWebView = true; }); routeAnimation?.removeStatusListener(handleRouteAnimationStatus); routeAnimation = null; } } /// Load book data from EPUB file and initialize session. Future _loadBook() async { try { // filePath is the original absolute path from import final fullEpubPath = widget.filePath; // Parse EPUB metadata using existing EpubParser final epubInfo = await _epubParser.parseFromFile( fullEpubPath, fileName: widget.title, ); if (epubInfo == null) { if (mounted) { ScaffoldMessenger.of(context).showSnackBar( const SnackBar(content: Text('EPUB 解析失败')), ); Navigator.of(context).pop(); } return; } // Open archive in stream service for WebView resource serving await _streamService.openBook(fullEpubPath); // Update session with parsed data bookSession.updateEpubInfo(epubInfo); bookSession.load(); if (mounted) { setState(() { currentSpineItemIndex = widget.initialSpineIndex ?? bookSession.initialChapterIndex; }); updateProgressDebounced(); _loadBookmarks(); } } catch (e) { if (mounted) { ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text('加载书籍失败: $e')), ); Navigator.of(context).pop(); } } } // ─── 书签 ────────────────────────────────────────────────────── Future _loadBookmarks() async { final list = await _readerDao.getBookmarksByBookId(widget.bookId); if (mounted) setState(() => _bookmarks..clear()..addAll(list)); } bool get _currentPageHasBookmark { final cfi = '$currentSpineItemIndex:${(currentPageInChapter / (totalPagesInChapter > 0 ? totalPagesInChapter : 1)).toStringAsFixed(4)}'; return _bookmarks.any((bm) => (bm['cfi'] as String? ?? '') == cfi); } Future _toggleBookmark() async { // 检查当前页是否已有书签 final cfi = '$currentSpineItemIndex:${(currentPageInChapter / (totalPagesInChapter > 0 ? totalPagesInChapter : 1)).toStringAsFixed(4)}'; final existing = _bookmarks.where((bm) => (bm['cfi'] as String? ?? '') == cfi).firstOrNull; if (existing != null) { // 删除已有书签 await _readerDao.deleteBookmark(existing['id'] as int); if (mounted) ToastUtil.show(context, '已移除书签'); } else { // 添加书签 // 尝试从 TOC 找更友好的标题 String title = ''; for (final toc in bookSession.toc) { if (toc.spineIndex == currentSpineItemIndex) { title = toc.label; break; } } // 如果 TOC 没有标题（或者标题是原始文件路径），用页内文字内容 if (title.isEmpty || title.contains('.htm') || title.contains('.xhtml')) { title = await _getPageTextPreview(); if (title.isEmpty) { title = '第${currentSpineItemIndex + 1}章'; } } await _readerDao.insertBookmark({ 'book_id': widget.bookId, 'content': title, 'cfi': cfi, 'chapter': currentSpineItemIndex.toString(), 'created_at': DateTime.now().toIso8601String(), 'updated_at': DateTime.now().toIso8601String(), }); if (mounted) ToastUtil.show(context, '已添加书签'); } await _loadBookmarks(); } /// 获取当前页的文字预览（前 20 个字符） Future _getPageTextPreview() async { try { final result = await rendererController.webViewController?.runJavaScriptReturningResult( "(function(){var f=document.getElementById('frame-curr');if(!f||!f.contentDocument)return '';var t=f.contentDocument.body.textContent||'';return t.trim().substring(0,20)})();" ); if (result != null) { final s = result.toString(); return (s.startsWith('"') && s.endsWith('"') && s.length >= 2 ? s.substring(1, s.length - 1) : s).trim(); } } catch (_) {} return ''; } void _jumpToBookmark(Map bookmark) { final cfi = bookmark['cfi'] as String? ?? ''; if (cfi.isEmpty) return; final parts = cfi.split(':'); if (parts.isEmpty) return; final chapterIndex = int.tryParse(parts[0]) ?? 0; final scrollRatio = parts.length >= 2 ? (double.tryParse(parts[1]) ?? 0.0) : 0.0; if (chapterIndex >= 0 && chapterIndex < bookSession.spine.length) { setState(() { currentSpineItemIndex = chapterIndex; }); loadCarousel(restoreScrollRatio: scrollRatio); } } Future _deleteBookmark(int id) async { await _readerDao.deleteBookmark(id); await _loadBookmarks(); } void toggleControls() { if (showControls) { hideBottomNavigationBar(); } else { restoreSystemUI(); } setState(() { showControls = !showControls; }); } void openDrawer() { scaffoldKey.currentState?.openDrawer(); } void _openSearch() { showModalBottomSheet( context: context, isScrollControlled: true, backgroundColor: Colors.transparent, builder: (ctx) => SearchSheet( bookSession: bookSession, streamService: _streamService, onNavigate: (spineIndex, keyword, scrollRatio) { Navigator.pop(ctx); if (spineIndex >= 0 && spineIndex < bookSession.spine.length) { setState(() => currentSpineItemIndex = spineIndex); loadCarousel(restoreScrollRatio: scrollRatio); } else if (mounted) { ToastUtil.show(context, '章节位置无效'); } }, ), ); } @override Widget build(BuildContext context) { if (!bookSession.isLoaded) { return Scaffold( backgroundColor: Theme.of(context).colorScheme.surface, body: const SizedBox.shrink(), ); } final epubTheme = getEpubTheme(); final isDark = epubTheme.isDark; final colorScheme = epubTheme.colorScheme; final themeData = Theme.of(context); final overlayStyle = isDark ? SystemUiOverlayStyle.light.copyWith( statusBarColor: Colors.transparent, systemNavigationBarColor: colorScheme.surface, systemNavigationBarIconBrightness: Brightness.light, ) : SystemUiOverlayStyle.dark.copyWith( statusBarColor: Colors.transparent, systemNavigationBarColor: colorScheme.surface, systemNavigationBarIconBrightness: Brightness.dark, ); final activeItems = resolveActiveItems(); final activateTocTitle = activeItems.isNotEmpty ? activeItems.last.label : widget.title; return PopScope( canPop: footnoteOverlayEntry == null, onPopInvokedWithResult: (didPop, result) { if (didPop) return; if (footnoteOverlayEntry != null) { removeFootnoteOverlay(); return; } // 和 lumina 一样：先保存，再 pop saveProgress(); Navigator.of(context).pop(); }, child: AnnotatedRegion( value: overlayStyle, child: Stack( children: [ Scaffold( key: scaffoldKey, backgroundColor: colorScheme.surfaceContainer, drawer: TocDrawer( bookTitle: widget.title, coverPath: widget.coverPath, totalChapters: bookSession.spine.length, toc: bookSession.toc, activeTocItems: activeItems, currentSpineIndex: currentSpineItemIndex >= 0 && currentSpineItemIndex < bookSession.spine.length ? bookSession.spine[currentSpineItemIndex].index : -1, onTocItemSelected: navigateToTocItem, onCoverTap: navigateToFirstTocItemFirstPage, themeData: themeData, bookmarks: _bookmarks, onBookmarkTap: _jumpToBookmark, onBookmarkDelete: _deleteBookmark, ), onDrawerChanged: (isOpened) { tocDrawerOpen = isOpened; setupVolumeControl(); }, body: Container( color: epubTheme.surfaceColor, child: Stack( children: [ ReaderRenderer( controller: rendererController, bookSession: bookSession, webViewHandler: webViewHandler, fileHash: widget.bookId, showControls: showControls, isLoading: isWebViewLoading || updatingTheme, canPerformPageTurn: canPerformPageTurn, onPerformPageTurn: handlePageTurn, onToggleControls: toggleControls, onInitialized: () async { // 从详情页跳转时不恢复滚动位置 final ratio = widget.initialSpineIndex != null ? null : bookSession.initialScrollPosition; await loadCarousel(restoreScrollRatio: ratio); }, onPageCountReady: (totalPages) async { setState(() { totalPagesInChapter = totalPages; if (currentPageInChapter >= totalPagesInChapter) { currentPageInChapter = totalPagesInChapter - 1; } }); updateProgressDebounced(); }, onPageChanged: (pageIndex) { setState(() { currentPageInChapter = pageIndex; }); updateProgressDebounced(); saveProgress(); }, onScrollAnchors: handleScrollAnchors, onImageLongPress: handleImageLongPress, onFootnoteTap: handleFootnoteTap, onLinkTap: handleLinkTap, shouldHandleLinkTap: shouldHandleLinkTap, onTextSelection: handleTextSelection, shouldShowWebView: shouldShowWebView, initializeTheme: epubTheme, statusBarLeftContent: activateTocTitle, statusBarRightContent: displayProgress, pageAnimation: readerSettings.pageAnimation, ), ControlPanel( showControls: showControls, title: bookSession.spine.isEmpty ? widget.title : activateTocTitle, currentSpineItemIndex: currentSpineItemIndex, totalSpineItems: bookSession.spine.length, currentPageInChapter: currentPageInChapter, totalPagesInChapter: totalPagesInChapter, direction: bookSession.direction, fontSize: readerSettings.zoom * 18.0, zoom: readerSettings.zoom, marginTop: readerSettings.marginTop, marginBottom: readerSettings.marginBottom, marginLeft: readerSettings.marginLeft, marginRight: readerSettings.marginRight, onBack: () { saveProgress(); Navigator.of(context).pop(); }, onOpenDrawer: openDrawer, onPreviousPage: () => rendererController.performPreviousPageTurn(), onFirstPage: () => goToPage(0), onNextPage: () => rendererController.performNextPageTurn(), onLastPage: () => goToPage(totalPagesInChapter - 1), onPreviousChapter: previousSpineItemFirstPage, onNextChapter: nextSpineItem, onToggleStyleDrawer: () { // Style sheet is opened internally by ControlPanel }, onZoomChanged: (value) { setState(() { readerSettings = readerSettings.copyWith(zoom: value); }); readerSettings.save(); updateWebViewTheme(); }, onFontSizeChanged: (value) { // 将字号值映射为 zoom（12px→0.7, 18px→1.0, 32px→1.8） final zoom = value / 18.0; setState(() { readerSettings = readerSettings.copyWith(zoom: zoom); }); readerSettings.save(); updateWebViewTheme(); }, onMarginTopChanged: (value) { setState(() { readerSettings = readerSettings.copyWith(marginTop: value); }); readerSettings.save(); updateWebViewTheme(); }, onMarginBottomChanged: (value) { setState(() { readerSettings = readerSettings.copyWith(marginBottom: value); }); readerSettings.save(); updateWebViewTheme(); }, onMarginLeftChanged: (value) { setState(() { readerSettings = readerSettings.copyWith(marginLeft: value); }); readerSettings.save(); updateWebViewTheme(); }, onMarginRightChanged: (value) { setState(() { readerSettings = readerSettings.copyWith(marginRight: value); }); readerSettings.save(); updateWebViewTheme(); }, themeIndex: readerSettings.themeIndex, customBgColor: readerSettings.customBgColor, customTextColor: readerSettings.customTextColor, onThemeIndexChanged: (index) { setState(() { readerSettings = readerSettings.copyWith(themeIndex: index); }); readerSettings.save(); updateWebViewTheme(); }, onCustomColorChanged: (bgColor, textColor) { setState(() { readerSettings = readerSettings.copyWith( customBgColor: bgColor, customTextColor: textColor, ); }); readerSettings.save(); updateWebViewTheme(); }, currentPageHasBookmark: _currentPageHasBookmark, onBookmarkToggle: _toggleBookmark, onSearchTap: _openSearch, ), ], ), ), ), Positioned.fill( child: IgnorePointer( ignoring: !isImageViewerVisible, child: AnimatedOpacity( duration: const Duration(milliseconds: 250), curve: Curves.easeOut, opacity: isImageViewerVisible ? 1.0 : 0.0, child: (currentImageData != null && currentImageRect != null) ? ImageViewer( imageData: currentImageData!, onClose: closeImageViewer, sourceRect: currentImageRect!, colorScheme: colorScheme, ) : const SizedBox.shrink(), ), ), ), // 文本选中工具条 if (isSelectionToolbarVisible) EpubSelectionToolbar( selectionRect: _selectionRect!, onCopy: _onCopyButton, onHighlight: _onHighlightButton, onExcerpt: _onExcerptButton, onDismiss: _dismissSelectionToolbar, ), // 选区手柄（起点和终点） if (isSelectionToolbarVisible) SelectionHandles( startPosition: _startHandle, endPosition: _endHandle, onDragStart: onDragStartHandle, onDragEnd: onDragEndHandle, ), ], ), ), ); } }