generated from dellevin/template
502 lines
16 KiB
Dart
502 lines
16 KiB
Dart
import 'dart:async';
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import 'dart:io';
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import 'dart:ui';
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import 'package:battery_plus/battery_plus.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_inappwebview/flutter_inappwebview.dart';
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import 'package:provider/provider.dart';
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import 'package:url_launcher/url_launcher.dart';
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import 'package:wakelock_plus/wakelock_plus.dart';
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import '../../models/reader_book.dart';
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import '../../providers/app_provider.dart';
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import '../../service/book_server.dart';
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import '../../utils/reader/book_file_helper.dart';
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import '../../utils/reader/coordinates_to_part.dart';
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import '../../utils/reader/reader_url_generator.dart';
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/// 目录条目
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class TocItem {
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final String href;
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final String title;
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final int level;
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TocItem({required this.href, required this.title, this.level = 1});
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factory TocItem.fromJson(Map<String, dynamic> json) {
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return TocItem(
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href: json['href'] ?? '',
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title: json['label'] ?? json['title'] ?? '',
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level: json['level'] as int? ?? 1,
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);
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}
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}
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/// 递归展平嵌套目录
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List<TocItem> _flattenToc(List<dynamic> items, [int level = 1]) {
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final result = <TocItem>[];
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for (final item in items) {
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if (item is Map) {
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final map = Map<String, dynamic>.from(item);
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result.add(TocItem(
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href: map['href'] ?? '',
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title: map['label'] ?? map['title'] ?? '',
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level: level,
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));
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if (map['subitems'] is List && (map['subitems'] as List).isNotEmpty) {
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result.addAll(_flattenToc(map['subitems'] as List, level + 1));
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}
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}
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}
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return result;
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}
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/// 翻页区域动作
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enum PageTurnAction { prev, next, menu, none }
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/// 默认九宫格布局（中间菜单，左右翻页）
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const List<PageTurnAction> _defaultZoneActions = [
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PageTurnAction.prev, PageTurnAction.menu, PageTurnAction.next,
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PageTurnAction.prev, PageTurnAction.menu, PageTurnAction.next,
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PageTurnAction.prev, PageTurnAction.menu, PageTurnAction.next,
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];
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/// 核心电子书阅读组件 — 使用 InAppWebView 渲染 foliate-js 阅读器
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class EpubPlayer extends StatefulWidget {
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final ReaderBook book;
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final String? initialCfi;
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final VoidCallback showOrHideToolbar;
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final ValueChanged<List<TocItem>>? onTocReady;
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const EpubPlayer({
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super.key,
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required this.book,
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this.initialCfi,
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required this.showOrHideToolbar,
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this.onTocReady,
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});
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@override
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State<EpubPlayer> createState() => EpubPlayerState();
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}
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class EpubPlayerState extends State<EpubPlayer> {
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late InAppWebViewController _controller;
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String cfi = '';
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double percentage = 0.0;
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String chapterTitle = '';
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String chapterHref = '';
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int chapterCurrentPage = 0;
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int chapterTotalPages = 0;
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// 浏览历史
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bool _showHistory = false;
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bool _canGoBack = false;
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bool _canGoForward = false;
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// 滚轮翻页
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Timer? _scrollDebounceTimer;
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double _accumulatedScrollDelta = 0;
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static const double _scrollThreshold = 50.0;
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InAppWebViewSettings get _settings => InAppWebViewSettings(
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supportZoom: false,
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transparentBackground: true,
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isInspectable: kDebugMode,
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useHybridComposition: true,
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mixedContentMode: MixedContentMode.MIXED_CONTENT_ALWAYS_ALLOW,
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);
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// ─── 翻页方法 ───────────────────────────────────────
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void prevPage() {
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_controller.evaluateJavascript(source: 'prevPage()');
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}
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void nextPage() {
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_controller.evaluateJavascript(source: 'nextPage()');
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}
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void prevChapter() {
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_controller.evaluateJavascript(source: 'prevSection()');
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}
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void nextChapter() {
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_controller.evaluateJavascript(source: 'nextSection()');
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}
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void goToPercentage(double value) {
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_controller.evaluateJavascript(source: 'goToPercent($value)');
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}
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void goToHref(String href) {
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_controller.evaluateJavascript(source: "goToHref('$href')");
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}
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void goToCfi(String cfi) {
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_controller.evaluateJavascript(source: "goToCfi('$cfi')");
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}
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// ─── 历史导航 ───────────────────────────────────────
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void backHistory() {
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_controller.evaluateJavascript(source: 'back()');
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}
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void forwardHistory() {
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_controller.evaluateJavascript(source: 'forward()');
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}
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// ─── 保存进度 ───────────────────────────────────────
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Future<void> saveReadingProgress() async {
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if (cfi.isEmpty) return;
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final provider = context.read<AppProvider>();
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final updated = widget.book.copyWith(
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lastReadCfi: cfi,
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readingPercentage: percentage,
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updatedAt: DateTime.now(),
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);
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await provider.updateReaderBook(updated);
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}
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// ─── 翻页区域处理 ──────────────────────────────────
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void _onClick(Map<String, dynamic> location) {
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final x = (location['x'] as num).toDouble();
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final y = (location['y'] as num).toDouble();
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final part = coordinatesToPart(x, y);
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final action = _defaultZoneActions[part];
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switch (action) {
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case PageTurnAction.prev:
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prevPage();
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break;
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case PageTurnAction.next:
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nextPage();
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break;
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case PageTurnAction.menu:
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widget.showOrHideToolbar();
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break;
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case PageTurnAction.none:
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break;
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}
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}
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// ─── 滚轮翻页 ──────────────────────────────────────
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Future<void> _handlePointerEvents(PointerEvent event) async {
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if (event is! PointerScrollEvent) return;
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_accumulatedScrollDelta += event.scrollDelta.dy;
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_scrollDebounceTimer?.cancel();
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_scrollDebounceTimer = Timer(const Duration(milliseconds: 80), () {
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if (_accumulatedScrollDelta.abs() >= _scrollThreshold) {
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if (_accumulatedScrollDelta > 0) {
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nextPage();
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} else {
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prevPage();
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}
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}
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_accumulatedScrollDelta = 0;
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});
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}
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// ─── 外部链接处理 ──────────────────────────────────
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Future<void> _handleExternalLink(dynamic rawLink) async {
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String? link;
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if (rawLink is String && rawLink.trim().isNotEmpty) {
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link = rawLink.trim();
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} else if (rawLink is Map && rawLink['href'] is String) {
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link = (rawLink['href'] as String).trim();
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}
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if (!mounted || link == null || link.isEmpty) return;
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final uri = Uri.tryParse(link);
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if (uri == null || uri.scheme.isEmpty || uri.scheme == 'javascript') return;
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final shouldOpen = await showDialog<bool>(
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context: context,
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builder: (ctx) => AlertDialog(
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title: const Text('打开外部链接'),
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content: Column(
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mainAxisSize: MainAxisSize.min,
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text('是否在浏览器中打开以下链接？'),
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const SizedBox(height: 8),
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SelectableText(link!, style: const TextStyle(fontSize: 13)),
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],
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),
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actions: [
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TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('取消')),
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TextButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('打开')),
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],
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),
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);
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if (shouldOpen == true) {
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await launchUrl(uri, mode: LaunchMode.externalApplication);
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}
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}
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// ─── WebView 回调 ───────────────────────────────────
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Future<void> _onWebViewCreated(InAppWebViewController controller) async {
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if (Platform.isAndroid) {
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await InAppWebViewController.setWebContentsDebuggingEnabled(true);
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}
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_controller = controller;
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_setHandlers(controller);
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WakelockPlus.enable();
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}
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void _setHandlers(InAppWebViewController controller) {
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controller.addJavaScriptHandler(
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handlerName: 'onLoadEnd',
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callback: (args) {},
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);
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controller.addJavaScriptHandler(
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handlerName: 'onRelocated',
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callback: (args) {
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final location = args[0] as Map<String, dynamic>;
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if (cfi == location['cfi']) return;
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setState(() {
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cfi = location['cfi'] ?? '';
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percentage = double.tryParse(location['percentage']?.toString() ?? '0') ?? 0.0;
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chapterTitle = location['chapterTitle'] ?? '';
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chapterHref = location['chapterHref'] ?? '';
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chapterCurrentPage = location['chapterCurrentPage'] ?? 0;
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chapterTotalPages = location['chapterTotalPages'] ?? 0;
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});
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saveReadingProgress();
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},
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);
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controller.addJavaScriptHandler(
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handlerName: 'onClick',
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callback: (args) {
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final location = args[0] as Map<String, dynamic>;
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_onClick(location);
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},
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);
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controller.addJavaScriptHandler(
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handlerName: 'onExternalLink',
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callback: (args) async {
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await _handleExternalLink(args.isNotEmpty ? args.first : null);
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},
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);
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controller.addJavaScriptHandler(
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handlerName: 'onSetToc',
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callback: (args) {
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final List<dynamic> rawToc = args[0];
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final toc = _flattenToc(rawToc);
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widget.onTocReady?.call(toc);
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},
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);
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// 以下 handler 保留注册以避免 JS 端报错，但不做处理
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controller.addJavaScriptHandler(handlerName: 'onSelectionEnd', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'onSelectionCleared', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'onAnnotationClick', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'onSearch', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'renderAnnotations', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'onImageClick', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'onFootnoteClose', callback: (args) {});
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controller.addJavaScriptHandler(handlerName: 'handleBookmark', callback: (args) {});
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controller.addJavaScriptHandler(
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handlerName: 'onPushState',
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callback: (args) {
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final state = args[0] as Map<String, dynamic>;
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if (!mounted) return;
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setState(() {
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_canGoBack = state['canGoBack'] ?? false;
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_canGoForward = state['canGoForward'] ?? false;
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_showHistory = _canGoBack || _canGoForward;
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});
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},
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);
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controller.addJavaScriptHandler(
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handlerName: 'onPullUp',
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callback: (args) {
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widget.showOrHideToolbar();
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},
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);
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}
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@override
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void dispose() {
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_scrollDebounceTimer?.cancel();
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saveReadingProgress();
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WakelockPlus.disable();
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super.dispose();
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}
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// ─── 阅读信息浮层 ──────────────────────────────────
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Widget _buildReadingInfo() {
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if (chapterCurrentPage == 0 && percentage == 0.0) {
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return const SizedBox.shrink();
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}
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final isDark = Theme.of(context).brightness == Brightness.dark;
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final infoColor = isDark ? Colors.white.withAlpha(130) : Colors.black.withAlpha(130);
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final infoStyle = TextStyle(color: infoColor, fontSize: 10);
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return IgnorePointer(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Padding(
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padding: const EdgeInsets.only(top: 50, left: 16, right: 16),
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child: Text(
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chapterTitle.isNotEmpty ? chapterTitle : widget.book.title,
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style: infoStyle,
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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),
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),
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const Spacer(),
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Padding(
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padding: const EdgeInsets.only(bottom: 24, left: 16, right: 16),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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Text('$chapterCurrentPage/$chapterTotalPages', style: infoStyle),
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Text('${(percentage * 100).toStringAsFixed(1)}%', style: infoStyle),
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_buildBatteryWidget(infoColor),
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_buildClockWidget(infoStyle),
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],
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),
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),
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],
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),
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);
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}
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Widget _buildBatteryWidget(Color color) {
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return FutureBuilder<int>(
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future: Battery().batteryLevel,
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builder: (context, snapshot) {
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if (!snapshot.hasData) return const SizedBox.shrink();
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return Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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Icon(Icons.battery_std, size: 12, color: color),
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const SizedBox(width: 2),
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Text('${snapshot.data}%', style: TextStyle(color: color, fontSize: 10)),
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],
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);
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},
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);
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}
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Widget _buildClockWidget(TextStyle style) {
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return StreamBuilder<DateTime>(
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stream: Stream.periodic(const Duration(seconds: 30), (_) => DateTime.now()),
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builder: (context, snapshot) {
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final now = snapshot.data ?? DateTime.now();
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return Text(
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'${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}',
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style: style,
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);
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},
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);
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}
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// ─── 历史导航胶囊 ──────────────────────────────────
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Widget _buildHistoryCapsule() {
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final colors = Theme.of(context).colorScheme;
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final buttonStyle = TextButton.styleFrom(
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minimumSize: const Size(0, 32),
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tapTargetSize: MaterialTapTargetSize.shrinkWrap,
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padding: const EdgeInsets.symmetric(horizontal: 16),
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(32)),
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);
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Widget btn(IconData icon, String label, VoidCallback onPressed) {
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return TextButton.icon(
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icon: Icon(icon, size: 18, color: colors.onSurface.withAlpha(180)),
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label: Text(label, style: TextStyle(color: colors.onSurface.withAlpha(180), fontSize: 14)),
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onPressed: onPressed,
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style: buttonStyle,
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);
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}
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final buttons = <Widget>[];
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if (_canGoBack) buttons.add(btn(Icons.arrow_back, '返回', backHistory));
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buttons.add(btn(Icons.close, '关闭', () => setState(() => _showHistory = false)));
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if (_canGoForward) buttons.add(btn(Icons.arrow_forward, '前进', forwardHistory));
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return Align(
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alignment: Alignment.bottomCenter,
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child: Padding(
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padding: const EdgeInsets.only(bottom: 40),
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child: ClipRRect(
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borderRadius: BorderRadius.circular(32),
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child: BackdropFilter(
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filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
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child: Container(
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height: 32,
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decoration: BoxDecoration(
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color: colors.surfaceContainer.withAlpha(123),
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borderRadius: BorderRadius.circular(32),
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border: Border.all(color: colors.outline, width: 0.5),
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),
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child: Row(mainAxisSize: MainAxisSize.min, children: buttons),
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),
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),
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),
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),
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);
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}
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@override
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Widget build(BuildContext context) {
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final fileAbsolute = BookFileHelper.instance.resolveAbsolutePath(widget.book.filePath);
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final bookUrl = 'http://127.0.0.1:${Server().port}/book/${Uri.encodeComponent(fileAbsolute)}';
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final initialCfi = widget.initialCfi ?? widget.book.lastReadCfi;
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final url = generateReaderUrl(
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fileUrl: bookUrl,
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cfi: initialCfi,
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backgroundColor: 'FFFBFBF3',
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textColor: 'FF343434',
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);
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return Listener(
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onPointerSignal: _handlePointerEvents,
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child: Scaffold(
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resizeToAvoidBottomInset: false,
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body: Stack(
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children: [
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SizedBox.expand(
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child: InAppWebView(
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initialUrlRequest: URLRequest(url: WebUri(url)),
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initialSettings: _settings,
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onWebViewCreated: _onWebViewCreated,
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onReceivedError: (controller, request, error) {
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debugPrint('[EpubPlayer] WebView error: ${error.description}');
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},
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onConsoleMessage: (controller, msg) {
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debugPrint('[EpubPlayer] JS: ${msg.message}');
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},
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),
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),
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_buildReadingInfo(),
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if (_showHistory) _buildHistoryCapsule(),
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],
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),
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),
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);
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}
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}
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