generated from dellevin/template
387 lines
13 KiB
Dart
387 lines
13 KiB
Dart
import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:xml/xml.dart';
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import '../../services/epub/epub_stream_service.dart';
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import 'book_session.dart';
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class SearchSheet extends StatefulWidget {
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final BookSession bookSession;
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final EpubStreamService streamService;
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final void Function(int spineIndex, String keyword, double scrollRatio) onNavigate;
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const SearchSheet({
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super.key,
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required this.bookSession,
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required this.streamService,
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required this.onNavigate,
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});
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@override
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State<SearchSheet> createState() => _SearchSheetState();
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}
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class _SearchSheetState extends State<SearchSheet> {
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final TextEditingController _controller = TextEditingController();
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final ScrollController _scrollController = ScrollController();
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List<_SearchResult> _allResults = [];
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List<_SearchResult> _displayResults = [];
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bool _searching = false;
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bool _searched = false;
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bool _loadingMore = false;
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String _currentQuery = '';
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static const int _pageSize = 20;
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@override
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void initState() {
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super.initState();
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_scrollController.addListener(_onScroll);
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}
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@override
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void dispose() {
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_controller.dispose();
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_scrollController.dispose();
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super.dispose();
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}
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void _onScroll() {
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if (_scrollController.position.pixels >=
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_scrollController.position.maxScrollExtent - 50 &&
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!_loadingMore &&
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_displayResults.length < _allResults.length) {
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_loadMore();
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}
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}
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void _loadMore() {
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if (_loadingMore) return;
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setState(() => _loadingMore = true);
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Future.delayed(const Duration(milliseconds: 100), () {
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if (!mounted) return;
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final nextBatch = _allResults
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.skip(_displayResults.length)
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.take(_pageSize)
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.toList();
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setState(() {
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_displayResults.addAll(nextBatch);
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_loadingMore = false;
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});
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});
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}
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Future<void> _performSearch(String query) async {
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if (query.trim().isEmpty) return;
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// 收起键盘
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FocusScope.of(context).unfocus();
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setState(() {
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_searching = true;
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_searched = true;
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_currentQuery = query;
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});
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final results = <_SearchResult>[];
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final spine = widget.bookSession.spine;
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for (int i = 0; i < spine.length; i++) {
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final href = spine[i].href;
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try {
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final bytes = await widget.streamService.readFileFromEpub(
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targetFilePath: href,
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);
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if (bytes == null) continue;
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final text = _extractBodyText(bytes);
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if (text.isEmpty) continue;
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final lowerText = text.toLowerCase();
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final lowerQuery = query.toLowerCase();
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int startIndex = 0;
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while (true) {
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final idx = lowerText.indexOf(lowerQuery, startIndex);
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if (idx == -1) break;
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final start = (idx - 40).clamp(0, text.length);
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final end = (idx + query.length + 40).clamp(0, text.length);
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final contextStr = text.substring(start, end);
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results.add(_SearchResult(
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chapterIndex: i,
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chapterTitle: _getChapterTitle(i),
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context: contextStr,
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matchIndex: idx,
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scrollRatio: idx / text.length,
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));
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startIndex = idx + query.length;
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}
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} catch (_) {}
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}
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if (mounted) {
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setState(() {
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_allResults = results;
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_displayResults = results.take(_pageSize).toList();
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_searching = false;
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});
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}
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}
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String _extractBodyText(List<int> bytes) {
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try {
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final content = utf8.decode(bytes, allowMalformed: true);
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final doc = XmlDocument.parse(content);
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// 只提取 <body> 内容
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final body = doc.findAllElements('body').firstOrNull;
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if (body == null) return '';
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final buffer = StringBuffer();
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_extractTextFromBody(body, buffer);
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return buffer.toString().replaceAll(RegExp(r'\s+'), ' ').trim();
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} catch (_) {
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return '';
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}
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}
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void _extractTextFromBody(XmlNode node, StringBuffer buffer) {
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// 跳过 script、style、svg 等非内容标签
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if (node is XmlElement) {
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final name = node.name.local.toLowerCase();
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if (name == 'script' || name == 'style' || name == 'svg' ||
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name == 'head' || name == 'nav') {
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return;
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}
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}
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if (node is XmlText) {
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buffer.write(node.value);
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}
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for (final child in node.children) {
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_extractTextFromBody(child, buffer);
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}
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}
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String _getChapterTitle(int index) {
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final toc = widget.bookSession.toc;
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for (final entry in toc) {
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if (entry.spineIndex == index) return entry.label;
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}
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return '第${index + 1}章';
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}
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List<TextSpan> _buildHighlightedText(String text, String query, ColorScheme colors) {
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if (query.isEmpty) {
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return [TextSpan(text: text, style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.7)))];
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}
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final spans = <TextSpan>[];
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final lowerText = text.toLowerCase();
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final lowerQuery = query.toLowerCase();
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int lastEnd = 0;
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int idx = lowerText.indexOf(lowerQuery);
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while (idx != -1) {
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if (idx > lastEnd) {
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spans.add(TextSpan(
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text: text.substring(lastEnd, idx),
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style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.7)),
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));
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}
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spans.add(TextSpan(
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text: text.substring(idx, idx + query.length),
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style: TextStyle(
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fontSize: 13,
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color: colors.error,
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fontWeight: FontWeight.w600,
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),
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));
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lastEnd = idx + query.length;
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idx = lowerText.indexOf(lowerQuery, lastEnd);
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}
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if (lastEnd < text.length) {
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spans.add(TextSpan(
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text: text.substring(lastEnd),
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style: TextStyle(fontSize: 13, color: colors.onSurface.withValues(alpha: 0.7)),
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));
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}
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return spans;
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}
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@override
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Widget build(BuildContext context) {
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final colors = Theme.of(context).colorScheme;
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final bottomPadding = MediaQuery.of(context).padding.bottom;
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return Container(
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height: MediaQuery.of(context).size.height * 0.75,
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decoration: BoxDecoration(
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color: colors.surface,
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borderRadius: const BorderRadius.vertical(top: Radius.circular(16)),
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),
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child: Column(
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children: [
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// 拖拽条
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Container(
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width: 36, height: 4,
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margin: const EdgeInsets.only(top: 12, bottom: 8),
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decoration: BoxDecoration(
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color: colors.onSurface.withValues(alpha: 0.15),
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borderRadius: BorderRadius.circular(2),
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),
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),
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// 搜索框
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Padding(
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padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
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child: Row(
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children: [
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Expanded(
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child: TextField(
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controller: _controller,
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autofocus: true,
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textInputAction: TextInputAction.search,
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onSubmitted: _performSearch,
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decoration: InputDecoration(
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hintText: '搜索书籍内容...',
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hintStyle: TextStyle(
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fontSize: 14,
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color: colors.onSurface.withValues(alpha: 0.35),
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),
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prefixIcon: Icon(Icons.search,
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size: 20, color: colors.onSurface.withValues(alpha: 0.4)),
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filled: true,
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fillColor: colors.surfaceContainerHighest,
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contentPadding: const EdgeInsets.symmetric(
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horizontal: 12, vertical: 10),
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border: OutlineInputBorder(
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borderRadius: BorderRadius.circular(10),
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borderSide: BorderSide.none,
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),
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enabledBorder: OutlineInputBorder(
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borderRadius: BorderRadius.circular(10),
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borderSide: BorderSide.none,
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),
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focusedBorder: OutlineInputBorder(
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borderRadius: BorderRadius.circular(10),
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borderSide: BorderSide.none,
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),
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),
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style: TextStyle(fontSize: 14, color: colors.onSurface),
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),
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),
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const SizedBox(width: 8),
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GestureDetector(
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onTap: () => _performSearch(_controller.text),
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child: Text('搜索',
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style: TextStyle(
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fontSize: 14,
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color: colors.primary,
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fontWeight: FontWeight.w500)),
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),
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],
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),
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),
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Divider(height: 0.5, thickness: 0.5, color: colors.outline),
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// 结果统计
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if (_searched && !_searching && _allResults.isNotEmpty)
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
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child: Align(
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alignment: Alignment.centerLeft,
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child: Text('共找到 ${_allResults.length} 条结果',
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style: TextStyle(fontSize: 12,
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color: colors.onSurface.withValues(alpha: 0.4))),
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),
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),
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// 结果列表
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Expanded(
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child: _searching
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? Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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CircularProgressIndicator(strokeWidth: 2, color: colors.primary),
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const SizedBox(height: 12),
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Text('搜索中...',
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style: TextStyle(fontSize: 13,
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color: colors.onSurface.withValues(alpha: 0.5))),
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],
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),
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)
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: !_searched
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? Center(
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child: Text('输入关键词搜索书籍内容',
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style: TextStyle(
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fontSize: 13,
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color: colors.onSurface.withValues(alpha: 0.35))))
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: _allResults.isEmpty
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? Center(
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child: Text('未找到相关内容',
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style: TextStyle(
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fontSize: 13,
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color: colors.onSurface.withValues(alpha: 0.35))))
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: ListView.separated(
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controller: _scrollController,
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padding: EdgeInsets.only(bottom: bottomPadding + 16),
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itemCount: _displayResults.length + (_loadingMore ? 1 : 0),
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separatorBuilder: (_, __) =>
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Divider(height: 0.5, indent: 16, endIndent: 16,
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color: colors.outline),
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itemBuilder: (context, index) {
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if (index >= _displayResults.length) {
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return const Padding(
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padding: EdgeInsets.all(16),
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child: Center(
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child: SizedBox(width: 20, height: 20,
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child: CircularProgressIndicator(strokeWidth: 2)),
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),
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);
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}
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final r = _displayResults[index];
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return ListTile(
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contentPadding:
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const EdgeInsets.symmetric(horizontal: 16),
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title: Text(r.chapterTitle,
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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style: TextStyle(
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fontSize: 12,
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color: colors.primary,
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fontWeight: FontWeight.w500)),
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subtitle: RichText(
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maxLines: 2,
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overflow: TextOverflow.ellipsis,
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text: TextSpan(
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children: _buildHighlightedText(
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'...${r.context}...', _currentQuery, colors),
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),
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),
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onTap: () => widget.onNavigate(
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r.chapterIndex, _currentQuery, r.scrollRatio),
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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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}
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}
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class _SearchResult {
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final int chapterIndex;
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final String chapterTitle;
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final String context;
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final int matchIndex;
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final double scrollRatio; // 匹配位置在章节中的比例 (0.0~1.0)
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_SearchResult({
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required this.chapterIndex,
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required this.chapterTitle,
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required this.context,
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required this.matchIndex,
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required this.scrollRatio,
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});
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}
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