8 changed files with 349 additions and 305 deletions
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import 'dart:convert'; |
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import 'dart:io'; |
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import 'dart:ui'; |
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import 'package:flutter/material.dart'; |
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import 'package:flutter/services.dart'; |
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import 'package:file_picker/file_picker.dart'; |
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|
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class TextEditor extends StatefulWidget { |
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final String tabId; |
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final String? initialContent; |
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final String? fileName; |
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final Function(String, String?)? onContentChanged; |
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final Function(String)? onFileLoaded; |
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const TextEditor({ |
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super.key, |
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required this.tabId, |
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this.initialContent, |
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this.fileName, |
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this.onContentChanged, |
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this.onFileLoaded, |
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}); |
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@override |
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State<TextEditor> createState() => _TextEditorState(); |
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} |
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class _TextEditorState extends State<TextEditor> { |
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late TextEditingController _controller; |
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late FocusNode _focusNode; |
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late ScrollController _scrollController; |
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bool _isLoading = false; |
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static const int maxFileSize = 1024 * 1024; // 1MB |
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@override |
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void initState() { |
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super.initState(); |
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_controller = TextEditingController(text: widget.initialContent ?? ''); |
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_focusNode = FocusNode(); |
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_scrollController = ScrollController(); |
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WidgetsBinding.instance.addPostFrameCallback((_) { |
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FocusScope.of(context).requestFocus(_focusNode); |
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}); |
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} |
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@override |
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void didUpdateWidget(TextEditor oldWidget) { |
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super.didUpdateWidget(oldWidget); |
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if (oldWidget.initialContent != widget.initialContent) { |
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_controller.text = widget.initialContent ?? ''; |
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} |
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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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_focusNode.dispose(); |
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_scrollController.dispose(); |
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super.dispose(); |
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} |
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@override |
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Widget build(BuildContext context) { |
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return Column( |
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children: [ |
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Container( |
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height: 40, |
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padding: const EdgeInsets.symmetric(horizontal: 16), |
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decoration: BoxDecoration( |
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color: Colors.grey[100], |
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border: Border(bottom: BorderSide(color: Colors.grey[300]!)), |
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), |
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child: Row( |
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mainAxisAlignment: MainAxisAlignment.spaceBetween, |
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children: [ |
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Text( |
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'源文本${_controller.text.isEmpty ? '' : ' (${widget.fileName ?? ''}${_controller.text.length}字符)'}', |
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style: const TextStyle(fontWeight: FontWeight.bold), |
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), |
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Row( |
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children: [ |
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IconButton( |
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icon: const Icon(Icons.folder_open, size: 20), |
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tooltip: '打开文件', |
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onPressed: _isLoading ? null : () => _openFile(context), |
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), |
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IconButton( |
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icon: const Icon(Icons.content_copy, size: 20), |
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tooltip: '复制内容', |
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onPressed: |
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_controller.text.isEmpty |
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? null |
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: () => _copyToClipboard(context, _controller.text), |
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), |
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IconButton( |
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icon: const Icon(Icons.save, size: 20), |
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tooltip: '保存到文件', |
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onPressed: |
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_controller.text.isEmpty |
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? null |
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: () => _saveFile(context, _controller.text), |
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), |
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if (_isLoading) |
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const Padding( |
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padding: EdgeInsets.only(left: 8), |
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child: SizedBox( |
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width: 16, |
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height: 16, |
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child: CircularProgressIndicator(strokeWidth: 2), |
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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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Expanded( |
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child: ScrollConfiguration( |
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behavior: ScrollConfiguration.of(context).copyWith( |
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scrollbars: true, |
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dragDevices: {PointerDeviceKind.touch, PointerDeviceKind.mouse}, |
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), |
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child: SingleChildScrollView( |
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controller: _scrollController, |
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child: Stack( |
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children: [ |
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TextField( |
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controller: _controller, |
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focusNode: _focusNode, |
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maxLines: null, |
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onChanged: (text) { |
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widget.onContentChanged?.call(text, widget.fileName); |
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}, |
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decoration: const InputDecoration( |
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border: InputBorder.none, |
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contentPadding: EdgeInsets.all(16), |
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), |
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style: TextStyle( |
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fontFamily: 'monospace', |
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fontSize: 14, |
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color: Theme.of(context).textTheme.bodyLarge?.color, |
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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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} |
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|
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Future<void> _openFile(BuildContext context) async { |
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final result = await FilePicker.platform.pickFiles(type: FileType.any, allowMultiple: false); |
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if (result != null && result.files.single.path != null) { |
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await loadFile(context, result.files.single.path!); |
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} |
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} |
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Future<void> _copyToClipboard(BuildContext context, String content) async { |
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await Clipboard.setData(ClipboardData(text: content)); |
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if (context.mounted) { |
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ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('已复制到剪贴板'))); |
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} |
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} |
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Future<void> _saveFile(BuildContext context, String content) async { |
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try { |
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String? outputPath = await FilePicker.platform.saveFile( |
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dialogTitle: '保存文件', |
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fileName: 'untitled.txt', |
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allowedExtensions: ['txt'], |
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type: FileType.any, |
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); |
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if (outputPath == null) return; |
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final file = File(outputPath); |
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if (await file.exists()) { |
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final shouldOverwrite = await showDialog<bool>( |
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context: context, |
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builder: |
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(context) => AlertDialog( |
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title: const Text('文件已存在'), |
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content: const Text('要覆盖现有文件吗？'), |
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actions: [ |
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TextButton( |
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onPressed: () => Navigator.pop(context, false), |
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child: const Text('取消'), |
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), |
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TextButton( |
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onPressed: () => Navigator.pop(context, true), |
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child: const Text('覆盖'), |
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), |
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], |
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), |
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); |
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if (shouldOverwrite != true) return; |
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} |
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await file.writeAsString(content); |
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if (context.mounted) { |
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ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('已保存到: ${file.path}'))); |
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} |
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} on FileSystemException catch (e) { |
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if (context.mounted) { |
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ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('保存失败: ${e.message}'))); |
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} |
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} catch (e) { |
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if (context.mounted) { |
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ScaffoldMessenger.of( |
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context, |
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).showSnackBar(SnackBar(content: Text('保存失败: ${e.toString()}'))); |
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} |
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} |
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} |
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Future<void> loadFile(BuildContext context, String filePath) async { |
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try { |
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setState(() => _isLoading = true); |
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final file = File(filePath); |
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final fileSize = await file.length(); |
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// 检查文件大小 |
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if (fileSize > maxFileSize) { |
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if (context.mounted) { |
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ScaffoldMessenger.of( |
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context, |
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).showSnackBar(const SnackBar(content: Text('文件过大(超过1MB)，无法处理'))); |
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} |
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return; |
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} |
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// 判断当前是否有内容 |
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if (_controller.text.isNotEmpty) { |
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final confirm = await showDialog<bool>( |
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context: context, |
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builder: |
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(context) => AlertDialog( |
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title: const Text('确认提示'), |
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content: const Text('确认是否打开新的文件？打开后将覆盖当前内容'), |
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actions: [ |
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TextButton( |
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onPressed: () => Navigator.pop(context, false), |
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child: const Text('取消'), |
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), |
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TextButton( |
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onPressed: () => Navigator.pop(context, true), |
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child: const Text('确认'), |
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), |
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], |
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), |
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); |
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if (confirm != true) { |
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return; |
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} |
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} |
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final fileName = file.path.split('\\').last; |
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// 清空当前内容 |
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_controller.text = ''; |
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widget.onContentChanged?.call('', fileName); |
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// 逐行读取文件 |
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final stream = file.openRead(); |
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final lines = stream.transform(utf8.decoder).transform(const LineSplitter()); |
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await for (final line in lines) { |
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if (!mounted) break; |
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setState(() { |
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_controller.text += '$line\n'; |
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widget.onContentChanged?.call(_controller.text, fileName); |
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}); |
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WidgetsBinding.instance.addPostFrameCallback((_) { |
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_scrollController.jumpTo(_scrollController.position.maxScrollExtent); |
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}); |
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await Future.delayed(const Duration(milliseconds: 10)); |
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} |
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widget.onFileLoaded?.call(file.path); |
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if (context.mounted) { |
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ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('已加载: ${file.path}'))); |
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} |
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} on FormatException { |
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if (context.mounted) { |
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ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('这不是可读的文本文件'))); |
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} |
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} on FileSystemException catch (e) { |
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if (context.mounted) { |
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ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('文件访问错误: ${e.message}'))); |
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} |
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} catch (e) { |
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if (context.mounted) { |
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ScaffoldMessenger.of( |
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context, |
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).showSnackBar(SnackBar(content: Text('读取失败: ${e.toString()}'))); |
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} |
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} finally { |
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if (mounted) { |
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setState(() => _isLoading = false); |
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} |
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} |
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} |
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} |
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