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sjk
2025-11-17 13:39:05 +08:00
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client/lib/features/writing/screens/writing_task_screen.dart Normal file
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import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'dart:async';
import '../models/writing_task.dart';
import '../models/writing_submission.dart';
import '../providers/writing_provider.dart';
class WritingTaskScreen extends StatefulWidget {
final WritingTask task;
const WritingTaskScreen({
super.key,
required this.task,
});
@override
State<WritingTaskScreen> createState() => _WritingTaskScreenState();
}
class _WritingTaskScreenState extends State<WritingTaskScreen> {
final TextEditingController _contentController = TextEditingController();
final ScrollController _scrollController = ScrollController();
Timer? _timer;
int _elapsedSeconds = 0;
bool _isSubmitting = false;
bool _showInstructions = true;
int _wordCount = 0;
@override
void initState() {
super.initState();
_startTimer();
_contentController.addListener(_updateWordCount);
}
@override
void dispose() {
_timer?.cancel();
_contentController.dispose();
_scrollController.dispose();
super.dispose();
}
void _startTimer() {
_timer = Timer.periodic(const Duration(seconds: 1), (timer) {
setState(() {
_elapsedSeconds++;
});
// 检查时间限制
if (widget.task.timeLimit != null &&
_elapsedSeconds >= widget.task.timeLimit! * 60) {
_showTimeUpDialog();
}
});
}
void _updateWordCount() {
final text = _contentController.text;
final words = text.trim().split(RegExp(r'\s+'));
setState(() {
_wordCount = text.trim().isEmpty ? 0 : words.length;
});
}
void _showTimeUpDialog() {
showDialog(
context: context,
barrierDismissible: false,
builder: (context) => AlertDialog(
title: const Text('时间到！'),
content: const Text('写作时间已结束，请提交您的作品。'),
actions: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
_submitWriting();
},
child: const Text('提交'),
),
],
),
);
}
Future<void> _submitWriting() async {
if (_isSubmitting) return;
final content = _contentController.text.trim();
if (content.isEmpty) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('请输入写作内容')),
);
return;
}
setState(() {
_isSubmitting = true;
});
try {
final provider = Provider.of<WritingProvider>(context, listen: false);
// 首先开始任务（如果还没有开始）
if (provider.currentSubmission == null) {
await provider.startTask(widget.task.id);
}
// 更新内容
provider.updateContent(content);
provider.updateTimeSpent(_elapsedSeconds);
// 提交写作
final success = await provider.submitWriting();
if (mounted && success) {
Navigator.of(context).pop(true);
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('写作已提交，正在批改中...')),
);
} else if (mounted && !success) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('提交失败，请重试')),
);
}
} catch (e) {
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('提交失败: $e')),
);
}
} finally {
if (mounted) {
setState(() {
_isSubmitting = false;
});
}
}
}
String _formatTime(int seconds) {
final minutes = seconds ~/ 60;
final remainingSeconds = seconds % 60;
return '${minutes.toString().padLeft(2, '0')}:${remainingSeconds.toString().padLeft(2, '0')}';
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.task.title),
actions: [
IconButton(
icon: Icon(_showInstructions ? Icons.visibility_off : Icons.visibility),
onPressed: () {
setState(() {
_showInstructions = !_showInstructions;
});
},
),
IconButton(
icon: const Icon(Icons.help_outline),
onPressed: _showHelpDialog,
),
],
),
body: Column(
children: [
// 状态栏
Container(
padding: const EdgeInsets.all(16),
decoration: BoxDecoration(
color: Colors.grey[100],
border: Border(
bottom: BorderSide(color: Colors.grey[300]!),
),
),
child: Row(
children: [
Icon(
Icons.timer,
size: 20,
color: _getTimeColor(),
),
const SizedBox(width: 8),
Text(
_formatTime(_elapsedSeconds),
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.bold,
color: _getTimeColor(),
),
),
if (widget.task.timeLimit != null)
Text(
' / ${widget.task.timeLimit}分钟',
style: const TextStyle(fontSize: 14, color: Colors.grey),
),
const Spacer(),
Icon(
Icons.text_fields,
size: 20,
color: _getWordCountColor(_wordCount),
),
const SizedBox(width: 8),
Text(
'$_wordCount',
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.bold,
color: _getWordCountColor(_wordCount),
),
),
if (widget.task.wordLimit != null)
Text(
' / ${widget.task.wordLimit}字',
style: const TextStyle(fontSize: 14, color: Colors.grey),
),
],
),
),
// 任务说明
if (_showInstructions)
Container(
width: double.infinity,
padding: const EdgeInsets.all(16),
decoration: BoxDecoration(
color: Colors.blue[50],
border: Border(
bottom: BorderSide(color: Colors.grey[300]!),
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
children: [
Icon(
Icons.assignment,
color: Colors.blue[700],
size: 20,
),
const SizedBox(width: 8),
Text(
'任务要求',
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.bold,
color: Colors.blue[700],
),
),
],
),
const SizedBox(height: 8),
Text(
widget.task.description,
style: const TextStyle(fontSize: 14),
),
if (widget.task.requirements.isNotEmpty) ...[
const SizedBox(height: 12),
const Text(
'具体要求:',
style: TextStyle(
fontSize: 14,
fontWeight: FontWeight.w600,
),
),
const SizedBox(height: 4),
...widget.task.requirements.map((req) => Padding(
padding: const EdgeInsets.only(left: 16, bottom: 2),
child: Text(
'• $req',
style: const TextStyle(fontSize: 13),
),
)).toList(),
],
if (widget.task.keywords.isNotEmpty) ...[
const SizedBox(height: 12),
const Text(
'关键词:',
style: TextStyle(
fontSize: 14,
fontWeight: FontWeight.w600,
),
),
const SizedBox(height: 4),
Wrap(
spacing: 8,
children: widget.task.keywords.map((keyword) => Chip(
label: Text(
keyword,
style: const TextStyle(fontSize: 12),
),
backgroundColor: Colors.blue[100],
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
)).toList(),
),
],
if (widget.task.prompt != null && widget.task.prompt!.isNotEmpty) ...[
const SizedBox(height: 12),
const Text(
'提示:',
style: TextStyle(
fontSize: 14,
fontWeight: FontWeight.w600,
),
),
const SizedBox(height: 4),
Padding(
padding: const EdgeInsets.only(left: 16, bottom: 2),
child: Text(
'💡 ${widget.task.prompt}',
style: const TextStyle(fontSize: 13),
),
),
],
],
),
),
// 写作区域
Expanded(
child: Padding(
padding: const EdgeInsets.all(16),
child: TextField(
controller: _contentController,
maxLines: null,
expands: true,
decoration: const InputDecoration(
hintText: '请在此处开始写作...',
border: OutlineInputBorder(),
contentPadding: EdgeInsets.all(16),
),
style: const TextStyle(fontSize: 16, height: 1.5),
),
),
),
],
),
bottomNavigationBar: Container(
padding: const EdgeInsets.all(16),
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.grey.withOpacity(0.2),
spreadRadius: 1,
blurRadius: 3,
offset: const Offset(0, -1),
),
],
),
child: Row(
children: [
Expanded(
child: OutlinedButton(
onPressed: () => Navigator.of(context).pop(),
child: const Text('保存草稿'),
),
),
const SizedBox(width: 16),
Expanded(
child: ElevatedButton(
onPressed: _isSubmitting ? null : _submitWriting,
child: _isSubmitting
? const SizedBox(
width: 20,
height: 20,
child: CircularProgressIndicator(strokeWidth: 2),
)
: const Text('提交'),
),
),
],
),
),
);
}
Color _getTimeColor() {
if (widget.task.timeLimit == null) return Colors.blue;
final remainingMinutes = (widget.task.timeLimit! * 60 - _elapsedSeconds) / 60;
if (remainingMinutes <= 5) return Colors.red;
if (remainingMinutes <= 10) return Colors.orange;
return Colors.blue;
}
Color _getWordCountColor(int wordCount) {
if (widget.task.wordLimit == null) return Colors.green;
final ratio = wordCount / widget.task.wordLimit!;
if (ratio > 1.1) return Colors.red;
if (ratio > 0.9) return Colors.green;
if (ratio > 0.5) return Colors.orange;
return Colors.grey;
}
void _showHelpDialog() {
showDialog(
context: context,
builder: (context) => AlertDialog(
title: const Text('写作帮助'),
content: const SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: [
Text(
'写作技巧:',
style: TextStyle(fontWeight: FontWeight.bold),
),
SizedBox(height: 8),
Text('• 仔细阅读任务要求，确保理解题意'),
Text('• 合理安排时间，留出检查和修改的时间'),
Text('• 注意文章结构，包括开头、主体和结尾'),
Text('• 使用多样化的词汇和句式'),
Text('• 检查语法、拼写和标点符号'),
SizedBox(height: 12),
Text(
'评分标准:',
style: TextStyle(fontWeight: FontWeight.bold),
),
SizedBox(height: 8),
Text('• 内容相关性和完整性'),
Text('• 语言准确性和流畅性'),
Text('• 词汇丰富度和语法复杂性'),
Text('• 文章结构和逻辑性'),
],
),
),
actions: [
TextButton(
onPressed: () => Navigator.of(context).pop(),
child: const Text('知道了'),
),
],
),
);
}
}