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439
client/lib/features/writing/screens/writing_detail_screen.dart
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439
client/lib/features/writing/screens/writing_detail_screen.dart
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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../models/writing_task.dart';
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import 'writing_exercise_screen.dart';
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import '../providers/writing_provider.dart';
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/// 写作练习详情页面
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class WritingDetailScreen extends ConsumerWidget {
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final WritingTask task;
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const WritingDetailScreen({
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super.key,
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required this.task,
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});
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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return Scaffold(
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backgroundColor: const Color(0xFFF5F5F5),
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appBar: AppBar(
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title: const Text('写作详情'),
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backgroundColor: Colors.white,
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foregroundColor: Colors.black,
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elevation: 0,
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),
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body: SingleChildScrollView(
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padding: const EdgeInsets.all(16),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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_buildTaskHeader(),
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const SizedBox(height: 20),
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_buildTaskInfo(),
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const SizedBox(height: 20),
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_buildPrompt(),
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const SizedBox(height: 20),
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_buildRequirements(),
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if (task.keywords.isNotEmpty) ...[
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const SizedBox(height: 20),
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_buildKeywords(),
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],
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const SizedBox(height: 30),
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_buildStartButton(context, ref),
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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 _buildTaskHeader() {
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return Container(
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padding: const EdgeInsets.all(20),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(16),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.05),
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blurRadius: 10,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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children: [
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Expanded(
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child: Text(
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task.title,
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style: const TextStyle(
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fontSize: 24,
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fontWeight: FontWeight.bold,
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),
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),
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),
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Container(
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
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decoration: BoxDecoration(
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color: _getDifficultyColor(task.difficulty),
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borderRadius: BorderRadius.circular(16),
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),
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child: Text(
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task.difficulty.displayName,
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style: const TextStyle(
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fontSize: 14,
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color: Colors.white,
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fontWeight: FontWeight.bold,
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),
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),
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),
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],
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),
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const SizedBox(height: 12),
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Text(
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task.description,
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style: const TextStyle(
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fontSize: 16,
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color: Colors.grey,
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height: 1.5,
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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 _buildTaskInfo() {
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return Container(
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padding: const EdgeInsets.all(20),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(16),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.05),
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blurRadius: 10,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text(
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'任务信息',
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style: TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 16),
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Row(
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children: [
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Expanded(
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child: _buildInfoItem(
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Icons.category,
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'类型',
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task.type.displayName,
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const Color(0xFF2196F3),
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),
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),
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Expanded(
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child: _buildInfoItem(
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Icons.timer,
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'时间限制',
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'${task.timeLimit}分钟',
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const Color(0xFF4CAF50),
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),
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),
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],
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),
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const SizedBox(height: 16),
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Row(
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children: [
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Expanded(
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child: _buildInfoItem(
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Icons.text_fields,
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'字数要求',
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'${task.wordLimit}词',
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const Color(0xFFFF9800),
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),
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),
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Expanded(
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child: _buildInfoItem(
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Icons.star,
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'难度等级',
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'${task.difficulty.level}级',
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_getDifficultyColor(task.difficulty),
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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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Widget _buildInfoItem(IconData icon, String label, String value, Color color) {
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return Container(
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padding: const EdgeInsets.all(12),
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decoration: BoxDecoration(
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color: color.withOpacity(0.1),
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borderRadius: BorderRadius.circular(12),
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),
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child: Column(
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children: [
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Icon(
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icon,
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color: color,
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size: 24,
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),
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const SizedBox(height: 8),
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Text(
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label,
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style: const TextStyle(
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fontSize: 12,
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color: Colors.grey,
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),
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),
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const SizedBox(height: 4),
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Text(
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value,
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style: TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.bold,
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color: 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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Widget _buildPrompt() {
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return Container(
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padding: const EdgeInsets.all(20),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(16),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.05),
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blurRadius: 10,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text(
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'写作提示',
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style: TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 12),
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Container(
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: const Color(0xFF2196F3).withOpacity(0.1),
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borderRadius: BorderRadius.circular(12),
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border: Border.all(
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color: const Color(0xFF2196F3).withOpacity(0.3),
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),
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),
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child: Text(
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task.prompt ?? '暂无写作提示',
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style: const TextStyle(
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fontSize: 16,
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height: 1.6,
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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 _buildRequirements() {
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return Container(
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padding: const EdgeInsets.all(20),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(16),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.05),
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blurRadius: 10,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text(
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'写作要求',
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style: TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 12),
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...task.requirements.map((requirement) => Padding(
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padding: const EdgeInsets.only(bottom: 8),
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Icon(
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Icons.check_circle,
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color: Color(0xFF4CAF50),
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size: 20,
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),
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const SizedBox(width: 8),
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Expanded(
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child: Text(
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requirement,
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style: const TextStyle(
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fontSize: 14,
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height: 1.5,
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),
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),
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),
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],
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),
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)).toList(),
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],
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),
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);
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}
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Widget _buildKeywords() {
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return Container(
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padding: const EdgeInsets.all(20),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(16),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.05),
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blurRadius: 10,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text(
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'关键词提示',
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style: TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 12),
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Wrap(
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spacing: 8,
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runSpacing: 8,
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children: task.keywords.map((keyword) => Container(
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
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decoration: BoxDecoration(
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color: const Color(0xFFFF9800).withOpacity(0.1),
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borderRadius: BorderRadius.circular(16),
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border: Border.all(
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color: const Color(0xFFFF9800).withOpacity(0.3),
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),
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),
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child: Text(
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keyword,
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style: const TextStyle(
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fontSize: 14,
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color: Color(0xFFFF9800),
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fontWeight: FontWeight.w500,
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),
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),
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)).toList(),
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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 _buildStartButton(BuildContext context, WidgetRef ref) {
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return SizedBox(
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width: double.infinity,
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height: 56,
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child: ElevatedButton(
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onPressed: () async {
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showDialog(
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context: context,
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barrierDismissible: false,
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builder: (context) => const Center(child: CircularProgressIndicator()),
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);
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try {
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final service = ref.read(writingServiceProvider);
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final freshTask = await service.getWritingTask(task.id);
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Navigator.pop(context);
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Navigator.push(
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context,
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MaterialPageRoute(
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builder: (context) => WritingExerciseScreen(task: freshTask),
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),
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);
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} catch (e) {
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Navigator.pop(context);
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showDialog(
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context: context,
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builder: (context) => AlertDialog(
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title: const Text('加载失败'),
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content: const Text('无法获取最新任务，稍后重试'),
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actions: [
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TextButton(
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onPressed: () => Navigator.pop(context),
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child: const Text('确定'),
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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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style: ElevatedButton.styleFrom(
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backgroundColor: const Color(0xFF2196F3),
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foregroundColor: Colors.white,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(16),
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),
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elevation: 0,
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),
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child: const Text(
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'开始写作',
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style: TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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),
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),
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),
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);
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}
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Color _getDifficultyColor(WritingDifficulty difficulty) {
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switch (difficulty) {
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case WritingDifficulty.beginner:
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return const Color(0xFF4CAF50);
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case WritingDifficulty.elementary:
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return const Color(0xFF8BC34A);
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case WritingDifficulty.intermediate:
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return const Color(0xFFFF9800);
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case WritingDifficulty.upperIntermediate:
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return const Color(0xFFFF5722);
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case WritingDifficulty.advanced:
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return const Color(0xFFF44336);
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}
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}
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}
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