470 lines
17 KiB
Dart
470 lines
17 KiB
Dart
import 'package:flutter/material.dart';
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import '../models/conversation_scenario.dart';
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/// 场景练习页面
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class ScenarioPracticeScreen extends StatefulWidget {
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final ConversationScenario scenario;
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const ScenarioPracticeScreen({
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Key? key,
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required this.scenario,
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}) : super(key: key);
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@override
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State<ScenarioPracticeScreen> createState() => _ScenarioPracticeScreenState();
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}
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class _ScenarioPracticeScreenState extends State<ScenarioPracticeScreen> {
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int _currentStepIndex = 0;
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List<String> _userResponses = [];
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bool _isCompleted = false;
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@override
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void initState() {
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super.initState();
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_userResponses = List.filled(widget.scenario.steps.length, '');
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}
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ScenarioStep get _currentStep => widget.scenario.steps[_currentStepIndex];
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void _selectOption(String option) {
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setState(() {
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_userResponses[_currentStepIndex] = option;
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});
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}
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void _nextStep() {
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if (_currentStepIndex < widget.scenario.steps.length - 1) {
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setState(() {
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_currentStepIndex++;
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});
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} else {
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setState(() {
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_isCompleted = true;
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});
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_showCompletionDialog();
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}
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}
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void _previousStep() {
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if (_currentStepIndex > 0) {
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setState(() {
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_currentStepIndex--;
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});
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}
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}
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void _showCompletionDialog() {
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showDialog(
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context: context,
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barrierDismissible: false,
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builder: (context) => AlertDialog(
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title: const Text('🎉 恭喜完成！'),
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content: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Text('您已成功完成「${widget.scenario.title}」场景练习！'),
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const SizedBox(height: 16),
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const Text('继续练习可以提高您的英语口语水平。'),
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],
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),
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actions: [
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TextButton(
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onPressed: () {
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Navigator.of(context).pop(); // 关闭对话框
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Navigator.of(context).pop(); // 返回主页
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},
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child: const Text('返回主页'),
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),
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ElevatedButton(
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onPressed: () {
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Navigator.of(context).pop(); // 关闭对话框
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_restartScenario();
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},
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child: const Text('重新练习'),
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),
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],
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),
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);
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}
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void _restartScenario() {
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setState(() {
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_currentStepIndex = 0;
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_userResponses = List.filled(widget.scenario.steps.length, '');
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_isCompleted = false;
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});
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}
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void _showScenarioInfo() {
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showModalBottomSheet(
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context: context,
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isScrollControlled: true,
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builder: (context) => DraggableScrollableSheet(
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initialChildSize: 0.7,
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maxChildSize: 0.9,
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minChildSize: 0.5,
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builder: (context, scrollController) => Container(
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padding: const EdgeInsets.all(20),
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decoration: const BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
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),
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child: SingleChildScrollView(
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controller: scrollController,
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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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Text(
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widget.scenario.type.icon,
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style: const TextStyle(fontSize: 32),
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),
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const SizedBox(width: 12),
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Expanded(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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widget.scenario.title,
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style: const TextStyle(
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fontSize: 20,
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fontWeight: FontWeight.bold,
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),
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),
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Text(
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widget.scenario.subtitle,
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style: const TextStyle(
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fontSize: 14,
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color: Colors.grey,
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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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const SizedBox(height: 20),
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Text(
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widget.scenario.description,
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style: const TextStyle(fontSize: 16),
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),
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const SizedBox(height: 20),
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const Text(
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'学习目标',
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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: 8),
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...widget.scenario.objectives.map(
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(objective) => Padding(
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padding: const EdgeInsets.only(bottom: 4),
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child: Row(
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children: [
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const Icon(Icons.check_circle,
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color: Colors.green, size: 16),
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const SizedBox(width: 8),
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Expanded(child: Text(objective)),
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],
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),
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),
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),
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const SizedBox(height: 20),
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const Text(
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'关键短语',
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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: 8),
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Wrap(
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spacing: 8,
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runSpacing: 8,
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children: widget.scenario.keyPhrases.map(
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(phrase) => Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 12,
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vertical: 6,
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),
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decoration: BoxDecoration(
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color: Colors.blue.withOpacity(0.1),
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borderRadius: BorderRadius.circular(16),
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border: Border.all(color: Colors.blue.withOpacity(0.3)),
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),
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child: Text(
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phrase,
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style: const TextStyle(
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fontSize: 12,
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color: Colors.blue,
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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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),
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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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return Scaffold(
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appBar: AppBar(
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title: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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widget.scenario.title,
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style: const TextStyle(fontSize: 16),
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),
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Text(
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'步骤 ${_currentStepIndex + 1}/${widget.scenario.steps.length}',
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style: const TextStyle(fontSize: 12, color: Colors.grey),
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),
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],
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),
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actions: [
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IconButton(
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onPressed: _showScenarioInfo,
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icon: const Icon(Icons.info_outline),
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),
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],
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),
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body: Column(
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children: [
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// 进度条
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LinearProgressIndicator(
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value: (_currentStepIndex + 1) / widget.scenario.steps.length,
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backgroundColor: Colors.grey[300],
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valueColor: const AlwaysStoppedAnimation<Color>(Colors.blue),
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),
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Expanded(
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child: Padding(
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padding: const EdgeInsets.all(20),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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// 步骤标题
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Container(
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width: double.infinity,
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: Colors.blue.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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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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_currentStep.title,
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style: const TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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color: Colors.blue,
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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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_currentStep.description,
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style: const TextStyle(
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fontSize: 14,
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color: Colors.grey,
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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: 20),
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// 对话内容
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Expanded(
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child: Container(
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width: double.infinity,
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: _currentStep.role == 'npc'
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? Colors.grey[100]
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: Colors.blue[50],
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borderRadius: BorderRadius.circular(12),
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border: Border.all(
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color: _currentStep.role == 'npc'
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? Colors.grey.withOpacity(0.3)
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: Colors.blue.withOpacity(0.3),
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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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CircleAvatar(
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radius: 16,
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backgroundColor: _currentStep.role == 'npc'
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? Colors.grey
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: Colors.blue,
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child: Text(
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_currentStep.role == 'npc' ? 'NPC' : 'YOU',
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style: const TextStyle(
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fontSize: 10,
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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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const SizedBox(width: 12),
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Text(
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_currentStep.role == 'npc' ? '对方说：' : '您说：',
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style: const TextStyle(
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fontSize: 14,
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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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const SizedBox(height: 12),
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Text(
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_currentStep.content,
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style: const TextStyle(fontSize: 16),
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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: 20),
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// 选项
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if (_currentStep.options.isNotEmpty) ...[
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const Text(
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'请选择您的回应：',
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style: TextStyle(
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fontSize: 16,
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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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...(_currentStep.options.asMap().entries.map(
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(entry) {
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final index = entry.key;
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final option = entry.value;
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final isSelected = _userResponses[_currentStepIndex] == option;
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return Padding(
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padding: const EdgeInsets.only(bottom: 8),
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child: GestureDetector(
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onTap: () => _selectOption(option),
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child: Container(
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width: double.infinity,
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: isSelected
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? Colors.blue.withOpacity(0.1)
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: Colors.white,
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borderRadius: BorderRadius.circular(12),
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border: Border.all(
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color: isSelected
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? Colors.blue
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: Colors.grey.withOpacity(0.3),
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width: isSelected ? 2 : 1,
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),
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),
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child: Row(
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children: [
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Container(
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width: 24,
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height: 24,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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color: isSelected
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? Colors.blue
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: Colors.grey[300],
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),
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child: Center(
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child: Text(
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String.fromCharCode(65 + index), // A, B, C
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style: TextStyle(
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color: isSelected
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? Colors.white
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: Colors.grey[600],
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fontWeight: FontWeight.bold,
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fontSize: 12,
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),
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),
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),
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),
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const SizedBox(width: 12),
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Expanded(
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child: Text(
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option,
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style: TextStyle(
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fontSize: 14,
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color: isSelected
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? Colors.blue
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: Colors.black,
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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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],
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),
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),
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),
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// 底部按钮
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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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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: Row(
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children: [
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if (_currentStepIndex > 0)
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Expanded(
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child: OutlinedButton(
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onPressed: _previousStep,
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child: const Text('上一步'),
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),
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),
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if (_currentStepIndex > 0) const SizedBox(width: 12),
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Expanded(
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child: ElevatedButton(
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onPressed: _userResponses[_currentStepIndex].isNotEmpty ||
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_currentStep.options.isEmpty
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? _nextStep
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: null,
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child: Text(
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_currentStepIndex == widget.scenario.steps.length - 1
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? '完成练习'
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: '下一步',
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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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} |