refactor: 将课程各步骤拆分到 features/lesson/steps/
lesson_flow.dart 保留流程状态、公共脚手架与小组件，预习/听/说/读/写/独立表达 六个步骤各自成为 part 文件。代码仅搬移并经 dart format 格式化，无用户可见变化。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
shenlei
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part of '../lesson_flow.dart';
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class _WritingStep extends StatefulWidget {
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const _WritingStep({
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required this.state,
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required this.lessonId,
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required this.segmentId,
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required this.activity,
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required this.controller,
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required this.showHelp,
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required this.canContinue,
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required this.onChanged,
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required this.onToggleHelp,
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required this.onContinue,
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});
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final String lessonId;
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final AppState state;
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final String segmentId;
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final LessonActivity activity;
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final TextEditingController controller;
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final bool showHelp;
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final bool canContinue;
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final VoidCallback onChanged;
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final VoidCallback onToggleHelp;
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final ValueChanged<bool> onContinue;
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@override
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State<_WritingStep> createState() => _WritingStepState();
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}
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class _WritingStepState extends State<_WritingStep> {
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WritingCheckResult? result;
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WritingAiFeedback? aiFeedback;
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String? aiFeedbackError;
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bool requestingAiFeedback = false;
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void _checkOrContinue() {
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if (result?.complete == true) {
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widget.onContinue(aiFeedback != null);
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return;
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}
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setState(
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() => result = WritingFeedback.check(
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widget.lessonId,
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widget.controller.text,
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segmentId: widget.segmentId,
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),
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);
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}
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Future<void> _requestAiFeedback() async {
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if (widget.controller.text.trim().isEmpty || requestingAiFeedback) return;
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if (widget.state.aiProvider == AiProviderType.mock) {
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setState(() => aiFeedbackError = '请先在“我的”配置 AI 服务；本地检查仍可继续学习。');
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return;
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}
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setState(() {
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requestingAiFeedback = true;
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aiFeedbackError = null;
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});
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final feedback = await AiService.instance.writingFeedback(
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provider: widget.state.aiProvider,
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endpoint: widget.state.aiEndpoint,
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model: widget.state.aiModel,
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lessonId: widget.lessonId,
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taskPrompt: widget.activity.writingPrompt,
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answer: widget.controller.text.trim(),
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);
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if (!mounted) return;
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setState(() {
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requestingAiFeedback = false;
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aiFeedback = feedback;
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aiFeedbackError = feedback == null
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? '暂时无法获得 AI 反馈。你的答案保留在这里，可稍后重试或继续本地练习。'
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: null;
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});
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}
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@override
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Widget build(BuildContext context) => _LessonScaffold(
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step: 5,
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child: SpacedColumn(
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children: [
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const Eyebrow('写一写'),
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Text(
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widget.activity.writingPrompt,
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style: Theme.of(context).textTheme.headlineMedium,
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),
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SectionCard(
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tint: AppColors.surfaceMuted,
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child: Text(
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'小提示：${grammarNoteForSegment(widget.segmentId, widget.lessonId)}',
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),
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),
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if (widget.showHelp)
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SectionCard(
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tint: AppColors.softGreen,
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child: Text(
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widget.activity.writingExample,
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style: TextStyle(fontSize: 18, height: 1.5),
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),
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),
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TextField(
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controller: widget.controller,
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onChanged: (_) {
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setState(() {
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result = null;
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aiFeedback = null;
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aiFeedbackError = null;
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});
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widget.onChanged();
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},
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minLines: 3,
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maxLines: 4,
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decoration: InputDecoration(
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labelText: '你的答案',
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hintText: widget.showHelp
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? widget.activity.writingExample
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: '请输入完整英文答案',
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filled: true,
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fillColor: AppColors.surface,
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border: const OutlineInputBorder(),
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),
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),
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TextButton(
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onPressed: widget.onToggleHelp,
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child: Text(widget.showHelp ? '收起示例，自己试一次' : '需要帮助，查看示例'),
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),
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OutlinedButton.icon(
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onPressed: widget.canContinue && !requestingAiFeedback
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? _requestAiFeedback
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: null,
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icon: requestingAiFeedback
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? const 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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: const Icon(Icons.auto_awesome_outlined),
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label: Text(requestingAiFeedback ? '正在获取反馈…' : '获取 AI 写作建议（可选）'),
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),
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if (aiFeedback != null)
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SectionCard(
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tint: aiFeedback!.verdict == 'accepted'
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? AppColors.softGreen
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: AppColors.warm,
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child: SpacedColumn(
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spacing: 6,
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children: [
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Text('AI 建议：${aiFeedback!.feedback}'),
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if (aiFeedback!.missing.isNotEmpty)
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Text('还可补充：${aiFeedback!.missing.join('、')}'),
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if (aiFeedback!.suggestion != null)
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Text('可参考改写：${aiFeedback!.suggestion}'),
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const Text(
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'这是学习帮助；请按自己的意思重写后再检查，系统不会仅凭 AI 建议记为掌握。',
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style: TextStyle(fontSize: 12, color: AppColors.muted),
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),
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],
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),
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),
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if (aiFeedbackError != null)
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SectionCard(
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tint: AppColors.warm,
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child: Text(
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aiFeedbackError!,
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style: const TextStyle(color: AppColors.warmInk),
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),
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),
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if (result != null)
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SectionCard(
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tint: result!.complete ? AppColors.softGreen : AppColors.warm,
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child: Text(
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result!.message,
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style: TextStyle(
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color: result!.complete ? AppColors.green : AppColors.warmInk,
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),
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),
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),
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PrimaryButton(
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label: result?.complete == true ? '进入课程对话' : '检查句子',
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onPressed: widget.canContinue ? _checkOrContinue : null,
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),
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],
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),
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);
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}
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