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 _IndependentStep extends StatefulWidget {
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const _IndependentStep({
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required this.state,
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required this.segmentId,
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required this.keepRecording,
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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.onNeedHelp,
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required this.onLookup,
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required this.onContinue,
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required this.onLater,
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});
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final AppState state;
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final LessonActivity activity;
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final String segmentId;
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final bool keepRecording;
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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 onNeedHelp;
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final VoidCallback onLookup;
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final void Function(bool spoken, String? recordingPath) onContinue;
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final VoidCallback onLater;
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@override
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State<_IndependentStep> createState() => _IndependentStepState();
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}
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class _IndependentStepState extends State<_IndependentStep>
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with VoiceAnswerMixin<_IndependentStep> {
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bool usedVoice = false;
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bool transcriptEdited = false;
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String lastTranscript = '';
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String? validationError;
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@override
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AppState get voiceState => widget.state;
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@override
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void dispose() {
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disposeVoiceAnswer(keepRecording: widget.keepRecording);
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super.dispose();
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}
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void _submit() {
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if (!matchesSegmentIndependent(widget.segmentId, widget.controller.text)) {
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setState(() => validationError = '这次还没有用上本段要练的内容。查看帮助后补充一次。');
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return;
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}
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widget.onContinue(
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usedVoice && !transcriptEdited,
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widget.keepRecording ? recordingPath : null,
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);
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}
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Future<void> _toggleMic() async {
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if (aiVoiceRecording) {
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await finishVoiceInput(
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onTranscript: (text) {
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widget.controller.text = text;
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usedVoice = true;
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lastTranscript = text;
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transcriptEdited = false;
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},
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afterTranscribe: widget.onChanged,
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);
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return;
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}
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if (listening) {
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await VoiceService.instance.stopListening();
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if (mounted) setState(() => listening = false);
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return;
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}
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final ready = await VoiceService.instance.startListening(
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(text, _) {
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if (!mounted) return;
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setState(() {
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widget.controller.text = text;
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usedVoice = true;
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lastTranscript = text;
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transcriptEdited = false;
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});
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widget.onChanged();
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},
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onStatus: (status) {
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if (mounted && (status == 'notListening' || status == 'done')) {
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setState(() => listening = false);
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}
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},
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onError: (err) {
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if (mounted) {
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setState(() => listening = false);
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}
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},
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);
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if (!ready) {
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final recordStarted = await startVoiceInput();
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if (recordStarted && mounted) {
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showVoiceMessage('已启动麦克风录音，说完后再次点击，AI 将自动转写为英文。');
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}
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return;
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}
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if (mounted) setState(() => listening = ready);
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}
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@override
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Widget build(BuildContext context) => _LessonScaffold(
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step: 6,
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child: SpacedColumn(
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children: [
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const Eyebrow('试着自己写 / 说一次 · 约 1 分钟'),
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Text('现在不看句框。', style: Theme.of(context).textTheme.headlineMedium),
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Text(widget.activity.independentPrompt),
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if (widget.showHelp)
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SectionCard(
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tint: AppColors.warm,
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child: Text(
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'帮助：${widget.activity.independentHelp}',
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style: TextStyle(color: AppColors.warmInk),
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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: (value) {
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if (usedVoice && value != lastTranscript) transcriptEdited = true;
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setState(() {});
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widget.onChanged();
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},
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minLines: 2,
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maxLines: 4,
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decoration: InputDecoration(
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hintText: '输入完整英文句子',
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filled: true,
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fillColor: AppColors.surface,
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prefixIcon: IconButton(
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tooltip: listening ? '停止录音' : '语音输入',
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icon: Icon(
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listening ? Icons.stop_circle_outlined : Icons.mic_none,
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),
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onPressed: _toggleMic,
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),
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border: OutlineInputBorder(),
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),
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),
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SectionCard(
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tint: AppColors.surfaceMuted,
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child: SpacedColumn(
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spacing: 8,
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children: [
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Text(
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widget.keepRecording
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? '可录下这次尝试并保存在本机；不会发送给 AI。'
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: '可录下这次尝试并回听；离开本页后会自动删除。',
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),
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RecordingControls(
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recording: recording,
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playing: playingRecording,
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hasRecording: recordingPath != null,
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onToggleRecording: toggleRecording,
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onPlay: playRecording,
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onDelete: deleteRecording,
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),
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],
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),
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),
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if (usedVoice)
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SectionCard(
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tint: transcriptEdited ? AppColors.warm : AppColors.softGreen,
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child: Text(
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transcriptEdited
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? '你修改了设备转写：这次会按文字练习保存，不计口语练习。'
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: '这是设备转写。未修改并确认后，会保留为本次语音练习记录。',
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style: TextStyle(
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color: transcriptEdited ? AppColors.warmInk : AppColors.green,
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),
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),
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),
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if (validationError != null)
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SectionCard(
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tint: AppColors.warm,
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child: Text(
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validationError!,
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style: const TextStyle(color: AppColors.warmInk),
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),
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),
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if (!widget.showHelp)
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Wrap(
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spacing: 8,
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children: [
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TextButton(
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onPressed: widget.onNeedHelp,
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child: const Text('需要帮助'),
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),
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TextButton(
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onPressed: widget.onLookup,
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child: const Text('查词或短语'),
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),
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],
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)
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else
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TextButton(onPressed: widget.onLookup, child: const Text('查词或短语')),
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PrimaryButton(
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label: widget.showHelp ? '带帮助完成' : '独立完成',
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onPressed: widget.canContinue ? _submit : null,
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),
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TextButton(onPressed: widget.onLater, child: const Text('稍后继续')),
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],
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),
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);
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}
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