feat(playlist): 歌单数据层 + 加入歌单入口
数据层： - PlaylistSummary（歌单名/歌曲数/封面），DB 用一条 SQL 取摘要， 封面取歌单内第一首有封面的歌 - PlaylistRepository.getSummaries() / addSongs()（批量加入并去重） - 修复 AudioService.playPlaylist：之前把文件路径直接当 URL， 歌单播放必然失败；现在用 WebDAVService.getFileUrl 构造 入口（视觉为临时实现，等设计稿替换）： - 文件列表长按 -> "加入歌单" 底部弹层 - 可在弹层里新建歌单并直接加入 真机验证：长按歌曲 -> 新建 "TL" -> 数据库 playlists/playlist_songs 均有记录。 测试：新增 playlist_summary 4 个用例，累计 29 个全绿。
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// lib/widgets/add_to_playlist_sheet.dart
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import 'package:flutter/material.dart';
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import '../models/playlist_summary.dart';
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import '../repositories/playlist_repository.dart';
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/// 把一首歌加入歌单的底部弹层。
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///
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/// 视觉先保持系统样式，等设计定稿后只换这个文件即可，
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/// 调用方（文件列表长按）不用改。
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Future<void> showAddToPlaylistSheet(
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BuildContext context, {
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required String songPath,
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}) async {
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final repo = PlaylistRepository();
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List<PlaylistSummary> playlists;
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try {
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playlists = await repo.getSummaries();
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} catch (e) {
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if (context.mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('读取歌单失败: $e')),
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);
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}
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return;
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}
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if (!context.mounted) return;
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await showModalBottomSheet<void>(
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context: context,
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backgroundColor: const Color(0xFF1A1F1E),
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builder: (sheetContext) {
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return SafeArea(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Padding(
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padding: EdgeInsets.fromLTRB(20, 18, 20, 8),
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child: Align(
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alignment: Alignment.centerLeft,
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child: Text(
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'加入歌单',
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style: TextStyle(
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color: Colors.white,
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fontSize: 16,
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fontWeight: FontWeight.w500,
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),
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),
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),
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),
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ListTile(
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leading: const Icon(Icons.add, color: Color(0xFFB8D4D0)),
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title: const Text(
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'新建歌单',
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style: TextStyle(color: Color(0xFFB8D4D0)),
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),
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onTap: () async {
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Navigator.pop(sheetContext);
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await _createPlaylistAndAdd(context, repo, songPath);
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},
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),
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const Divider(height: 1, color: Colors.white12),
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if (playlists.isEmpty)
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const Padding(
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padding: EdgeInsets.symmetric(vertical: 24),
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child: Text(
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'还没有歌单，先新建一个',
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style: TextStyle(color: Colors.grey, fontSize: 13),
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),
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)
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else
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ConstrainedBox(
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constraints: const BoxConstraints(maxHeight: 320),
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child: ListView.builder(
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shrinkWrap: true,
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itemCount: playlists.length,
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itemBuilder: (context, index) {
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final playlist = playlists[index];
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return ListTile(
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leading: const Icon(
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Icons.queue_music,
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color: Color(0xFFB8D4D0),
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),
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title: Text(
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playlist.name,
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style: const TextStyle(color: Colors.white),
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),
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subtitle: Text(
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'${playlist.songCount} 首',
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style: const TextStyle(
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color: Colors.grey, fontSize: 12),
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),
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onTap: () async {
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final added = await repo.addSongs(
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playlist.id,
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[songPath],
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);
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if (!sheetContext.mounted) return;
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Navigator.pop(sheetContext);
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text(added > 0
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? '已加入「${playlist.name}」'
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: '这首歌已经在「${playlist.name}」里了'),
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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: 8),
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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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Future<void> _createPlaylistAndAdd(
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BuildContext context,
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PlaylistRepository repo,
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String songPath,
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) async {
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final controller = TextEditingController();
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final name = await showDialog<String>(
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context: context,
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builder: (dialogContext) => AlertDialog(
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backgroundColor: const Color(0xFF1A1F1E),
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title: const Text('新建歌单', style: TextStyle(color: Colors.white)),
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content: TextField(
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controller: controller,
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autofocus: true,
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style: const TextStyle(color: Colors.white),
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decoration: const InputDecoration(hintText: '歌单名称'),
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),
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actions: [
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TextButton(
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onPressed: () => Navigator.pop(dialogContext),
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child: const Text('取消'),
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),
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TextButton(
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onPressed: () =>
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Navigator.pop(dialogContext, controller.text.trim()),
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child: const Text('创建'),
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),
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],
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),
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);
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if (name == null || name.isEmpty) return;
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try {
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final playlist = await repo.createPlaylist(name);
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await repo.addSongs(playlist.id, [songPath]);
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if (!context.mounted) return;
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('已新建「$name」并加入这首歌')),
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);
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} catch (e) {
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if (!context.mounted) return;
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('新建歌单失败: $e')),
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);
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}
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}
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