313 lines
10 KiB
Dart
313 lines
10 KiB
Dart
// lib/pages/playlist_page.dart
|
|
import 'package:flutter/material.dart';
|
|
import 'package:provider/provider.dart';
|
|
import '../services/audio_service.dart';
|
|
|
|
class PlaylistPage extends StatefulWidget {
|
|
const PlaylistPage({super.key});
|
|
|
|
@override
|
|
State<PlaylistPage> createState() => _PlaylistPageState();
|
|
}
|
|
|
|
class _PlaylistPageState extends State<PlaylistPage> {
|
|
final ScrollController _scrollController = ScrollController();
|
|
final GlobalKey _currentTagKey = GlobalKey();
|
|
|
|
bool _hasScrolledToCurrent = false;
|
|
int _retryCount = 0;
|
|
static const int _maxRetries = 3;
|
|
|
|
// ⭐ 统一滚动时长 1.5 秒
|
|
static const Duration _scrollDuration = Duration(milliseconds: 1500);
|
|
|
|
@override
|
|
void initState() {
|
|
super.initState();
|
|
WidgetsBinding.instance.addPostFrameCallback((_) {
|
|
_scrollToCurrentSong();
|
|
});
|
|
}
|
|
|
|
@override
|
|
void dispose() {
|
|
_scrollController.dispose();
|
|
super.dispose();
|
|
}
|
|
|
|
double _calculateAverageItemHeight(int itemCount) {
|
|
final maxExtent = _scrollController.position.maxScrollExtent;
|
|
if (maxExtent <= 0 || itemCount <= 0) return 72.0;
|
|
return maxExtent / itemCount;
|
|
}
|
|
|
|
double _calculateTargetOffset(
|
|
int currentIndex, int totalCount, double avgHeight) {
|
|
final viewportHeight = _scrollController.position.viewportDimension;
|
|
return (currentIndex * avgHeight) - (viewportHeight / 2) + (avgHeight / 2);
|
|
}
|
|
|
|
Future<void> _scrollToCurrentSong() async {
|
|
if (_hasScrolledToCurrent) return;
|
|
|
|
final service = context.read<AudioService>();
|
|
final queue = service.queue;
|
|
final currentIndex = service.currentIndex;
|
|
|
|
if (queue.isEmpty || currentIndex < 0 || currentIndex >= queue.length) {
|
|
return;
|
|
}
|
|
|
|
await Future.delayed(const Duration(milliseconds: 300));
|
|
if (!mounted) return;
|
|
|
|
final totalCount = queue.length;
|
|
final avgHeight = _calculateAverageItemHeight(totalCount);
|
|
final maxExtent = _scrollController.position.maxScrollExtent;
|
|
|
|
var tagContext = _currentTagKey.currentContext;
|
|
if (tagContext != null) {
|
|
await _calibrateWithTag(tagContext);
|
|
_hasScrolledToCurrent = true;
|
|
return;
|
|
}
|
|
|
|
// ⭐ 粗定位：1.5 秒平滑滚动
|
|
final targetOffset =
|
|
_calculateTargetOffset(currentIndex, totalCount, avgHeight);
|
|
final clampedOffset = targetOffset.clamp(0.0, maxExtent);
|
|
|
|
await _scrollController.animateTo(
|
|
clampedOffset,
|
|
duration: _scrollDuration,
|
|
curve: Curves.easeOutCubic,
|
|
);
|
|
if (!mounted) return;
|
|
|
|
await WidgetsBinding.instance.endOfFrame;
|
|
if (!mounted) return;
|
|
|
|
tagContext = _currentTagKey.currentContext;
|
|
if (tagContext != null) {
|
|
await _calibrateWithTag(tagContext);
|
|
_hasScrolledToCurrent = true;
|
|
return;
|
|
}
|
|
|
|
// ⭐ 迭代修正：每次 1.5 秒平滑滚动
|
|
_retryCount = 0;
|
|
var currentOffset = _scrollController.offset;
|
|
var lastOffset = currentOffset;
|
|
|
|
while (_retryCount < _maxRetries) {
|
|
_retryCount++;
|
|
|
|
final viewportHeight = _scrollController.position.viewportDimension;
|
|
final step = viewportHeight * 0.5;
|
|
final direction = (currentIndex > totalCount / 2) ? -1 : 1;
|
|
final newOffset =
|
|
(currentOffset + direction * step).clamp(0.0, maxExtent);
|
|
|
|
if ((newOffset - currentOffset).abs() < 50) {
|
|
final bigStep = viewportHeight * 0.8 * direction;
|
|
final forcedOffset = (currentOffset + bigStep).clamp(0.0, maxExtent);
|
|
await _scrollController.animateTo(
|
|
forcedOffset,
|
|
duration: _scrollDuration,
|
|
curve: Curves.easeOutCubic,
|
|
);
|
|
} else {
|
|
await _scrollController.animateTo(
|
|
newOffset,
|
|
duration: _scrollDuration,
|
|
curve: Curves.easeOutCubic,
|
|
);
|
|
}
|
|
|
|
if (!mounted) return;
|
|
|
|
await WidgetsBinding.instance.endOfFrame;
|
|
if (!mounted) return;
|
|
|
|
tagContext = _currentTagKey.currentContext;
|
|
if (tagContext != null) {
|
|
await _calibrateWithTag(tagContext);
|
|
_hasScrolledToCurrent = true;
|
|
return;
|
|
}
|
|
|
|
currentOffset = _scrollController.offset;
|
|
if ((currentOffset - lastOffset).abs() < 10) break;
|
|
lastOffset = currentOffset;
|
|
}
|
|
|
|
_hasScrolledToCurrent = true;
|
|
}
|
|
|
|
/// 精确定位：1.5 秒平滑滚动
|
|
Future<void> _calibrateWithTag(BuildContext tagContext) async {
|
|
final renderBox = tagContext.findRenderObject() as RenderBox?;
|
|
if (renderBox == null) return;
|
|
|
|
final tagPosition = renderBox.localToGlobal(Offset.zero);
|
|
final tagSize = renderBox.size;
|
|
final tagCenter = tagPosition.dy + tagSize.height / 2;
|
|
|
|
final screenHeight = MediaQuery.of(context).size.height;
|
|
final screenCenter = screenHeight / 2;
|
|
|
|
final delta = tagCenter - screenCenter;
|
|
final currentOffset = _scrollController.offset;
|
|
final targetOffset = (currentOffset + delta)
|
|
.clamp(0.0, _scrollController.position.maxScrollExtent);
|
|
|
|
if ((targetOffset - currentOffset).abs() < 2) return;
|
|
|
|
await _scrollController.animateTo(
|
|
targetOffset,
|
|
duration: _scrollDuration,
|
|
curve: Curves.easeOutCubic,
|
|
);
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
final service = context.watch<AudioService>();
|
|
final queue = service.queue;
|
|
final currentIndex = service.currentIndex;
|
|
|
|
return Scaffold(
|
|
backgroundColor: const Color(0xFF0E1211),
|
|
appBar: AppBar(
|
|
title: const Text(
|
|
'播放列表',
|
|
style: TextStyle(
|
|
color: Colors.white,
|
|
fontSize: 18,
|
|
fontWeight: FontWeight.w500,
|
|
),
|
|
),
|
|
backgroundColor: Colors.transparent,
|
|
elevation: 0,
|
|
foregroundColor: Colors.white,
|
|
leading: IconButton(
|
|
icon: const Icon(Icons.arrow_back_ios_new),
|
|
onPressed: () => Navigator.pop(context),
|
|
),
|
|
actions: [
|
|
IconButton(
|
|
icon: Icon(service.playModeIcon, color: Colors.white54),
|
|
onPressed: service.togglePlayMode,
|
|
),
|
|
IconButton(
|
|
icon: const Icon(Icons.clear_all, color: Colors.white54),
|
|
onPressed: () {
|
|
showDialog(
|
|
context: context,
|
|
builder: (context) => AlertDialog(
|
|
backgroundColor: const Color(0xFF1A1F1E),
|
|
title: const Text('清空播放列表',
|
|
style: TextStyle(color: Colors.white)),
|
|
content: const Text('确定要清空当前播放列表吗？',
|
|
style: TextStyle(color: Colors.grey)),
|
|
actions: [
|
|
TextButton(
|
|
onPressed: () => Navigator.pop(context),
|
|
child: const Text('取消')),
|
|
TextButton(
|
|
onPressed: () {
|
|
service.clearQueue();
|
|
Navigator.pop(context);
|
|
Navigator.pop(context);
|
|
},
|
|
child:
|
|
const Text('清空', style: TextStyle(color: Colors.red)),
|
|
),
|
|
],
|
|
),
|
|
);
|
|
},
|
|
),
|
|
],
|
|
),
|
|
body: queue.isEmpty
|
|
? const Center(
|
|
child: Column(
|
|
mainAxisAlignment: MainAxisAlignment.center,
|
|
children: [
|
|
Icon(Icons.playlist_play, size: 48, color: Colors.grey),
|
|
SizedBox(height: 16),
|
|
Text('播放列表为空', style: TextStyle(color: Colors.grey)),
|
|
],
|
|
),
|
|
)
|
|
: ListView.builder(
|
|
controller: _scrollController,
|
|
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
|
|
itemCount: queue.length,
|
|
itemBuilder: (context, index) {
|
|
final song = queue[index];
|
|
final isCurrent = index == currentIndex;
|
|
|
|
return ListTile(
|
|
contentPadding: const EdgeInsets.symmetric(
|
|
horizontal: 8,
|
|
vertical: 4,
|
|
),
|
|
leading: Icon(
|
|
isCurrent ? Icons.play_arrow : Icons.music_note,
|
|
color:
|
|
isCurrent ? const Color(0xFFB8D4D0) : Colors.grey[600],
|
|
size: 24,
|
|
),
|
|
title: Text(
|
|
song.title,
|
|
style: TextStyle(
|
|
fontSize: 16,
|
|
fontWeight: isCurrent ? FontWeight.w600 : FontWeight.w400,
|
|
color: isCurrent ? Colors.white : Colors.grey[300],
|
|
),
|
|
maxLines: 1,
|
|
overflow: TextOverflow.ellipsis,
|
|
),
|
|
subtitle: Text(
|
|
song.artist,
|
|
style: TextStyle(
|
|
fontSize: 13,
|
|
color: isCurrent ? Colors.grey[400] : Colors.grey[600],
|
|
),
|
|
maxLines: 1,
|
|
overflow: TextOverflow.ellipsis,
|
|
),
|
|
trailing: isCurrent
|
|
? Container(
|
|
key: _currentTagKey,
|
|
padding: const EdgeInsets.symmetric(
|
|
horizontal: 8,
|
|
vertical: 2,
|
|
),
|
|
decoration: BoxDecoration(
|
|
color:
|
|
const Color(0xFFB8D4D0).withValues(alpha: 0.2),
|
|
borderRadius: BorderRadius.circular(4),
|
|
),
|
|
child: const Text(
|
|
'正在播放',
|
|
style: TextStyle(
|
|
fontSize: 10,
|
|
color: Color(0xFFB8D4D0),
|
|
),
|
|
),
|
|
)
|
|
: null,
|
|
onTap: () {
|
|
service.setQueue(queue, startIndex: index);
|
|
Navigator.pop(context);
|
|
},
|
|
);
|
|
},
|
|
),
|
|
);
|
|
}
|
|
}
|