383 lines
15 KiB
Dart
383 lines
15 KiB
Dart
import 'dart:async';
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import 'package:audio_service/audio_service.dart';
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import 'package:dio/dio.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:freezer/api/definitions.dart';
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import 'package:freezer/api/pipe_api.dart';
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import 'package:freezer/api/player/audio_handler.dart';
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import 'package:freezer/settings.dart';
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import 'package:freezer/translations.i18n.dart';
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import 'package:freezer/ui/error.dart';
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import 'package:freezer/ui/player_bar.dart';
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import 'package:freezer/ui/player_screen.dart';
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class LyricsScreen extends StatelessWidget {
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const LyricsScreen({super.key});
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@override
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Widget build(BuildContext context) {
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return PlayerScreenBackground(
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enabled: settings.playerBackgroundOnLyrics,
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appBar: AppBar(
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title: Text('Lyrics'.i18n),
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systemOverlayStyle: PlayerScreenBackground.getSystemUiOverlayStyle(
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context,
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enabled: settings.playerBackgroundOnLyrics),
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backgroundColor: Colors.transparent,
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),
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child: const Column(
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children: [
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Expanded(child: LyricsWidget()),
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Divider(height: 1.0, thickness: 1.0),
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PlayerBar(backgroundColor: Colors.transparent),
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],
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));
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}
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}
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class LyricsWidget extends StatefulWidget {
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const LyricsWidget({Key? key}) : super(key: key);
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@override
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State<LyricsWidget> createState() => _LyricsWidgetState();
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}
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class _LyricsWidgetState extends State<LyricsWidget>
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with WidgetsBindingObserver {
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StreamSubscription? _mediaItemSub;
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StreamSubscription? _positionSub;
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int? _currentIndex = -1;
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Duration _nextOffset = Duration.zero;
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Duration _currentOffset = Duration.zero;
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String? _currentTrackId;
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final ScrollController _controller = ScrollController();
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static const double height = 110.0;
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static const double additionalTranslationHeight = 40.0;
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BoxConstraints? _widgetConstraints;
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Lyrics? _lyrics;
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bool _loading = true;
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CancelToken? _lyricsCancelToken;
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Object? _error;
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bool _freeScroll = false;
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bool _animatedScroll = false;
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bool _syncedLyrics = false;
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bool _showTranslation = false;
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bool _availableTranslation = false;
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Future<void> _loadForId(String trackId) async {
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if (_currentTrackId == trackId) return;
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_currentTrackId = trackId;
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print('cancelling req?');
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// cancel current request, if applicable
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_lyricsCancelToken?.cancel();
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_currentIndex = -1;
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_currentOffset = Duration.zero;
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_nextOffset = Duration.zero;
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//Fetch
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setState(() {
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_freeScroll = false;
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_loading = true;
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_lyrics = null;
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_error = null;
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});
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try {
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_lyricsCancelToken = CancelToken();
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final lyrics =
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await pipeAPI.lyrics(trackId, cancelToken: _lyricsCancelToken);
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if (lyrics == null) {
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setState(() {
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_error = 'No lyrics available.';
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});
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return;
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}
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_syncedLyrics = lyrics.sync;
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_availableTranslation = lyrics.lyrics![0].translated != null;
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if (!_availableTranslation) {
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_showTranslation = false;
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}
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if (!mounted) return;
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setState(() {
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_loading = false;
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_lyrics = lyrics;
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});
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SchedulerBinding.instance.addPostFrameCallback(
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(_) => _updatePosition(audioHandler.playbackState.value.position));
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} on DioException catch (e) {
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if (e.type != DioExceptionType.cancel) rethrow;
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} catch (e) {
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_currentTrackId = null;
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if (!mounted) return;
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setState(() {
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_error = e;
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});
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} finally {
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_lyricsCancelToken =
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null; // dispose of cancel token after lyrics are fetched.
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}
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}
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void _scrollToLyric() {
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if (!_controller.hasClients) return;
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//Lyric height, screen height, appbar height
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final actualHeight =
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height + (_showTranslation ? additionalTranslationHeight : 0.0);
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double scrollTo;
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if (_widgetConstraints == null) {
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scrollTo = (actualHeight * _currentIndex!) -
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(MediaQuery.of(context).size.height / 4 + height / 2);
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} else {
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final widgetHeight = _widgetConstraints!.maxHeight;
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final minScroll = actualHeight * _currentIndex!;
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scrollTo = minScroll - widgetHeight / 2 + height / 2;
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}
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if (scrollTo < 0.0) scrollTo = 0.0;
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if (scrollTo > _controller.position.maxScrollExtent) {
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scrollTo = _controller.position.maxScrollExtent;
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}
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_animatedScroll = true;
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_controller
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.animateTo(scrollTo,
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duration: const Duration(milliseconds: 250), curve: Curves.ease)
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.then((_) => _animatedScroll = false);
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}
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void _updatePosition(Duration position) {
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if (_loading) return;
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if (!_syncedLyrics) return;
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if (position < _nextOffset && position > _currentOffset) return;
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_currentIndex =
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_lyrics?.lyrics?.lastIndexWhere((l) => l.offset! <= position);
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if (_currentIndex! < 0) return;
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if (_currentIndex! < _lyrics!.lyrics!.length - 1) {
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// update nextOffset
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_nextOffset = _lyrics!.lyrics![_currentIndex! + 1].offset!;
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} else {
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// dummy position so that the before-hand condition always returns false
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_nextOffset = const Duration(days: 69);
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}
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_currentOffset = _lyrics!.lyrics![_currentIndex!].offset!;
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setState(() => _currentIndex);
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if (_freeScroll) return;
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_scrollToLyric();
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}
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void _makeSubscriptions() {
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if (_mediaItemSub != null || _positionSub != null) return;
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_positionSub = AudioService.position.listen(_updatePosition);
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/// Track change = reload new lyrics
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_mediaItemSub = audioHandler.mediaItem.listen((mediaItem) {
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if (mediaItem == null) return;
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if (_controller.hasClients) _controller.jumpTo(0.0);
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_loadForId(mediaItem.id);
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});
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}
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void _cancelSubscriptions() {
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_mediaItemSub?.cancel();
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_positionSub?.cancel();
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_mediaItemSub = null;
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_positionSub = null;
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}
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@override
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void initState() {
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SchedulerBinding.instance.addPostFrameCallback((_) {
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//Enable visualizer
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// if (settings.lyricsVisualizer) playerHelper.startVisualizer();
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_makeSubscriptions();
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});
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WidgetsBinding.instance.addObserver(this);
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super.initState();
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}
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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print('fuck? $state');
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switch (state) {
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case AppLifecycleState.paused:
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_cancelSubscriptions();
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break;
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case AppLifecycleState.resumed:
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_makeSubscriptions();
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break;
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default:
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break;
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}
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}
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@override
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void dispose() {
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WidgetsBinding.instance.removeObserver(this);
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_cancelSubscriptions();
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//Stop visualizer
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// if (settings.lyricsVisualizer) playerHelper.stopVisualizer();
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super.dispose();
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}
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ScrollBehavior get _scrollBehavior {
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if (_freeScroll) {
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return ScrollConfiguration.of(context);
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}
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return ScrollConfiguration.of(context).copyWith(scrollbars: false);
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}
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@override
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Widget build(BuildContext context) {
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return Stack(
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children: [
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Column(children: [
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if (_freeScroll && !_loading)
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Center(
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child: TextButton(
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onPressed: () {
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setState(() => _freeScroll = false);
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_scrollToLyric();
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},
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style: ButtonStyle(
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foregroundColor: MaterialStateProperty.all(Colors.white)),
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child: Text(
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_currentIndex! >= 0
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? (_lyrics?.lyrics?[_currentIndex!].text ?? '...')
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: '...',
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textAlign: TextAlign.center,
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)),
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),
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Expanded(
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child: _error != null
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?
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//Shouldn't really happen, empty lyrics have own text
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ErrorScreen(message: _error.toString())
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:
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// Loading lyrics
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_loading
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? const Center(child: CircularProgressIndicator())
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: LayoutBuilder(builder: (context, constraints) {
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_widgetConstraints = constraints;
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return NotificationListener<ScrollStartNotification>(
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onNotification:
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(ScrollStartNotification notification) {
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if (!_syncedLyrics) return false;
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final extentDiff =
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(notification.metrics.extentBefore -
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notification.metrics.extentAfter)
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.abs();
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// avoid accidental clicks
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const extentThreshold = 10.0;
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if (extentDiff >= extentThreshold &&
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!_animatedScroll &&
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!_loading &&
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!_freeScroll) {
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setState(() => _freeScroll = true);
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}
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return false;
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},
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child: ScrollConfiguration(
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behavior: _scrollBehavior,
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child: ListView.builder(
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padding: const EdgeInsets.symmetric(
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horizontal: 8.0),
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controller: _controller,
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itemExtent: !_syncedLyrics
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? null
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: height +
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(_showTranslation
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? additionalTranslationHeight
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: 0.0),
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itemCount: _lyrics!.lyrics!.length,
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itemBuilder: (BuildContext context, int i) {
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return DecoratedBox(
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decoration: BoxDecoration(
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borderRadius:
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BorderRadius.circular(8.0),
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color: _currentIndex == i
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? Colors.grey.withOpacity(0.25)
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: Colors.transparent,
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),
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child: InkWell(
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borderRadius:
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BorderRadius.circular(8.0),
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onTap: _syncedLyrics &&
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_lyrics!.id != null
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? () => audioHandler.seek(
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_lyrics!.lyrics![i].offset!)
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: null,
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child: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Text(
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_lyrics!.lyrics![i].text!,
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textAlign: _syncedLyrics
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? TextAlign.center
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: TextAlign.start,
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style: TextStyle(
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fontSize: _syncedLyrics
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? 26.0
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: 20.0,
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fontWeight:
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(_currentIndex == i)
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? FontWeight
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.bold
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: FontWeight
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.normal),
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),
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if (_showTranslation)
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Text(
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_lyrics!.lyrics![i]
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.translated!,
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textAlign:
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TextAlign.center,
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style: TextStyle(
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color: Color.lerp(
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Theme.of(
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context)
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.colorScheme
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.onBackground,
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Colors.black,
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0.12),
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fontSize: 20.0)),
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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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if (_availableTranslation)
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Align(
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alignment: Alignment.bottomCenter,
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child: Padding(
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padding: const EdgeInsets.only(bottom: 8.0),
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child: ElevatedButton(
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onPressed: () {
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setState(() => _showTranslation = !_showTranslation);
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SchedulerBinding.instance
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.addPostFrameCallback((_) => _scrollToLyric());
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},
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child: Text(_showTranslation
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? 'Without translation'.i18n
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: 'With translation'.i18n)),
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)),
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],
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);
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}
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}
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