freezer/lib/ui/player_screen.dart

import 'dart:math';

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:audio_service/audio_service.dart';
import 'package:flutter/services.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:freezer/api/cache.dart';
import 'package:freezer/api/deezer.dart';
import 'package:freezer/api/download.dart';
import 'package:freezer/api/player.dart';
import 'package:freezer/settings.dart';
import 'package:freezer/translations.i18n.dart';
import 'package:freezer/ui/elements.dart';
import 'package:freezer/ui/lyrics.dart';
import 'package:freezer/ui/menu.dart';
import 'package:freezer/ui/settings_screen.dart';
import 'package:freezer/ui/tiles.dart';
import 'package:just_audio/just_audio.dart';
import 'package:marquee/marquee.dart';
import 'package:palette_generator/palette_generator.dart';

import 'cached_image.dart';
import '../api/definitions.dart';
import 'player_bar.dart';

import 'dart:ui';
import 'dart:convert';
import 'dart:async';

//Changing item in queue view and pressing back causes the pageView to skip song
bool pageViewLock = false;

//So can be updated when going back from lyrics
late Function updateColor;

class PlayerScreen extends StatefulWidget {
  static const _blurStrength = 50.0;

  @override
  _PlayerScreenState createState() => _PlayerScreenState();
}

class _PlayerScreenState extends State<PlayerScreen> {
  LinearGradient? _bgGradient;
  late StreamSubscription _mediaItemSub;
  late StreamSubscription _playerStateSub;
  ImageProvider? _blurImage;
  bool _wasConnected = true;

  //Calculate background color
  Future _updateColor() async {
    if (!settings.colorGradientBackground! && !settings.blurPlayerBackground!)
      return;
    final imageProvider = CachedNetworkImageProvider(
        audioHandler.mediaItem.value!.extras!['thumb'] ??
            audioHandler.mediaItem.value!.artUri as String);
    //BG Image
    if (settings.blurPlayerBackground!)
      setState(() => _blurImage = imageProvider);

    if (settings.colorGradientBackground!) {
      //Run in isolate
      PaletteGenerator palette =
          await PaletteGenerator.fromImageProvider(imageProvider);

      setState(() => _bgGradient = LinearGradient(
              begin: Alignment.topCenter,
              end: Alignment.bottomCenter,
              colors: [
                palette.dominantColor!.color.withOpacity(0.7),
                Color.fromARGB(0, 0, 0, 0)
              ],
              stops: [
                0.0,
                0.6
              ]));
    }
  }

  void _playbackStateChanged() {
    // if (audioHandler.mediaItem.value == null) {
    //   //playerHelper.startService();
    //   setState(() => _wasConnected = false);
    // } else if (!_wasConnected) setState(() => _wasConnected = true);
  }

  @override
  void initState() {
    Future.delayed(Duration(milliseconds: 600), _updateColor);
    _playbackStateChanged();
    _mediaItemSub = audioHandler.mediaItem.listen((event) {
      _playbackStateChanged();
      _updateColor();
    });
    _playerStateSub =
        audioHandler.playbackState.listen((_) => _playbackStateChanged());

    updateColor = this._updateColor;
    super.initState();
  }

  @override
  void dispose() {
    _mediaItemSub.cancel();
    _playerStateSub.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final hasBackground =
        settings.blurPlayerBackground! || settings.colorGradientBackground!;
    final color = hasBackground
        ? Colors.transparent
        : Theme.of(context).scaffoldBackgroundColor;
    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        statusBarColor: color,
        statusBarBrightness: Brightness.light,
        statusBarIconBrightness: Brightness.light,
        systemNavigationBarIconBrightness: Brightness.light,
        systemNavigationBarColor: color,
        systemNavigationBarDividerColor: color,
      ),
      child: Stack(
        children: [
          if (hasBackground)
            Positioned.fill(
              child: ImageFiltered(
                imageFilter: ImageFilter.blur(
                    sigmaX: PlayerScreen._blurStrength,
                    sigmaY: PlayerScreen._blurStrength,
                    tileMode: TileMode.mirror),
                child: DecoratedBox(
                  decoration: BoxDecoration(
                      gradient: _bgGradient,
                      image: _blurImage == null
                          ? null
                          : DecorationImage(
                              image: _blurImage!,
                              fit: BoxFit.cover,
                              colorFilter: ColorFilter.mode(
                                  Colors.white.withOpacity(0.5),
                                  BlendMode.dstATop))),
                ),
              ),
            ),
          Scaffold(
            backgroundColor: hasBackground ? Colors.transparent : null,
            body: _wasConnected
                ? SafeArea(
                    child: OrientationBuilder(
                      builder: (context, orientation) =>
                          orientation == Orientation.landscape
                              ? PlayerScreenHorizontal()
                              : PlayerScreenVertical(),
                    ),
                  )
                : Center(child: CircularProgressIndicator()),
          ),
        ],
      ),
    );
  }
}

//Landscape
class PlayerScreenHorizontal extends StatefulWidget {
  @override
  _PlayerScreenHorizontalState createState() => _PlayerScreenHorizontalState();
}

class _PlayerScreenHorizontalState extends State<PlayerScreenHorizontal> {
  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: <Widget>[
        Padding(
          padding: EdgeInsets.fromLTRB(16, 0, 16, 8),
          child: Container(
            width: ScreenUtil().setWidth(500),
            child: Stack(
              children: <Widget>[
                BigAlbumArt(),
              ],
            ),
          ),
        ),
        //Right side
        SizedBox(
          width: ScreenUtil().setWidth(500),
          child: Column(
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              Padding(
                  padding: EdgeInsets.fromLTRB(8, 16, 8, 0),
                  child: Container(
                    child: PlayerScreenTopRow(
                        textSize: ScreenUtil().setSp(24),
                        iconSize: ScreenUtil().setSp(36),
                        textWidth: ScreenUtil().setWidth(350),
                        short: true),
                  )),
              Column(
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                  Container(
                      height: ScreenUtil().setSp(50),
                      child: audioHandler
                                  .mediaItem.value!.displayTitle!.length >=
                              22
                          ? Marquee(
                              text: audioHandler.mediaItem.value!.displayTitle!,
                              style: TextStyle(
                                  fontSize: ScreenUtil().setSp(40),
                                  fontWeight: FontWeight.bold),
                              blankSpace: 32.0,
                              startPadding: 10.0,
                              accelerationDuration: Duration(seconds: 1),
                              pauseAfterRound: Duration(seconds: 2),
                            )
                          : Text(
                              audioHandler.mediaItem.value!.displayTitle!,
                              maxLines: 1,
                              overflow: TextOverflow.ellipsis,
                              style: TextStyle(
                                  fontSize: ScreenUtil().setSp(40),
                                  fontWeight: FontWeight.bold),
                            )),
                  const SizedBox(height: 4.0),
                  Text(
                    audioHandler.mediaItem.value!.displaySubtitle ?? '',
                    maxLines: 1,
                    textAlign: TextAlign.center,
                    overflow: TextOverflow.clip,
                    style: TextStyle(
                      fontSize: ScreenUtil().setSp(32),
                      color: Theme.of(context).primaryColor,
                    ),
                  ),
                ],
              ),
              Container(
                padding: EdgeInsets.symmetric(horizontal: 16.0),
                child: SeekBar(),
              ),
              PlaybackControls(ScreenUtil().setSp(60)),
              Padding(
                  padding: EdgeInsets.fromLTRB(8, 0, 8, 16),
                  child: Container(
                    padding: EdgeInsets.symmetric(horizontal: 2.0),
                    child: Row(
                      mainAxisSize: MainAxisSize.max,
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: <Widget>[
                        IconButton(
                          icon: Icon(
                            Icons.subtitles,
                            size: ScreenUtil().setWidth(32),
                            semanticLabel: "Lyrics".i18n,
                          ),
                          onPressed: () {
                            Navigator.of(context).push(MaterialPageRoute(
                                builder: (context) => LyricsScreen()));
                          },
                        ),
                        QualityInfoWidget(),
                        RepeatButton(ScreenUtil().setWidth(32)),
                        PlayerMenuButton()
                      ],
                    ),
                  ))
            ],
          ),
        )
      ],
    );
  }
}

//Portrait
class PlayerScreenVertical extends StatefulWidget {
  @override
  _PlayerScreenVerticalState createState() => _PlayerScreenVerticalState();
}

class _PlayerScreenVerticalState extends State<PlayerScreenVertical> {
  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
        Padding(
            padding: EdgeInsets.fromLTRB(30, 4, 16, 0),
            child: PlayerScreenTopRow()),
        Padding(
          padding: EdgeInsets.symmetric(horizontal: 16.0),
          child: SizedBox(
            child: BigAlbumArt(),
            width: min(MediaQuery.of(context).size.width,
                    MediaQuery.of(context).size.height) *
                0.9,
            height: min(MediaQuery.of(context).size.width,
                    MediaQuery.of(context).size.height) *
                0.9,
          ),
        ),
        const SizedBox(height: 4.0),
        Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Container(
                height: ScreenUtil().setSp(80),
                child: audioHandler.mediaItem.value!.displayTitle!.length >= 26
                    ? Marquee(
                        text: audioHandler.mediaItem.value!.displayTitle!,
                        style: TextStyle(
                            fontSize: ScreenUtil().setSp(64),
                            fontWeight: FontWeight.bold),
                        blankSpace: 32.0,
                        startPadding: 10.0,
                        accelerationDuration: Duration(seconds: 1),
                        pauseAfterRound: Duration(seconds: 2),
                      )
                    : Text(
                        audioHandler.mediaItem.value!.displayTitle!,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: TextStyle(
                            fontSize: ScreenUtil().setSp(64),
                            fontWeight: FontWeight.bold),
                      )),
            const SizedBox(height: 4),
            Text(
              audioHandler.mediaItem.value!.displaySubtitle ?? '',
              maxLines: 1,
              textAlign: TextAlign.center,
              overflow: TextOverflow.clip,
              style: TextStyle(
                fontSize: ScreenUtil().setSp(52),
                color: Theme.of(context).primaryColor,
              ),
            ),
          ],
        ),
        SeekBar(),
        PlaybackControls(ScreenUtil().setWidth(100)),
        Padding(
          padding: EdgeInsets.symmetric(vertical: 0, horizontal: 16.0),
          child: Row(
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              IconButton(
                icon: Icon(
                  Icons.subtitles,
                  size: ScreenUtil().setWidth(46),
                  semanticLabel: "Lyrics".i18n,
                ),
                onPressed: () async {
                  //Fix bottom buttons
                  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
                      systemNavigationBarColor:
                          settings.themeData!.bottomAppBarColor,
                      statusBarColor: Colors.transparent));

                  await Navigator.of(context).push(
                      MaterialPageRoute(builder: (context) => LyricsScreen()));

                  updateColor();
                },
              ),
              IconButton(
                icon: Icon(
                  Icons.file_download,
                  semanticLabel: "Download".i18n,
                ),
                onPressed: () async {
                  Track t = Track.fromMediaItem(audioHandler.mediaItem.value!);
                  if (await downloadManager.addOfflineTrack(t,
                          private: false,
                          context: context,
                          isSingleton: true) !=
                      false)
                    Fluttertoast.showToast(
                        msg: 'Downloads added!'.i18n,
                        gravity: ToastGravity.BOTTOM,
                        toastLength: Toast.LENGTH_SHORT);
                },
              ),
              QualityInfoWidget(),
              RepeatButton(ScreenUtil().setWidth(46)),
              PlayerMenuButton()
            ],
          ),
        )
      ],
    );
  }
}

class QualityInfoWidget extends StatefulWidget {
  @override
  _QualityInfoWidgetState createState() => _QualityInfoWidgetState();
}

class _QualityInfoWidgetState extends State<QualityInfoWidget> {
  String value = '';
  late StreamSubscription streamSubscription;

  //Load data from native
  void _load() async {
    if (audioHandler.mediaItem.value == null) return;
    Map? data = await DownloadManager.platform.invokeMethod(
        "getStreamInfo", {"id": audioHandler.mediaItem.value!.id});
    //N/A
    if (data == null) {
      setState(() => value = '');
      //If not show, try again later
      if (audioHandler.mediaItem.value!.extras!['show'] == null)
        Future.delayed(Duration(milliseconds: 200), _load);

      return;
    }
    //Update
    StreamQualityInfo info = StreamQualityInfo.fromJson(data);
    setState(() {
      value =
          '${info.format} ${info.bitrate(audioHandler.mediaItem.value!.duration)}kbps';
    });
  }

  @override
  void initState() {
    _load();
    streamSubscription = audioHandler.mediaItem.listen((event) async {
      _load();
    });
    super.initState();
  }

  @override
  void dispose() {
    streamSubscription.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return TextButton(
      child: Text(value),
      onPressed: () {
        Navigator.of(context)
            .push(MaterialPageRoute(builder: (context) => QualitySettings()));
      },
    );
  }
}

class PlayerMenuButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return IconButton(
      icon: Icon(
        Icons.more_vert,
        size: ScreenUtil().setWidth(46),
        semanticLabel: "Options".i18n,
      ),
      onPressed: () {
        final currentMediaItem = audioHandler.mediaItem.value!;
        Track t = Track.fromMediaItem(currentMediaItem);
        MenuSheet m = MenuSheet(context, navigateCallback: () {
          Navigator.of(context).pop();
        });
        if (currentMediaItem.extras!['show'] == null)
          m.defaultTrackMenu(t, options: [m.sleepTimer(), m.wakelock()]);
        else
          m.defaultShowEpisodeMenu(
              Show.fromJson(jsonDecode(currentMediaItem.extras!['show'])),
              ShowEpisode.fromMediaItem(currentMediaItem),
              options: [m.sleepTimer(), m.wakelock()]);
      },
    );
  }
}

class RepeatButton extends StatefulWidget {
  final double iconSize;
  RepeatButton(this.iconSize, {Key? key}) : super(key: key);

  @override
  _RepeatButtonState createState() => _RepeatButtonState();
}

class _RepeatButtonState extends State<RepeatButton> {
  // ignore: missing_return
  Icon get repeatIcon {
    switch (playerHelper.repeatType) {
      case LoopMode.off:
        return Icon(
          Icons.repeat,
          size: widget.iconSize,
          semanticLabel: "Repeat off".i18n,
        );
      case LoopMode.all:
        return Icon(
          Icons.repeat,
          color: Theme.of(context).primaryColor,
          size: widget.iconSize,
          semanticLabel: "Repeat".i18n,
        );
      case LoopMode.one:
        return Icon(
          Icons.repeat_one,
          color: Theme.of(context).primaryColor,
          size: widget.iconSize,
          semanticLabel: "Repeat one".i18n,
        );
    }
  }

  @override
  Widget build(BuildContext context) {
    return IconButton(
      icon: repeatIcon,
      onPressed: () async {
        await playerHelper.changeRepeat();
        setState(() {});
      },
    );
  }
}

class PlaybackControls extends StatefulWidget {
  final double iconSize;
  PlaybackControls(this.iconSize, {Key? key}) : super(key: key);

  @override
  _PlaybackControlsState createState() => _PlaybackControlsState();
}

class _PlaybackControlsState extends State<PlaybackControls> {
  Icon get libraryIcon {
    if (cache.checkTrackFavorite(
        Track.fromMediaItem(audioHandler.mediaItem.value!))) {
      return Icon(
        Icons.favorite,
        size: widget.iconSize * 0.64,
        semanticLabel: "Unlove".i18n,
      );
    }
    return Icon(
      Icons.favorite_border,
      size: widget.iconSize * 0.64,
      semanticLabel: "Love".i18n,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 8.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        mainAxisSize: MainAxisSize.max,
        children: [
          IconButton(
              icon: Icon(
                Icons.sentiment_very_dissatisfied,
                size: ScreenUtil().setWidth(46),
                semanticLabel: "Dislike".i18n,
              ),
              onPressed: () async {
                await deezerAPI.dislikeTrack(audioHandler.mediaItem.value!.id);
                if (playerHelper.queueIndex <
                    audioHandler.queue.value.length - 1) {
                  audioHandler.skipToNext();
                }
              }),
          PrevNextButton(widget.iconSize, prev: true),
          PlayPauseButton(widget.iconSize * 1.25),
          PrevNextButton(widget.iconSize),
          IconButton(
            icon: libraryIcon,
            onPressed: () async {
              if (cache.libraryTracks == null) cache.libraryTracks = [];

              if (cache.checkTrackFavorite(
                  Track.fromMediaItem(audioHandler.mediaItem.value!))) {
                //Remove from library
                setState(() => cache.libraryTracks!
                    .remove(audioHandler.mediaItem.value!.id));
                await deezerAPI
                    .removeFavorite(audioHandler.mediaItem.value!.id);
                await cache.save();
              } else {
                //Add
                setState(() =>
                    cache.libraryTracks!.add(audioHandler.mediaItem.value!.id));
                await deezerAPI
                    .addFavoriteTrack(audioHandler.mediaItem.value!.id);
                await cache.save();
              }
            },
          )
        ],
      ),
    );
  }
}

class BigAlbumArt extends StatefulWidget {
  @override
  _BigAlbumArtState createState() => _BigAlbumArtState();
}

class _BigAlbumArtState extends State<BigAlbumArt> {
  PageController _pageController = PageController(
    initialPage: playerHelper.queueIndex,
  );
  StreamSubscription? _currentItemSub;
  bool _animationLock = true;

  @override
  void initState() {
    _currentItemSub = audioHandler.mediaItem.listen((event) async {
      _animationLock = true;
      await _pageController.animateToPage(playerHelper.queueIndex,
          duration: Duration(milliseconds: 300), curve: Curves.easeInOut);
      _animationLock = false;
    });
    super.initState();
  }

  @override
  void dispose() {
    _currentItemSub?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onVerticalDragUpdate: (DragUpdateDetails details) {
        if (details.delta.dy > 16) {
          Navigator.of(context).pop();
        }
      },
      child: PageView(
        controller: _pageController,
        onPageChanged: (int index) {
          if (pageViewLock) {
            pageViewLock = false;
            return;
          }
          if (_animationLock) return;
          audioHandler.skipToQueueItem(index);
        },
        children: List.generate(
            audioHandler.queue.value.length,
            (i) => ZoomableImage(
                  url: audioHandler.queue.value[i].artUri.toString(),
                )),
      ),
    );
  }
}

//Top row containing QueueSource, queue...
class PlayerScreenTopRow extends StatelessWidget {
  final double? textSize;
  final double? iconSize;
  final double? textWidth;
  final bool? short;
  PlayerScreenTopRow(
      {this.textSize, this.iconSize, this.textWidth, this.short});

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: <Widget>[
        Container(
          width: this.textWidth ?? ScreenUtil().setWidth(800),
          child: Text(
            (short ?? false)
                ? (playerHelper.queueSource!.text ?? '')
                : 'Playing from:'.i18n +
                    ' ' +
                    (playerHelper.queueSource?.text ?? ''),
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
            textAlign: TextAlign.left,
            style: TextStyle(fontSize: this.textSize ?? ScreenUtil().setSp(38)),
          ),
        ),
        IconButton(
          icon: Icon(
            Icons.menu,
            semanticLabel: "Queue".i18n,
          ),
          iconSize: this.iconSize ?? ScreenUtil().setSp(52),
          splashRadius: this.iconSize ?? ScreenUtil().setWidth(52),
          onPressed: () => Navigator.of(context)
              .push(MaterialPageRoute(builder: (context) => QueueScreen())),
        ),
      ],
    );
  }
}

class SeekBar extends StatefulWidget {
  @override
  _SeekBarState createState() => _SeekBarState();
}

class _SeekBarState extends State<SeekBar> {
  bool _seeking = false;
  late StreamSubscription _subscription;
  final position = ValueNotifier<Duration>(Duration.zero);

  @override
  void initState() {
    _subscription = AudioService.position.listen((position) {
      if (_seeking) return; // user is seeking
      this.position.value = position;
    });
    super.initState();
  }

  @override
  void dispose() {
    _subscription.cancel();
    super.dispose();
  }

  double parseDuration(Duration position) {
    if (position > duration) return duration.inMilliseconds.toDouble();
    return position.inMilliseconds.toDouble();
  }

  //Duration to mm:ss
  String _timeString(Duration d) {
    return "${d.inMinutes}:${d.inSeconds.remainder(60).toString().padLeft(2, '0')}";
  }

  Duration get duration {
    if (audioHandler.mediaItem.value == null) return Duration.zero;
    return audioHandler.mediaItem.value!.duration!;
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Padding(
          padding: EdgeInsets.symmetric(horizontal: 24.0),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              ValueListenableBuilder<Duration>(
                  valueListenable: position,
                  builder: (context, value, _) => Text(
                        _timeString(value),
                        style: TextStyle(fontSize: ScreenUtil().setSp(35)),
                      )),
              StreamBuilder<MediaItem?>(
                  stream: audioHandler.mediaItem,
                  builder: (context, snapshot) => Text(
                        _timeString(snapshot.data?.duration ?? Duration.zero),
                        style: TextStyle(fontSize: ScreenUtil().setSp(35)),
                      )),
            ],
          ),
        ),
        ValueListenableBuilder<Duration>(
            valueListenable: position,
            builder: (context, value, _) => Slider(
                  focusNode: FocusNode(
                      canRequestFocus: false,
                      skipTraversal:
                          true), // Don't focus on Slider - it doesn't work (and not needed)
                  value: parseDuration(value),
                  max: duration.inMilliseconds.toDouble(),
                  onChangeStart: (double d) {
                    _seeking = true;
                    position.value = Duration(milliseconds: d.toInt());
                  },
                  onChanged: (double d) {
                    position.value = Duration(milliseconds: d.toInt());
                  },
                  onChangeEnd: (double d) {
                    _seeking = false;
                    audioHandler.seek(Duration(milliseconds: d.toInt()));
                  },
                )),
      ],
    );
  }
}

class QueueScreen extends StatefulWidget {
  @override
  _QueueScreenState createState() => _QueueScreenState();
}

class _QueueScreenState extends State<QueueScreen> {
  late StreamSubscription _queueSub;

  /// Basically a simple list that keeps itself synchronized with [AudioHandler.queue],
  /// so that the [ReorderableListView] is updated instanly (as it should be)
  List<MediaItem> _queueCache = [];

  @override
  void initState() {
    _queueCache = audioHandler.queue.value;
    _queueSub = audioHandler.queue.listen((newQueue) {
      print('got queue $newQueue');
      // avoid rebuilding if the cache has got the right update
      if (listEquals(_queueCache, newQueue)) return;
      setState(() => _queueCache = newQueue);
    });
    super.initState();
  }

  @override
  void dispose() {
    _queueSub.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: FreezerAppBar(
          'Queue'.i18n,
          actions: <Widget>[
            IconButton(
              icon: Icon(
                Icons.shuffle,
                semanticLabel: "Shuffle".i18n,
              ),
              onPressed: () async {
                await playerHelper.toggleShuffle();
                setState(() {});
              },
            )
          ],
        ),
        body: ReorderableListView.builder(
          onReorder: (int oldIndex, int newIndex) {
            if (oldIndex == playerHelper.queueIndex) return;
            setState(() => _queueCache.reorder(oldIndex, newIndex));
            playerHelper.reorder(oldIndex, newIndex);
          },
          itemCount: _queueCache.length,
          itemBuilder: (BuildContext context, int i) {
            Track track = Track.fromMediaItem(audioHandler.queue.value[i]);
            return Dismissible(
              key: Key(track.id),
              background: DecoratedBox(
                  decoration: BoxDecoration(color: Colors.red),
                  child: Align(
                      child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16.0),
                          child: Icon(Icons.delete)),
                      alignment: Alignment.centerLeft)),
              secondaryBackground: DecoratedBox(
                  decoration: BoxDecoration(color: Colors.red),
                  child: Align(
                      child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16.0),
                          child: Icon(Icons.delete)),
                      alignment: Alignment.centerRight)),
              onDismissed: (_) {
                audioHandler.removeQueueItemAt(i);
                setState(() => _queueCache.removeAt(i));
              },
              child: TrackTile(
                track,
                onTap: () {
                  pageViewLock = true;
                  audioHandler
                      .skipToQueueItem(i)
                      .then((value) => Navigator.of(context).pop());
                },
                key: Key(track.id),
              ),
            );
          },
        ));
  }
}