freezer/lib/ui/player_bar.dart

import 'dart:async';

import 'package:audio_service/audio_service.dart';
import 'package:flutter/material.dart';
import 'package:freezer/settings.dart';
import 'package:freezer/translations.i18n.dart';

import '../api/player.dart';
import 'cached_image.dart';
import 'player_screen.dart';

class PlayerBar extends StatefulWidget {
  final bool shouldHandleClicks;
  const PlayerBar({Key? key, this.shouldHandleClicks = true}) : super(key: key);

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

class _PlayerBarState extends State<PlayerBar> {
  final double iconSize = 28;
  late StreamSubscription mediaItemSub;
  late bool _isNothingPlaying = audioHandler.mediaItem.value == null;

  double parsePosition(Duration position) {
    if (audioHandler.mediaItem.value == null) return 0.0;
    if (audioHandler.mediaItem.value!.duration!.inSeconds == 0)
      return 0.0; //Division by 0
    return position.inSeconds /
        audioHandler.mediaItem.value!.duration!.inSeconds;
  }

  @override
  void initState() {
    mediaItemSub = audioHandler.mediaItem.listen((playingItem) {
      if ((playingItem == null && !_isNothingPlaying) ||
          (playingItem != null && _isNothingPlaying))
        setState(() => _isNothingPlaying = playingItem == null);
    });
    super.initState();
  }

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

  bool _gestureRegistered = false;

  @override
  Widget build(BuildContext context) {
    var focusNode = FocusNode();
    return _isNothingPlaying
        ? const SizedBox()
        : GestureDetector(
            onHorizontalDragUpdate: (details) async {
              if (_gestureRegistered) return;
              final double sensitivity = 12.69;
              //Right swipe
              _gestureRegistered = true;
              if (details.delta.dx > sensitivity) {
                await audioHandler.skipToPrevious();
              }
              //Left
              if (details.delta.dx < -sensitivity) {
                await audioHandler.skipToNext();
              }
              _gestureRegistered = false;
              return;
            },
            child: Column(mainAxisSize: MainAxisSize.min, children: <Widget>[
              StreamBuilder<MediaItem?>(
                  stream: audioHandler.mediaItem,
                  builder: (context, snapshot) {
                    if (!snapshot.hasData) return const SizedBox();
                    final currentMediaItem = snapshot.data!;
                    return DecoratedBox(
                        // For Android TV: indicate focus by grey
                        decoration: BoxDecoration(
                            color: focusNode.hasFocus
                                ? Colors.black26
                                : Theme.of(context).bottomAppBarColor),
                        child: ListTile(
                            dense: true,
                            focusNode: focusNode,
                            contentPadding:
                                EdgeInsets.symmetric(horizontal: 8.0),
                            onTap: widget.shouldHandleClicks
                                ? () {
                                    Navigator.of(context).push(
                                        MaterialPageRoute(
                                            builder: (BuildContext context) =>
                                                PlayerScreen()));
                                  }
                                : null,
                            leading: CachedImage(
                              width: 50,
                              height: 50,
                              url: currentMediaItem.extras!['thumb'] ??
                                  audioHandler.mediaItem.value!.artUri
                                      as String?,
                            ),
                            title: Text(
                              currentMediaItem.displayTitle!,
                              overflow: TextOverflow.clip,
                              maxLines: 1,
                            ),
                            subtitle: Text(
                              currentMediaItem.displaySubtitle ?? '',
                              overflow: TextOverflow.clip,
                              maxLines: 1,
                            ),
                            trailing: IconTheme(
                              data: IconThemeData(
                                  color: settings.isDark
                                      ? Colors.white
                                      : Colors.grey[600]),
                              child: Row(
                                mainAxisSize: MainAxisSize.min,
                                children: <Widget>[
                                  PrevNextButton(
                                    iconSize,
                                    prev: true,
                                  ),
                                  PlayPauseButton(iconSize),
                                  PrevNextButton(iconSize)
                                ],
                              ),
                            )));
                  }),
              SizedBox(
                height: 3.0,
                child: StreamBuilder<Duration>(
                    stream: AudioService.position,
                    builder: (context, snapshot) {
                      return LinearProgressIndicator(
                        backgroundColor:
                            Theme.of(context).primaryColor.withOpacity(0.1),
                        value: parsePosition(snapshot.data ?? Duration.zero),
                      );
                    }),
              ),
            ]),
          );
  }
}

class PrevNextButton extends StatelessWidget {
  final double size;
  final bool prev;
  final bool hidePrev;
  PrevNextButton(this.size, {this.prev = false, this.hidePrev = false});

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<List<MediaItem?>>(
      stream: audioHandler.queue,
      builder: (context, snapshot) {
        if (!prev) {
          return IconButton(
            icon: Icon(
              Icons.skip_next,
              semanticLabel: "Play next".i18n,
            ),
            iconSize: size,
            onPressed:
                playerHelper.queueIndex == (snapshot.data ?? []).length - 1
                    ? null
                    : () => audioHandler.skipToNext(),
          );
        }
        final canGoPrev = playerHelper.queueIndex > 0;

        if (!canGoPrev && hidePrev)
          return const SizedBox(width: 0.0, height: 0.0);
        return IconButton(
          icon: Icon(
            Icons.skip_previous,
            semanticLabel: "Play previous".i18n,
          ),
          iconSize: size,
          onPressed: canGoPrev ? () => audioHandler.skipToPrevious() : null,
        );
      },
    );
  }
}

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

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

class _PlayPauseButtonState extends State<PlayPauseButton>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<double> _animation;

  @override
  void initState() {
    _controller =
        AnimationController(vsync: this, duration: Duration(milliseconds: 200));
    _animation = CurvedAnimation(parent: _controller, curve: Curves.easeInOut);
    super.initState();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: audioHandler.playbackState,
      builder: (context, snapshot) {
        //Animated icon by pato05
        bool _playing = audioHandler.playbackState.value.playing;
        if (_playing ||
            audioHandler.playbackState.value.processingState ==
                AudioProcessingState.ready) {
          if (_playing)
            _controller.forward();
          else
            _controller.reverse();

          return IconButton(
              icon: AnimatedIcon(
                icon: AnimatedIcons.play_pause,
                progress: _animation,
                semanticLabel: _playing ? "Pause".i18n : "Play".i18n,
              ),
              iconSize: widget.size,
              onPressed: _playing
                  ? () => audioHandler.pause()
                  : () => audioHandler.play());
        }

        switch (audioHandler.playbackState.value.processingState) {
          //Stopped/Error
          case AudioProcessingState.error:
          case AudioProcessingState.idle:
            return SizedBox(width: widget.size, height: widget.size);
          //Loading, connecting, rewinding...
          default:
            return SizedBox(
              width: widget.size,
              height: widget.size,
              child: const CircularProgressIndicator(),
            );
        }
      },
    );
  }
}