Music Playback Controls and Now Playing Screen — Musynth

// Signature of the primary playback entry point
void playSong(
  SongModel song,
  PlaylistType type, {
  required String heroId,
  int? id,
  bool activateShuffle = false,
})

Theme(
  data: AppTheme.darkTheme.copyWith(
    textTheme: uiState.songPlayedTypography,
    colorScheme: ColorScheme.dark(
      primary: songPlayedThemeColor,
      onSurface: songPlayedThemeColor,
    ),
    iconButtonTheme: IconButtonThemeData(
      style: ButtonStyle(
        iconColor: WidgetStatePropertyAll(songPlayedThemeColor),
      ),
    ),
  ),
  child: /* screen body */,
)

void _whilePressed({
  required AudioPlayer audioPlayer,
  required int currentIndex,
  required int songDurationSeconds,
  required int goToSeconds,
}) async {
  if (_loopActive) return;
  _loopActive = true;

  // Wait before the first seek so a quick tap (skip to next/previous song)
  // doesn't trigger a scrub jump. Scrubbing only starts while held.
  await Future.delayed(const Duration(milliseconds: 500));

  while (_buttonPressed) {
    if (currentIndex != audioPlayer.currentIndex) {
      _buttonPressed = false;
      break;
    }

    // Read the live position so holding scrubs progressively.
    final secondsResult = audioPlayer.position.inSeconds + goToSeconds;

    if (secondsResult <= 0 || secondsResult >= songDurationSeconds) {
      _buttonPressed = false;
    }

    audioPlayer.seek(
      Duration(seconds: secondsResult.clamp(0, songDurationSeconds)),
    );
    await Future.delayed(const Duration(milliseconds: 500));
  }

  _loopActive = false;
}

ProgressBar(
  thumbGlowRadius: 16.0,
  thumbRadius: 8.0,
  barHeight: 3.0,
  progress: audioControlState.currentDuration,
  total: Duration(milliseconds: songPlayed.duration.nonNullValue()),
  onSeek: audioPlayer.seek,
)

final isFavoriteSong = context.select(
  (FavoritesCubit c) => c.state.isFavoriteSong(songPlayed.id),
);