in_build_method_after.dart

class SomeWidget extends ConsumerWidget {
  const SomeWidget({
    super.key,
  });
  
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final musicId = ref.watch(musicIdProvider);
    final volume = ref.watch(volumeProvider);
    
    Future<void> playMusic() async {
      final music = await searchMusic();
      // here can uses context, ref, musicId, and volume :)
    }
    
    Future<Music?> searchMusic() async {
      // search
    }
    
    return TextButton(
      onPressed: playMusic,
      child: Text('sample'),
    );
  }
}