fltkeep-color_picker.dart

class LinearColorPicker extends StatelessWidget {
  Color _currColor(Note note) => note?.color ?? kDefaultNoteColor;

  @override
  Widget build(BuildContext context) {
    Note note = Provider.of<Note>(context);
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      child: Row(
        children: kNoteColors.map((color) => InkWell(
          child: Container(
            ...
            color: color,
            child: color == _currColor(note) ? const Icon(Icons.check) : null,
          ),
          onTap: () {
            if (color != _currColor(note)) {
              note.updateWith(color: color);
            }
          },
        )).toList(),
      ),
    );
  }  
}