decode method
Implementation
@override
ImageFit decode(dynamic value) {
  switch (value) {
    case 'fill':
      return ImageFit.fill;
    case 'contain':
      return ImageFit.contain;
    case 'cover':
      return ImageFit.cover;
    case 'fit_width':
      return ImageFit.fitWidth;
    case 'fit_height':
      return ImageFit.fitHeight;
    case 'none':
      return ImageFit.none;
    case 'scale_down':
      return ImageFit.scaleDown;
    default:
      throw MapperException.unknownEnumValue(value);
  }
}