toMap method Null safety

Implementation

Map<String, dynamic> toMap() {
  return <String, dynamic>{
    'uid': uid,
    'roomId': roomId,
    'alternateImage': alternateImage,
    'x': x,
    'y': y,
    'w': w,
    'h': h,
    'zorder': zorder,
    'alpha': alpha,
    'streamType': streamType.value,
    'mediaType': mediaType.value,
    'renderMode': renderMode.value,
    'sourceCrop': sourceCrop.toMap()
  };
}