toDocument method 
    
    
    
  Implementation
  @override
Map<String, Object?> toDocument() {
  final Map<String, dynamic>? colorMap =
      color != null ? color!.toDocument() : null;
  Map<String, Object?> theDocument = HashMap();
  if (fontName != null) {
    theDocument["fontName"] = fontName;
  } else {
    theDocument["fontName"] = null;
  }
  if (size != null) {
    theDocument["size"] = size;
  } else {
    theDocument["size"] = null;
  }
  if (weight != null) {
    theDocument["weight"] = weight;
  } else {
    theDocument["weight"] = null;
  }
  if (style != null) {
    theDocument["style"] = style;
  } else {
    theDocument["style"] = null;
  }
  if (decoration != null) {
    theDocument["decoration"] = decoration;
  } else {
    theDocument["decoration"] = null;
  }
  if (color != null) {
    theDocument["color"] = colorMap;
  } else {
    theDocument["color"] = null;
  }
  return theDocument;
}