toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (propertyState != null) 'propertyState': propertyState!,
if (solidFill != null) 'solidFill': solidFill!,
if (stretchedPictureFill != null)
'stretchedPictureFill': stretchedPictureFill!,
};