toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (altText != null) 'altText': altText!,
if (disabled != null) 'disabled': disabled!,
if (enabled != null) 'enabled': enabled!,
if (icon != null) 'icon': icon!,
if (label != null) 'label': label!,
if (onClick != null) 'onClick': onClick!,
};