AsyncButton.icon constructor
const
AsyncButton.icon({})
Implementation
const AsyncButton.icon({ required this.icon, this.busyIcon, this.onPressed, this.color = Colors.grey, this.loadingColor, this.loadingBackgroundColor = Colors.grey, this.busyBuilder, Key? key}) :
type = AsyncButtonType.ICON,
text = null,
borderRadius = null,
elevation = 0,
assert(icon != null),
super(key: key);