ReadonlyelementReadonlyeventProtected ReadonlysubscriptionsReadonlyviewProtectednotifyProtectedonHook for subclasses to perform work during load (e.g. ScaleBarCompat.refresh).
Optionalforce: booleanOptionalcallback: (widget: this) => void
Subclasses override to provide the event-name prefix used in load(), e.g.
"home"yields"home.loading"/"home.loaded".