onStart method
Called at the exact moment the widget is allocated in memory. It uses an internal "callable" type, to avoid any @overrides in subclases. This method should be internal and is required to define the lifetime cycle of the subclass.
Implementation
// @protected
@mustCallSuper
@nonVirtual
void onStart() {
// _checkIfAlreadyConfigured();
if (_initialized) return;
tif();
_initialized = true;
}