onTransition method
Called whenever a transition
occurs with the given transition
.
A transition
occurs when a new event
is added
and a new state is emitted
from a corresponding EventHandler
.
onTransition is called before a Bloc
's state has been updated.
A great spot to add logging/analytics at the individual Bloc
level.
Note: super.onTransition
should always be called first.
@override
void onTransition(Transition<Event, State> transition) {
// Always call super.onTransition with the current transition
super.onTransition(transition);
// Custom onTransition logic goes here
}
See also:
BlocObserver.onTransition
for observing transitions globally.
Implementation
@override
void onTransition(Transition<LyFormEvent, LyFormState<D, E>> transition) {
super.onTransition(transition);
final state = transition.nextState;
if (state is LyFormPureState<D, E>) {
onPureState(state);
} else if (state is LyFormInvalidState<D, E>) {
onInvalidState(state);
} else if (state is LyFormValidState<D, E>) {
onValidState(state);
} else if (state is LyFormLoadingState<D, E>) {
onLoadingState(state);
} else if (state is LyFormSuccessState<D, E>) {
onSuccessState(state);
} else if (state is LyFormErrorState<D, E>) {
onErrorState(state);
}
}