DataListenerCondition<S> typedef

DataListenerCondition<S> = bool Function(Data<S> previous, Data<S> current)

Signature for the listenWhen function which takes the previous state and the current state and is responsible for returning a bool which determines whether or not to call DataWidgetListener of DataListener with the current state.

Implementation

typedef DataListenerCondition<S> = bool Function(
    Data<S> previous, Data<S> current);