BlocObserver class Null safety

An interface for observing the behavior of Bloc instances.

Constructors

BlocObserver()

Properties

hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
onChange(BlocBase bloc, Change change) → void
Called whenever a Change occurs in any bloc A change occurs when a new state is emitted. onChange is called before a bloc's state has been updated.
onClose(BlocBase bloc) → void
Called whenever a Bloc is closed. onClose is called just before the Bloc is closed and indicates that the particular instance will no longer emit new states.
onCreate(BlocBase bloc) → void
Called whenever a Bloc is instantiated. In many cases, a cubit may be lazily instantiated and onCreate can be used to observe exactly when the cubit instance is created.
onError(BlocBase bloc, Object error, StackTrace stackTrace) → void
Called whenever an error is thrown in any Bloc or Cubit. The stackTrace argument may be StackTrace.empty if an error was received without a stack trace.
onEvent(Bloc bloc, Object? event) → void
Called whenever an event is added to any bloc with the given bloc and event.
onTransition(Bloc bloc, Transition transition) → void
Called whenever a transition occurs in any bloc with the given bloc and 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.
toString() String
A string representation of this object. [...]
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited