BlocListenerBase<C extends Cubit<S>, S> class

Base class for widgets that listen to state changes in a specified cubit.

A BlocListenerBase is stateful and maintains the state subscription. The type of the state and what happens with each state change is defined by sub-classes.



BlocListenerBase({Key key, BlocWidgetListener<S> listener, C cubit, Widget child, BlocListenerCondition<S> listenWhen})
Base class for widgets that listen to state changes in a specified cubit. [...]


child Widget
The widget which will be rendered as a descendant of the BlocListenerBase.
cubit → C
The cubit whose state will be listened to. Whenever the cubit's state changes, listener will be invoked.
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
listener BlocWidgetListener<S>
The BlocWidgetListener which will be called on every state change. This listener should be used for any code which needs to execute in response to a state change.
listenWhen BlocListenerCondition<S>
An optional listenWhen can be implemented for more granular control over when listener is called. listenWhen will be invoked on each cubit state change. listenWhen takes the previous state and current state and must return a bool which determines whether or not the listener function will be invoked. The previous state will be initialized to the state of the cubit when the BlocListener is initialized. listenWhen is optional and if omitted, it will default to true. [...]
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


createElement() SingleChildStatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
createState() SingleChildState<BlocListenerBase<C, S>>
Creates the mutable state for this widget at a given location in the tree. [...]
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toDiagnosticsNode({String name, DiagnosticsTreeStyle style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
toString({DiagnosticLevel minLevel =}) String
A string representation of this object. [...]
toStringDeep({String prefixLineOne = '', String prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
toStringShort() String
A short, textual description of this widget.


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