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

Base class for widgets that build themselves based on interaction with a specified cubit.

A BlocBuilderBase is stateful and maintains the state of the interaction so far. The type of the state and how it is updated with each interaction is defined by sub-classes.



BlocBuilderBase({Key key, C cubit, BlocBuilderCondition<S> buildWhen})
Base class for widgets that build themselves based on interaction with a specified cubit. [...]


buildWhen BlocBuilderCondition<S>
An optional buildWhen can be implemented for more granular control over how often BlocBuilder rebuilds. buildWhen should only be used for performance optimizations as it provides no security about the state passed to the builder function. buildWhen will be invoked on each cubit state change. buildWhen takes the previous state and current state and must return a bool which determines whether or not the builder function will be invoked. The previous state will be initialized to the state of the cubit when the BlocBuilder is initialized. buildWhen is optional and if omitted, it will default to true. [...]
cubit → C
The cubit that the BlocBuilderBase will interact with. If omitted, BlocBuilderBase will automatically perform a lookup using BlocProvider and the current BuildContext.
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
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


build(BuildContext context, S state) Widget
Returns a widget based on the BuildContext and current state.
createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
createState() State<BlocBuilderBase<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