BlocBuilderBase<B extends StateStreamable<S>, S> class abstract

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

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.

Inheritance
Implementers

Constructors

BlocBuilderBase({Key? key, B? bloc, BlocBuilderCondition<S>? buildWhen})
Base class for widgets that build themselves based on interaction with a specified bloc.
const

Properties

bloc → B?
The bloc that the BlocBuilderBase will interact with. If omitted, BlocBuilderBase will automatically perform a lookup using BlocProvider and the current BuildContext.
final
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 bloc 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 bloc when the BlocBuilder is initialized. buildWhen is optional and if omitted, it will default to true.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

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

Operators

operator ==(Object other) → bool
The equality operator.
inherited