BlocProvider<T extends StateStreamableSource<Object?>> class

Takes a Create function that is responsible for creating the Bloc or Cubit and a child which will have access to the instance via BlocProvider.of(context). It is used as a dependency injection (DI) widget so that a single instance of a Bloc or Cubit can be provided to multiple widgets within a subtree.

BlocProvider(
  create: (BuildContext context) => BlocA(),
  child: ChildA(),
);

It automatically handles closing the instance when used with Create. By default, Create is called only when the instance is accessed. To override this behavior, set lazy to false.

BlocProvider(
  lazy: false,
  create: (BuildContext context) => BlocA(),
  child: ChildA(),
);
Inheritance
Implemented types

Constructors

BlocProvider({required Create<T> create, Key? key, Widget? child, bool lazy = true})
Takes a Create function that is responsible for creating the Bloc or Cubit and a child which will have access to the instance via BlocProvider.of(context). It is used as a dependency injection (DI) widget so that a single instance of a Bloc or Cubit can be provided to multiple widgets within a subtree.
const
BlocProvider.value({required T value, Key? key, Widget? child})
Takes a value and a child which will have access to the value via BlocProvider.of(context). When BlocProvider.value is used, the Bloc or Cubit will not be automatically closed. As a result, BlocProvider.value should only be used for providing existing instances to new subtrees.
const

Properties

child Widget?
Widget which will have access to the Bloc or Cubit.
final
hashCode int
The hash code for this object.
no setterinherited
key Key?
Controls how one widget replaces another widget in the tree.
finalinherited
lazy bool
Whether the Bloc or Cubit should be created lazily. Defaults to true.
final
runtimeType Type
A representation of the runtime type of the object.
no setterinherited

Methods

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget.
inherited
buildWithChild(BuildContext context, Widget? child) Widget
A build method that receives an extra child parameter.
override
createElement() → SingleChildStatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
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

Static Methods

of<T extends StateStreamableSource<Object?>>(BuildContext context, {bool listen = false}) → T
Method that allows widgets to access a Bloc or Cubit instance as long as their BuildContext contains a BlocProvider instance.