BlocProvider<B extends Bloc> class

Widget that responsible to create the Bloc with help of create function. Accepts any Widget as child and provides the ability for child to obtain the Bloc.

Function shouldNotify define whether that widgets that inherit from this widget should be rebuilt if Bloc was changed.

BlocProvider could subscribe on Bloc.navigationStream and receives navigation events if router function will be defined, similar as RouteListener.

class CounterScreen extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return BlocProvider<CounterBloc>(
      routerPrecondition: (prevSettings, settings) => (settings.arguments as int) % 5 == 0,
      create: () => CounterBloc(),
      child: CounterLayout(title: 'Bloc Demo Home Page'),
      router: (context, name, args) {
        return showDialog(
            context: context,
            builder: (_) {
              return WillPopScope(
                  child: AlertDialog(
                    title: Text('Congratulations! You clicked $args times'),
                  ),
                  onWillPop: () async {
                    Navigator.of(context).pop('Dialog with $args clicks has been closed');
                    return false;
                  }
              );
            }
        );
      },
    );
  }
}

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• BlocProvider

Constructors

BlocProvider({Key? key, required Widget child, required B create(), BlocRouter? router, UpdateShouldNotify<B>? shouldNotify, Precondition<RouteData>? routerPrecondition})

const

Properties

child → Widget

final

create → B Function()

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

precondition → Precondition<RouteData>?

final, inherited

router → BlocRouter?

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

shouldNotify → UpdateShouldNotify<B>?

final

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → _BlocProviderState<B>

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.

inherited

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