BlocBuilder<Bloc extends StateStreamable<State>, State> class

BlocBuilder handles building a widget in response to new states. BlocBuilder is analogous to StreamBuilder but has simplified API to reduce the amount of boilerplate code needed as well as bloc-specific performance improvements. Please refer to BlocListener if you want to "do" anything in response to state changes such as navigation, showing a dialog, etc...

If the bloc parameter is omitted, BlocBuilder will automatically perform a lookup using BlocProvider and the current BuildContext.

BlocBuilder<BlocA, BlocAState>(
  builder: (context, state) {
  // return widget here based on BlocA's state
  }
)

Only specify the bloc if you wish to provide a bloc that is otherwise not accessible via BlocProvider and the current BuildContext.

BlocBuilder<BlocA, BlocAState>(
  bloc: blocA,
  builder: (context, state) {
  // return widget here based on BlocA's state
  }
)
Inheritance

Constructors

BlocBuilder.new({required BlocWidgetBuilder<State> builder, required Bloc bloc, BlocBuilderCondition<State>? buildWhen, Key? key})
BlocBuilder handles building a widget in response to new states. BlocBuilder is analogous to StreamBuilder but has simplified API to reduce the amount of boilerplate code needed as well as bloc-specific performance improvements. Please refer to BlocListener if you want to "do" anything in response to state changes such as navigation, showing a dialog, etc...
const

Properties

bloc → Bloc
{@macro flutter_bloc_side_effect_listener_base.bloc} Same as the 'bloc' property for BlocListener from flutter_bloc package.
final
builder → BlocWidgetBuilder<State>
Same as the 'builder' property for BlocListener from flutter_bloc package.
final
buildWhen → BlocBuilderCondition<State>?
Same as the 'buildWhen' property for BlocListener from flutter_bloc package.
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) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
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.
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, int wrapWidth = 65}) → 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