ValueListenableProvider<T> class

Listens to a ValueListenable and exposes its current value.

This is useful for testing purposes, to easily simular a provider update:

testWidgets('example', (tester) async {
  // Create a ValueNotifier that tests will use to drive the application
  final counter = ValueNotifier(0);

  // Mount the application using ValueListenableProvider
  await tester.pumpWidget(
    ValueListenableProvider<int>.value(
      value: counter,
      child: MyApp(),
    ),
  );

  // Tests can now simulate a provider update by updating the notifier
  // then calling tester.pump()
  counter.value++;
  await tester.pump();
});

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• SingleChildStatelessWidget
• ValueListenableProvider

Constructors

ValueListenableProvider.value({Key? key, required ValueListenable<T> value, UpdateShouldNotify<T>? updateShouldNotify, Widget? child})

Listens to a ValueListenable and exposes its current value.

Properties

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

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

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, 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