ValueListenableProvider<T> class Null safety

Listens to a ValueListenable and exposes its current value.

This is useful for testing purpose, 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

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. [...]
@nonVirtual, read-only, 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.
read-only, 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. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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. [...]
@nonVirtual, inherited