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

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 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.
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