PropertyChangeConsumer<T extends PropertyChangeNotifier<S>, S extends Object> class

A widget-based listener for cases where a BuildContext is hard to access, or if you prefer this kind of API. To register the widget to be rebuilt only on specific property changes, provide a properties parameter. The type parameter T is the type of the PropertyChangeNotifier subclass. The type parameter S is the type of the properties to observe.

Access both the model value and the changed properties via the builder callback:

PropertyChangeConsumer<MyModel, String>(
   properties: ['foo', 'bar'],
   builder: (context, model, properties) {
     return Column(
       children: [
         Text('$properties were changed!'),
         RaisedButton(
           child: Text('Update foo'),
           onPressed: () {
             model.foo = DateTime.now().toString();
           },
         ),
         RaisedButton(
           child: Text('Update bar'),
           onPressed: () {
             model.bar = DateTime.now().toString();
           },
         ),
       ],
     );
   },
 );

See also:

 * [StringPropertyChangeConsumer], where the second generic type can be omitted
   for models that extend PropertyChangeNotifier<String>.
Inheritance

Constructors

PropertyChangeConsumer({Key? key, Iterable<S>? properties, required PropertyChangeBuilder<T, S> builder})
const

Properties

builder → PropertyChangeBuilder<T, S>
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
properties → Iterable<S>?
final
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}) → 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