blob: 5749890d161756b8615c2f8b9475335105897c2d [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
library observe.src.observable_box;
import 'package:observable/observable.dart';
import 'package:observe/observe.dart';
// TODO(jmesserly): should the property name be configurable?
// That would be more convenient.
/// An observable box that holds a value. Use this if you want to store a single
/// value. For other cases, it is better to use [AutoObservableList],
/// [AutoObservableMap], or a custom [AutoObservable] implementation based on
/// [AutoObservable]. The property name for changes is "value".
class ObservableBox<T> extends PropertyChangeNotifier {
T _value;
ObservableBox([T initialValue]) : _value = initialValue;
T get value => _value;
void set value(T newValue) {
_value = notifyPropertyChange(#value, _value, newValue);
String toString() => '#<$runtimeType value: $value>';