| // 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.change_record; |
| |
| import 'package:observe/observe.dart'; |
| |
| |
| /// Records a change to an [Observable]. |
| // TODO(jmesserly): remove this type |
| abstract class ChangeRecord {} |
| |
| /// A change record to a field of an observable object. |
| class PropertyChangeRecord<T> extends ChangeRecord { |
| /// The object that changed. |
| final object; |
| |
| /// The name of the property that changed. |
| final Symbol name; |
| |
| /// The previous value of the property. |
| final T oldValue; |
| |
| /// The new value of the property. |
| final T newValue; |
| |
| PropertyChangeRecord(this.object, this.name, this.oldValue, this.newValue); |
| |
| String toString() => |
| '#<PropertyChangeRecord $name from: $oldValue to: $newValue>'; |
| } |