Implement Model-Driven-Views spec for Dart

pkg/observe/lib/observe.dart

Index: pkg/observe/lib/observe.dart
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+// 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.
+
+/**
+ * *Warning*: this library is experimental, and APIs are subject to change.
+ *
+ * This library is used to observe changes to [Observable] types. It also
+ * has helpers to implement [Observable] objects.
+ *
+ * For example:
+ *
+ *     class Monster extends Object with ObservableMixin {
+ *       static const _HEALTH = const Symbol('health');
+ *
+ *       int _health = 100;
+ *       get health => _health;
+ *       set health(value) {
+ *         _health = notifyChange(_HEALTH, _health, value);
+ *       }
+ *
+ *       void damage(int amount) {
+ *         print('$this takes $amount damage!');
+ *         health -= amount;
+ *       }
+ *
+ *       toString() => 'Monster with $health hit points';
+ *
+ *       // These methods are temporary until dart2js supports mirrors.
+ *       getValueWorkaround(key) {
+ *         if (key == _HEALTH) return health;
+ *         return null;
+ *       }
+ *       setValueWorkaround(key, val) {
+ *         if (key == _HEALTH) health = val;
+ *       }
+ *     }
+ *
+ *     main() {
+ *       var obj = new Monster();
+ *       obj.changes.listen((records) {
+ *         print('Changes to $obj were: $records');
+ *       });
+ *       // Schedules asynchronous delivery of these changes
+ *       obj.damage(10);
+ *       obj.damage(20);
+ *       print('done!');
+ *     }
+ */
+library observe;
+
+// Import the observe implementation library. It contains the types that are
+// required to implement Model-Driven-Views in dart:html. Use package:observe
+// (this package) if you need this functionality
+// DO NOT import observe_impl in your code; it may break unpredictably.
+import 'dart:observe_impl';
+
+// Re-export the observe implementation
+export 'dart:observe_impl';
+
+part 'src/observable_box.dart';
+part 'src/observable_list.dart';
+part 'src/observable_map.dart';