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observe/lib/src/observable.dart

Index: observe/lib/src/observable.dart
diff --git a/observe/lib/src/observable.dart b/observe/lib/src/observable.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.
-
-library observe.src.observable;
-
-import 'dart:async';
-import 'dart:collection';
-
-import 'package:smoke/smoke.dart' as smoke;
-import 'package:observe/observe.dart';
-
-// Note: this is an internal library so we can import it from tests.
-// TODO(jmesserly): ideally we could import this with a prefix, but it caused
-// strange problems on the VM when I tested out the dirty-checking example
-// above.
-import 'dirty_check.dart';
-
-/// Represents an object with observable properties. This is used by data in
-/// model-view architectures to notify interested parties of [changes] to the
-/// object's properties (fields or getter/setter pairs).
-///
-/// The interface does not require any specific technique to implement
-/// observability. You can implement it in the following ways:
-///
-/// - extend or mixin this class, and let the application call [dirtyCheck]
-///   periodically to check for changes to your object.
-/// - extend or mixin [ChangeNotifier], and implement change notifications
-///   manually by calling [notifyPropertyChange] from your setters.
-/// - implement this interface and provide your own implementation.
-abstract class Observable {
-  /// Performs dirty checking of objects that inherit from [Observable].
-  /// This scans all observed objects using mirrors and determines if any fields
-  /// have changed. If they have, it delivers the changes for the object.
-  static void dirtyCheck() => dirtyCheckObservables();
-
-  StreamController _changes;
-
-  Map<Symbol, Object> _values;
-  List<ChangeRecord> _records;
-
-  /// The stream of change records to this object. Records will be delivered
-  /// asynchronously.
-  ///
-  /// [deliverChanges] can be called to force synchronous delivery.
-  Stream<List<ChangeRecord>> get changes {
-    if (_changes == null) {
-      _changes = new StreamController.broadcast(sync: true,
-          onListen: _observed, onCancel: _unobserved);
-    }
-    return _changes.stream;
-  }
-
-  /// True if this object has any observers, and should call
-  /// [notifyChange] for changes.
-  bool get hasObservers => _changes != null && _changes.hasListener;
-
-  void _observed() {
-    // Register this object for dirty checking purposes.
-    registerObservable(this);
-
-    var values = new Map<Symbol, Object>();
-
-    // Note: we scan for @observable regardless of whether the base type
-    // actually includes this mixin. While perhaps too inclusive, it lets us
-    // avoid complex logic that walks "with" and "implements" clauses.
-    var queryOptions = new smoke.QueryOptions(includeInherited: true,
-        includeProperties: false, withAnnotations: const [ObservableProperty]);
-    for (var decl in smoke.query(this.runtimeType, queryOptions)) {
-      var name = decl.name;
-      // Note: since this is a field, getting the value shouldn't execute
-      // user code, so we don't need to worry about errors.
-      values[name] = smoke.read(this, name);
-    }
-
-    _values = values;
-  }
-
-  /// Release data associated with observation.
-  void _unobserved() {
-    // Note: we don't need to explicitly unregister from the dirty check list.
-    // This will happen automatically at the next call to dirtyCheck.
-    if (_values != null) {
-      _values = null;
-    }
-  }
-
-  /// Synchronously deliver pending [changes]. Returns true if any records were
-  /// delivered, otherwise false.
-  // TODO(jmesserly): this is a bit different from the ES Harmony version, which
-  // allows delivery of changes to a particular observer:
-  // http://wiki.ecmascript.org/doku.php?id=harmony:observe#object.deliverchangerecords
-  //
-  // The rationale for that, and for async delivery in general, is the principal
-  // that you shouldn't run code (observers) when it doesn't expect to be run.
-  // If you do that, you risk violating invariants that the code assumes.
-  //
-  // For this reason, we need to match the ES Harmony version. The way we can do
-  // this in Dart is to add a method on StreamSubscription (possibly by
-  // subclassing Stream* types) that immediately delivers records for only
-  // that subscription. Alternatively, we could consider using something other
-  // than Stream to deliver the multicast change records, and provide an
-  // Observable->Stream adapter.
-  //
-  // Also: we should be delivering changes to the observer (subscription) based
-  // on the birth order of the observer. This is for compatibility with ES
-  // Harmony as well as predictability for app developers.
-  bool deliverChanges() {
-    if (_values == null || !hasObservers) return false;
-
-    // Start with manually notified records (computed properties, etc),
-    // then scan all fields for additional changes.
-    List records = _records;
-    _records = null;
-
-    _values.forEach((name, oldValue) {
-      var newValue = smoke.read(this, name);
-      if (oldValue != newValue) {
-        if (records == null) records = [];
-        records.add(new PropertyChangeRecord(this, name, oldValue, newValue));
-        _values[name] = newValue;
-      }
-    });
-
-    if (records == null) return false;
-
-    _changes.add(new UnmodifiableListView<ChangeRecord>(records));
-    return true;
-  }
-
-  /// Notify that the field [name] of this object has been changed.
-  ///
-  /// The [oldValue] and [newValue] are also recorded. If the two values are
-  /// equal, no change will be recorded.
-  ///
-  /// For convenience this returns [newValue].
-  notifyPropertyChange(Symbol field, Object oldValue, Object newValue)
-      => notifyPropertyChangeHelper(this, field, oldValue, newValue);
-
-  /// Notify observers of a change.
-  ///
-  /// For most objects [Observable.notifyPropertyChange] is more convenient, but
-  /// collections sometimes deliver other types of changes such as a
-  /// [ListChangeRecord].
-  ///
-  /// Notes:
-  /// - This is *not* required for fields if you mixin or extend [Observable],
-  ///   but you can use it for computed properties.
-  /// - Unlike [ChangeNotifier] this will not schedule [deliverChanges]; use
-  ///   [Observable.dirtyCheck] instead.
-  void notifyChange(ChangeRecord record) {
-    if (!hasObservers) return;
-
-    if (_records == null) _records = [];
-    _records.add(record);
-  }
-}
-
-// TODO(jmesserly): remove the instance method and make this top-level method
-// public instead?
-// NOTE: this is not exported publically.
-notifyPropertyChangeHelper(Observable obj, Symbol field, Object oldValue,
-    Object newValue) {
-
-  if (obj.hasObservers && oldValue != newValue) {
-    obj.notifyChange(new PropertyChangeRecord(obj, field, oldValue, newValue));
-  }
-  return newValue;
-}