Dart Documentation › clean_data › ChangeValueNotificationsMixin

ChangeValueNotificationsMixin abstract class 

abstract class ChangeValueNotificationsMixin implements ChangeNotificationsMixin {
 Change _change;
 Change _changeSync;

 _clearChanges() {
   _change = null;
 }

 _clearChangesSync() {
   _changeSync = null;
 }

 _markChanged(dynamic oldValue, dynamic newValue) {
   Change change = new Change(oldValue, newValue);
   if(_changeSync == null) _changeSync = change.clone();
   else _changeSync.mergeIn(change);
   if(_change == null) _change = change.clone();
   else _change.mergeIn(change);
 }

 void _dispose(){
   _closeChangeStreams();
 }

}

Implements

ChangeNotificationsMixin

Properties

final Stream<dynamic> onBeforeAdd #

inherited from ChangeNotificationsMixin

Stream populated with DataMapView events before any data object is added.

Stream<dynamic> get onBeforeAdd {
 if(_onBeforeAddedController == null) {
   _onBeforeAddedController =
       new StreamController.broadcast(sync: true);
 }
 return _onBeforeAddedController.stream;
}

final Stream<dynamic> onBeforeRemove #

inherited from ChangeNotificationsMixin

Stream populated with DataMapView events before any data object is removed.

Stream<dynamic> get onBeforeRemove {
 if(_onBeforeRemovedController == null) {
   _onBeforeRemovedController =
       new StreamController.broadcast(sync: true);
 }
 return _onBeforeRemovedController.stream;
}

final Stream<ChangeSet> onChange #

inherited from ChangeNotificationsMixin

Stream populated with ChangeSet events whenever the collection or any of data object contained gets changed.

Stream<ChangeSet> get onChange {
 if(_onChangeController == null) {
   _onChangeController =
       new StreamController.broadcast();
 }
 return _onChangeController.stream;
}

final Stream<Map> onChangeSync #

inherited from ChangeNotificationsMixin

Stream populated with {'change': ChangeSet, 'author': dynamic} events synchronously at the moment when the collection or any data object contained gets changed.

Stream<Map> get onChangeSync => _onChangeSyncController.stream;