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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.databinding;
/**
* Observable classes provide a way in which data bound UI can be notified of changes.
* {@link ObservableList} and {@link ObservableMap} also provide the ability to notify when
* changes occur. ObservableField, ObservableParcelable, ObservableBoolean, ObservableByte,
* ObservableShort, ObservableInt, ObservableLong, ObservableFloat, and ObservableDouble provide
* a means by which properties may be notified without implementing Observable.
* <p>
* An Observable object should notify the {@link OnPropertyChangedCallback} whenever
* an observed property of the class changes.
* <p>
* The getter for an observable property should be annotated with {@link Bindable}.
* <p>
* Convenience class BaseObservable implements this interface and PropertyChangeRegistry
* can help classes that don't extend BaseObservable to implement the listener registry.
*/
public interface Observable {
/**
* Adds a callback to listen for changes to the Observable.
* @param callback The callback to start listening.
*/
void addOnPropertyChangedCallback(OnPropertyChangedCallback callback);
/**
* Removes a callback from those listening for changes.
* @param callback The callback that should stop listening.
*/
void removeOnPropertyChangedCallback(OnPropertyChangedCallback callback);
/**
* The callback that is called by Observable when an observable property has changed.
*/
abstract class OnPropertyChangedCallback {
/**
* Called by an Observable whenever an observable property changes.
* @param sender The Observable that is changing.
* @param propertyId The BR identifier of the property that has changed. The getter
* for this property should be annotated with {@link Bindable}.
*/
public abstract void onPropertyChanged(Observable sender, int propertyId);
}
}
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