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/*
* Copyright (C) 2015 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;
/**
* Listener set on {@link ViewDataBinding#addOnRebindCallback(OnRebindCallback)} that
* is called when bound values must be reevaluated in {@link
* ViewDataBinding#executePendingBindings()}.
*/
public abstract class OnRebindCallback<T extends ViewDataBinding> {
/**
* Called when values in a ViewDataBinding should be reevaluated. This does not
* mean that values will actually change, but only that something in the data
* model that affects the bindings has been perturbed.
* <p>
* Return true to allow the reevaluation to happen or false if the reevaluation
* should be stopped. If false is returned, it is the responsibility of the
* OnRebindListener implementer to explicitly call {@link
* ViewDataBinding#executePendingBindings()}.
* <p>
* The default implementation only returns <code>true</code>.
*
* @param binding The ViewDataBinding that is reevaluating its bound values.
* @return true to indicate that the reevaluation should continue or false to
* halt evaluation.
*/
public boolean onPreBind(T binding) {
return true;
}
/**
* Called after all callbacks have completed {@link #onPreBind(ViewDataBinding)} when
* one or more of the calls has returned <code>false</code>.
* <p>
* The default implementation does nothing.
*
* @param binding The ViewDataBinding that is reevaluating its bound values.
*/
public void onCanceled(T binding) {
}
/**
* Called after values have been reevaluated in {@link
* ViewDataBinding#executePendingBindings()}. This is only called if all listeners have
* returned true from {@link #onPreBind(ViewDataBinding)}.
* <p>
* The default implementation does nothing.
*
* @param binding The ViewDataBinding that is reevaluating its bound values.
*/
public void onBound(T binding) {
}
}
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