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/*
* Copyright (C) 2022 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.window;
import android.annotation.NonNull;
import android.app.Activity;
import android.app.Dialog;
import android.view.View;
/**
* Interface for applications to register back animation callbacks along their custom back
* handling.
* <p>
* This allows the client to customize various back behaviors by overriding the corresponding
* callback methods.
* <p>
* Callback instances can be added to and removed from {@link OnBackInvokedDispatcher}, held
* by classes that implement {@link OnBackInvokedDispatcherOwner} (such as {@link Activity},
* {@link Dialog} and {@link View}).
* <p>
* When back is triggered, callbacks on the in-focus window are invoked in reverse order in which
* they are added within the same priority. Between different priorities, callbacks with higher
* priority are invoked first.
* <p>
* @see OnBackInvokedCallback
* @hide
*/
public interface OnBackAnimationCallback extends OnBackInvokedCallback {
/**
* Called when a back gesture has been started, or back button has been pressed down.
*
* @param backEvent An {@link BackEvent} object describing the progress event.
*/
default void onBackStarted(@NonNull BackEvent backEvent) {}
/**
* Called on back gesture progress.
*
* @param backEvent An {@link BackEvent} object describing the progress event.
*
* @see BackEvent
*/
default void onBackProgressed(@NonNull BackEvent backEvent) { }
/**
* Called when a back gesture or back button press has been cancelled.
*/
default void onBackCancelled() { }
}
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