1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package androidx.leanback.transition;
15
16import android.graphics.Rect;
17
18import androidx.annotation.RestrictTo;
19
20/**
21 * Class to get the epicenter of Transition.
22 * @hide
23 */
24@RestrictTo(RestrictTo.Scope.LIBRARY)
25public abstract class TransitionEpicenterCallback {
26
27    /**
28     * Implementers must override to return the epicenter of the Transition in screen
29     * coordinates.
30     *
31     * @param transition The transition for which the epicenter applies.
32     * @return The Rect region of the epicenter of <code>transition</code> or null if
33     * there is no epicenter.
34     */
35    public abstract Rect onGetEpicenter(Object transition);
36}
37