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  */
14 package androidx.leanback.transition;
15 
16 import android.graphics.Rect;
17 
18 import androidx.annotation.RestrictTo;
19 
20 /**
21  * Class to get the epicenter of Transition.
22  * @hide
23  */
24 @RestrictTo(RestrictTo.Scope.LIBRARY)
25 public 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      */
onGetEpicenter(Object transition)35     public abstract Rect onGetEpicenter(Object transition);
36 }
37