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 android.support.v17.leanback.widget;
15
16import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
17
18import android.support.annotation.RestrictTo;
19import android.view.View;
20import android.view.ViewGroup;
21import android.view.ViewParent;
22
23/**
24 * @hide
25 */
26@RestrictTo(LIBRARY_GROUP)
27public class Util {
28
29    /**
30     * Returns true if child == parent or is descendant of the parent.
31     */
32    public static boolean isDescendant(ViewGroup parent, View child) {
33        while (child != null) {
34            if (child == parent) {
35                return true;
36            }
37            ViewParent p = child.getParent();
38            if (!(p instanceof View)) {
39                return false;
40            }
41            child = (View) p;
42        }
43        return false;
44    }
45}