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