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}