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 android.support.v17.leanback.widget; 15 16 import android.view.View; 17 import android.view.ViewGroup; 18 import android.view.ViewParent; 19 20 /** 21 * @hide 22 */ 23 public class Util { 24 25 /** 26 * Returns true if child == parent or is descendant of the parent. 27 */ isDescendant(ViewGroup parent, View child)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 }