1 /* 2 * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.awt.event; 27 28 /** 29 * An abstract adapter class for receiving ancestor moved and resized events. 30 * The methods in this class are empty. This class exists as a 31 * convenience for creating listener objects. 32 * <p> 33 * Extend this class and override the method for the event of interest. (If 34 * you implement the {@code HierarchyBoundsListener} interface, you have 35 * to define both methods in it. This abstract class defines null methods for 36 * them both, so you only have to define the method for the event you care 37 * about.) 38 * <p> 39 * Create a listener object using your class and then register it with a 40 * Component using the Component's {@code addHierarchyBoundsListener} 41 * method. When the hierarchy to which the Component belongs changes by 42 * resize or movement of an ancestor, the relevant method in the listener 43 * object is invoked, and the {@code HierarchyEvent} is passed to it. 44 * 45 * @author David Mendenhall 46 * @see HierarchyBoundsListener 47 * @see HierarchyEvent 48 * @since 1.3 49 */ 50 public abstract class HierarchyBoundsAdapter implements HierarchyBoundsListener 51 { 52 /** 53 * Constructs a {@code HierarchyBoundsAdapter}. 54 */ 55 protected HierarchyBoundsAdapter() {} 56 57 /** 58 * Called when an ancestor of the source is moved. 59 */ 60 public void ancestorMoved(HierarchyEvent e) {} 61 62 /** 63 * Called when an ancestor of the source is resized. 64 */ 65 public void ancestorResized(HierarchyEvent e) {} 66 }