1 /* 2 * Copyright (c) 1996, 2006, 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 import java.util.EventListener; 29 30 /** 31 * The listener interface for receiving container events. 32 * The class that is interested in processing a container event 33 * either implements this interface (and all the methods it 34 * contains) or extends the abstract <code>ContainerAdapter</code> class 35 * (overriding only the methods of interest). 36 * The listener object created from that class is then registered with a 37 * component using the component's <code>addContainerListener</code> 38 * method. When the container's contents change because a component 39 * has been added or removed, the relevant method in the listener object 40 * is invoked, and the <code>ContainerEvent</code> is passed to it. 41 * <P> 42 * Container events are provided for notification purposes ONLY; 43 * The AWT will automatically handle add and remove operations 44 * internally so the program works properly regardless of 45 * whether the program registers a {@code ContainerListener} or not. 46 * 47 * @see ContainerAdapter 48 * @see ContainerEvent 49 * @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/containerlistener.html">Tutorial: Writing a Container Listener</a> 50 * 51 * @author Tim Prinzing 52 * @author Amy Fowler 53 * @since 1.1 54 */ 55 public interface ContainerListener extends EventListener { 56 /** 57 * Invoked when a component has been added to the container. 58 */ 59 public void componentAdded(ContainerEvent e); 60 61 /** 62 * Invoked when a component has been removed from the container. 63 */ 64 public void componentRemoved(ContainerEvent e); 65 66 }