1 /* 2 * Copyright (c) 1996, 2013, 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 component events. 32 * The class that is interested in processing a component event 33 * either implements this interface (and all the methods it 34 * contains) or extends the abstract <code>ComponentAdapter</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>addComponentListener</code> 38 * method. When the component's size, location, or visibility 39 * changes, the relevant method in the listener object is invoked, 40 * and the <code>ComponentEvent</code> is passed to it. 41 * <P> 42 * Component events are provided for notification purposes ONLY; 43 * The AWT will automatically handle component moves and resizes 44 * internally so that GUI layout works properly regardless of 45 * whether a program registers a <code>ComponentListener</code> or not. 46 * 47 * @see ComponentAdapter 48 * @see ComponentEvent 49 * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html">Tutorial: Writing a Component Listener</a> 50 * 51 * @author Carl Quinn 52 * @since 1.1 53 */ 54 public interface ComponentListener extends EventListener { 55 /** 56 * Invoked when the component's size changes. 57 */ 58 public void componentResized(ComponentEvent e); 59 60 /** 61 * Invoked when the component's position changes. 62 */ 63 public void componentMoved(ComponentEvent e); 64 65 /** 66 * Invoked when the component has been made visible. 67 */ 68 public void componentShown(ComponentEvent e); 69 70 /** 71 * Invoked when the component has been made invisible. 72 */ 73 public void componentHidden(ComponentEvent e); 74 }