| /* |
| * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt.event; |
| |
| /** |
| * An abstract adapter class for receiving keyboard focus events. |
| * The methods in this class are empty. This class exists as |
| * convenience for creating listener objects. |
| * <P> |
| * Extend this class to create a {@code FocusEvent} listener |
| * and override the methods for the events of interest. (If you implement the |
| * {@code FocusListener} interface, you have to define all of |
| * the methods in it. This abstract class defines null methods for them |
| * all, so you can only have to define methods for events you care about.) |
| * <P> |
| * Create a listener object using the extended class and then register it with |
| * a component using the component's {@code addFocusListener} |
| * method. When the component gains or loses the keyboard focus, |
| * the relevant method in the listener object is invoked, |
| * and the {@code FocusEvent} is passed to it. |
| * |
| * @see FocusEvent |
| * @see FocusListener |
| * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/focuslistener.html">Tutorial: Writing a Focus Listener</a> |
| * |
| * @author Carl Quinn |
| * @since 1.1 |
| */ |
| public abstract class FocusAdapter implements FocusListener { |
| /** |
| * Invoked when a component gains the keyboard focus. |
| */ |
| public void focusGained(FocusEvent e) {} |
| |
| /** |
| * Invoked when a component loses the keyboard focus. |
| */ |
| public void focusLost(FocusEvent e) {} |
| } |