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| 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 | +/** | |
| 29 | + * An abstract adapter class for receiving keyboard focus events. | |
| 30 | + * The methods in this class are empty. This class exists as | |
| 31 | + * convenience for creating listener objects. | |
| 32 | + * <P> | |
| 33 | + * Extend this class to create a <code>FocusEvent</code> listener | |
| 34 | + * and override the methods for the events of interest. (If you implement the | |
| 35 | + * <code>FocusListener</code> interface, you have to define all of | |
| 36 | + * the methods in it. This abstract class defines null methods for them | |
| 37 | + * all, so you can only have to define methods for events you care about.) | |
| 38 | + * <P> | |
| 39 | + * Create a listener object using the extended class and then register it with | |
| 40 | + * a component using the component's <code>addFocusListener</code> | |
| 41 | + * method. When the component gains or loses the keyboard focus, | |
| 42 | + * the relevant method in the listener object is invoked, | |
| 43 | + * and the <code>FocusEvent</code> is passed to it. | |
| 44 | + * | |
| 45 | + * @see FocusEvent | |
| 46 | + * @see FocusListener | |
| 47 | + * @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/focuslistener.html">Tutorial: Writing a Focus Listener</a> | |
| 48 | + * | |
| 49 | + * @author Carl Quinn | |
| 50 | + * @since 1.1 | |
| 51 | + */ | |
| 52 | +public abstract class FocusAdapter implements FocusListener { | |
| 53 | + /** | |
| 54 | + * Invoked when a component gains the keyboard focus. | |
| 55 | + */ | |
| 56 | + public void focusGained(FocusEvent e) {} | |
| 57 | + | |
| 58 | + /** | |
| 59 | + * Invoked when a component loses the keyboard focus. | |
| 60 | + */ | |
| 61 | + public void focusLost(FocusEvent e) {} | |
| 62 | +} | |