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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 | } | ||