1 /* 2 * Copyright (c) 1996, 2020, 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 mouse motion events. 30 * The methods in this class are empty. This class exists as 31 * convenience for creating listener objects. 32 * <P> 33 * Mouse motion events occur when a mouse is moved or dragged. 34 * (Many such events will be generated in a normal program. 35 * To track clicks and other mouse events, use the MouseAdapter.) 36 * <P> 37 * Extend this class to create a {@code MouseEvent} listener 38 * and override the methods for the events of interest. (If you implement the 39 * {@code MouseMotionListener} interface, you have to define all of 40 * the methods in it. This abstract class defines null methods for them 41 * all, so you can only have to define methods for events you care about.) 42 * <P> 43 * Create a listener object using the extended class and then register it with 44 * a component using the component's {@code addMouseMotionListener} 45 * method. When the mouse is moved or dragged, the relevant method in the 46 * listener object is invoked and the {@code MouseEvent} is passed to it. 47 * 48 * @author Amy Fowler 49 * 50 * @see MouseEvent 51 * @see MouseMotionListener 52 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html">Tutorial: Writing a Mouse Motion Listener</a> 53 * 54 * @since 1.1 55 */ 56 public abstract class MouseMotionAdapter implements MouseMotionListener { 57 58 /** 59 * Constructs a {@code MouseMotionAdapter}. 60 */ 61 protected MouseMotionAdapter() {} 62 63 /** 64 * Invoked when a mouse button is pressed on a component and then 65 * dragged. Mouse drag events will continue to be delivered to 66 * the component where the first originated until the mouse button is 67 * released (regardless of whether the mouse position is within the 68 * bounds of the component). 69 */ 70 public void mouseDragged(MouseEvent e) {} 71 72 /** 73 * Invoked when the mouse button has been moved on a component 74 * (with no buttons no down). 75 */ 76 public void mouseMoved(MouseEvent e) {} 77 }