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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 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; | |
| 27 | + | |
| 28 | +import sun.security.util.SecurityConstants; | |
| 29 | +/** | |
| 30 | + * <code>MouseInfo</code> provides methods for getting information about the mouse, | |
| 31 | + * such as mouse pointer location and the number of mouse buttons. | |
| 32 | + * | |
| 33 | + * @author Roman Poborchiy | |
| 34 | + * @since 1.5 | |
| 35 | + */ | |
| 36 | + | |
| 37 | +public class MouseInfo { | |
| 38 | + | |
| 39 | + /** | |
| 40 | + * Private constructor to prevent instantiation. | |
| 41 | + */ | |
| 42 | + private MouseInfo() { | |
| 43 | + } | |
| 44 | + | |
| 45 | + /** | |
| 46 | + * Returns a <code>PointerInfo</code> instance that represents the current | |
| 47 | + * location of the mouse pointer. | |
| 48 | + * The <code>GraphicsDevice</code> stored in this <code>PointerInfo</code> | |
| 49 | + * contains the mouse pointer. The coordinate system used for the mouse position | |
| 50 | + * depends on whether or not the <code>GraphicsDevice</code> is part of a virtual | |
| 51 | + * screen device. | |
| 52 | + * For virtual screen devices, the coordinates are given in the virtual | |
| 53 | + * coordinate system, otherwise they are returned in the coordinate system | |
| 54 | + * of the <code>GraphicsDevice</code>. See {@link GraphicsConfiguration} | |
| 55 | + * for more information about the virtual screen devices. | |
| 56 | + * On systems without a mouse, returns <code>null</code>. | |
| 57 | + * <p> | |
| 58 | + * If there is a security manager, its <code>checkPermission</code> method | |
| 59 | + * is called with an <code>AWTPermission("watchMousePointer")</code> | |
| 60 | + * permission before creating and returning a <code>PointerInfo</code> | |
| 61 | + * object. This may result in a <code>SecurityException</code>. | |
| 62 | + * | |
| 63 | + * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true | |
| 64 | + * @exception SecurityException if a security manager exists and its | |
| 65 | + * <code>checkPermission</code> method doesn't allow the operation | |
| 66 | + * @see GraphicsConfiguration | |
| 67 | + * @see SecurityManager#checkPermission | |
| 68 | + * @see java.awt.AWTPermission | |
| 69 | + * @return location of the mouse pointer | |
| 70 | + * @since 1.5 | |
| 71 | + */ | |
| 72 | + public static PointerInfo getPointerInfo() throws HeadlessException { | |
| 73 | + if (GraphicsEnvironment.isHeadless()) { | |
| 74 | + throw new HeadlessException(); | |
| 75 | + } | |
| 76 | + | |
| 77 | + SecurityManager security = System.getSecurityManager(); | |
| 78 | + if (security != null) { | |
| 79 | + security.checkPermission(SecurityConstants.AWT.WATCH_MOUSE_PERMISSION); | |
| 80 | + } | |
| 81 | + | |
| 82 | + Point point = new Point(0, 0); | |
| 83 | + int deviceNum = Toolkit.getDefaultToolkit().getMouseInfoPeer().fillPointWithCoords(point); | |
| 84 | + GraphicsDevice[] gds = GraphicsEnvironment.getLocalGraphicsEnvironment(). | |
| 85 | + getScreenDevices(); | |
| 86 | + PointerInfo retval = null; | |
| 87 | + if (areScreenDevicesIndependent(gds)) { | |
| 88 | + retval = new PointerInfo(gds[deviceNum], point); | |
| 89 | + } else { | |
| 90 | + for (int i = 0; i < gds.length; i++) { | |
| 91 | + GraphicsConfiguration gc = gds[i].getDefaultConfiguration(); | |
| 92 | + Rectangle bounds = gc.getBounds(); | |
| 93 | + if (bounds.contains(point)) { | |
| 94 | + retval = new PointerInfo(gds[i], point); | |
| 95 | + } | |
| 96 | + } | |
| 97 | + } | |
| 98 | + | |
| 99 | + return retval; | |
| 100 | + } | |
| 101 | + | |
| 102 | + private static boolean areScreenDevicesIndependent(GraphicsDevice[] gds) { | |
| 103 | + for (int i = 0; i < gds.length; i++) { | |
| 104 | + Rectangle bounds = gds[i].getDefaultConfiguration().getBounds(); | |
| 105 | + if (bounds.x != 0 || bounds.y != 0) { | |
| 106 | + return false; | |
| 107 | + } | |
| 108 | + } | |
| 109 | + return true; | |
| 110 | + } | |
| 111 | + | |
| 112 | + /** | |
| 113 | + * Returns the number of buttons on the mouse. | |
| 114 | + * On systems without a mouse, returns <code>-1</code>. | |
| 115 | + * | |
| 116 | + * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true | |
| 117 | + * @return number of buttons on the mouse | |
| 118 | + * @since 1.5 | |
| 119 | + */ | |
| 120 | + public static int getNumberOfButtons() throws HeadlessException { | |
| 121 | + if (GraphicsEnvironment.isHeadless()) { | |
| 122 | + throw new HeadlessException(); | |
| 123 | + } | |
| 124 | + Object prop = Toolkit.getDefaultToolkit(). | |
| 125 | + getDesktopProperty("awt.mouse.numButtons"); | |
| 126 | + if (prop instanceof Integer) { | |
| 127 | + return ((Integer)prop).intValue(); | |
| 128 | + } | |
| 129 | + | |
| 130 | + // This should never happen. | |
| 131 | + assert false : "awt.mouse.numButtons is not an integer property"; | |
| 132 | + return 0; | |
| 133 | + } | |
| 134 | + | |
| 135 | +} | |