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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 | } | ||