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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 | +/** |
| 29 | + * <code>MouseInfo</code> provides methods for getting information about the mouse, |
| 30 | + * such as mouse pointer location and the number of mouse buttons. |
| 31 | + * |
| 32 | + * @author Roman Poborchiy |
| 33 | + * @since 1.5 |
| 34 | + */ |
| 35 | + |
| 36 | +public class MouseInfo { |
| 37 | + |
| 38 | + /** |
| 39 | + * Private constructor to prevent instantiation. |
| 40 | + */ |
| 41 | + private MouseInfo() { |
| 42 | + } |
| 43 | + |
| 44 | + /** |
| 45 | + * Returns a <code>PointerInfo</code> instance that represents the current |
| 46 | + * location of the mouse pointer. |
| 47 | + * The <code>GraphicsDevice</code> stored in this <code>PointerInfo</code> |
| 48 | + * contains the mouse pointer. The coordinate system used for the mouse position |
| 49 | + * depends on whether or not the <code>GraphicsDevice</code> is part of a virtual |
| 50 | + * screen device. |
| 51 | + * For virtual screen devices, the coordinates are given in the virtual |
| 52 | + * coordinate system, otherwise they are returned in the coordinate system |
| 53 | + * of the <code>GraphicsDevice</code>. See {@link GraphicsConfiguration} |
| 54 | + * for more information about the virtual screen devices. |
| 55 | + * On systems without a mouse, returns <code>null</code>. |
| 56 | + * <p> |
| 57 | + * If there is a security manager, its <code>checkPermission</code> method |
| 58 | + * is called with an <code>AWTPermission("watchMousePointer")</code> |
| 59 | + * permission before creating and returning a <code>PointerInfo</code> |
| 60 | + * object. This may result in a <code>SecurityException</code>. |
| 61 | + * |
| 62 | + * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true |
| 63 | + * @exception SecurityException if a security manager exists and its |
| 64 | + * <code>checkPermission</code> method doesn't allow the operation |
| 65 | + * @see GraphicsConfiguration |
| 66 | + * @see SecurityManager#checkPermission |
| 67 | + * @see java.awt.AWTPermission |
| 68 | + * @return location of the mouse pointer |
| 69 | + * @since 1.5 |
| 70 | + */ |
| 71 | + public static PointerInfo getPointerInfo() throws HeadlessException { |
| 72 | + if (GraphicsEnvironment.isHeadless()) { |
| 73 | + throw new HeadlessException(); |
| 74 | + } |
| 75 | +// |
| 76 | +// SecurityManager security = System.getSecurityManager(); |
| 77 | +// if (security != null) { |
| 78 | +// security.checkPermission(SecurityConstants.AWT.WATCH_MOUSE_PERMISSION); |
| 79 | +// } |
| 80 | +// |
| 81 | + Point point = new Point(0, 0); |
| 82 | +// int deviceNum = Toolkit.getDefaultToolkit().getMouseInfoPeer().fillPointWithCoords(point); |
| 83 | +// GraphicsDevice[] gds = GraphicsEnvironment.getLocalGraphicsEnvironment(). |
| 84 | +// getScreenDevices(); |
| 85 | + PointerInfo retval = new PointerInfo(null, point); |
| 86 | +// if (areScreenDevicesIndependent(gds)) { |
| 87 | +// retval = new PointerInfo(gds[deviceNum], point); |
| 88 | +// } else { |
| 89 | +// for (int i = 0; i < gds.length; i++) { |
| 90 | +// GraphicsConfiguration gc = gds[i].getDefaultConfiguration(); |
| 91 | +// Rectangle bounds = gc.getBounds(); |
| 92 | +// if (bounds.contains(point)) { |
| 93 | +// retval = new PointerInfo(gds[i], point); |
| 94 | +// } |
| 95 | +// } |
| 96 | +// } |
| 97 | +// |
| 98 | + return retval; |
| 99 | + } |
| 100 | +// |
| 101 | +// private static boolean areScreenDevicesIndependent(GraphicsDevice[] gds) { |
| 102 | +// for (int i = 0; i < gds.length; i++) { |
| 103 | +// Rectangle bounds = gds[i].getDefaultConfiguration().getBounds(); |
| 104 | +// if (bounds.x != 0 || bounds.y != 0) { |
| 105 | +// return false; |
| 106 | +// } |
| 107 | +// } |
| 108 | +// return true; |
| 109 | +// } |
| 110 | +// |
| 111 | + /** |
| 112 | + * Returns the number of buttons on the mouse. |
| 113 | + * On systems without a mouse, returns <code>-1</code>. |
| 114 | + * |
| 115 | + * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true |
| 116 | + * @return number of buttons on the mouse |
| 117 | + * @since 1.5 |
| 118 | + */ |
| 119 | + public static int getNumberOfButtons() throws HeadlessException { |
| 120 | + if (GraphicsEnvironment.isHeadless()) { |
| 121 | + throw new HeadlessException(); |
| 122 | + } |
| 123 | + return 2; // SwingJS what the heck. No one has a 3-button mouse anymore |
| 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 | +} |
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