Source Code Cross Referenced for MouseInfo.java in  » 6.0-JDK-Core » AWT » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.awt;
027
028        import sun.security.util.SecurityConstants;
029
030        /**
031         * <code>MouseInfo</code>  provides methods for getting information about the mouse,
032         * such as mouse pointer location and the number of mouse buttons.
033         *
034         * @version    1.9, 05/05/07
035         * @author     Roman Poborchiy
036         * @since 1.5
037         */
038
039        public class MouseInfo {
040
041            /**
042             * Private constructor to prevent instantiation.
043             */
044            private MouseInfo() {
045            }
046
047            /**
048             * Returns a <code>PointerInfo</code> instance that represents the current
049             * location of the mouse pointer.
050             * The <code>GraphicsDevice</code> stored in this <code>PointerInfo</code>
051             * contains the mouse pointer. The coordinate system used for the mouse position
052             * depends on whether or not the <code>GraphicsDevice</code> is part of a virtual
053             * screen device.
054             * For virtual screen devices, the coordinates are given in the virtual
055             * coordinate system, otherwise they are returned in the coordinate system
056             * of the <code>GraphicsDevice</code>. See {@link GraphicsConfiguration}
057             * for more information about the virtual screen devices.
058             * On systems without a mouse, returns <code>null</code>.
059             * <p>
060             * If there is a security manager, its <code>checkPermission</code> method
061             * is called with an <code>AWTPermission("watchMousePointer")</code>
062             * permission before creating and returning a <code>PointerInfo</code>
063             * object. This may result in a <code>SecurityException</code>.
064             *
065             * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
066             * @exception SecurityException if a security manager exists and its
067             *            <code>checkPermission</code> method doesn't allow the operation
068             * @see       GraphicsConfiguration
069             * @see       SecurityManager#checkPermission
070             * @see       java.awt.AWTPermission
071             * @return    location of the mouse pointer
072             * @since     1.5
073             */
074            public static PointerInfo getPointerInfo() throws HeadlessException {
075                if (GraphicsEnvironment.isHeadless()) {
076                    throw new HeadlessException();
077                }
078
079                SecurityManager security = System.getSecurityManager();
080                if (security != null) {
081                    security
082                            .checkPermission(SecurityConstants.WATCH_MOUSE_PERMISSION);
083                }
084
085                Point point = new Point(0, 0);
086                int deviceNum = Toolkit.getDefaultToolkit().getMouseInfoPeer()
087                        .fillPointWithCoords(point);
088                GraphicsDevice[] gds = GraphicsEnvironment
089                        .getLocalGraphicsEnvironment().getScreenDevices();
090                PointerInfo retval = null;
091                if (areScreenDevicesIndependent(gds)) {
092                    retval = new PointerInfo(gds[deviceNum], point);
093                } else {
094                    for (int i = 0; i < gds.length; i++) {
095                        GraphicsConfiguration gc = gds[i]
096                                .getDefaultConfiguration();
097                        Rectangle bounds = gc.getBounds();
098                        if (bounds.contains(point)) {
099                            retval = new PointerInfo(gds[i], point);
100                        }
101                    }
102                }
103
104                return retval;
105            }
106
107            private static boolean areScreenDevicesIndependent(
108                    GraphicsDevice[] gds) {
109                for (int i = 0; i < gds.length; i++) {
110                    Rectangle bounds = gds[i].getDefaultConfiguration()
111                            .getBounds();
112                    if (bounds.x != 0 || bounds.y != 0) {
113                        return false;
114                    }
115                }
116                return true;
117            }
118
119            /**
120             * Returns the number of buttons on the mouse.
121             * On systems without a mouse, returns <code>-1</code>.
122             *
123             * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
124             * @return number of buttons on the mouse
125             * @since 1.5
126             */
127            public static int getNumberOfButtons() throws HeadlessException {
128                if (GraphicsEnvironment.isHeadless()) {
129                    throw new HeadlessException();
130                }
131                Object prop = Toolkit.getDefaultToolkit().getDesktopProperty(
132                        "awt.mouse.numButtons");
133                if (prop instanceof  Integer) {
134                    return ((Integer) prop).intValue();
135                }
136
137                // This should never happen.
138                assert false : "awt.mouse.numButtons is not an integer property";
139                return 0;
140            }
141
142        }
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