001 /* MouseInfo.java -- utility methods for mice. 002 Copyright (C) 2006 Free Software Foundation 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.awt; 039 040 import gnu.java.awt.ClasspathToolkit; 041 import java.awt.peer.MouseInfoPeer; 042 043 /** 044 * MouseInfo is a class containing utility functions for mouse information. 045 * 046 * @author Sven de Marothy 047 * @since 1.5 048 */ 049 public class MouseInfo 050 { 051 private static MouseInfoPeer peer; 052 053 /** 054 * Returns a PointerInfo object containing information about the current 055 * location of the mouse pointer 056 * 057 * @throws HeadlessException if the current GraphicsEnvironment is headless. 058 * @return a PointerInfo object. 059 */ 060 public static PointerInfo getPointerInfo() throws HeadlessException 061 { 062 SecurityManager sm = System.getSecurityManager(); 063 if (sm != null) 064 sm.checkPermission( new AWTPermission("watchMousePointer") ); 065 066 if( GraphicsEnvironment.isHeadless() ) 067 throw new HeadlessException(); 068 069 if( peer == null ) 070 peer = Toolkit.getDefaultToolkit().getMouseInfoPeer(); 071 072 Point p = new Point(); 073 int screen = peer.fillPointWithCoords( p ); 074 075 GraphicsDevice[] gds = GraphicsEnvironment.getLocalGraphicsEnvironment(). 076 getScreenDevices(); 077 078 return new PointerInfo( gds[ screen ], p ); 079 } 080 081 /** 082 * Returns the number of mouse buttons, or -1 if no mouse is connected. 083 * (mentioned in the 1.5 release notes) 084 * 085 * @throws HeadlessException if the current GraphicsEnvironment is headless. 086 * @return an integer number of buttons. 087 */ 088 public static int getNumberOfButtons() throws HeadlessException 089 { 090 if( GraphicsEnvironment.isHeadless() ) 091 throw new HeadlessException(); 092 return ((ClasspathToolkit)Toolkit.getDefaultToolkit()). 093 getMouseNumberOfButtons(); 094 } 095 }