Source for java.awt.MouseInfo

   1: /* MouseInfo.java -- utility methods for mice.
   2:    Copyright (C) 2006 Free Software Foundation
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package java.awt;
  39: 
  40: import gnu.java.awt.ClasspathToolkit;
  41: import java.awt.peer.MouseInfoPeer;
  42: 
  43: /**
  44:  * MouseInfo is a class containing utility functions for mouse information.
  45:  *
  46:  * @author Sven de Marothy
  47:  * @since 1.5
  48:  */
  49: public class MouseInfo
  50: {
  51:   private static MouseInfoPeer peer;
  52: 
  53:   /**
  54:    * Private constructor to prevent instance creation.
  55:    */
  56:   private MouseInfo()
  57:   {
  58:   }
  59: 
  60:   /**
  61:    * Returns a PointerInfo object containing information about the current
  62:    * location of the mouse pointer
  63:    *
  64:    * @throws HeadlessException if the current GraphicsEnvironment is headless.
  65:    * @return a PointerInfo object.
  66:    */
  67:   public static PointerInfo getPointerInfo() throws HeadlessException
  68:   {
  69:     SecurityManager sm = System.getSecurityManager();
  70:     if (sm != null)
  71:       sm.checkPermission( new AWTPermission("watchMousePointer") );
  72: 
  73:     if( GraphicsEnvironment.isHeadless() )
  74:       throw new HeadlessException();
  75: 
  76:     if( peer == null )
  77:       peer = Toolkit.getDefaultToolkit().getMouseInfoPeer();
  78: 
  79:     Point p = new Point();
  80:     int screen = peer.fillPointWithCoords( p );
  81: 
  82:     GraphicsDevice[] gds = GraphicsEnvironment.getLocalGraphicsEnvironment().
  83:       getScreenDevices();
  84: 
  85:     return new PointerInfo( gds[ screen ], p );
  86:   }
  87: 
  88:   /**
  89:    * Returns the number of mouse buttons, or -1 if no mouse is connected.
  90:    * (mentioned in the 1.5 release notes)
  91:    *
  92:    * @throws HeadlessException if the current GraphicsEnvironment is headless.
  93:    * @return an integer number of buttons.
  94:    */
  95:   public static int getNumberOfButtons() throws HeadlessException
  96:   {
  97:     if( GraphicsEnvironment.isHeadless() )
  98:       throw new HeadlessException();
  99:     return ((ClasspathToolkit)Toolkit.getDefaultToolkit()).
 100:       getMouseNumberOfButtons();
 101:   }
 102: }