Source for gnu.java.awt.peer.qt.QtFontMetrics

   1: /* QtFontMetrics.java --
   2:    Copyright (C)  2005, 2006  Free Software Foundation, Inc.
   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 gnu.java.awt.peer.qt;
  39: 
  40: import java.awt.Font;
  41: import java.awt.FontMetrics;
  42: import java.awt.Graphics;
  43: import java.awt.geom.Rectangle2D;
  44: 
  45: public class QtFontMetrics extends FontMetrics
  46: {
  47: 
  48:   private long nativeObject;
  49:   private QtFontPeer peer;
  50: 
  51:   public QtFontMetrics( Font f )
  52:   {
  53:     super( f );
  54:     if(f.getPeer() == null || !(f.getPeer() instanceof QtFontPeer))
  55:       throw new IllegalArgumentException("Invalid Font object.");
  56:     peer = (QtFontPeer) f.getPeer();
  57:     init( peer );
  58:   }
  59: 
  60:   public QtFontMetrics( Font f, Graphics g )
  61:   {
  62:     super( f );
  63:     if(f.getPeer() == null || !(f.getPeer() instanceof QtFontPeer))
  64:       throw new IllegalArgumentException("Invalid Font object.");
  65:     if( !(g instanceof QtGraphics) )
  66:       throw new IllegalArgumentException("Invalid graphics object.");
  67:     peer = (QtFontPeer) f.getPeer();
  68:     initGraphics(peer, (QtGraphics)g );
  69:   }
  70: 
  71:   QtFontMetrics( QtFontPeer f, Graphics g )
  72:   {
  73:     super( null );
  74:     if( !(g instanceof QtGraphics) )
  75:       throw new IllegalArgumentException("Invalid graphics object.");
  76:     peer = f;
  77:     initGraphics(peer, (QtGraphics)g );
  78:   }
  79: 
  80:   public QtFontMetrics( QtFontPeer fp )
  81:   {
  82:     super( (Font)null );
  83:     peer = fp;
  84:     init( peer );
  85:   }
  86: 
  87:   private native void init(QtFontPeer fp);
  88: 
  89:   private native void initGraphics(QtFontPeer fp, QtGraphics g);
  90: 
  91:   private native void dispose();
  92: 
  93:   native Rectangle2D getStringBounds(String s);
  94: 
  95:   // ****************** Package private ***************************
  96: 
  97:   native boolean canDisplay( int c );
  98: 
  99:   // ****************** Public methods ****************************
 100: 
 101:   public native int getAscent();
 102: 
 103:   public native int getDescent();
 104: 
 105:   public native int getHeight();
 106: 
 107:   public native int getLeading();
 108: 
 109:   public native int getMaxAdvance();
 110: 
 111:   public native int charWidth(char c);
 112: 
 113:   public int charsWidth(char[] chars, int off, int len)
 114:   {
 115:     return stringWidth( new String(chars, off, len) );
 116:   }
 117: 
 118:   public native int stringWidth(String str);
 119: 
 120:   public Rectangle2D getStringBounds(String str, Graphics context)
 121:   {
 122:     QtFontMetrics fm = new QtFontMetrics(peer, context);
 123:     return fm.getStringBounds( str );
 124:   }
 125: }