1 /* GdkFontMetrics.java 2 Copyright (C) 1999, 2002, 2004, 2005 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 39 package gnu.java.awt.peer.gtk; 40 41 import gnu.java.awt.ClasspathToolkit; 42 43 import java.awt.Font; 44 import java.awt.FontMetrics; 45 import java.awt.Toolkit; 46 47 public class GdkFontMetrics extends FontMetrics 48 { 49 50 private int[] font_metrics; 51 GdkFontPeer peer; 52 53 static final int FONT_METRICS_ASCENT = 0; 54 static final int FONT_METRICS_MAX_ASCENT = 1; 55 static final int FONT_METRICS_DESCENT = 2; 56 static final int FONT_METRICS_MAX_DESCENT = 3; 57 static final int FONT_METRICS_MAX_ADVANCE = 4; 58 59 static final int TEXT_METRICS_X_BEARING = 0; 60 static final int TEXT_METRICS_Y_BEARING = 1; 61 static final int TEXT_METRICS_WIDTH = 2; 62 static final int TEXT_METRICS_HEIGHT = 3; 63 static final int TEXT_METRICS_X_ADVANCE = 4; 64 static final int TEXT_METRICS_Y_ADVANCE = 5; 65 66 /** 67 * Makes sure to return a Font based on the given Font that has as 68 * peer a GdkFontPeer. Used in the initializer. 69 */ initFont(Font font)70 private static Font initFont(Font font) 71 { 72 if (font == null) 73 return new Font("Dialog", Font.PLAIN, 12); 74 else if (font.getPeer() instanceof GdkFontPeer) 75 return font; 76 else 77 { 78 ClasspathToolkit toolkit; 79 toolkit = (ClasspathToolkit) Toolkit.getDefaultToolkit(); 80 return toolkit.getFont(font.getName(), font.getAttributes()); 81 } 82 } 83 GdkFontMetrics(Font font)84 public GdkFontMetrics (Font font) 85 { 86 super(initFont(font)); 87 peer = (GdkFontPeer) this.font.getPeer(); 88 89 font_metrics = new int[5]; 90 double [] hires = new double[5]; 91 peer.getFontMetrics (hires); 92 for (int i = 0; i < 5; ++i) 93 font_metrics[i] = (int) hires[i]; 94 } 95 stringWidth(String str)96 public int stringWidth (String str) 97 { 98 double [] hires = new double[6]; 99 peer.getTextMetrics(str, hires); 100 return (int) hires [TEXT_METRICS_WIDTH]; 101 } 102 charWidth(char ch)103 public int charWidth (char ch) 104 { 105 return stringWidth (new String (new char[] { ch })); 106 } 107 charsWidth(char data[], int off, int len)108 public int charsWidth (char data[], int off, int len) 109 { 110 return stringWidth (new String (data, off, len)); 111 } 112 113 /* 114 Sun's Motif implementation always returns 0 or 1 here (???), but 115 going by the X11 man pages, it seems as though we should return 116 font.ascent + font.descent. 117 */ getLeading()118 public int getLeading () 119 { 120 return 1; 121 } 122 getAscent()123 public int getAscent () 124 { 125 return font_metrics[FONT_METRICS_ASCENT]; 126 } 127 getMaxAscent()128 public int getMaxAscent () 129 { 130 return font_metrics[FONT_METRICS_MAX_ASCENT]; 131 } 132 getDescent()133 public int getDescent () 134 { 135 return font_metrics[FONT_METRICS_DESCENT]; 136 } 137 getMaxDescent()138 public int getMaxDescent () 139 { 140 return font_metrics[FONT_METRICS_MAX_DESCENT]; 141 } 142 getMaxAdvance()143 public int getMaxAdvance () 144 { 145 return font_metrics[FONT_METRICS_MAX_ADVANCE]; 146 } 147 } 148