Mercurial > projects > dwt-addons
annotate dwtx/draw2d/TextUtilities.d @ 98:95307ad235d9
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author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 03 Aug 2008 00:52:14 +0200 |
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children | 1082a0fc2bb8 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2007 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 |
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14 module dwtx.draw2d.TextUtilities; |
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15 |
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16 import dwt.dwthelper.utils; |
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17 |
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18 |
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19 import dwt.graphics.Font; |
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20 import dwt.graphics.FontMetrics; |
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21 import dwtx.draw2d.geometry.Dimension; |
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22 import dwtx.draw2d.FigureUtilities; |
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23 |
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24 /** |
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25 * Provides miscellaneous text operations. Clients may subclass this class if |
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26 * necessary. |
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27 * |
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28 * @author crevells |
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29 * @since 3.4 |
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30 */ |
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31 public class TextUtilities { |
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32 |
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33 /** |
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34 * a singleton default instance |
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35 */ |
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36 public static TextUtilities INSTANCE; |
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37 |
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38 static this(){ |
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39 INSTANCE = new TextUtilities(); |
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40 } |
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41 |
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42 /** |
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43 * Returns the Dimensions of <i>s</i> in Font <i>f</i>. |
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44 * |
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45 * @param s |
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46 * the string |
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47 * @param f |
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48 * the font |
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49 * @return the dimensions of the given string |
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50 */ |
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51 public Dimension getStringExtents(String s, Font f) { |
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52 return FigureUtilities.getStringExtents(s, f); |
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53 } |
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54 |
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55 /** |
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56 * Returns the Dimensions of the given text, converting newlines and tabs |
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57 * appropriately. |
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58 * |
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59 * @param s |
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60 * the text |
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61 * @param f |
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62 * the font |
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63 * @return the dimensions of the given text |
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64 */ |
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65 public Dimension getTextExtents(String s, Font f) { |
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66 return FigureUtilities.getTextExtents(s, f); |
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67 } |
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68 |
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69 /** |
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70 * Gets the font's ascent. |
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71 * |
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72 * @param font |
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73 * @return the font's ascent |
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74 */ |
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75 public int getAscent(Font font) { |
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76 FontMetrics fm = FigureUtilities.getFontMetrics(font); |
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77 return fm.getHeight() - fm.getDescent(); |
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78 } |
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79 |
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80 /** |
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81 * Gets the font's descent. |
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82 * |
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83 * @param font |
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84 * @return the font's descent |
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85 */ |
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86 public int getDescent(Font font) { |
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87 return FigureUtilities.getFontMetrics(font).getDescent(); |
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88 } |
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89 |
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90 /** |
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91 * Returns the largest substring of <i>s</i> in Font <i>f</i> that can be |
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92 * confined to the number of pixels in <i>availableWidth<i>. |
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93 * |
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94 * @param s |
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95 * the original string |
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96 * @param f |
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97 * the font |
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98 * @param availableWidth |
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99 * the available width |
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100 * @return the largest substring that fits in the given width |
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101 */ |
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102 public int getLargestSubstringConfinedTo(String s, Font f, |
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103 int availableWidth) { |
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104 FontMetrics metrics = FigureUtilities.getFontMetrics(f); |
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105 int min, max; |
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106 float avg = metrics.getAverageCharWidth(); |
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107 min = 0; |
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108 max = s.length + 1; |
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109 |
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110 // The size of the current guess |
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111 int guess = 0, guessSize = 0; |
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112 while ((max - min) > 1) { |
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113 // Pick a new guess size |
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114 // New guess is the last guess plus the missing width in pixels |
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115 // divided by the average character size in pixels |
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116 guess = guess + cast(int) ((availableWidth - guessSize) / avg); |
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117 |
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118 if (guess >= max) |
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119 guess = max - 1; |
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120 if (guess <= min) |
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121 guess = min + 1; |
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122 |
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123 // Measure the current guess |
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124 guessSize = getTextExtents(s.substring(0, guess), f).width; |
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125 |
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126 if (guessSize < availableWidth) |
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127 // We did not use the available width |
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128 min = guess; |
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129 else |
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130 // We exceeded the available width |
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131 max = guess; |
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132 } |
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133 return min; |
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134 } |
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135 } |