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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 *******************************************************************************/
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11 module dwt.graphics.TextStyle;
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12
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13 import dwt.SWT;
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14 import dwt.graphics.Font;
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15 import dwt.graphics.Color;
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16 import dwt.graphics.GlyphMetrics;
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17
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18 import tango.util.Convert;
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19 /**
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20 * <code>TextStyle</code> defines a set of styles that can be applied
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21 * to a range of text.
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22 * <p>
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23 * The hashCode() method in this class uses the values of the public
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24 * fields to compute the hash value. When storing instances of the
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25 * class in hashed collections, do not modify these fields after the
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26 * object has been inserted.
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27 * </p>
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28 * <p>
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29 * Application code does <em>not</em> need to explicitly release the
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30 * resources managed by each instance when those instances are no longer
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31 * required, and thus no <code>dispose()</code> method is provided.
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32 * </p>
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33 *
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34 * @see TextLayout
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35 * @see Font
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36 * @see Color
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37 *
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38 * @since 3.0
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39 */
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40 public class TextStyle {
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41
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42 /**
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43 * the font of the style
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44 */
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45 public Font font;
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46
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47 /**
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48 * the foreground of the style
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49 */
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50 public Color foreground;
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51
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52 /**
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53 * the background of the style
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54 */
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55 public Color background;
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56
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57 /**
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58 * the underline flag of the style
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59 *
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60 * @since 3.1
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61 */
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62 public bool underline;
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63
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64 /**
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65 * the strikeout flag of the style
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66 *
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67 * @since 3.1
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68 */
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69 public bool strikeout;
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70
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71 /**
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72 * the GlyphMetrics of the style
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73 *
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74 * @since 3.2
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75 */
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76 public GlyphMetrics metrics;
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77
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78 /**
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79 * the baseline rise of the style.
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80 *
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81 * @since 3.2
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82 */
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83 public int rise;
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84
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85 /**
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86 * Create a new text style with the specified font, foreground
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87 * and background.
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88 *
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89 * @param font the font of the style, <code>null</code> if none
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90 * @param foreground the foreground color of the style, <code>null</code> if none
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91 * @param background the background color of the style, <code>null</code> if none
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92 */
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93 public this (Font font, Color foreground, Color background) {
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94 if (font !is null && font.isDisposed()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
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95 if (foreground !is null && foreground.isDisposed()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
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96 if (background !is null && background.isDisposed()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
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97 this.font = font;
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98 this.foreground = foreground;
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99 this.background = background;
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100 }
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101
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102 /**
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103 * Compares the argument to the receiver, and returns true
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104 * if they represent the <em>same</em> object using a class
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105 * specific comparison.
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106 *
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107 * @param object the object to compare with this object
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108 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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109 *
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110 * @see #hashCode()
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111 */
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112 public override int opEquals(Object object) {
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113 if (object is this) return true;
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114 if (object is null) return false;
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115 if (!(cast(TextStyle)object)) return false;
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116 TextStyle style = cast(TextStyle)object;
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117 if (foreground !is null) {
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118 if ( foreground != style.foreground ) return false;
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119 } else if (style.foreground !is null) return false;
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120 if (background !is null) {
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121 if ( background != style.background ) return false;
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122 } else if (style.background !is null) return false;
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123 if (font !is null) {
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124 if (font != style.font) return false;
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125 } else if (style.font != null) return false;
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126 if (metrics != null || style.metrics !is null) return false;
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127 if (underline !is style.underline) return false;
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128 if (strikeout !is style.strikeout) return false;
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129 if (rise !is style.rise) return false;
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130 return true;
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131 }
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132
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133 /**
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134 * Returns an integer hash code for the receiver. Any two
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135 * objects that return <code>true</code> when passed to
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136 * <code>equals</code> must return the same value for this
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137 * method.
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138 *
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139 * @return the receiver's hash
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140 *
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141 * @see #equals(Object)
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142 */
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143 public override hash_t toHash() {
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144 int hash = 0;
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145 if (foreground !is null) hash ^= foreground.toHash();
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146 if (background !is null) hash ^= background.toHash();
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147 if (font !is null) hash ^= font.toHash();
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148 if (metrics !is null) hash ^= metrics.toHash();
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149 if (underline) hash ^= hash;
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150 if (strikeout) hash ^= hash;
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151 hash ^= rise;
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152 return hash;
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153 }
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154
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155 /**
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156 * Returns a string containing a concise, human-readable
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157 * description of the receiver.
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158 *
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159 * @return a string representation of the <code>TextStyle</code>
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160 */
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161 public char[] toString () {
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162 char[] buffer = "TextStyle {";
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163 int startLength = buffer.length;
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164 if (font != null) {
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165 if (buffer.length > startLength) buffer ~= ", ";
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166 buffer ~= "font=";
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167 buffer ~= font.toString;
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168 }
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169 if (foreground != null) {
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170 if (buffer.length > startLength) buffer ~= ", ";
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171 buffer ~= "foreground=";
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172 buffer ~= foreground.toString;
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173 }
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174 if (background != null) {
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175 if (buffer.length > startLength) buffer ~= ", ";
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176 buffer ~= "background=";
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177 buffer ~= background.toString;
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178 }
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179 if (underline) {
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180 if (buffer.length > startLength) buffer ~= ", ";
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181 buffer ~= "underlined";
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182 }
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183 if (strikeout) {
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184 if (buffer.length > startLength) buffer ~= ", ";
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185 buffer ~= "striked out";
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186 }
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187 if (rise != 0) {
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188 if (buffer.length > startLength) buffer ~= ", ";
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189 buffer ~= "rise=";
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190 buffer ~= to!(char[])(rise);
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191 }
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192 if (metrics != null) {
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193 if (buffer.length > startLength) buffer ~= ", ";
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194 buffer ~= "metrics=";
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195 buffer ~= metrics.toString;
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196 }
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197 buffer ~= "}";
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198 return buffer;
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199 }
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200
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201 }
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