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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 module org.eclipse.swt.custom.StyleRange;
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14
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15 import java.lang.all;
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16
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17
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18 import org.eclipse.swt.SWT;
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19 import org.eclipse.swt.graphics.Color;
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20 import org.eclipse.swt.graphics.TextStyle;
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21 import org.eclipse.swt.internal.CloneableCompatibility;
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22 import org.eclipse.swt.custom.StyleRange;
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23 import org.eclipse.swt.custom.TextChangedEvent;
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24 import org.eclipse.swt.custom.TextChangingEvent;
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25
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26
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27 /**
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28 * <code>StyleRange</code> defines a set of styles for a specified
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29 * range of text.
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30 * <p>
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31 * The hashCode() method in this class uses the values of the public
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32 * fields to compute the hash value. When storing instances of the
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33 * class in hashed collections, do not modify these fields after the
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34 * object has been inserted.
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35 * </p>
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36 *
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37 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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38 */
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39 public class StyleRange : TextStyle, CloneableCompatibility {
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40
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41 /**
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42 * the start offset of the range, zero-based from the document start
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43 */
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44 public int start;
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45
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46 /**
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47 * the length of the range
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48 */
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49 public int length;
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50
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51 /**
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52 * the font style of the range. It may be a combination of
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53 * SWT.NORMAL, SWT.ITALIC or SWT.BOLD
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54 *
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55 * Note: the font style is not used if the <code>font</code> attribute
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56 * is set
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57 */
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58 public int fontStyle = SWT.NORMAL;
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59
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60 /**
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61 * Create a new style range with no styles
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62 *
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63 * @since 3.2
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64 */
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65 public this() {
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66 }
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67 /++
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68 + SWT extension for clone implementation
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69 +/
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70 protected this( StyleRange other ){
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71 super( other );
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72 start = other.start;
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73 length = other.length;
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74 fontStyle = other.fontStyle;
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75 }
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76
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77 /**
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78 * Create a new style range from an existing text style.
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79 *
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80 * @param style the text style to copy
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81 *
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82 * @since 3.4
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83 */
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84 public this(TextStyle style) {
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85 super(style);
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86 }
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87
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88 /**
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89 * Create a new style range.
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90 *
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91 * @param start start offset of the style
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92 * @param length length of the style
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93 * @param foreground foreground color of the style, null if none
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94 * @param background background color of the style, null if none
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95 */
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96 public this(int start, int length, Color foreground, Color background) {
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97 super(null, foreground, background);
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98 this.start = start;
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99 this.length = length;
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100 }
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101
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102 /**
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103 * Create a new style range.
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104 *
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105 * @param start start offset of the style
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106 * @param length length of the style
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107 * @param foreground foreground color of the style, null if none
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108 * @param background background color of the style, null if none
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109 * @param fontStyle font style of the style, may be SWT.NORMAL, SWT.ITALIC or SWT.BOLD
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110 */
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111 public this(int start, int length, Color foreground, Color background, int fontStyle) {
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112 this(start, length, foreground, background);
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113 this.fontStyle = fontStyle;
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114 }
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115
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116 /**
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117 * Compares the argument to the receiver, and returns true
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118 * if they represent the <em>same</em> object using a class
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119 * specific comparison.
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120 *
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121 * @param object the object to compare with this object
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122 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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123 *
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124 * @see #hashCode()
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125 */
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26
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126 public override equals_t opEquals(Object object) {
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25
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127 if (object is this) return true;
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128 if (auto style = cast(StyleRange) object ) {
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129 if (start !is style.start) return false;
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130 if (length !is style.length) return false;
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131 return similarTo(style);
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132 }
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133 return false;
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134 }
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135
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136 /**
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137 * Returns an integer hash code for the receiver. Any two
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138 * objects that return <code>true</code> when passed to
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139 * <code>equals</code> must return the same value for this
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140 * method.
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141 *
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142 * @return the receiver's hash
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143 *
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144 * @see #equals(Object)
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145 */
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146 public override hash_t toHash() {
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147 return super.toHash() ^ fontStyle;
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148 }
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149 bool isVariableHeight() {
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150 return font !is null || metrics !is null || rise !is 0;
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151 }
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152 /**
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153 * Returns whether or not the receiver is unstyled (i.e., does not have any
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154 * style attributes specified).
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155 *
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156 * @return true if the receiver is unstyled, false otherwise.
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157 */
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158 public bool isUnstyled() {
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159 if (font !is null) return false;
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160 if (rise !is 0) return false;
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161 if (metrics !is null) return false;
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162 if (foreground !is null) return false;
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163 if (background !is null) return false;
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164 if (fontStyle !is SWT.NORMAL) return false;
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165 if (underline) return false;
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166 if (strikeout) return false;
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167 if (borderStyle !is SWT.NONE) return false;
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168 return true;
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169 }
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170
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171 /**
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172 * Compares the specified object to this StyleRange and answer if the two
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173 * are similar. The object must be an instance of StyleRange and have the
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174 * same field values for except for start and length.
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175 *
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176 * @param style the object to compare with this object
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177 * @return true if the objects are similar, false otherwise
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178 */
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179 public bool similarTo(StyleRange style) {
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180 if (!super.opEquals(style)) return false;
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181 if (fontStyle !is style.fontStyle) return false;
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182 return true;
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183 }
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184
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185 /**
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186 * Returns a new StyleRange with the same values as this StyleRange.
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187 *
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188 * @return a shallow copy of this StyleRange
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189 */
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190 public /+override+/ Object clone() {
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191 return new StyleRange( this );
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192 }
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193
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194 /**
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195 * Returns a string containing a concise, human-readable
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196 * description of the receiver.
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197 *
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198 * @return a string representation of the StyleRange
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199 */
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200 public override String toString() {
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201 StringBuffer buffer = new StringBuffer();
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202 buffer.append("StyleRange {");
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203 buffer.append(start);
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204 buffer.append(", ");
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205 buffer.append(length);
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206 buffer.append(", fontStyle=");
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207 switch (fontStyle) {
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208 case SWT.BOLD:
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209 buffer.append("bold");
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210 break;
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211 case SWT.ITALIC:
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212 buffer.append("italic");
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213 break;
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214 case SWT.BOLD | SWT.ITALIC:
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215 buffer.append("bold-italic");
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216 break;
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217 default:
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218 buffer.append("normal");
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219 }
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220 String str = super.toString();
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221 int index = str.indexOf( '{');
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222 str = str[ index + 1 .. $ ];
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223 if (str.length > 1) buffer.append(", ");
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224 buffer.append(str);
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225 return buffer.toString();
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226 }
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227 }
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