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annotate dwtx/jface/viewers/StyledString.d @ 104:04b47443bb01

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Reworked the collection uses to make use of a wrapper collection that is compatible to the Java Collections. These new wrappers now use the tango.util.containers instead of the tango.util.collections.
author Frank Benoit <benoit@tionex.de>
date Thu, 07 Aug 2008 15:01:33 +0200
parents 5df4896124c7
children
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1 /*******************************************************************************
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2 * Copyright (c) 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 dwtx.jface.viewers.StyledString;
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14
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15 import dwt.custom.StyleRange;
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16 import dwt.graphics.TextStyle;
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17 import dwtx.jface.preference.JFacePreferences;
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18 import dwtx.jface.resource.ColorRegistry;
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19 import dwtx.jface.resource.JFaceResources;
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20
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21 import dwt.dwthelper.utils;
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22 import dwtx.dwtxhelper.Collection;
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23 import tango.text.convert.Format;
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24 import tango.core.Exception;
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25
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27 /**
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28 * A mutable string with styled ranges. All ranges mark substrings of the string
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29 * and do not overlap. Styles are applied using instances of {@link Styler} to
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30 * compute the result of {@link #getStyleRanges()}.
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31 *
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32 * The styled string can be built in the following two ways:
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33 * <ul>
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34 * <li>new strings with stylers can be appended</li>
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35 * <li>stylers can by applied to ranges of the existing string</li>
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36 * </ul>
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37 *
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38 * <p>
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39 * This class may be instantiated; it is not intended to be subclassed.
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40 * </p>
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41 *
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42 * @since 3.4
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43 */
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44 public class StyledString {
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45
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46 /**
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47 * A styler will be asked to apply its styles to one ore more ranges in the
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48 * {@link StyledString}.
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49 *
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50 */
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51 public static abstract class Styler {
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52
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53 /**
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54 * Applies the styles represented by this object to the given textStyle.
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55 *
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56 * @param textStyle
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57 * the {@link TextStyle} to modify
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58 */
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59 public abstract void applyStyles(TextStyle textStyle);
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60 }
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61
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62 /**
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63 * A built-in styler using the {@link JFacePreferences#QUALIFIER_COLOR}
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64 * managed in the JFace color registry (See
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65 * {@link JFaceResources#getColorRegistry()}).
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66 */
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67 public static const Styler QUALIFIER_STYLER;
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68
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69 /**
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70 * A built-in styler using the {@link JFacePreferences#COUNTER_COLOR}
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71 * managed in the JFace color registry (See
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72 * {@link JFaceResources#getColorRegistry()}).
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73 */
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74 public static const Styler COUNTER_STYLER;
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75
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76 /**
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77 * A built-in styler using the {@link JFacePreferences#DECORATIONS_COLOR}
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78 * managed in the JFace color registry (See
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79 * {@link JFaceResources#getColorRegistry()}).
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80 */
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81 public static const Styler DECORATIONS_STYLER;
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82
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83 /**
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84 * Creates a styler that takes the given foreground and background colors
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85 * from the JFace color registry.
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86 *
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87 * @param foregroundColorName
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88 * the color name for the foreground color
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89 * @param backgroundColorName
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90 * the color name for the background color
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91 *
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92 * @return the created style
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93 */
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94 public static Styler createColorRegistryStyler(String foregroundColorName,
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95 String backgroundColorName) {
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96 return new DefaultStyler(foregroundColorName, backgroundColorName);
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97 }
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98
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99 private static const StyleRange[] EMPTY;
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100 private StringBuffer fBuffer;
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101 private StyleRunList fStyleRuns;
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102
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103 static this(){
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104 QUALIFIER_STYLER = createColorRegistryStyler(
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105 JFacePreferences.QUALIFIER_COLOR, null);
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106 COUNTER_STYLER = createColorRegistryStyler(
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107 JFacePreferences.COUNTER_COLOR, null);
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108 DECORATIONS_STYLER = createColorRegistryStyler(
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109 JFacePreferences.DECORATIONS_COLOR, null);
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110 EMPTY = new StyleRange[0];
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111 }
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112
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113 /**
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114 * Creates an empty {@link StyledString}.
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115 */
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116 public this() {
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117 fBuffer = new StringBuffer();
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118 fStyleRuns = null;
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119 }
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120
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121 /**
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122 * Creates an {@link StyledString} initialized with a string without
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123 * a style associated.
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124 *
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125 * @param string
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126 * the string
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127 */
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128 public this(String string) {
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129 this(string, null);
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130 }
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131
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132 /**
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133 * Creates an {@link StyledString} initialized with a string and a
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134 * style.
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135 *
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136 * @param string
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137 * the string
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138 * @param styler
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139 * the styler for the string or <code>null</code> to not
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140 * associated a styler.
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141 */
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142 public this(String string, Styler styler) {
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143 this();
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144 append(string, styler);
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145 }
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146
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147 /**
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148 * Returns the string of this {@link StyledString}.
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149 *
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150 * @return the current string of this {@link StyledString}.
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151 */
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152 public String getString() {
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153 return fBuffer.toString();
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154 }
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155
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156 /**
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157 * Returns the string of this {@link StyledString}.
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158 *
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159 * @return the current string of this {@link StyledString}.
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160 */
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161 public override String toString() {
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162 return getString();
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163 }
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164
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165 /**
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166 * Returns the length of the string of this {@link StyledString}.
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167 *
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168 * @return the length of the current string
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169 */
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170 public int length() {
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171 return fBuffer.length();
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172 }
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173
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174 /**
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175 * Appends a string to the {@link StyledString}. The appended string
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176 * will have no associated styler.
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177 *
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178 * @param string
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179 * the string to append
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180 * @return returns a reference to this object
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181 */
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182 public StyledString append(String string) {
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183 return append(string, null);
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184 }
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185
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186 // /**
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187 // * Appends the string representation of the given character array
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188 // * to the {@link StyledString}. The appended
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189 // * character array will have no associated styler.
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190 // *
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191 // * @param chars
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192 // * the character array to append
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193 // * @return returns a reference to this object
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194 // */
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195 // public StyledString append(char[] chars) {
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196 // return append(chars, null);
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197 // }
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198
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199 /**
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200 * Appends the string representation of the given character
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201 * to the {@link StyledString}. The appended
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202 * character will have no associated styler.
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203 *
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204 * @param ch
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205 * the character to append
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206 * @return returns a reference to this object
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207 */
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208 public StyledString append(dchar ch) {
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209 return append(dcharToString(ch), null);
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210 }
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211
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212 /**
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213 * Appends a string with styles to the {@link StyledString}.
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214 *
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215 * @param string
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216 * the string to append
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217 * @return returns a reference to this object
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218 */
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219 public StyledString append(StyledString string) {
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220 if (string.length() is 0) {
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221 return this;
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222 }
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223
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224 int offset = fBuffer.length();
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225 fBuffer.append(string.toString());
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226
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227 List otherRuns = string.fStyleRuns;
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228 if (otherRuns !is null && !otherRuns.isEmpty()) {
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229 for (int i = 0; i < otherRuns.size(); i++) {
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230 StyleRun curr = cast(StyleRun) otherRuns.get(i);
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231 if (i is 0 && curr.offset !is 0) {
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232 appendStyleRun(null, offset); // appended string will
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233 // start with the default
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234 // color
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235 }
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236 appendStyleRun(curr.style, offset + curr.offset);
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237 }
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238 } else {
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239 appendStyleRun(null, offset); // appended string will start with
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240 // the default color
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241 }
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242 return this;
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243 }
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244
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245 /**
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246 * Appends the string representation of the given character
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247 * with a style to the {@link StyledString}. The
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248 * appended character will have the given style associated.
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249 *
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250 * @param ch
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251 * the character to append
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252 * @param styler
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253 * the styler to use for styling the character to append or
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254 * <code>null</code> if no styler should be associated with the
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255 * appended character
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256 * @return returns a reference to this object
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257 */
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258 public StyledString append(dchar ch, Styler styler) {
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259 return append(dcharToString(ch), styler);
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260 }
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261
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262 /**
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263 * Appends a string with a style to the {@link StyledString}. The
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264 * appended string will be styled using the given styler.
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265 *
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266 * @param string
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267 * the string to append
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268 * @param styler
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269 * the styler to use for styling the string to append or
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270 * <code>null</code> if no styler should be associated with the
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271 * appended string.
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272 * @return returns a reference to this object
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273 */
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274 public StyledString append(String string, Styler styler) {
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275 if (string.length is 0)
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276 return this;
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277
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278 int offset = fBuffer.length; // the length before appending
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279 fBuffer.append(string);
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280 appendStyleRun(styler, offset);
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281 return this;
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282 }
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283
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284 // /**
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285 // * Appends the string representation of the given character array
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286 // * with a style to the {@link StyledString}. The
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287 // * appended character array will be styled using the given styler.
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288 // *
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289 // * @param chars
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290 // * the character array to append
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291 // * @param styler
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292 // * the styler to use for styling the character array to append or
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293 // * <code>null</code> if no styler should be associated with the
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294 // * appended character array
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295 // * @return returns a reference to this object
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296 // */
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297 // public StyledString append(char[] chars, Styler styler) {
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298 // if (chars.length is 0)
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299 // return this;
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300 //
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301 // int offset = fBuffer.length(); // the length before appending
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302 // fBuffer.append(chars);
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303 // appendStyleRun(styler, offset);
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304 // return this;
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305 // }
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306
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307 /**
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308 * Sets a styler to use for the given source range. The range must be
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309 * subrange of actual string of this {@link StyledString}. Stylers
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310 * previously set for that range will be overwritten.
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311 *
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312 * @param offset
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313 * the start offset of the range
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314 * @param length
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315 * the length of the range
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316 * @param styler
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317 * the styler to set
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318 *
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319 * @throws StringIndexOutOfBoundsException
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320 * if <code>start</code> is less than zero, or if offset plus
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321 * length is greater than the length of this object.
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322 */
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323 public void setStyle(int offset, int length, Styler styler) {
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324 if (offset < 0 || offset + length > fBuffer.length) {
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325 throw new IllegalArgumentException (
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326 Format( "Invalid offset ({}) or length ({})", offset, length )); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$
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327 }
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328 if (length is 0) {
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329 return;
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330 }
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331 if (!hasRuns() || getLastRun().offset <= offset) {
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332 appendStyleRun(styler, offset);
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333 if (offset + length !is fBuffer.length()) {
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334 appendStyleRun(null, offset + length);
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335 }
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336 return;
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337 }
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338
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339 int endRun = findRun(offset + length);
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340 if (endRun >= 0) {
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341 // run with the same end index, nothing to change
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342 } else {
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343 endRun = -(endRun + 1);
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344 if (offset + length < fBuffer.length()) {
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345 Styler prevStyle = endRun > 0 ? fStyleRuns.getRun(endRun - 1).style
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346 : null;
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347 fStyleRuns
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348 .add(endRun, new StyleRun(offset + length, prevStyle));
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349 }
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350 }
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351
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352 int startRun = findRun(offset);
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353 if (startRun >= 0) {
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354 // run with the same start index
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355 StyleRun styleRun = fStyleRuns.getRun(startRun);
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356 styleRun.style = styler;
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357 } else {
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358 startRun = -(startRun + 1);
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359
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360 Styler prevStyle = startRun > 0 ? fStyleRuns.getRun(startRun - 1).style
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361 : null;
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362 if (isDifferentStyle(prevStyle, styler)
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363 || (startRun is 0 && styler !is null)) {
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364 fStyleRuns.add(startRun, new StyleRun(offset, styler));
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365 endRun++; // endrun is moved one back
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366 } else {
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367 startRun--; // we use the previous
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368 }
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369 }
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370 if (startRun + 1 < endRun) {
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371 fStyleRuns.removeRange(startRun + 1, endRun);
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372 }
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373 }
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374
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375 /**
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376 * Returns an array of {@link StyleRange} resulting from applying all
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377 * associated stylers for this string builder.
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378 *
70
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379 * @return an array of all {@link StyleRange} resulting from applying the
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380 * stored stylers to this string.
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381 */
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382 public StyleRange[] getStyleRanges() {
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383 if (hasRuns()) {
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384 ArrayList res = new ArrayList();
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385
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386 List styleRuns = getStyleRuns();
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387 int offset = 0;
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388 Styler style = null;
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389 for (int i = 0; i < styleRuns.size(); i++) {
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390 StyleRun curr = cast(StyleRun) styleRuns.get(i);
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391 if (isDifferentStyle(curr.style, style)) {
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392 if (curr.offset > offset && style !is null) {
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393 res.add(createStyleRange(offset, curr.offset, style));
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394 }
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395 offset = curr.offset;
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396 style = curr.style;
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397 }
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398 }
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399 if (fBuffer.length() > offset && style !is null) {
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400 res.add(createStyleRange(offset, fBuffer.length(), style));
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401 }
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402 return arraycast!(StyleRange)(res.toArray());
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403 }
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404 return EMPTY;
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405 }
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406
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407 private int findRun(int offset) {
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408 // method assumes that fStyleRuns is not null
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409 int low = 0;
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410 int high = fStyleRuns.size() - 1;
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411 while (low <= high) {
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412 int mid = (low + high) / 2;
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413 StyleRun styleRun = fStyleRuns.getRun(mid);
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414 if (styleRun.offset < offset) {
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415 low = mid + 1;
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416 } else if (styleRun.offset > offset) {
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417 high = mid - 1;
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418 } else {
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419 return mid; // key found
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420 }
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421 }
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422 return -(low + 1); // key not found.
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423 }
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424
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425 private StyleRange createStyleRange(int start, int end, Styler style) {
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426 StyleRange styleRange = new StyleRange();
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427 styleRange.start = start;
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428 styleRange.length = end - start;
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429 style.applyStyles(styleRange);
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430 return styleRange;
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431 }
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432
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433 private bool hasRuns() {
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434 return fStyleRuns !is null && !fStyleRuns.isEmpty();
70
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435 }
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436
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437 private void appendStyleRun(Styler style, int offset) {
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438 StyleRun lastRun = getLastRun();
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439 if (lastRun !is null && lastRun.offset is offset) {
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440 lastRun.style = style;
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441 return;
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442 }
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443
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444 if (lastRun is null && style !is null || lastRun !is null
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445 && isDifferentStyle(style, lastRun.style)) {
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446 getStyleRuns().add(new StyleRun(offset, style));
70
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447 }
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448 }
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449
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450 private bool isDifferentStyle(Styler style1, Styler style2) {
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451 if (style1 is null) {
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452 return style2 !is null;
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453 }
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454 return !style1.opEquals(style2);
70
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455 }
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456
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457 private StyleRun getLastRun() {
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458 if (fStyleRuns is null || fStyleRuns.isEmpty()) {
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459 return null;
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460 }
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461 return fStyleRuns.getRun(fStyleRuns.size() - 1);
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462 }
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463
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464 private List getStyleRuns() {
70
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465 if (fStyleRuns is null)
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466 fStyleRuns = new StyleRunList();
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467 return fStyleRuns;
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468 }
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469
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470 private static class StyleRun {
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471 public int offset;
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472 public Styler style;
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473
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474 public this(int offset, Styler style) {
70
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475 this.offset = offset;
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476 this.style = style;
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477 }
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478
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479 public override String toString() {
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480 return Format("Offset {}, style: {}", offset, style ); //$NON-NLS-1$//$NON-NLS-2$
70
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481 }
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482 }
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483
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484 private static class StyleRunList : ArrayList {
70
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485 private static final long serialVersionUID = 123L;
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486
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487 public this() {
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488 super(3);
70
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489 }
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490
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491 public StyleRun getRun(int index) {
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492 return cast(StyleRun) get(index);
70
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493 }
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494
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diff changeset
495 public void removeRange(int fromIndex, int toIndex) {
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diff changeset
496 super.removeRange(fromIndex, toIndex);
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497 }
70
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498 }
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499
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diff changeset
500 private static class DefaultStyler : Styler {
70
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501 private final String fForegroundColorName;
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502 private final String fBackgroundColorName;
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503
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504 public this(String foregroundColorName,
70
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505 String backgroundColorName) {
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506 fForegroundColorName = foregroundColorName;
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507 fBackgroundColorName = backgroundColorName;
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508 }
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diff changeset
509
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diff changeset
510 public void applyStyles(TextStyle textStyle) {
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diff changeset
511 ColorRegistry colorRegistry = JFaceResources.getColorRegistry();
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diff changeset
512 if (fForegroundColorName !is null) {
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diff changeset
513 textStyle.foreground = colorRegistry.get(fForegroundColorName);
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diff changeset
514 }
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diff changeset
515 if (fBackgroundColorName !is null) {
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diff changeset
516 textStyle.background = colorRegistry.get(fBackgroundColorName);
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parents:
diff changeset
517 }
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parents:
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518 }
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parents:
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519 }
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parents:
diff changeset
520
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521 }