Mercurial > projects > dwt-mac
annotate dwt/custom/DefaultContent.d @ 7:e831403a80a9
Add 'cast' to casts
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 27 Aug 2008 14:30:35 +0200 |
parents | 1a8b3cb347e0 |
children | 6337764516f1 |
rev | line source |
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0
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 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 *******************************************************************************/ |
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11 module dwt.custom; |
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12 |
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13 import dwt.*; |
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14 import dwt.internal.Compatibility; |
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15 import dwt.widgets.*; |
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16 import java.util.Vector; |
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17 |
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18 class DefaultContent : StyledTextContent { |
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19 private final static String LineDelimiter = System.getProperty("line.separator"); |
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20 |
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21 Vector textListeners = new Vector(); // stores text listeners for event sending |
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22 char[] textStore = new char[0]; // stores the actual text |
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23 int gapStart = -1; // the character position start of the gap |
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24 int gapEnd = -1; // the character position after the end of the gap |
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25 int gapLine = -1; // the line on which the gap exists, the gap will always be associated with one line |
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26 int highWatermark = 300; |
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27 int lowWatermark = 50; |
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28 |
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29 int[][] lines = new int[50][2]; // array of character positions and lengths representing the lines of text |
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30 int lineCount = 0; // the number of lines of text |
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31 int expandExp = 1; // the expansion exponent, used to increase the lines array exponentially |
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32 int replaceExpandExp = 1; // the expansion exponent, used to increase the lines array exponentially |
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33 |
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34 /** |
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35 * Creates a new DefaultContent and initializes it. A <code>StyledTextContent</> will always have |
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36 * at least one empty line. |
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37 */ |
5 | 38 this() { |
0
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39 super(); |
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40 setText(""); |
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41 } |
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42 /** |
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43 * Adds a line to the end of the line indexes array. Increases the size of the array if necessary. |
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44 * <code>lineCount</code> is updated to reflect the new entry. |
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45 * <p> |
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46 * |
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47 * @param start the start of the line |
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48 * @param length the length of the line |
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49 */ |
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50 void addLineIndex(int start, int length) { |
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51 int size = lines.length; |
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52 if (lineCount is size) { |
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53 // expand the lines by powers of 2 |
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54 int[][] newLines = new int[size+Compatibility.pow2(expandExp)][2]; |
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55 System.arraycopy(lines, 0, newLines, 0, size); |
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56 lines = newLines; |
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57 expandExp++; |
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58 } |
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59 int[] range = new int[] {start, length}; |
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60 lines[lineCount] = range; |
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61 lineCount++; |
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62 } |
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63 /** |
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64 * Adds a line index to the end of <code>linesArray</code>. Increases the |
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65 * size of the array if necessary and returns a new array. |
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66 * <p> |
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67 * |
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68 * @param start the start of the line |
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69 * @param length the length of the line |
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70 * @param linesArray the array to which to add the line index |
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71 * @param count the position at which to add the line |
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72 * @return a new array of line indexes |
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73 */ |
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74 int[][] addLineIndex(int start, int length, int[][] linesArray, int count) { |
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75 int size = linesArray.length; |
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76 int[][] newLines = linesArray; |
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77 if (count is size) { |
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78 newLines = new int[size+Compatibility.pow2(replaceExpandExp)][2]; |
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79 replaceExpandExp++; |
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80 System.arraycopy(linesArray, 0, newLines, 0, size); |
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81 } |
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82 int[] range = new int[] {start, length}; |
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83 newLines[count] = range; |
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84 return newLines; |
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85 } |
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86 /** |
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87 * Adds a <code>TextChangeListener</code> listening for |
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88 * <code>TextChangingEvent</code> and <code>TextChangedEvent</code>. A |
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89 * <code>TextChangingEvent</code> is sent before changes to the text occur. |
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90 * A <code>TextChangedEvent</code> is sent after changes to the text |
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91 * occurred. |
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92 * <p> |
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93 * |
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94 * @param listener the listener |
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95 * @exception IllegalArgumentException <ul> |
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96 * <li>ERROR_NULL_ARGUMENT when listener is null</li> |
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97 * </ul> |
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98 */ |
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99 public void addTextChangeListener(TextChangeListener listener) { |
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100 if (listener is null) error(DWT.ERROR_NULL_ARGUMENT); |
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101 StyledTextListener typedListener = new StyledTextListener(listener); |
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102 textListeners.addElement(typedListener); |
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103 } |
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104 /** |
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105 * Adjusts the gap to accommodate a text change that is occurring. |
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106 * <p> |
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107 * |
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108 * @param position the position at which a change is occurring |
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109 * @param sizeHint the size of the change |
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110 * @param line the line where the gap will go |
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111 */ |
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112 void adjustGap(int position, int sizeHint, int line) { |
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113 if (position is gapStart) { |
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114 // text is being inserted at the gap position |
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115 int size = (gapEnd - gapStart) - sizeHint; |
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116 if (lowWatermark <= size && size <= highWatermark) |
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117 return; |
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118 } else if ((position + sizeHint is gapStart) && (sizeHint < 0)) { |
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119 // text is being deleted at the gap position |
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120 int size = (gapEnd - gapStart) - sizeHint; |
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121 if (lowWatermark <= size && size <= highWatermark) |
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122 return; |
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123 } |
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124 moveAndResizeGap(position, sizeHint, line); |
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125 } |
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126 /** |
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127 * Calculates the indexes of each line in the text store. Assumes no gap exists. |
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128 * Optimized to do less checking. |
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129 */ |
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130 void indexLines(){ |
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131 int start = 0; |
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132 lineCount = 0; |
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133 int textLength = textStore.length; |
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134 int i; |
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135 for (i = start; i < textLength; i++) { |
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136 char ch = textStore[i]; |
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137 if (ch is DWT.CR) { |
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138 // see if the next character is a LF |
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139 if (i + 1 < textLength) { |
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140 ch = textStore[i+1]; |
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141 if (ch is DWT.LF) { |
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142 i++; |
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143 } |
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144 } |
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145 addLineIndex(start, i - start + 1); |
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146 start = i + 1; |
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147 } else if (ch is DWT.LF) { |
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148 addLineIndex(start, i - start + 1); |
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149 start = i + 1; |
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150 } |
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151 } |
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152 addLineIndex(start, i - start); |
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153 } |
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154 /** |
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155 * Returns whether or not the given character is a line delimiter. Both CR and LF |
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156 * are valid line delimiters. |
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157 * <p> |
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158 * |
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159 * @param ch the character to test |
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160 * @return true if ch is a delimiter, false otherwise |
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161 */ |
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162 bool isDelimiter(char ch) { |
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163 if (ch is DWT.CR) return true; |
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164 if (ch is DWT.LF) return true; |
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165 return false; |
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166 } |
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167 /** |
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168 * Determine whether or not the replace operation is valid. DefaultContent will not allow |
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169 * the /r/n line delimiter to be split or partially deleted. |
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170 * <p> |
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171 * |
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172 * @param start start offset of text to replace |
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173 * @param replaceLength start offset of text to replace |
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174 * @param newText start offset of text to replace |
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175 * @return a bool specifying whether or not the replace operation is valid |
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176 */ |
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177 protected bool isValidReplace(int start, int replaceLength, String newText){ |
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178 if (replaceLength is 0) { |
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179 // inserting text, see if the \r\n line delimiter is being split |
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180 if (start is 0) return true; |
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181 if (start is getCharCount()) return true; |
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182 char before = getTextRange(start - 1, 1).charAt(0); |
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183 if (before is '\r') { |
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184 char after = getTextRange(start, 1).charAt(0); |
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185 if (after is '\n') return false; |
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186 } |
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187 } else { |
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188 // deleting text, see if part of a \r\n line delimiter is being deleted |
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189 char startChar = getTextRange(start, 1).charAt(0); |
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190 if (startChar is '\n') { |
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191 // see if char before delete position is \r |
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192 if (start !is 0) { |
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193 char before = getTextRange(start - 1, 1).charAt(0); |
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194 if (before is '\r') return false; |
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195 } |
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196 } |
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197 char endChar = getTextRange(start + replaceLength - 1, 1).charAt(0); |
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198 if (endChar is '\r') { |
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199 // see if char after delete position is \n |
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200 if (start + replaceLength !is getCharCount()) { |
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201 char after = getTextRange(start + replaceLength, 1).charAt(0); |
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202 if (after is '\n') return false; |
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203 } |
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204 } |
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205 } |
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206 return true; |
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207 } |
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208 /** |
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209 * Calculates the indexes of each line of text in the given range. |
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210 * <p> |
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211 * |
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212 * @param offset the logical start offset of the text lineate |
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213 * @param length the length of the text to lineate, includes gap |
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214 * @param numLines the number of lines to initially allocate for the line index array, |
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215 * passed in for efficiency (the exact number of lines may be known) |
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216 * @return a line indexes array where each line is identified by a start offset and |
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217 * a length |
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218 */ |
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219 int[][] indexLines(int offset, int length, int numLines){ |
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220 int[][] indexedLines = new int[numLines][2]; |
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221 int start = 0; |
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222 int lineCount = 0; |
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223 int i; |
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224 replaceExpandExp = 1; |
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225 for (i = start; i < length; i++) { |
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226 int location = i + offset; |
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227 if ((location >= gapStart) && (location < gapEnd)) { |
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228 // ignore the gap |
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229 } else { |
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230 char ch = textStore[location]; |
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231 if (ch is DWT.CR) { |
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232 // see if the next character is a LF |
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233 if (location+1 < textStore.length) { |
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234 ch = textStore[location+1]; |
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235 if (ch is DWT.LF) { |
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236 i++; |
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237 } |
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238 } |
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239 indexedLines = addLineIndex(start, i - start + 1, indexedLines, lineCount); |
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240 lineCount++; |
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241 start = i + 1; |
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242 } else if (ch is DWT.LF) { |
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243 indexedLines = addLineIndex(start, i - start + 1, indexedLines, lineCount); |
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244 lineCount++; |
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245 start = i + 1; |
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246 } |
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247 } |
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248 } |
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249 int[][] newLines = new int[lineCount+1][2]; |
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250 System.arraycopy(indexedLines, 0, newLines, 0, lineCount); |
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251 int[] range = new int[] {start, i - start}; |
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252 newLines[lineCount] = range; |
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253 return newLines; |
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254 } |
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255 /** |
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256 * Inserts text. |
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257 * <p> |
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258 * |
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259 * @param position the position at which to insert the text |
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260 * @param text the text to insert |
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261 */ |
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262 void insert(int position, String text) { |
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263 if (text.length() is 0) return; |
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264 |
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265 int startLine = getLineAtOffset(position); |
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266 int change = text.length(); |
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267 bool endInsert = position is getCharCount(); |
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268 adjustGap(position, change, startLine); |
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269 |
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270 // during an insert the gap will be adjusted to start at |
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271 // position and it will be associated with startline, the |
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272 // inserted text will be placed in the gap |
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273 int startLineOffset = getOffsetAtLine(startLine); |
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274 // at this point, startLineLength will include the start line |
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275 // and all of the newly inserted text |
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276 int startLineLength = getPhysicalLine(startLine).length(); |
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277 |
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278 if (change > 0) { |
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279 // shrink gap |
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280 gapStart += (change); |
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281 for (int i = 0; i < text.length(); i++) { |
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282 textStore[position + i]= text.charAt(i); |
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283 } |
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284 } |
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285 |
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286 // figure out the number of new lines that have been inserted |
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287 int [][] newLines = indexLines(startLineOffset, startLineLength, 10); |
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288 // only insert an empty line if it is the last line in the text |
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289 int numNewLines = newLines.length - 1; |
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290 if (newLines[numNewLines][1] is 0) { |
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291 // last inserted line is a new line |
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292 if (endInsert) { |
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293 // insert happening at end of the text, leave numNewLines as |
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294 // is since the last new line will not be concatenated with another |
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295 // line |
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296 numNewLines += 1; |
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297 } else { |
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298 numNewLines -= 1; |
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299 } |
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300 } |
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301 |
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302 // make room for the new lines |
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303 expandLinesBy(numNewLines); |
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304 // shift down the lines after the replace line |
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305 for (int i = lineCount - 1; i > startLine; i--) { |
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306 lines[i + numNewLines]=lines[i]; |
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307 } |
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308 // insert the new lines |
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309 for (int i = 0; i < numNewLines; i++) { |
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310 newLines[i][0] += startLineOffset; |
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311 lines[startLine + i]=newLines[i]; |
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312 } |
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313 // update the last inserted line |
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314 if (numNewLines < newLines.length) { |
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315 newLines[numNewLines][0] += startLineOffset; |
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316 lines[startLine + numNewLines] = newLines[numNewLines]; |
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317 } |
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318 |
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319 lineCount += numNewLines; |
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320 gapLine = getLineAtPhysicalOffset(gapStart); |
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321 } |
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322 /** |
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323 * Moves the gap and adjusts its size in anticipation of a text change. |
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324 * The gap is resized to actual size + the specified size and moved to the given |
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325 * position. |
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326 * <p> |
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327 * |
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328 * @param position the position at which a change is occurring |
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329 * @param size the size of the change |
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330 * @param newGapLine the line where the gap should be put |
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331 */ |
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332 void moveAndResizeGap(int position, int size, int newGapLine) { |
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333 char[] content = null; |
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334 int oldSize = gapEnd - gapStart; |
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335 int newSize; |
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336 if (size > 0) { |
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337 newSize = highWatermark + size; |
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338 } else { |
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339 newSize = lowWatermark - size; |
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340 } |
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341 // remove the old gap from the lines information |
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342 if (gapExists()) { |
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343 // adjust the line length |
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344 lines[gapLine][1] = lines[gapLine][1] - oldSize; |
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345 // adjust the offsets of the lines after the gapLine |
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346 for (int i = gapLine + 1; i < lineCount; i++) { |
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parents:
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347 lines[i][0] = lines[i][0] - oldSize; |
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348 } |
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349 } |
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350 |
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351 if (newSize < 0) { |
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352 if (oldSize > 0) { |
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353 // removing the gap |
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354 content = new char[textStore.length - oldSize]; |
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355 System.arraycopy(textStore, 0, content, 0, gapStart); |
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356 System.arraycopy(textStore, gapEnd, content, gapStart, content.length - gapStart); |
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357 textStore = content; |
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358 } |
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359 gapStart = gapEnd = position; |
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360 return; |
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361 } |
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362 content = new char[textStore.length + (newSize - oldSize)]; |
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363 int newGapStart = position; |
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364 int newGapEnd = newGapStart + newSize; |
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365 if (oldSize is 0) { |
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366 System.arraycopy(textStore, 0, content, 0, newGapStart); |
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367 System.arraycopy(textStore, newGapStart, content, newGapEnd, content.length - newGapEnd); |
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368 } else if (newGapStart < gapStart) { |
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369 int delta = gapStart - newGapStart; |
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370 System.arraycopy(textStore, 0, content, 0, newGapStart); |
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371 System.arraycopy(textStore, newGapStart, content, newGapEnd, delta); |
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372 System.arraycopy(textStore, gapEnd, content, newGapEnd + delta, textStore.length - gapEnd); |
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373 } else { |
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374 int delta = newGapStart - gapStart; |
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375 System.arraycopy(textStore, 0, content, 0, gapStart); |
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376 System.arraycopy(textStore, gapEnd, content, gapStart, delta); |
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377 System.arraycopy(textStore, gapEnd + delta, content, newGapEnd, content.length - newGapEnd); |
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378 } |
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379 textStore = content; |
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380 gapStart = newGapStart; |
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381 gapEnd = newGapEnd; |
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382 |
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383 // add the new gap to the lines information |
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384 if (gapExists()) { |
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385 gapLine = newGapLine; |
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386 // adjust the line length |
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387 int gapLength = gapEnd - gapStart; |
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388 lines[gapLine][1] = lines[gapLine][1] + (gapLength); |
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389 // adjust the offsets of the lines after the gapLine |
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390 for (int i = gapLine + 1; i < lineCount; i++) { |
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391 lines[i][0] = lines[i][0] + gapLength; |
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392 } |
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393 } |
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parents:
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394 } |
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395 /** |
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396 * Returns the number of lines that are in the specified text. |
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397 * <p> |
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398 * |
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399 * @param startOffset the start of the text to lineate |
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parents:
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400 * @param length the length of the text to lineate |
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401 * @return number of lines |
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402 */ |
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403 int lineCount(int startOffset, int length){ |
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parents:
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404 if (length is 0) { |
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405 return 0; |
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406 } |
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parents:
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407 int lineCount = 0; |
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408 int count = 0; |
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409 int i = startOffset; |
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410 if (i >= gapStart) { |
380af2bdd8e5
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parents:
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411 i += gapEnd - gapStart; |
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412 } |
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parents:
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|
413 while (count < length) { |
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parents:
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414 if ((i >= gapStart) && (i < gapEnd)) { |
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parents:
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|
415 // ignore the gap |
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416 } else { |
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417 char ch = textStore[i]; |
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418 if (ch is DWT.CR) { |
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419 // see if the next character is a LF |
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parents:
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420 if (i + 1 < textStore.length) { |
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421 ch = textStore[i+1]; |
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|
422 if (ch is DWT.LF) { |
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|
423 i++; |
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|
424 count++; |
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|
425 } |
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|
426 } |
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427 lineCount++; |
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428 } else if (ch is DWT.LF) { |
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429 lineCount++; |
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|
430 } |
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parents:
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|
431 count++; |
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|
432 } |
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|
433 i++; |
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|
434 } |
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|
435 return lineCount; |
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|
436 } |
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|
437 /** |
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|
438 * Returns the number of lines that are in the specified text. |
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|
439 * <p> |
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|
440 * |
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|
441 * @param text the text to lineate |
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|
442 * @return number of lines in the text |
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|
443 */ |
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|
444 int lineCount(String text){ |
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|
445 int lineCount = 0; |
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446 int length = text.length(); |
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|
447 for (int i = 0; i < length; i++) { |
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parents:
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|
448 char ch = text.charAt(i); |
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parents:
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changeset
|
449 if (ch is DWT.CR) { |
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parents:
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|
450 if (i + 1 < length && text.charAt(i + 1) is DWT.LF) { |
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|
451 i++; |
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|
452 } |
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parents:
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|
453 lineCount++; |
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parents:
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|
454 } else if (ch is DWT.LF) { |
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parents:
diff
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|
455 lineCount++; |
380af2bdd8e5
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|
456 } |
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|
457 } |
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|
458 return lineCount; |
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parents:
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|
459 } |
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parents:
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changeset
|
460 /** |
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|
461 * @return the logical length of the text store |
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|
462 */ |
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|
463 public int getCharCount() { |
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464 int length = gapEnd - gapStart; |
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465 return (textStore.length - length); |
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466 } |
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467 /** |
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468 * Returns the line at <code>index</code> without delimiters. |
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469 * <p> |
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470 * |
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471 * @param index the index of the line to return |
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472 * @return the logical line text (i.e., without the gap) |
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473 * @exception IllegalArgumentException <ul> |
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474 * <li>ERROR_INVALID_ARGUMENT when index is out of range</li> |
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475 * </ul> |
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476 */ |
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477 public String getLine(int index) { |
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478 if ((index >= lineCount) || (index < 0)) error(DWT.ERROR_INVALID_ARGUMENT); |
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479 int start = lines[index][0]; |
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480 int length = lines[index][1]; |
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481 int end = start + length - 1; |
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482 if (!gapExists() || (end < gapStart) || (start >= gapEnd)) { |
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483 // line is before or after the gap |
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484 while ((length - 1 >= 0) && isDelimiter(textStore[start+length-1])) { |
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485 length--; |
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486 } |
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487 return new String(textStore, start, length); |
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488 } else { |
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489 // gap is in the specified range, strip out the gap |
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490 StringBuffer buf = new StringBuffer(); |
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491 int gapLength = gapEnd - gapStart; |
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492 buf.append(textStore, start, gapStart - start); |
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493 buf.append(textStore, gapEnd, length - gapLength - (gapStart - start)); |
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494 length = buf.length(); |
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495 while ((length - 1 >=0) && isDelimiter(buf.charAt(length - 1))) { |
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496 length--; |
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497 } |
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498 return buf.toString().substring(0, length); |
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499 } |
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500 } |
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501 /** |
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502 * Returns the line delimiter that should be used by the StyledText |
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503 * widget when inserting new lines. This delimiter may be different than the |
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504 * delimiter that is used by the <code>StyledTextContent</code> interface. |
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505 * <p> |
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506 * |
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507 * @return the platform line delimiter as specified in the line.separator |
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508 * system property. |
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509 */ |
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510 public String getLineDelimiter() { |
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511 return LineDelimiter; |
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512 } |
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513 /** |
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514 * Returns the line at the given index with delimiters. |
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515 * <p> |
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516 * @param index the index of the line to return |
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517 * @return the logical line text (i.e., without the gap) with delimiters |
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518 */ |
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519 String getFullLine(int index) { |
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520 int start = lines[index][0]; |
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521 int length = lines[index][1]; |
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522 int end = start + length - 1; |
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523 if (!gapExists() || (end < gapStart) || (start >= gapEnd)) { |
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524 // line is before or after the gap |
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525 return new String(textStore, start, length); |
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526 } else { |
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527 // gap is in the specified range, strip out the gap |
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528 StringBuffer buffer = new StringBuffer(); |
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529 int gapLength = gapEnd - gapStart; |
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530 buffer.append(textStore, start, gapStart - start); |
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531 buffer.append(textStore, gapEnd, length - gapLength - (gapStart - start)); |
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532 return buffer.toString(); |
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533 } |
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|
534 } |
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|
535 /** |
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536 * Returns the physical line at the given index (i.e., with delimiters and the gap). |
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|
537 * <p> |
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538 * |
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539 * @param index the line index |
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540 * @return the physical line |
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541 */ |
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542 String getPhysicalLine(int index) { |
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543 int start = lines[index][0]; |
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544 int length = lines[index][1]; |
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545 return getPhysicalText(start, length); |
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546 } |
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|
547 /** |
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548 * @return the number of lines in the text store |
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549 */ |
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550 public int getLineCount(){ |
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551 return lineCount; |
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552 } |
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|
553 /** |
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|
554 * Returns the line at the given offset. |
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555 * <p> |
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556 * |
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557 * @param charPosition logical character offset (i.e., does not include gap) |
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558 * @return the line index |
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559 * @exception IllegalArgumentException <ul> |
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560 * <li>ERROR_INVALID_ARGUMENT when charPosition is out of range</li> |
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561 * </ul> |
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562 */ |
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563 public int getLineAtOffset(int charPosition){ |
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564 if ((charPosition > getCharCount()) || (charPosition < 0)) error(DWT.ERROR_INVALID_ARGUMENT); |
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|
565 int position; |
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566 if (charPosition < gapStart) { |
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567 // position is before the gap |
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|
568 position = charPosition; |
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569 } else { |
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|
570 // position includes the gap |
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571 position = charPosition + (gapEnd - gapStart); |
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572 } |
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|
573 |
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|
574 // if last line and the line is not empty you can ask for |
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575 // a position that doesn't exist (the one to the right of the |
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576 // last character) - for inserting |
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|
577 if (lineCount > 0) { |
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|
578 int lastLine = lineCount - 1; |
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|
579 if (position is lines[lastLine][0] + lines[lastLine][1]) |
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580 return lastLine; |
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|
581 } |
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|
582 |
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parents:
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|
583 int high = lineCount; |
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parents:
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584 int low = -1; |
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parents:
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585 int index = lineCount; |
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parents:
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586 while (high - low > 1) { |
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587 index = (high + low) / 2; |
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|
588 int lineStart = lines[index][0]; |
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parents:
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589 int lineEnd = lineStart + lines[index][1] - 1; |
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|
590 if (position <= lineStart) { |
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|
591 high = index; |
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changeset
|
592 } else if (position <= lineEnd) { |
380af2bdd8e5
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parents:
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|
593 high = index; |
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|
594 break; |
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parents:
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changeset
|
595 } else { |
380af2bdd8e5
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parents:
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596 low = index; |
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597 } |
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598 } |
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599 return high; |
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|
600 } |
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|
601 /** |
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changeset
|
602 * Returns the line index at the given physical offset. |
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|
603 * <p> |
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604 * |
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parents:
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|
605 * @param position physical character offset (i.e., includes gap) |
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606 * @return the line index |
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|
607 */ |
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|
608 int getLineAtPhysicalOffset(int position){ |
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parents:
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|
609 int high = lineCount; |
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parents:
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changeset
|
610 int low = -1; |
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parents:
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|
611 int index = lineCount; |
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612 while (high - low > 1) { |
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613 index = (high + low) / 2; |
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614 int lineStart = lines[index][0]; |
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|
615 int lineEnd = lineStart + lines[index][1] - 1; |
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616 if (position <= lineStart) { |
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617 high = index; |
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618 } else if (position <= lineEnd) { |
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|
619 high = index; |
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|
620 break; |
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parents:
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|
621 } else { |
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622 low = index; |
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623 } |
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624 } |
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625 return high; |
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|
626 } |
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|
627 /** |
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628 * Returns the logical offset of the given line. |
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|
629 * <p> |
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630 * |
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|
631 * @param lineIndex index of line |
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632 * @return the logical starting offset of the line. When there are not any lines, |
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|
633 * getOffsetAtLine(0) is a valid call that should answer 0. |
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|
634 * @exception IllegalArgumentException <ul> |
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|
635 * <li>ERROR_INVALID_ARGUMENT when lineIndex is out of range</li> |
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636 * </ul> |
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|
637 */ |
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|
638 public int getOffsetAtLine(int lineIndex) { |
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|
639 if (lineIndex is 0) return 0; |
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parents:
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640 if ((lineIndex >= lineCount) || (lineIndex < 0)) error(DWT.ERROR_INVALID_ARGUMENT); |
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641 int start = lines[lineIndex][0]; |
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642 if (start > gapEnd) { |
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|
643 return start - (gapEnd - gapStart); |
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644 } else { |
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|
645 return start; |
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|
646 } |
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|
647 } |
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|
648 /** |
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|
649 * Increases the line indexes array to accommodate more lines. |
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|
650 * <p> |
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|
651 * |
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652 * @param numLines the number to increase the array by |
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653 */ |
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|
654 void expandLinesBy(int numLines) { |
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655 int size = lines.length; |
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|
656 if (size - lineCount >= numLines) { |
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|
657 return; |
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|
658 } |
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659 int[][] newLines = new int[size+Math.max(10, numLines)][2]; |
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660 System.arraycopy(lines, 0, newLines, 0, size); |
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661 lines = newLines; |
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662 } |
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663 /** |
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664 * Reports an DWT error. |
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665 * <p> |
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666 * |
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|
667 * @param code the error code |
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|
668 */ |
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|
669 void error (int code) { |
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670 DWT.error(code); |
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671 } |
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|
672 /** |
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673 * Returns whether or not a gap exists in the text store. |
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674 * <p> |
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675 * |
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676 * @return true if gap exists, false otherwise |
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677 */ |
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|
678 bool gapExists() { |
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679 return gapStart !is gapEnd; |
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680 } |
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|
681 /** |
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682 * Returns a String representing the continuous content of |
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683 * the text store. |
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|
684 * <p> |
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|
685 * |
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686 * @param start the physical start offset of the text to return |
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687 * @param length the physical length of the text to return |
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688 * @return the text |
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|
689 */ |
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|
690 String getPhysicalText(int start, int length) { |
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691 return new String(textStore, start, length); |
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692 } |
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|
693 /** |
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694 * Returns a String representing the logical content of |
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695 * the text store (i.e., gap stripped out). |
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|
696 * <p> |
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|
697 * |
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698 * @param start the logical start offset of the text to return |
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|
699 * @param length the logical length of the text to return |
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700 * @return the text |
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701 */ |
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702 public String getTextRange(int start, int length) { |
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703 if (textStore is null) |
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704 return ""; |
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705 if (length is 0) |
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706 return ""; |
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707 int end= start + length; |
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708 if (!gapExists() || (end < gapStart)) |
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709 return new String(textStore, start, length); |
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710 if (gapStart < start) { |
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711 int gapLength= gapEnd - gapStart; |
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712 return new String(textStore, start + gapLength , length); |
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713 } |
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714 StringBuffer buf = new StringBuffer(); |
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715 buf.append(textStore, start, gapStart - start); |
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716 buf.append(textStore, gapEnd, end - gapStart); |
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717 return buf.toString(); |
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718 } |
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719 /** |
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720 * Removes the specified <code>TextChangeListener</code>. |
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721 * <p> |
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722 * |
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723 * @param listener the listener |
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724 * @exception IllegalArgumentException <ul> |
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725 * <li>ERROR_NULL_ARGUMENT when listener is null</li> |
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726 * </ul> |
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727 */ |
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728 public void removeTextChangeListener(TextChangeListener listener){ |
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729 if (listener is null) error(DWT.ERROR_NULL_ARGUMENT); |
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730 for (int i = 0; i < textListeners.size(); i++) { |
7 | 731 TypedListener typedListener = cast(TypedListener) textListeners.elementAt(i); |
0
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732 if (typedListener.getEventListener () is listener) { |
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733 textListeners.removeElementAt(i); |
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734 break; |
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735 } |
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736 } |
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|
737 } |
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738 /** |
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739 * Replaces the text with <code>newText</code> starting at position <code>start</code> |
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740 * for a length of <code>replaceLength</code>. Notifies the appropriate listeners. |
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741 * <p> |
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742 * |
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743 * When sending the TextChangingEvent, <code>newLineCount</code> is the number of |
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744 * lines that are going to be inserted and <code>replaceLineCount</code> is |
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745 * the number of lines that are going to be deleted, based on the change |
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746 * that occurs visually. For example: |
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747 * <ul> |
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748 * <li>(replaceText,newText) ==> (replaceLineCount,newLineCount) |
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749 * <li>("","\n") ==> (0,1) |
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750 * <li>("\n\n","a") ==> (2,0) |
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751 * </ul> |
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752 * </p> |
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753 * |
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754 * @param start start offset of text to replace |
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755 * @param replaceLength start offset of text to replace |
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756 * @param newText start offset of text to replace |
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757 * |
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758 * @exception DWTException <ul> |
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759 * <li>ERROR_INVALID_ARGUMENT when the text change results in a multi byte |
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760 * line delimiter being split or partially deleted. Splitting a line |
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761 * delimiter by inserting text between the CR and LF characters of the |
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762 * \r\n delimiter or deleting part of this line delimiter is not supported</li> |
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763 * </ul> |
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764 */ |
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|
765 public void replaceTextRange(int start, int replaceLength, String newText){ |
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766 // check for invalid replace operations |
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767 if (!isValidReplace(start, replaceLength, newText)) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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768 |
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769 // inform listeners |
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770 StyledTextEvent event = new StyledTextEvent(this); |
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771 event.type = StyledText.TextChanging; |
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|
772 event.start = start; |
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773 event.replaceLineCount = lineCount(start, replaceLength); |
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774 event.text = newText; |
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775 event.newLineCount = lineCount(newText); |
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776 event.replaceCharCount = replaceLength; |
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777 event.newCharCount = newText.length(); |
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|
778 sendTextEvent(event); |
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|
779 |
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780 // first delete the text to be replaced |
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781 delete(start, replaceLength, event.replaceLineCount + 1); |
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782 // then insert the new text |
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783 insert(start, newText); |
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784 // inform listeners |
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785 event = new StyledTextEvent(this); |
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786 event.type = StyledText.TextChanged; |
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|
787 sendTextEvent(event); |
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|
788 } |
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|
789 /** |
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790 * Sends the text listeners the TextChanged event. |
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791 */ |
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792 void sendTextEvent(StyledTextEvent event) { |
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793 for (int i = 0; i < textListeners.size(); i++) { |
7 | 794 (cast(StyledTextListener)textListeners.elementAt(i)).handleEvent(event); |
0
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795 } |
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|
796 } |
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|
797 /** |
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798 * Sets the content to text and removes the gap since there are no sensible predictions |
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799 * about where the next change will occur. |
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800 * <p> |
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|
801 * |
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802 * @param text the text |
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|
803 */ |
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|
804 public void setText (String text){ |
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805 textStore = text.toCharArray(); |
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806 gapStart = -1; |
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807 gapEnd = -1; |
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808 expandExp = 1; |
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809 indexLines(); |
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810 StyledTextEvent event = new StyledTextEvent(this); |
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811 event.type = StyledText.TextSet; |
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812 event.text = ""; |
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|
813 sendTextEvent(event); |
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|
814 } |
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|
815 /** |
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816 * Deletes text. |
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817 * <p> |
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818 * @param position the position at which the text to delete starts |
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819 * @param length the length of the text to delete |
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820 * @param numLines the number of lines that are being deleted |
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821 */ |
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822 void delete(int position, int length, int numLines) { |
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823 if (length is 0) return; |
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824 |
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825 int startLine = getLineAtOffset(position); |
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826 int startLineOffset = getOffsetAtLine(startLine); |
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827 int endLine = getLineAtOffset(position + length); |
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828 |
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829 String endText = ""; |
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830 bool splittingDelimiter = false; |
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831 if (position + length < getCharCount()) { |
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832 endText = getTextRange(position + length - 1, 2); |
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833 if ((endText.charAt(0) is DWT.CR) && (endText.charAt(1) is DWT.LF)) { |
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834 splittingDelimiter = true; |
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835 } |
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836 } |
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837 |
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838 adjustGap(position + length, -length, startLine); |
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839 int [][] oldLines = indexLines(position, length + (gapEnd - gapStart), numLines); |
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840 |
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841 // enlarge the gap - the gap can be enlarged either to the |
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842 // right or left |
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843 if (position + length is gapStart) { |
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844 gapStart -= length; |
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845 } else { |
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846 gapEnd += length; |
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847 } |
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848 |
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849 // figure out the length of the new concatenated line, do so by |
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850 // finding the first line delimiter after position |
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851 int j = position; |
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852 bool eol = false; |
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853 while (j < textStore.length && !eol) { |
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854 if (j < gapStart || j >= gapEnd) { |
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855 char ch = textStore[j]; |
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856 if (isDelimiter(ch)) { |
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857 if (j + 1 < textStore.length) { |
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858 if (ch is DWT.CR && (textStore[j+1] is DWT.LF)) { |
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859 j++; |
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860 } |
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861 } |
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862 eol = true; |
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863 } |
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864 } |
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865 j++; |
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866 } |
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867 // update the line where the deletion started |
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868 lines[startLine][1] = (position - startLineOffset) + (j - position); |
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869 // figure out the number of lines that have been deleted |
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870 int numOldLines = oldLines.length - 1; |
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871 if (splittingDelimiter) numOldLines -= 1; |
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872 // shift up the lines after the last deleted line, no need to update |
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873 // the offset or length of the lines |
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874 for (int i = endLine + 1; i < lineCount; i++) { |
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875 lines[i - numOldLines] = lines[i]; |
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876 } |
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877 lineCount -= numOldLines; |
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878 gapLine = getLineAtPhysicalOffset(gapStart); |
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879 } |
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880 } |