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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 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.text.projection.FragmentUpdater;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18 import dwtx.jface.text.BadLocationException;
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19 import dwtx.jface.text.BadPositionCategoryException;
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20 import dwtx.jface.text.DefaultPositionUpdater;
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21 import dwtx.jface.text.DocumentEvent;
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22 import dwtx.jface.text.IDocument;
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23 import dwtx.jface.text.Position;
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24
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25
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26 /**
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27 * The position updater used to adapt the fragments of a master document. If an
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28 * insertion happens at a fragment's offset, the fragment is extended rather
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29 * than shifted. Also, the last fragment is extended if an insert operation
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30 * happens at the end of the fragment.
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31 *
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32 * @since 3.0
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33 */
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34 class FragmentUpdater : DefaultPositionUpdater {
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35
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36 /** Indicates whether the position being updated represents the last fragment. */
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37 private bool fIsLast= false;
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38
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39 /**
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40 * Creates the fragment updater for the given category.
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41 *
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42 * @param fragmentCategory the position category used for managing the fragments of a document
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43 */
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44 protected FragmentUpdater(String fragmentCategory) {
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45 super(fragmentCategory);
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46 }
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47
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48 /*
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49 * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent)
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50 */
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51 public void update(DocumentEvent event) {
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52
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53 try {
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54
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55 Position[] category= event.getDocument().getPositions(getCategory());
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56
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57 fOffset= event.getOffset();
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58 fLength= event.getLength();
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59 fReplaceLength= (event.getText() is null ? 0 : event.getText().length());
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60 fDocument= event.getDocument();
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61
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62 for (int i= 0; i < category.length; i++) {
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63
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64 fPosition= category[i];
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65 fIsLast= (i is category.length -1);
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66
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67 fOriginalPosition.offset= fPosition.offset;
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68 fOriginalPosition.length= fPosition.length;
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69
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70 if (notDeleted())
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71 adaptToReplace();
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72 }
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73
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74 } catch (BadPositionCategoryException x) {
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75 // do nothing
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76 }
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77 }
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78
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79 /*
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80 * @see dwtx.jface.text.DefaultPositionUpdater#adaptToInsert()
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81 */
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82 protected void adaptToInsert() {
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83 int myStart= fPosition.offset;
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84 int myEnd= Math.max(myStart, fPosition.offset + fPosition.length - (fIsLast || isAffectingReplace() ? 0 : 1));
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85
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86 if (myEnd < fOffset)
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87 return;
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88
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89 if (fLength <= 0) {
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90
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91 if (myStart <= fOffset)
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92 fPosition.length += fReplaceLength;
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93 else
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94 fPosition.offset += fReplaceLength;
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95
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96 } else {
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97
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98 if (myStart <= fOffset && fOriginalPosition.offset <= fOffset)
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99 fPosition.length += fReplaceLength;
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100 else
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101 fPosition.offset += fReplaceLength;
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102 }
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103 }
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104
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105 /**
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106 * Returns whether this updater considers any position affected by the given document event. A
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107 * position is affected if <code>event</code> {@link Position#overlapsWith(int, int) overlaps}
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108 * with it but not if the position is only shifted.
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109 *
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110 * @param event the event
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111 * @return <code>true</code> if there is any affected position, <code>false</code> otherwise
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112 */
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113 public bool affectsPositions(DocumentEvent event) {
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114 IDocument document= event.getDocument();
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115 try {
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116
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117 int index= document.computeIndexInCategory(getCategory(), event.getOffset());
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118 Position[] fragments= document.getPositions(getCategory());
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119
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120 if (0 < index) {
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121 Position fragment= fragments[index - 1];
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122 if (fragment.overlapsWith(event.getOffset(), event.getLength()))
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123 return true;
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124 if (index is fragments.length && fragment.offset + fragment.length is event.getOffset())
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125 return true;
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126 }
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127
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128 if (index < fragments.length) {
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129 Position fragment= fragments[index];
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130 return fragment.overlapsWith(event.getOffset(), event.getLength());
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131 }
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132
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133 } catch (BadLocationException x) {
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134 } catch (BadPositionCategoryException x) {
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135 }
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136
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137 return false;
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138 }
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139 }
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