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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * 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.text.edits.UndoCollector;
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14
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131
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15 import dwtx.text.edits.MultiTextEdit; // packageimport
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16 import dwtx.text.edits.CopySourceEdit; // packageimport
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17 import dwtx.text.edits.MoveSourceEdit; // packageimport
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18 import dwtx.text.edits.CopyingRangeMarker; // packageimport
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19 import dwtx.text.edits.ReplaceEdit; // packageimport
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20 import dwtx.text.edits.EditDocument; // packageimport
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21 import dwtx.text.edits.DeleteEdit; // packageimport
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22 import dwtx.text.edits.MoveTargetEdit; // packageimport
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23 import dwtx.text.edits.CopyTargetEdit; // packageimport
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24 import dwtx.text.edits.TextEditCopier; // packageimport
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25 import dwtx.text.edits.ISourceModifier; // packageimport
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26 import dwtx.text.edits.TextEditMessages; // packageimport
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27 import dwtx.text.edits.TextEditProcessor; // packageimport
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28 import dwtx.text.edits.MalformedTreeException; // packageimport
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29 import dwtx.text.edits.TreeIterationInfo; // packageimport
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30 import dwtx.text.edits.TextEditVisitor; // packageimport
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31 import dwtx.text.edits.TextEditGroup; // packageimport
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32 import dwtx.text.edits.TextEdit; // packageimport
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33 import dwtx.text.edits.RangeMarker; // packageimport
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34 import dwtx.text.edits.UndoEdit; // packageimport
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35 import dwtx.text.edits.InsertEdit; // packageimport
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36
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37
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129
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38 import dwt.dwthelper.utils;
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39
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40
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41 import dwtx.core.runtime.Assert;
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42 import dwtx.jface.text.BadLocationException;
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43 import dwtx.jface.text.DocumentEvent;
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44 import dwtx.jface.text.IDocument;
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45 import dwtx.jface.text.IDocumentListener;
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46
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47
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48 class UndoCollector : IDocumentListener {
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49
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50 protected UndoEdit undo;
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159
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51
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52 package UndoEdit undo_package(){
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53 return undo;
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54 }
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55
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129
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56 private int fOffset;
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57 private int fLength;
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130
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58
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129
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59 /**
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60 * @since 3.1
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61 */
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62 private String fLastCurrentText;
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63
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130
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64 public this(TextEdit root) {
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129
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65 fOffset= root.getOffset();
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66 fLength= root.getLength();
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67 }
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68
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69 public void connect(IDocument document) {
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70 document.addDocumentListener(this);
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71 undo= new UndoEdit();
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72 }
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73
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74 public void disconnect(IDocument document) {
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75 if (undo !is null) {
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76 document.removeDocumentListener(this);
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77 undo.defineRegion(fOffset, fLength);
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78 }
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79 }
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80
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81 public void documentChanged(DocumentEvent event) {
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82 fLength+= getDelta(event);
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83 }
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84
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85 private static int getDelta(DocumentEvent event) {
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86 String text= event.getText();
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87 return text is null ? -event.getLength() : (text.length() - event.getLength());
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88 }
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89
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90 public void documentAboutToBeChanged(DocumentEvent event) {
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91 int offset= event.getOffset();
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92 int currentLength= event.getLength();
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93 String currentText= null;
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94 try {
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95 currentText= event.getDocument().get(offset, currentLength);
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96 } catch (BadLocationException cannotHappen) {
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97 Assert.isTrue(false, "Can't happen"); //$NON-NLS-1$
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98 }
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130
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99
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129
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100 /*
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101 * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=93634
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102 * If the same string is replaced on many documents (e.g. rename
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103 * package), the size of the undo can be reduced by using the same
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104 * String instance in all edits, instead of using the unique String
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105 * returned from IDocument.get(int, int).
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106 */
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107 if (fLastCurrentText !is null && fLastCurrentText.equals(currentText))
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108 currentText= fLastCurrentText;
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109 else
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110 fLastCurrentText= currentText;
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111
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112 String newText= event.getText();
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113 undo.add(new ReplaceEdit(offset, newText !is null ? newText.length() : 0, currentText));
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114 }
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115 }
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