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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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15 import dwt.dwthelper.utils;
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16
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17
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18 import dwtx.core.runtime.Assert;
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19 import dwtx.jface.text.BadLocationException;
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20 import dwtx.jface.text.DocumentEvent;
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21 import dwtx.jface.text.IDocument;
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22 import dwtx.jface.text.IDocumentListener;
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23
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24
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25 class UndoCollector : IDocumentListener {
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26
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27 protected UndoEdit undo;
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28 private int fOffset;
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29 private int fLength;
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130
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30
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129
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31 /**
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32 * @since 3.1
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33 */
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34 private String fLastCurrentText;
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35
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130
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36 public this(TextEdit root) {
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129
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37 fOffset= root.getOffset();
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38 fLength= root.getLength();
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39 }
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40
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41 public void connect(IDocument document) {
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42 document.addDocumentListener(this);
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43 undo= new UndoEdit();
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44 }
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45
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46 public void disconnect(IDocument document) {
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47 if (undo !is null) {
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48 document.removeDocumentListener(this);
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49 undo.defineRegion(fOffset, fLength);
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50 }
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51 }
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52
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53 public void documentChanged(DocumentEvent event) {
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54 fLength+= getDelta(event);
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55 }
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56
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57 private static int getDelta(DocumentEvent event) {
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58 String text= event.getText();
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59 return text is null ? -event.getLength() : (text.length() - event.getLength());
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60 }
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61
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62 public void documentAboutToBeChanged(DocumentEvent event) {
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63 int offset= event.getOffset();
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64 int currentLength= event.getLength();
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65 String currentText= null;
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66 try {
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67 currentText= event.getDocument().get(offset, currentLength);
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68 } catch (BadLocationException cannotHappen) {
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69 Assert.isTrue(false, "Can't happen"); //$NON-NLS-1$
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70 }
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130
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71
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129
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72 /*
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73 * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=93634
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74 * If the same string is replaced on many documents (e.g. rename
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75 * package), the size of the undo can be reduced by using the same
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76 * String instance in all edits, instead of using the unique String
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77 * returned from IDocument.get(int, int).
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78 */
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79 if (fLastCurrentText !is null && fLastCurrentText.equals(currentText))
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80 currentText= fLastCurrentText;
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81 else
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82 fLastCurrentText= currentText;
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83
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84 String newText= event.getText();
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85 undo.add(new ReplaceEdit(offset, newText !is null ? newText.length() : 0, currentText));
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86 }
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87 }
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