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1 /*******************************************************************************
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2 * Copyright (c) 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.internal.text.NonDeletingPositionUpdater;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.jface.text.BadPositionCategoryException;
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18 import dwtx.jface.text.DocumentEvent;
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19 import dwtx.jface.text.IPositionUpdater;
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20 import dwtx.jface.text.Position;
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21
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22
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23 /**
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24 * A position updater that never deletes a position. If the region containing
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25 * the position is deleted, the position is moved to the beginning/end (falling
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26 * together) of the change. If the region containing the position is replaced,
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27 * the position is placed at the same location inside the replacement text, but
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28 * always inside the replacement text.
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29 *
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30 * @since 3.1
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31 */
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32 public final class NonDeletingPositionUpdater : IPositionUpdater {
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33 /** The position category. */
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34 private final String fCategory;
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35
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36 /**
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37 * Creates a new updater for the given <code>category</code>.
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38 *
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39 * @param category the new category.
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40 */
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41 public NonDeletingPositionUpdater(String category) {
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42 fCategory= category;
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43 }
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44
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45 /*
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46 * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent)
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47 */
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48 public void update(DocumentEvent event) {
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49
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50 int eventOffset= event.getOffset();
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51 int eventOldEndOffset= eventOffset + event.getLength();
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52 int eventNewLength= event.getText() is null ? 0 : event.getText().length();
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53 int eventNewEndOffset= eventOffset + eventNewLength;
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54 int deltaLength= eventNewLength - event.getLength();
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55
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56 try {
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57 Position[] positions= event.getDocument().getPositions(fCategory);
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58
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59 for (int i= 0; i !is positions.length; i++) {
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60
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61 Position position= positions[i];
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62
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63 if (position.isDeleted())
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64 continue;
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65
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66 int offset= position.getOffset();
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67 int length= position.getLength();
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68 int end= offset + length;
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69
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70 if (offset > eventOldEndOffset) {
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71 // position comes way after change - shift
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72 position.setOffset(offset + deltaLength);
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73 } else if (end < eventOffset) {
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74 // position comes way before change - leave alone
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75 } else if (offset <= eventOffset && end >= eventOldEndOffset) {
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76 // event completely internal to the position - adjust length
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77 position.setLength(length + deltaLength);
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78 } else if (offset < eventOffset) {
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79 // event extends over end of position - include the
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80 // replacement text into the position
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81 position.setLength(eventNewEndOffset - offset);
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82 } else if (end > eventOldEndOffset) {
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83 // event extends from before position into it - adjust
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84 // offset and length, including the replacement text into
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85 // the position
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86 position.setOffset(eventOffset);
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87 int deleted= eventOldEndOffset - offset;
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88 position.setLength(length - deleted + eventNewLength);
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89 } else {
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90 // event comprises the position - keep it at the same
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91 // position, but always inside the replacement text
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92 int newOffset= Math.min(offset, eventNewEndOffset);
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93 int newEndOffset= Math.min(end, eventNewEndOffset);
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94 position.setOffset(newOffset);
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95 position.setLength(newEndOffset - newOffset);
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96 }
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97 }
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98 } catch (BadPositionCategoryException e) {
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99 // ignore and return
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100 }
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101 }
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102
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103 /**
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104 * Returns the position category.
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105 *
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106 * @return the position category
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107 */
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108 public String getCategory() {
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109 return fCategory;
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110 }
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111 }
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