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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.templates.InclusivePositionUpdater;
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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 * Position updater that takes any change in [position.offset, position.offset + position.length] as
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24 * belonging to the position.
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25 *
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26 * @since 3.0
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27 */
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28 class InclusivePositionUpdater : IPositionUpdater {
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29
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30 /** The position category. */
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31 private final String fCategory;
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32
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33 /**
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34 * Creates a new updater for the given <code>category</code>.
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35 *
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36 * @param category the new category.
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37 */
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38 public InclusivePositionUpdater(String category) {
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39 fCategory= category;
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40 }
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41
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42 /*
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43 * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent)
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44 */
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45 public void update(DocumentEvent event) {
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46
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47 int eventOffset= event.getOffset();
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48 int eventOldLength= event.getLength();
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49 int eventNewLength= event.getText() is null ? 0 : event.getText().length();
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50 int deltaLength= eventNewLength - eventOldLength;
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51
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52 try {
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53 Position[] positions= event.getDocument().getPositions(fCategory);
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54
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55 for (int i= 0; i !is positions.length; i++) {
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56
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57 Position position= positions[i];
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58
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59 if (position.isDeleted())
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60 continue;
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61
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62 int offset= position.getOffset();
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63 int length= position.getLength();
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64 int end= offset + length;
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65
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66 if (offset > eventOffset + eventOldLength)
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67 // position comes way
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68 // after change - shift
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69 position.setOffset(offset + deltaLength);
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70 else if (end < eventOffset) {
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71 // position comes way before change -
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72 // leave alone
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73 } else if (offset <= eventOffset && end >= eventOffset + eventOldLength) {
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74 // event completely internal to the position - adjust length
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75 position.setLength(length + deltaLength);
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76 } else if (offset < eventOffset) {
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77 // event extends over end of position - adjust length
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78 int newEnd= eventOffset + eventNewLength;
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79 position.setLength(newEnd - offset);
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80 } else if (end > eventOffset + eventOldLength) {
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81 // event extends from before position into it - adjust offset
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82 // and length
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83 // offset becomes end of event, length adjusted accordingly
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84 // we want to recycle the overlapping part
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85 position.setOffset(eventOffset);
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86 int deleted= eventOffset + eventOldLength - offset;
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87 position.setLength(length - deleted + eventNewLength);
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88 } else {
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89 // event consumes the position - delete it
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90 position.delete();
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91 }
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92 }
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93 } catch (BadPositionCategoryException e) {
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94 // ignore and return
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95 }
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96 }
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97
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98 /**
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99 * Returns the position category.
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100 *
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101 * @return the position category
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102 */
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103 public String getCategory() {
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104 return fCategory;
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105 }
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106
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107 }
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