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comparison dwtx/jface/text/templates/InclusivePositionUpdater.d @ 129:eb30df5ca28b

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Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
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128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.jface.text.templates.InclusivePositionUpdater;
14
15 import dwt.dwthelper.utils;
16
17 import dwtx.jface.text.BadPositionCategoryException;
18 import dwtx.jface.text.DocumentEvent;
19 import dwtx.jface.text.IPositionUpdater;
20 import dwtx.jface.text.Position;
21
22 /**
23 * Position updater that takes any change in [position.offset, position.offset + position.length] as
24 * belonging to the position.
25 *
26 * @since 3.0
27 */
28 class InclusivePositionUpdater : IPositionUpdater {
29
30 /** The position category. */
31 private final String fCategory;
32
33 /**
34 * Creates a new updater for the given <code>category</code>.
35 *
36 * @param category the new category.
37 */
38 public InclusivePositionUpdater(String category) {
39 fCategory= category;
40 }
41
42 /*
43 * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent)
44 */
45 public void update(DocumentEvent event) {
46
47 int eventOffset= event.getOffset();
48 int eventOldLength= event.getLength();
49 int eventNewLength= event.getText() is null ? 0 : event.getText().length();
50 int deltaLength= eventNewLength - eventOldLength;
51
52 try {
53 Position[] positions= event.getDocument().getPositions(fCategory);
54
55 for (int i= 0; i !is positions.length; i++) {
56
57 Position position= positions[i];
58
59 if (position.isDeleted())
60 continue;
61
62 int offset= position.getOffset();
63 int length= position.getLength();
64 int end= offset + length;
65
66 if (offset > eventOffset + eventOldLength)
67 // position comes way
68 // after change - shift
69 position.setOffset(offset + deltaLength);
70 else if (end < eventOffset) {
71 // position comes way before change -
72 // leave alone
73 } else if (offset <= eventOffset && end >= eventOffset + eventOldLength) {
74 // event completely internal to the position - adjust length
75 position.setLength(length + deltaLength);
76 } else if (offset < eventOffset) {
77 // event extends over end of position - adjust length
78 int newEnd= eventOffset + eventNewLength;
79 position.setLength(newEnd - offset);
80 } else if (end > eventOffset + eventOldLength) {
81 // event extends from before position into it - adjust offset
82 // and length
83 // offset becomes end of event, length adjusted accordingly
84 // we want to recycle the overlapping part
85 position.setOffset(eventOffset);
86 int deleted= eventOffset + eventOldLength - offset;
87 position.setLength(length - deleted + eventNewLength);
88 } else {
89 // event consumes the position - delete it
90 position.delete();
91 }
92 }
93 } catch (BadPositionCategoryException e) {
94 // ignore and return
95 }
96 }
97
98 /**
99 * Returns the position category.
100 *
101 * @return the position category
102 */
103 public String getCategory() {
104 return fCategory;
105 }
106
107 }