Mercurial > projects > dwt-addons

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
parents
children c4fb132a086c
comparison
equal deleted inserted replaced
128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2000, 2008 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.link.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 /**
24 * Position updater that considers any change in
25 * <code>[p.offset,&nbsp;p.offset&nbsp;+&nbsp;p.length]</code> of a {@link Position}
26 * <code>p</code> as belonging to the position.
27 * <p>
28 * Internal class. Do not use. Public for testing purposes only.
29 * </p>
30 *
31 * @since 3.0
32 * @noinstantiate This class is not intended to be instantiated by clients.
33 * @noextend This class is not intended to be subclassed by clients.
34 */
35 public class InclusivePositionUpdater : IPositionUpdater {
36
37 /** The position category. */
38 private final String fCategory;
39
40 /**
41 * Creates a new updater for the given <code>category</code>.
42 *
43 * @param category the new category.
44 */
45 public InclusivePositionUpdater(String category) {
46 fCategory= category;
47 }
48
49 /*
50 * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent)
51 */
52 public void update(DocumentEvent event) {
53
54 int eventOffset= event.getOffset();
55 int eventOldLength= event.getLength();
56 int eventNewLength= event.getText() is null ? 0 : event.getText().length();
57 int deltaLength= eventNewLength - eventOldLength;
58
59 try {
60 Position[] positions= event.getDocument().getPositions(fCategory);
61
62 for (int i= 0; i !is positions.length; i++) {
63
64 Position position= positions[i];
65
66 if (position.isDeleted())
67 continue;
68
69 int offset= position.getOffset();
70 int length= position.getLength();
71 int end= offset + length;
72
73 if (offset > eventOffset + eventOldLength)
74 // position comes way
75 // after change - shift
76 position.setOffset(offset + deltaLength);
77 else if (end < eventOffset) {
78 // position comes way before change -
79 // leave alone
80 } else if (offset <= eventOffset && end >= eventOffset + eventOldLength) {
81 // event completely internal to the position - adjust length
82 position.setLength(length + deltaLength);
83 } else if (offset < eventOffset) {
84 // event extends over end of position - adjust length
85 int newEnd= eventOffset + eventNewLength;
86 position.setLength(newEnd - offset);
87 } else if (end > eventOffset + eventOldLength) {
88 // event extends from before position into it - adjust offset
89 // and length
90 // offset becomes end of event, length adjusted accordingly
91 // we want to recycle the overlapping part
92 position.setOffset(eventOffset);
93 int deleted= eventOffset + eventOldLength - offset;
94 position.setLength(length - deleted + eventNewLength);
95 } else {
96 // event consumes the position - delete it
97 position.delete();
98 }
99 }
100 } catch (BadPositionCategoryException e) {
101 // ignore and return
102 }
103 }
104
105 /**
106 * Returns the position category.
107 *
108 * @return the position category
109 */
110 public String getCategory() {
111 return fCategory;
112 }
113
114 }