1 /*******************************************************************************
2 * Copyright (c) 2000, 2004 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Common Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/cpl-v10.html
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 package net.sourceforge.phpdt.internal.ui.text.template.contentassist;
13 import org.eclipse.jface.text.BadPositionCategoryException;
14 import org.eclipse.jface.text.DocumentEvent;
15 import org.eclipse.jface.text.IPositionUpdater;
16 import org.eclipse.jface.text.Position;
19 * Position updater that takes any change in [position.offset, position.offset + position.length] as
20 * belonging to the position.
24 class InclusivePositionUpdater implements IPositionUpdater {
26 /** The position category. */
27 private final String fCategory;
30 * Creates a new updater for the given <code>category</code>.
32 * @param category the new category.
34 public InclusivePositionUpdater(String category) {
39 * @see org.eclipse.jface.text.IPositionUpdater#update(org.eclipse.jface.text.DocumentEvent)
41 public void update(DocumentEvent event) {
43 int eventOffset= event.getOffset();
44 int eventOldLength= event.getLength();
45 int eventNewLength= event.getText() == null ? 0 : event.getText().length();
46 int deltaLength= eventNewLength - eventOldLength;
49 Position[] positions= event.getDocument().getPositions(fCategory);
51 for (int i= 0; i != positions.length; i++) {
53 Position position= positions[i];
55 if (position.isDeleted())
58 int offset= position.getOffset();
59 int length= position.getLength();
60 int end= offset + length;
62 if (offset > eventOffset + eventOldLength)
64 // after change - shift
65 position.setOffset(offset + deltaLength);
66 else if (end < eventOffset) {
67 // position comes way before change -
69 } else if (offset <= eventOffset && end >= eventOffset + eventOldLength) {
70 // event completely internal to the position - adjust length
71 position.setLength(length + deltaLength);
72 } else if (offset < eventOffset) {
73 // event extends over end of position - adjust length
74 int newEnd= eventOffset + eventNewLength;
75 position.setLength(newEnd - offset);
76 } else if (end > eventOffset + eventOldLength) {
77 // event extends from before position into it - adjust offset
79 // offset becomes end of event, length ajusted acordingly
80 // we want to recycle the overlapping part
81 position.setOffset(eventOffset);
82 int deleted= eventOffset + eventOldLength - offset;
83 position.setLength(length - deleted + eventNewLength);
85 // event consumes the position - delete it
89 } catch (BadPositionCategoryException e) {
95 * Returns the position category.
97 * @return the position category
99 public String getCategory() {