| david_williams | cfdb2cd | 2004-11-11 08:37:49 +0000 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Copyright (c) 2001, 2004 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 | * Jens Lukowski/Innoopract - initial renaming/restructuring |
| 11 | * |
| 12 | *******************************************************************************/ |
| david_williams | 68bf9b3 | 2005-03-26 04:29:10 +0000 | [diff] [blame] | 13 | package org.eclipse.wst.sse.core.internal.text; |
| david_williams | cfdb2cd | 2004-11-11 08:37:49 +0000 | [diff] [blame] | 14 | |
| 15 | import org.eclipse.jface.text.BadPositionCategoryException; |
| 16 | import org.eclipse.jface.text.DefaultPositionUpdater; |
| 17 | |
| 18 | /** |
| 19 | * Follows the behavior of DefaultPositionUpdater except in addition to |
| 20 | * deleting/overwriting text which completely contains the position deletes |
| 21 | * the position, deleting text that equals the text in position also deletes |
| 22 | * the position. |
| 23 | * |
| 24 | * @see org.eclipse.jface.text.DefaultPositionUpdater |
| 25 | */ |
| 26 | public class DeleteEqualPositionUpdater extends DefaultPositionUpdater { |
| 27 | |
| 28 | /** |
| 29 | * @param category |
| 30 | */ |
| 31 | public DeleteEqualPositionUpdater(String category) { |
| 32 | super(category); |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Determines whether the currently investigated position has been deleted |
| 37 | * by the replace operation specified in the current event. If so, it |
| 38 | * deletes the position and removes it from the document's position |
| 39 | * category. |
| 40 | * |
| 41 | * NOTE: position is deleted if current event completely overwrites |
| 42 | * position OR if current event deletes the area surrounding/including the |
| 43 | * position |
| 44 | * |
| 45 | * @return <code>true</code> if position has been deleted |
| 46 | */ |
| 47 | protected boolean notDeleted() { |
| 48 | // position is deleted if current event completely overwrites position |
| 49 | // OR if |
| 50 | // current event deletes the area surrounding/including the position |
| 51 | if ((fOffset < fPosition.offset && (fPosition.offset + fPosition.length < fOffset + fLength)) || (fOffset <= fPosition.offset && (fPosition.offset + fPosition.length <= fOffset + fLength) && fReplaceLength == 0)) { |
| 52 | |
| 53 | fPosition.delete(); |
| 54 | |
| 55 | try { |
| 56 | fDocument.removePosition(getCategory(), fPosition); |
| 57 | } catch (BadPositionCategoryException x) { |
| 58 | } |
| 59 | |
| 60 | return false; |
| 61 | } |
| 62 | |
| 63 | return true; |
| 64 | } |
| 65 | |
| 66 | } |