| /******************************************************************************* |
| * Copyright (c) 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * |
| *******************************************************************************/ |
| package org.eclipse.wst.sse.ui.internal.projection; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.Position; |
| import org.eclipse.jface.text.Region; |
| import org.eclipse.jface.text.source.projection.IProjectionPosition; |
| |
| /** |
| * Represents a single folding position in an <code>IStructuredDocument</code> |
| */ |
| public abstract class AbstractStructuredFoldingPosition extends Position implements IProjectionPosition { |
| |
| /** |
| * Default constructor |
| * |
| * @param offset the offset of the folding position |
| * @param length the length of the folidng position |
| */ |
| public AbstractStructuredFoldingPosition(int offset, int length) { |
| super(offset, length); |
| } |
| |
| /** |
| * @see org.eclipse.jface.text.source.projection.IProjectionPosition#computeCaptionOffset(org.eclipse.jface.text.IDocument) |
| */ |
| public int computeCaptionOffset(IDocument document) throws BadLocationException { |
| |
| return 0; |
| } |
| |
| /** |
| * @see org.eclipse.jface.text.source.projection.IProjectionPosition#computeProjectionRegions(org.eclipse.jface.text.IDocument) |
| */ |
| public IRegion[] computeProjectionRegions(IDocument document) throws BadLocationException { |
| |
| int startLineNum = document.getLineOfOffset(getStartOffset()) + 1; |
| IRegion startLine = document.getLineInformation(startLineNum); |
| int endLineNum = document.getLineOfOffset(getEndOffset()) + 1; |
| IRegion endLine = document.getLineInformation(endLineNum); |
| |
| int foldOffset; |
| int foldEndOffset; |
| |
| synchronized (this) { |
| foldOffset = startLine.getOffset(); |
| if(foldOffset < offset) { |
| offset = foldOffset; |
| } |
| |
| foldEndOffset = endLine.getOffset(); |
| |
| if((foldEndOffset-offset) > length) { |
| length = foldEndOffset-offset; |
| } |
| } |
| |
| return new IRegion[] {new Region(foldOffset, foldEndOffset-foldOffset)}; |
| } |
| |
| /** |
| * @return the start offset of the folding position |
| */ |
| protected abstract int getStartOffset(); |
| |
| /** |
| * @return the end offset of the folding position |
| */ |
| protected abstract int getEndOffset(); |
| } |