/*******************************************************************************
* Copyright (c) 2009, 2010 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.css.ui.internal.projection;
import org.eclipse.jface.text.Position;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleRule;
import org.eclipse.wst.sse.core.internal.provisional.IndexedRegion;
import org.eclipse.wst.sse.ui.internal.projection.AbstractStructuredFoldingStrategy;
import java.util.Iterator;
import java.util.List;
/**
* A folding strategy for CSS structured documents. See AbstractStructuredFoldingStrategy for more
* details.
*/
public class CSSFoldingStrategy extends AbstractStructuredFoldingStrategy {
/**
* Create an instance of the folding strategy. Be sure to set the viewer and document after
* creation.
*/
public CSSFoldingStrategy() {
super();
}
/**
* @see org.eclipse.wst.sse.ui.internal.projection.AbstractFoldingStrategy#calcNewFoldPosition(org.eclipse.wst.sse.core.internal.provisional.IndexedRegion)
*/
protected Position calcNewFoldPosition(IndexedRegion indexedRegion) {
Position newPos = null;
//only want to fold regions with a valid range
if (indexedRegion.getStartOffset() >= 0 && indexedRegion.getLength() >= 0) {
newPos = new CSSRuleFoldingPosition(indexedRegion);
}
return newPos;
}
/**
* The same as the AbstractFoldingStrategy implementation except for the new position is
* calculated on the given IndexRegion and not the annotations stored IndexedRegion because of the
* way CSS regions are replaced when they are updated. (non-Javadoc)
*
* @see org.eclipse.wst.sse.ui.internal.projection.AbstractStructuredFoldingStrategy#updateAnnotations(java.util.Iterator,
* org.eclipse.wst.sse.core.internal.provisional.IndexedRegion, java.util.List,
* java.util.List)
*/
protected void updateAnnotations(Iterator existingAnnotationsIter, IndexedRegion dirtyRegion,
List modifications, List deletions) {
while (existingAnnotationsIter.hasNext()) {
Object obj = existingAnnotationsIter.next();
if (obj instanceof FoldingAnnotation) {
FoldingAnnotation annotation = (FoldingAnnotation) obj;
//NOTE can not use the annotations stored region because the CSSStructuredDocument
// replaces the old region with a new one when it is modified
Position newPos = calcNewFoldPosition(annotation.getRegion());
if (newPos != null) {
Position oldPos = fProjectionAnnotationModel.getPosition(annotation);
if (!newPos.equals(oldPos)) {
oldPos.setOffset(newPos.offset);
oldPos.setLength(newPos.length);
modifications.add(annotation);
}
} else {
deletions.add(annotation);
}
}
}
}
/**
* @see org.eclipse.wst.sse.ui.internal.projection.AbstractFoldingStrategy#indexedRegionValidType(org.eclipse.wst.sse.core.internal.provisional.IndexedRegion)
*/
protected boolean indexedRegionValidType(IndexedRegion indexedRegion) {
return (indexedRegion instanceof ICSSStyleRule);
}
}