Java Code Examples for org.eclipse.jface.text.source.projection.ProjectionAnnotationModel#getPosition()

/**
 * A semi-hack... This uses stuff that may change at any time in Eclipse.  
 * In the java editor, the projection annotation model contains the collapsible regions which correspond to methods (and other areas
 * such as import groups).
 * 
 * This may work in other editor types as well... TBD
 */
protected int transform(ITextEditor editor, IDocument document, ITextSelection currentSelection,
		ExecutionEvent event) throws BadLocationException {

	ITextViewerExtension viewer = MarkUtils.getITextViewer(editor);
	if (viewer instanceof ProjectionViewer) {
		ProjectionAnnotationModel projection = ((ProjectionViewer)viewer).getProjectionAnnotationModel();
		Iterator<Annotation> pit = projection.getAnnotationIterator();
		while (pit.hasNext()) {
			Position p = projection.getPosition(pit.next());
			if (p.includes(currentSelection.getOffset())) {
				if (isUniversalPresent()) {
					// Do this here to prevent subsequent scrolling once range is revealed
					MarkUtils.setSelection(editor, new TextSelection(document, p.offset, 0));
				}
				// the viewer is pretty much guaranteed to be a TextViewer
				if (viewer instanceof TextViewer) {
					((TextViewer)viewer).revealRange(p.offset, p.length);
				}
				break;
			}
		}
	}
	return NO_OFFSET;		
}
 

/**
 * @param element
 * @param elements
 * @param model
 * @return
 */
protected boolean isInsideLast(PyProjectionAnnotation element, List elements, ProjectionAnnotationModel model) {
    if (elements.size() == 0) {
        return false;
    }

    PyProjectionAnnotation top = (PyProjectionAnnotation) elements.get(elements.size() - 1);
    Position p1 = model.getPosition(element);
    Position pTop = model.getPosition(top);

    int p1Offset = p1.getOffset();

    int pTopoffset = pTop.getOffset();
    int pTopLen = pTopoffset + pTop.getLength();

    if (p1Offset > pTopoffset && p1Offset < pTopLen) {
        return true;
    }
    return false;
}
 

protected Annotation[] mergeFoldingRegions(Collection<FoldedPosition> foldedPositions,
		ProjectionAnnotationModel projectionAnnotationModel) {
	List<Annotation> deletions = new ArrayList<Annotation>();
	for (Iterator<Annotation> iterator = projectionAnnotationModel.getAnnotationIterator(); iterator.hasNext();) {
		Annotation annotation = iterator.next();
		if (annotation instanceof ProjectionAnnotation) {
			Position position = projectionAnnotationModel.getPosition(annotation);
			if (!foldedPositions.remove(position)) {
				deletions.add(annotation);
			}
		}
	}
	return deletions.toArray(new Annotation[deletions.size()]);
}
 

public void updateFoldingStructure(Map<ProjectionAnnotation, Position> annotations)
{
	synchronized (lockUpdateFoldingStructure)
	{
		List<Annotation> deletions = new ArrayList<Annotation>();
		Collection<Position> additions = annotations.values();
		ProjectionAnnotationModel currentModel = getAnnotationModel();
		if (currentModel == null)
		{
			return;
		}
		for (@SuppressWarnings("rawtypes")
		Iterator iter = currentModel.getAnnotationIterator(); iter.hasNext();)
		{
			Object annotation = iter.next();
			if (annotation instanceof ProjectionAnnotation)
			{
				Position position = currentModel.getPosition((Annotation) annotation);
				if (additions.contains(position))
				{
					additions.remove(position);
				}
				else
				{
					deletions.add((Annotation) annotation);
				}
			}
		}
		if (annotations.size() != 0 || deletions.size() != 0)
		{
			currentModel.modifyAnnotations(deletions.toArray(new Annotation[deletions.size()]), annotations, null);
		}
	}
}
 

@Override
public void run(IAction action) {
    PySelection ps = PySelectionFromEditor.createPySelectionFromEditor(getTextEditor());

    ProjectionAnnotationModel model = getTextEditor().getAdapter(
            ProjectionAnnotationModel.class);
    try {
        if (model != null) {
            //put annotations in array list.
            Iterator iter = model.getAnnotationIterator();
            while (iter != null && iter.hasNext()) {
                PyProjectionAnnotation element = (PyProjectionAnnotation) iter.next();
                Position position = model.getPosition(element);

                int line = ps.getDoc().getLineOfOffset(position.offset);

                int start = ps.getStartLineIndex();
                int end = ps.getEndLineIndex();

                for (int i = start; i <= end; i++) {
                    if (i == line) {
                        model.collapse(element);
                        break;
                    }
                }
            }

        }
    } catch (BadLocationException e) {
        Log.log(IStatus.ERROR, "Unexpected error collapsing", e);
    }
}
 

/**
 * We have to be careful not to remove existing annotations because if this happens, previous code folding is not correct.
 */
private Tuple<ProjectionAnnotation, Position> getAnnotationToAdd(Position position, FoldingEntry node,
        ProjectionAnnotationModel model, List<Annotation> existing) {
    for (Iterator<Annotation> iter = existing.iterator(); iter.hasNext();) {
        Annotation element = iter.next();
        Position existingPosition = model.getPosition(element);
        if (existingPosition.equals(position)) {
            //ok, do nothing to this annotation (neither remove nor add, as it already exists in the correct place).
            existing.remove(element);
            return null;
        }
    }
    return new Tuple<ProjectionAnnotation, Position>(new PyProjectionAnnotation(node.getAstEntry(),
            node.isCollapsed), position);
}