--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/source/AnnotationRulerColumn.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,959 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2008 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
+ *     Nikolay Botev <bono8106@hotmail.com> - [projection] Editor loses keyboard focus when expanding folded region - https://bugs.eclipse.org/bugs/show_bug.cgi?id=184255
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.source.AnnotationRulerColumn;
+
+import dwt.dwthelper.utils;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import dwt.DWT;
+import dwt.custom.StyledText;
+import dwt.events.DisposeEvent;
+import dwt.events.DisposeListener;
+import dwt.events.MouseEvent;
+import dwt.events.MouseListener;
+import dwt.events.MouseMoveListener;
+import dwt.events.PaintEvent;
+import dwt.events.PaintListener;
+import dwt.graphics.Cursor;
+import dwt.graphics.Font;
+import dwt.graphics.GC;
+import dwt.graphics.Image;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+import dwt.widgets.Canvas;
+import dwt.widgets.Composite;
+import dwt.widgets.Control;
+import dwt.widgets.Display;
+import dwtx.jface.text.BadLocationException;
+import dwtx.jface.text.IDocument;
+import dwtx.jface.text.IRegion;
+import dwtx.jface.text.ITextListener;
+import dwtx.jface.text.ITextViewer;
+import dwtx.jface.text.ITextViewerExtension5;
+import dwtx.jface.text.IViewportListener;
+import dwtx.jface.text.JFaceTextUtil;
+import dwtx.jface.text.Position;
+import dwtx.jface.text.TextEvent;
+
+
+/**
+ * A vertical ruler column showing graphical representations of annotations.
+ * Will become final.
+ * <p>
+ * Do not subclass.
+ * </p>
+ *
+ * @since 2.0
+ */
+public class AnnotationRulerColumn : IVerticalRulerColumn, IVerticalRulerInfo, IVerticalRulerInfoExtension {
+
+    /**
+     * Internal listener class.
+     */
+    class InternalListener : IViewportListener, IAnnotationModelListener, ITextListener {
+
+        /*
+         * @see IViewportListener#viewportChanged(int)
+         */
+        public void viewportChanged(int verticalPosition) {
+            if (verticalPosition !is fScrollPos)
+                redraw();
+        }
+
+        /*
+         * @see IAnnotationModelListener#modelChanged(IAnnotationModel)
+         */
+        public void modelChanged(IAnnotationModel model) {
+            postRedraw();
+        }
+
+        /*
+         * @see ITextListener#textChanged(TextEvent)
+         */
+        public void textChanged(TextEvent e) {
+            if (e.getViewerRedrawState())
+                postRedraw();
+        }
+    }
+
+    /**
+     * Implementation of <code>IRegion</code> that can be reused
+     * by setting the offset and the length.
+     */
+    private static class ReusableRegion : Position , IRegion {}
+
+    /**
+     * Pair of an annotation and their associated position. Used inside the paint method
+     * for sorting annotations based on the offset of their position.
+     * @since 3.0
+     */
+    private static class Tuple {
+        Annotation annotation;
+        Position position;
+
+        Tuple(Annotation annotation, Position position) {
+            this.annotation= annotation;
+            this.position= position;
+        }
+    }
+
+    /**
+     * Comparator for <code>Tuple</code>s.
+     * @since 3.0
+     */
+    private static class TupleComparator : Comparator {
+        /*
+         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
+         */
+        public int compare(Object o1, Object o2) {
+            Position p1= ((Tuple) o1).position;
+            Position p2= ((Tuple) o2).position;
+            return p1.getOffset() - p2.getOffset();
+        }
+    }
+
+    /** This column's parent ruler */
+    private CompositeRuler fParentRuler;
+    /** The cached text viewer */
+    private ITextViewer fCachedTextViewer;
+    /** The cached text widget */
+    private StyledText fCachedTextWidget;
+    /** The ruler's canvas */
+    private Canvas fCanvas;
+    /** The vertical ruler's model */
+    private IAnnotationModel fModel;
+    /** Cache for the actual scroll position in pixels */
+    private int fScrollPos;
+    /** The buffer for double buffering */
+    private Image fBuffer;
+    /** The internal listener */
+    private InternalListener fInternalListener= new InternalListener();
+    /** The width of this vertical ruler */
+    private int fWidth;
+    /** Switch for enabling/disabling the setModel method. */
+    private bool fAllowSetModel= true;
+    /**
+     * The list of annotation types to be shown in this ruler.
+     * @since 3.0
+     */
+    private Set fConfiguredAnnotationTypes= new HashSet();
+    /**
+     * The list of allowed annotation types to be shown in this ruler.
+     * An allowed annotation type maps to <code>true</code>, a disallowed
+     * to <code>false</code>.
+     * @since 3.0
+     */
+    private Map fAllowedAnnotationTypes= new HashMap();
+    /**
+     * The annotation access extension.
+     * @since 3.0
+     */
+    private IAnnotationAccessExtension fAnnotationAccessExtension;
+    /**
+     * The hover for this column.
+     * @since 3.0
+     */
+    private IAnnotationHover fHover;
+    /**
+     * The cached annotations.
+     * @since 3.0
+     */
+    private List fCachedAnnotations= new ArrayList();
+    /**
+     * The comparator for sorting annotations according to the offset of their position.
+     * @since 3.0
+     */
+    private Comparator fTupleComparator= new TupleComparator();
+    /**
+     * The hit detection cursor.
+     * @since 3.0
+     */
+    private Cursor fHitDetectionCursor;
+    /**
+     * The last cursor.
+     * @since 3.0
+     */
+    private Cursor fLastCursor;
+    /**
+     * This ruler's mouse listener.
+     * @since 3.0
+     */
+    private MouseListener fMouseListener;
+
+    /**
+     * Constructs this column with the given arguments.
+     *
+     * @param model the annotation model to get the annotations from
+     * @param width the width of the vertical ruler
+     * @param annotationAccess the annotation access
+     * @since 3.0
+     */
+    public AnnotationRulerColumn(IAnnotationModel model, int width, IAnnotationAccess annotationAccess) {
+        this(width, annotationAccess);
+        fAllowSetModel= false;
+        fModel= model;
+        fModel.addAnnotationModelListener(fInternalListener);
+    }
+
+    /**
+     * Constructs this column with the given arguments.
+     *
+     * @param width the width of the vertical ruler
+     * @param annotationAccess the annotation access
+     * @since 3.0
+     */
+    public AnnotationRulerColumn(int width, IAnnotationAccess annotationAccess) {
+        fWidth= width;
+        if (annotationAccess instanceof IAnnotationAccessExtension)
+            fAnnotationAccessExtension= (IAnnotationAccessExtension) annotationAccess;
+    }
+
+    /**
+     * Constructs this column with the given arguments.
+     *
+     * @param model the annotation model to get the annotations from
+     * @param width the width of the vertical ruler
+     */
+    public AnnotationRulerColumn(IAnnotationModel model, int width) {
+        fWidth= width;
+        fAllowSetModel= false;
+        fModel= model;
+        fModel.addAnnotationModelListener(fInternalListener);
+    }
+
+    /**
+     * Constructs this column with the given width.
+     *
+     * @param width the width of the vertical ruler
+     */
+    public AnnotationRulerColumn(int width) {
+        fWidth= width;
+    }
+
+    /*
+     * @see IVerticalRulerColumn#getControl()
+     */
+    public Control getControl() {
+        return fCanvas;
+    }
+
+    /*
+     * @see IVerticalRulerColumn#getWidth()
+     */
+    public int getWidth() {
+        return fWidth;
+    }
+
+    /*
+     * @see IVerticalRulerColumn#createControl(CompositeRuler, Composite)
+     */
+    public Control createControl(CompositeRuler parentRuler, Composite parentControl) {
+
+        fParentRuler= parentRuler;
+        fCachedTextViewer= parentRuler.getTextViewer();
+        fCachedTextWidget= fCachedTextViewer.getTextWidget();
+
+        fHitDetectionCursor= new Cursor(parentControl.getDisplay(), DWT.CURSOR_HAND);
+
+        fCanvas= createCanvas(parentControl);
+
+        fCanvas.addPaintListener(new PaintListener() {
+            public void paintControl(PaintEvent event) {
+                if (fCachedTextViewer !is null)
+                    doubleBufferPaint(event.gc);
+            }
+        });
+
+        fCanvas.addDisposeListener(new DisposeListener() {
+            public void widgetDisposed(DisposeEvent e) {
+                handleDispose();
+                fCachedTextViewer= null;
+                fCachedTextWidget= null;
+            }
+        });
+
+        fMouseListener= new MouseListener() {
+            public void mouseUp(MouseEvent event) {
+                int lineNumber;
+                if (isPropagatingMouseListener()) {
+                    fParentRuler.setLocationOfLastMouseButtonActivity(event.x, event.y);
+                    lineNumber= fParentRuler.getLineOfLastMouseButtonActivity();
+                } else
+                    lineNumber= fParentRuler.toDocumentLineNumber(event.y);
+
+                if (1 is event.button)
+                    mouseClicked(lineNumber);
+            }
+
+            public void mouseDown(MouseEvent event) {
+                if (isPropagatingMouseListener())
+                    fParentRuler.setLocationOfLastMouseButtonActivity(event.x, event.y);
+            }
+
+            public void mouseDoubleClick(MouseEvent event) {
+                int lineNumber;
+                if (isPropagatingMouseListener()) {
+                    fParentRuler.setLocationOfLastMouseButtonActivity(event.x, event.y);
+                    lineNumber= fParentRuler.getLineOfLastMouseButtonActivity();
+                } else
+                    lineNumber= fParentRuler.toDocumentLineNumber(event.y);
+
+                if (1 is event.button)
+                    mouseDoubleClicked(lineNumber);
+            }
+        };
+        fCanvas.addMouseListener(fMouseListener);
+
+        fCanvas.addMouseMoveListener(new MouseMoveListener() {
+            /*
+             * @see dwt.events.MouseMoveListener#mouseMove(dwt.events.MouseEvent)
+             * @since 3.0
+             */
+            public void mouseMove(MouseEvent e) {
+                handleMouseMove(e);
+            }
+        });
+
+        if (fCachedTextViewer !is null) {
+            fCachedTextViewer.addViewportListener(fInternalListener);
+            fCachedTextViewer.addTextListener(fInternalListener);
+        }
+
+        return fCanvas;
+    }
+
+    /**
+     * Creates a canvas with the given parent.
+     *
+     * @param parent the parent
+     * @return the created canvas
+     */
+    private Canvas createCanvas(Composite parent) {
+        return new Canvas(parent, DWT.NO_BACKGROUND | DWT.NO_FOCUS) {
+            /*
+             * @see dwt.widgets.Control#addMouseListener(dwt.events.MouseListener)
+             * @since 3.0
+             */
+            public void addMouseListener(MouseListener listener) {
+                if (isPropagatingMouseListener() || listener is fMouseListener)
+                    super.addMouseListener(listener);
+            }
+        };
+    }
+
+    /**
+     * Tells whether this ruler column propagates mouse listener
+     * events to its parent.
+     *
+     * @return <code>true</code> if propagating to parent
+     * @since 3.0
+     */
+    protected bool isPropagatingMouseListener() {
+        return true;
+    }
+
+    /**
+     * Hook method for a mouse double click event on the given ruler line.
+     *
+     * @param rulerLine the ruler line
+     */
+    protected void mouseDoubleClicked(int rulerLine) {
+    }
+
+    /**
+     * Hook method for a mouse click event on the given ruler line.
+     *
+     * @param rulerLine the ruler line
+     * @since 3.0
+     */
+    protected void mouseClicked(int rulerLine) {
+    }
+
+    /**
+     * Handles mouse moves.
+     *
+     * @param event the mouse move event
+     */
+    private void handleMouseMove(MouseEvent event) {
+        fParentRuler.setLocationOfLastMouseButtonActivity(event.x, event.y);
+        if (fCachedTextViewer !is null) {
+            int line= toDocumentLineNumber(event.y);
+            Cursor cursor= (hasAnnotation(line) ? fHitDetectionCursor : null);
+            if (cursor !is fLastCursor) {
+                fCanvas.setCursor(cursor);
+                fLastCursor= cursor;
+            }
+        }
+    }
+
+    /**
+     * Tells whether the given line contains an annotation.
+     *
+     * @param lineNumber the line number
+     * @return <code>true</code> if the given line contains an annotation
+     */
+    protected bool hasAnnotation(int lineNumber) {
+
+        IAnnotationModel model= fModel;
+        if (fModel instanceof IAnnotationModelExtension)
+            model= ((IAnnotationModelExtension)fModel).getAnnotationModel(SourceViewer.MODEL_ANNOTATION_MODEL);
+
+        if (model is null)
+            return false;
+
+        IRegion line;
+        try {
+            IDocument d= fCachedTextViewer.getDocument();
+            if (d is null)
+                return false;
+            
+            line= d.getLineInformation(lineNumber);
+        }  catch (BadLocationException ex) {
+            return false;
+        }
+
+        int lineStart= line.getOffset();
+        int lineLength= line.getLength();
+
+        Iterator e;
+        if (fModel instanceof IAnnotationModelExtension2)
+            e= ((IAnnotationModelExtension2)fModel).getAnnotationIterator(lineStart, lineLength + 1, true, true);
+        else
+            e= model.getAnnotationIterator();
+
+        while (e.hasNext()) {
+            Annotation a= (Annotation) e.next();
+
+            if (a.isMarkedDeleted())
+                continue;
+
+            if (skip(a))
+                continue;
+
+            Position p= model.getPosition(a);
+            if (p is null || p.isDeleted())
+                continue;
+
+            if (p.overlapsWith(lineStart, lineLength) || p.length is 0 && p.offset is lineStart + lineLength)
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Disposes the ruler's resources.
+     */
+    private void handleDispose() {
+
+        if (fCachedTextViewer !is null) {
+            fCachedTextViewer.removeViewportListener(fInternalListener);
+            fCachedTextViewer.removeTextListener(fInternalListener);
+        }
+
+        if (fModel !is null)
+            fModel.removeAnnotationModelListener(fInternalListener);
+
+        if (fBuffer !is null) {
+            fBuffer.dispose();
+            fBuffer= null;
+        }
+
+        if (fHitDetectionCursor !is null) {
+            fHitDetectionCursor.dispose();
+            fHitDetectionCursor= null;
+        }
+
+        fConfiguredAnnotationTypes.clear();
+        fAllowedAnnotationTypes.clear();
+        fAnnotationAccessExtension= null;
+    }
+
+    /**
+     * Double buffer drawing.
+     *
+     * @param dest the GC to draw into
+     */
+    private void doubleBufferPaint(GC dest) {
+
+        Point size= fCanvas.getSize();
+
+        if (size.x <= 0 || size.y <= 0)
+            return;
+
+        if (fBuffer !is null) {
+            Rectangle r= fBuffer.getBounds();
+            if (r.width !is size.x || r.height !is size.y) {
+                fBuffer.dispose();
+                fBuffer= null;
+            }
+        }
+        if (fBuffer is null)
+            fBuffer= new Image(fCanvas.getDisplay(), size.x, size.y);
+
+        GC gc= new GC(fBuffer);
+        gc.setFont(fCachedTextWidget.getFont());
+        try {
+            gc.setBackground(fCanvas.getBackground());
+            gc.fillRectangle(0, 0, size.x, size.y);
+
+            if (fCachedTextViewer instanceof ITextViewerExtension5)
+                doPaint1(gc);
+            else
+                doPaint(gc);
+        } finally {
+            gc.dispose();
+        }
+
+        dest.drawImage(fBuffer, 0, 0);
+    }
+
+    /**
+     * Returns the document offset of the upper left corner of the source viewer's
+     * view port, possibly including partially visible lines.
+     *
+     * @return document offset of the upper left corner including partially visible lines
+     */
+    protected int getInclusiveTopIndexStartOffset() {
+        if (fCachedTextWidget is null || fCachedTextWidget.isDisposed())
+            return -1;
+        
+        IDocument document= fCachedTextViewer.getDocument();
+        if (document is null)
+            return -1;
+        
+        int top= JFaceTextUtil.getPartialTopIndex(fCachedTextViewer);
+        try {
+            return document.getLineOffset(top);
+        } catch (BadLocationException x) {
+            return -1;
+        }
+    }
+
+    /**
+     * Returns the first invisible document offset of the lower right corner of the source viewer's view port,
+     * possibly including partially visible lines.
+     *
+     * @return the first invisible document offset of the lower right corner of the view port
+     */
+    private int getExclusiveBottomIndexEndOffset() {
+        if (fCachedTextWidget is null || fCachedTextWidget.isDisposed())
+            return -1;
+        
+        IDocument document= fCachedTextViewer.getDocument();
+        if (document is null)
+            return -1;
+        
+        int bottom= JFaceTextUtil.getPartialBottomIndex(fCachedTextViewer);
+        try {
+            if (bottom >= document.getNumberOfLines())
+                bottom= document.getNumberOfLines() - 1;
+            return document.getLineOffset(bottom) + document.getLineLength(bottom);
+        } catch (BadLocationException x) {
+            return -1;
+        }
+    }
+
+    /**
+     * Draws the vertical ruler w/o drawing the Canvas background.
+     *
+     * @param gc the GC to draw into
+     */
+    protected void doPaint(GC gc) {
+
+        if (fModel is null || fCachedTextViewer is null)
+            return;
+
+        int topLeft= getInclusiveTopIndexStartOffset();
+        // http://dev.eclipse.org/bugs/show_bug.cgi?id=14938
+        // http://dev.eclipse.org/bugs/show_bug.cgi?id=22487
+        // we want the exclusive offset (right after the last character)
+        int bottomRight= getExclusiveBottomIndexEndOffset();
+        int viewPort= bottomRight - topLeft;
+
+        fScrollPos= fCachedTextWidget.getTopPixel();
+        Point dimension= fCanvas.getSize();
+
+        IDocument doc= fCachedTextViewer.getDocument();
+        if (doc is null)
+            return;
+
+        int topLine= -1, bottomLine= -1;
+        try {
+            IRegion region= fCachedTextViewer.getVisibleRegion();
+            topLine= doc.getLineOfOffset(region.getOffset());
+            bottomLine= doc.getLineOfOffset(region.getOffset() + region.getLength());
+        } catch (BadLocationException x) {
+            return;
+        }
+
+        // draw Annotations
+        Rectangle r= new Rectangle(0, 0, 0, 0);
+        int maxLayer= 1;    // loop at least once through layers.
+
+        for (int layer= 0; layer < maxLayer; layer++) {
+            Iterator iter;
+            if (fModel instanceof IAnnotationModelExtension2)
+                iter= ((IAnnotationModelExtension2)fModel).getAnnotationIterator(topLeft, viewPort + 1, true, true);
+            else
+                iter= fModel.getAnnotationIterator();
+
+            while (iter.hasNext()) {
+                Annotation annotation= (Annotation) iter.next();
+
+                int lay= IAnnotationAccessExtension.DEFAULT_LAYER;
+                if (fAnnotationAccessExtension !is null)
+                    lay= fAnnotationAccessExtension.getLayer(annotation);
+                maxLayer= Math.max(maxLayer, lay+1);    // dynamically update layer maximum
+                if (lay !is layer)   // wrong layer: skip annotation
+                    continue;
+
+                if (skip(annotation))
+                    continue;
+
+                Position position= fModel.getPosition(annotation);
+                if (position is null)
+                    continue;
+
+                // https://bugs.eclipse.org/bugs/show_bug.cgi?id=20284
+                // Position.overlapsWith returns false if the position just starts at the end
+                // of the specified range. If the position has zero length, we want to include it anyhow
+                int viewPortSize= position.getLength() is 0 ? viewPort + 1 : viewPort;
+                if (!position.overlapsWith(topLeft, viewPortSize))
+                    continue;
+
+                try {
+
+                    int offset= position.getOffset();
+                    int length= position.getLength();
+
+                    int startLine= doc.getLineOfOffset(offset);
+                    if (startLine < topLine)
+                        startLine= topLine;
+
+                    int endLine= startLine;
+                    if (length > 0)
+                        endLine= doc.getLineOfOffset(offset + length - 1);
+                    if (endLine > bottomLine)
+                        endLine= bottomLine;
+
+                    startLine -= topLine;
+                    endLine -= topLine;
+
+                    r.x= 0;
+                    r.y= JFaceTextUtil.computeLineHeight(fCachedTextWidget, 0, startLine, startLine)  - fScrollPos;
+                    
+                    r.width= dimension.x;
+                    int lines= endLine - startLine;
+                    
+                    r.height= JFaceTextUtil.computeLineHeight(fCachedTextWidget, startLine, endLine + 1, lines + 1);
+
+                    if (r.y < dimension.y && fAnnotationAccessExtension !is null)  // annotation within visible area
+                        fAnnotationAccessExtension.paint(annotation, gc, fCanvas, r);
+
+                } catch (BadLocationException x) {
+                }
+            }
+        }
+    }
+
+    /**
+     * Draws the vertical ruler w/o drawing the Canvas background. Implementation based
+     * on <code>ITextViewerExtension5</code>. Will replace <code>doPaint(GC)</code>.
+     *
+     * @param gc the GC to draw into
+     */
+    protected void doPaint1(GC gc) {
+
+        if (fModel is null || fCachedTextViewer is null)
+            return;
+
+        ITextViewerExtension5 extension= (ITextViewerExtension5) fCachedTextViewer;
+
+        fScrollPos= fCachedTextWidget.getTopPixel();
+        Point dimension= fCanvas.getSize();
+
+        int vOffset= getInclusiveTopIndexStartOffset();
+        int vLength= getExclusiveBottomIndexEndOffset() - vOffset;
+
+        // draw Annotations
+        Rectangle r= new Rectangle(0, 0, 0, 0);
+        ReusableRegion range= new ReusableRegion();
+
+        int minLayer= Integer.MAX_VALUE, maxLayer= Integer.MIN_VALUE;
+        fCachedAnnotations.clear();
+        Iterator iter;
+        if (fModel instanceof IAnnotationModelExtension2)
+            iter= ((IAnnotationModelExtension2)fModel).getAnnotationIterator(vOffset, vLength + 1, true, true);
+        else
+            iter= fModel.getAnnotationIterator();
+
+        while (iter.hasNext()) {
+            Annotation annotation= (Annotation) iter.next();
+
+            if (skip(annotation))
+                continue;
+
+            Position position= fModel.getPosition(annotation);
+            if (position is null)
+                continue;
+
+            // https://bugs.eclipse.org/bugs/show_bug.cgi?id=217710
+            int extendedVLength= position.getLength() is 0 ? vLength + 1 : vLength;
+            if (!position.overlapsWith(vOffset, extendedVLength))
+                continue;
+
+            int lay= IAnnotationAccessExtension.DEFAULT_LAYER;
+            if (fAnnotationAccessExtension !is null)
+                lay= fAnnotationAccessExtension.getLayer(annotation);
+
+            minLayer= Math.min(minLayer, lay);
+            maxLayer= Math.max(maxLayer, lay);
+            fCachedAnnotations.add(new Tuple(annotation, position));
+        }
+        Collections.sort(fCachedAnnotations, fTupleComparator);
+
+        for (int layer= minLayer; layer <= maxLayer; layer++) {
+            for (int i= 0, n= fCachedAnnotations.size(); i < n; i++) {
+                Tuple tuple= (Tuple) fCachedAnnotations.get(i);
+                Annotation annotation= tuple.annotation;
+                Position position= tuple.position;
+
+                int lay= IAnnotationAccessExtension.DEFAULT_LAYER;
+                if (fAnnotationAccessExtension !is null)
+                    lay= fAnnotationAccessExtension.getLayer(annotation);
+                if (lay !is layer)   // wrong layer: skip annotation
+                    continue;
+
+                range.setOffset(position.getOffset());
+                range.setLength(position.getLength());
+                IRegion widgetRegion= extension.modelRange2WidgetRange(range);
+                if (widgetRegion is null)
+                    continue;
+
+                int startLine= extension.widgetLineOfWidgetOffset(widgetRegion.getOffset());
+                if (startLine is -1)
+                    continue;
+
+                int endLine= extension.widgetLineOfWidgetOffset(widgetRegion.getOffset() + Math.max(widgetRegion.getLength() -1, 0));
+                if (endLine is -1)
+                    continue;
+
+                r.x= 0;
+                r.y= JFaceTextUtil.computeLineHeight(fCachedTextWidget, 0, startLine, startLine)  - fScrollPos;
+                
+                r.width= dimension.x;
+                int lines= endLine - startLine;
+                r.height= JFaceTextUtil.computeLineHeight(fCachedTextWidget, startLine, endLine + 1, lines + 1);
+
+                if (r.y < dimension.y && fAnnotationAccessExtension !is null)  // annotation within visible area
+                    fAnnotationAccessExtension.paint(annotation, gc, fCanvas, r);
+            }
+        }
+
+        fCachedAnnotations.clear();
+    }
+
+
+    /**
+     * Post a redraw request for this column into the UI thread.
+     */
+    private void postRedraw() {
+        if (fCanvas !is null && !fCanvas.isDisposed()) {
+            Display d= fCanvas.getDisplay();
+            if (d !is null) {
+                d.asyncExec(new Runnable() {
+                    public void run() {
+                        redraw();
+                    }
+                });
+            }
+        }
+    }
+
+    /*
+     * @see IVerticalRulerColumn#redraw()
+     */
+    public void redraw() {
+        if (fCanvas !is null && !fCanvas.isDisposed()) {
+            GC gc= new GC(fCanvas);
+            doubleBufferPaint(gc);
+            gc.dispose();
+        }
+    }
+
+    /*
+     * @see IVerticalRulerColumn#setModel
+     */
+    public void setModel(IAnnotationModel model) {
+        if (fAllowSetModel && model !is fModel) {
+
+            if (fModel !is null)
+                fModel.removeAnnotationModelListener(fInternalListener);
+
+            fModel= model;
+
+            if (fModel !is null)
+                fModel.addAnnotationModelListener(fInternalListener);
+
+            postRedraw();
+        }
+    }
+
+    /*
+     * @see IVerticalRulerColumn#setFont(Font)
+     */
+    public void setFont(Font font) {
+    }
+
+    /**
+     * Returns the cached text viewer.
+     *
+     * @return the cached text viewer
+     */
+    protected ITextViewer getCachedTextViewer() {
+        return fCachedTextViewer;
+    }
+
+    /*
+     * @see dwtx.jface.text.source.IVerticalRulerInfoExtension#getModel()
+     */
+    public IAnnotationModel getModel() {
+        return fModel;
+    }
+
+    /**
+     * Adds the given annotation type to this annotation ruler column. Starting
+     * with this call, annotations of the given type are shown in this annotation
+     * ruler column.
+     *
+     * @param annotationType the annotation type
+     * @since 3.0
+     */
+    public void addAnnotationType(Object annotationType) {
+        fConfiguredAnnotationTypes.add(annotationType);
+        fAllowedAnnotationTypes.clear();
+    }
+
+    /*
+     * @see dwtx.jface.text.source.IVerticalRulerInfo#getLineOfLastMouseButtonActivity()
+     * @since 3.0
+     */
+    public int getLineOfLastMouseButtonActivity() {
+        return fParentRuler.getLineOfLastMouseButtonActivity();
+    }
+
+    /*
+     * @see dwtx.jface.text.source.IVerticalRulerInfo#toDocumentLineNumber(int)
+     * @since 3.0
+     */
+    public int toDocumentLineNumber(int y_coordinate) {
+        return fParentRuler.toDocumentLineNumber(y_coordinate);
+    }
+    
+    /**
+     * Removes the given annotation type from this annotation ruler column.
+     * Annotations of the given type are no longer shown in this annotation
+     * ruler column.
+     *
+     * @param annotationType the annotation type
+     * @since 3.0
+     */
+    public void removeAnnotationType(Object annotationType) {
+        fConfiguredAnnotationTypes.remove(annotationType);
+        fAllowedAnnotationTypes.clear();
+    }
+
+    /**
+     * Returns whether the given annotation should be skipped by the drawing
+     * routine.
+     *
+     * @param annotation the annotation
+     * @return <code>true</code> if annotation of the given type should be
+     *         skipped, <code>false</code> otherwise
+     * @since 3.0
+     */
+    private bool skip(Annotation annotation) {
+        Object annotationType= annotation.getType();
+        Boolean allowed= (Boolean) fAllowedAnnotationTypes.get(annotationType);
+        if (allowed !is null)
+            return !allowed.booleanValue();
+
+        bool skip= skip(annotationType);
+        fAllowedAnnotationTypes.put(annotationType, !skip ? Boolean.TRUE : Boolean.FALSE);
+        return skip;
+    }
+
+    /**
+     * Computes whether the annotation of the given type should be skipped or
+     * not.
+     *
+     * @param annotationType the annotation type
+     * @return <code>true</code> if annotation should be skipped, <code>false</code>
+     *         otherwise
+     * @since 3.0
+     */
+    private bool skip(Object annotationType) {
+        if (fAnnotationAccessExtension !is null) {
+            Iterator e= fConfiguredAnnotationTypes.iterator();
+            while (e.hasNext()) {
+                if (fAnnotationAccessExtension.isSubtype(annotationType, e.next()))
+                    return false;
+            }
+            return true;
+        }
+        return !fConfiguredAnnotationTypes.contains(annotationType);
+    }
+
+    /*
+     * @see dwtx.jface.text.source.IVerticalRulerInfoExtension#getHover()
+     * @since 3.0
+     */
+    public IAnnotationHover getHover() {
+        return fHover;
+    }
+
+    /**
+     * @param hover The hover to set.
+     * @since 3.0
+     */
+    public void setHover(IAnnotationHover hover) {
+        fHover= hover;
+    }
+
+    /*
+     * @see dwtx.jface.text.source.IVerticalRulerInfoExtension#addVerticalRulerListener(dwtx.jface.text.source.IVerticalRulerListener)
+     * @since 3.0
+     */
+    public void addVerticalRulerListener(IVerticalRulerListener listener) {
+        throw new UnsupportedOperationException();
+    }
+
+    /*
+     * @see dwtx.jface.text.source.IVerticalRulerInfoExtension#removeVerticalRulerListener(dwtx.jface.text.source.IVerticalRulerListener)
+     * @since 3.0
+     */
+    public void removeVerticalRulerListener(IVerticalRulerListener listener) {
+        throw new UnsupportedOperationException();
+    }
+}