--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/AnnotationBarHoverManager.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,859 @@
+/*******************************************************************************
+ * 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.jface.text.source.AnnotationBarHoverManager;
+
+import org.eclipse.jface.text.source.ISharedTextColors; // packageimport
+import org.eclipse.jface.text.source.ILineRange; // packageimport
+import org.eclipse.jface.text.source.IAnnotationPresentation; // packageimport
+import org.eclipse.jface.text.source.IVerticalRulerInfoExtension; // packageimport
+import org.eclipse.jface.text.source.ICharacterPairMatcher; // packageimport
+import org.eclipse.jface.text.source.TextInvocationContext; // packageimport
+import org.eclipse.jface.text.source.LineChangeHover; // packageimport
+import org.eclipse.jface.text.source.IChangeRulerColumn; // packageimport
+import org.eclipse.jface.text.source.IAnnotationMap; // packageimport
+import org.eclipse.jface.text.source.IAnnotationModelListenerExtension; // packageimport
+import org.eclipse.jface.text.source.ISourceViewerExtension2; // packageimport
+import org.eclipse.jface.text.source.IAnnotationHover; // packageimport
+import org.eclipse.jface.text.source.ContentAssistantFacade; // packageimport
+import org.eclipse.jface.text.source.IAnnotationAccess; // packageimport
+import org.eclipse.jface.text.source.IVerticalRulerExtension; // packageimport
+import org.eclipse.jface.text.source.IVerticalRulerColumn; // packageimport
+import org.eclipse.jface.text.source.LineNumberRulerColumn; // packageimport
+import org.eclipse.jface.text.source.MatchingCharacterPainter; // packageimport
+import org.eclipse.jface.text.source.IAnnotationModelExtension; // packageimport
+import org.eclipse.jface.text.source.ILineDifferExtension; // packageimport
+import org.eclipse.jface.text.source.DefaultCharacterPairMatcher; // packageimport
+import org.eclipse.jface.text.source.LineNumberChangeRulerColumn; // packageimport
+import org.eclipse.jface.text.source.IAnnotationAccessExtension; // packageimport
+import org.eclipse.jface.text.source.ISourceViewer; // packageimport
+import org.eclipse.jface.text.source.AnnotationModel; // packageimport
+import org.eclipse.jface.text.source.ILineDifferExtension2; // packageimport
+import org.eclipse.jface.text.source.IAnnotationModelListener; // packageimport
+import org.eclipse.jface.text.source.IVerticalRuler; // packageimport
+import org.eclipse.jface.text.source.DefaultAnnotationHover; // packageimport
+import org.eclipse.jface.text.source.SourceViewer; // packageimport
+import org.eclipse.jface.text.source.SourceViewerConfiguration; // packageimport
+import org.eclipse.jface.text.source.CompositeRuler; // packageimport
+import org.eclipse.jface.text.source.ImageUtilities; // packageimport
+import org.eclipse.jface.text.source.VisualAnnotationModel; // packageimport
+import org.eclipse.jface.text.source.IAnnotationModel; // packageimport
+import org.eclipse.jface.text.source.ISourceViewerExtension3; // packageimport
+import org.eclipse.jface.text.source.ILineDiffInfo; // packageimport
+import org.eclipse.jface.text.source.VerticalRulerEvent; // packageimport
+import org.eclipse.jface.text.source.ChangeRulerColumn; // packageimport
+import org.eclipse.jface.text.source.ILineDiffer; // packageimport
+import org.eclipse.jface.text.source.AnnotationModelEvent; // packageimport
+import org.eclipse.jface.text.source.AnnotationColumn; // packageimport
+import org.eclipse.jface.text.source.AnnotationRulerColumn; // packageimport
+import org.eclipse.jface.text.source.IAnnotationHoverExtension; // packageimport
+import org.eclipse.jface.text.source.AbstractRulerColumn; // packageimport
+import org.eclipse.jface.text.source.ISourceViewerExtension; // packageimport
+import org.eclipse.jface.text.source.AnnotationMap; // packageimport
+import org.eclipse.jface.text.source.IVerticalRulerInfo; // packageimport
+import org.eclipse.jface.text.source.IAnnotationModelExtension2; // packageimport
+import org.eclipse.jface.text.source.LineRange; // packageimport
+import org.eclipse.jface.text.source.IAnnotationAccessExtension2; // packageimport
+import org.eclipse.jface.text.source.VerticalRuler; // packageimport
+import org.eclipse.jface.text.source.JFaceTextMessages; // packageimport
+import org.eclipse.jface.text.source.IOverviewRuler; // packageimport
+import org.eclipse.jface.text.source.Annotation; // packageimport
+import org.eclipse.jface.text.source.IVerticalRulerListener; // packageimport
+import org.eclipse.jface.text.source.ISourceViewerExtension4; // packageimport
+import org.eclipse.jface.text.source.AnnotationPainter; // packageimport
+import org.eclipse.jface.text.source.IAnnotationHoverExtension2; // packageimport
+import org.eclipse.jface.text.source.OverviewRuler; // packageimport
+import org.eclipse.jface.text.source.OverviewRulerHoverManager; // packageimport
+
+import java.lang.all;
+import java.util.Iterator;
+import java.util.Set;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.custom.StyledText;
+import org.eclipse.swt.events.ControlEvent;
+import org.eclipse.swt.events.ControlListener;
+import org.eclipse.swt.events.DisposeEvent;
+import org.eclipse.swt.events.DisposeListener;
+import org.eclipse.swt.events.KeyEvent;
+import org.eclipse.swt.events.KeyListener;
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.events.MouseListener;
+import org.eclipse.swt.events.MouseMoveListener;
+import org.eclipse.swt.events.MouseTrackAdapter;
+import org.eclipse.swt.events.ShellEvent;
+import org.eclipse.swt.events.ShellListener;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Event;
+import org.eclipse.swt.widgets.Listener;
+import org.eclipse.core.runtime.Assert;
+import org.eclipse.jface.internal.text.InformationControlReplacer;
+import org.eclipse.jface.internal.text.InternalAccessor;
+import org.eclipse.jface.text.AbstractHoverInformationControlManager;
+import org.eclipse.jface.text.AbstractInformationControlManager;
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IInformationControl;
+import org.eclipse.jface.text.IInformationControlCreator;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.ITextViewerExtension5;
+import org.eclipse.jface.text.JFaceTextUtil;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.TextUtilities;
+import org.eclipse.jface.text.ITextViewerExtension8;
+
+
+/**
+ * This manager controls the layout, content, and visibility of an information
+ * control in reaction to mouse hover events issued by the vertical ruler of a
+ * source viewer.
+ * @since 2.0
+ */
+public class AnnotationBarHoverManager : AbstractHoverInformationControlManager {
+
+    /**
+     * The information control closer for the hover information. Closes the information control as soon as the mouse pointer leaves the subject area, a mouse button is pressed, the user presses a key, or the subject control is resized or moved.
+     *
+     * @since 3.0
+     * @deprecated As of 3.4, no longer used as closer from super class is used
+     */
+    protected class Closer : MouseTrackAdapter , IInformationControlCloser, MouseListener, MouseMoveListener, ControlListener, KeyListener, DisposeListener, ShellListener, Listener {
+
+        /** The closer's subject control */
+        private Control fSubjectControl;
+        /** The subject area */
+        private Rectangle fSubjectArea;
+        /** Indicates whether this closer is active */
+        private bool fIsActive= false;
+        /** The information control. */
+        private IInformationControl fInformationControlToClose;
+        /**
+         * <code>true</code> if a wheel handler is installed.
+         * @since 3.2
+         */
+        private bool fHasWheelFilter= false;
+        /**
+         * The cached display.
+         * @since 3.2
+         */
+        private Display fDisplay;
+
+
+        /**
+         * Creates a new information control closer.
+         */
+        public this() {
+        }
+
+        /*
+         * @see IInformationControlCloser#setSubjectControl(Control)
+         */
+        public void setSubjectControl(Control control) {
+            fSubjectControl= control;
+        }
+
+        /*
+         * @see IInformationControlCloser#setHoverControl(IHoverControl)
+         */
+        public void setInformationControl(IInformationControl control) {
+            fInformationControlToClose= control;
+        }
+
+        /*
+         * @see IInformationControlCloser#start(Rectangle)
+         */
+        public void start(Rectangle subjectArea) {
+
+            if (fIsActive) return;
+            fIsActive= true;
+
+            fSubjectArea= subjectArea;
+
+            fInformationControlToClose.addDisposeListener(this);
+            if (fSubjectControl !is null && !fSubjectControl.isDisposed()) {
+                fSubjectControl.addMouseListener(this);
+                fSubjectControl.addMouseMoveListener(this);
+                fSubjectControl.addMouseTrackListener(this);
+                fSubjectControl.getShell().addShellListener(this);
+                fSubjectControl.addControlListener(this);
+                fSubjectControl.addKeyListener(this);
+
+                fDisplay= fSubjectControl.getDisplay();
+                if (!fDisplay.isDisposed() && fHideOnMouseWheel) {
+                    fHasWheelFilter= true;
+                    fDisplay.addFilter(SWT.MouseWheel, this);
+                }
+            }
+        }
+
+        /*
+         * @see IInformationControlCloser#stop()
+         */
+        public void stop() {
+
+            if (!fIsActive)
+                return;
+            fIsActive= false;
+
+            if (fSubjectControl !is null && !fSubjectControl.isDisposed()) {
+                fSubjectControl.removeMouseListener(this);
+                fSubjectControl.removeMouseMoveListener(this);
+                fSubjectControl.removeMouseTrackListener(this);
+                fSubjectControl.getShell().removeShellListener(this);
+                fSubjectControl.removeControlListener(this);
+                fSubjectControl.removeKeyListener(this);
+            }
+
+            if (fDisplay !is null && !fDisplay.isDisposed() && fHasWheelFilter)
+                fDisplay.removeFilter(SWT.MouseWheel, this);
+            fHasWheelFilter= false;
+
+            fDisplay= null;
+
+        }
+
+        /**
+         * Stops the information control and if <code>delayRestart</code> is set allows restart only after a certain delay.
+         *
+         * @param delayRestart <code>true</code> if restart should be delayed
+         * @deprecated As of 3.4, replaced by {@link #stop()}. Note that <code>delayRestart</code> was never honored.
+         */
+        protected void stop(bool delayRestart) {
+            stop();
+        }
+
+        /*
+         * @see org.eclipse.swt.events.MouseMoveListener#mouseMove(org.eclipse.swt.events.MouseEvent)
+         */
+        public void mouseMove(MouseEvent event) {
+            if (!fSubjectArea.contains(event.x, event.y))
+                hideInformationControl();
+        }
+
+        /*
+         * @see org.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.MouseEvent)
+         */
+        public void mouseUp(MouseEvent event) {
+        }
+
+        /*
+         * @see MouseListener#mouseDown(MouseEvent)
+         */
+        public void mouseDown(MouseEvent event) {
+            hideInformationControl();
+        }
+
+        /*
+         * @see MouseListener#mouseDoubleClick(MouseEvent)
+         */
+        public void mouseDoubleClick(MouseEvent event) {
+            hideInformationControl();
+        }
+
+        /*
+         * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
+         * @since 3.2
+         */
+        public void handleEvent(Event event) {
+            if (event.type is SWT.MouseWheel)
+                hideInformationControl();
+        }
+
+        /*
+         * @see MouseTrackAdapter#mouseExit(MouseEvent)
+         */
+        public void mouseExit(MouseEvent event) {
+            if (!fAllowMouseExit)
+                hideInformationControl();
+        }
+
+        /*
+         * @see ControlListener#controlResized(ControlEvent)
+         */
+        public void controlResized(ControlEvent event) {
+            hideInformationControl();
+        }
+
+        /*
+         * @see ControlListener#controlMoved(ControlEvent)
+         */
+        public void controlMoved(ControlEvent event) {
+            hideInformationControl();
+        }
+
+        /*
+         * @see KeyListener#keyReleased(KeyEvent)
+         */
+        public void keyReleased(KeyEvent event) {
+        }
+
+        /*
+         * @see KeyListener#keyPressed(KeyEvent)
+         */
+        public void keyPressed(KeyEvent event) {
+            hideInformationControl();
+        }
+
+        /*
+         * @see org.eclipse.swt.events.ShellListener#shellActivated(org.eclipse.swt.events.ShellEvent)
+         * @since 3.1
+         */
+        public void shellActivated(ShellEvent e) {
+        }
+
+        /*
+         * @see org.eclipse.swt.events.ShellListener#shellClosed(org.eclipse.swt.events.ShellEvent)
+         * @since 3.1
+         */
+        public void shellClosed(ShellEvent e) {
+        }
+
+        /*
+         * @see org.eclipse.swt.events.ShellListener#shellDeactivated(org.eclipse.swt.events.ShellEvent)
+         * @since 3.1
+         */
+        public void shellDeactivated(ShellEvent e) {
+            hideInformationControl();
+        }
+
+        /*
+         * @see org.eclipse.swt.events.ShellListener#shellDeiconified(org.eclipse.swt.events.ShellEvent)
+         * @since 3.1
+         */
+        public void shellDeiconified(ShellEvent e) {
+        }
+
+        /*
+         * @see org.eclipse.swt.events.ShellListener#shellIconified(org.eclipse.swt.events.ShellEvent)
+         * @since 3.1
+         */
+        public void shellIconified(ShellEvent e) {
+        }
+
+        /*
+         * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
+         */
+        public void widgetDisposed(DisposeEvent e) {
+            hideInformationControl();
+        }
+    }
+
+    /** The source viewer the manager is connected to */
+    private ISourceViewer fSourceViewer;
+    /** The vertical ruler the manager is registered with */
+    private IVerticalRulerInfo fVerticalRulerInfo;
+    /** The annotation hover the manager uses to retrieve the information to display. Can be <code>null</code>. */
+    private IAnnotationHover fAnnotationHover;
+    /**
+     * Indicates whether the mouse cursor is allowed to leave the subject area without closing the hover.
+     * @since 3.0
+     */
+    protected bool fAllowMouseExit= false;
+    /**
+     * Whether we should hide the over on mouse wheel action.
+     *
+     * @since 3.2
+     */
+    private bool fHideOnMouseWheel= true;
+
+    /**
+     * The current annotation hover.
+     * @since 3.2
+     */
+    private IAnnotationHover fCurrentHover;
+
+    /**
+     * Creates an annotation hover manager with the given parameters. In addition,
+     * the hovers anchor is RIGHT and the margin is 5 points to the right.
+     *
+     * @param sourceViewer the source viewer this manager connects to
+     * @param ruler the vertical ruler this manager connects to
+     * @param annotationHover the annotation hover providing the information to be displayed
+     * @param creator the information control creator
+     * @deprecated As of 2.1, replaced by {@link AnnotationBarHoverManager#AnnotationBarHoverManager(IVerticalRulerInfo, ISourceViewer, IAnnotationHover, IInformationControlCreator)}
+     */
+    public this(ISourceViewer sourceViewer, IVerticalRuler ruler, IAnnotationHover annotationHover, IInformationControlCreator creator) {
+        this(ruler, sourceViewer, annotationHover, creator);
+    }
+
+    /**
+     * Creates an annotation hover manager with the given parameters. In addition,
+     * the hovers anchor is RIGHT and the margin is 5 points to the right.
+     *
+     * @param rulerInfo the vertical ruler this manager connects to
+     * @param sourceViewer the source viewer this manager connects to
+     * @param annotationHover the annotation hover providing the information to be displayed or <code>null</code> if none
+     * @param creator the information control creator
+     * @since 2.1
+     */
+    public this(IVerticalRulerInfo rulerInfo, ISourceViewer sourceViewer, IAnnotationHover annotationHover, IInformationControlCreator creator) {
+        super(creator);
+
+        Assert.isNotNull(cast(Object)sourceViewer);
+
+        fSourceViewer= sourceViewer;
+        fVerticalRulerInfo= rulerInfo;
+        fAnnotationHover= annotationHover;
+
+        setAnchor(ANCHOR_RIGHT);
+        setMargins(5, 0);
+        // use closer from super class
+    }
+
+    /*
+     * @see org.eclipse.jface.text.AbstractInformationControlManager#computeInformation()
+     */
+    protected void computeInformation() {
+        fAllowMouseExit= false;
+        MouseEvent event= getHoverEvent();
+        IAnnotationHover hover= getHover(event);
+        if (hover is null) {
+            setInformation(cast(Object)null, null);
+            return;
+        }
+
+        int line= getHoverLine(event);
+
+        if ( cast(IAnnotationHoverExtension)hover ) {
+            IAnnotationHoverExtension extension= cast(IAnnotationHoverExtension) hover;
+            ILineRange range= extension.getHoverLineRange(fSourceViewer, line);
+            setCustomInformationControlCreator(extension.getHoverControlCreator());
+            range= adaptLineRange(range, line);
+            if (range !is null)
+                setInformation(extension.getHoverInfo(fSourceViewer, range, computeNumberOfVisibleLines()), computeArea(range));
+            else
+                setInformation(cast(Object)null, null);
+
+        } else {
+            setCustomInformationControlCreator(null);
+            setInformation(hover.getHoverInfo(fSourceViewer, line), computeArea(line));
+        }
+
+    }
+
+    /*
+     * @see org.eclipse.jface.text.AbstractInformationControlManager#showInformationControl(org.eclipse.swt.graphics.Rectangle)
+     * @since 3.2
+     */
+    protected void showInformationControl(Rectangle subjectArea) {
+        super.showInformationControl(subjectArea);
+        fCurrentHover= getHover(getHoverEvent());
+    }
+
+    /*
+     * @see org.eclipse.jface.text.AbstractInformationControlManager#hideInformationControl()
+     * @since 3.2
+     */
+    protected void hideInformationControl() {
+        fCurrentHover= null;
+        super.hideInformationControl();
+    }
+
+    /**
+     * Adapts a given line range so that the result is a line range that does
+     * not overlap with any collapsed region and fits into the view port of the
+     * attached viewer.
+     *
+     * @param lineRange the original line range
+     * @param line the anchor line
+     * @return the adapted line range
+     * @since 3.0
+     */
+    private ILineRange adaptLineRange(ILineRange lineRange, int line) {
+        if (lineRange !is null) {
+            lineRange= adaptLineRangeToFolding(lineRange, line);
+            if (lineRange !is null)
+                return adaptLineRangeToViewport(lineRange);
+        }
+        return null;
+    }
+
+    /**
+     * Adapts a given line range so that the result is a line range that does
+     * not overlap with any collapsed region of the attached viewer.
+     *
+     * @param lineRange the original line range
+     * @param line the anchor line
+     * @return the adapted line range
+     * @since 3.0
+     */
+    private ILineRange adaptLineRangeToFolding(ILineRange lineRange, int line) {
+
+        if ( cast(ITextViewerExtension5)fSourceViewer ) {
+            ITextViewerExtension5 extension= cast(ITextViewerExtension5) fSourceViewer;
+
+            try {
+                IRegion region= convertToRegion(lineRange);
+                IRegion[] coverage= extension.getCoveredModelRanges(region);
+                if (coverage !is null && coverage.length > 0) {
+                    IRegion container= findRegionContainingLine(coverage, line);
+                    if (container !is null)
+                        return convertToLineRange(container);
+                }
+
+            } catch (BadLocationException x) {
+            }
+
+            return null;
+        }
+
+        return lineRange;
+    }
+
+    /**
+     * Adapts a given line range so that the result is a line range that fits
+     * into the view port of the attached viewer.
+     *
+     * @param lineRange the original line range
+     * @return the adapted line range
+     * @since 3.0
+     */
+    private ILineRange adaptLineRangeToViewport(ILineRange lineRange) {
+
+        try {
+            StyledText text= fSourceViewer.getTextWidget();
+
+            int topLine= text.getTopIndex();
+            int rangeTopLine= getWidgetLineNumber(lineRange.getStartLine());
+            int topDelta= Math.max(topLine - rangeTopLine, 0);
+
+            Rectangle size= text.getClientArea();
+            Rectangle trim= text.computeTrim(0, 0, 0, 0);
+            int height= size.height - trim.height;
+
+            int lines= JFaceTextUtil.getLineIndex(text, height) - text.getTopIndex();
+
+            int bottomLine= topLine + lines;
+
+            int rangeBottomLine= getWidgetLineNumber(lineRange.getStartLine() + lineRange.getNumberOfLines() - 1);
+            int bottomDelta= Math.max(rangeBottomLine - bottomLine, 0);
+
+            return new LineRange(lineRange.getStartLine() + topDelta, lineRange.getNumberOfLines() - bottomDelta - topDelta);
+
+        } catch (BadLocationException ex) {
+        }
+
+        return null;
+    }
+
+    /**
+     * Converts a line range into a character range.
+     *
+     * @param lineRange the line range
+     * @return the corresponding character range
+     * @throws BadLocationException in case the given line range is invalid
+     */
+    private IRegion convertToRegion(ILineRange lineRange)  {
+        IDocument document= fSourceViewer.getDocument();
+        int startOffset= document.getLineOffset(lineRange.getStartLine());
+        int endLine= lineRange.getStartLine() + Math.max(0, lineRange.getNumberOfLines() - 1);
+        IRegion lineInfo= document.getLineInformation(endLine);
+        int endOffset= lineInfo.getOffset() + lineInfo.getLength();
+        return new Region(startOffset, endOffset - startOffset);
+    }
+
+    /**
+     * Returns the region out of the given set that contains the given line or
+     * <code>null</code>.
+     *
+     * @param regions the set of regions
+     * @param line the line
+     * @return the region of the set that contains the line
+     * @throws BadLocationException in case line is invalid
+     */
+    private IRegion findRegionContainingLine(IRegion[] regions, int line)  {
+        IDocument document= fSourceViewer.getDocument();
+        IRegion lineInfo= document.getLineInformation(line);
+        for (int i= 0; i < regions.length; i++) {
+            if (TextUtilities.overlaps(regions[i], lineInfo))
+                return regions[i];
+        }
+        return null;
+    }
+
+    /**
+     * Converts a given character region into a line range.
+     *
+     * @param region the character region
+     * @return the corresponding line range
+     * @throws BadLocationException in case the given region in invalid
+     */
+    private ILineRange convertToLineRange(IRegion region)  {
+        IDocument document= fSourceViewer.getDocument();
+        int startLine= document.getLineOfOffset(region.getOffset());
+        int endLine= document.getLineOfOffset(region.getOffset() + region.getLength());
+        return new LineRange(startLine, endLine - startLine + 1);
+    }
+
+    /**
+     * Returns the visible area of the vertical ruler covered by the given line
+     * range.
+     *
+     * @param lineRange the line range
+     * @return the visible area
+     */
+    private Rectangle computeArea(ILineRange lineRange) {
+        try {
+            StyledText text= fSourceViewer.getTextWidget();
+            final int startLine= getWidgetLineNumber(lineRange.getStartLine());
+            int y= JFaceTextUtil.computeLineHeight(text, 0, startLine, startLine) - text.getTopPixel();
+            int height= JFaceTextUtil.computeLineHeight(text, startLine, startLine + lineRange.getNumberOfLines(), lineRange.getNumberOfLines());
+            Point size= fVerticalRulerInfo.getControl().getSize();
+            return new Rectangle(0, y, size.x, height);
+        } catch (BadLocationException x) {
+        }
+        return null;
+    }
+
+    /**
+     * Returns the number of the currently visible lines.
+     *
+     * @return the number of the currently visible lines
+     * @deprecated to avoid deprecation warning
+     */
+    private int computeNumberOfVisibleLines() {
+        // Hack to reduce amount of copied code.
+        return LineNumberRulerColumn.getVisibleLinesInViewport(fSourceViewer.getTextWidget());
+    }
+
+    /**
+     * Determines the hover to be used to display information based on the source of the
+     * mouse hover event. If <code>fVerticalRulerInfo</code> is not a composite ruler, the
+     * standard hover is returned.
+     *
+     * @param event the source of the mouse hover event
+     * @return the hover depending on <code>source</code>, or <code>fAnnotationHover</code> if none can be found.
+     * @since 3.0
+     */
+    private IAnnotationHover getHover(MouseEvent event) {
+        if (event is null || event.getSource() is null)
+            return fAnnotationHover;
+
+        if ( cast(CompositeRuler)fVerticalRulerInfo ) {
+            CompositeRuler comp= cast(CompositeRuler) fVerticalRulerInfo;
+            for (Iterator it= comp.getDecoratorIterator(); it.hasNext();) {
+                Object o= it.next();
+                if ( cast(IVerticalRulerInfoExtension)o  && cast(IVerticalRulerInfo)o ) {
+                    if ((cast(IVerticalRulerInfo) o).getControl() is event.getSource()) {
+                        IAnnotationHover hover= (cast(IVerticalRulerInfoExtension) o).getHover();
+                        if (hover !is null)
+                            return hover;
+                    }
+                }
+            }
+        }
+        return fAnnotationHover;
+    }
+
+    /**
+     * Returns the line of interest deduced from the mouse hover event.
+     *
+     * @param event a mouse hover event that triggered hovering
+     * @return the document model line number on which the hover event occurred or <code>-1</code> if there is no event
+     * @since 3.0
+     */
+    private int getHoverLine(MouseEvent event) {
+        return event is null ? -1 : fVerticalRulerInfo.toDocumentLineNumber(event.y);
+    }
+
+    /**
+     * Returns for the widget line number for the given document line number.
+     *
+     * @param line the absolute line number
+     * @return the line number relative to the viewer's visible region
+     * @throws BadLocationException if <code>line</code> is not valid in the viewer's document
+     */
+    private int getWidgetLineNumber(int line)  {
+        if ( cast(ITextViewerExtension5)fSourceViewer ) {
+            ITextViewerExtension5 extension= cast(ITextViewerExtension5) fSourceViewer;
+            return extension.modelLine2WidgetLine(line);
+        }
+
+        IRegion region= fSourceViewer.getVisibleRegion();
+        int firstLine= fSourceViewer.getDocument().getLineOfOffset(region.getOffset());
+        return line - firstLine;
+    }
+
+    /**
+     * Determines graphical area covered by the given line.
+     *
+     * @param line the number of the line in the viewer whose graphical extend in the vertical ruler must be computed
+     * @return the graphical extend of the given line
+     */
+    private Rectangle computeArea(int line) {
+        try {
+            StyledText text= fSourceViewer.getTextWidget();
+            int widgetLine= getWidgetLineNumber(line);
+            int y= JFaceTextUtil.computeLineHeight(text, 0, widgetLine, widgetLine) - text.getTopPixel();
+            Point size= fVerticalRulerInfo.getControl().getSize();
+            return new Rectangle(0, y, size.x, text.getLineHeight(text.getOffsetAtLine(widgetLine)));
+        } catch (IllegalArgumentException ex) {
+        } catch (BadLocationException ex) {
+        }
+        return null;
+    }
+
+    /**
+     * Returns the annotation hover for this hover manager.
+     *
+     * @return the annotation hover for this hover manager or <code>null</code> if none
+     * @since 2.1
+     */
+    protected IAnnotationHover getAnnotationHover() {
+        return fAnnotationHover;
+    }
+
+    /**
+     * Returns the source viewer for this hover manager.
+     *
+     * @return the source viewer for this hover manager
+     * @since 2.1
+     */
+    protected ISourceViewer getSourceViewer() {
+        return fSourceViewer;
+    }
+
+    /**
+     * Returns the vertical ruler info for this hover manager
+     *
+     * @return the vertical ruler info for this hover manager
+     * @since 2.1
+     */
+    protected IVerticalRulerInfo getVerticalRulerInfo() {
+        return fVerticalRulerInfo;
+    }
+
+    /*
+     * @see org.eclipse.jface.text.AbstractInformationControlManager#computeSizeConstraints(org.eclipse.swt.widgets.Control, org.eclipse.swt.graphics.Rectangle, org.eclipse.jface.text.IInformationControl)
+     * @since 3.0
+     */
+    protected Point computeSizeConstraints(Control subjectControl, Rectangle subjectArea, IInformationControl informationControl) {
+
+        Point constraints= super.computeSizeConstraints(subjectControl, subjectArea, informationControl);
+
+        // make as big as text area, if possible
+        StyledText styledText= fSourceViewer.getTextWidget();
+        if (styledText !is null) {
+            Rectangle r= styledText.getClientArea();
+            if (r !is null) {
+                constraints.x= r.width;
+                constraints.y= r.height;
+            }
+        }
+
+        return constraints;
+    }
+
+    /*
+     * @see org.eclipse.jface.text.AbstractInformationControlManager#computeLocation(org.eclipse.swt.graphics.Rectangle, org.eclipse.swt.graphics.Point, org.eclipse.jface.text.AbstractInformationControlManager.Anchor)
+     * @since 3.0
+     */
+    protected Point computeLocation(Rectangle subjectArea, Point controlSize, Anchor anchor) {
+        MouseEvent event= getHoverEvent();
+        IAnnotationHover hover= getHover(event);
+
+        bool allowMouseExit= false;
+        if ( cast(IAnnotationHoverExtension)hover ) {
+            IAnnotationHoverExtension extension= cast(IAnnotationHoverExtension) hover;
+            allowMouseExit= extension.canHandleMouseCursor();
+        }
+        bool hideOnMouseWheel= true;
+        if ( cast(IAnnotationHoverExtension2)hover ) {
+            IAnnotationHoverExtension2 extension= cast(IAnnotationHoverExtension2) hover;
+            hideOnMouseWheel= !extension.canHandleMouseWheel();
+        }
+        fHideOnMouseWheel= hideOnMouseWheel;
+
+        if (allowMouseExit) {
+            fAllowMouseExit= true;
+
+            Control subjectControl= getSubjectControl();
+            // return a location that just overlaps the annotation on the bar
+            if (anchor is AbstractInformationControlManager.ANCHOR_RIGHT)
+                return subjectControl.toDisplay(subjectArea.x - 4, subjectArea.y - 2);
+            else if (anchor is AbstractInformationControlManager.ANCHOR_LEFT)
+                return subjectControl.toDisplay(subjectArea.x + subjectArea.width - controlSize.x + 4, subjectArea.y - 2);
+        }
+
+        fAllowMouseExit= false;
+        return super.computeLocation(subjectArea, controlSize, anchor);
+    }
+
+    /**
+     * Returns the currently shown annotation hover or <code>null</code> if none
+     * hover is shown.
+     *
+     * @return the currently shown annotation hover or <code>null</code>
+     * @since 3.2
+     */
+    public IAnnotationHover getCurrentAnnotationHover() {
+        return fCurrentHover;
+    }
+
+    /**
+     * Returns an adapter that gives access to internal methods.
+     * <p>
+     * <strong>Note:</strong> This method is not intended to be referenced or overridden by clients.
+     * </p>
+     *
+     * @return the replaceable information control accessor
+     * @since 3.4
+     * @noreference This method is not intended to be referenced by clients.
+     * @nooverride This method is not intended to be re-implemented or extended by clients.
+     */
+    public InternalAccessor getInternalAccessor() {
+        return new class()  InternalAccessor {
+            public IInformationControl getCurrentInformationControl() {
+                return this.outer.superGetInternalAccessor().getCurrentInformationControl();
+            }
+
+            public void setInformationControlReplacer(InformationControlReplacer replacer) {
+                this.outer.superGetInternalAccessor().setInformationControlReplacer(replacer);
+            }
+
+            public InformationControlReplacer getInformationControlReplacer() {
+                return this.outer.superGetInternalAccessor().getInformationControlReplacer();
+            }
+
+            public bool canReplace(IInformationControl control) {
+                return this.outer.superGetInternalAccessor().canReplace(control);
+            }
+
+            public bool isReplaceInProgress() {
+                return this.outer.superGetInternalAccessor().isReplaceInProgress();
+            }
+
+            public void replaceInformationControl(bool takeFocus) {
+                this.outer.superGetInternalAccessor().replaceInformationControl(takeFocus);
+            }
+
+            public void cropToClosestMonitor(Rectangle bounds) {
+                this.outer.superGetInternalAccessor().cropToClosestMonitor(bounds);
+            }
+
+            public void setHoverEnrichMode(ITextViewerExtension8_EnrichMode mode) {
+                this.outer.superGetInternalAccessor().setHoverEnrichMode(mode);
+            }
+
+            public bool getAllowMouseExit() {
+                return fAllowMouseExit;
+            }
+        };
+    }
+    private InternalAccessor superGetInternalAccessor() {
+        return super.getInternalAccessor();
+    }
+}
+