/*******************************************************************************
 * 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
 *     Sean Montgomery, sean_montgomery@comcast.net - https://bugs.eclipse.org/bugs/show_bug.cgi?id=45095
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/


module dwtx.jface.text.AbstractInformationControlManager;

import dwtx.jface.text.IDocumentPartitioningListener; // packageimport
import dwtx.jface.text.DefaultTextHover; // packageimport
import dwtx.jface.text.AbstractInformationControl; // packageimport
import dwtx.jface.text.TextUtilities; // packageimport
import dwtx.jface.text.IInformationControlCreatorExtension; // packageimport
import dwtx.jface.text.ITextViewerExtension2; // packageimport
import dwtx.jface.text.IDocumentPartitioner; // packageimport
import dwtx.jface.text.DefaultIndentLineAutoEditStrategy; // packageimport
import dwtx.jface.text.ITextSelection; // packageimport
import dwtx.jface.text.Document; // packageimport
import dwtx.jface.text.FindReplaceDocumentAdapterContentProposalProvider; // packageimport
import dwtx.jface.text.ITextListener; // packageimport
import dwtx.jface.text.BadPartitioningException; // packageimport
import dwtx.jface.text.ITextViewerExtension5; // packageimport
import dwtx.jface.text.IDocumentPartitionerExtension3; // packageimport
import dwtx.jface.text.IUndoManager; // packageimport
import dwtx.jface.text.ITextHoverExtension2; // packageimport
import dwtx.jface.text.IRepairableDocument; // packageimport
import dwtx.jface.text.IRewriteTarget; // packageimport
import dwtx.jface.text.DefaultPositionUpdater; // packageimport
import dwtx.jface.text.RewriteSessionEditProcessor; // packageimport
import dwtx.jface.text.TextViewerHoverManager; // packageimport
import dwtx.jface.text.DocumentRewriteSession; // packageimport
import dwtx.jface.text.TextViewer; // packageimport
import dwtx.jface.text.ITextViewerExtension8; // packageimport
import dwtx.jface.text.RegExMessages; // packageimport
import dwtx.jface.text.IDelayedInputChangeProvider; // packageimport
import dwtx.jface.text.ITextOperationTargetExtension; // packageimport
import dwtx.jface.text.IWidgetTokenOwner; // packageimport
import dwtx.jface.text.IViewportListener; // packageimport
import dwtx.jface.text.GapTextStore; // packageimport
import dwtx.jface.text.MarkSelection; // packageimport
import dwtx.jface.text.IDocumentPartitioningListenerExtension; // packageimport
import dwtx.jface.text.IDocumentAdapterExtension; // packageimport
import dwtx.jface.text.IInformationControlExtension; // packageimport
import dwtx.jface.text.IDocumentPartitioningListenerExtension2; // packageimport
import dwtx.jface.text.DefaultDocumentAdapter; // packageimport
import dwtx.jface.text.ITextViewerExtension3; // packageimport
import dwtx.jface.text.IInformationControlCreator; // packageimport
import dwtx.jface.text.TypedRegion; // packageimport
import dwtx.jface.text.ISynchronizable; // packageimport
import dwtx.jface.text.IMarkRegionTarget; // packageimport
import dwtx.jface.text.TextViewerUndoManager; // packageimport
import dwtx.jface.text.IRegion; // packageimport
import dwtx.jface.text.IInformationControlExtension2; // packageimport
import dwtx.jface.text.IDocumentExtension4; // packageimport
import dwtx.jface.text.IDocumentExtension2; // packageimport
import dwtx.jface.text.IDocumentPartitionerExtension2; // packageimport
import dwtx.jface.text.Assert; // packageimport
import dwtx.jface.text.DefaultInformationControl; // packageimport
import dwtx.jface.text.IWidgetTokenOwnerExtension; // packageimport
import dwtx.jface.text.DocumentClone; // packageimport
import dwtx.jface.text.DefaultUndoManager; // packageimport
import dwtx.jface.text.IFindReplaceTarget; // packageimport
import dwtx.jface.text.IAutoEditStrategy; // packageimport
import dwtx.jface.text.ILineTrackerExtension; // packageimport
import dwtx.jface.text.IUndoManagerExtension; // packageimport
import dwtx.jface.text.TextSelection; // packageimport
import dwtx.jface.text.DefaultAutoIndentStrategy; // packageimport
import dwtx.jface.text.IAutoIndentStrategy; // packageimport
import dwtx.jface.text.IPainter; // packageimport
import dwtx.jface.text.IInformationControl; // packageimport
import dwtx.jface.text.IInformationControlExtension3; // packageimport
import dwtx.jface.text.ITextViewerExtension6; // packageimport
import dwtx.jface.text.IInformationControlExtension4; // packageimport
import dwtx.jface.text.DefaultLineTracker; // packageimport
import dwtx.jface.text.IDocumentInformationMappingExtension; // packageimport
import dwtx.jface.text.IRepairableDocumentExtension; // packageimport
import dwtx.jface.text.ITextHover; // packageimport
import dwtx.jface.text.FindReplaceDocumentAdapter; // packageimport
import dwtx.jface.text.ILineTracker; // packageimport
import dwtx.jface.text.Line; // packageimport
import dwtx.jface.text.ITextViewerExtension; // packageimport
import dwtx.jface.text.IDocumentAdapter; // packageimport
import dwtx.jface.text.TextEvent; // packageimport
import dwtx.jface.text.BadLocationException; // packageimport
import dwtx.jface.text.AbstractDocument; // packageimport
import dwtx.jface.text.AbstractLineTracker; // packageimport
import dwtx.jface.text.TreeLineTracker; // packageimport
import dwtx.jface.text.ITextPresentationListener; // packageimport
import dwtx.jface.text.Region; // packageimport
import dwtx.jface.text.ITextViewer; // packageimport
import dwtx.jface.text.IDocumentInformationMapping; // packageimport
import dwtx.jface.text.MarginPainter; // packageimport
import dwtx.jface.text.IPaintPositionManager; // packageimport
import dwtx.jface.text.TextPresentation; // packageimport
import dwtx.jface.text.IFindReplaceTargetExtension; // packageimport
import dwtx.jface.text.ISlaveDocumentManagerExtension; // packageimport
import dwtx.jface.text.ISelectionValidator; // packageimport
import dwtx.jface.text.IDocumentExtension; // packageimport
import dwtx.jface.text.PropagatingFontFieldEditor; // packageimport
import dwtx.jface.text.ConfigurableLineTracker; // packageimport
import dwtx.jface.text.SlaveDocumentEvent; // packageimport
import dwtx.jface.text.IDocumentListener; // packageimport
import dwtx.jface.text.PaintManager; // packageimport
import dwtx.jface.text.IFindReplaceTargetExtension3; // packageimport
import dwtx.jface.text.ITextDoubleClickStrategy; // packageimport
import dwtx.jface.text.IDocumentExtension3; // packageimport
import dwtx.jface.text.Position; // packageimport
import dwtx.jface.text.TextMessages; // packageimport
import dwtx.jface.text.CopyOnWriteTextStore; // packageimport
import dwtx.jface.text.WhitespaceCharacterPainter; // packageimport
import dwtx.jface.text.IPositionUpdater; // packageimport
import dwtx.jface.text.DefaultTextDoubleClickStrategy; // packageimport
import dwtx.jface.text.ListLineTracker; // packageimport
import dwtx.jface.text.ITextInputListener; // packageimport
import dwtx.jface.text.BadPositionCategoryException; // packageimport
import dwtx.jface.text.IWidgetTokenKeeperExtension; // packageimport
import dwtx.jface.text.IInputChangedListener; // packageimport
import dwtx.jface.text.ITextOperationTarget; // packageimport
import dwtx.jface.text.IDocumentInformationMappingExtension2; // packageimport
import dwtx.jface.text.ITextViewerExtension7; // packageimport
import dwtx.jface.text.IInformationControlExtension5; // packageimport
import dwtx.jface.text.IDocumentRewriteSessionListener; // packageimport
import dwtx.jface.text.JFaceTextUtil; // packageimport
import dwtx.jface.text.AbstractReusableInformationControlCreator; // packageimport
import dwtx.jface.text.TabsToSpacesConverter; // packageimport
import dwtx.jface.text.CursorLinePainter; // packageimport
import dwtx.jface.text.ITextHoverExtension; // packageimport
import dwtx.jface.text.IEventConsumer; // packageimport
import dwtx.jface.text.IDocument; // packageimport
import dwtx.jface.text.IWidgetTokenKeeper; // packageimport
import dwtx.jface.text.DocumentCommand; // packageimport
import dwtx.jface.text.TypedPosition; // packageimport
import dwtx.jface.text.IEditingSupportRegistry; // packageimport
import dwtx.jface.text.IDocumentPartitionerExtension; // packageimport
import dwtx.jface.text.AbstractHoverInformationControlManager; // packageimport
import dwtx.jface.text.IEditingSupport; // packageimport
import dwtx.jface.text.IMarkSelection; // packageimport
import dwtx.jface.text.ISlaveDocumentManager; // packageimport
import dwtx.jface.text.DocumentEvent; // packageimport
import dwtx.jface.text.DocumentPartitioningChangedEvent; // packageimport
import dwtx.jface.text.ITextStore; // packageimport
import dwtx.jface.text.JFaceTextMessages; // packageimport
import dwtx.jface.text.DocumentRewriteSessionEvent; // packageimport
import dwtx.jface.text.SequentialRewriteTextStore; // packageimport
import dwtx.jface.text.DocumentRewriteSessionType; // packageimport
import dwtx.jface.text.TextAttribute; // packageimport
import dwtx.jface.text.ITextViewerExtension4; // packageimport
import dwtx.jface.text.ITypedRegion; // packageimport

import dwt.dwthelper.utils;





import dwt.DWT;
import dwt.events.DisposeEvent;
import dwt.events.DisposeListener;
import dwt.graphics.GC;
import dwt.graphics.Point;
import dwt.graphics.Rectangle;
import dwt.widgets.Control;
import dwt.widgets.Display;
import dwt.widgets.Monitor;
import dwtx.core.runtime.Assert;
import dwtx.core.runtime.Platform;
import dwtx.jface.dialogs.IDialogSettings;
import dwtx.jface.internal.text.InformationControlReplacer;
import dwtx.jface.internal.text.InternalAccessor;
import dwtx.jface.text.ITextViewerExtension8.EnrichMode;
import dwtx.jface.util.Geometry;


/**
 * Manages the life cycle, visibility, layout, and contents of an
 * {@link dwtx.jface.text.IInformationControl}. This manager can be
 * installed on and removed from a control, referred to as the subject control,
 * i.e. the one from which the subject of the information to be shown is
 * retrieved. Also a manager can be enabled or disabled. An installed and
 * enabled manager can be forced to show information in its information control
 * using <code>showInformation</code>. An information control manager uses an
 * <code>IInformationControlCloser</code> to define the behavior when a
 * presented information control must be closed. The disposal of the subject and
 * the information control are internally handled by the information control
 * manager and are not the responsibility of the information control closer.
 *
 * @see dwtx.jface.text.IInformationControl
 * @since 2.0
 */
abstract public class AbstractInformationControlManager {

    /**
     * An internal class that gives access to internal methods.
     *
     * @since 3.4
     */
    class MyInternalAccessor : InternalAccessor {
        public IInformationControl getCurrentInformationControl() {
            return this.outer.getCurrentInformationControl();
        }

        public void setInformationControlReplacer(InformationControlReplacer replacer) {
            this.outer.setInformationControlReplacer(replacer);
        }

        public InformationControlReplacer getInformationControlReplacer() {
            return this.outer.getInformationControlReplacer();
        }

        public bool canReplace(IInformationControl control) {
            return this.outer.canReplace(control);
        }

        public bool isReplaceInProgress() {
            return this.outer.isReplaceInProgress();
        }

        public void replaceInformationControl(bool takeFocus) {
            this.outer.replaceInformationControl(takeFocus);
        }

        public void cropToClosestMonitor(Rectangle bounds) {
            this.outer.cropToClosestMonitor(bounds);
        }

        public void setHoverEnrichMode(EnrichMode mode) {
            throw new UnsupportedOperationException("only implemented in AbstractHoverInformationControlManager"); //$NON-NLS-1$
        }

        public bool getAllowMouseExit() {
            throw new UnsupportedOperationException("only implemented in AnnotationBarHoverManager"); //$NON-NLS-1$
        }
    }

    /**
     * Interface of an information control closer. An information control closer
     * monitors its information control and its subject control and closes the
     * information control if necessary.
     * <p>
     * Clients must implement this interface in order to equip an information
     * control manager accordingly.
     */
    public interface IInformationControlCloser {

        /**
         * Sets the closer's subject control. This is the control that parents
         * the information control and from which the subject of the information
         * to be shown is retrieved. <p>
         * Must be called before <code>start</code>. May again be called
         * between <code>start</code> and <code>stop</code>.
         *
         * @param subject the subject control
         */
        public void setSubjectControl(Control subject);

        /**
         * Sets the closer's information control, the one to close if necessary. <p>
         * Must be called before <code>start</code>. May again be called
         * between <code>start</code> and <code>stop</code>.
         *
         * @param control the information control
         */
        public void setInformationControl(IInformationControl control);

        /**
         * Tells this closer to start monitoring the subject and the information
         * control. The presented information is considered valid for the given
         * area of the subject control's display.
         *
         * @param subjectArea the area for which the presented information is valid
         */
        public void start(Rectangle subjectArea);

        /**
         * Tells this closer to stop monitoring the subject and the information control.
         */
        public void stop();
    }



    /**
     * Constitutes entities to enumerate anchors for the layout of the information control.
     */
    public static final class Anchor {
        private const int fFlag;
        private this(int flag) {
            fFlag= flag;
        }
        /**
         * Returns the DWT direction flag. One of {@link DWT#BOTTOM}, {@link DWT#TOP},
         * {@link DWT#LEFT}, {@link DWT#RIGHT}, {@link DWT#CENTER},
         *
         * @return the DWT direction flag
         * @since 3.3
         */
        int getSWTFlag() {
            return fFlag;
        }

        public String toString() {
            switch (fFlag) {
                case DWT.BOTTOM: return "BOTTOM"; //$NON-NLS-1$
                case DWT.TOP: return "TOP"; //$NON-NLS-1$
                case DWT.LEFT: return "LEFT"; //$NON-NLS-1$
                case DWT.RIGHT: return "RIGHT"; //$NON-NLS-1$
                case DWT.CENTER: return "CENTER"; //$NON-NLS-1$
                default: return Integer.toHexString(fFlag);
            }
        }
    }

    /** Internal anchor list. */
    private const static Anchor[] ANCHORS= { new Anchor(DWT.TOP), new Anchor(DWT.BOTTOM), new Anchor(DWT.LEFT), new Anchor(DWT.RIGHT) };

    /** Anchor representing the top of the information area */
    public const static Anchor ANCHOR_TOP=  ANCHORS[0];
    /** Anchor representing the bottom of the information area */
    public const static Anchor ANCHOR_BOTTOM=  ANCHORS[1];
    /** Anchor representing the left side of the information area */
    public const static Anchor ANCHOR_LEFT=  ANCHORS[2];
    /** Anchor representing the right side of the information area */
    public const static Anchor ANCHOR_RIGHT= ANCHORS[3];
    /**
     * Anchor representing the middle of the subject control
     * @since 2.1
     */
    public const static Anchor ANCHOR_GLOBAL= new Anchor(DWT.CENTER);

    /**
     * Dialog store constant for the location's x-coordinate.
     * @since 3.0
     */
    public static const String STORE_LOCATION_X= "location.x"; //$NON-NLS-1$
    /**
     * Dialog store constant for the location's y-coordinate.
     * @since 3.0
     */
    public static const String STORE_LOCATION_Y= "location.y"; //$NON-NLS-1$
    /**
     * Dialog store constant for the size's width.
     * @since 3.0
     */
    public static const String STORE_SIZE_WIDTH= "size.width"; //$NON-NLS-1$
    /**
     * Dialog store constant for the size's height.
     * @since 3.0
     */
    public static const String STORE_SIZE_HEIGHT= "size.height"; //$NON-NLS-1$

    /**
     * Tells whether this class and its subclasses are in debug mode.
     * <p>
     * Subclasses may use this.
     * </p>
     * @since 3.4
     */
    protected static final bool DEBUG= "true".equalsIgnoreCase(Platform.getDebugOption("dwtx.jface.text/debug/AbstractInformationControlManager"));  //$NON-NLS-1$//$NON-NLS-2$


    /** The subject control of the information control */
    private Control  fSubjectControl;

    /** The display area for which the information to be presented is valid */
    private Rectangle fSubjectArea;

    /** The information to be presented */
    private Object fInformation;

    /** Indicates whether the information control takes focus when visible */
    private bool fTakesFocusWhenVisible= false;

    /**
     * The information control.
     *
     * <p>This field should not be referenced by subclasses. It is <code>protected</code> for API
     * compatibility reasons.
     */
    protected IInformationControl fInformationControl;

    /**
     * The information control creator.
     *
     * <p>This field should not be referenced by subclasses. It is <code>protected</code> for API
     * compatibility reasons.
     */
    protected IInformationControlCreator fInformationControlCreator;

    /**
     * The information control closer.
     *
     * <p>This field should not be referenced by subclasses. It is <code>protected</code> for API
     * compatibility reasons.
     */
    protected IInformationControlCloser fInformationControlCloser;

    /**
     * Indicates that the information control has been disposed.
     *
     * <p>This field should not be referenced by subclasses. It is <code>protected</code> for API
     * compatibility reasons.
     */
    protected bool fDisposed= false;

    /**
     * The information control replacer to be used when this information control
     * needs to be replaced with another information control.
     *
     * @since 3.4
     */
    private InformationControlReplacer fInformationControlReplacer;

    /** Indicates the enable state of this manager */
    private bool fEnabled= false;

    /** Cached, computed size constraints of the information control in points */
    private Point fSizeConstraints;

    /** The vertical margin when laying out the information control */
    private int fMarginY= 5;

    /** The horizontal margin when laying out the information control */
    private int fMarginX= 5;

    /** The width constraint of the information control in characters */
    private int fWidthConstraint= 60;

    /** The height constraint of the information control  in characters */
    private int fHeightConstraint= 6;

    /** Indicates whether the size constraints should be enforced as minimal control size */
    private bool fEnforceAsMinimalSize= false;

    /** Indicates whether the size constraints should be enforced as maximal control size */
    private bool fEnforceAsMaximalSize= false;

    /** The anchor for laying out the information control in relation to the subject control */
    private Anchor fAnchor= ANCHOR_BOTTOM;

    /**
     * The anchor sequence used to layout the information control if the original anchor
     * can not be used because the information control would not fit in the display client area.
     * <p>
     * The fallback anchor for a given anchor is the one that comes directly after the given anchor or
     * is the first one in the sequence if the given anchor is the last one in the sequence.
     * <p>
     * </p>
     * Note: This sequence is ignored if the original anchor is not contained in this sequence.
     * </p>
     *
     * @see #fAnchor
     */
    private Anchor[] fFallbackAnchors= ANCHORS;

    /**
     * The custom information control creator.
     * @since 3.0
     */
    private volatile IInformationControlCreator fCustomInformationControlCreator;

    /**
     * Tells whether a custom information control is in use.
     * @since 3.0
     */
    private bool fIsCustomInformationControl= false;

    /**
     * The dialog settings for the control's bounds.
     * @since 3.0
     */
    private IDialogSettings fDialogSettings;

    /**
     * Tells whether the control's location should be read
     * from the dialog settings and whether the last
     * valid control's size is stored back into the  settings.
     *
     * @since 3.0
     */
    private bool fIsRestoringLocation;

    /**
     * Tells whether the control's size should be read
     * from the dialog settings and whether the last
     * valid control's size is stored back into the  settings.
     *
     * @since 3.0
     */
    private bool fIsRestoringSize;

    /**
     * The dispose listener on the subject control.
     *
     * @since 3.1
     */
    private DisposeListener fSubjectControlDisposeListener;


    /**
     * Creates a new information control manager using the given information control creator.
     * By default the following configuration is given:
     * <ul>
     * <li> enabled is false
     * <li> horizontal margin is 5 points
     * <li> vertical margin is 5 points
     * <li> width constraint is 60 characters
     * <li> height constraint is 6 characters
     * <li> enforce constraints as minimal size is false
     * <li> enforce constraints as maximal size is false
     * <li> layout anchor is ANCHOR_BOTTOM
     * <li> fall back anchors is { ANCHOR_TOP, ANCHOR_BOTTOM, ANCHOR_LEFT, ANCHOR_RIGHT, ANCHOR_GLOBAL }
     * <li> takes focus when visible is false
     * </ul>
     *
     * @param creator the information control creator
     */
    protected this(IInformationControlCreator creator) {
        Assert.isNotNull(creator);
        fInformationControlCreator= creator;
    }

    /**
     * Computes the information to be displayed and the area in which the computed
     * information is valid. Implementation of this method must finish their computation
     * by setting the computation results using <code>setInformation</code>.
     */
    abstract protected void computeInformation();

    /**
     * Sets the parameters of the information to be displayed. These are the information itself and
     * the area for which the given information is valid. This so called subject area is a graphical
     * region of the information control's subject control. This method calls <code>presentInformation()</code>
     * to trigger the presentation of the computed information.
     *
     * @param information the information, or <code>null</code> if none is available
     * @param subjectArea the subject area, or <code>null</code> if none is available
     */
    protected final void setInformation(String information, Rectangle subjectArea) {
        setInformation(cast(Object)information, subjectArea);
    }

    /**
     * Sets the parameters of the information to be displayed. These are the information itself and
     * the area for which the given information is valid. This so called subject area is a graphical
     * region of the information control's subject control. This method calls <code>presentInformation()</code>
     * to trigger the presentation of the computed information.
     *
     * @param information the information, or <code>null</code> if none is available
     * @param subjectArea the subject area, or <code>null</code> if none is available
     * @since  2.1
     */
    protected final void setInformation(Object information, Rectangle subjectArea) {
        fInformation= information;
        fSubjectArea= subjectArea;
        presentInformation();
    }

    /**
     * Sets the information control closer for this manager.
     *
     * @param closer the information control closer for this manager
     */
    protected void setCloser(IInformationControlCloser closer) {
        fInformationControlCloser= closer;
    }

    /**
     * Sets the information control replacer for this manager and disposes the
     * old one if set.
     *
     * @param replacer the information control replacer for this manager, or
     *            <code>null</code> if no information control replacing should
     *            take place
     * @since 3.4
     */
    void setInformationControlReplacer(InformationControlReplacer replacer) {
        if (fInformationControlReplacer !is null)
            fInformationControlReplacer.dispose();
        fInformationControlReplacer= replacer;
    }

    /**
     * Returns the current information control replacer or <code>null</code> if none has been installed.
     *
     * @return the current information control replacer or <code>null</code> if none has been installed
     * @since 3.4
     */
    InformationControlReplacer getInformationControlReplacer() {
        return fInformationControlReplacer;
    }

    /**
     * Returns whether an information control replacer has been installed.
     *
     * @return whether an information control replacer has been installed
     * @since 3.4
     */
    bool hasInformationControlReplacer() {
        return fInformationControlReplacer !is null;
    }

    /**
     * Tests whether the given information control is replaceable.
     *
     * @param iControl information control or <code>null</code> if none
     * @return <code>true</code> if information control is replaceable, <code>false</code> otherwise
     * @since 3.4
     */
    bool canReplace(IInformationControl iControl) {
        return cast(IInformationControlExtension3)iControl
                && cast(IInformationControlExtension5)iControl
                && (cast(IInformationControlExtension5) iControl).getInformationPresenterControlCreator() !is null;
    }

    /**
     * Returns the current information control, or <code>null</code> if none.
     *
     * @return the current information control, or <code>null</code> if none
     * @since 3.4
     */
    IInformationControl getCurrentInformationControl() {
        return fInformationControl;
    }

    /**
     * Tells whether this manager's information control is currently being replaced.
     *
     * @return <code>true</code> if a replace is in progress
     * @since 3.4
     */
    bool isReplaceInProgress() {
        return fInformationControlReplacer !is null && fInformationControlReplacer.isReplacing();
    }

    /**
     * Sets the horizontal and vertical margin to be used when laying out the
     * information control relative to the subject control.
     *
     * @param xMargin the x-margin
     * @param yMargin the y-Margin
     */
    public void setMargins(int xMargin, int yMargin) {
        fMarginX= xMargin;
        fMarginY= yMargin;
    }

    /**
     * Sets the width- and height constraints of the information control.
     *
     * @param widthInChar the width constraint in number of characters
     * @param heightInChar the height constrain in number of characters
     * @param enforceAsMinimalSize indicates whether the constraints describe the minimal allowed size of the control
     * @param enforceAsMaximalSize indicates whether the constraints describe the maximal allowed size of the control
     */
    public void setSizeConstraints(int widthInChar, int heightInChar, bool enforceAsMinimalSize, bool enforceAsMaximalSize) {
        fSizeConstraints= null;
        fWidthConstraint= widthInChar;
        fHeightConstraint= heightInChar;
        fEnforceAsMinimalSize= enforceAsMinimalSize;
        fEnforceAsMaximalSize= enforceAsMaximalSize;

    }

    /**
     * Tells this information control manager to open the information
     * control with the values contained in the given dialog settings
     * and to store the control's last valid size in the given dialog
     * settings.
     * <p>
     * Note: This API is only valid if the information control implements
     * {@link IInformationControlExtension3}. Not following this restriction
     * will later result in an {@link UnsupportedOperationException}.
     * </p>
     * <p>
     * The constants used to store the values are:
     * <ul>
     *  <li>{@link AbstractInformationControlManager#STORE_LOCATION_X}</li>
     *  <li>{@link AbstractInformationControlManager#STORE_LOCATION_Y}</li>
     *  <li>{@link AbstractInformationControlManager#STORE_SIZE_WIDTH}</li>
     *  <li>{@link AbstractInformationControlManager#STORE_SIZE_HEIGHT}</li>
     * </ul>
     * </p>
     *
     * @param dialogSettings
     * @param restoreLocation <code>true</code> iff the location is must be (re-)stored
     * @param restoreSize <code>true</code>iff the size is (re-)stored
     * @since 3.0
     */
    public void setRestoreInformationControlBounds(IDialogSettings dialogSettings, bool restoreLocation, bool restoreSize) {
        Assert.isTrue(dialogSettings !is null && (restoreLocation || restoreSize));
        fDialogSettings= dialogSettings;
        fIsRestoringLocation= restoreLocation;
        fIsRestoringSize= restoreSize;
    }

    /**
     * Sets the anchor used for laying out the information control relative to the
     * subject control. E.g, using <code>ANCHOR_TOP</code> indicates that the
     * information control is position above the area for which the information to
     * be displayed is valid.
     *
     * @param anchor the layout anchor
     */
    public void setAnchor(Anchor anchor) {
        fAnchor= anchor;
    }

    /**
     * Sets the anchors fallback sequence used to layout the information control if the original
     * anchor can not be used because the information control would not fit in the display client
     * area.
     * <p>
     * The fallback anchor for a given anchor is the one that comes directly after the given anchor or
     * is the first one in the sequence if the given anchor is the last one in the sequence.
     * <p>
     * </p>
     * Note: This sequence is ignored if the original anchor is not contained in this list.
     * </p>
     *
     * @param fallbackAnchors the array with the anchor fallback sequence
     * @see #setAnchor(AbstractInformationControlManager.Anchor)
     */
    public void setFallbackAnchors(Anchor[] fallbackAnchors) {
        if (fallbackAnchors !is null) {
            fFallbackAnchors= new Anchor[fallbackAnchors.length];
            System.arraycopy(fallbackAnchors, 0, fFallbackAnchors, 0, fallbackAnchors.length);
        } else
            fFallbackAnchors= null;
    }

    /**
     * Sets the temporary custom control creator, overriding this manager's default information control creator.
     *
     * @param informationControlCreator the creator, possibly <code>null</code>
     * @since 3.0
     */
    protected void setCustomInformationControlCreator(IInformationControlCreator informationControlCreator)  {
        if (informationControlCreator !is null && cast(IInformationControlCreatorExtension)fCustomInformationControlCreator) {
            IInformationControlCreatorExtension extension= cast(IInformationControlCreatorExtension) fCustomInformationControlCreator;
            if (extension.canReplace(informationControlCreator))
                return;
        }
        fCustomInformationControlCreator= informationControlCreator;
    }

    /**
     * Tells the manager whether it should set the focus to the information control when made visible.
     *
     * @param takesFocus <code>true</code> if information control should take focus when made visible
     */
    public void takesFocusWhenVisible(bool takesFocus) {
        fTakesFocusWhenVisible= takesFocus;
    }

    /**
     * Handles the disposal of the subject control. By default, the information control
     * is disposed by calling <code>disposeInformationControl</code>. Subclasses may extend
     * this method.
     */
    protected void handleSubjectControlDisposed() {
        disposeInformationControl();
    }

    /**
     * Installs this manager on the given control. The control is now taking the role of
     * the subject control. This implementation sets the control also as the information
     * control closer's subject control and automatically enables this manager.
     *
     * @param subjectControl the subject control
     */
    public void install(Control subjectControl) {
        if (fSubjectControl !is null && !fSubjectControl.isDisposed() && fSubjectControlDisposeListener !is null)
            fSubjectControl.removeDisposeListener(fSubjectControlDisposeListener);

        fSubjectControl= subjectControl;

        if (fSubjectControl !is null)
            fSubjectControl.addDisposeListener(getSubjectControlDisposeListener());

        if (fInformationControlCloser !is null)
            fInformationControlCloser.setSubjectControl(subjectControl);

        setEnabled(true);
        fDisposed= false;
    }

    /**
     * Returns the dispose listener which gets added
     * to the subject control.
     *
     * @return the dispose listener
     * @since 3.1
     */
    private DisposeListener getSubjectControlDisposeListener() {
        if (fSubjectControlDisposeListener is null) {
            fSubjectControlDisposeListener= new class()  DisposeListener {
                public void widgetDisposed(DisposeEvent e) {
                    handleSubjectControlDisposed();
                }
            };
        }
        return fSubjectControlDisposeListener;
    }

    /**
     * Returns the subject control of this manager/information control.
     *
     * @return the subject control
     */
    protected Control getSubjectControl() {
        return fSubjectControl;
    }

    /**
     * Returns the actual subject area.
     *
     * @return the actual subject area
     */
    protected Rectangle getSubjectArea() {
        return fSubjectArea;
    }

    /**
     * Sets the enable state of this manager.
     *
     * @param enabled the enable state
     * @deprecated visibility will be changed to protected
     */
    public void setEnabled(bool enabled) {
        fEnabled= enabled;
    }

    /**
     * Returns whether this manager is enabled or not.
     *
     * @return <code>true</code> if this manager is enabled otherwise <code>false</code>
     */
    protected bool isEnabled() {
        return fEnabled;
    }

    /**
     * Computes the size constraints of the information control in points based on the
     * default font of the given subject control as well as the size constraints in character
     * width.
     *
     * @param subjectControl the subject control
     * @param informationControl the information control whose size constraints are computed
     * @return the computed size constraints in points
     */
    protected Point computeSizeConstraints(Control subjectControl, IInformationControl informationControl) {

        if (fSizeConstraints is null) {
            if ( cast(IInformationControlExtension5)informationControl ) {
                IInformationControlExtension5 iControl5= cast(IInformationControlExtension5) informationControl;
                fSizeConstraints= iControl5.computeSizeConstraints(fWidthConstraint, fHeightConstraint);
                if (fSizeConstraints !is null)
                    return Geometry.copy(fSizeConstraints);
            }
            if (subjectControl is null)
                return null;

            GC gc= new GC(subjectControl);
            gc.setFont(subjectControl.getFont());
            int width= gc.getFontMetrics().getAverageCharWidth();
            int height = gc.getFontMetrics().getHeight();
            gc.dispose();

            fSizeConstraints= new Point (fWidthConstraint * width, fHeightConstraint * height);
        }

        return new Point(fSizeConstraints.x, fSizeConstraints.y);
    }

    /**
     * Computes the size constraints of the information control in points.
     *
     * @param subjectControl the subject control
     * @param subjectArea the subject area
     * @param informationControl the information control whose size constraints are computed
     * @return the computed size constraints in points
     * @since 3.0
     */
    protected Point computeSizeConstraints(Control subjectControl, Rectangle subjectArea, IInformationControl informationControl) {
        return computeSizeConstraints(subjectControl, informationControl);
    }

    /**
     * Handles the disposal of the information control. By default, the information
     * control closer is stopped.
     */
    protected void handleInformationControlDisposed() {

        storeInformationControlBounds();

        if ( cast(IInformationControlExtension5)fInformationControl )
            fSizeConstraints= null;
        fInformationControl= null;
        if (fInformationControlCloser !is null) {
            fInformationControlCloser.setInformationControl(null); //XXX: null is against the spec
            fInformationControlCloser.stop();
        }
    }

    /**
     * Returns the information control. If the information control has not been created yet,
     * it is automatically created.
     *
     * @return the information control
     */
    protected IInformationControl getInformationControl() {

        if (fDisposed)
            return fInformationControl;

        IInformationControlCreator creator= null;

        if (fCustomInformationControlCreator is null) {
            creator= fInformationControlCreator;
            if (fIsCustomInformationControl && fInformationControl !is null) {
                if ( cast(IInformationControlExtension5)fInformationControl )
                    fSizeConstraints= null;
                fInformationControl.dispose();
                fInformationControl= null;
            }
            fIsCustomInformationControl= false;

        } else  {

            creator= fCustomInformationControlCreator;
            if ( cast(IInformationControlCreatorExtension)creator )  {
                IInformationControlCreatorExtension extension= cast(IInformationControlCreatorExtension) creator;
                if (fInformationControl !is null && extension.canReuse(fInformationControl))
                    return fInformationControl;
            }
            if (fInformationControl !is null)  {
                if ( cast(IInformationControlExtension5)fInformationControl )
                    fSizeConstraints= null;
                fInformationControl.dispose();
                fInformationControl= null;
            }
            fIsCustomInformationControl= true;
        }

        if (fInformationControl is null) {
            fInformationControl= creator.createInformationControl(fSubjectControl.getShell());
            fInformationControl.addDisposeListener(new class()  DisposeListener {
                public void widgetDisposed(DisposeEvent e) {
                    handleInformationControlDisposed();
                }
            });

            if (fInformationControlCloser !is null)
                fInformationControlCloser.setInformationControl(fInformationControl);
        }

        return fInformationControl;
    }

    /**
     * Computes the display location of the information control. The location is computed
     * considering the given subject area, the anchor at the subject area, and the
     * size of the information control. This method does not care about whether the information
     * control would be completely visible when placed at the result location.
     *
     * @param subjectArea the subject area
     * @param controlSize the size of the information control
     * @param anchor the anchor at the subject area
     * @return the display location of the information control
     */
    protected Point computeLocation(Rectangle subjectArea, Point controlSize, Anchor anchor) {
        int xShift= 0;
        int yShift= 0;

        switch (anchor.getSWTFlag()) {
            case DWT.CENTER:
                Point subjectControlSize= fSubjectControl.getSize();
                Point location= new Point(subjectControlSize.x / 2, subjectControlSize.y / 2);
                location.x -= (controlSize.x / 2);
                location.y -= (controlSize.y / 2);
                return fSubjectControl.toDisplay(location);
            case DWT.BOTTOM:
                yShift= subjectArea.height + fMarginY;
                break;
            case DWT.RIGHT:
                xShift= fMarginX + subjectArea.width;
                break;
            case DWT.TOP:
                yShift= -controlSize.y - fMarginY;
                break;
            case DWT.LEFT:
                xShift= -controlSize.x - fMarginX;
                break;
        }

        bool isRTL= fSubjectControl !is null && (fSubjectControl.getStyle() & DWT.RIGHT_TO_LEFT) !is 0;
        if (isRTL)
            xShift += controlSize.x;

        return  fSubjectControl.toDisplay(new Point(subjectArea.x + xShift, subjectArea.y + yShift));
    }

    /**
     * Computes the area available for an information control given an anchor and the subject area
     * within <code>bounds</code>.
     *
     * @param subjectArea the subject area
     * @param bounds the bounds
     * @param anchor the anchor at the subject area
     * @return the area available at the given anchor relative to the subject area, confined to the
     *         monitor's client area
     * @since 3.3
     */
    protected Rectangle computeAvailableArea(Rectangle subjectArea, Rectangle bounds, Anchor anchor) {
        Rectangle area;
        switch (anchor.getSWTFlag()) {
            case DWT.CENTER:
                area= bounds;
                break;
            case DWT.BOTTOM:
                int y= subjectArea.y + subjectArea.height + fMarginY;
                area= new Rectangle(bounds.x, y, bounds.width, bounds.y + bounds.height - y);
                break;
            case DWT.RIGHT:
                int x= subjectArea.x + subjectArea.width + fMarginX;
                area= new Rectangle(x, bounds.y, bounds.x + bounds.width - x, bounds.height);
                break;
            case DWT.TOP:
                area= new Rectangle(bounds.x, bounds.y, bounds.width, subjectArea.y - bounds.y - fMarginY);
                break;
            case DWT.LEFT:
                area= new Rectangle(bounds.x, bounds.y, subjectArea.x - bounds.x - fMarginX, bounds.height);
                break;
            default:
                Assert.isLegal(false);
                return null;
        }

        // Don't return negative areas if the subjectArea overlaps with the monitor bounds.
        area.intersect(bounds);
        return area;
    }

    /**
     * Checks whether a control of the given size at the given location would be completely visible
     * in the given display area when laid out by using the given anchor. If not, this method tries
     * to shift the control orthogonal to the direction given by the anchor to make it visible. If possible
     * it updates the location.<p>
     * This method returns <code>true</code> if the potentially updated position results in a
     * completely visible control, or <code>false</code> otherwise.
     *
     *
     * @param location the location of the control
     * @param size the size of the control
     * @param displayArea the display area in which the control should be visible
     * @param anchor anchor for lying out the control
     * @return <code>true</code>if the updated location is useful
     */
    protected bool updateLocation(Point location, Point size, Rectangle displayArea, Anchor anchor) {

        int displayLowerRightX= displayArea.x + displayArea.width;
        int displayLowerRightY= displayArea.y + displayArea.height;
        int lowerRightX= location.x + size.x;
        int lowerRightY= location.y + size.y;

        if (ANCHOR_BOTTOM is anchor || ANCHOR_TOP is anchor) {

            if (ANCHOR_BOTTOM is anchor) {
                if (lowerRightY > displayLowerRightY)
                    return false;
            } else {
                if (location.y < displayArea.y)
                    return false;
            }

            if (lowerRightX > displayLowerRightX)
                location.x= location.x - (lowerRightX - displayLowerRightX);

            return (location.x >= displayArea.x && location.y >= displayArea.y);

        } else if (ANCHOR_RIGHT is anchor || ANCHOR_LEFT is anchor) {

            if (ANCHOR_RIGHT is anchor) {
                if (lowerRightX > displayLowerRightX)
                    return false;
            } else {
                if (location.x < displayArea.x)
                    return false;
            }

            if (lowerRightY > displayLowerRightY)
                location.y= location.y - (lowerRightY - displayLowerRightY);

            return (location.x >= displayArea.x && location.y >= displayArea.y);

        } else if (ANCHOR_GLOBAL is anchor) {

            if (lowerRightX > displayLowerRightX)
                location.x= location.x - (lowerRightX - displayLowerRightX);

            if (lowerRightY > displayLowerRightY)
                location.y= location.y - (lowerRightY - displayLowerRightY);

            return (location.x >= displayArea.x && location.y >= displayArea.y);
        }

        return false;
    }

    /**
     * Returns the next fallback anchor as specified by this manager's
     * fallback anchor sequence.
     * <p>
     * The fallback anchor for the given anchor is the one that comes directly after
     * the given anchor or is the first one in the sequence if the given anchor is the
     * last one in the sequence.
     * </p>
     * <p>
     * Note: It is the callers responsibility to prevent an endless loop i.e. to test
     * whether a given anchor has already been used once.
     * then
     * </p>
     *
     * @param anchor the current anchor
     * @return the next fallback anchor or <code>null</code> if no fallback anchor is available
     */
    protected Anchor getNextFallbackAnchor(Anchor anchor) {

        if (anchor is null || fFallbackAnchors is null)
            return null;

        for (int i= 0; i < fFallbackAnchors.length; i++) {
            if (fFallbackAnchors[i] is anchor)
                return fFallbackAnchors[i + 1 is fFallbackAnchors.length ? 0 : i + 1];
        }

        return null;
    }

    /**
     * Computes the location of the information control depending on the
     * subject area and the size of the information control. This method attempts
     * to find a location at which the information control lies completely in the display's
     * client area while honoring the manager's default anchor. If this isn't possible using the
     * default anchor, the fallback anchors are tried out.
     *
     * @param subjectArea the information area
     * @param controlSize the size of the information control
     * @return the computed location of the information control
     */
    protected Point computeInformationControlLocation(Rectangle subjectArea, Point controlSize) {
        Rectangle subjectAreaDisplayRelative= Geometry.toDisplay(fSubjectControl, subjectArea);

        Point upperLeft;
        Anchor testAnchor= fAnchor;
        Rectangle bestBounds= null;
        int bestArea= Integer.MIN_VALUE;
        Anchor bestAnchor= null;
        do {

            upperLeft= computeLocation(subjectArea, controlSize, testAnchor);
            Monitor monitor= getClosestMonitor(subjectAreaDisplayRelative, testAnchor);
            if (updateLocation(upperLeft, controlSize, monitor.getClientArea(), testAnchor))
                return upperLeft;

            // compute available area for this anchor and update if better than best
            Rectangle available= computeAvailableArea(subjectAreaDisplayRelative, monitor.getClientArea(), testAnchor);
            Rectangle proposed= new Rectangle(upperLeft.x, upperLeft.y, controlSize.x, controlSize.y);
            available.intersect(proposed);
            int area= available.width * available.height;
            if (area > bestArea) {
                bestArea= area;
                bestBounds= available;
                bestAnchor= testAnchor;
            }

            testAnchor= getNextFallbackAnchor(testAnchor);

        } while (testAnchor !is fAnchor && testAnchor !is null);

        // no anchor is perfect - select the one with larges area and set the size to not overlap with the subjectArea
        if (bestAnchor !is ANCHOR_GLOBAL)
            Geometry.set(controlSize, Geometry.getSize(bestBounds));
        return Geometry.getLocation(bestBounds);
    }

    /**
     * Gets the closest monitor given an anchor and the subject area.
     *
     * @param area the subject area
     * @param anchor the anchor
     * @return the monitor closest to the edge of <code>area</code> defined by
     *         <code>anchor</code>
     * @since 3.3
     */
    private Monitor getClosestMonitor(Rectangle area, Anchor anchor) {
        Point center;
        if (ANCHOR_GLOBAL is anchor)
            center= Geometry.centerPoint(area);
        else
            center= Geometry.centerPoint(Geometry.getExtrudedEdge(area, 0, anchor.getSWTFlag()));
        return getClosestMonitor(fSubjectControl.getDisplay(), Geometry.createRectangle(center, new Point(0, 0)));
    }

    /**
     * Copied from dwtx.jface.window.Window. Returns the monitor whose client area contains
     * the given point. If no monitor contains the point, returns the monitor that is closest to the
     * point. If this is ever made public, it should be moved into a separate utility class.
     *
     * @param display the display to search for monitors
     * @param rectangle the rectangle to find the closest monitor for (display coordinates)
     * @return the monitor closest to the given point
     * @since 3.3
     */
    private Monitor getClosestMonitor(Display display, Rectangle rectangle) {
        int closest = Integer.MAX_VALUE;

        Point toFind= Geometry.centerPoint(rectangle);
        Monitor[] monitors = display.getMonitors();
        Monitor result = monitors[0];

        for (int idx = 0; idx < monitors.length; idx++) {
            Monitor current = monitors[idx];

            Rectangle clientArea = current.getClientArea();

            if (clientArea.contains(toFind)) {
                return current;
            }

            int distance = Geometry.distanceSquared(Geometry.centerPoint(clientArea), toFind);
            if (distance < closest) {
                closest = distance;
                result = current;
            }
        }

        return result;
    }

    /**
     * Computes information to be displayed as well as the subject area
     * and initiates that this information is presented in the information control.
     * This happens only if this controller is enabled.
     */
    public void showInformation() {
        if (fEnabled)
            doShowInformation();
    }

    /**
     * Computes information to be displayed as well as the subject area
     * and initiates that this information is presented in the information control.
     */
    protected void doShowInformation() {
        fSubjectArea= null;
        fInformation= null;
        computeInformation();
    }

    /**
     * Presents the information in the information control or hides the information
     * control if no information should be presented. The information has previously
     * been set using <code>setInformation</code>.
     */
    protected void presentInformation() {
        bool hasContents= false;
        if ( cast(String)fInformation )
            hasContents= (cast(String)fInformation).trim().length() > 0;
        else
            hasContents= (fInformation !is null);

        if (fSubjectArea !is null && hasContents)
            internalShowInformationControl(fSubjectArea, fInformation);
        else
            hideInformationControl();
    }

    /**
     * Opens the information control with the given information and the specified
     * subject area. It also activates the information control closer.
     *
     * @param subjectArea the information area
     * @param information the information
     */
    private void internalShowInformationControl(Rectangle subjectArea, Object information) {
        if ( cast(InformationControlReplacer)this ) {
            (cast(InformationControlReplacer) this).showInformationControl(subjectArea, information);
            return;
        }

        IInformationControl informationControl= getInformationControl();
        if (informationControl !is null) {

            Point sizeConstraints= computeSizeConstraints(fSubjectControl, fSubjectArea, informationControl);
            if ( cast(IInformationControlExtension3)informationControl ) {
                IInformationControlExtension3 iControl3= cast(IInformationControlExtension3) informationControl;
                Rectangle trim= iControl3.computeTrim();
                sizeConstraints.x += trim.width;
                sizeConstraints.y += trim.height;
            }
            informationControl.setSizeConstraints(sizeConstraints.x, sizeConstraints.y);

            if ( cast(IInformationControlExtension2)informationControl )
                (cast(IInformationControlExtension2)informationControl).setInput(information);
            else
                informationControl.setInformation(information.toString());

            if ( cast(IInformationControlExtension)informationControl ) {
                IInformationControlExtension extension= cast(IInformationControlExtension)informationControl;
                if (!extension.hasContents())
                    return;
            }

            Point size= null;
            Point location= null;
            Rectangle bounds= restoreInformationControlBounds();

            if (bounds !is null) {
                if (bounds.x > -1 && bounds.y > -1)
                    location= Geometry.getLocation(bounds);

                if (bounds.width > -1 && bounds.height > -1)
                    size= Geometry.getSize(bounds);
            }

            if (size is null)
                size= informationControl.computeSizeHint();

            if (fEnforceAsMinimalSize)
                size= Geometry.max(size, sizeConstraints);
            if (fEnforceAsMaximalSize)
                size= Geometry.min(size, sizeConstraints);

            if (location is null)
                location= computeInformationControlLocation(subjectArea, size);

            Rectangle controlBounds= Geometry.createRectangle(location, size);
            cropToClosestMonitor(controlBounds);
            location= Geometry.getLocation(controlBounds);
            size= Geometry.getSize(controlBounds);
            informationControl.setLocation(location);
            informationControl.setSize(size.x, size.y);

            showInformationControl(subjectArea);
        }
    }

    /**
     * Crops the given bounds such that they lie completely on the closest monitor.
     *
     * @param bounds shell bounds to crop
     * @since 3.4
     */
    void cropToClosestMonitor(Rectangle bounds) {
        Rectangle monitorBounds= getClosestMonitor(fSubjectControl.getDisplay(), bounds).getClientArea();
        bounds.intersect(monitorBounds);
    }

    /**
     * Hides the information control and stops the information control closer.
     */
    protected void hideInformationControl() {
        if (fInformationControl !is null) {
            storeInformationControlBounds();
            fInformationControl.setVisible(false);
            if (fInformationControlCloser !is null)
                fInformationControlCloser.stop();
        }
    }

    /**
     * Shows the information control and starts the information control closer.
     * This method may not be called by clients.
     *
     * @param subjectArea the information area
     */
    protected void showInformationControl(Rectangle subjectArea) {
        fInformationControl.setVisible(true);

        if (fTakesFocusWhenVisible)
            fInformationControl.setFocus();

        if (fInformationControlCloser !is null)
            fInformationControlCloser.start(subjectArea);
    }

    /**
     * Replaces this manager's information control as defined by
     * the information control replacer.
     * <strong>Must only be called when {@link #fInformationControl} instanceof {@link IInformationControlExtension3}!</strong>
     *
     * @param takeFocus <code>true</code> iff the replacing information control should take focus
     *
     * @since 3.4
     */
    void replaceInformationControl(bool takeFocus) {
        if (fInformationControlReplacer !is null && canReplace(fInformationControl)) {
            IInformationControlExtension3 iControl3= cast(IInformationControlExtension3) fInformationControl;
            Rectangle b= iControl3.getBounds();
            Rectangle t= iControl3.computeTrim();
            Rectangle contentBounds= new Rectangle(b.x - t.x, b.y - t.y, b.width - t.width, b.height - t.height);
            IInformationControlCreator informationPresenterControlCreator= (cast(IInformationControlExtension5) fInformationControl).getInformationPresenterControlCreator();
            fInformationControlReplacer.replaceInformationControl(informationPresenterControlCreator, contentBounds, fInformation, fSubjectArea, takeFocus);
        }
        hideInformationControl();
    }

    /**
     * Disposes this manager's information control.
     */
    public void disposeInformationControl() {
        if (fInformationControl !is null) {
            fInformationControl.dispose();
            handleInformationControlDisposed();
        }
    }

    /**
     * Disposes this manager and if necessary all dependent parts such as
     * the information control. For symmetry it first disables this manager.
     */
    public void dispose() {
        if (!fDisposed) {

            fDisposed= true;

            setEnabled(false);
            disposeInformationControl();

            if (fInformationControlReplacer !is null) {
                fInformationControlReplacer.dispose();
                fInformationControlReplacer= null;
            }

            if (fSubjectControl !is null && !fSubjectControl.isDisposed() && fSubjectControlDisposeListener !is null)
                fSubjectControl.removeDisposeListener(fSubjectControlDisposeListener);
            fSubjectControl= null;
            fSubjectControlDisposeListener= null;

            fIsCustomInformationControl= false;
            fCustomInformationControlCreator= null;
            fInformationControlCreator= null;
            fInformationControlCloser= null;
        }
    }

    // ------ control's size handling dialog settings ------

    /**
     * Stores the information control's bounds.
     *
     * @since 3.0
     */
    protected void storeInformationControlBounds() {
        if (fDialogSettings is null || fInformationControl is null || !(fIsRestoringLocation || fIsRestoringSize))
            return;

        if (!( cast(IInformationControlExtension3)fInformationControl ))
            throw new UnsupportedOperationException();

        bool controlRestoresSize= (cast(IInformationControlExtension3)fInformationControl).restoresSize();
        bool controlRestoresLocation= (cast(IInformationControlExtension3)fInformationControl).restoresLocation();

        Rectangle bounds= (cast(IInformationControlExtension3)fInformationControl).getBounds();
        if (bounds is null)
            return;

        if (fIsRestoringSize && controlRestoresSize) {
            fDialogSettings.put(STORE_SIZE_WIDTH, bounds.width);
            fDialogSettings.put(STORE_SIZE_HEIGHT, bounds.height);
        }
        if (fIsRestoringLocation && controlRestoresLocation) {
            fDialogSettings.put(STORE_LOCATION_X, bounds.x);
            fDialogSettings.put(STORE_LOCATION_Y, bounds.y);
        }
    }
    /**
     * Restores the information control's bounds.
     *
     * @return the stored bounds
     * @since 3.0
     */
    protected Rectangle restoreInformationControlBounds() {
        if (fDialogSettings is null || !(fIsRestoringLocation || fIsRestoringSize))
            return null;

        if (!( cast(IInformationControlExtension3)fInformationControl ))
            throw new UnsupportedOperationException();

        bool controlRestoresSize= (cast(IInformationControlExtension3)fInformationControl).restoresSize();
        bool controlRestoresLocation= (cast(IInformationControlExtension3)fInformationControl).restoresLocation();

        Rectangle bounds= new Rectangle(-1, -1, -1, -1);

        if (fIsRestoringSize && controlRestoresSize) {
            try {
                bounds.width= fDialogSettings.getInt(STORE_SIZE_WIDTH);
                bounds.height= fDialogSettings.getInt(STORE_SIZE_HEIGHT);
            } catch (NumberFormatException ex) {
                bounds.width= -1;
                bounds.height= -1;
            }
        }

        if (fIsRestoringLocation && controlRestoresLocation) {
            try {
                bounds.x= fDialogSettings.getInt(STORE_LOCATION_X);
                bounds.y= fDialogSettings.getInt(STORE_LOCATION_Y);
            } catch (NumberFormatException ex) {
                bounds.x= -1;
                bounds.y= -1;
            }
        }

        // sanity check
        if (bounds.x is -1 && bounds.y is -1 && bounds.width is -1 && bounds.height is -1)
            return null;

        Rectangle maxBounds= null;
        if (fSubjectControl !is null && !fSubjectControl.isDisposed())
            maxBounds= fSubjectControl.getDisplay().getBounds();
        else {
            // fallback
            Display display= Display.getCurrent();
            if (display is null)
                display= Display.getDefault();
            if (display !is null && !display.isDisposed())
                maxBounds= display.getBounds();
        }


        if (bounds.width > -1 && bounds.height > -1) {
            if (maxBounds !is null) {
                bounds.width= Math.min(bounds.width, maxBounds.width);
                bounds.height= Math.min(bounds.height, maxBounds.height);
            }

            // Enforce an absolute minimal size
            bounds.width= Math.max(bounds.width, 30);
            bounds.height= Math.max(bounds.height, 30);
        }

        if (bounds.x > -1 && bounds.y > -1 && maxBounds !is null) {
            bounds.x= Math.max(bounds.x, maxBounds.x);
            bounds.y= Math.max(bounds.y, maxBounds.y);

            if (bounds .width > -1 && bounds.height > -1) {
                bounds.x= Math.min(bounds.x, maxBounds.width - bounds.width);
                bounds.y= Math.min(bounds.y, maxBounds.height - bounds.height);
            }
        }

        return bounds;
    }

    /**
     * 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 MyInternalAccessor();
    }
}