org.eclipse.jface.text/src/org/eclipse/jface/text/DefaultInformationControl.java - platform/eclipse.platform.text - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.jface.text;

 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.StyledText;
 import org.eclipse.swt.events.DisposeEvent;
 import org.eclipse.swt.events.DisposeListener;
 import org.eclipse.swt.events.FocusListener;
 import org.eclipse.swt.events.KeyEvent;
 import org.eclipse.swt.events.KeyListener;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.FontData;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;


 /**
  * Text based implementation of <code>IInformationControl</code>.
  * Displays information in a styled text widget. Before displaying, the
  * information set to this information control is processed by an
  * <code>IInformationPresenter</code>.
  *
  * @since 2.0
  */
 public class DefaultInformationControl implements IInformationControl, IInformationControlExtension, IInformationControlExtension3,  DisposeListener {

 	/**
 	 * An information presenter determines the style presentation
 	 * of information displayed in the default information control.
 	 * The interface can be implemented by clients.
 	 */
 	public static interface IInformationPresenter {

 		/**
 		 * Updates the given presentation of the given information and
 		 * thereby may manipulate the information to be displayed. The manipulation
 		 * could be the extraction of textual encoded style information etc. Returns the
 		 * manipulated information.
 		 *
 		 * @param display the display of the information control
 		 * @param hoverInfo the information to be presented
 		 * @param presentation the presentation to be updated
 		 * @param maxWidth the maximal width in pixels
 		 * @param maxHeight the maximal height in pixels
 		 *
 		 * @return the manipulated information
 		 */
 		String updatePresentation(Display display, String hoverInfo, TextPresentation presentation, int maxWidth, int maxHeight);
 	}

 	/** Border thickness in pixels. */
 	private static final int BORDER= 1;

 	/** The control's shell */
 	private Shell fShell;
 	/** The control's text widget */
 	private StyledText fText;
 	/** The information presenter */
 	private IInformationPresenter fPresenter;
 	/** A cached text presentation */
 	private TextPresentation fPresentation= new TextPresentation();
 	/** The control width constraint */
 	private int fMaxWidth= -1;
 	/** The control height constraint */
 	private int fMaxHeight= -1;
 	/**
 	 * The font of the optional status text label.
 	 *
 	 * @since 3.0
 	 */
 	private Font fStatusTextFont;

 	/**
 	 * Creates a default information control with the given shell as parent. The given
 	 * information presenter is used to process the information to be displayed. The given
 	 * styles are applied to the created styled text widget.
 	 *
 	 * @param parent the parent shell
 	 * @param shellStyle the additional styles for the shell
 	 * @param style the additional styles for the styled text widget
 	 * @param presenter the presenter to be used
 	 */
 	public DefaultInformationControl(Shell parent, int shellStyle, int style, IInformationPresenter presenter) {
 		this(parent, shellStyle, style, presenter, null);
 	}

 	/**
 	 * Creates a default information control with the given shell as parent. The given
 	 * information presenter is used to process the information to be displayed. The given
 	 * styles are applied to the created styled text widget.
 	 *
 	 * @param parent the parent shell
 	 * @param shellStyle the additional styles for the shell
 	 * @param style the additional styles for the styled text widget
 	 * @param presenter the presenter to be used
 	 * @param statusFieldText the text to be used in the optional status field
 	 *                         or <code>null</code> if the status field should be hidden
 	 * @since 3.0
 	 */
 	public DefaultInformationControl(Shell parent, int shellStyle, int style, IInformationPresenter presenter, String statusFieldText) {
 		GridLayout layout;
 		GridData gd;

 		fShell= new Shell(parent, SWT.NO_FOCUS | SWT.ON_TOP | shellStyle);
 		Display display= fShell.getDisplay();
 		fShell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));

 		Composite composite= fShell;
 		layout= new GridLayout(1, false);
 		int border= ((shellStyle & SWT.NO_TRIM) == 0) ? 0 : BORDER;
 		layout.marginHeight= border;
 		layout.marginWidth= border;
 		composite.setLayout(layout);
 		gd= new GridData(GridData.FILL_BOTH);
 		composite.setLayoutData(gd);

 		if (statusFieldText != null) {
 			composite= new Composite(composite, SWT.NONE);
 			layout= new GridLayout(1, false);
 			layout.marginHeight= 0;
 			layout.marginWidth= 0;
 			composite.setLayout(layout);
 			gd= new GridData(GridData.FILL_BOTH);
 			composite.setLayoutData(gd);
 			composite.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
 			composite.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
 		}

 		// Text field
 		fText= new StyledText(composite, SWT.MULTI | SWT.READ_ONLY | style);
 		gd= new GridData(GridData.BEGINNING | GridData.FILL_BOTH);
 		fText.setLayoutData(gd);
 		fText.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
 		fText.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
 		fText.addKeyListener(new KeyListener() {

 			public void keyPressed(KeyEvent e)  {
 				if (e.character == 0x1B) // ESC
 					fShell.dispose();
 			}

 			public void keyReleased(KeyEvent e) {}
 		});

 		fPresenter= presenter;

 		// Status field
 		if (statusFieldText != null) {

 			// Horizontal separator line
 			Label separator= new Label(composite, SWT.SEPARATOR | SWT.HORIZONTAL | SWT.LINE_DOT);
 			separator.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

 			// Status field label
 			Label statusField= new Label(composite, SWT.RIGHT);
 			statusField.setText(statusFieldText);
 			Font font= statusField.getFont();
 			FontData[] fontDatas= font.getFontData();
 			for (int i= 0; i < fontDatas.length; i++)
 				fontDatas[i].setHeight(fontDatas[i].getHeight() * 9 / 10);
 			fStatusTextFont= new Font(statusField.getDisplay(), fontDatas);
 			statusField.setFont(fStatusTextFont);
 			gd= new GridData(GridData.FILL_HORIZONTAL | GridData.HORIZONTAL_ALIGN_BEGINNING | GridData.VERTICAL_ALIGN_BEGINNING);
 			statusField.setLayoutData(gd);

 			statusField.setForeground(display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW));

 			statusField.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
 		}

 		addDisposeListener(this);
 	}

 	/**
 	 * Creates a default information control with the given shell as parent. The given
 	 * information presenter is used to process the information to be displayed. The given
 	 * styles are applied to the created styled text widget.
 	 *
 	 * @param parent the parent shell
 	 * @param style the additional styles for the styled text widget
 	 * @param presenter the presenter to be used
 	 */
 	public DefaultInformationControl(Shell parent,int style, IInformationPresenter presenter) {
 		this(parent, SWT.NO_TRIM, style, presenter);
 	}

 	/**
 	 * Creates a default information control with the given shell as parent. The given
 	 * information presenter is used to process the information to be displayed. The given
 	 * styles are applied to the created styled text widget.
 	 *
 	 * @param parent the parent shell
 	 * @param style the additional styles for the styled text widget
 	 * @param presenter the presenter to be used
 	 * @param statusFieldText the text to be used in the optional status field
 	 *                         or <code>null</code> if the status field should be hidden
 	 * @since 3.0
 	 */
 	public DefaultInformationControl(Shell parent,int style, IInformationPresenter presenter, String statusFieldText) {
 		this(parent, SWT.NO_TRIM, style, presenter, statusFieldText);
 	}

 	/**
 	 * Creates a default information control with the given shell as parent.
 	 * No information presenter is used to process the information
 	 * to be displayed. No additional styles are applied to the styled text widget.
 	 *
 	 * @param parent the parent shell
 	 */
 	public DefaultInformationControl(Shell parent) {
 		this(parent, SWT.NONE, null);
 	}

 	/**
 	 * Creates a default information control with the given shell as parent. The given
 	 * information presenter is used to process the information to be displayed.
 	 * No additional styles are applied to the styled text widget.
 	 *
 	 * @param parent the parent shell
 	 * @param presenter the presenter to be used
 	 */
 	public DefaultInformationControl(Shell parent, IInformationPresenter presenter) {
 		this(parent, SWT.NONE, presenter);
 	}

 	/*
 	 * @see IInformationControl#setInformation(String)
 	 */
 	public void setInformation(String content) {
 		if (fPresenter == null) {
 			fText.setText(content);
 		} else {
 			fPresentation.clear();
 			content= fPresenter.updatePresentation(fShell.getDisplay(), content, fPresentation, fMaxWidth, fMaxHeight);
 			if (content != null) {
 				fText.setText(content);
 				TextPresentation.applyTextPresentation(fPresentation, fText);
 			} else {
 				fText.setText(""); //$NON-NLS-1$
 			}
 		}
 	}

 	/*
 	 * @see IInformationControl#setVisible(boolean)
 	 */
 	public void setVisible(boolean visible) {
 			fShell.setVisible(visible);
 	}

 	/*
 	 * @see IInformationControl#dispose()
 	 */
 	public void dispose() {
 		if (fShell != null && !fShell.isDisposed())
 			fShell.dispose();
 		else
 			widgetDisposed(null);
 	}

 	/*
 	 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
 	 * @since 3.0
 	 */
 	public void widgetDisposed(DisposeEvent event) {
 		if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
 			fStatusTextFont.dispose();

 		fShell= null;
 		fText= null;
 		fStatusTextFont= null;
 	}

 	/*
 	 * @see IInformationControl#setSize(int, int)
 	 */
 	public void setSize(int width, int height) {
 		fShell.setSize(width, height);
 	}

 	/*
 	 * @see IInformationControl#setLocation(Point)
 	 */
 	public void setLocation(Point location) {
 		Rectangle trim= fShell.computeTrim(0, 0, 0, 0);
 		Point textLocation= fText.getLocation();
 		location.x += trim.x - textLocation.x;
 		location.y += trim.y - textLocation.y;
 		fShell.setLocation(location);
 	}

 	/*
 	 * @see IInformationControl#setSizeConstraints(int, int)
 	 */
 	public void setSizeConstraints(int maxWidth, int maxHeight) {
 		fMaxWidth= maxWidth;
 		fMaxHeight= maxHeight;
 	}

 	/*
 	 * @see IInformationControl#computeSizeHint()
 	 */
 	public Point computeSizeHint() {
 		return fShell.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 	}

 	/*
 	 * @see org.eclipse.jface.text.IInformationControlExtension3#computeTrim()
 	 * @since 3.0
 	 */
 	public Rectangle computeTrim() {
 		return fShell.computeTrim(0, 0, 0, 0);
 	}

 	/*
 	 * @see org.eclipse.jface.text.IInformationControlExtension3#getBounds()
 	 * @since 3.0
 	 */
 	public Rectangle getBounds() {
 		return fShell.getBounds();
 	}

 	/*
 	 * @see org.eclipse.jface.text.IInformationControlExtension3#restoresLocation()
 	 * @since 3.0
 	 */
 	public boolean restoresLocation() {
 		return false;
 	}

 	/*
 	 * @see org.eclipse.jface.text.IInformationControlExtension3#restoresSize()
 	 * @since 3.0
 	 */
 	public boolean restoresSize() {
 		return false;
 	}

 	/*
 	 * @see IInformationControl#addDisposeListener(DisposeListener)
 	 */
 	public void addDisposeListener(DisposeListener listener) {
 		fShell.addDisposeListener(listener);
 	}

 	/*
 	 * @see IInformationControl#removeDisposeListener(DisposeListener)
 	 */
 	public void removeDisposeListener(DisposeListener listener) {
 		fShell.removeDisposeListener(listener);
 	}

 	/*
 	 * @see IInformationControl#setForegroundColor(Color)
 	 */
 	public void setForegroundColor(Color foreground) {
 		fText.setForeground(foreground);
 	}

 	/*
 	 * @see IInformationControl#setBackgroundColor(Color)
 	 */
 	public void setBackgroundColor(Color background) {
 		fText.setBackground(background);
 	}

 	/*
 	 * @see IInformationControl#isFocusControl()
 	 */
 	public boolean isFocusControl() {
 		return fText.isFocusControl();
 	}

 	/*
 	 * @see IInformationControl#setFocus()
 	 */
 	public void setFocus() {
 		fShell.forceFocus();
 		fText.setFocus();
 	}

 	/*
 	 * @see IInformationControl#addFocusListener(FocusListener)
 	 */
 	public void addFocusListener(FocusListener listener) {
 		fText.addFocusListener(listener);
 	}

 	/*
 	 * @see IInformationControl#removeFocusListener(FocusListener)
 	 */
 	public void removeFocusListener(FocusListener listener) {
 		fText.removeFocusListener(listener);
 	}

 	/*
 	 * @see IInformationControlExtension#hasContents()
 	 */
 	public boolean hasContents() {
 		return fText.getCharCount() > 0;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2004 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Common Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/cpl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/

	package org.eclipse.jface.text;

	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.StyledText;
	import org.eclipse.swt.events.DisposeEvent;
	import org.eclipse.swt.events.DisposeListener;
	import org.eclipse.swt.events.FocusListener;
	import org.eclipse.swt.events.KeyEvent;
	import org.eclipse.swt.events.KeyListener;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.graphics.FontData;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.Rectangle;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;


	/**
	* Text based implementation of <code>IInformationControl</code>.
	* Displays information in a styled text widget. Before displaying, the
	* information set to this information control is processed by an
	* <code>IInformationPresenter</code>.
	*
	* @since 2.0
	*/
	public class DefaultInformationControl implements IInformationControl, IInformationControlExtension, IInformationControlExtension3, DisposeListener {

	/**
	* An information presenter determines the style presentation
	* of information displayed in the default information control.
	* The interface can be implemented by clients.
	*/
	public static interface IInformationPresenter {

	/**
	* Updates the given presentation of the given information and
	* thereby may manipulate the information to be displayed. The manipulation
	* could be the extraction of textual encoded style information etc. Returns the
	* manipulated information.
	*
	* @param display the display of the information control
	* @param hoverInfo the information to be presented
	* @param presentation the presentation to be updated
	* @param maxWidth the maximal width in pixels
	* @param maxHeight the maximal height in pixels
	*
	* @return the manipulated information
	*/
	String updatePresentation(Display display, String hoverInfo, TextPresentation presentation, int maxWidth, int maxHeight);
	}

	/** Border thickness in pixels. */
	private static final int BORDER= 1;

	/** The control's shell */
	private Shell fShell;
	/** The control's text widget */
	private StyledText fText;
	/** The information presenter */
	private IInformationPresenter fPresenter;
	/** A cached text presentation */
	private TextPresentation fPresentation= new TextPresentation();
	/** The control width constraint */
	private int fMaxWidth= -1;
	/** The control height constraint */
	private int fMaxHeight= -1;
	/**
	* The font of the optional status text label.
	*
	* @since 3.0
	*/
	private Font fStatusTextFont;

	/**
	* Creates a default information control with the given shell as parent. The given
	* information presenter is used to process the information to be displayed. The given
	* styles are applied to the created styled text widget.
	*
	* @param parent the parent shell
	* @param shellStyle the additional styles for the shell
	* @param style the additional styles for the styled text widget
	* @param presenter the presenter to be used
	*/
	public DefaultInformationControl(Shell parent, int shellStyle, int style, IInformationPresenter presenter) {
	this(parent, shellStyle, style, presenter, null);
	}

	/**
	* Creates a default information control with the given shell as parent. The given
	* information presenter is used to process the information to be displayed. The given
	* styles are applied to the created styled text widget.
	*
	* @param parent the parent shell
	* @param shellStyle the additional styles for the shell
	* @param style the additional styles for the styled text widget
	* @param presenter the presenter to be used
	* @param statusFieldText the text to be used in the optional status field
	* or <code>null</code> if the status field should be hidden
	* @since 3.0
	*/
	public DefaultInformationControl(Shell parent, int shellStyle, int style, IInformationPresenter presenter, String statusFieldText) {
	GridLayout layout;
	GridData gd;

	fShell= new Shell(parent, SWT.NO_FOCUS \| SWT.ON_TOP \| shellStyle);
	Display display= fShell.getDisplay();
	fShell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));

	Composite composite= fShell;
	layout= new GridLayout(1, false);
	int border= ((shellStyle & SWT.NO_TRIM) == 0) ? 0 : BORDER;
	layout.marginHeight= border;
	layout.marginWidth= border;
	composite.setLayout(layout);
	gd= new GridData(GridData.FILL_BOTH);
	composite.setLayoutData(gd);

	if (statusFieldText != null) {
	composite= new Composite(composite, SWT.NONE);
	layout= new GridLayout(1, false);
	layout.marginHeight= 0;
	layout.marginWidth= 0;
	composite.setLayout(layout);
	gd= new GridData(GridData.FILL_BOTH);
	composite.setLayoutData(gd);
	composite.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
	composite.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
	}

	// Text field
	fText= new StyledText(composite, SWT.MULTI \| SWT.READ_ONLY \| style);
	gd= new GridData(GridData.BEGINNING \| GridData.FILL_BOTH);
	fText.setLayoutData(gd);
	fText.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
	fText.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
	fText.addKeyListener(new KeyListener() {

	public void keyPressed(KeyEvent e) {
	if (e.character == 0x1B) // ESC
	fShell.dispose();
	}

	public void keyReleased(KeyEvent e) {}
	});

	fPresenter= presenter;

	// Status field
	if (statusFieldText != null) {

	// Horizontal separator line
	Label separator= new Label(composite, SWT.SEPARATOR \| SWT.HORIZONTAL \| SWT.LINE_DOT);
	separator.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

	// Status field label
	Label statusField= new Label(composite, SWT.RIGHT);
	statusField.setText(statusFieldText);
	Font font= statusField.getFont();
	FontData[] fontDatas= font.getFontData();
	for (int i= 0; i < fontDatas.length; i++)
	fontDatas[i].setHeight(fontDatas[i].getHeight() * 9 / 10);
	fStatusTextFont= new Font(statusField.getDisplay(), fontDatas);
	statusField.setFont(fStatusTextFont);
	gd= new GridData(GridData.FILL_HORIZONTAL \| GridData.HORIZONTAL_ALIGN_BEGINNING \| GridData.VERTICAL_ALIGN_BEGINNING);
	statusField.setLayoutData(gd);

	statusField.setForeground(display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW));

	statusField.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
	}

	addDisposeListener(this);
	}

	/**
	* Creates a default information control with the given shell as parent. The given
	* information presenter is used to process the information to be displayed. The given
	* styles are applied to the created styled text widget.
	*
	* @param parent the parent shell
	* @param style the additional styles for the styled text widget
	* @param presenter the presenter to be used
	*/
	public DefaultInformationControl(Shell parent,int style, IInformationPresenter presenter) {
	this(parent, SWT.NO_TRIM, style, presenter);
	}

	/**
	* Creates a default information control with the given shell as parent. The given
	* information presenter is used to process the information to be displayed. The given
	* styles are applied to the created styled text widget.
	*
	* @param parent the parent shell
	* @param style the additional styles for the styled text widget
	* @param presenter the presenter to be used
	* @param statusFieldText the text to be used in the optional status field
	* or <code>null</code> if the status field should be hidden
	* @since 3.0
	*/
	public DefaultInformationControl(Shell parent,int style, IInformationPresenter presenter, String statusFieldText) {
	this(parent, SWT.NO_TRIM, style, presenter, statusFieldText);
	}

	/**
	* Creates a default information control with the given shell as parent.
	* No information presenter is used to process the information
	* to be displayed. No additional styles are applied to the styled text widget.
	*
	* @param parent the parent shell
	*/
	public DefaultInformationControl(Shell parent) {
	this(parent, SWT.NONE, null);
	}

	/**
	* Creates a default information control with the given shell as parent. The given
	* information presenter is used to process the information to be displayed.
	* No additional styles are applied to the styled text widget.
	*
	* @param parent the parent shell
	* @param presenter the presenter to be used
	*/
	public DefaultInformationControl(Shell parent, IInformationPresenter presenter) {
	this(parent, SWT.NONE, presenter);
	}

	/*
	* @see IInformationControl#setInformation(String)
	*/
	public void setInformation(String content) {
	if (fPresenter == null) {
	fText.setText(content);
	} else {
	fPresentation.clear();
	content= fPresenter.updatePresentation(fShell.getDisplay(), content, fPresentation, fMaxWidth, fMaxHeight);
	if (content != null) {
	fText.setText(content);
	TextPresentation.applyTextPresentation(fPresentation, fText);
	} else {
	fText.setText(""); //$NON-NLS-1$
	}
	}
	}

	/*
	* @see IInformationControl#setVisible(boolean)
	*/
	public void setVisible(boolean visible) {
	fShell.setVisible(visible);
	}

	/*
	* @see IInformationControl#dispose()
	*/
	public void dispose() {
	if (fShell != null && !fShell.isDisposed())
	fShell.dispose();
	else
	widgetDisposed(null);
	}

	/*
	* @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
	* @since 3.0
	*/
	public void widgetDisposed(DisposeEvent event) {
	if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
	fStatusTextFont.dispose();

	fShell= null;
	fText= null;
	fStatusTextFont= null;
	}

	/*
	* @see IInformationControl#setSize(int, int)
	*/
	public void setSize(int width, int height) {
	fShell.setSize(width, height);
	}

	/*
	* @see IInformationControl#setLocation(Point)
	*/
	public void setLocation(Point location) {
	Rectangle trim= fShell.computeTrim(0, 0, 0, 0);
	Point textLocation= fText.getLocation();
	location.x += trim.x - textLocation.x;
	location.y += trim.y - textLocation.y;
	fShell.setLocation(location);
	}

	/*
	* @see IInformationControl#setSizeConstraints(int, int)
	*/
	public void setSizeConstraints(int maxWidth, int maxHeight) {
	fMaxWidth= maxWidth;
	fMaxHeight= maxHeight;
	}

	/*
	* @see IInformationControl#computeSizeHint()
	*/
	public Point computeSizeHint() {
	return fShell.computeSize(SWT.DEFAULT, SWT.DEFAULT);
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#computeTrim()
	* @since 3.0
	*/
	public Rectangle computeTrim() {
	return fShell.computeTrim(0, 0, 0, 0);
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#getBounds()
	* @since 3.0
	*/
	public Rectangle getBounds() {
	return fShell.getBounds();
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#restoresLocation()
	* @since 3.0
	*/
	public boolean restoresLocation() {
	return false;
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#restoresSize()
	* @since 3.0
	*/
	public boolean restoresSize() {
	return false;
	}

	/*
	* @see IInformationControl#addDisposeListener(DisposeListener)
	*/
	public void addDisposeListener(DisposeListener listener) {
	fShell.addDisposeListener(listener);
	}

	/*
	* @see IInformationControl#removeDisposeListener(DisposeListener)
	*/
	public void removeDisposeListener(DisposeListener listener) {
	fShell.removeDisposeListener(listener);
	}

	/*
	* @see IInformationControl#setForegroundColor(Color)
	*/
	public void setForegroundColor(Color foreground) {
	fText.setForeground(foreground);
	}

	/*
	* @see IInformationControl#setBackgroundColor(Color)
	*/
	public void setBackgroundColor(Color background) {
	fText.setBackground(background);
	}

	/*
	* @see IInformationControl#isFocusControl()
	*/
	public boolean isFocusControl() {
	return fText.isFocusControl();
	}

	/*
	* @see IInformationControl#setFocus()
	*/
	public void setFocus() {
	fShell.forceFocus();
	fText.setFocus();
	}

	/*
	* @see IInformationControl#addFocusListener(FocusListener)
	*/
	public void addFocusListener(FocusListener listener) {
	fText.addFocusListener(listener);
	}

	/*
	* @see IInformationControl#removeFocusListener(FocusListener)
	*/
	public void removeFocusListener(FocusListener listener) {
	fText.removeFocusListener(listener);
	}

	/*
	* @see IInformationControlExtension#hasContents()
	*/
	public boolean hasContents() {
	return fText.getCharCount() > 0;
	}
	}