org.eclipse.photran.ui.vpg/src/org/eclipse/photran/internal/ui/editor_vpg/hover/SourceViewerInformationControl.java - ptp/org.eclipse.photran - Git at Google

 /*******************************************************************************
  * Copyright (c) 2002, 2008 QNX Software Systems 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:
  * QNX Software Systems - Initial API and implementation
  * Anton Leherbauer (Wind River Systems)
  *
  * See org.eclipse.cdt.internal.ui.text.c.hover.SourceViewerInformationControl
  *
  * This class's contructor has been rewritten to fit the purpose of Photran hover tool-tip
  * The rest of the class remains the same
  *
  * Original Contributors:
  * QNX Software Systems and others.
  * Anton Leherbauer (Wind River Systems)
  *
  * For Photran:
  * Jungyoon Lee, Kun Koh, Nam Kim, David Weiner (UIUC) - Modification to run on Photran
  *******************************************************************************/
 package org.eclipse.photran.internal.ui.editor_vpg.hover;

 import org.eclipse.cdt.ui.CUIPlugin;
 import org.eclipse.cdt.ui.PreferenceConstants;
 import org.eclipse.core.runtime.Assert;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.preference.PreferenceConverter;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.text.Document;
 import org.eclipse.jface.text.IDocumentPartitioner;
 import org.eclipse.jface.text.IInformationControl;
 import org.eclipse.jface.text.IInformationControlCreator;
 import org.eclipse.jface.text.IInformationControlExtension;
 import org.eclipse.jface.text.IInformationControlExtension3;
 import org.eclipse.jface.text.IInformationControlExtension5;
 import org.eclipse.jface.text.rules.FastPartitioner;
 import org.eclipse.jface.text.rules.ITokenScanner;
 import org.eclipse.jface.text.rules.RuleBasedPartitionScanner;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.jface.text.source.SourceViewer;
 import org.eclipse.photran.internal.ui.editor.FortranEditor;
 import org.eclipse.photran.internal.ui.editor.FortranKeywordRuleBasedScanner;
 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.GC;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.RGB;
 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.Control;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;


 /**
  * Source viewer based implementation of <code>IInformationControl</code>.
  * Displays information in a source viewer.
  */
 public class SourceViewerInformationControl implements IInformationControl, IInformationControlExtension, IInformationControlExtension3, IInformationControlExtension5, DisposeListener
 {

     /** The control's shell */
     private Shell fShell;
     /** The control's text widget */
     private StyledText fText;
     /** The control's source viewer */
     private SourceViewer fViewer;
     /** The text font (do not dispose!) */
     private Font fTextFont;

     private Document fDocument;
     /**
      * The optional status field.
      *
      * @since 3.0
      */
     private Label fStatusField;
     /**
      * The separator for the optional status field.
      *
      * @since 3.0
      */
     private Label fSeparator;
     /**
      * The font of the optional status text label.
      *
      * @since 3.0
      */
     private Font fStatusTextFont;
     /**
      * The width size constraint.
      * @since 4.0
      */
     private int fMaxWidth= SWT.DEFAULT;
     /**
      * The height size constraint.
      * @since 4.0
      */
     private int fMaxHeight= SWT.DEFAULT;
     /**
      * The orientation of the shell
      * @since 3.4
      */
     private final int fOrientation;

     private Color fBackgroundColor;
     private boolean fIsSystemBackgroundColor= true;

     /**
      * Creates a source viewer information control with the given shell as parent. The given
      * styles are applied to the created styled text widget. The status field will
      * contain the given text or be hidden.
      *
      * This constructor derives from the original SourceViewerInformationControl class that can be found at
      * org.eclipse.cdt.internal.ui.text.c.hover.SourceViewerInformationControl
      *
      * It has been modified to be used in Photran hover tool-tip.
      * @author Jungyoon Lee, Kun Koh, Nam Kim, David Weiner
      *
      * @param parent the parent shell
      * @param isResizable <code>true</code> if resizable
      * @param orientation the orientation
      * @param statusFieldText the text to be used in the optional status field
      *            or <code>null</code> if the status field should be hidden
      */
     public SourceViewerInformationControl(Shell parent, boolean isResizable, int orientation, String statusFieldText)
     {
         Assert.isLegal(orientation == SWT.RIGHT_TO_LEFT || orientation == SWT.LEFT_TO_RIGHT || orientation == SWT.NONE);
         fOrientation= orientation;

         GridLayout layout;
         GridData gd;

         int shellStyle = SWT.TOOL | SWT.ON_TOP | orientation | (isResizable ? SWT.RESIZE : 0);
         int textStyle = isResizable ? SWT.V_SCROLL | SWT.H_SCROLL : SWT.NONE;

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

         initializeColors();

         Composite composite = fShell;
         layout = new GridLayout(1, false);
         layout.marginHeight = 0;
         layout.marginWidth = 0;
         composite.setLayout(layout);
         gd = new GridData(GridData.FILL_HORIZONTAL);
         composite.setLayoutData(gd);

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

         fViewer = new SourceViewer(composite, null, textStyle);
         fViewer.configure(new FortranEditor.FortranSourceViewerConfiguration(null)
         {
             @Override protected ITokenScanner getTokenScanner()
             {
                 // Copied from FortranEditor#getTokenScanner
                 return new FortranKeywordRuleBasedScanner(false, fViewer);
             }
         });

         fDocument = new Document();
         fDocument.set(""); //$NON-NLS-1$
         fViewer.setDocument(fDocument);
         IDocumentPartitioner partitioner = new FastPartitioner(new RuleBasedPartitionScanner(), FortranEditor.PARTITION_TYPES);
         partitioner.connect(fDocument);
         fDocument.setDocumentPartitioner(partitioner);

         fViewer.setEditable(false);
         fViewer.getTextWidget().setFont(JFaceResources.getTextFont());

         fText= fViewer.getTextWidget();
         gd= new GridData(GridData.BEGINNING | GridData.FILL_BOTH);
         fText.setLayoutData(gd);
         fText.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
         fText.setBackground(fBackgroundColor);

         initializeFont();

         fText.addKeyListener(new KeyListener()
         {

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

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

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

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

             // Status field label
             fStatusField = new Label(composite, SWT.RIGHT);
             fStatusField.setText(statusFieldText);
             Font font= fStatusField.getFont();
             FontData[] fontDatas = font.getFontData();
             for (int i= 0; i < fontDatas.length; i++)
                 fontDatas[i].setHeight(fontDatas[i].getHeight() * 9 / 10);
             fStatusTextFont = new Font(fStatusField.getDisplay(), fontDatas);
             fStatusField.setFont(fStatusTextFont);
             GridData gd2 = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING);
             fStatusField.setLayoutData(gd2);

             // Regarding the color see bug 41128
             fStatusField.setForeground(display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW));
             fStatusField.setBackground(fBackgroundColor);
         }

         addDisposeListener(this);

     }

     private void initializeColors()
     {
         RGB bgRGB= getHoverBackgroundColorRGB();
         if (bgRGB != null)
         {
             fBackgroundColor = new Color(fShell.getDisplay(), bgRGB);
             fIsSystemBackgroundColor = false;
         }
         else
         {
             fBackgroundColor = fShell.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND);
             fIsSystemBackgroundColor = true;
         }
     }

     private RGB getHoverBackgroundColorRGB()
     {
         IPreferenceStore store = CUIPlugin.getDefault().getPreferenceStore();
         return store.getBoolean(PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR_SYSTEM_DEFAULT)
             ? null
             : PreferenceConverter.getColor(store, PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR);
     }

     /**
      * Initialize the font to the editor font.
      *
      * @since 4.0
      */
     private void initializeFont()
     {
         fTextFont = JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT);
         StyledText styledText = getViewer().getTextWidget();
         styledText.setFont(fTextFont);
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension2#setInput(java.lang.Object)
      */
     public void setInput(Object input)
     {
         if (input instanceof String)
             setInformation((String)input);
         else
             setInformation(null);
     }

     /**
      * This method takes information from FortranDeclarationHover
      * then stores it into fDocument.
      * @param content a string that will be displayed in a hover tool-tip.
      */
     public void setInformation(String content)
     {
         if (content == null)
             return;

         fDocument.set(content);
         fViewer.refresh();
     }

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

     /**
      * {@inheritDoc}
      * @since 3.0
      */
     public void widgetDisposed(DisposeEvent event)
     {
         if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
             fStatusTextFont.dispose();

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

     /**
      * {@inheritDoc}
      */
     public final void dispose()
     {
         if (!fIsSystemBackgroundColor)
             fBackgroundColor.dispose();
         if (fShell != null && !fShell.isDisposed())
             fShell.dispose();
         else
             widgetDisposed(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)
     {
         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()
     {
         // compute the preferred size
         int x = SWT.DEFAULT;
         int y = SWT.DEFAULT;
         Point size = fShell.computeSize(x, y);
         if (size.x > fMaxWidth)
             x = fMaxWidth;
         if (size.y > fMaxHeight)
             y = fMaxHeight;

         // recompute using the constraints if the preferred size is larger than the constraints
         if (x != SWT.DEFAULT || y != SWT.DEFAULT)
             size = fShell.computeSize(x, y, false);

         return size;
     }

     /*
      * @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 fShell.getDisplay().getActiveShell() == fShell;
     }

     /*
      * @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;
     }

     protected ISourceViewer getViewer()
     {
         return fViewer;
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension3#computeTrim()
      * @since 5.0
      */
     public Rectangle computeTrim()
     {
         Rectangle trim = fShell.computeTrim(0, 0, 0, 0);
         addInternalTrim(trim);
         return trim;
     }

     /**
      * Adds the internal trimmings to the given trim of the shell.
      *
      * @param trim the shell's trim, will be updated
      * @since 5.0
      */
     private void addInternalTrim(Rectangle trim)
     {
         Rectangle textTrim = fText.computeTrim(0, 0, 0, 0);
         trim.x += textTrim.x;
         trim.y += textTrim.y;
         trim.width += textTrim.width;
         trim.height += textTrim.height;

         if (fStatusField != null)
         {
             trim.height += fSeparator.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
             trim.height += fStatusField.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
             trim.height += 1; // verticalSpacing
         }
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension3#getBounds()
      * @since 5.0
      */
     public Rectangle getBounds()
     {
         return fShell.getBounds();
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension3#restoresLocation()
      * @since 5.0
      */
     public boolean restoresLocation()
     {
         return false;
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension3#restoresSize()
      * @since 5.0
      */
     public boolean restoresSize()
     {
         return false;
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension5#getInformationPresenterControlCreator()
      * @since 5.0
      */
     public IInformationControlCreator getInformationPresenterControlCreator()
     {
         return new IInformationControlCreator()
         {
             public IInformationControl createInformationControl(Shell parent)
             {
                 return new SourceViewerInformationControl(parent, true, fOrientation, null);
             }
         };
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension5#containsControl(org.eclipse.swt.widgets.Control)
      * @since 5.0
      */
     public boolean containsControl(Control control)
     {
         do {
             if (control == fShell)
                 return true;
             if (control instanceof Shell)
                 return false;
             control= control.getParent();
         } while (control != null);
         return false;
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension5#isVisible()
      * @since 5.0
      */
     public boolean isVisible()
     {
         return fShell != null && !fShell.isDisposed() && fShell.isVisible();
     }

     /*
      * @see org.eclipse.jface.text.IInformationControlExtension5#computeSizeConstraints(int, int)
      */
     public Point computeSizeConstraints(int widthInChars, int heightInChars)
     {
         GC gc= new GC(fText);
         gc.setFont(fTextFont);
         int width = gc.getFontMetrics().getAverageCharWidth();
         int height = gc.getFontMetrics().getHeight();
         gc.dispose();

         return new Point(widthInChars * width, heightInChars * height);
     }

 }
	/*******************************************************************************
	* Copyright (c) 2002, 2008 QNX Software Systems 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:
	* QNX Software Systems - Initial API and implementation
	* Anton Leherbauer (Wind River Systems)
	*
	* See org.eclipse.cdt.internal.ui.text.c.hover.SourceViewerInformationControl
	*
	* This class's contructor has been rewritten to fit the purpose of Photran hover tool-tip
	* The rest of the class remains the same
	*
	* Original Contributors:
	* QNX Software Systems and others.
	* Anton Leherbauer (Wind River Systems)
	*
	* For Photran:
	* Jungyoon Lee, Kun Koh, Nam Kim, David Weiner (UIUC) - Modification to run on Photran
	*******************************************************************************/
	package org.eclipse.photran.internal.ui.editor_vpg.hover;

	import org.eclipse.cdt.ui.CUIPlugin;
	import org.eclipse.cdt.ui.PreferenceConstants;
	import org.eclipse.core.runtime.Assert;
	import org.eclipse.jface.preference.IPreferenceStore;
	import org.eclipse.jface.preference.PreferenceConverter;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.text.Document;
	import org.eclipse.jface.text.IDocumentPartitioner;
	import org.eclipse.jface.text.IInformationControl;
	import org.eclipse.jface.text.IInformationControlCreator;
	import org.eclipse.jface.text.IInformationControlExtension;
	import org.eclipse.jface.text.IInformationControlExtension3;
	import org.eclipse.jface.text.IInformationControlExtension5;
	import org.eclipse.jface.text.rules.FastPartitioner;
	import org.eclipse.jface.text.rules.ITokenScanner;
	import org.eclipse.jface.text.rules.RuleBasedPartitionScanner;
	import org.eclipse.jface.text.source.ISourceViewer;
	import org.eclipse.jface.text.source.SourceViewer;
	import org.eclipse.photran.internal.ui.editor.FortranEditor;
	import org.eclipse.photran.internal.ui.editor.FortranKeywordRuleBasedScanner;
	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.GC;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.RGB;
	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.Control;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;


	/**
	* Source viewer based implementation of <code>IInformationControl</code>.
	* Displays information in a source viewer.
	*/
	public class SourceViewerInformationControl implements IInformationControl, IInformationControlExtension, IInformationControlExtension3, IInformationControlExtension5, DisposeListener
	{

	/** The control's shell */
	private Shell fShell;
	/** The control's text widget */
	private StyledText fText;
	/** The control's source viewer */
	private SourceViewer fViewer;
	/** The text font (do not dispose!) */
	private Font fTextFont;

	private Document fDocument;
	/**
	* The optional status field.
	*
	* @since 3.0
	*/
	private Label fStatusField;
	/**
	* The separator for the optional status field.
	*
	* @since 3.0
	*/
	private Label fSeparator;
	/**
	* The font of the optional status text label.
	*
	* @since 3.0
	*/
	private Font fStatusTextFont;
	/**
	* The width size constraint.
	* @since 4.0
	*/
	private int fMaxWidth= SWT.DEFAULT;
	/**
	* The height size constraint.
	* @since 4.0
	*/
	private int fMaxHeight= SWT.DEFAULT;
	/**
	* The orientation of the shell
	* @since 3.4
	*/
	private final int fOrientation;

	private Color fBackgroundColor;
	private boolean fIsSystemBackgroundColor= true;

	/**
	* Creates a source viewer information control with the given shell as parent. The given
	* styles are applied to the created styled text widget. The status field will
	* contain the given text or be hidden.
	*
	* This constructor derives from the original SourceViewerInformationControl class that can be found at
	* org.eclipse.cdt.internal.ui.text.c.hover.SourceViewerInformationControl
	*
	* It has been modified to be used in Photran hover tool-tip.
	* @author Jungyoon Lee, Kun Koh, Nam Kim, David Weiner
	*
	* @param parent the parent shell
	* @param isResizable <code>true</code> if resizable
	* @param orientation the orientation
	* @param statusFieldText the text to be used in the optional status field
	* or <code>null</code> if the status field should be hidden
	*/
	public SourceViewerInformationControl(Shell parent, boolean isResizable, int orientation, String statusFieldText)
	{
	Assert.isLegal(orientation == SWT.RIGHT_TO_LEFT \|\| orientation == SWT.LEFT_TO_RIGHT \|\| orientation == SWT.NONE);
	fOrientation= orientation;

	GridLayout layout;
	GridData gd;

	int shellStyle = SWT.TOOL \| SWT.ON_TOP \| orientation \| (isResizable ? SWT.RESIZE : 0);
	int textStyle = isResizable ? SWT.V_SCROLL \| SWT.H_SCROLL : SWT.NONE;

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

	initializeColors();

	Composite composite = fShell;
	layout = new GridLayout(1, false);
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	composite.setLayout(layout);
	gd = new GridData(GridData.FILL_HORIZONTAL);
	composite.setLayoutData(gd);

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

	fViewer = new SourceViewer(composite, null, textStyle);
	fViewer.configure(new FortranEditor.FortranSourceViewerConfiguration(null)
	{
	@Override protected ITokenScanner getTokenScanner()
	{
	// Copied from FortranEditor#getTokenScanner
	return new FortranKeywordRuleBasedScanner(false, fViewer);
	}
	});

	fDocument = new Document();
	fDocument.set(""); //$NON-NLS-1$
	fViewer.setDocument(fDocument);
	IDocumentPartitioner partitioner = new FastPartitioner(new RuleBasedPartitionScanner(), FortranEditor.PARTITION_TYPES);
	partitioner.connect(fDocument);
	fDocument.setDocumentPartitioner(partitioner);

	fViewer.setEditable(false);
	fViewer.getTextWidget().setFont(JFaceResources.getTextFont());

	fText= fViewer.getTextWidget();
	gd= new GridData(GridData.BEGINNING \| GridData.FILL_BOTH);
	fText.setLayoutData(gd);
	fText.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
	fText.setBackground(fBackgroundColor);

	initializeFont();

	fText.addKeyListener(new KeyListener()
	{

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

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

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

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

	// Status field label
	fStatusField = new Label(composite, SWT.RIGHT);
	fStatusField.setText(statusFieldText);
	Font font= fStatusField.getFont();
	FontData[] fontDatas = font.getFontData();
	for (int i= 0; i < fontDatas.length; i++)
	fontDatas[i].setHeight(fontDatas[i].getHeight() * 9 / 10);
	fStatusTextFont = new Font(fStatusField.getDisplay(), fontDatas);
	fStatusField.setFont(fStatusTextFont);
	GridData gd2 = new GridData(GridData.FILL_HORIZONTAL \| GridData.VERTICAL_ALIGN_BEGINNING);
	fStatusField.setLayoutData(gd2);

	// Regarding the color see bug 41128
	fStatusField.setForeground(display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW));
	fStatusField.setBackground(fBackgroundColor);
	}

	addDisposeListener(this);

	}

	private void initializeColors()
	{
	RGB bgRGB= getHoverBackgroundColorRGB();
	if (bgRGB != null)
	{
	fBackgroundColor = new Color(fShell.getDisplay(), bgRGB);
	fIsSystemBackgroundColor = false;
	}
	else
	{
	fBackgroundColor = fShell.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND);
	fIsSystemBackgroundColor = true;
	}
	}

	private RGB getHoverBackgroundColorRGB()
	{
	IPreferenceStore store = CUIPlugin.getDefault().getPreferenceStore();
	return store.getBoolean(PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR_SYSTEM_DEFAULT)
	? null
	: PreferenceConverter.getColor(store, PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR);
	}

	/**
	* Initialize the font to the editor font.
	*
	* @since 4.0
	*/
	private void initializeFont()
	{
	fTextFont = JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT);
	StyledText styledText = getViewer().getTextWidget();
	styledText.setFont(fTextFont);
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension2#setInput(java.lang.Object)
	*/
	public void setInput(Object input)
	{
	if (input instanceof String)
	setInformation((String)input);
	else
	setInformation(null);
	}

	/**
	* This method takes information from FortranDeclarationHover
	* then stores it into fDocument.
	* @param content a string that will be displayed in a hover tool-tip.
	*/
	public void setInformation(String content)
	{
	if (content == null)
	return;

	fDocument.set(content);
	fViewer.refresh();
	}

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

	/**
	* {@inheritDoc}
	* @since 3.0
	*/
	public void widgetDisposed(DisposeEvent event)
	{
	if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
	fStatusTextFont.dispose();

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

	/**
	* {@inheritDoc}
	*/
	public final void dispose()
	{
	if (!fIsSystemBackgroundColor)
	fBackgroundColor.dispose();
	if (fShell != null && !fShell.isDisposed())
	fShell.dispose();
	else
	widgetDisposed(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)
	{
	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()
	{
	// compute the preferred size
	int x = SWT.DEFAULT;
	int y = SWT.DEFAULT;
	Point size = fShell.computeSize(x, y);
	if (size.x > fMaxWidth)
	x = fMaxWidth;
	if (size.y > fMaxHeight)
	y = fMaxHeight;

	// recompute using the constraints if the preferred size is larger than the constraints
	if (x != SWT.DEFAULT \|\| y != SWT.DEFAULT)
	size = fShell.computeSize(x, y, false);

	return size;
	}

	/*
	* @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 fShell.getDisplay().getActiveShell() == fShell;
	}

	/*
	* @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;
	}

	protected ISourceViewer getViewer()
	{
	return fViewer;
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#computeTrim()
	* @since 5.0
	*/
	public Rectangle computeTrim()
	{
	Rectangle trim = fShell.computeTrim(0, 0, 0, 0);
	addInternalTrim(trim);
	return trim;
	}

	/**
	* Adds the internal trimmings to the given trim of the shell.
	*
	* @param trim the shell's trim, will be updated
	* @since 5.0
	*/
	private void addInternalTrim(Rectangle trim)
	{
	Rectangle textTrim = fText.computeTrim(0, 0, 0, 0);
	trim.x += textTrim.x;
	trim.y += textTrim.y;
	trim.width += textTrim.width;
	trim.height += textTrim.height;

	if (fStatusField != null)
	{
	trim.height += fSeparator.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
	trim.height += fStatusField.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
	trim.height += 1; // verticalSpacing
	}
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#getBounds()
	* @since 5.0
	*/
	public Rectangle getBounds()
	{
	return fShell.getBounds();
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#restoresLocation()
	* @since 5.0
	*/
	public boolean restoresLocation()
	{
	return false;
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension3#restoresSize()
	* @since 5.0
	*/
	public boolean restoresSize()
	{
	return false;
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension5#getInformationPresenterControlCreator()
	* @since 5.0
	*/
	public IInformationControlCreator getInformationPresenterControlCreator()
	{
	return new IInformationControlCreator()
	{
	public IInformationControl createInformationControl(Shell parent)
	{
	return new SourceViewerInformationControl(parent, true, fOrientation, null);
	}
	};
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension5#containsControl(org.eclipse.swt.widgets.Control)
	* @since 5.0
	*/
	public boolean containsControl(Control control)
	{
	do {
	if (control == fShell)
	return true;
	if (control instanceof Shell)
	return false;
	control= control.getParent();
	} while (control != null);
	return false;
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension5#isVisible()
	* @since 5.0
	*/
	public boolean isVisible()
	{
	return fShell != null && !fShell.isDisposed() && fShell.isVisible();
	}

	/*
	* @see org.eclipse.jface.text.IInformationControlExtension5#computeSizeConstraints(int, int)
	*/
	public Point computeSizeConstraints(int widthInChars, int heightInChars)
	{
	GC gc= new GC(fText);
	gc.setFont(fTextFont);
	int width = gc.getFontMetrics().getAverageCharWidth();
	int height = gc.getFontMetrics().getHeight();
	gc.dispose();

	return new Point(widthInChars * width, heightInChars * height);
	}

	}