core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/text/hover/SourceViewerInformationControl.java - dltk/org.eclipse.dltk.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2016 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
  *******************************************************************************/
 package org.eclipse.dltk.internal.ui.text.hover;

 import org.eclipse.dltk.core.IDLTKLanguageToolkit;
 import org.eclipse.dltk.internal.ui.editor.ScriptSourceViewer;
 import org.eclipse.dltk.ui.DLTKUILanguageManager;
 import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
 import org.eclipse.dltk.ui.PreferenceConstants;
 import org.eclipse.dltk.ui.text.ScriptTextTools;
 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.IDocument;
 import org.eclipse.jface.text.IInformationControl;
 import org.eclipse.jface.text.IInformationControlExtension;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.jface.text.source.SourceViewer;
 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.RGB;
 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;

 /**
  * Source viewer based implementation of <code>IInformationControl</code>.
  * Displays information in a source viewer.
  *
  * @since 3.0
  */
 public class SourceViewerInformationControl implements IInformationControl,
 		IInformationControlExtension, DisposeListener {

 	/** 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 control's source viewer */
 	private SourceViewer fViewer;
 	/**
 	 * 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 3.2
 	 */
 	private int fMaxWidth = SWT.DEFAULT;
 	/**
 	 * The height size constraint.
 	 *
 	 * @since 3.2
 	 */
 	private int fMaxHeight = SWT.DEFAULT;

 	private Color fBackgroundColor;
 	private boolean fIsSystemBackgroundColor = true;
 	private final IDLTKUILanguageToolkit fToolkit;

 	/**
 	 * 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
 	 */
 	public SourceViewerInformationControl(Shell parent, int shellStyle,
 			int style, IDLTKLanguageToolkit toolkit) {
 		this(parent, shellStyle, style, null, toolkit);
 	}

 	/**
 	 * 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 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 SourceViewerInformationControl(Shell parent, int shellStyle,
 			int style, String statusFieldText, IDLTKLanguageToolkit toolkit) {
 		this.fToolkit = DLTKUILanguageManager.getLanguageToolkit(toolkit);
 		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));

 		initializeColors();

 		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_HORIZONTAL);
 		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(fBackgroundColor);
 		}

 		// Source viewer
 		createViewer(style, composite);
 		fViewer.setEditable(false);

 		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() {

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

 			@Override
 			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_VERTICAL
 					| GridData.FILL_HORIZONTAL
 					| GridData.HORIZONTAL_ALIGN_BEGINNING
 					| 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);
 	}

 	protected void createViewer(int style, Composite composite) {
 		fViewer = new ScriptSourceViewer(composite, null, null, false, style,
 				fToolkit.getPreferenceStore());
 		fViewer.configure(fToolkit.createSourceViewerConfiguration());
 	}

 	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 = fToolkit.getPreferenceStore();
 		return store
 				.getBoolean(PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR_SYSTEM_DEFAULT) ? null
 				: PreferenceConverter
 						.getColor(
 								store,
 								PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR);
 	}

 	/**
 	 * 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
 	 */
 	public SourceViewerInformationControl(Shell parent, int style,
 			IDLTKLanguageToolkit toolkit) {
 		this(parent, SWT.NO_TRIM | SWT.TOOL, style, toolkit);
 	}

 	/**
 	 * 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 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 SourceViewerInformationControl(Shell parent, int style,
 			String statusFieldText, IDLTKLanguageToolkit toolkit) {
 		this(parent, SWT.NO_TRIM | SWT.TOOL, style, statusFieldText, toolkit);
 	}

 	/**
 	 * 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 SourceViewerInformationControl(Shell parent,
 			IDLTKLanguageToolkit toolkit) {
 		this(parent, SWT.NONE, toolkit);
 	}

 	/**
 	 * 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
 	 * @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 SourceViewerInformationControl(Shell parent, String statusFieldText,
 			IDLTKLanguageToolkit toolkit) {
 		this(parent, SWT.NONE, statusFieldText, toolkit);
 	}

 	/**
 	 * Initialize the font to the Java editor font.
 	 *
 	 * @since 3.2
 	 */
 	private void initializeFont() {
 		Font font = JFaceResources
 				.getFont("org.eclipse.jdt.ui.editors.textfont"); //$NON-NLS-1$
 		StyledText styledText = getViewer().getTextWidget();
 		styledText.setFont(font);
 	}

 	public void setInput(Object input) {
 		if (input instanceof String)
 			setInformation((String) input);
 		else
 			setInformation(null);
 	}

 	@Override
 	public void setInformation(String content) {
 		if (content == null) {
 			fViewer.setInput(null);
 			return;
 		}

 		IDocument doc = new Document(content);
 		ScriptTextTools textTools = fToolkit.getTextTools();
 		if (textTools != null) {
 			textTools.setupDocumentPartitioner(doc, fToolkit
 					.getPartitioningId());
 		}
 		fViewer.setInput(doc);
 	}

 	@Override
 	public void setVisible(boolean visible) {
 		fShell.setVisible(visible);
 	}

 	@Override
 	public void widgetDisposed(DisposeEvent event) {
 		if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
 			fStatusTextFont.dispose();

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

 	@Override
 	public final void dispose() {
 		if (!fIsSystemBackgroundColor)
 			fBackgroundColor.dispose();
 		if (fShell != null && !fShell.isDisposed())
 			fShell.dispose();
 		else
 			widgetDisposed(null);
 	}

 	@Override
 	public void setSize(int width, int height) {

 		if (fStatusField != null) {
 			GridData gd = (GridData) fViewer.getTextWidget().getLayoutData();
 			Point statusSize = fStatusField.computeSize(SWT.DEFAULT,
 					SWT.DEFAULT, true);
 			Point separatorSize = fSeparator.computeSize(SWT.DEFAULT,
 					SWT.DEFAULT, true);
 			gd.heightHint = height - statusSize.y - separatorSize.y;
 		}
 		fShell.setSize(width, height);

 		if (fStatusField != null)
 			fShell.pack(true);
 	}

 	@Override
 	public void setLocation(Point location) {
 		fShell.setLocation(location);
 	}

 	@Override
 	public void setSizeConstraints(int maxWidth, int maxHeight) {
 		fMaxWidth = maxWidth;
 		fMaxHeight = maxHeight;
 	}

 	@Override
 	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;
 	}

 	@Override
 	public void addDisposeListener(DisposeListener listener) {
 		fShell.addDisposeListener(listener);
 	}

 	@Override
 	public void removeDisposeListener(DisposeListener listener) {
 		fShell.removeDisposeListener(listener);
 	}

 	@Override
 	public void setForegroundColor(Color foreground) {
 		fText.setForeground(foreground);
 	}

 	@Override
 	public void setBackgroundColor(Color background) {
 		fText.setBackground(background);
 	}

 	@Override
 	public boolean isFocusControl() {
 		return fText.isFocusControl();
 	}

 	@Override
 	public void setFocus() {
 		fShell.forceFocus();
 		fText.setFocus();
 	}

 	@Override
 	public void addFocusListener(FocusListener listener) {
 		fText.addFocusListener(listener);
 	}

 	@Override
 	public void removeFocusListener(FocusListener listener) {
 		fText.removeFocusListener(listener);
 	}

 	@Override
 	public boolean hasContents() {
 		return fText.getCharCount() > 0;
 	}

 	protected ISourceViewer getViewer() {
 		return fViewer;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2016 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
	*******************************************************************************/
	package org.eclipse.dltk.internal.ui.text.hover;

	import org.eclipse.dltk.core.IDLTKLanguageToolkit;
	import org.eclipse.dltk.internal.ui.editor.ScriptSourceViewer;
	import org.eclipse.dltk.ui.DLTKUILanguageManager;
	import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
	import org.eclipse.dltk.ui.PreferenceConstants;
	import org.eclipse.dltk.ui.text.ScriptTextTools;
	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.IDocument;
	import org.eclipse.jface.text.IInformationControl;
	import org.eclipse.jface.text.IInformationControlExtension;
	import org.eclipse.jface.text.source.ISourceViewer;
	import org.eclipse.jface.text.source.SourceViewer;
	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.RGB;
	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;

	/**
	* Source viewer based implementation of <code>IInformationControl</code>.
	* Displays information in a source viewer.
	*
	* @since 3.0
	*/
	public class SourceViewerInformationControl implements IInformationControl,
	IInformationControlExtension, DisposeListener {

	/** 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 control's source viewer */
	private SourceViewer fViewer;
	/**
	* 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 3.2
	*/
	private int fMaxWidth = SWT.DEFAULT;
	/**
	* The height size constraint.
	*
	* @since 3.2
	*/
	private int fMaxHeight = SWT.DEFAULT;

	private Color fBackgroundColor;
	private boolean fIsSystemBackgroundColor = true;
	private final IDLTKUILanguageToolkit fToolkit;

	/**
	* 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
	*/
	public SourceViewerInformationControl(Shell parent, int shellStyle,
	int style, IDLTKLanguageToolkit toolkit) {
	this(parent, shellStyle, style, null, toolkit);
	}

	/**
	* 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 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 SourceViewerInformationControl(Shell parent, int shellStyle,
	int style, String statusFieldText, IDLTKLanguageToolkit toolkit) {
	this.fToolkit = DLTKUILanguageManager.getLanguageToolkit(toolkit);
	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));

	initializeColors();

	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_HORIZONTAL);
	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(fBackgroundColor);
	}

	// Source viewer
	createViewer(style, composite);
	fViewer.setEditable(false);

	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() {

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

	@Override
	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_VERTICAL
	\| GridData.FILL_HORIZONTAL
	\| GridData.HORIZONTAL_ALIGN_BEGINNING
	\| 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);
	}

	protected void createViewer(int style, Composite composite) {
	fViewer = new ScriptSourceViewer(composite, null, null, false, style,
	fToolkit.getPreferenceStore());
	fViewer.configure(fToolkit.createSourceViewerConfiguration());
	}

	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 = fToolkit.getPreferenceStore();
	return store
	.getBoolean(PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR_SYSTEM_DEFAULT) ? null
	: PreferenceConverter
	.getColor(
	store,
	PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR);
	}

	/**
	* 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
	*/
	public SourceViewerInformationControl(Shell parent, int style,
	IDLTKLanguageToolkit toolkit) {
	this(parent, SWT.NO_TRIM \| SWT.TOOL, style, toolkit);
	}

	/**
	* 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 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 SourceViewerInformationControl(Shell parent, int style,
	String statusFieldText, IDLTKLanguageToolkit toolkit) {
	this(parent, SWT.NO_TRIM \| SWT.TOOL, style, statusFieldText, toolkit);
	}

	/**
	* 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 SourceViewerInformationControl(Shell parent,
	IDLTKLanguageToolkit toolkit) {
	this(parent, SWT.NONE, toolkit);
	}

	/**
	* 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
	* @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 SourceViewerInformationControl(Shell parent, String statusFieldText,
	IDLTKLanguageToolkit toolkit) {
	this(parent, SWT.NONE, statusFieldText, toolkit);
	}

	/**
	* Initialize the font to the Java editor font.
	*
	* @since 3.2
	*/
	private void initializeFont() {
	Font font = JFaceResources
	.getFont("org.eclipse.jdt.ui.editors.textfont"); //$NON-NLS-1$
	StyledText styledText = getViewer().getTextWidget();
	styledText.setFont(font);
	}

	public void setInput(Object input) {
	if (input instanceof String)
	setInformation((String) input);
	else
	setInformation(null);
	}

	@Override
	public void setInformation(String content) {
	if (content == null) {
	fViewer.setInput(null);
	return;
	}

	IDocument doc = new Document(content);
	ScriptTextTools textTools = fToolkit.getTextTools();
	if (textTools != null) {
	textTools.setupDocumentPartitioner(doc, fToolkit
	.getPartitioningId());
	}
	fViewer.setInput(doc);
	}

	@Override
	public void setVisible(boolean visible) {
	fShell.setVisible(visible);
	}

	@Override
	public void widgetDisposed(DisposeEvent event) {
	if (fStatusTextFont != null && !fStatusTextFont.isDisposed())
	fStatusTextFont.dispose();

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

	@Override
	public final void dispose() {
	if (!fIsSystemBackgroundColor)
	fBackgroundColor.dispose();
	if (fShell != null && !fShell.isDisposed())
	fShell.dispose();
	else
	widgetDisposed(null);
	}

	@Override
	public void setSize(int width, int height) {

	if (fStatusField != null) {
	GridData gd = (GridData) fViewer.getTextWidget().getLayoutData();
	Point statusSize = fStatusField.computeSize(SWT.DEFAULT,
	SWT.DEFAULT, true);
	Point separatorSize = fSeparator.computeSize(SWT.DEFAULT,
	SWT.DEFAULT, true);
	gd.heightHint = height - statusSize.y - separatorSize.y;
	}
	fShell.setSize(width, height);

	if (fStatusField != null)
	fShell.pack(true);
	}

	@Override
	public void setLocation(Point location) {
	fShell.setLocation(location);
	}

	@Override
	public void setSizeConstraints(int maxWidth, int maxHeight) {
	fMaxWidth = maxWidth;
	fMaxHeight = maxHeight;
	}

	@Override
	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;
	}

	@Override
	public void addDisposeListener(DisposeListener listener) {
	fShell.addDisposeListener(listener);
	}

	@Override
	public void removeDisposeListener(DisposeListener listener) {
	fShell.removeDisposeListener(listener);
	}

	@Override
	public void setForegroundColor(Color foreground) {
	fText.setForeground(foreground);
	}

	@Override
	public void setBackgroundColor(Color background) {
	fText.setBackground(background);
	}

	@Override
	public boolean isFocusControl() {
	return fText.isFocusControl();
	}

	@Override
	public void setFocus() {
	fShell.forceFocus();
	fText.setFocus();
	}

	@Override
	public void addFocusListener(FocusListener listener) {
	fText.addFocusListener(listener);
	}

	@Override
	public void removeFocusListener(FocusListener listener) {
	fText.removeFocusListener(listener);
	}

	@Override
	public boolean hasContents() {
	return fText.getCharCount() > 0;
	}

	protected ISourceViewer getViewer() {
	return fViewer;
	}
	}