org.eclipse.help.ui/src/org/eclipse/help/ui/internal/views/BrowserPart.java - platform/eclipse.platform.ua - 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.help.ui.internal.views;

 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.StringTokenizer;

 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.preferences.IEclipsePreferences;
 import org.eclipse.core.runtime.preferences.IScopeContext;
 import org.eclipse.core.runtime.preferences.InstanceScope;
 import org.eclipse.help.internal.base.BaseHelpSystem;
 import org.eclipse.help.internal.base.HelpBasePlugin;
 import org.eclipse.help.internal.base.util.LinkUtil;
 import org.eclipse.help.internal.util.URLCoder;
 import org.eclipse.help.ui.internal.HelpUIPlugin;
 import org.eclipse.help.ui.internal.HelpUIResources;
 import org.eclipse.help.ui.internal.IHelpUIConstants;
 import org.eclipse.help.ui.internal.Messages;
 import org.eclipse.help.ui.internal.util.FontUtils;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.action.IStatusLineManager;
 import org.eclipse.jface.action.IToolBarManager;
 import org.eclipse.jface.action.Separator;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.browser.Browser;
 import org.eclipse.swt.browser.LocationEvent;
 import org.eclipse.swt.browser.LocationListener;
 import org.eclipse.swt.browser.ProgressEvent;
 import org.eclipse.swt.browser.ProgressListener;
 import org.eclipse.swt.custom.BusyIndicator;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.actions.ActionFactory;
 import org.eclipse.ui.forms.AbstractFormPart;
 import org.eclipse.ui.forms.widgets.FormToolkit;
 import org.osgi.service.prefs.BackingStoreException;

 public class BrowserPart extends AbstractFormPart implements IHelpPart {
 	private final static String QUERY = "BrowserPartQuery:"; //$NON-NLS-1$
 	private final static String HIGHLIGHT_ON = "highlight-on"; //$NON-NLS-1$
 	private final static String HELP_VIEW_SCALE = "help_view_scale"; //$NON-NLS-1$
     private final static String EMPTY_PAGE = "<html><head></head><body></body></html>"; //$NON-NLS-1$

 	private ReusableHelpPart parent;

 	private Browser browser;

 	private String id;

 	private int lastProgress = -1;

 	private static final int SCALE_MAX = 250;

 	private static final int SCALE_MIN = 50;

 	private static final int SCALE_INCREMENT = 10;

 	private int fontScalePercentage = 100;

 	private String url;

 	private Action showExternalAction;

 	private Action syncTocAction;

 	private Action highlightAction;

 	private Action bookmarkAction;

 	private Action printAction;

 	private Action magnifyAction;

 	private Action reduceAction;

 	private String statusURL;

 	private String title;

 	public BrowserPart(final Composite parent, FormToolkit toolkit,
 			final IToolBarManager tbm, IMenuManager menuManager) {
 		browser = new Browser(parent, SWT.NULL);
 		browser.addLocationListener(new LocationListener() {

 			@Override
 			public void changing(LocationEvent event) {
 				if (redirectLink(event.location))
 					event.doit = false;
 				if (!event.doit && event.location != null
 						&& event.location.startsWith("https://")) { //$NON-NLS-1$
 					try {
 						BaseHelpSystem.getHelpBrowser(true).displayURL(
 								event.location);
 					} catch (Exception exc) {
 					}
 				}
 			}

 			@Override
 			public void changed(LocationEvent event) {
 				String url = event.location;
 				boolean isResult = url.indexOf("resultof")!=-1; //$NON-NLS-1$
 				BrowserPart.this.parent.browserChanged(url);
 				BrowserPart.this.url = url;
 				updateSyncTocAction();
 				BrowserPart.this.highlightAction.setEnabled(isResult);
 			}
 		});
 		browser.addProgressListener(new ProgressListener() {

 			@Override
 			public void changed(ProgressEvent e) {
 				if (e.current == e.total)
 					return;
 				IStatusLineManager slm = BrowserPart.this.parent
 						.getStatusLineManager();
 				IProgressMonitor monitor = slm != null ? slm
 						.getProgressMonitor() : null;
 				if (lastProgress == -1) {
 					lastProgress = 0;
 					if (monitor != null) {
 						monitor.beginTask("", e.total); //$NON-NLS-1$
 						slm.setCancelEnabled(true);
 					}
 				} else if (monitor != null && monitor.isCanceled()) {
 					browser.stop();
 					return;
 				}
 				if (monitor != null)
 					monitor.worked(e.current - lastProgress);
 				lastProgress = e.current;
 			}

 			@Override
 			public void completed(ProgressEvent e) {
 				IStatusLineManager slm = BrowserPart.this.parent
 						.getStatusLineManager();
 				IProgressMonitor monitor = slm != null ? slm
 						.getProgressMonitor() : null;
 				if (monitor != null) {
 					slm.setCancelEnabled(false);
 					monitor.done();
 				}
 				lastProgress = -1;
 				if (fontScalePercentage != 100) {
 				    rescale();
 				}
 				String value = executeQuery("document.title"); //$NON-NLS-1$
 				BrowserPart.this.title = value != null ? value : "N/A"; //$NON-NLS-1$
 			}
 		});
 		browser.addStatusTextListener(event -> {
 			if (processQuery(event.text))
 				return;
 			IStatusLineManager statusLine = BrowserPart.this.parent.getStatusLineManager();
 			if (statusLine != null)
 				statusLine.setMessage(event.text);
 			if (event.text.indexOf("://") != -1) //$NON-NLS-1$
 				statusURL = event.text;
 		});
 		browser.addOpenWindowListener(event -> {
 			if (statusURL != null) {
 				try {
 					String relativeURL = BaseHelpSystem.unresolve(new URL(statusURL));
 					if (BrowserPart.this.parent.isHelpResource(relativeURL)) {
 						BrowserPart.this.parent.showExternalURL(relativeURL);
 						event.required = true;
 					}
 				} catch (MalformedURLException e) {
 					HelpUIPlugin.logError("Malformed URL: " + statusURL, e); //$NON-NLS-1$
 				}
 			}
 		});
 		contributeToToolBar(tbm);
 		contributeToMenu(menuManager);
 	}

 	private String executeQuery(String domValue) {
 		return (String)browser.evaluate("return " + domValue + ';'); //$NON-NLS-1$
 	}

 	private boolean processQuery(String text) {
 		if (text.startsWith(QUERY)) {
 			browser.setData("query", text.substring(QUERY.length())); //$NON-NLS-1$
 			return true;
 		}
 		return false;
 	}

 	private void contributeToToolBar(IToolBarManager tbm) {
 		boolean highlight = Platform.getPreferencesService().getBoolean(HelpBasePlugin.PLUGIN_ID, HIGHLIGHT_ON, true, null);
 		showExternalAction = new Action() {

 			@Override
 			public void run() {
 				BusyIndicator.showWhile(browser.getDisplay(), () -> {
 					try {
 						parent.showExternalURL(BaseHelpSystem.unresolve(new URL(url)));
 					} catch (MalformedURLException e) {
 						HelpUIPlugin.logError("Malformed URL: " + statusURL, e); //$NON-NLS-1$
 					}
 				});
 			}
 		};
 		showExternalAction
 				.setToolTipText(Messages.BrowserPart_showExternalTooltip);
 		showExternalAction.setImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_NW));
 		syncTocAction = new Action() {

 			@Override
 			public void run() {
 				doSyncToc();
 			}
 		};
 		syncTocAction.setToolTipText(Messages.BrowserPart_syncTocTooltip);
 		syncTocAction.setImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_SYNC_TOC));
 		syncTocAction.setEnabled(false);
 		bookmarkAction = new Action() {

 			@Override
 			public void run() {
 				String href = LinkUtil.stripParams(BaseHelpSystem.unresolve(url));
 				BaseHelpSystem.getBookmarkManager().addBookmark(href, title);
 			}
 		};
 		bookmarkAction.setToolTipText(Messages.BrowserPart_bookmarkTooltip);
 		bookmarkAction.setImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_ADD_BOOKMARK));

 		highlightAction = new Action() {

 			@Override
 			public void run() {
 				IScopeContext instanceScope = InstanceScope.INSTANCE;
 				IEclipsePreferences prefs = instanceScope.getNode(HelpBasePlugin.PLUGIN_ID);
 				prefs.putBoolean(HIGHLIGHT_ON, highlightAction.isChecked());
 				if (browser.getUrl().indexOf("resultof")!=-1) browser.execute("setHighlight(" +highlightAction.isChecked()+");"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 			}
 		};
 		highlightAction.setChecked(highlight);
 		highlightAction.setToolTipText(Messages.BrowserPart_highlightTooltip);
 		highlightAction.setImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_HIGHLIGHT));

 		printAction = new Action(ActionFactory.PRINT.getId()) {

 			@Override
 			public void run() {
 				doPrint();
 			}
 		};
 		printAction.setImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_HELP_PRINT));
 		printAction.setToolTipText(Messages.BrowserPart_printTooltip);

 		tbm.insertBefore("back", showExternalAction); //$NON-NLS-1$
 		tbm.insertBefore("back", syncTocAction); //$NON-NLS-1$
 		tbm.insertBefore("back", printAction); //$NON-NLS-1$
 		tbm.insertBefore("back", bookmarkAction); //$NON-NLS-1$
 		tbm.insertBefore("back", highlightAction); //$NON-NLS-1$
 		tbm.insertBefore("back", new Separator()); //$NON-NLS-1$
 		enableButtons();
 	}

 	private void contributeToMenu(IMenuManager menuManager) {
 		if (FontUtils.canRescaleHelpView()) {
 			fontScalePercentage = Platform.getPreferencesService().getInt(HelpBasePlugin.PLUGIN_ID,
 					HELP_VIEW_SCALE, 100, null);
 			if (menuManager != null) {
 			    addMenuActions(menuManager);
 			}
 		}
 	}

 	private void addMenuActions(IMenuManager menuManager) {
 		magnifyAction = new Action() {

 			@Override
 			public void run() {
 				doMagnify(SCALE_INCREMENT);
 			}
 		};
 		magnifyAction.setToolTipText(Messages.BrowserPart_magnifyTooltip);
 		magnifyAction.setText(Messages.BrowserPart_magnifyTooltip);
 		magnifyAction.setImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_MAGNIFY));
 		magnifyAction.setDisabledImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_D_MAGNIFY));

 		reduceAction = new Action() {

 			@Override
 			public void run() {
 				doMagnify(-SCALE_INCREMENT);
 			}
 		};
 		reduceAction.setToolTipText(Messages.BrowserPart_reduceTooltip);
 		reduceAction.setText(Messages.BrowserPart_reduceTooltip);
 		reduceAction
 				.setImageDescriptor(HelpUIResources.getImageDescriptor(IHelpUIConstants.IMAGE_REDUCE));
 		reduceAction.setDisabledImageDescriptor(HelpUIResources
 				.getImageDescriptor(IHelpUIConstants.IMAGE_D_REDUCE));
 		menuManager.add(new Separator());
 		menuManager.add(reduceAction);
 		menuManager.add(magnifyAction);
 	}

 	@Override
 	public void init(ReusableHelpPart parent, String id, IMemento memento) {
 		this.parent = parent;
 		this.id = id;
 		if (memento != null) {
 			String href = memento.getString("BrowserPart.url"); //$NON-NLS-1$
 			if (href != null)
 				showURL(BaseHelpSystem.resolve(href, "/help/ntopic").toString()); //$NON-NLS-1$
 		}
 	}

 	@Override
 	public String getId() {
 		return id;
 	}

 	@Override
 	public Control getControl() {
 		return browser;
 	}

 	@Override
 	public void setVisible(boolean visible) {
 		if (browser != null) {
 			browser.setVisible(visible);
 		}
 	}

 	@Override
 	public void setFocus() {
 		if (browser != null)
 			browser.setFocus();
 	}

 	public void showURL(String url) {
 		if (browser != null && url != null) {
 			browser.setUrl(url);
 		}
 	}

 	public void clearBrowser() {
 		if (browser != null) {
 			browser.setText(EMPTY_PAGE);
 		}
 	}

 	@Override
 	public void stop() {
 		if (browser != null && !browser.isDisposed()) {
 			browser.stop();
 		}
 	}

 	private void doPrint() {
 		browser.execute("window.print();"); //$NON-NLS-1$
 	}

 	private void doSyncToc() {
 		String href = BaseHelpSystem.unresolve(this.url);
 		int ix = href.indexOf("?resultof="); //$NON-NLS-1$
 		if (ix >= 0) {
 			href = href.substring(0, ix);
 		}
 		parent.showPage(IHelpUIConstants.HV_ALL_TOPICS_PAGE);
 		AllTopicsPart part = (AllTopicsPart) parent
 				.findPart(IHelpUIConstants.HV_TOPIC_TREE);
 		if (part != null) {
 			part.selectReveal(href);
 		}
 	}

 	private void updateSyncTocAction() {
 		String href = BaseHelpSystem.unresolve(this.url);
 		syncTocAction.setEnabled(parent.isHelpResource(href));
 	}

 	private boolean redirectLink(final String url) {
 		if (url.indexOf("/topic/") != -1) { //$NON-NLS-1$
 			if (url.indexOf("noframes") == -1) { //$NON-NLS-1$
 				return true;
 			}
 		} else if (url.indexOf("livehelp/?pluginID=")>0) { //$NON-NLS-1$
 			processLiveAction(url);
 			return true;
 		} else if (url.indexOf("helpview:") == 0) { //$NON-NLS-1$
 			HelpviewProtocol.handleProtocolCall(url, parent);
 			return true;
 		}
 		return false;
 	}

 	private void processLiveAction(String url) {
 		if (!Platform.getPreferencesService().getBoolean(HelpBasePlugin.PLUGIN_ID, "activeHelp", false, null)) { //$NON-NLS-1$
 			return;
 		}

 		String query = null;
 		try {
 			URL u = new URL(url);
 			query = u.getQuery();
 		} catch (MalformedURLException mue) {
 		}
 		if (query == null)
 			return;
 		StringTokenizer st = new StringTokenizer(query, "=&"); //$NON-NLS-1$
 		if (st.countTokens() < 6) {
 			return;
 		}
 		st.nextToken();
 		String pluginId = URLCoder.decode(st.nextToken());
 		st.nextToken();
 		String className = URLCoder.decode(st.nextToken());
 		st.nextToken();
 		String arg = URLCoder.decode(st.nextToken());
 		if (pluginId == null || className == null || arg == null)
 			return;
 		BaseHelpSystem.runLiveHelp(pluginId, className, arg);
 	}

 	@Override
 	public boolean fillContextMenu(IMenuManager manager) {
 		return false;
 	}

 	@Override
 	public boolean hasFocusControl(Control control) {
 		return browser.equals(control);
 	}

 	@Override
 	public IAction getGlobalAction(String id) {
 		if (id.equals(ActionFactory.PRINT.getId()))
 			return printAction;
 		return null;
 	}

 	private void enableButtons() {
 		if (magnifyAction != null) {
 		    magnifyAction.setEnabled(fontScalePercentage < SCALE_MAX);
 	        reduceAction.setEnabled(fontScalePercentage > SCALE_MIN);
 		}
 	}

 	private void doMagnify(int percent) {
 		fontScalePercentage += percent;
 		IScopeContext instanceScope = InstanceScope.INSTANCE;
 		IEclipsePreferences prefs = instanceScope.getNode(HelpBasePlugin.PLUGIN_ID);
 		prefs.putInt(HELP_VIEW_SCALE, fontScalePercentage);
 		try {
 			prefs.flush();
 		} catch (BackingStoreException e) {
 		}
 		rescale();
 	}

 	public void rescale() {
 		browser.execute(FontUtils.getRescaleScript(fontScalePercentage));
 		enableButtons();
 	}

 	@Override
 	public void toggleRoleFilter() {
 	}

 	@Override
 	public void refilter() {
 		showURL(this.url);
 	}

 	@Override
 	public void saveState(IMemento memento) {
 		if (url != null) {
 			String href = BaseHelpSystem.unresolve(url);
 			memento.putString("BrowserPart.url", href); //$NON-NLS-1$
 		}
 	}
 }
	/*******************************************************************************
	* 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.help.ui.internal.views;

	import java.net.MalformedURLException;
	import java.net.URL;
	import java.util.StringTokenizer;

	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.core.runtime.preferences.IEclipsePreferences;
	import org.eclipse.core.runtime.preferences.IScopeContext;
	import org.eclipse.core.runtime.preferences.InstanceScope;
	import org.eclipse.help.internal.base.BaseHelpSystem;
	import org.eclipse.help.internal.base.HelpBasePlugin;
	import org.eclipse.help.internal.base.util.LinkUtil;
	import org.eclipse.help.internal.util.URLCoder;
	import org.eclipse.help.ui.internal.HelpUIPlugin;
	import org.eclipse.help.ui.internal.HelpUIResources;
	import org.eclipse.help.ui.internal.IHelpUIConstants;
	import org.eclipse.help.ui.internal.Messages;
	import org.eclipse.help.ui.internal.util.FontUtils;
	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.IAction;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.action.IStatusLineManager;
	import org.eclipse.jface.action.IToolBarManager;
	import org.eclipse.jface.action.Separator;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.browser.Browser;
	import org.eclipse.swt.browser.LocationEvent;
	import org.eclipse.swt.browser.LocationListener;
	import org.eclipse.swt.browser.ProgressEvent;
	import org.eclipse.swt.browser.ProgressListener;
	import org.eclipse.swt.custom.BusyIndicator;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.ui.IMemento;
	import org.eclipse.ui.actions.ActionFactory;
	import org.eclipse.ui.forms.AbstractFormPart;
	import org.eclipse.ui.forms.widgets.FormToolkit;
	import org.osgi.service.prefs.BackingStoreException;

	public class BrowserPart extends AbstractFormPart implements IHelpPart {
	private final static String QUERY = "BrowserPartQuery:"; //$NON-NLS-1$
	private final static String HIGHLIGHT_ON = "highlight-on"; //$NON-NLS-1$
	private final static String HELP_VIEW_SCALE = "help_view_scale"; //$NON-NLS-1$
	private final static String EMPTY_PAGE = "<html><head></head><body></body></html>"; //$NON-NLS-1$

	private ReusableHelpPart parent;

	private Browser browser;

	private String id;

	private int lastProgress = -1;

	private static final int SCALE_MAX = 250;

	private static final int SCALE_MIN = 50;

	private static final int SCALE_INCREMENT = 10;

	private int fontScalePercentage = 100;

	private String url;

	private Action showExternalAction;

	private Action syncTocAction;

	private Action highlightAction;

	private Action bookmarkAction;

	private Action printAction;

	private Action magnifyAction;

	private Action reduceAction;

	private String statusURL;

	private String title;

	public BrowserPart(final Composite parent, FormToolkit toolkit,
	final IToolBarManager tbm, IMenuManager menuManager) {
	browser = new Browser(parent, SWT.NULL);
	browser.addLocationListener(new LocationListener() {

	@Override
	public void changing(LocationEvent event) {
	if (redirectLink(event.location))
	event.doit = false;
	if (!event.doit && event.location != null
	&& event.location.startsWith("https://")) { //$NON-NLS-1$
	try {
	BaseHelpSystem.getHelpBrowser(true).displayURL(
	event.location);
	} catch (Exception exc) {
	}
	}
	}

	@Override
	public void changed(LocationEvent event) {
	String url = event.location;
	boolean isResult = url.indexOf("resultof")!=-1; //$NON-NLS-1$
	BrowserPart.this.parent.browserChanged(url);
	BrowserPart.this.url = url;
	updateSyncTocAction();
	BrowserPart.this.highlightAction.setEnabled(isResult);
	}
	});
	browser.addProgressListener(new ProgressListener() {

	@Override
	public void changed(ProgressEvent e) {
	if (e.current == e.total)
	return;
	IStatusLineManager slm = BrowserPart.this.parent
	.getStatusLineManager();
	IProgressMonitor monitor = slm != null ? slm
	.getProgressMonitor() : null;
	if (lastProgress == -1) {
	lastProgress = 0;
	if (monitor != null) {
	monitor.beginTask("", e.total); //$NON-NLS-1$
	slm.setCancelEnabled(true);
	}
	} else if (monitor != null && monitor.isCanceled()) {
	browser.stop();
	return;
	}
	if (monitor != null)
	monitor.worked(e.current - lastProgress);
	lastProgress = e.current;
	}

	@Override
	public void completed(ProgressEvent e) {
	IStatusLineManager slm = BrowserPart.this.parent
	.getStatusLineManager();
	IProgressMonitor monitor = slm != null ? slm
	.getProgressMonitor() : null;
	if (monitor != null) {
	slm.setCancelEnabled(false);
	monitor.done();
	}
	lastProgress = -1;
	if (fontScalePercentage != 100) {
	rescale();
	}
	String value = executeQuery("document.title"); //$NON-NLS-1$
	BrowserPart.this.title = value != null ? value : "N/A"; //$NON-NLS-1$
	}
	});
	browser.addStatusTextListener(event -> {
	if (processQuery(event.text))
	return;
	IStatusLineManager statusLine = BrowserPart.this.parent.getStatusLineManager();
	if (statusLine != null)
	statusLine.setMessage(event.text);
	if (event.text.indexOf("://") != -1) //$NON-NLS-1$
	statusURL = event.text;
	});
	browser.addOpenWindowListener(event -> {
	if (statusURL != null) {
	try {
	String relativeURL = BaseHelpSystem.unresolve(new URL(statusURL));
	if (BrowserPart.this.parent.isHelpResource(relativeURL)) {
	BrowserPart.this.parent.showExternalURL(relativeURL);
	event.required = true;
	}
	} catch (MalformedURLException e) {
	HelpUIPlugin.logError("Malformed URL: " + statusURL, e); //$NON-NLS-1$
	}
	}
	});
	contributeToToolBar(tbm);
	contributeToMenu(menuManager);
	}

	private String executeQuery(String domValue) {
	return (String)browser.evaluate("return " + domValue + ';'); //$NON-NLS-1$
	}

	private boolean processQuery(String text) {
	if (text.startsWith(QUERY)) {
	browser.setData("query", text.substring(QUERY.length())); //$NON-NLS-1$
	return true;
	}
	return false;
	}

	private void contributeToToolBar(IToolBarManager tbm) {
	boolean highlight = Platform.getPreferencesService().getBoolean(HelpBasePlugin.PLUGIN_ID, HIGHLIGHT_ON, true, null);
	showExternalAction = new Action() {

	@Override
	public void run() {
	BusyIndicator.showWhile(browser.getDisplay(), () -> {
	try {
	parent.showExternalURL(BaseHelpSystem.unresolve(new URL(url)));
	} catch (MalformedURLException e) {
	HelpUIPlugin.logError("Malformed URL: " + statusURL, e); //$NON-NLS-1$
	}
	});
	}
	};
	showExternalAction
	.setToolTipText(Messages.BrowserPart_showExternalTooltip);
	showExternalAction.setImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_NW));
	syncTocAction = new Action() {

	@Override
	public void run() {
	doSyncToc();
	}
	};
	syncTocAction.setToolTipText(Messages.BrowserPart_syncTocTooltip);
	syncTocAction.setImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_SYNC_TOC));
	syncTocAction.setEnabled(false);
	bookmarkAction = new Action() {

	@Override
	public void run() {
	String href = LinkUtil.stripParams(BaseHelpSystem.unresolve(url));
	BaseHelpSystem.getBookmarkManager().addBookmark(href, title);
	}
	};
	bookmarkAction.setToolTipText(Messages.BrowserPart_bookmarkTooltip);
	bookmarkAction.setImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_ADD_BOOKMARK));

	highlightAction = new Action() {

	@Override
	public void run() {
	IScopeContext instanceScope = InstanceScope.INSTANCE;
	IEclipsePreferences prefs = instanceScope.getNode(HelpBasePlugin.PLUGIN_ID);
	prefs.putBoolean(HIGHLIGHT_ON, highlightAction.isChecked());
	if (browser.getUrl().indexOf("resultof")!=-1) browser.execute("setHighlight(" +highlightAction.isChecked()+");"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	}
	};
	highlightAction.setChecked(highlight);
	highlightAction.setToolTipText(Messages.BrowserPart_highlightTooltip);
	highlightAction.setImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_HIGHLIGHT));

	printAction = new Action(ActionFactory.PRINT.getId()) {

	@Override
	public void run() {
	doPrint();
	}
	};
	printAction.setImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_HELP_PRINT));
	printAction.setToolTipText(Messages.BrowserPart_printTooltip);

	tbm.insertBefore("back", showExternalAction); //$NON-NLS-1$
	tbm.insertBefore("back", syncTocAction); //$NON-NLS-1$
	tbm.insertBefore("back", printAction); //$NON-NLS-1$
	tbm.insertBefore("back", bookmarkAction); //$NON-NLS-1$
	tbm.insertBefore("back", highlightAction); //$NON-NLS-1$
	tbm.insertBefore("back", new Separator()); //$NON-NLS-1$
	enableButtons();
	}

	private void contributeToMenu(IMenuManager menuManager) {
	if (FontUtils.canRescaleHelpView()) {
	fontScalePercentage = Platform.getPreferencesService().getInt(HelpBasePlugin.PLUGIN_ID,
	HELP_VIEW_SCALE, 100, null);
	if (menuManager != null) {
	addMenuActions(menuManager);
	}
	}
	}

	private void addMenuActions(IMenuManager menuManager) {
	magnifyAction = new Action() {

	@Override
	public void run() {
	doMagnify(SCALE_INCREMENT);
	}
	};
	magnifyAction.setToolTipText(Messages.BrowserPart_magnifyTooltip);
	magnifyAction.setText(Messages.BrowserPart_magnifyTooltip);
	magnifyAction.setImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_MAGNIFY));
	magnifyAction.setDisabledImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_D_MAGNIFY));

	reduceAction = new Action() {

	@Override
	public void run() {
	doMagnify(-SCALE_INCREMENT);
	}
	};
	reduceAction.setToolTipText(Messages.BrowserPart_reduceTooltip);
	reduceAction.setText(Messages.BrowserPart_reduceTooltip);
	reduceAction
	.setImageDescriptor(HelpUIResources.getImageDescriptor(IHelpUIConstants.IMAGE_REDUCE));
	reduceAction.setDisabledImageDescriptor(HelpUIResources
	.getImageDescriptor(IHelpUIConstants.IMAGE_D_REDUCE));
	menuManager.add(new Separator());
	menuManager.add(reduceAction);
	menuManager.add(magnifyAction);
	}

	@Override
	public void init(ReusableHelpPart parent, String id, IMemento memento) {
	this.parent = parent;
	this.id = id;
	if (memento != null) {
	String href = memento.getString("BrowserPart.url"); //$NON-NLS-1$
	if (href != null)
	showURL(BaseHelpSystem.resolve(href, "/help/ntopic").toString()); //$NON-NLS-1$
	}
	}

	@Override
	public String getId() {
	return id;
	}

	@Override
	public Control getControl() {
	return browser;
	}

	@Override
	public void setVisible(boolean visible) {
	if (browser != null) {
	browser.setVisible(visible);
	}
	}

	@Override
	public void setFocus() {
	if (browser != null)
	browser.setFocus();
	}

	public void showURL(String url) {
	if (browser != null && url != null) {
	browser.setUrl(url);
	}
	}

	public void clearBrowser() {
	if (browser != null) {
	browser.setText(EMPTY_PAGE);
	}
	}

	@Override
	public void stop() {
	if (browser != null && !browser.isDisposed()) {
	browser.stop();
	}
	}

	private void doPrint() {
	browser.execute("window.print();"); //$NON-NLS-1$
	}

	private void doSyncToc() {
	String href = BaseHelpSystem.unresolve(this.url);
	int ix = href.indexOf("?resultof="); //$NON-NLS-1$
	if (ix >= 0) {
	href = href.substring(0, ix);
	}
	parent.showPage(IHelpUIConstants.HV_ALL_TOPICS_PAGE);
	AllTopicsPart part = (AllTopicsPart) parent
	.findPart(IHelpUIConstants.HV_TOPIC_TREE);
	if (part != null) {
	part.selectReveal(href);
	}
	}

	private void updateSyncTocAction() {
	String href = BaseHelpSystem.unresolve(this.url);
	syncTocAction.setEnabled(parent.isHelpResource(href));
	}

	private boolean redirectLink(final String url) {
	if (url.indexOf("/topic/") != -1) { //$NON-NLS-1$
	if (url.indexOf("noframes") == -1) { //$NON-NLS-1$
	return true;
	}
	} else if (url.indexOf("livehelp/?pluginID=")>0) { //$NON-NLS-1$
	processLiveAction(url);
	return true;
	} else if (url.indexOf("helpview:") == 0) { //$NON-NLS-1$
	HelpviewProtocol.handleProtocolCall(url, parent);
	return true;
	}
	return false;
	}

	private void processLiveAction(String url) {
	if (!Platform.getPreferencesService().getBoolean(HelpBasePlugin.PLUGIN_ID, "activeHelp", false, null)) { //$NON-NLS-1$
	return;
	}

	String query = null;
	try {
	URL u = new URL(url);
	query = u.getQuery();
	} catch (MalformedURLException mue) {
	}
	if (query == null)
	return;
	StringTokenizer st = new StringTokenizer(query, "=&"); //$NON-NLS-1$
	if (st.countTokens() < 6) {
	return;
	}
	st.nextToken();
	String pluginId = URLCoder.decode(st.nextToken());
	st.nextToken();
	String className = URLCoder.decode(st.nextToken());
	st.nextToken();
	String arg = URLCoder.decode(st.nextToken());
	if (pluginId == null \|\| className == null \|\| arg == null)
	return;
	BaseHelpSystem.runLiveHelp(pluginId, className, arg);
	}

	@Override
	public boolean fillContextMenu(IMenuManager manager) {
	return false;
	}

	@Override
	public boolean hasFocusControl(Control control) {
	return browser.equals(control);
	}

	@Override
	public IAction getGlobalAction(String id) {
	if (id.equals(ActionFactory.PRINT.getId()))
	return printAction;
	return null;
	}

	private void enableButtons() {
	if (magnifyAction != null) {
	magnifyAction.setEnabled(fontScalePercentage < SCALE_MAX);
	reduceAction.setEnabled(fontScalePercentage > SCALE_MIN);
	}
	}

	private void doMagnify(int percent) {
	fontScalePercentage += percent;
	IScopeContext instanceScope = InstanceScope.INSTANCE;
	IEclipsePreferences prefs = instanceScope.getNode(HelpBasePlugin.PLUGIN_ID);
	prefs.putInt(HELP_VIEW_SCALE, fontScalePercentage);
	try {
	prefs.flush();
	} catch (BackingStoreException e) {
	}
	rescale();
	}

	public void rescale() {
	browser.execute(FontUtils.getRescaleScript(fontScalePercentage));
	enableButtons();
	}

	@Override
	public void toggleRoleFilter() {
	}

	@Override
	public void refilter() {
	showURL(this.url);
	}

	@Override
	public void saveState(IMemento memento) {
	if (url != null) {
	String href = BaseHelpSystem.unresolve(url);
	memento.putString("BrowserPart.url", href); //$NON-NLS-1$
	}
	}
	}