bundles/org.eclipse.ui.browser/src/org/eclipse/ui/internal/browser/WebBrowserPreferencePage.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2003, 2005 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.ui.internal.browser;

 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;

 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.dialogs.ProgressMonitorDialog;
 import org.eclipse.jface.operation.IRunnableWithProgress;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.jface.viewers.CheckStateChangedEvent;
 import org.eclipse.jface.viewers.CheckboxTableViewer;
 import org.eclipse.jface.viewers.ColumnWeightData;
 import org.eclipse.jface.viewers.DoubleClickEvent;
 import org.eclipse.jface.viewers.ICheckStateListener;
 import org.eclipse.jface.viewers.IDoubleClickListener;
 import org.eclipse.jface.viewers.ILabelProviderListener;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITableLabelProvider;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.TableLayout;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.window.Window;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.KeyEvent;
 import org.eclipse.swt.events.KeyListener;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.DirectoryDialog;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
 import org.eclipse.swt.widgets.TableItem;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 import org.eclipse.ui.PlatformUI;

 /**
  * The preference page that holds Web browser preferences.
  */
 public class WebBrowserPreferencePage extends PreferencePage implements
 		IWorkbenchPreferencePage {
 	protected Button internal;

 	protected Button external;

 	protected Table table;

 	protected CheckboxTableViewer tableViewer;

 	protected Button edit;

 	protected Button remove;

 	protected Button search;

 	protected Label location;

 	protected Label parameters;

 	protected IBrowserDescriptor checkedBrowser;

 	class BrowserContentProvider implements IStructuredContentProvider {
 		public Object[] getElements(Object inputElement) {
 			List list = new ArrayList();
 			Iterator iterator = BrowserManager.getInstance().getWebBrowsers()
 					.iterator();
 			while (iterator.hasNext()) {
 				IBrowserDescriptor browser = (IBrowserDescriptor) iterator
 						.next();
 				list.add(browser);
 			}
 			return list.toArray();
 		}

 		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 			// do nothing
 		}

 		public void dispose() {
 			// do nothing
 		}
 	}

 	class BrowserTableLabelProvider implements ITableLabelProvider {
 		public Image getColumnImage(Object element, int columnIndex) {
 			return null;
 		}

 		public String getColumnText(Object element, int columnIndex) {
 			IBrowserDescriptor browser = (IBrowserDescriptor) element;
 			return notNull(browser.getName());
 		}

 		protected String notNull(String s) {
 			if (s == null)
 				return ""; //$NON-NLS-1$
 			return s;
 		}

 		public boolean isLabelProperty(Object element, String property) {
 			return false;
 		}

 		public void addListener(ILabelProviderListener listener) {
 			// do nothing
 		}

 		public void removeListener(ILabelProviderListener listener) {
 			// do nothing
 		}

 		public void dispose() {
 			// do nothing
 		}
 	}

 	/**
 	 * WebBrowserPreferencePage constructor comment.
 	 */
 	public WebBrowserPreferencePage() {
 		super();
 	}

 	/**
 	 * Create the preference options.
 	 *
 	 * @param parent
 	 *            org.eclipse.swt.widgets.Composite
 	 * @return org.eclipse.swt.widgets.Control
 	 */
 	protected Control createContents(Composite parent) {
 		initializeDialogUnits(parent);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
 				ContextIds.PREF_BROWSER);

 		Composite composite = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		layout.horizontalSpacing = convertHorizontalDLUsToPixels(4);
 		layout.verticalSpacing = convertVerticalDLUsToPixels(3);
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		composite.setLayout(layout);
 		GridData data = new GridData(GridData.FILL_HORIZONTAL
 				| GridData.VERTICAL_ALIGN_FILL);
 		composite.setLayoutData(data);

 		Label label = new Label(composite, SWT.WRAP);
 		label.setText(Messages.preferenceWebBrowserDescription);
 		data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		data.horizontalSpan = 2;
 		label.setLayoutData(data);

 		label = new Label(composite, SWT.WRAP);
 		data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		data.horizontalSpan = 2;
 		label.setLayoutData(data);

 		internal = new Button(composite, SWT.RADIO);
 		internal.setText(Messages.prefInternalBrowser);
 		data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		data.horizontalSpan = 2;
 		internal.setLayoutData(data);

 		if (!WebBrowserUtil.canUseInternalWebBrowser())
 			internal.setEnabled(false);

 		external = new Button(composite, SWT.RADIO);
 		external.setText(Messages.prefExternalBrowser);
 		data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		data.horizontalSpan = 2;
 		external.setLayoutData(data);

 		label = new Label(composite, SWT.NONE);
 		label.setText(Messages.browserList);
 		data = new GridData(GridData.FILL_HORIZONTAL
 				| GridData.VERTICAL_ALIGN_CENTER);
 		data.horizontalSpan = 2;
 		label.setLayoutData(data);

 		table = new Table(composite, SWT.CHECK | SWT.BORDER | SWT.V_SCROLL
 				| SWT.H_SCROLL | SWT.SINGLE | SWT.FULL_SELECTION);
 		data = new GridData(GridData.FILL_BOTH);
 		table.setLayoutData(data);
 		table.setHeaderVisible(false);
 		table.setLinesVisible(false);

 		TableLayout tableLayout = new TableLayout();
 		new TableColumn(table, SWT.NONE);
 		tableLayout.addColumnData(new ColumnWeightData(100));
 		table.setLayout(tableLayout);

 		tableViewer = new CheckboxTableViewer(table);
 		tableViewer.setContentProvider(new BrowserContentProvider());
 		tableViewer.setLabelProvider(new BrowserTableLabelProvider());
 		tableViewer.setInput("root"); //$NON-NLS-1$

 		// uncheck any other elements that might be checked and leave only the
 		// element checked to remain checked since one can only chose one
 		// brower at a time to be current.
 		tableViewer.addCheckStateListener(new ICheckStateListener() {
 			public void checkStateChanged(CheckStateChangedEvent e) {
 				checkNewDefaultBrowser(e.getElement());
 				checkedBrowser = (IBrowserDescriptor) e.getElement();

 				// if no other browsers are checked, don't allow the single one
 				// currently checked to become unchecked, and lose a current
 				// browser. That is, don't permit unchecking if no other item
 				// is checked which is supposed to be the case.
 				Object[] obj = tableViewer.getCheckedElements();
 				if (obj.length == 0)
 					tableViewer.setChecked(e.getElement(), true);
 			}
 		});

 		// set a default, checked browser based on the current browser. If there
 		// is not a current browser, but the first item exists, use that instead.
 		// This will work currently until workbench shutdown, because current
 		// browser is not yet persisted.
 		checkedBrowser = BrowserManager.getInstance().getCurrentWebBrowser();
 		if (checkedBrowser != null)
 			tableViewer.setChecked(checkedBrowser, true);
 		else {
 			Object obj = tableViewer.getElementAt(0);
 			if (obj != null)
 				tableViewer.setChecked(obj, true);
 		}

 		tableViewer
 				.addSelectionChangedListener(new ISelectionChangedListener() {
 					public void selectionChanged(SelectionChangedEvent event) {
 						IStructuredSelection sele = ((IStructuredSelection) tableViewer
 								.getSelection());
 						boolean sel = sele.getFirstElement() != null &&
 								!(sele.getFirstElement() instanceof SystemBrowserDescriptor);
 						remove.setEnabled(sel);
 						edit.setEnabled(sel);
 					}
 				});

 		tableViewer.addDoubleClickListener(new IDoubleClickListener() {
 			public void doubleClick(DoubleClickEvent event) {
 				IStructuredSelection sel = ((IStructuredSelection) tableViewer
 						.getSelection());
 				if (sel.getFirstElement() != null) {
 					IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
 							.getFirstElement();
 					IBrowserDescriptorWorkingCopy wc = browser2
 							.getWorkingCopy();
 					BrowserDescriptorDialog dialog = new BrowserDescriptorDialog(
 							getShell(), wc);
 					if (dialog.open() != Window.CANCEL) {
 						try {
 							tableViewer.refresh(wc.save());
 						} catch (Exception ex) {
 							// ignore
 						}
 					}
 				}
 			}
 		});

 		table.addKeyListener(new KeyListener() {
 			public void keyPressed(KeyEvent e) {
 				if (e.character == SWT.DEL) {
 					IStructuredSelection sel = ((IStructuredSelection) tableViewer
 							.getSelection());
 					if (sel.getFirstElement() != null) {
 						IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
 								.getFirstElement();
 						try {
 							browser2.delete();
 							tableViewer.remove(browser2);

 							// need here to ensure that if the item deleted was
 							// checked, ie. was
 							// the current browser, that the new current browser
 							// will be the first in the
 							// list, typically, the internal browser, which
 							// cannot be
 							// deleted, and be current
 							BrowserManager manager = BrowserManager.getInstance();
 							if (browser2 == checkedBrowser) {
 								if (manager.browsers.size() > 0) {
 									checkedBrowser = (IBrowserDescriptor) manager.browsers.get(0);
 									tableViewer.setChecked(checkedBrowser, true);
 								}
 							}
 						} catch (Exception ex) {
 							// ignore
 						}
 					}
 				}
 			}

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

 		Composite buttonComp = new Composite(composite, SWT.NONE);
 		layout = new GridLayout();
 		layout.horizontalSpacing = 0;
 		layout.verticalSpacing = convertVerticalDLUsToPixels(3);
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		layout.numColumns = 1;
 		buttonComp.setLayout(layout);
 		data = new GridData(GridData.HORIZONTAL_ALIGN_FILL
 				| GridData.VERTICAL_ALIGN_FILL);
 		buttonComp.setLayoutData(data);

 		final Button add = SWTUtil.createButton(buttonComp, Messages.add);
 		add.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				BrowserDescriptorDialog dialog = new BrowserDescriptorDialog(
 						getShell());
 				if (dialog.open() == Window.CANCEL)
 					return;
 				tableViewer.refresh();
 				if (checkedBrowser != null)
 					tableViewer.setChecked(checkedBrowser, true);
 			}
 		});

 		edit = SWTUtil.createButton(buttonComp, Messages.edit);
 		edit.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				IStructuredSelection sel = ((IStructuredSelection) tableViewer
 						.getSelection());
 				IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
 						.getFirstElement();
 				IBrowserDescriptorWorkingCopy wc = browser2.getWorkingCopy();
 				BrowserDescriptorDialog dialog = new BrowserDescriptorDialog(
 						getShell(), wc);
 				if (dialog.open() != Window.CANCEL) {
 					try {
 						tableViewer.refresh(wc.save());
 					} catch (Exception ex) {
 						// ignore
 					}
 				}
 			}
 		});

 		remove = SWTUtil.createButton(buttonComp, Messages.remove);
 		remove.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				IStructuredSelection sel = ((IStructuredSelection) tableViewer
 						.getSelection());
 				IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
 						.getFirstElement();
 				try {
 					browser2.delete();
 					tableViewer.remove(browser2);

 					// need here to ensure that if the item deleted was checked,
 					// ie. was
 					// the current browser, that the new current browser will be
 					// the first in the
 					// list, typically, the internal browser, which cannot be
 					// deleted, and be current
 					BrowserManager manager = BrowserManager.getInstance();
 					if (browser2 == checkedBrowser) {
 						if (manager.browsers.size() > 0) {
 							checkedBrowser = (IBrowserDescriptor) manager.browsers.get(0);
 							tableViewer.setChecked(checkedBrowser, true);
 						}
 					}
 				} catch (Exception ex) {
 					// ignore
 				}
 			}
 		});

 		search = SWTUtil.createButton(buttonComp, Messages.search);
 		data = (GridData) search.getLayoutData();
 		data.verticalIndent = 9;
 		search.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				final List foundBrowsers = new ArrayList();
 				final List existingPaths = WebBrowserUtil
 						.getExternalBrowserPaths();

 				// select a target directory for the search
 				DirectoryDialog dialog = new DirectoryDialog(getShell());
 				dialog.setMessage(Messages.selectDirectory);
 				dialog.setText(Messages.directoryDialogTitle);

 				String path = dialog.open();
 				if (path == null)
 					return;

 				final File rootDir = new File(path);
 				ProgressMonitorDialog pm = new ProgressMonitorDialog(getShell());

 				IRunnableWithProgress r = new IRunnableWithProgress() {
 					public void run(IProgressMonitor monitor) {
 						monitor.beginTask(Messages.searchingTaskName,
 								IProgressMonitor.UNKNOWN);
 						search(rootDir, existingPaths, foundBrowsers, monitor);
 						monitor.done();
 					}
 				};

 				try {
 					pm.run(true, true, r);
 				} catch (InvocationTargetException ex) {
 					Trace.trace(Trace.SEVERE,
 							"Invocation Exception occured running monitor: " //$NON-NLS-1$
 									+ ex);
 				} catch (InterruptedException ex) {
 					Trace.trace(Trace.SEVERE,
 							"Interrupted exception occured running monitor: " //$NON-NLS-1$
 									+ ex);
 					return;
 				}

 				if (pm.getProgressMonitor().isCanceled())
 					return;

 				List browsersToCreate = foundBrowsers;

 				if (browsersToCreate == null) // cancelled
 					return;

 				if (browsersToCreate.isEmpty()) { // no browsers found
 					WebBrowserUtil.openMessage(Messages.searchingNoneFound);
 					return;
 				}

 				Iterator iterator = browsersToCreate.iterator();
 				while (iterator.hasNext()) {
 					IBrowserDescriptorWorkingCopy browser2 = (IBrowserDescriptorWorkingCopy) iterator
 							.next();
 					browser2.save();
 				}
 				tableViewer.refresh();

 				if (checkedBrowser != null)
 					tableViewer.setChecked(checkedBrowser, true);
 			}
 		});

 		tableViewer.addCheckStateListener(new ICheckStateListener() {
 			public void checkStateChanged(CheckStateChangedEvent e) {
 				checkNewDefaultBrowser(e.getElement());
 				checkedBrowser = (IBrowserDescriptor) e
 						.getElement();
 			}
 		});

 		/*external.addSelectionListener(new SelectionListener() {
 			public void widgetSelected(SelectionEvent e) {
 				boolean sel = !tableViewer.getSelection().isEmpty();
 				edit.setEnabled(sel);
 				remove.setEnabled(sel);
 			}

 			public void widgetDefaultSelected(SelectionEvent e) {
 				// ignore
 			}
 		});*/
 		internal.setSelection(WebBrowserPreference.getBrowserChoice() == WebBrowserPreference.INTERNAL);
 		external.setSelection(WebBrowserPreference.getBrowserChoice() == WebBrowserPreference.EXTERNAL);

 		//boolean sel = !tableViewer.getSelection().isEmpty();
 		IStructuredSelection sele = ((IStructuredSelection) tableViewer
 				.getSelection());
 		boolean sel = sele.getFirstElement() != null &&
 				!(sele.getFirstElement() instanceof SystemBrowserDescriptor);
 		edit.setEnabled(sel);
 		remove.setEnabled(sel);

 		Dialog.applyDialogFont(composite);

 		return composite;
 	}

 	/**
 	 * Initializes this preference page using the passed workbench.
 	 *
 	 * @param workbench
 	 *            the current workbench
 	 */
 	public void init(IWorkbench workbench) {
 		// do nothing
 	}

 	/**
 	 *
 	 */
 	public void setVisible(boolean visible) {
 		super.setVisible(visible);
 		if (visible)
 			setTitle(Messages.preferenceWebBrowserTitleLong);
 	}

 	protected Object getSelection(ISelection sel2) {
 		IStructuredSelection sel = (IStructuredSelection) sel2;
 		return sel.getFirstElement();
 	}

 	// Uncheck all the items except the current one that was just checked
 	protected void checkNewDefaultBrowser(Object browser) {
 		TableItem[] children = tableViewer.getTable().getItems();
 		for (int i = 0; i < children.length; i++) {
 			TableItem item = children[i];

 			if (!(item.getData().equals(browser)))
 				item.setChecked(false);
 		}
 	}

 	protected static void search(File directory, List existingPaths,
 			List foundBrowsers, IProgressMonitor monitor) {
 		if (monitor.isCanceled())
 			return;

 		monitor.subTask(NLS.bind(Messages.searching,
 				new String[] { Integer.toString(foundBrowsers.size()), directory.getAbsolutePath()}));

 		String[] names = directory.list();
 		List subDirs = new ArrayList();

 		for (int i = 0; i < names.length; i++) {
 			if (monitor.isCanceled())
 				return;

 			File file = new File(directory, names[i]);

 			if (existingPaths.contains(file.getAbsolutePath().toLowerCase()))
 				continue;

 			IBrowserDescriptorWorkingCopy wc = WebBrowserUtil
 					.createExternalBrowser(file);
 			if (wc != null)
 				foundBrowsers.add(wc);

 			if (file.isDirectory()) {
 				if (monitor.isCanceled())
 					return;
 				subDirs.add(file);
 			}
 		}
 		while (!subDirs.isEmpty()) {
 			File subDir = (File) subDirs.remove(0);
 			search(subDir, existingPaths, foundBrowsers, monitor);
 			if (monitor.isCanceled()) {
 				return;
 			}
 		}
 	}

 	/**
 	 * Performs special processing when this page's Defaults button has been
 	 * pressed.
 	 */
 	protected void performDefaults() {
 		internal.setSelection(WebBrowserPreference
 				.isDefaultUseInternalBrowser());
 		external.setSelection(!WebBrowserPreference.
 				isDefaultUseInternalBrowser());

 		BrowserManager.getInstance().currentBrowser = null;
 		BrowserManager.getInstance().setupDefaultBrowsers();
 		tableViewer.refresh();

 		checkedBrowser = BrowserManager.getInstance().getCurrentWebBrowser();
 		if (checkedBrowser != null)
 			tableViewer.setChecked(checkedBrowser, true);

 		super.performDefaults();
 	}

 	/**
 	 * Method declared on IPreferencePage. Subclasses should override
 	 */
 	public boolean performOk() {
 		int choice;
 		if (internal.getSelection())
 			choice = WebBrowserPreference.INTERNAL;
 		else
 			choice = WebBrowserPreference.EXTERNAL;
 		WebBrowserPreference.setBrowserChoice(choice);
 		if (checkedBrowser != null)
 			BrowserManager.getInstance().setCurrentWebBrowser(checkedBrowser);

 		return true;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2003, 2005 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.ui.internal.browser;

	import java.io.File;
	import java.lang.reflect.InvocationTargetException;
	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;

	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.dialogs.ProgressMonitorDialog;
	import org.eclipse.jface.operation.IRunnableWithProgress;
	import org.eclipse.jface.preference.PreferencePage;
	import org.eclipse.jface.viewers.CheckStateChangedEvent;
	import org.eclipse.jface.viewers.CheckboxTableViewer;
	import org.eclipse.jface.viewers.ColumnWeightData;
	import org.eclipse.jface.viewers.DoubleClickEvent;
	import org.eclipse.jface.viewers.ICheckStateListener;
	import org.eclipse.jface.viewers.IDoubleClickListener;
	import org.eclipse.jface.viewers.ILabelProviderListener;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.IStructuredContentProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITableLabelProvider;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.TableLayout;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.window.Window;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.KeyEvent;
	import org.eclipse.swt.events.KeyListener;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.DirectoryDialog;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Table;
	import org.eclipse.swt.widgets.TableColumn;
	import org.eclipse.swt.widgets.TableItem;
	import org.eclipse.ui.IWorkbench;
	import org.eclipse.ui.IWorkbenchPreferencePage;
	import org.eclipse.ui.PlatformUI;

	/**
	* The preference page that holds Web browser preferences.
	*/
	public class WebBrowserPreferencePage extends PreferencePage implements
	IWorkbenchPreferencePage {
	protected Button internal;

	protected Button external;

	protected Table table;

	protected CheckboxTableViewer tableViewer;

	protected Button edit;

	protected Button remove;

	protected Button search;

	protected Label location;

	protected Label parameters;

	protected IBrowserDescriptor checkedBrowser;

	class BrowserContentProvider implements IStructuredContentProvider {
	public Object[] getElements(Object inputElement) {
	List list = new ArrayList();
	Iterator iterator = BrowserManager.getInstance().getWebBrowsers()
	.iterator();
	while (iterator.hasNext()) {
	IBrowserDescriptor browser = (IBrowserDescriptor) iterator
	.next();
	list.add(browser);
	}
	return list.toArray();
	}

	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	// do nothing
	}

	public void dispose() {
	// do nothing
	}
	}

	class BrowserTableLabelProvider implements ITableLabelProvider {
	public Image getColumnImage(Object element, int columnIndex) {
	return null;
	}

	public String getColumnText(Object element, int columnIndex) {
	IBrowserDescriptor browser = (IBrowserDescriptor) element;
	return notNull(browser.getName());
	}

	protected String notNull(String s) {
	if (s == null)
	return ""; //$NON-NLS-1$
	return s;
	}

	public boolean isLabelProperty(Object element, String property) {
	return false;
	}

	public void addListener(ILabelProviderListener listener) {
	// do nothing
	}

	public void removeListener(ILabelProviderListener listener) {
	// do nothing
	}

	public void dispose() {
	// do nothing
	}
	}

	/**
	* WebBrowserPreferencePage constructor comment.
	*/
	public WebBrowserPreferencePage() {
	super();
	}

	/**
	* Create the preference options.
	*
	* @param parent
	* org.eclipse.swt.widgets.Composite
	* @return org.eclipse.swt.widgets.Control
	*/
	protected Control createContents(Composite parent) {
	initializeDialogUnits(parent);
	PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
	ContextIds.PREF_BROWSER);

	Composite composite = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.horizontalSpacing = convertHorizontalDLUsToPixels(4);
	layout.verticalSpacing = convertVerticalDLUsToPixels(3);
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	composite.setLayout(layout);
	GridData data = new GridData(GridData.FILL_HORIZONTAL
	\| GridData.VERTICAL_ALIGN_FILL);
	composite.setLayoutData(data);

	Label label = new Label(composite, SWT.WRAP);
	label.setText(Messages.preferenceWebBrowserDescription);
	data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	data.horizontalSpan = 2;
	label.setLayoutData(data);

	label = new Label(composite, SWT.WRAP);
	data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	data.horizontalSpan = 2;
	label.setLayoutData(data);

	internal = new Button(composite, SWT.RADIO);
	internal.setText(Messages.prefInternalBrowser);
	data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	data.horizontalSpan = 2;
	internal.setLayoutData(data);

	if (!WebBrowserUtil.canUseInternalWebBrowser())
	internal.setEnabled(false);

	external = new Button(composite, SWT.RADIO);
	external.setText(Messages.prefExternalBrowser);
	data = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	data.horizontalSpan = 2;
	external.setLayoutData(data);

	label = new Label(composite, SWT.NONE);
	label.setText(Messages.browserList);
	data = new GridData(GridData.FILL_HORIZONTAL
	\| GridData.VERTICAL_ALIGN_CENTER);
	data.horizontalSpan = 2;
	label.setLayoutData(data);

	table = new Table(composite, SWT.CHECK \| SWT.BORDER \| SWT.V_SCROLL
	\| SWT.H_SCROLL \| SWT.SINGLE \| SWT.FULL_SELECTION);
	data = new GridData(GridData.FILL_BOTH);
	table.setLayoutData(data);
	table.setHeaderVisible(false);
	table.setLinesVisible(false);

	TableLayout tableLayout = new TableLayout();
	new TableColumn(table, SWT.NONE);
	tableLayout.addColumnData(new ColumnWeightData(100));
	table.setLayout(tableLayout);

	tableViewer = new CheckboxTableViewer(table);
	tableViewer.setContentProvider(new BrowserContentProvider());
	tableViewer.setLabelProvider(new BrowserTableLabelProvider());
	tableViewer.setInput("root"); //$NON-NLS-1$

	// uncheck any other elements that might be checked and leave only the
	// element checked to remain checked since one can only chose one
	// brower at a time to be current.
	tableViewer.addCheckStateListener(new ICheckStateListener() {
	public void checkStateChanged(CheckStateChangedEvent e) {
	checkNewDefaultBrowser(e.getElement());
	checkedBrowser = (IBrowserDescriptor) e.getElement();

	// if no other browsers are checked, don't allow the single one
	// currently checked to become unchecked, and lose a current
	// browser. That is, don't permit unchecking if no other item
	// is checked which is supposed to be the case.
	Object[] obj = tableViewer.getCheckedElements();
	if (obj.length == 0)
	tableViewer.setChecked(e.getElement(), true);
	}
	});

	// set a default, checked browser based on the current browser. If there
	// is not a current browser, but the first item exists, use that instead.
	// This will work currently until workbench shutdown, because current
	// browser is not yet persisted.
	checkedBrowser = BrowserManager.getInstance().getCurrentWebBrowser();
	if (checkedBrowser != null)
	tableViewer.setChecked(checkedBrowser, true);
	else {
	Object obj = tableViewer.getElementAt(0);
	if (obj != null)
	tableViewer.setChecked(obj, true);
	}

	tableViewer
	.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(SelectionChangedEvent event) {
	IStructuredSelection sele = ((IStructuredSelection) tableViewer
	.getSelection());
	boolean sel = sele.getFirstElement() != null &&
	!(sele.getFirstElement() instanceof SystemBrowserDescriptor);
	remove.setEnabled(sel);
	edit.setEnabled(sel);
	}
	});

	tableViewer.addDoubleClickListener(new IDoubleClickListener() {
	public void doubleClick(DoubleClickEvent event) {
	IStructuredSelection sel = ((IStructuredSelection) tableViewer
	.getSelection());
	if (sel.getFirstElement() != null) {
	IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
	.getFirstElement();
	IBrowserDescriptorWorkingCopy wc = browser2
	.getWorkingCopy();
	BrowserDescriptorDialog dialog = new BrowserDescriptorDialog(
	getShell(), wc);
	if (dialog.open() != Window.CANCEL) {
	try {
	tableViewer.refresh(wc.save());
	} catch (Exception ex) {
	// ignore
	}
	}
	}
	}
	});

	table.addKeyListener(new KeyListener() {
	public void keyPressed(KeyEvent e) {
	if (e.character == SWT.DEL) {
	IStructuredSelection sel = ((IStructuredSelection) tableViewer
	.getSelection());
	if (sel.getFirstElement() != null) {
	IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
	.getFirstElement();
	try {
	browser2.delete();
	tableViewer.remove(browser2);

	// need here to ensure that if the item deleted was
	// checked, ie. was
	// the current browser, that the new current browser
	// will be the first in the
	// list, typically, the internal browser, which
	// cannot be
	// deleted, and be current
	BrowserManager manager = BrowserManager.getInstance();
	if (browser2 == checkedBrowser) {
	if (manager.browsers.size() > 0) {
	checkedBrowser = (IBrowserDescriptor) manager.browsers.get(0);
	tableViewer.setChecked(checkedBrowser, true);
	}
	}
	} catch (Exception ex) {
	// ignore
	}
	}
	}
	}

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

	Composite buttonComp = new Composite(composite, SWT.NONE);
	layout = new GridLayout();
	layout.horizontalSpacing = 0;
	layout.verticalSpacing = convertVerticalDLUsToPixels(3);
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	layout.numColumns = 1;
	buttonComp.setLayout(layout);
	data = new GridData(GridData.HORIZONTAL_ALIGN_FILL
	\| GridData.VERTICAL_ALIGN_FILL);
	buttonComp.setLayoutData(data);

	final Button add = SWTUtil.createButton(buttonComp, Messages.add);
	add.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	BrowserDescriptorDialog dialog = new BrowserDescriptorDialog(
	getShell());
	if (dialog.open() == Window.CANCEL)
	return;
	tableViewer.refresh();
	if (checkedBrowser != null)
	tableViewer.setChecked(checkedBrowser, true);
	}
	});

	edit = SWTUtil.createButton(buttonComp, Messages.edit);
	edit.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	IStructuredSelection sel = ((IStructuredSelection) tableViewer
	.getSelection());
	IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
	.getFirstElement();
	IBrowserDescriptorWorkingCopy wc = browser2.getWorkingCopy();
	BrowserDescriptorDialog dialog = new BrowserDescriptorDialog(
	getShell(), wc);
	if (dialog.open() != Window.CANCEL) {
	try {
	tableViewer.refresh(wc.save());
	} catch (Exception ex) {
	// ignore
	}
	}
	}
	});

	remove = SWTUtil.createButton(buttonComp, Messages.remove);
	remove.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	IStructuredSelection sel = ((IStructuredSelection) tableViewer
	.getSelection());
	IBrowserDescriptor browser2 = (IBrowserDescriptor) sel
	.getFirstElement();
	try {
	browser2.delete();
	tableViewer.remove(browser2);

	// need here to ensure that if the item deleted was checked,
	// ie. was
	// the current browser, that the new current browser will be
	// the first in the
	// list, typically, the internal browser, which cannot be
	// deleted, and be current
	BrowserManager manager = BrowserManager.getInstance();
	if (browser2 == checkedBrowser) {
	if (manager.browsers.size() > 0) {
	checkedBrowser = (IBrowserDescriptor) manager.browsers.get(0);
	tableViewer.setChecked(checkedBrowser, true);
	}
	}
	} catch (Exception ex) {
	// ignore
	}
	}
	});

	search = SWTUtil.createButton(buttonComp, Messages.search);
	data = (GridData) search.getLayoutData();
	data.verticalIndent = 9;
	search.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	final List foundBrowsers = new ArrayList();
	final List existingPaths = WebBrowserUtil
	.getExternalBrowserPaths();

	// select a target directory for the search
	DirectoryDialog dialog = new DirectoryDialog(getShell());
	dialog.setMessage(Messages.selectDirectory);
	dialog.setText(Messages.directoryDialogTitle);

	String path = dialog.open();
	if (path == null)
	return;

	final File rootDir = new File(path);
	ProgressMonitorDialog pm = new ProgressMonitorDialog(getShell());

	IRunnableWithProgress r = new IRunnableWithProgress() {
	public void run(IProgressMonitor monitor) {
	monitor.beginTask(Messages.searchingTaskName,
	IProgressMonitor.UNKNOWN);
	search(rootDir, existingPaths, foundBrowsers, monitor);
	monitor.done();
	}
	};

	try {
	pm.run(true, true, r);
	} catch (InvocationTargetException ex) {
	Trace.trace(Trace.SEVERE,
	"Invocation Exception occured running monitor: " //$NON-NLS-1$
	+ ex);
	} catch (InterruptedException ex) {
	Trace.trace(Trace.SEVERE,
	"Interrupted exception occured running monitor: " //$NON-NLS-1$
	+ ex);
	return;
	}

	if (pm.getProgressMonitor().isCanceled())
	return;

	List browsersToCreate = foundBrowsers;

	if (browsersToCreate == null) // cancelled
	return;

	if (browsersToCreate.isEmpty()) { // no browsers found
	WebBrowserUtil.openMessage(Messages.searchingNoneFound);
	return;
	}

	Iterator iterator = browsersToCreate.iterator();
	while (iterator.hasNext()) {
	IBrowserDescriptorWorkingCopy browser2 = (IBrowserDescriptorWorkingCopy) iterator
	.next();
	browser2.save();
	}
	tableViewer.refresh();

	if (checkedBrowser != null)
	tableViewer.setChecked(checkedBrowser, true);
	}
	});

	tableViewer.addCheckStateListener(new ICheckStateListener() {
	public void checkStateChanged(CheckStateChangedEvent e) {
	checkNewDefaultBrowser(e.getElement());
	checkedBrowser = (IBrowserDescriptor) e
	.getElement();
	}
	});

	/*external.addSelectionListener(new SelectionListener() {
	public void widgetSelected(SelectionEvent e) {
	boolean sel = !tableViewer.getSelection().isEmpty();
	edit.setEnabled(sel);
	remove.setEnabled(sel);
	}

	public void widgetDefaultSelected(SelectionEvent e) {
	// ignore
	}
	});*/
	internal.setSelection(WebBrowserPreference.getBrowserChoice() == WebBrowserPreference.INTERNAL);
	external.setSelection(WebBrowserPreference.getBrowserChoice() == WebBrowserPreference.EXTERNAL);

	//boolean sel = !tableViewer.getSelection().isEmpty();
	IStructuredSelection sele = ((IStructuredSelection) tableViewer
	.getSelection());
	boolean sel = sele.getFirstElement() != null &&
	!(sele.getFirstElement() instanceof SystemBrowserDescriptor);
	edit.setEnabled(sel);
	remove.setEnabled(sel);

	Dialog.applyDialogFont(composite);

	return composite;
	}

	/**
	* Initializes this preference page using the passed workbench.
	*
	* @param workbench
	* the current workbench
	*/
	public void init(IWorkbench workbench) {
	// do nothing
	}

	/**
	*
	*/
	public void setVisible(boolean visible) {
	super.setVisible(visible);
	if (visible)
	setTitle(Messages.preferenceWebBrowserTitleLong);
	}

	protected Object getSelection(ISelection sel2) {
	IStructuredSelection sel = (IStructuredSelection) sel2;
	return sel.getFirstElement();
	}

	// Uncheck all the items except the current one that was just checked
	protected void checkNewDefaultBrowser(Object browser) {
	TableItem[] children = tableViewer.getTable().getItems();
	for (int i = 0; i < children.length; i++) {
	TableItem item = children[i];

	if (!(item.getData().equals(browser)))
	item.setChecked(false);
	}
	}

	protected static void search(File directory, List existingPaths,
	List foundBrowsers, IProgressMonitor monitor) {
	if (monitor.isCanceled())
	return;

	monitor.subTask(NLS.bind(Messages.searching,
	new String[] { Integer.toString(foundBrowsers.size()), directory.getAbsolutePath()}));

	String[] names = directory.list();
	List subDirs = new ArrayList();

	for (int i = 0; i < names.length; i++) {
	if (monitor.isCanceled())
	return;

	File file = new File(directory, names[i]);

	if (existingPaths.contains(file.getAbsolutePath().toLowerCase()))
	continue;

	IBrowserDescriptorWorkingCopy wc = WebBrowserUtil
	.createExternalBrowser(file);
	if (wc != null)
	foundBrowsers.add(wc);

	if (file.isDirectory()) {
	if (monitor.isCanceled())
	return;
	subDirs.add(file);
	}
	}
	while (!subDirs.isEmpty()) {
	File subDir = (File) subDirs.remove(0);
	search(subDir, existingPaths, foundBrowsers, monitor);
	if (monitor.isCanceled()) {
	return;
	}
	}
	}

	/**
	* Performs special processing when this page's Defaults button has been
	* pressed.
	*/
	protected void performDefaults() {
	internal.setSelection(WebBrowserPreference
	.isDefaultUseInternalBrowser());
	external.setSelection(!WebBrowserPreference.
	isDefaultUseInternalBrowser());

	BrowserManager.getInstance().currentBrowser = null;
	BrowserManager.getInstance().setupDefaultBrowsers();
	tableViewer.refresh();

	checkedBrowser = BrowserManager.getInstance().getCurrentWebBrowser();
	if (checkedBrowser != null)
	tableViewer.setChecked(checkedBrowser, true);

	super.performDefaults();
	}

	/**
	* Method declared on IPreferencePage. Subclasses should override
	*/
	public boolean performOk() {
	int choice;
	if (internal.getSelection())
	choice = WebBrowserPreference.INTERNAL;
	else
	choice = WebBrowserPreference.EXTERNAL;
	WebBrowserPreference.setBrowserChoice(choice);
	if (checkedBrowser != null)
	BrowserManager.getInstance().setCurrentWebBrowser(checkedBrowser);

	return true;
	}
	}