bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/dialogs/PerspectivesPreferencePage.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2003 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.dialogs;

 import java.io.IOException;
 import java.util.ArrayList;

 import org.eclipse.core.runtime.Platform;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.preference.*;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.ui.*;
 import org.eclipse.ui.help.WorkbenchHelp;
 import org.eclipse.ui.internal.*;
 import org.eclipse.ui.internal.registry.PerspectiveDescriptor;
 import org.eclipse.ui.internal.registry.PerspectiveRegistry;
 import org.eclipse.ui.plugin.AbstractUIPlugin;

 /**
  * The Workbench / Perspectives preference page.
  */
 public class PerspectivesPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {
 	private IWorkbench workbench;
 	private PerspectiveRegistry perspectiveRegistry;
 	private ArrayList perspectives;
 	private String defaultPerspectiveId;
 	private ArrayList perspToDelete = new ArrayList();
 	private ArrayList perspToRevert = new ArrayList();
 	private List list;
 	private Button revertButton;
 	private Button deleteButton;
 	private Button setDefaultButton;

 	// widgets for open perspective mode;
 	private Button openSameWindowButton;
 	private Button openNewWindowButton;
 	private int openPerspMode;

 	// widgets for open view mode
 	private int openViewMode;
 	private Button openEmbedButton;
 	private Button openFastButton;

 	private RadioGroupFieldEditor projectSwitchField;

 //	private static final int LIST_WIDTH = 200;
 //	private static final int LIST_HEIGHT = 200;

 	// labels
 	private final String PROJECT_SWITCH_PERSP_MODE_TITLE = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.optionsTitle"); //$NON-NLS-1$
 	private final String PSPM_ALWAYS_TEXT = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.always"); //$NON-NLS-1$
 	private final String PSPM_NEVER_TEXT = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.never"); //$NON-NLS-1$
 	private final String PSPM_PROMPT_TEXT = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.prompt"); //$NON-NLS-1$

 	private final String OVM_TITLE = WorkbenchMessages.getString("OpenViewMode.title"); //$NON-NLS-1$
 	private final String OVM_EMBED = WorkbenchMessages.getString("OpenViewMode.embed"); //$NON-NLS-1$
 	private final String OVM_FAST = WorkbenchMessages.getString("OpenViewMode.fast"); //$NON-NLS-1$

 	private final String OPM_TITLE = WorkbenchMessages.getString("OpenPerspectiveMode.optionsTitle"); //$NON-NLS-1$
 	private final String OPM_SAME_WINDOW = WorkbenchMessages.getString("OpenPerspectiveMode.sameWindow"); //$NON-NLS-1$
 	private final String OPM_NEW_WINDOW = WorkbenchMessages.getString("OpenPerspectiveMode.newWindow"); //$NON-NLS-1$

 	/**
 	 * Creates the page's UI content.
 	 */
 	protected Control createContents(Composite parent) {
 		WorkbenchHelp.setHelp(parent, IHelpContextIds.PERSPECTIVES_PREFERENCE_PAGE);

 		Composite pageComponent = new Composite(parent, SWT.NULL);
 		GridData data = new GridData(GridData.FILL_BOTH);
 		pageComponent.setLayoutData(data);
 		pageComponent.setFont(parent.getFont());

 		GridLayout layout = new GridLayout();
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		layout.verticalSpacing = 10;
 		pageComponent.setLayout(layout);

 		createOpenPerspButtonGroup(pageComponent);
 		createOpenViewButtonGroup(pageComponent);
 		createProjectPerspectiveGroup(pageComponent);
 		createCustomizePerspective(pageComponent);

 		return pageComponent;
 	}

 	/**
 	 * Create a composite that contains buttons for selecting
 	 * the open perspective mode.
 	 *
 	 * @param composite Composite
 	 */
 	private void createOpenPerspButtonGroup(Composite composite) {

 		Font font = composite.getFont();

 		Group buttonComposite = new Group(composite, SWT.LEFT);
 		buttonComposite.setText(OPM_TITLE);
 		buttonComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		buttonComposite.setFont(composite.getFont());
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		buttonComposite.setLayout(layout);

 		openSameWindowButton = new Button(buttonComposite, SWT.RADIO);
 		openSameWindowButton.setText(OPM_SAME_WINDOW);
 		openSameWindowButton.setSelection(IPreferenceConstants.OPM_ACTIVE_PAGE == openPerspMode);
 		openSameWindowButton.setFont(font);
 		openSameWindowButton.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				openPerspMode = IPreferenceConstants.OPM_ACTIVE_PAGE;
 			}
 		});

 		openNewWindowButton = new Button(buttonComposite, SWT.RADIO);
 		openNewWindowButton.setText(OPM_NEW_WINDOW);
 		openNewWindowButton.setSelection(IPreferenceConstants.OPM_NEW_WINDOW == openPerspMode);
 		openNewWindowButton.setFont(font);
 		openNewWindowButton.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				openPerspMode = IPreferenceConstants.OPM_NEW_WINDOW;
 			}
 		});

 	}

 	/**
 	 * Create a composite that contains buttons for selecting open view mode.
 	 * @param composite Composite
 	 */
 	private void createOpenViewButtonGroup(Composite composite) {

 		Font font = composite.getFont();

 		Group buttonComposite = new Group(composite, SWT.LEFT);
 		buttonComposite.setText(OVM_TITLE);
 		buttonComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		buttonComposite.setFont(composite.getFont());
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		buttonComposite.setLayout(layout);

 		openEmbedButton = new Button(buttonComposite, SWT.RADIO);
 		openEmbedButton.setText(OVM_EMBED);
 		openEmbedButton.setSelection(
 			openViewMode == IPreferenceConstants.OVM_EMBED);
 		openEmbedButton.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				openViewMode = IPreferenceConstants.OVM_EMBED;
 			}
 		});
 		openEmbedButton.setFont(font);

 		// Open view as float no longer supported
 		if (openViewMode == IPreferenceConstants.OVM_FLOAT)
 			openViewMode = IPreferenceConstants.OVM_FAST;

 		openFastButton = new Button(buttonComposite, SWT.RADIO);
 		openFastButton.setText(OVM_FAST);
 		openFastButton.setSelection(
 			openViewMode == IPreferenceConstants.OVM_FAST);
 		openFastButton.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				openViewMode = IPreferenceConstants.OVM_FAST;
 			}
 		});
 		openFastButton.setFont(font);

 	}

 	/**
 	 * Create a composite that contains buttons for selecting the
 	 * preference opening new project selections.
 	 */
 	private void createProjectPerspectiveGroup(Composite composite) {

 		Composite projectComposite = new Composite(composite, SWT.NONE);
 		projectComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		projectComposite.setFont(composite.getFont());

 		String[][] namesAndValues = {
 			{PSPM_ALWAYS_TEXT, IPreferenceConstants.PSPM_ALWAYS},
 			{PSPM_NEVER_TEXT, IPreferenceConstants.PSPM_NEVER},
 			{PSPM_PROMPT_TEXT, IPreferenceConstants.PSPM_PROMPT}
 		};
 		projectSwitchField =
 			new RadioGroupFieldEditor(
 				IPreferenceConstants.PROJECT_SWITCH_PERSP_MODE,
 				PROJECT_SWITCH_PERSP_MODE_TITLE,
 				namesAndValues.length,
 				namesAndValues,
 				projectComposite,
 				true);
 		projectSwitchField.setPreferenceStore(getPreferenceStore());
 		projectSwitchField.setPreferencePage(this);
 		projectSwitchField.load();
 	}
 	/**
 	 * Create a table a 3 buttons to enable the user to manage customized
 	 * perspectives.
 	 */
 	protected Composite createCustomizePerspective(Composite parent) {

 		Font font = parent.getFont();

 		// define container & its gridding
 		Composite perspectivesComponent = new Composite(parent, SWT.NONE);
 		perspectivesComponent.setLayoutData(new GridData(GridData.FILL_BOTH));
 		perspectivesComponent.setFont(parent.getFont());

 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		perspectivesComponent.setLayout(layout);

 		// Add the label
 		Label label = new Label(perspectivesComponent, SWT.LEFT);
 		label.setText(WorkbenchMessages.getString("PerspectivesPreference.available")); //$NON-NLS-1$
 		GridData data = new GridData();
 		data.horizontalSpan = 2;
 		label.setLayoutData(data);
 		label.setFont(font);

 		// Add perspective list.
 		list = new List(perspectivesComponent, SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
 		list.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				updateButtons();
 			}
 		});

 		list.setFont(font);

 		data = new GridData(GridData.FILL_BOTH);
 		data.grabExcessHorizontalSpace = true;
 		data.grabExcessVerticalSpace = true;
 		list.setLayoutData(data);

 		// Populate the perspective list
 		IPerspectiveDescriptor[] persps = perspectiveRegistry.getPerspectives();
 		perspectives = new ArrayList(persps.length);
 		for (int i = 0; i < persps.length; i++)
 			perspectives.add(i, persps[i]);
 		defaultPerspectiveId = perspectiveRegistry.getDefaultPerspective();
 		updateList();

 		// Create vertical button bar.
 		Composite buttonBar =
 			(Composite) createVerticalButtonBar(perspectivesComponent);
 		data = new GridData(GridData.FILL_VERTICAL);
 		buttonBar.setLayoutData(data);
 		return perspectivesComponent;
 	}

 	/**
 	 * Creates a new vertical button with the given id.
 	 * <p>
 	 * The default implementation of this framework method
 	 * creates a standard push button, registers for selection events
 	 * including button presses and help requests, and registers
 	 * default buttons with its shell.
 	 * The button id is stored as the buttons client data.
 	 * </p>
 	 *
 	 * @param parent the parent composite
 	 * @param buttonId the id of the button (see
 	 *  <code>IDialogConstants.*_ID</code> constants
 	 *  for standard dialog button ids)
 	 * @param label the label from the button
 	 * @param defaultButton <code>true</code> if the button is to be the
 	 *   default button, and <code>false</code> otherwise
 	 */
 	protected Button createVerticalButton(
 		Composite parent,
 		String label,
 		boolean defaultButton) {
 		Button button = new Button(parent, SWT.PUSH);

 		button.setText(label);

 		GridData data = setButtonLayoutData(button);
 		data.horizontalAlignment = GridData.FILL;

 		button.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent event) {
 				verticalButtonPressed(event.widget);
 			}
 		});
 		button.setToolTipText(label);
 		if (defaultButton) {
 			Shell shell = parent.getShell();
 			if (shell != null) {
 				shell.setDefaultButton(button);
 			}
 		}
 		button.setFont(parent.getFont());
 		return button;
 	}

 	/**
 	 * Creates and returns the vertical button bar.
 	 *
 	 * @param parent the parent composite to contain the button bar
 	 * @return the button bar control
 	 */
 	protected Control createVerticalButtonBar(Composite parent) {
 		// Create composite.
 		Composite composite = new Composite(parent, SWT.NULL);

 		// create a layout with spacing and margins appropriate for the font size.
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 1;
 		layout.marginWidth = 5;
 		layout.marginHeight = 0;
 		layout.horizontalSpacing =
 			convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
 		layout.verticalSpacing =
 			convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);
 		composite.setLayout(layout);
 		composite.setFont(parent.getFont());

 		// Add the buttons to the button bar.
 		setDefaultButton = createVerticalButton(composite, WorkbenchMessages.getString("PerspectivesPreference.MakeDefault"), false); //$NON-NLS-1$
 		setDefaultButton.setToolTipText(WorkbenchMessages.getString("PerspectivesPreference.MakeDefaultTip")); //$NON-NLS-1$

 		revertButton = createVerticalButton(composite, WorkbenchMessages.getString("PerspectivesPreference.Reset"), false); //$NON-NLS-1$
 		revertButton.setToolTipText(WorkbenchMessages.getString("PerspectivesPreference.ResetTip")); //$NON-NLS-1$

 		deleteButton = createVerticalButton(composite, WorkbenchMessages.getString("PerspectivesPreference.Delete"), false); //$NON-NLS-1$
 		deleteButton.setToolTipText(WorkbenchMessages.getString("PerspectivesPreference.DeleteTip")); //$NON-NLS-1$
 		updateButtons();

 		return composite;
 	}

 	/**
 	 * @see IWorkbenchPreferencePage
 	 */
 	public void init(IWorkbench aWorkbench) {
 		this.workbench = aWorkbench;
 		this.perspectiveRegistry = (PerspectiveRegistry) workbench.getPerspectiveRegistry();
 		IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();
 		setPreferenceStore(store);

 		openViewMode = store.getInt(IPreferenceConstants.OPEN_VIEW_MODE);
 		openPerspMode = store.getInt(IPreferenceConstants.OPEN_PERSP_MODE);
 	}

 	/**
 	 * Get the preference store for the API constants (those in
 	 * IWorkbenchPreferenceConstants).
 	 * @return IPreferenceStore
 	 */

 	private IPreferenceStore getUIPublicPreferenceStore() {
 		AbstractUIPlugin uiPlugin =
 			(AbstractUIPlugin) Platform.getPlugin(PlatformUI.PLUGIN_ID);
 		return uiPlugin.getPreferenceStore();
 	}

 	/**
 	 * The default button has been pressed.
 	 */
 	protected void performDefaults() {
 		//Project perspective preferences
 		IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();

 		projectSwitchField.loadDefault();

 		openViewMode = store.getDefaultInt(IPreferenceConstants.OPEN_VIEW_MODE);
 		// Open view as float no longer supported
 		if (openViewMode == IPreferenceConstants.OVM_FLOAT)
 			openViewMode = IPreferenceConstants.OVM_FAST;
 		openEmbedButton.setSelection(openViewMode == IPreferenceConstants.OVM_EMBED);
 		openFastButton.setSelection(openViewMode == IPreferenceConstants.OVM_FAST);

 		openPerspMode = store.getDefaultInt(IPreferenceConstants.OPEN_PERSP_MODE);
 		openSameWindowButton.setSelection(IPreferenceConstants.OPM_ACTIVE_PAGE == openPerspMode);
 		openNewWindowButton.setSelection(IPreferenceConstants.OPM_NEW_WINDOW == openPerspMode);
 	}
 	/*
 	 * Delete the perspectives selected by the user if there is not
 	 * opened instance of that perspective.
 	 */

 	private boolean deletePerspectives() {
 		IWorkbenchWindow windows[] = workbench.getWorkbenchWindows();
 		for (int i = 0; i < windows.length; i++) {
 			IWorkbenchPage pages[] = windows[i].getPages();
 			for (int j = 0; j < pages.length; j++) {
 				WorkbenchPage page = (WorkbenchPage)pages[j];
 				for (int k = 0; k < perspToDelete.size(); k++) {
 					IPerspectiveDescriptor desc = (IPerspectiveDescriptor)perspToDelete.get(k);
 					if(page.findPerspective(desc) != null) {
 						MessageDialog.openInformation(
 							getShell(),
 							WorkbenchMessages.getString("PerspectivesPreference.cannotdelete.title"), //$NON-NLS-1$
 							WorkbenchMessages.format("PerspectivesPreference.cannotdelete.message", new String[]{desc.getLabel()})); //$NON-NLS-1$
 						return false;
 					}
 				}
 			}
 		}

 		//Delete the perspectives from the registry
 		perspectiveRegistry.deletePerspectives(perspToDelete);
 		return true;
 	}
 	/**
 	 * Apply the user's changes if any
 	 */
 	public boolean performOk() {
 		// Set the default perspective
 		if (!defaultPerspectiveId
 			.equals(perspectiveRegistry.getDefaultPerspective()))
 			perspectiveRegistry.setDefaultPerspective(defaultPerspectiveId);

 		if(!deletePerspectives())
 			return false;

 		// Revert the perspectives
 		perspectiveRegistry.revertPerspectives(perspToRevert);

 		// Update perspective history.
 		 ((Workbench) workbench).getPerspectiveHistory().refreshFromRegistry();

 		// store the open new project perspective settings
 		projectSwitchField.store();
 		IPreferenceStore store = getPreferenceStore();
 		String pspm = store.getString(IPreferenceConstants.PROJECT_SWITCH_PERSP_MODE);
 		String newProjectPerspectiveSetting;
 		if (IPreferenceConstants.PSPM_NEVER.equals(pspm)) {
 			newProjectPerspectiveSetting = IWorkbenchPreferenceConstants.NO_NEW_PERSPECTIVE;
 		}
 		else { // PSPM_ALWAYS or PSPM_PROMPT
 			if(openPerspMode == IPreferenceConstants.OPM_NEW_WINDOW)
 				newProjectPerspectiveSetting = IWorkbenchPreferenceConstants.OPEN_PERSPECTIVE_WINDOW;
 			else
 				newProjectPerspectiveSetting = IWorkbenchPreferenceConstants.OPEN_PERSPECTIVE_REPLACE;
 		}
 		getUIPublicPreferenceStore().setValue(
 			IWorkbenchPreferenceConstants.PROJECT_OPEN_NEW_PERSPECTIVE,
 			newProjectPerspectiveSetting);

 		// store the open view mode setting
 		store.setValue(IPreferenceConstants.OPEN_VIEW_MODE, openViewMode);

 		// store the open perspective mode setting
 		store.setValue(IPreferenceConstants.OPEN_PERSP_MODE, openPerspMode);

 		WorkbenchPlugin.getDefault().savePluginPreferences();
 		try {
 			((IPersistentPreferenceStore) getUIPublicPreferenceStore()).save();
 		}
 		catch (IOException e) {
 			WorkbenchPlugin.log("Error saving UI preference store in PerspectivesPreferencePage.performOK(): " + e); //$NON-NLS-1$
 		}
 		return true;
 	}

 	/**
 	 * Update the button enablement state.
 	 */
 	protected void updateButtons() {
 		// Get selection.
 		int index = list.getSelectionIndex();

 		// Map it to the perspective descriptor
 		PerspectiveDescriptor desc = null;
 		if (index > -1)
 			desc = (PerspectiveDescriptor) perspectives.get(index);

 		// Do enable.
 		if (desc != null) {
 			revertButton.setEnabled(
 				desc.isPredefined()
 					&& desc.hasCustomDefinition()
 					&& !perspToRevert.contains(desc));
 			deleteButton.setEnabled(!desc.isPredefined());
 			setDefaultButton.setEnabled(true);
 		} else {
 			revertButton.setEnabled(false);
 			deleteButton.setEnabled(false);
 			setDefaultButton.setEnabled(false);
 		}
 	}

 	/**
 	 * Update the list items.
 	 */
 	protected void updateList() {
 		list.removeAll();
 		for (int i = 0; i < perspectives.size(); i++) {
 			IPerspectiveDescriptor desc =
 				(IPerspectiveDescriptor) perspectives.get(i);
 			String label = desc.getLabel();
 			if (desc.getId().equals(defaultPerspectiveId))
 				label = WorkbenchMessages.format("PerspectivesPreference.defaultLabel", new Object[] { label }); //$NON-NLS-1$
 			list.add(label, i);
 		}
 	}

 	/**
 	 * Notifies that this page's button with the given id has been pressed.
 	 *
 	 * @param buttonId the id of the button that was pressed (see
 	 *  <code>IDialogConstants.*_ID</code> constants)
 	 */
 	protected void verticalButtonPressed(Widget button) {
 		// Get selection.
 		int index = list.getSelectionIndex();

 		// Map it to the perspective descriptor
 		PerspectiveDescriptor desc = null;
 		if (index > -1)
 			desc = (PerspectiveDescriptor) perspectives.get(index);
 		else
 			return;

 		// Take action.
 		if (button == revertButton) {
 			if (desc.isPredefined() && !perspToRevert.contains(desc)) {
 				perspToRevert.add(desc);
 			}
 		} else if (button == deleteButton) {
 			if (!desc.isPredefined() && !perspToDelete.contains(desc)) {
 				perspToDelete.add(desc);
 				perspToRevert.remove(desc);
 				perspectives.remove(desc);
 				updateList();
 			}
 		} else if (button == setDefaultButton) {
 			defaultPerspectiveId = desc.getId();
 			updateList();
 			list.setSelection(index);
 		}

 		updateButtons();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2003 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Common Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/cpl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/

	package org.eclipse.ui.internal.dialogs;

	import java.io.IOException;
	import java.util.ArrayList;

	import org.eclipse.core.runtime.Platform;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.preference.*;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.*;
	import org.eclipse.ui.*;
	import org.eclipse.ui.help.WorkbenchHelp;
	import org.eclipse.ui.internal.*;
	import org.eclipse.ui.internal.registry.PerspectiveDescriptor;
	import org.eclipse.ui.internal.registry.PerspectiveRegistry;
	import org.eclipse.ui.plugin.AbstractUIPlugin;

	/**
	* The Workbench / Perspectives preference page.
	*/
	public class PerspectivesPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {
	private IWorkbench workbench;
	private PerspectiveRegistry perspectiveRegistry;
	private ArrayList perspectives;
	private String defaultPerspectiveId;
	private ArrayList perspToDelete = new ArrayList();
	private ArrayList perspToRevert = new ArrayList();
	private List list;
	private Button revertButton;
	private Button deleteButton;
	private Button setDefaultButton;

	// widgets for open perspective mode;
	private Button openSameWindowButton;
	private Button openNewWindowButton;
	private int openPerspMode;

	// widgets for open view mode
	private int openViewMode;
	private Button openEmbedButton;
	private Button openFastButton;

	private RadioGroupFieldEditor projectSwitchField;

	// private static final int LIST_WIDTH = 200;
	// private static final int LIST_HEIGHT = 200;

	// labels
	private final String PROJECT_SWITCH_PERSP_MODE_TITLE = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.optionsTitle"); //$NON-NLS-1$
	private final String PSPM_ALWAYS_TEXT = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.always"); //$NON-NLS-1$
	private final String PSPM_NEVER_TEXT = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.never"); //$NON-NLS-1$
	private final String PSPM_PROMPT_TEXT = WorkbenchMessages.getString("ProjectSwitchPerspectiveMode.prompt"); //$NON-NLS-1$

	private final String OVM_TITLE = WorkbenchMessages.getString("OpenViewMode.title"); //$NON-NLS-1$
	private final String OVM_EMBED = WorkbenchMessages.getString("OpenViewMode.embed"); //$NON-NLS-1$
	private final String OVM_FAST = WorkbenchMessages.getString("OpenViewMode.fast"); //$NON-NLS-1$

	private final String OPM_TITLE = WorkbenchMessages.getString("OpenPerspectiveMode.optionsTitle"); //$NON-NLS-1$
	private final String OPM_SAME_WINDOW = WorkbenchMessages.getString("OpenPerspectiveMode.sameWindow"); //$NON-NLS-1$
	private final String OPM_NEW_WINDOW = WorkbenchMessages.getString("OpenPerspectiveMode.newWindow"); //$NON-NLS-1$

	/**
	* Creates the page's UI content.
	*/
	protected Control createContents(Composite parent) {
	WorkbenchHelp.setHelp(parent, IHelpContextIds.PERSPECTIVES_PREFERENCE_PAGE);

	Composite pageComponent = new Composite(parent, SWT.NULL);
	GridData data = new GridData(GridData.FILL_BOTH);
	pageComponent.setLayoutData(data);
	pageComponent.setFont(parent.getFont());

	GridLayout layout = new GridLayout();
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	layout.verticalSpacing = 10;
	pageComponent.setLayout(layout);

	createOpenPerspButtonGroup(pageComponent);
	createOpenViewButtonGroup(pageComponent);
	createProjectPerspectiveGroup(pageComponent);
	createCustomizePerspective(pageComponent);

	return pageComponent;
	}

	/**
	* Create a composite that contains buttons for selecting
	* the open perspective mode.
	*
	* @param composite Composite
	*/
	private void createOpenPerspButtonGroup(Composite composite) {

	Font font = composite.getFont();

	Group buttonComposite = new Group(composite, SWT.LEFT);
	buttonComposite.setText(OPM_TITLE);
	buttonComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	buttonComposite.setFont(composite.getFont());
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	buttonComposite.setLayout(layout);

	openSameWindowButton = new Button(buttonComposite, SWT.RADIO);
	openSameWindowButton.setText(OPM_SAME_WINDOW);
	openSameWindowButton.setSelection(IPreferenceConstants.OPM_ACTIVE_PAGE == openPerspMode);
	openSameWindowButton.setFont(font);
	openSameWindowButton.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	openPerspMode = IPreferenceConstants.OPM_ACTIVE_PAGE;
	}
	});

	openNewWindowButton = new Button(buttonComposite, SWT.RADIO);
	openNewWindowButton.setText(OPM_NEW_WINDOW);
	openNewWindowButton.setSelection(IPreferenceConstants.OPM_NEW_WINDOW == openPerspMode);
	openNewWindowButton.setFont(font);
	openNewWindowButton.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	openPerspMode = IPreferenceConstants.OPM_NEW_WINDOW;
	}
	});

	}

	/**
	* Create a composite that contains buttons for selecting open view mode.
	* @param composite Composite
	*/
	private void createOpenViewButtonGroup(Composite composite) {

	Font font = composite.getFont();

	Group buttonComposite = new Group(composite, SWT.LEFT);
	buttonComposite.setText(OVM_TITLE);
	buttonComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	buttonComposite.setFont(composite.getFont());
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	buttonComposite.setLayout(layout);

	openEmbedButton = new Button(buttonComposite, SWT.RADIO);
	openEmbedButton.setText(OVM_EMBED);
	openEmbedButton.setSelection(
	openViewMode == IPreferenceConstants.OVM_EMBED);
	openEmbedButton.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	openViewMode = IPreferenceConstants.OVM_EMBED;
	}
	});
	openEmbedButton.setFont(font);

	// Open view as float no longer supported
	if (openViewMode == IPreferenceConstants.OVM_FLOAT)
	openViewMode = IPreferenceConstants.OVM_FAST;

	openFastButton = new Button(buttonComposite, SWT.RADIO);
	openFastButton.setText(OVM_FAST);
	openFastButton.setSelection(
	openViewMode == IPreferenceConstants.OVM_FAST);
	openFastButton.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	openViewMode = IPreferenceConstants.OVM_FAST;
	}
	});
	openFastButton.setFont(font);

	}

	/**
	* Create a composite that contains buttons for selecting the
	* preference opening new project selections.
	*/
	private void createProjectPerspectiveGroup(Composite composite) {

	Composite projectComposite = new Composite(composite, SWT.NONE);
	projectComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	projectComposite.setFont(composite.getFont());

	String[][] namesAndValues = {
	{PSPM_ALWAYS_TEXT, IPreferenceConstants.PSPM_ALWAYS},
	{PSPM_NEVER_TEXT, IPreferenceConstants.PSPM_NEVER},
	{PSPM_PROMPT_TEXT, IPreferenceConstants.PSPM_PROMPT}
	};
	projectSwitchField =
	new RadioGroupFieldEditor(
	IPreferenceConstants.PROJECT_SWITCH_PERSP_MODE,
	PROJECT_SWITCH_PERSP_MODE_TITLE,
	namesAndValues.length,
	namesAndValues,
	projectComposite,
	true);
	projectSwitchField.setPreferenceStore(getPreferenceStore());
	projectSwitchField.setPreferencePage(this);
	projectSwitchField.load();
	}
	/**
	* Create a table a 3 buttons to enable the user to manage customized
	* perspectives.
	*/
	protected Composite createCustomizePerspective(Composite parent) {

	Font font = parent.getFont();

	// define container & its gridding
	Composite perspectivesComponent = new Composite(parent, SWT.NONE);
	perspectivesComponent.setLayoutData(new GridData(GridData.FILL_BOTH));
	perspectivesComponent.setFont(parent.getFont());

	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	perspectivesComponent.setLayout(layout);

	// Add the label
	Label label = new Label(perspectivesComponent, SWT.LEFT);
	label.setText(WorkbenchMessages.getString("PerspectivesPreference.available")); //$NON-NLS-1$
	GridData data = new GridData();
	data.horizontalSpan = 2;
	label.setLayoutData(data);
	label.setFont(font);

	// Add perspective list.
	list = new List(perspectivesComponent, SWT.H_SCROLL \| SWT.V_SCROLL \| SWT.BORDER);
	list.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	updateButtons();
	}
	});

	list.setFont(font);

	data = new GridData(GridData.FILL_BOTH);
	data.grabExcessHorizontalSpace = true;
	data.grabExcessVerticalSpace = true;
	list.setLayoutData(data);

	// Populate the perspective list
	IPerspectiveDescriptor[] persps = perspectiveRegistry.getPerspectives();
	perspectives = new ArrayList(persps.length);
	for (int i = 0; i < persps.length; i++)
	perspectives.add(i, persps[i]);
	defaultPerspectiveId = perspectiveRegistry.getDefaultPerspective();
	updateList();

	// Create vertical button bar.
	Composite buttonBar =
	(Composite) createVerticalButtonBar(perspectivesComponent);
	data = new GridData(GridData.FILL_VERTICAL);
	buttonBar.setLayoutData(data);
	return perspectivesComponent;
	}

	/**
	* Creates a new vertical button with the given id.
	* <p>
	* The default implementation of this framework method
	* creates a standard push button, registers for selection events
	* including button presses and help requests, and registers
	* default buttons with its shell.
	* The button id is stored as the buttons client data.
	* </p>
	*
	* @param parent the parent composite
	* @param buttonId the id of the button (see
	* <code>IDialogConstants.*_ID</code> constants
	* for standard dialog button ids)
	* @param label the label from the button
	* @param defaultButton <code>true</code> if the button is to be the
	* default button, and <code>false</code> otherwise
	*/
	protected Button createVerticalButton(
	Composite parent,
	String label,
	boolean defaultButton) {
	Button button = new Button(parent, SWT.PUSH);

	button.setText(label);

	GridData data = setButtonLayoutData(button);
	data.horizontalAlignment = GridData.FILL;

	button.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	verticalButtonPressed(event.widget);
	}
	});
	button.setToolTipText(label);
	if (defaultButton) {
	Shell shell = parent.getShell();
	if (shell != null) {
	shell.setDefaultButton(button);
	}
	}
	button.setFont(parent.getFont());
	return button;
	}

	/**
	* Creates and returns the vertical button bar.
	*
	* @param parent the parent composite to contain the button bar
	* @return the button bar control
	*/
	protected Control createVerticalButtonBar(Composite parent) {
	// Create composite.
	Composite composite = new Composite(parent, SWT.NULL);

	// create a layout with spacing and margins appropriate for the font size.
	GridLayout layout = new GridLayout();
	layout.numColumns = 1;
	layout.marginWidth = 5;
	layout.marginHeight = 0;
	layout.horizontalSpacing =
	convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
	layout.verticalSpacing =
	convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);
	composite.setLayout(layout);
	composite.setFont(parent.getFont());

	// Add the buttons to the button bar.
	setDefaultButton = createVerticalButton(composite, WorkbenchMessages.getString("PerspectivesPreference.MakeDefault"), false); //$NON-NLS-1$
	setDefaultButton.setToolTipText(WorkbenchMessages.getString("PerspectivesPreference.MakeDefaultTip")); //$NON-NLS-1$

	revertButton = createVerticalButton(composite, WorkbenchMessages.getString("PerspectivesPreference.Reset"), false); //$NON-NLS-1$
	revertButton.setToolTipText(WorkbenchMessages.getString("PerspectivesPreference.ResetTip")); //$NON-NLS-1$

	deleteButton = createVerticalButton(composite, WorkbenchMessages.getString("PerspectivesPreference.Delete"), false); //$NON-NLS-1$
	deleteButton.setToolTipText(WorkbenchMessages.getString("PerspectivesPreference.DeleteTip")); //$NON-NLS-1$
	updateButtons();

	return composite;
	}

	/**
	* @see IWorkbenchPreferencePage
	*/
	public void init(IWorkbench aWorkbench) {
	this.workbench = aWorkbench;
	this.perspectiveRegistry = (PerspectiveRegistry) workbench.getPerspectiveRegistry();
	IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();
	setPreferenceStore(store);

	openViewMode = store.getInt(IPreferenceConstants.OPEN_VIEW_MODE);
	openPerspMode = store.getInt(IPreferenceConstants.OPEN_PERSP_MODE);
	}

	/**
	* Get the preference store for the API constants (those in
	* IWorkbenchPreferenceConstants).
	* @return IPreferenceStore
	*/

	private IPreferenceStore getUIPublicPreferenceStore() {
	AbstractUIPlugin uiPlugin =
	(AbstractUIPlugin) Platform.getPlugin(PlatformUI.PLUGIN_ID);
	return uiPlugin.getPreferenceStore();
	}

	/**
	* The default button has been pressed.
	*/
	protected void performDefaults() {
	//Project perspective preferences
	IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();

	projectSwitchField.loadDefault();

	openViewMode = store.getDefaultInt(IPreferenceConstants.OPEN_VIEW_MODE);
	// Open view as float no longer supported
	if (openViewMode == IPreferenceConstants.OVM_FLOAT)
	openViewMode = IPreferenceConstants.OVM_FAST;
	openEmbedButton.setSelection(openViewMode == IPreferenceConstants.OVM_EMBED);
	openFastButton.setSelection(openViewMode == IPreferenceConstants.OVM_FAST);

	openPerspMode = store.getDefaultInt(IPreferenceConstants.OPEN_PERSP_MODE);
	openSameWindowButton.setSelection(IPreferenceConstants.OPM_ACTIVE_PAGE == openPerspMode);
	openNewWindowButton.setSelection(IPreferenceConstants.OPM_NEW_WINDOW == openPerspMode);
	}
	/*
	* Delete the perspectives selected by the user if there is not
	* opened instance of that perspective.
	*/

	private boolean deletePerspectives() {
	IWorkbenchWindow windows[] = workbench.getWorkbenchWindows();
	for (int i = 0; i < windows.length; i++) {
	IWorkbenchPage pages[] = windows[i].getPages();
	for (int j = 0; j < pages.length; j++) {
	WorkbenchPage page = (WorkbenchPage)pages[j];
	for (int k = 0; k < perspToDelete.size(); k++) {
	IPerspectiveDescriptor desc = (IPerspectiveDescriptor)perspToDelete.get(k);
	if(page.findPerspective(desc) != null) {
	MessageDialog.openInformation(
	getShell(),
	WorkbenchMessages.getString("PerspectivesPreference.cannotdelete.title"), //$NON-NLS-1$
	WorkbenchMessages.format("PerspectivesPreference.cannotdelete.message", new String[]{desc.getLabel()})); //$NON-NLS-1$
	return false;
	}
	}
	}
	}

	//Delete the perspectives from the registry
	perspectiveRegistry.deletePerspectives(perspToDelete);
	return true;
	}
	/**
	* Apply the user's changes if any
	*/
	public boolean performOk() {
	// Set the default perspective
	if (!defaultPerspectiveId
	.equals(perspectiveRegistry.getDefaultPerspective()))
	perspectiveRegistry.setDefaultPerspective(defaultPerspectiveId);

	if(!deletePerspectives())
	return false;

	// Revert the perspectives
	perspectiveRegistry.revertPerspectives(perspToRevert);

	// Update perspective history.
	((Workbench) workbench).getPerspectiveHistory().refreshFromRegistry();

	// store the open new project perspective settings
	projectSwitchField.store();
	IPreferenceStore store = getPreferenceStore();
	String pspm = store.getString(IPreferenceConstants.PROJECT_SWITCH_PERSP_MODE);
	String newProjectPerspectiveSetting;
	if (IPreferenceConstants.PSPM_NEVER.equals(pspm)) {
	newProjectPerspectiveSetting = IWorkbenchPreferenceConstants.NO_NEW_PERSPECTIVE;
	}
	else { // PSPM_ALWAYS or PSPM_PROMPT
	if(openPerspMode == IPreferenceConstants.OPM_NEW_WINDOW)
	newProjectPerspectiveSetting = IWorkbenchPreferenceConstants.OPEN_PERSPECTIVE_WINDOW;
	else
	newProjectPerspectiveSetting = IWorkbenchPreferenceConstants.OPEN_PERSPECTIVE_REPLACE;
	}
	getUIPublicPreferenceStore().setValue(
	IWorkbenchPreferenceConstants.PROJECT_OPEN_NEW_PERSPECTIVE,
	newProjectPerspectiveSetting);

	// store the open view mode setting
	store.setValue(IPreferenceConstants.OPEN_VIEW_MODE, openViewMode);

	// store the open perspective mode setting
	store.setValue(IPreferenceConstants.OPEN_PERSP_MODE, openPerspMode);

	WorkbenchPlugin.getDefault().savePluginPreferences();
	try {
	((IPersistentPreferenceStore) getUIPublicPreferenceStore()).save();
	}
	catch (IOException e) {
	WorkbenchPlugin.log("Error saving UI preference store in PerspectivesPreferencePage.performOK(): " + e); //$NON-NLS-1$
	}
	return true;
	}

	/**
	* Update the button enablement state.
	*/
	protected void updateButtons() {
	// Get selection.
	int index = list.getSelectionIndex();

	// Map it to the perspective descriptor
	PerspectiveDescriptor desc = null;
	if (index > -1)
	desc = (PerspectiveDescriptor) perspectives.get(index);

	// Do enable.
	if (desc != null) {
	revertButton.setEnabled(
	desc.isPredefined()
	&& desc.hasCustomDefinition()
	&& !perspToRevert.contains(desc));
	deleteButton.setEnabled(!desc.isPredefined());
	setDefaultButton.setEnabled(true);
	} else {
	revertButton.setEnabled(false);
	deleteButton.setEnabled(false);
	setDefaultButton.setEnabled(false);
	}
	}

	/**
	* Update the list items.
	*/
	protected void updateList() {
	list.removeAll();
	for (int i = 0; i < perspectives.size(); i++) {
	IPerspectiveDescriptor desc =
	(IPerspectiveDescriptor) perspectives.get(i);
	String label = desc.getLabel();
	if (desc.getId().equals(defaultPerspectiveId))
	label = WorkbenchMessages.format("PerspectivesPreference.defaultLabel", new Object[] { label }); //$NON-NLS-1$
	list.add(label, i);
	}
	}

	/**
	* Notifies that this page's button with the given id has been pressed.
	*
	* @param buttonId the id of the button that was pressed (see
	* <code>IDialogConstants.*_ID</code> constants)
	*/
	protected void verticalButtonPressed(Widget button) {
	// Get selection.
	int index = list.getSelectionIndex();

	// Map it to the perspective descriptor
	PerspectiveDescriptor desc = null;
	if (index > -1)
	desc = (PerspectiveDescriptor) perspectives.get(index);
	else
	return;

	// Take action.
	if (button == revertButton) {
	if (desc.isPredefined() && !perspToRevert.contains(desc)) {
	perspToRevert.add(desc);
	}
	} else if (button == deleteButton) {
	if (!desc.isPredefined() && !perspToDelete.contains(desc)) {
	perspToDelete.add(desc);
	perspToRevert.remove(desc);
	perspectives.remove(desc);
	updateList();
	}
	} else if (button == setDefaultButton) {
	defaultPerspectiveId = desc.getId();
	updateList();
	list.setSelection(index);
	}

	updateButtons();
	}
	}