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This plug-in contains the bulk of the Workbench implementation, and depends on JFace, SWT, and Core Runtime. It cannot be used independently from org.eclipse.ui. Workbench client plug-ins should not depend directly on this plug-in.
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/*******************************************************************************
 * Copyright (c) 2005, 2006 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.dialogs;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.preference.IPreferencePage;
import org.eclipse.jface.preference.PreferenceDialog;
import org.eclipse.jface.preference.PreferenceManager;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog;
import org.eclipse.ui.internal.dialogs.PropertyDialog;
import org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog;

/**
 * The PreferencesUtil class is the class that opens a properties or preference
 * dialog on a set of ids.
 * @since 3.1
 */
public final class PreferencesUtil {

	/**
	 * Apply the data to the first page if there is any.
	 * @param data The data to be applied
	 * @param displayedIds  The ids to filter to.
	 * @param dialog The dialog to apply to.
	 */
	private static void applyOptions(Object data, String[] displayedIds,
			FilteredPreferenceDialog dialog) {
		if (data != null) {
			dialog.setPageData(data);
			IPreferencePage page = dialog.getCurrentPage();
			if (page instanceof PreferencePage) {
				((PreferencePage) page).applyData(data);
			}
		}

		if (displayedIds != null) {
			dialog.showOnly(displayedIds);
		}
	}

	/**
	 * Creates a workbench preference dialog and selects particular preference page.
	 * If there is already a preference dialog open this dialog is used and its
	 * selection is set to the page with id preferencePageId.
	 * Show the other pages as filtered results using whatever filtering
	 * criteria the search uses. It is the responsibility of the caller to then
	 * call open(). The call to open() will not
	 * return until the dialog closes, so this is the last chance to manipulate
	 * the dialog.
	 * 
	 * @param shell
	 * 			The Shell to parent the dialog off of if it is not
	 * 			already created. May be null
	 * 			in which case the active workbench window will be used
	 * 			if available.
	 * @param preferencePageId
	 *            The identifier of the preference page to open; may be
	 *            null. If it is null, then the
	 *            preference page is not selected or modified in any way.
	 * @param displayedIds
	 *            The ids of the other pages to be displayed using the same
	 *            filtering criterea as search. If this is null,
	 *            then the all preference pages are shown.
	 * @param data
	 *            Data that will be passed to all of the preference pages to be
	 *            applied as specified within the page as they are created. If
	 *            the data is null nothing will be called.
	 * 
	 * @return a preference dialog.
	 * @since 3.1
	 * @see PreferenceDialog#PreferenceDialog(Shell, PreferenceManager)
	 */
	public static final PreferenceDialog createPreferenceDialogOn(Shell shell,
			String preferencePageId, String[] displayedIds, Object data) {
		FilteredPreferenceDialog dialog = WorkbenchPreferenceDialog.createDialogOn(shell,
				preferencePageId);

		applyOptions(data, displayedIds, dialog);

		return dialog;
	}

	/**
	 * Creates a workbench preference dialog to a particular preference page.
	 * Show the other pages as filtered results using whatever filtering
	 * criteria the search uses. It is the responsibility of the caller to then
	 * call open(). The call to open() will not
	 * return until the dialog closes, so this is the last chance to manipulate
	 * the dialog.
	 * 
	 * @param shell
	 * 			  The shell to use to parent the dialog if required.
	 * @param propertyPageId
	 *            The identifier of the preference page to open; may be
	 *            null. If it is null, then the
	 *            dialog is opened with no selected page.
	 * @param element
	 *            IAdaptable An adaptable element to open the dialog
	 *            on.
	 * @param displayedIds
	 *            The ids of the other pages to be displayed using the same
	 *            filtering criterea as search. If this is null,
	 *            then the all preference pages are shown.
	 * @param data
	 *            Data that will be passed to all of the preference pages to be
	 *            applied as specified within the page as they are created. If
	 *            the data is null nothing will be called.
	 * 
	 * @return A preference dialog showing properties for the selection or
	 *         null if it could not be created.
	 * @since 3.1
	 */
	public static final PreferenceDialog createPropertyDialogOn(Shell shell,
			final IAdaptable element, String propertyPageId, String[] displayedIds, Object data) {

		FilteredPreferenceDialog dialog = PropertyDialog.createDialogOn(shell, propertyPageId,
				element);

		if (dialog == null) {
			return null;
		}

		applyOptions(data, displayedIds, dialog);

		return dialog;

	}

}