/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.part;

import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.TabFolder;

/**
 * Abstract superclass of all multi-page workbench editors.
 * <p>
 * This class should be subclassed by clients wishing to define new multi-page
 * editor.
 * </p>
 * <p>
 * Subclasses must implement the following methods:
 * </p>
 * <ul>
 * <li><code>createPartControl</code> - to create the view's controls</li>
 * <li><code>setFocus</code> - to accept focus</li>
 * <li><code>isDirty</code> - to decide whether a significant change has
 * occurred</li>
 * <li><code>doSave</code> - to save contents of editor</li>
 * <li><code>doSaveAs</code> - to save contents of editor</li>
 * </ul>
 * <p>
 * Subclasses may extend or reimplement the following methods as required:
 * </p>
 * <ul>
 * <li><code>setInitializationData</code> - extend to provide additional
 * initialization when editor extension is instantiated</li>
 * <li><code>init(IEditorSite,IEditorInput)</code> - extend to provide
 * additional initialization when editor is assigned its site</li>
 * <li><code>isSaveOnCloseNeeded</code> - override to control saving</li>
 * <li><code>isSaveAsAllowed</code> - override to control saving</li>
 * <li><code>gotoMarker</code> - reimplement to make selections based on
 * markers</li>
 * <li><code>dispose</code> - extend to provide additional cleanup</li>
 * <li><code>getAdapter</code> - reimplement to make their editor adaptable</li>
 * </ul>
 *
 * @deprecated Use the class <code>MultiPageEditorPart</code> instead
 *
 * @noextend This class is not intended to be subclassed by clients.
 * @noreference This class is not intended to be referenced by clients.
 *
 *              Marked for deletion see Bug 547018.
 *
 */
@Deprecated(forRemoval = true)
public abstract class MultiPageEditor extends EditorPart {
	private List<PageBook> syncVector;

	private TabFolder tabFolder;

	/**
	 * Creates a new multi-page editor.
	 *
	 * @deprecated Use the class <code>MultiPageEditorPart</code> instead
	 */
	@Deprecated
	public MultiPageEditor() {
		super();
	}

	/**
	 * Adds a synchronized pagebook to this editor. Once added, the visible page of
	 * the pagebook and the visible page of the editor will be synchronized.
	 *
	 * @param pageBook the pagebook to add
	 */
	protected void addSyncroPageBook(PageBook pageBook) {
		// Add the page.
		if (syncVector == null) {
			syncVector = new ArrayList<>(1);
		}
		syncVector.add(pageBook);

		// Set the visible page.
		syncPageBook(pageBook);
	}

	/**
	 * The <code>MultiPageEditor</code> implementation of this
	 * <code>IWorkbenchPart</code> method creates a <code>TabFolder</code> control.
	 */
	@Override
	public void createPartControl(Composite parent) {
		tabFolder = new TabFolder(parent, SWT.NONE);
		tabFolder.addSelectionListener(widgetSelectedAdapter(e -> sync()));
	}

	/**
	 * Returns this editor's workbook.
	 *
	 * @return the editor workbook
	 */
	protected TabFolder getFolder() {
		return tabFolder;
	}

	/**
	 * Indicates that a page change has occurred. Updates the sync vector.
	 */
	protected void onPageChange() {
		if (syncVector != null) {
			Iterator<PageBook> itr = syncVector.iterator();
			while (itr.hasNext()) {
				PageBook pageBook = itr.next();
				syncPageBook(pageBook);
			}
		}
	}

	/**
	 * Removes a synchronized pagebook from this editor.
	 *
	 * @param pageBook the pagebook to remove
	 * @see #addSyncroPageBook(PageBook)
	 */
	protected void removeSyncroPageBook(PageBook pageBook) {
		if (syncVector != null) {
			syncVector.remove(pageBook);
		}
		pageBook.dispose();
	}

	/**
	 * Synchronizes each registered pagebook with the editor page.
	 */
	protected void sync() {
		if (syncVector != null) {
			Iterator<PageBook> itr = syncVector.iterator();
			while (itr.hasNext()) {
				PageBook pageBook = itr.next();
				syncPageBook(pageBook);
			}
		}
	}

	/**
	 * Sets the visible page of the given pagebook to be the same as the visible
	 * page of this editor.
	 *
	 * @param pageBook a pagebook to synchronize
	 */
	protected void syncPageBook(PageBook pageBook) {
		int pos = tabFolder.getSelectionIndex();
		Control children[] = pageBook.getChildren();
		int size = children.length;
		if (pos < size) {
			pageBook.showPage(children[pos]);
		}
	}
}
