package org.eclipse.update.ui.forms;
/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */

import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.graphics.*;
import java.util.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.*;
import org.eclipse.ui.part.*;
import org.eclipse.jface.resource.*;
import org.eclipse.swt.custom.*;


public class NoTabsWorkbook implements IFormWorkbook {
	private Vector pages;
	private boolean firstPageSelected=true;
	private PageBook pageBook;
	private Vector listeners=new Vector();
	private IFormPage currentPage;

public NoTabsWorkbook() {
	pages = new Vector();
}
public void addFormSelectionListener(IFormSelectionListener listener) {
	listeners.addElement(listener);
}
public void addPage(IFormPage page) {
	pages.add(page);
	
	if (firstPageSelected && currentPage == null)
		selectPage(page);
}

public void createControl(Composite parent) {
	pageBook = new PageBook(parent, SWT.NULL);
}

private void fireSelectionChanged(IFormPage page) {
	for (Iterator iter = listeners.iterator(); iter.hasNext();) {
		IFormSelectionListener listener = (IFormSelectionListener) iter.next();
		listener.formSelected(page);
	}
}

public Control getControl() {
	return pageBook;
}

public IFormPage getCurrentPage() {
	return currentPage;
}

public boolean isFirstPageSelected() {
	return firstPageSelected;
}
public void removeFormSelectionListener(IFormSelectionListener listener) {
	listeners.removeElement(listener);
}

public void removePage(IFormPage page) {
	if (pages.contains(page)) {
		page.getControl().dispose();
		pages.remove(page);
	}
}

public void selectPage(final IFormPage page) {
	final IFormPage oldPage = currentPage;
	currentPage = page;

	// It may take a while
	BusyIndicator.showWhile(pageBook.getDisplay(), new Runnable() {
		public void run() {
			switchPages(oldPage, page);
		}
	});
}

public void setFirstPageSelected(boolean newFirstPageSelected) {
	firstPageSelected = newFirstPageSelected;
}

private void switchPages(IFormPage oldPage, IFormPage newPage) {
	if (oldPage != null && oldPage!=newPage) {
		oldPage.becomesInvisible(newPage);
	}
	if (newPage.getControl() == null)
		newPage.createControl(pageBook);
	pageBook.showPage(newPage.getControl());

	newPage.becomesVisible(oldPage);
	fireSelectionChanged(newPage);
}
}