update/org.eclipse.update.ui.forms/Eclipse Forms/org/eclipse/ui/forms/internal/widgets/WrappedPageBook.java

/*
 * Created on Feb 13, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package org.eclipse.ui.forms.internal.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.forms.widgets.ILayoutExtension;
;
/**
 * @author dejan
 * 
 * To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Generation - Code and Comments
 */
/**
 * A pagebook is a composite control where only a single control is visible at
 * a time. It is similar to a notebook, but without tabs.
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 * 
 * @see PageBookView
 */
public class WrappedPageBook extends Composite {
	class PageBookLayout extends Layout implements ILayoutExtension {
		protected Point computeSize(Composite composite, int wHint, int hHint,
				boolean flushCache) {
			if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT)
				return new Point(wHint, hHint);
			Point result = null;
			if (currentPage != null) {
				result = currentPage.computeSize(wHint, hHint, flushCache);
			} else {
				result = new Point(0, 0);
			}
			return result;
		}
		protected void layout(Composite composite, boolean flushCache) {
			if (currentPage != null) {
				currentPage.setBounds(composite.getClientArea());
			}
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.forms.widgets.ILayoutExtension#computeMaximumWidth(org.eclipse.swt.widgets.Composite,
		 *      boolean)
		 */
		public int computeMaximumWidth(Composite parent, boolean changed) {
			return computeSize(parent, SWT.DEFAULT, SWT.DEFAULT, changed).x;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.forms.widgets.ILayoutExtension#computeMinimumWidth(org.eclipse.swt.widgets.Composite,
		 *      boolean)
		 */
		public int computeMinimumWidth(Composite parent, boolean changed) {
			return computeSize(parent, 0, SWT.DEFAULT, changed).x;
		}
	}
	/**
	 * The current control; <code>null</code> if none.
	 */
	private Control currentPage = null;
	/**
	 * Creates a new empty pagebook.
	 * 
	 * @param parent
	 *            the parent composite
	 * @param style
	 *            the SWT style bits
	 */
	public WrappedPageBook(Composite parent, int style) {
		super(parent, style);
		setLayout(new PageBookLayout());
	}
	/**
	 * Shows the given page. This method has no effect if the given page is not
	 * contained in this pagebook.
	 * 
	 * @param page
	 *            the page to show
	 */
	public void showPage(Control page) {
		if (page == currentPage)
			return;
		if (page.getParent() != this)
			return;
		Control oldPage = currentPage;
		currentPage = page;
		// show new page
		if (page != null) {
			if (!page.isDisposed()) {
				//page.setVisible(true);
				layout(true);
				page.setVisible(true);
			}
		}
		// hide old *after* new page has been made visible in order to avoid
		// flashing
		if (oldPage != null && !oldPage.isDisposed())
			oldPage.setVisible(false);
	}
	public Point computeSize(int wHint, int hHint, boolean changed) {
		return ((PageBookLayout) getLayout()).computeSize(this, wHint, hHint,
				changed);
	}
}