/*******************************************************************************
* Copyright (c) 2004, 2007 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.internal.forms.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.forms.widgets.ILayoutExtension;
/**
* 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>
*/
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);
}
}
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