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/*******************************************************************************
* Copyright (c) 2008 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.ui.internal.util;
import org.eclipse.jpt.ui.internal.listeners.SWTPropertyChangeListenerWrapper;
import org.eclipse.jpt.utility.internal.Transformer;
import org.eclipse.jpt.utility.model.event.PropertyChangeEvent;
import org.eclipse.jpt.utility.model.listener.PropertyChangeListener;
import org.eclipse.jpt.utility.model.value.PropertyValueModel;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.part.PageBook;
/**
* This controller is responsible to switch the active page based on a value. A
* <code>Transformer</code> is used to transformed that value into a
* <code>Control</code>.
*
* @version 2.0
* @since 2.0
*/
public final class ControlSwitcher
{
/**
* The widget that is used to show the active <code>Control</code>.
*/
private PageBook pageBook;
/**
* The <code>Transformer</code> used to transform the value into a
* <code>Control</code>.
*/
private Transformer<?, Control> paneTransformer;
/**
* Creates a new <code>ControlSwitcher</code>.
*
* @param switchHolder The holder of the value that will be used to retrieve
* the right <code>Control</code> when passed to the given transformer
* @param paneTransformer The <code>Transformer</code> used to transform the value into a
* <code>Control</code>
* @param pageBook The <code>Transformer</code> used to transform the value
* into a <code>Control</code>
*/
public <T> ControlSwitcher(PropertyValueModel<? extends T> switchHolder,
Transformer<T, Control> paneTransformer,
PageBook pageBook)
{
super();
initialize(switchHolder, paneTransformer, pageBook);
}
private PropertyChangeListener buildPropertyChangeListener() {
return new SWTPropertyChangeListenerWrapper(
buildPropertyChangeListener_()
);
}
private PropertyChangeListener buildPropertyChangeListener_() {
return new PropertyChangeListener() {
public void propertyChanged(PropertyChangeEvent e) {
switchPanes(e.newValue());
}
};
}
/**
* Initializes this <code>ControlSwitcher</code>.
*
* @param switchHolder The holder of the value that will be used to retrieve
* the right <code>Control</code> when passed to the given transformer
* @param paneTransformer The <code>Transformer</code> used to transform the value into a
* <code>Control</code>
* @param pageBook The <code>Transformer</code> used to transform the value
* into a <code>Control</code>
*/
private void initialize(PropertyValueModel<?> switchHolder,
Transformer<?, Control> paneTransformer,
PageBook pageBook)
{
this.pageBook = pageBook;
this.paneTransformer = paneTransformer;
switchHolder.addPropertyChangeListener(
PropertyValueModel.VALUE,
buildPropertyChangeListener()
);
switchPanes(switchHolder.value());
}
/**
* Switches the active page by transforming the given value into its
* corresponding pane.
*
* @param value The state passed to the transformer in order to retrieve the
* new pane
*/
private void switchPanes(Object value) {
if (pageBook.isDisposed()) {
return;
}
// Retrieve the Control for the new value
Control pane = transform(value);
boolean visible = (pane != null);
// Show the new page
if (visible) {
pageBook.showPage(pane);
}
else {
// Note: We can't null due to a bug in PageBook
pageBook.showPage(new Label(pageBook, SWT.SEPARATOR | SWT.HORIZONTAL));
}
if (pageBook.isVisible() != visible) {
pageBook.setVisible(visible);
}
// Revalidate the parents in order to update the layout
SWTUtil.reflow(pageBook);
}
@SuppressWarnings("unchecked")
private Control transform(Object value) {
return ((Transformer<Object, Control>) paneTransformer).transform(value);
}
}
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