SwappableComposite.java

/*
 * Copyright 2008-2012 Amazon Technologies, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at:
 * 
 *    http://aws.amazon.com/apache2.0
 *
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES 
 * OR CONDITIONS OF ANY KIND, either express or implied. See the 
 * License for the specific language governing permissions and 
 * limitations under the License. 
 */

package com.amazonaws.eclipse.ec2.ui;

import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

/**
 * A SwappableComposite allows only one of its children to be displayed at
 * once.  When one child is displayed, all the others are hidden.
 */
public class SwappableComposite extends Composite {
	/**
	 * Creates a new SwappableComposite with the specified parent and SWT
	 * style.
	 * 
	 * @param parent
	 *            The parent of this composite.
	 * @param style
	 *            The SWT style for this composite.
	 */
	public SwappableComposite(Composite parent, int style) {
		super (parent, style);
	}

	/**
	 * Displays the specified composite and hides all other child
	 * composites.
	 * 
	 * @param composite
	 *            The child Composite to display.
	 */
	public void setActiveComposite(Control composite) {
		if (composite == null) return;
		
		for (Control control : getChildren()) {
			if (composite.equals(control)) {
				control.setVisible(true);
				control.setBounds(getClientArea());
				control.getParent().layout();
			} else {
				control.setVisible(false);
			}
		}
	}
}