/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.text;


/**
 * Registered with a text viewer, viewport listeners are
 * informed about changes of a text viewer's viewport. The view port is that 
 * portion of the viewer's document which is visible in the viewer. <p>
 * Clients may implement this interface.
 *
 * @see org.eclipse.jface.text.ITextViewer 
 */
public interface IViewportListener {
	
	/**
	 * Informs about viewport changes. The given vertical position
	 * is the new vertical scrolling offset measured in pixels.
	 * 
	 * @param verticalOffset the vertical offset
	 */
	void viewportChanged(int verticalOffset);
}