/*
 * @(#)DocumentListener.java	1.14 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package javax.swing.event;

import java.util.EventListener;

/**
 * Interface for an observer to register to receive notifications 
 * of changes to a text document.  
 * <p>
 * The default implementation of
 * the Document interface (AbstractDocument) supports asynchronous
 * mutations.  If this feature is used (i.e. mutations are made
 * from a thread other than the Swing event thread), the listeners
 * will be notified via the mutating thread.  <em>This means that
 * if asynchronous updates are made, the implementation of this
 * interface must be threadsafe</em>!
 * <p>
 * The DocumentEvent notification is based upon the JavaBeans
 * event model.  There is no guarantee about the order of delivery
 * to listeners, and all listeners must be notified prior to making 
 * further mutations to the Document.  <em>This means implementations 
 * of the DocumentListener may not mutate the source of the event 
 * (i.e. the associated Document)</em>.
 *
 * @author  Timothy Prinzing
 * @version 1.14 12/19/03
 * @see javax.swing.text.Document
 * @see javax.swing.text.StyledDocument
 * @see DocumentEvent
 */
public interface DocumentListener extends EventListener {

    /**
     * Gives notification that there was an insert into the document.  The 
     * range given by the DocumentEvent bounds the freshly inserted region.
     *
     * @param e the document event
     */
    public void insertUpdate(DocumentEvent e);

    /**
     * Gives notification that a portion of the document has been 
     * removed.  The range is given in terms of what the view last
     * saw (that is, before updating sticky positions).
     *
     * @param e the document event
     */
    public void removeUpdate(DocumentEvent e);

    /**
     * Gives notification that an attribute or set of attributes changed.
     *
     * @param e the document event
     */
    public void changedUpdate(DocumentEvent e);
}