eventlistener.java

来自「java1.6众多例子参考」· Java 代码 · 共 42 行

/*
 * Copyright (c) 2000 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. This program is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.
 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom.events;

/**
 *  The <code>EventListener</code> interface is the primary method for 
 * handling events. Users implement the <code>EventListener</code> interface 
 * and register their listener on an <code>EventTarget</code> using the 
 * <code>AddEventListener</code> method. The users should also remove their 
 * <code>EventListener</code> from its <code>EventTarget</code> after they 
 * have completed using the listener. 
 * <p> When a <code>Node</code> is copied using the <code>cloneNode</code> 
 * method the <code>EventListener</code>s attached to the source 
 * <code>Node</code> are not attached to the copied <code>Node</code>. If 
 * the user wishes the same <code>EventListener</code>s to be added to the 
 * newly created copy the user must add them manually. 
 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113'>Document Object Model (DOM) Level 2 Events Specification</a>.
 * @since DOM Level 2
 */
public interface EventListener {
    /**
     *  This method is called whenever an event occurs of the type for which 
     * the <code> EventListener</code> interface was registered. 
     * @param evt  The <code>Event</code> contains contextual information 
     *   about the event. It also contains the <code>stopPropagation</code> 
     *   and <code>preventDefault</code> methods which are used in 
     *   determining the event's flow and default action. 
     */
    public void handleEvent(Event evt);

}