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org/w3c/dom/events/EventTarget.java

/*
 * 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>EventTarget</code> interface is implemented by all 
 * <code>Nodes</code> in an implementation which supports the DOM Event 
 * Model. Therefore, this interface can be obtained by using 
 * binding-specific casting methods on an instance of the <code>Node</code> 
 * interface. The interface allows registration and removal of 
 * <code>EventListeners</code> on an <code>EventTarget</code> and dispatch 
 * of events to that <code>EventTarget</code>.
 * <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 EventTarget {
    /**
     * This method allows the registration of event listeners on the event 
     * target. If an <code>EventListener</code> is added to an 
     * <code>EventTarget</code> while it is processing an event, it will not 
     * be triggered by the current actions but may be triggered during a 
     * later stage of event flow, such as the bubbling phase. 
     * <br> If multiple identical <code>EventListener</code>s are registered 
     * on the same <code>EventTarget</code> with the same parameters the 
     * duplicate instances are discarded. They do not cause the 
     * <code>EventListener</code> to be called twice and since they are 
     * discarded they do not need to be removed with the 
     * <code>removeEventListener</code> method. 
     * @param type The event type for which the user is registering
     * @param listener The <code>listener</code> parameter takes an interface 
     *   implemented by the user which contains the methods to be called 
     *   when the event occurs.
     * @param useCapture If true, <code>useCapture</code> indicates that the 
     *   user wishes to initiate capture. After initiating capture, all 
     *   events of the specified type will be dispatched to the registered 
     *   <code>EventListener</code> before being dispatched to any 
     *   <code>EventTargets</code> beneath them in the tree. Events which 
     *   are bubbling upward through the tree will not trigger an 
     *   <code>EventListener</code> designated to use capture.
     */
    public void addEventListener(String type, 
                                 EventListener listener, 
                                 boolean useCapture);

    /**
     * This method allows the removal of event listeners from the event 
     * target. If an <code>EventListener</code> is removed from an 
     * <code>EventTarget</code> while it is processing an event, it will not 
     * be triggered by the current actions. <code>EventListener</code>s can 
     * never be invoked after being removed.
     * <br>Calling <code>removeEventListener</code> with arguments which do 
     * not identify any currently registered <code>EventListener</code> on 
     * the <code>EventTarget</code> has no effect.
     * @param type Specifies the event type of the <code>EventListener</code> 
     *   being removed. 
     * @param listener The <code>EventListener</code> parameter indicates the 
     *   <code>EventListener </code> to be removed. 
     * @param useCapture Specifies whether the <code>EventListener</code> 
     *   being removed was registered as a capturing listener or not. If a 
     *   listener was registered twice, one with capture and one without, 
     *   each must be removed separately. Removal of a capturing listener 
     *   does not affect a non-capturing version of the same listener, and 
     *   vice versa. 
     */
    public void removeEventListener(String type, 
                                    EventListener listener, 
                                    boolean useCapture);

    /**
     * This method allows the dispatch of events into the implementations 
     * event model. Events dispatched in this manner will have the same 
     * capturing and bubbling behavior as events dispatched directly by the 
     * implementation. The target of the event is the 
     * <code> EventTarget</code> on which <code>dispatchEvent</code> is 
     * called. 
     * @param evt Specifies the event type, behavior, and contextual 
     *   information to be used in processing the event.
     * @return The return value of <code>dispatchEvent</code> indicates 
     *   whether any of the listeners which handled the event called 
     *   <code>preventDefault</code>. If <code>preventDefault</code> was 
     *   called the value is false, else the value is true. 
     * @exception EventException
     *   UNSPECIFIED_EVENT_TYPE_ERR: Raised if the <code>Event</code>'s type 
     *   was not specified by initializing the event before 
     *   <code>dispatchEvent</code> was called. Specification of the 
     *   <code>Event</code>'s type as <code>null</code> or an empty string 
     *   will also trigger this exception.
     */
    public boolean dispatchEvent(Event evt)
                                 throws EventException;

}

org/w3c/dom/events/EventTarget.java

 

 

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