content: /*
   * 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 mf.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.
       */
      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.
       */
      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.
       * @throws 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.
       */
      boolean dispatchEvent(Event evt)
              throws EventException;
  
  }
  