/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Tom Pixley <joki@netscape.com> (original author)
* Johnny Stenback <jst@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "domstubs.idl"
/**
* The nsIDOMEventTarget interface is the interface implemented by all
* event targets in the Document Object Model.
*
* For more information on this interface please see
* http://www.w3.org/TR/DOM-Level-2-Events/
*
* @status FROZEN
*/
[scriptable, uuid(1c773b30-d1cf-11d2-bd95-00805f8ae3f4)]
interface nsIDOMEventTarget : nsISupports
{
/**
* This method allows the registration of event listeners on the event target.
* If an EventListener is added to an EventTarget 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.
*
* If multiple identical EventListeners are registered on the same
* EventTarget with the same parameters the duplicate instances are
* discarded. They do not cause the EventListener to be called twice
* and since they are discarded they do not need to be removed with the
* removeEventListener method.
*
* @param type The event type for which the user is registering
* @param listener The listener parameter takes an interface
* implemented by the user which contains the methods
* to be called when the event occurs.
* @param useCapture If true, useCapture indicates that the user
* wishes to initiate capture. After initiating
* capture, all events of the specified type will be
* dispatched to the registered EventListener before
* being dispatched to any EventTargets beneath them
* in the tree. Events which are bubbling upward
* through the tree will not trigger an
* EventListener designated to use capture.
*/
void addEventListener(in DOMString type,
in nsIDOMEventListener listener,
in boolean useCapture);
/**
* This method allows the removal of event listeners from the event
* target. If an EventListener is removed from an EventTarget while it
* is processing an event, it will not be triggered by the current actions.
* EventListeners can never be invoked after being removed.
* Calling removeEventListener with arguments which do not identify any
* currently registered EventListener on the EventTarget has no effect.
*
* @param type Specifies the event type of the EventListener being
* removed.
* @param listener The EventListener parameter indicates the
* EventListener to be removed.
* @param useCapture Specifies whether the EventListener 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(in DOMString type,
in nsIDOMEventListener listener,
in 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 EventTarget on which
* dispatchEvent is called.
*
* @param evt Specifies the event type, behavior, and contextual
* information to be used in processing the event.
* @return Indicates whether any of the listeners which handled the
* event called preventDefault. If preventDefault was called
* the value is false, else the value is true.
* @throws UNSPECIFIED_EVENT_TYPE_ERR: Raised if the Event's type was
* not specified by initializing the event before
* dispatchEvent was called. Specification of the Event's
* type as null or an empty string will also trigger this
* exception.
*/
boolean dispatchEvent(in nsIDOMEvent evt)
raises(DOMException);
};