/*
* Copyright (c) 2007 World Wide Web Consortium,
*
* (Massachusetts Institute of Technology, European Research Consortium for
* Informatics and Mathematics, Keio University). All Rights Reserved. This
* work is distributed under the W3C(r) Software License [1] 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.
*
* [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
*
* Difference to the original copy of this file:
* 1) REMOVE DOMException thrown by dispatchEvent(Event evt);
* 2) REMOVE public void addEventListenerNS(String namespaceURI,
* String type,
* EventListener listener,
* boolean useCapture);
* 3) REMOVE public void removeEventListenerNS(String namespaceURI,
* String type,
* EventListener listener,
* boolean useCapture);
*/
package org.w3c.dom.events;
/**
* The <code>EventTarget</code> interface is implemented by all the objects
* which could be event targets in an implementation which supports an event
* flow. The interface allows registration and removal of event listeners,
* and dispatch of events to an event target.
* <p> When used with the DOM event flow, this interface is implemented by all
* target nodes and target ancestors, i.e. all DOM <code>Nodes</code> of the
* tree support this interface when the implementation conforms to DOM Level
* 3 Events and, therefore, this interface can be obtained by using
* binding-specific casting methods on an instance of the <code>Node</code>
* interface.
* <p> Invoking <code>addEventListener</code> or
* <code>addEventListenerNS</code> repeatedly on the same
* <code>EventTarget</code> with the same values for the parameters
* <code>namespaceURI</code>, <code>type</code>, <code>listener</code>, and
* <code>useCapture</code> has no effect. Doing so does not cause the
* <code>EventListener</code> to be called more than once and does not cause
* a change in the triggering order.
* <p>See also the <a href='http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071207'>
Document Object Model (DOM) Level 3 Events Specification
</a>.
* @since DOM Level 2
*/
public interface EventTarget {
/**
* Registers an event listener, depending on the <code>useCapture</code>
* parameter, on the capture phase of the DOM event flow or its target
* and bubbling phases. Invoking this method is equivalent to invoking
* <code>addEventListenerNS</code> with the same values for the
* parameters <code>type</code>, <code>listener</code>, and
* <code>useCapture</code>, and the value <code>null</code> for the
* parameter <code>namespaceURI</code>.
* @param type Specifies the <code>Event.type</code> associated with the
* event for which the user is registering.
* @param listener The <code>listener</code> parameter takes an object
* implemented by the user which implements the
* <code>EventListener</code> interface and contains the method to be
* called when the event occurs.
* @param useCapture If true, <code>useCapture</code> indicates that the
* user wishes to add the event listener for the capture phase only,
* i.e. this event listener will not be triggered during the target
* and bubbling phases. If <code>false</code>, the event listener will
* only be triggered during the target and bubbling phases.
*/
public void addEventListener(String type,
EventListener listener,
boolean useCapture);
/**
* Removes an event listener. Calling <code>removeEventListener</code>
* with arguments which do not identify any currently registered
* <code>EventListener</code> on the <code>EventTarget</code> has no
* effect. The <code>Event.namespaceURI</code> for which the user
* registered the event listener is implied and is <code>null</code>.
* @param type Specifies the <code>Event.type</code> for which the user
* registered the event listener.
* @param listener The <code>EventListener</code> to be removed.
* @param useCapture Specifies whether the <code>EventListener</code>
* being removed was registered for the capture phase or not. If a
* listener was registered twice, once for the capture phase and once
* for the target and bubbling phases, each must be removed
* separately. Removal of an event listener registered for the capture
* phase does not affect the same event listener registered for the
* target and bubbling phases, and vice versa.
*/
public void removeEventListener(String type,
EventListener listener,
boolean useCapture);
/**
* Dispatches an event into the implementation's event model. The event
* target of the event is the <code>EventTarget</code> object on which
* <code>dispatchEvent</code> is called.
* @param evt The event to be dispatched.
* @return Indicates whether any of the listeners which handled the
* event called <code>Event.preventDefault()</code>. If
* <code>Event.preventDefault()</code> was called the returned value
* is <code>false</code>, else it is <code>true</code>.
* @exception EventException
* UNSPECIFIED_EVENT_TYPE_ERR: Raised if the <code>Event.type</code>
* was not specified by initializing the event before
* <code>dispatchEvent</code> was called. Specification of the
* <code>Event.type</code> as <code>null</code> or an empty string
* will also trigger this exception.
* <br> DISPATCH_REQUEST_ERR: Raised if the <code>Event</code> object is
* already being dispatched.
* @exception DOMException
* NOT_SUPPORTED_ERR: Raised if the <code>Event</code> object has not
* been created using <code>DocumentEvent.createEvent()</code>.
* <br> INVALID_CHARACTER_ERR: Raised if <code>Event.type</code> is not
* an <a href='http://www.w3.org/TR/2004/REC-xml-names11-20040204/#NT-NCName'>NCName</a> as defined in [<a href='http://www.w3.org/TR/2006/REC-xml-names11-20060816'>XML Namespaces 1.1</a>]
* .
* @version DOM Level 3
*/
public boolean dispatchEvent(Event evt)
throws EventException;
}