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/*
 * 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 Event interface is used to provide contextual information 
 * about an event to the handler processing the event. An object which 
 * implements the Event interface is generally passed as the 
 * first parameter to an event handler. More specific context information is 
 * passed to event handlers by deriving additional interfaces from 
 * Event which contain information directly relating to the 
 * type of event they accompany. These derived interfaces are also 
 * implemented by the object passed to the event listener. 
 * 

See also the Document Object Model (DOM) Level 2 Events Specification. * @since DOM Level 2 */ public interface Event { // PhaseType /** * The current event phase is the capturing phase. */ public static final short CAPTURING_PHASE = 1; /** * The event is currently being evaluated at the target * EventTarget. */ public static final short AT_TARGET = 2; /** * The current event phase is the bubbling phase. */ public static final short BUBBLING_PHASE = 3; /** * The name of the event (case-insensitive). The name must be an XML name. */ public String getType(); /** * Used to indicate the EventTarget to which the event was * originally dispatched. */ public EventTarget getTarget(); /** * Used to indicate the EventTarget whose * EventListeners are currently being processed. This is * particularly useful during capturing and bubbling. */ public EventTarget getCurrentTarget(); /** * Used to indicate which phase of event flow is currently being * evaluated. */ public short getEventPhase(); /** * Used to indicate whether or not an event is a bubbling event. If the * event can bubble the value is true, else the value is false. */ public boolean getBubbles(); /** * Used to indicate whether or not an event can have its default action * prevented. If the default action can be prevented the value is true, * else the value is false. */ public boolean getCancelable(); /** * Used to specify the time (in milliseconds relative to the epoch) at * which the event was created. Due to the fact that some systems may * not provide this information the value of timeStamp may * be not available for all events. When not available, a value of 0 * will be returned. Examples of epoch time are the time of the system * start or 0:0:0 UTC 1st January 1970. */ public long getTimeStamp(); /** * The stopPropagation method is used prevent further * propagation of an event during event flow. If this method is called * by any EventListener the event will cease propagating * through the tree. The event will complete dispatch to all listeners * on the current EventTarget before event flow stops. This * method may be used during any stage of event flow. */ public void stopPropagation(); /** * If an event is cancelable, the preventDefault method is * used to signify that the event is to be canceled, meaning any default * action normally taken by the implementation as a result of the event * will not occur. If, during any stage of event flow, the * preventDefault method is called the event is canceled. * Any default action associated with the event will not occur. Calling * this method for a non-cancelable event has no effect. Once * preventDefault has been called it will remain in effect * throughout the remainder of the event's propagation. This method may * be used during any stage of event flow. */ public void preventDefault(); /** * The initEvent method is used to initialize the value of an * Event created through the DocumentEvent * interface. This method may only be called before the * Event has been dispatched via the * dispatchEvent method, though it may be called multiple * times during that phase if necessary. If called multiple times the * final invocation takes precedence. If called from a subclass of * Event interface only the values specified in the * initEvent method are modified, all other attributes are * left unchanged. * @param eventTypeArg Specifies the event type. This type may be any * event type currently defined in this specification or a new event * type.. The string must be an XML name. Any new event type must not * begin with any upper, lower, or mixed case version of the string * "DOM". This prefix is reserved for future DOM event sets. It is * also strongly recommended that third parties adding their own * events use their own prefix to avoid confusion and lessen the * probability of conflicts with other new events. * @param canBubbleArg Specifies whether or not the event can bubble. * @param cancelableArg Specifies whether or not the event's default * action can be prevented. */ public void initEvent(String eventTypeArg, boolean canBubbleArg, boolean cancelableArg); }





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