/**
* @license
* Copyright The Closure Library Authors.
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview A base class for event objects.
*/
goog.provide('goog.events.Event');
/**
* goog.events.Event no longer depends on goog.Disposable. Keep requiring
* goog.Disposable here to not break projects which assume this dependency.
* @suppress {extraRequire}
*/
goog.require('goog.Disposable');
goog.require('goog.events.EventId');
/**
* A base class for event objects, so that they can support preventDefault and
* stopPropagation.
*
* @param {string|!goog.events.EventId} type Event Type.
* @param {Object=} opt_target Reference to the object that is the target of
* this event. It has to implement the `EventTarget` interface
* declared at {@link http://developer.mozilla.org/en/DOM/EventTarget}.
* @constructor
*/
goog.events.Event = function(type, opt_target) {
'use strict';
/**
* Event type.
* @type {string}
*/
this.type = type instanceof goog.events.EventId ? String(type) : type;
/**
* TODO(tbreisacher): The type should probably be
* EventTarget|goog.events.EventTarget.
*
* Target of the event.
* @type {Object|undefined}
*/
this.target = opt_target;
/**
* Object that had the listener attached.
* @type {Object|undefined}
*/
this.currentTarget = this.target;
/**
* Whether to cancel the event in internal capture/bubble processing for IE.
* @type {boolean}
* @private
*/
this.propagationStopped_ = false;
/**
* Whether the default action has been prevented.
* This is a property to match the W3C specification at
* {@link http://www.w3.org/TR/DOM-Level-3-Events/
* #events-event-type-defaultPrevented}.
* Must be treated as read-only outside the class.
* @type {boolean}
*/
this.defaultPrevented = false;
};
/**
* @return {boolean} true iff internal propagation has been stopped.
*/
goog.events.Event.prototype.hasPropagationStopped = function() {
'use strict';
return this.propagationStopped_;
};
/**
* Stops event propagation.
* @return {void}
*/
goog.events.Event.prototype.stopPropagation = function() {
'use strict';
this.propagationStopped_ = true;
};
/**
* Prevents the default action, for example a link redirecting to a url.
* @return {void}
*/
goog.events.Event.prototype.preventDefault = function() {
'use strict';
this.defaultPrevented = true;
};
/**
* Stops the propagation of the event. It is equivalent to
* `e.stopPropagation()`, but can be used as the callback argument of
* {@link goog.events.listen} without declaring another function.
* @param {!goog.events.Event} e An event.
* @return {void}
*/
goog.events.Event.stopPropagation = function(e) {
'use strict';
e.stopPropagation();
};
/**
* Prevents the default action. It is equivalent to
* `e.preventDefault()`, but can be used as the callback argument of
* {@link goog.events.listen} without declaring another function.
* @param {!goog.events.Event} e An event.
* @return {void}
*/
goog.events.Event.preventDefault = function(e) {
'use strict';
e.preventDefault();
};