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// Copyright 2010 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Event observer.
*
* Provides an event observer that holds onto events that it handles. This
* can be used in unit testing to verify an event target's events --
* that the order count, types, etc. are correct.
*
* Example usage:
* <pre>
* var observer = new goog.testing.events.EventObserver();
* var widget = new foo.Widget();
* goog.events.listen(widget, ['select', 'submit'], observer);
* // Simulate user action of 3 select events and 2 submit events.
* assertEquals(3, observer.getEvents('select').length);
* assertEquals(2, observer.getEvents('submit').length);
* </pre>
*
* @author nnaze@google.com (Nathan Naze)
*/
goog.provide('goog.testing.events.EventObserver');
goog.require('goog.array');
/**
* Event observer. Implements a handleEvent interface so it may be used as
* a listener in listening functions and methods.
* @see goog.events.listen
* @see goog.events.EventHandler
* @constructor
*/
goog.testing.events.EventObserver = function() {
/**
* A list of events handled by the observer in order of handling, oldest to
* newest.
* @type {!Array.<!goog.events.Event>}
* @private
*/
this.events_ = [];
};
/**
* Handles an event and remembers it. Event listening functions and methods
* will call this method when this observer is used as a listener.
* @see goog.events.listen
* @see goog.events.EventHandler
* @param {!goog.events.Event} e Event to handle.
*/
goog.testing.events.EventObserver.prototype.handleEvent = function(e) {
this.events_.push(e);
};
/**
* @param {string=} opt_type If given, only return events of this type.
* @return {!Array.<!goog.events.Event>} The events handled, oldest to newest.
*/
goog.testing.events.EventObserver.prototype.getEvents = function(opt_type) {
var events = goog.array.clone(this.events_);
if (opt_type) {
events = goog.array.filter(events, function(event) {
return event.type == opt_type;
});
}
return events;
};
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