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Side by Side Diff: ui/webui/resources/js/cr/event_target.js

Issue 2597013002: Run clang-format on ui/webui/resources (Closed)
Patch Set: remove cr_shared_menu.js Created 3 years, 12 months ago
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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 /** 5 /**
6 * @fileoverview This contains an implementation of the EventTarget interface 6 * @fileoverview This contains an implementation of the EventTarget interface
7 * as defined by DOM Level 2 Events. 7 * as defined by DOM Level 2 Events.
8 */ 8 */
9 9
10 /** 10 /**
11 * @typedef {EventListener|function(!Event):*} 11 * @typedef {EventListener|function(!Event):*}
12 */ 12 */
13 var EventListenerType; 13 var EventListenerType;
14 14
15 cr.define('cr', function() { 15 cr.define('cr', function() {
16 16
17 /** 17 /**
18 * Creates a new EventTarget. This class implements the DOM level 2 18 * Creates a new EventTarget. This class implements the DOM level 2
19 * EventTarget interface and can be used wherever those are used. 19 * EventTarget interface and can be used wherever those are used.
20 * @constructor 20 * @constructor
21 * @implements {EventTarget} 21 * @implements {EventTarget}
22 */ 22 */
23 function EventTarget() { 23 function EventTarget() {}
24 }
25 24
26 EventTarget.prototype = { 25 EventTarget.prototype = {
27 /** 26 /**
28 * Adds an event listener to the target. 27 * Adds an event listener to the target.
29 * @param {string} type The name of the event. 28 * @param {string} type The name of the event.
30 * @param {EventListenerType} handler The handler for the event. This is 29 * @param {EventListenerType} handler The handler for the event. This is
31 * called when the event is dispatched. 30 * called when the event is dispatched.
32 */ 31 */
33 addEventListener: function(type, handler) { 32 addEventListener: function(type, handler) {
34 if (!this.listeners_) 33 if (!this.listeners_)
(...skipping 35 matching lines...) Expand 10 before | Expand all | Expand 10 after
70 * @return {boolean} Whether the default action was prevented. If someone 69 * @return {boolean} Whether the default action was prevented. If someone
71 * calls preventDefault on the event object then this returns false. 70 * calls preventDefault on the event object then this returns false.
72 */ 71 */
73 dispatchEvent: function(event) { 72 dispatchEvent: function(event) {
74 if (!this.listeners_) 73 if (!this.listeners_)
75 return true; 74 return true;
76 75
77 // Since we are using DOM Event objects we need to override some of the 76 // Since we are using DOM Event objects we need to override some of the
78 // properties and methods so that we can emulate this correctly. 77 // properties and methods so that we can emulate this correctly.
79 var self = this; 78 var self = this;
80 event.__defineGetter__('target', function() { 79 event.__defineGetter__('target', function() { return self; });
81 return self;
82 });
83 80
84 var type = event.type; 81 var type = event.type;
85 var prevented = 0; 82 var prevented = 0;
86 if (type in this.listeners_) { 83 if (type in this.listeners_) {
87 // Clone to prevent removal during dispatch 84 // Clone to prevent removal during dispatch
88 var handlers = this.listeners_[type].concat(); 85 var handlers = this.listeners_[type].concat();
89 for (var i = 0, handler; handler = handlers[i]; i++) { 86 for (var i = 0, handler; handler = handlers[i]; i++) {
90 if (handler.handleEvent) 87 if (handler.handleEvent)
91 prevented |= handler.handleEvent.call(handler, event) === false; 88 prevented |= handler.handleEvent.call(handler, event) === false;
92 else 89 else
93 prevented |= handler.call(this, event) === false; 90 prevented |= handler.call(this, event) === false;
94 } 91 }
95 } 92 }
96 93
97 return !prevented && !event.defaultPrevented; 94 return !prevented && !event.defaultPrevented;
98 } 95 }
99 }; 96 };
100 97
101 // Export 98 // Export
102 return { 99 return {EventTarget: EventTarget};
103 EventTarget: EventTarget
104 };
105 }); 100 });
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