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

Issue 2603443002: Clang format JS: Disallow single line functions, conditionals, loops, and switch statements (Closed)
Patch Set: more options 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 }
24 25
25 EventTarget.prototype = { 26 EventTarget.prototype = {
26 /** 27 /**
27 * Adds an event listener to the target. 28 * Adds an event listener to the target.
28 * @param {string} type The name of the event. 29 * @param {string} type The name of the event.
29 * @param {EventListenerType} handler The handler for the event. This is 30 * @param {EventListenerType} handler The handler for the event. This is
30 * called when the event is dispatched. 31 * called when the event is dispatched.
31 */ 32 */
32 addEventListener: function(type, handler) { 33 addEventListener: function(type, handler) {
33 if (!this.listeners_) 34 if (!this.listeners_)
(...skipping 35 matching lines...) Expand 10 before | Expand all | Expand 10 after
69 * @return {boolean} Whether the default action was prevented. If someone 70 * @return {boolean} Whether the default action was prevented. If someone
70 * calls preventDefault on the event object then this returns false. 71 * calls preventDefault on the event object then this returns false.
71 */ 72 */
72 dispatchEvent: function(event) { 73 dispatchEvent: function(event) {
73 if (!this.listeners_) 74 if (!this.listeners_)
74 return true; 75 return true;
75 76
76 // Since we are using DOM Event objects we need to override some of the 77 // Since we are using DOM Event objects we need to override some of the
77 // properties and methods so that we can emulate this correctly. 78 // properties and methods so that we can emulate this correctly.
78 var self = this; 79 var self = this;
79 event.__defineGetter__('target', function() { return self; }); 80 event.__defineGetter__('target', function() {
81 return self;
82 });
80 83
81 var type = event.type; 84 var type = event.type;
82 var prevented = 0; 85 var prevented = 0;
83 if (type in this.listeners_) { 86 if (type in this.listeners_) {
84 // Clone to prevent removal during dispatch 87 // Clone to prevent removal during dispatch
85 var handlers = this.listeners_[type].concat(); 88 var handlers = this.listeners_[type].concat();
86 for (var i = 0, handler; handler = handlers[i]; i++) { 89 for (var i = 0, handler; handler = handlers[i]; i++) {
87 if (handler.handleEvent) 90 if (handler.handleEvent)
88 prevented |= handler.handleEvent.call(handler, event) === false; 91 prevented |= handler.handleEvent.call(handler, event) === false;
89 else 92 else
90 prevented |= handler.call(this, event) === false; 93 prevented |= handler.call(this, event) === false;
91 } 94 }
92 } 95 }
93 96
94 return !prevented && !event.defaultPrevented; 97 return !prevented && !event.defaultPrevented;
95 } 98 }
96 }; 99 };
97 100
98 // Export 101 // Export
99 return {EventTarget: EventTarget}; 102 return {EventTarget: EventTarget};
100 }); 103 });
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