1 | 'use strict';
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 | exports.EventEmitter = EventEmitter;
|
8 |
|
9 |
|
10 |
|
11 |
|
12 | var objToString = Object.prototype.toString;
|
13 |
|
14 |
|
15 |
|
16 |
|
17 |
|
18 |
|
19 |
|
20 |
|
21 | function isArray (val) {
|
22 | return objToString.call(val) === '[object Array]';
|
23 | }
|
24 |
|
25 |
|
26 |
|
27 |
|
28 |
|
29 |
|
30 | function EventEmitter () {}
|
31 |
|
32 |
|
33 |
|
34 |
|
35 |
|
36 |
|
37 |
|
38 |
|
39 |
|
40 | EventEmitter.prototype.on = function (name, fn) {
|
41 | if (!this.$events) {
|
42 | this.$events = {};
|
43 | }
|
44 |
|
45 | if (!this.$events[name]) {
|
46 | this.$events[name] = fn;
|
47 | } else if (isArray(this.$events[name])) {
|
48 | this.$events[name].push(fn);
|
49 | } else {
|
50 | this.$events[name] = [this.$events[name], fn];
|
51 | }
|
52 |
|
53 | return this;
|
54 | };
|
55 |
|
56 | EventEmitter.prototype.addListener = EventEmitter.prototype.on;
|
57 |
|
58 |
|
59 |
|
60 |
|
61 |
|
62 |
|
63 |
|
64 |
|
65 |
|
66 | EventEmitter.prototype.once = function (name, fn) {
|
67 | var self = this;
|
68 |
|
69 | function on () {
|
70 | self.removeListener(name, on);
|
71 | fn.apply(this, arguments);
|
72 | }
|
73 |
|
74 | on.listener = fn;
|
75 | this.on(name, on);
|
76 |
|
77 | return this;
|
78 | };
|
79 |
|
80 |
|
81 |
|
82 |
|
83 |
|
84 |
|
85 |
|
86 |
|
87 |
|
88 | EventEmitter.prototype.removeListener = function (name, fn) {
|
89 | if (this.$events && this.$events[name]) {
|
90 | var list = this.$events[name];
|
91 |
|
92 | if (isArray(list)) {
|
93 | var pos = -1;
|
94 |
|
95 | for (var i = 0, l = list.length; i < l; i++) {
|
96 | if (list[i] === fn || (list[i].listener && list[i].listener === fn)) {
|
97 | pos = i;
|
98 | break;
|
99 | }
|
100 | }
|
101 |
|
102 | if (pos < 0) {
|
103 | return this;
|
104 | }
|
105 |
|
106 | list.splice(pos, 1);
|
107 |
|
108 | if (!list.length) {
|
109 | delete this.$events[name];
|
110 | }
|
111 | } else if (list === fn || (list.listener && list.listener === fn)) {
|
112 | delete this.$events[name];
|
113 | }
|
114 | }
|
115 |
|
116 | return this;
|
117 | };
|
118 |
|
119 |
|
120 |
|
121 |
|
122 |
|
123 |
|
124 |
|
125 |
|
126 | EventEmitter.prototype.removeAllListeners = function (name) {
|
127 | if (name === undefined) {
|
128 | this.$events = {};
|
129 | return this;
|
130 | }
|
131 |
|
132 | if (this.$events && this.$events[name]) {
|
133 | this.$events[name] = null;
|
134 | }
|
135 |
|
136 | return this;
|
137 | };
|
138 |
|
139 |
|
140 |
|
141 |
|
142 |
|
143 |
|
144 |
|
145 |
|
146 | EventEmitter.prototype.listeners = function (name) {
|
147 | if (!this.$events) {
|
148 | this.$events = {};
|
149 | }
|
150 |
|
151 | if (!this.$events[name]) {
|
152 | this.$events[name] = [];
|
153 | }
|
154 |
|
155 | if (!isArray(this.$events[name])) {
|
156 | this.$events[name] = [this.$events[name]];
|
157 | }
|
158 |
|
159 | return this.$events[name];
|
160 | };
|
161 |
|
162 |
|
163 |
|
164 |
|
165 |
|
166 |
|
167 |
|
168 |
|
169 | EventEmitter.prototype.emit = function (name) {
|
170 | if (!this.$events) {
|
171 | return false;
|
172 | }
|
173 |
|
174 | var handler = this.$events[name];
|
175 |
|
176 | if (!handler) {
|
177 | return false;
|
178 | }
|
179 |
|
180 | var args = Array.prototype.slice.call(arguments, 1);
|
181 |
|
182 | if (typeof handler === 'function') {
|
183 | handler.apply(this, args);
|
184 | } else if (isArray(handler)) {
|
185 | var listeners = handler.slice();
|
186 |
|
187 | for (var i = 0, l = listeners.length; i < l; i++) {
|
188 | listeners[i].apply(this, args);
|
189 | }
|
190 | } else {
|
191 | return false;
|
192 | }
|
193 |
|
194 | return true;
|
195 | };
|