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| (Empty) |
1 | |
2 (function(scope) { | |
3 var MoreRouting = scope.MoreRouting = scope.MoreRouting || {}; | |
4 MoreRouting.Emitter = Object.create(null); // Minimal set of properties. | |
5 | |
6 /** | |
7 * A dumb prototype that provides very simple event subscription. | |
8 * | |
9 * You are responsible for initializing `__listeners` as an array on objects | |
10 * that make use of this. | |
11 */ | |
12 Object.defineProperties(MoreRouting.Emitter, { | |
13 | |
14 /** | |
15 * Registers a callback that will be called each time any parameter managed by | |
16 * this object (or its parents) have changed. | |
17 * | |
18 * @param {!Function} callback | |
19 * @return {{close: function()}} | |
20 */ | |
21 __subscribe: { | |
22 value: function __subscribe(callback) { | |
23 this.__listeners.push(callback); | |
24 | |
25 return { | |
26 close: this.__unsubscribe.bind(this, callback), | |
27 }; | |
28 }, | |
29 }, | |
30 | |
31 /** | |
32 * Unsubscribes a previously registered callback. | |
33 * | |
34 * @param {!Function} callback | |
35 */ | |
36 __unsubscribe: { | |
37 value: function __unsubscribe(callback) { | |
38 var index = this.__listeners.indexOf(callback); | |
39 if (index < 0) { | |
40 console.warn(this, 'attempted unsubscribe of unregistered listener:', ca
llback); | |
41 return; | |
42 } | |
43 this.__listeners.splice(index, 1); | |
44 }, | |
45 }, | |
46 | |
47 /** | |
48 * Notifies subscribed callbacks. | |
49 */ | |
50 __notify: { | |
51 value: function __notify(key, value) { | |
52 if (this.__silent) return; | |
53 var args = Array.prototype.slice.call(arguments); | |
54 // Notify listeners on parents first. | |
55 var parent = Object.getPrototypeOf(this); | |
56 if (parent && parent.__notify && parent.__listeners) { | |
57 parent.__notify.apply(parent, args); | |
58 } | |
59 | |
60 this.__listeners.forEach(function(listener) { | |
61 listener.apply(null, args); | |
62 }.bind(this)); | |
63 }, | |
64 }, | |
65 | |
66 }); | |
67 | |
68 })(window); | |
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