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Side by Side Diff: third_party/polymer/v1_0/components-chromium/more-routing/emitter-extracted.js

Issue 1162963002: Revert "Rename polymer and cr_elements v0_8 to v1_0" (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 6 months ago
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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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