signal-desktop/libtextsecure/event_target.js
Scott Nonnenberg 754d65ae2e Let's make it all pretty, shall we?
We missed a couple directories with previous attempts to turn this on
globally: app/ and libtextsecure/

Not to mention files in places we didn't expect: ts files that weren't
in the ts directory!

This turns prettier on for every file we care about (js, ts, tsx, md)
everywhere in the project but for a few key parts.
2018-05-02 13:40:57 -07:00

79 lines
2.3 KiB
JavaScript

/*
* Implements EventTarget
* https://developer.mozilla.org/en-US/docs/Web/API/EventTarget
*/
(function() {
'use strict';
window.textsecure = window.textsecure || {};
function EventTarget() {}
EventTarget.prototype = {
constructor: EventTarget,
dispatchEvent: function(ev) {
if (!(ev instanceof Event)) {
throw new Error('Expects an event');
}
if (this.listeners === null || typeof this.listeners !== 'object') {
this.listeners = {};
}
var listeners = this.listeners[ev.type];
var results = [];
if (typeof listeners === 'object') {
for (var i = 0, max = listeners.length; i < max; i += 1) {
var listener = listeners[i];
if (typeof listener === 'function') {
results.push(listener.call(null, ev));
}
}
}
return results;
},
addEventListener: function(eventName, callback) {
if (typeof eventName !== 'string') {
throw new Error('First argument expects a string');
}
if (typeof callback !== 'function') {
throw new Error('Second argument expects a function');
}
if (this.listeners === null || typeof this.listeners !== 'object') {
this.listeners = {};
}
var listeners = this.listeners[eventName];
if (typeof listeners !== 'object') {
listeners = [];
}
listeners.push(callback);
this.listeners[eventName] = listeners;
},
removeEventListener: function(eventName, callback) {
if (typeof eventName !== 'string') {
throw new Error('First argument expects a string');
}
if (typeof callback !== 'function') {
throw new Error('Second argument expects a function');
}
if (this.listeners === null || typeof this.listeners !== 'object') {
this.listeners = {};
}
var listeners = this.listeners[eventName];
if (typeof listeners === 'object') {
for (var i = 0; i < listeners.length; ++i) {
if (listeners[i] === callback) {
listeners.splice(i, 1);
return;
}
}
}
this.listeners[eventName] = listeners;
},
extend: function(obj) {
for (var prop in obj) {
this[prop] = obj[prop];
}
return this;
},
};
textsecure.EventTarget = EventTarget;
})();