open-consul/ui-v2/app/utils/dom/event-target/rsvp.js

64 lines
1.9 KiB
JavaScript

// Simple RSVP.EventTarget wrapper to make it more like a standard EventTarget
import RSVP from 'rsvp';
// See https://github.com/mysticatea/event-target-shim/blob/v4.0.2/src/event.mjs
// The MIT License (MIT) - Copyright (c) 2015 Toru Nagashima
import { setCurrentTarget, wrapEvent } from './event-target-shim/event';
const EventTarget = function() {};
function callbacksFor(object) {
let callbacks = object._promiseCallbacks;
if (!callbacks) {
callbacks = object._promiseCallbacks = {};
}
return callbacks;
}
EventTarget.prototype = Object.assign(
Object.create(Object.prototype, {
constructor: {
value: EventTarget,
configurable: true,
writable: true,
},
}),
{
dispatchEvent: function(obj) {
// borrow just what I need from event-target-shim
// to make true events even ErrorEvents with targets
const wrappedEvent = wrapEvent(this, obj);
setCurrentTarget(wrappedEvent, null);
// RSVP trigger doesn't bind to `this`
// the rest is pretty much the contents of `trigger`
// but with a `.bind(this)` to make it compatible
// with standard EventTarget
// we use `let` and `callbacksFor` above, just to keep things the same as rsvp.js
const eventName = obj.type;
const options = wrappedEvent;
let allCallbacks = callbacksFor(this);
let callbacks = allCallbacks[eventName];
if (callbacks) {
// Don't cache the callbacks.length since it may grow
let callback;
for (let i = 0; i < callbacks.length; i++) {
callback = callbacks[i];
callback.bind(this)(options);
}
}
},
addEventListener: function(event, cb) {
this.on(event, cb);
},
removeEventListener: function(event, cb) {
try {
this.off(event, cb);
} catch (e) {
// passthrough
}
},
}
);
RSVP.EventTarget.mixin(EventTarget.prototype);
export default EventTarget;