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import { isFunction } from '@/utils' /** * Dispatch a custom browser event... */ export function dispatch(event, payload) { document.dispatchEvent(new CustomEvent('synthetic:'+event, { detail: payload })) } /** * Our internal event listener bus... */ let listeners = [] /** * Register a callback to run when an event is triggered... */ export function on(name, callback) { if (! listeners[name]) listeners[name] = [] listeners[name].push(callback) // Return an "off" callback to remove the listener... return () => { listeners[name] = listeners[name].filter(i => i !== callback) } } /** * In addition to triggering an event, this method allows you to * defer running callbacks returned from listeners and pass a * value through each one so they can act like middleware. * * An example of using this combination to the fullest: * * // First let's look at the triggering phase: * let finish = trigger([event name], ...[event params]) * * return finish([pass-through value]) * * // Now, let's look at the "listening" phase: * on([event name], (...[event params]) => { * // The contents of this callback will be run immediately on trigger. * * return ([pass-through value]) => { * // This callback will be run when "finish()" is called. * * // The [pass-through value] can be mutated and must * // be returned for the next callback to process. * return [pass-through value] * } * }) */ export function trigger(name, ...params) { let callbacks = listeners[name] || [] let finishers = [] for (let i = 0; i < callbacks.length; i++) { let finisher = callbacks[i](...params) if (isFunction(finisher)) finishers.push(finisher) } return (result) => { let latest = result for (let i = 0; i < finishers.length; i++) { let iResult = finishers[i](latest) if (iResult !== undefined) { latest = iResult } } return latest } }
