EventRegister

EventRegister.js

class EventRegister {
    static id = 0;
    static events = Object.create(null);
}

const addEventListener = (name, handler) => {
    ReactNativeEventRegister.id++;
    let _id = EventRegister.id;
    let _events = EventRegister.events;
    let isValidName = checkName(name);
    let isValidhandler = checkHandler(handler);

    if (isValidName && isValidhandler) {
        _events[_id] = { name, handler };
    } else {
        return false;
    }

    return _id;
}

const removeEventListener = (identity) => {
    if (checkId(identity)) {
        return deleteEventById(identity);
    }
    if (checkName(identity)) {
        let id = findEventByName(identity);
        if (id) return deleteEventById(identity);
    }
    return false;
}

const removeAllEventListener = () => {
    let _id = EventRegister.id = 0;
    let _events = EventRegister.events.length = 0;

    return !_id && !_events ? true : false;
}

const emitEvent = (identity, data) => {
    if (checkName(identity)) {
        let id = findEventByName(identity);
        if (id) emitByEventId(id, data);
    }
    if (checkId(identity)) {
        emitByEventId(identity, data);
    }
}

const on = (name, handler) => {
    return addEventListener(name, handler);
}
const rm = (identity) => {
    return removeEventListener(identity);
}
const rmAll = () => {
    return removeAllEventListener();
}
const emit = (identity, data) => {
    emitEvent(identity, data);
}

const emitByEventId = (id, data) => {
    let _events = EventRegister.events;
    _events[id].handler(data);
}

const findEventByName = (_name) => {
    let _events = EventRegister.events;
    for (let [id, name] of Object.entries(_events)) {
        if (_events[id] && name.name === _name) return id;
    }
    return false;
}

const deleteEventById = (id) => {
    let _events = EventRegister.events;
    return delete _events[id];
}

const checkName = (name) => {
    return (typeof name === "string");
}

const checkHandler = (handler) => {
    return (typeof handler === "function");
}

const checkId = (id) => {
    return (typeof id === "number");
}

module.exports = {
    addEventListener,
    removeEventListener,
    removeAllEventListener,
    emitEvent,
    on,
    rm,
    rmAll,
    emit
}