jcore-ui/bin/lib/utils/EventEmitter.js

jcore-ui - components for building an interface

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class EventEmitter {
    constructor() {
        this.events = {};
    }
    on(event, listener) {
        if (typeof this.events[event] !== 'object') {
            this.events[event] = [];
        }
        this.events[event].push(listener);
        return () => this.removeListener(event, listener);
    }
    removeListener(event, listener) {
        if (typeof this.events[event] === 'object') {
            const idx = this.events[event].indexOf(listener);
            if (idx > -1) {
                this.events[event].splice(idx, 1);
            }
        }
    }
    emit(event, ...args) {
        if (typeof this.events[event] === 'object') {
            this.events[event].forEach((listener) => listener.apply(this, args));
        }
    }
    once(event, listener) {
        const remove = this.on(event, (...args) => {
            remove();
            listener.apply(this, args);
        });
    }
}
;
exports.default = EventEmitter;
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