server/aspnetapp/wwwroot/lib/swiper/src/utils/class.js

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import Utils from './utils';

class SwiperClass {
  constructor(params = {}) {
    const self = this;
    self.params = params;

    // Events
    self.eventsListeners = {};

    if (self.params && self.params.on) {
      Object.keys(self.params.on).forEach((eventName) => {
        self.on(eventName, self.params.on[eventName]);
      });
    }
  }

  on(events, handler, priority) {
    const self = this;
    if (typeof handler !== 'function') return self;
    const method = priority ? 'unshift' : 'push';
    events.split(' ').forEach((event) => {
      if (!self.eventsListeners[event]) self.eventsListeners[event] = [];
      self.eventsListeners[event][method](handler);
    });
    return self;
  }

  once(events, handler, priority) {
    const self = this;
    if (typeof handler !== 'function') return self;
    function onceHandler(...args) {
      self.off(events, onceHandler);
      if (onceHandler.f7proxy) {
        delete onceHandler.f7proxy;
      }
      handler.apply(self, args);
    }
    onceHandler.f7proxy = handler;
    return self.on(events, onceHandler, priority);
  }

  off(events, handler) {
    const self = this;
    if (!self.eventsListeners) return self;
    events.split(' ').forEach((event) => {
      if (typeof handler === 'undefined') {
        self.eventsListeners[event] = [];
      } else if (self.eventsListeners[event] && self.eventsListeners[event].length) {
        self.eventsListeners[event].forEach((eventHandler, index) => {
          if (eventHandler === handler || (eventHandler.f7proxy && eventHandler.f7proxy === handler)) {
            self.eventsListeners[event].splice(index, 1);
          }
        });
      }
    });
    return self;
  }

  emit(...args) {