swiper/core/events/index.js

import { getDocument } from 'ssr-window';
import onTouchStart from './onTouchStart.js';
import onTouchMove from './onTouchMove.js';
import onTouchEnd from './onTouchEnd.js';
import onResize from './onResize.js';
import onClick from './onClick.js';
import onScroll from './onScroll.js';
let dummyEventAttached = false;

function dummyEventListener() {}

const events = (swiper, method) => {
  const document = getDocument();
  const {
    params,
    touchEvents,
    el,
    wrapperEl,
    device,
    support
  } = swiper;
  const capture = !!params.nested;
  const domMethod = method === 'on' ? 'addEventListener' : 'removeEventListener';
  const swiperMethod = method; // Touch Events

  if (!support.touch) {
    el[domMethod](touchEvents.start, swiper.onTouchStart, false);
    document[domMethod](touchEvents.move, swiper.onTouchMove, capture);
    document[domMethod](touchEvents.end, swiper.onTouchEnd, false);
  } else {
    const passiveListener = touchEvents.start === 'touchstart' && support.passiveListener && params.passiveListeners ? {
      passive: true,
      capture: false
    } : false;
    el[domMethod](touchEvents.start, swiper.onTouchStart, passiveListener);
    el[domMethod](touchEvents.move, swiper.onTouchMove, support.passiveListener ? {
      passive: false,
      capture
    } : capture);
    el[domMethod](touchEvents.end, swiper.onTouchEnd, passiveListener);

    if (touchEvents.cancel) {
      el[domMethod](touchEvents.cancel, swiper.onTouchEnd, passiveListener);
    }
  } // Prevent Links Clicks


  if (params.preventClicks || params.preventClicksPropagation) {
    el[domMethod]('click', swiper.onClick, true);
  }

  if (params.cssMode) {
    wrapperEl[domMethod]('scroll', swiper.onScroll);
  } // Resize handler


  if (params.updateOnWindowResize) {
    swiper[swiperMethod](device.ios || device.android ? 'resize orientationchange observerUpdate' : 'resize observerUpdate', onResize, true);
  } else {
    swiper[swiperMethod]('observerUpdate', onResize, true);
  }
};

function attachEvents() {
  const swiper = this;
  const document = getDocument();
  const {
    params,
    support
  } = swiper;
  swiper.onTouchStart = onTouchStart.bind(swiper);
  swiper.onTouchMove = onTouchMove.bind(swiper);
  swiper.onTouchEnd = onTouchEnd.bind(swiper);

  if (params.cssMode) {
    swiper.onScroll = onScroll.bind(swiper);
  }

  swiper.onClick = onClick.bind(swiper);

  if (support.touch && !dummyEventAttached) {
    document.addEventListener('touchstart', dummyEventListener);
    dummyEventAttached = true;
  }

  events(swiper, 'on');
}

function detachEvents() {
  const swiper = this;
  events(swiper, 'off');
}

export default {
  attachEvents,
  detachEvents
};