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Viewing file:     observer.js (1.99 KB)      -rwxrwxr-x

import { getWindow } from 'ssr-window';
export default function Observer({
  swiper,
  extendParams,
  on,
  emit
}) {
  const observers = [];
  const window = getWindow();

  const attach = (target, options = {}) => {
    const ObserverFunc = window.MutationObserver || window.WebkitMutationObserver;
    const observer = new ObserverFunc(mutations => {
      // The observerUpdate event should only be triggered
      // once despite the number of mutations.  Additional
      // triggers are redundant and are very costly
      if (mutations.length === 1) {
        emit('observerUpdate', mutations[0]);
        return;
      }

      const observerUpdate = function observerUpdate() {
        emit('observerUpdate', mutations[0]);
      };

      if (window.requestAnimationFrame) {
        window.requestAnimationFrame(observerUpdate);
      } else {
        window.setTimeout(observerUpdate, 0);
      }
    });
    observer.observe(target, {
      attributes: typeof options.attributes === 'undefined' ? true : options.attributes,
      childList: typeof options.childList === 'undefined' ? true : options.childList,
      characterData: typeof options.characterData === 'undefined' ? true : options.characterData
    });
    observers.push(observer);
  };

  const init = () => {
    if (!swiper.params.observer) return;

    if (swiper.params.observeParents) {
      const containerParents = swiper.$el.parents();

      for (let i = 0; i < containerParents.length; i += 1) {
        attach(containerParents[i]);
      }
    } // Observe container


    attach(swiper.$el[0], {
      childList: swiper.params.observeSlideChildren
    }); // Observe wrapper

    attach(swiper.$wrapperEl[0], {
      attributes: false
    });
  };

  const destroy = () => {
    observers.forEach(observer => {
      observer.disconnect();
    });
    observers.splice(0, observers.length);
  };

  extendParams({
    observer: false,
    observeParents: false,
    observeSlideChildren: false
  });
  on('init', init);
  on('destroy', destroy);
}