server/aspnetapp/wwwroot/lib/swiper/src/components/virtual/virtual.js

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import $ from '../../utils/dom';
import Utils from '../../utils/utils';

const Virtual = {
  update(force) {
    const swiper = this;
    const { slidesPerView, slidesPerGroup, centeredSlides } = swiper.params;
    const { addSlidesBefore, addSlidesAfter } = swiper.params.virtual;
    const {
      from: previousFrom,
      to: previousTo,
      slides,
      slidesGrid: previousSlidesGrid,
      renderSlide,
      offset: previousOffset,
    } = swiper.virtual;
    swiper.updateActiveIndex();
    const activeIndex = swiper.activeIndex || 0;

    let offsetProp;
    if (swiper.rtlTranslate) offsetProp = 'right';
    else offsetProp = swiper.isHorizontal() ? 'left' : 'top';

    let slidesAfter;
    let slidesBefore;
    if (centeredSlides) {
      slidesAfter = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesBefore;
      slidesBefore = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesAfter;
    } else {
      slidesAfter = slidesPerView + (slidesPerGroup - 1) + addSlidesBefore;
      slidesBefore = slidesPerGroup + addSlidesAfter;
    }
    const from = Math.max((activeIndex || 0) - slidesBefore, 0);
    const to = Math.min((activeIndex || 0) + slidesAfter, slides.length - 1);
    const offset = (swiper.slidesGrid[from] || 0) - (swiper.slidesGrid[0] || 0);

    Utils.extend(swiper.virtual, {
      from,
      to,
      offset,
      slidesGrid: swiper.slidesGrid,
    });

    function onRendered() {
      swiper.updateSlides();
      swiper.updateProgress();
      swiper.updateSlidesClasses();
      if (swiper.lazy && swiper.params.lazy.enabled) {
        swiper.lazy.load();
      }
    }

    if (previousFrom === from && previousTo === to && !force) {
      if (swiper.slidesGrid !== previousSlidesGrid && offset !== previousOffset) {
        swiper.slides.css(offsetProp, `${offset}px`);
      }
      swiper.updateProgress();
      return;
    }
    if (swiper.params.virtual.renderExternal) {
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