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✏️ Editing: lazy.js

import { getWindow } from 'ssr-window';
import $ from '../../shared/dom.js';
export default function Lazy(_ref) {
  let {
    swiper,
    extendParams,
    on,
    emit
  } = _ref;
  extendParams({
    lazy: {
      checkInView: false,
      enabled: false,
      loadPrevNext: false,
      loadPrevNextAmount: 1,
      loadOnTransitionStart: false,
      scrollingElement: '',
      elementClass: 'swiper-lazy',
      loadingClass: 'swiper-lazy-loading',
      loadedClass: 'swiper-lazy-loaded',
      preloaderClass: 'swiper-lazy-preloader'
    }
  });
  swiper.lazy = {};
  let scrollHandlerAttached = false;
  let initialImageLoaded = false;

function loadInSlide(index, loadInDuplicate) {
    if (loadInDuplicate === void 0) {
      loadInDuplicate = true;
    }

if ($slideEl.hasClass(params.elementClass) && !$slideEl.hasClass(params.loadedClass) && !$slideEl.hasClass(params.loadingClass)) {
      $images.push($slideEl[0]);
    }

if ($images.length === 0) return;
    $images.each(imageEl => {
      const $imageEl = $(imageEl);
      $imageEl.addClass(params.loadingClass);
      const background = $imageEl.attr('data-background');
      const src = $imageEl.attr('data-src');
      const srcset = $imageEl.attr('data-srcset');
      const sizes = $imageEl.attr('data-sizes');
      const $pictureEl = $imageEl.parent('picture');
      swiper.loadImage($imageEl[0], src || background, srcset, sizes, false, () => {
        if (typeof swiper === 'undefined' || swiper === null || !swiper || swiper && !swiper.params || swiper.destroyed) return;

if (background) {
          $imageEl.css('background-image', `url("${background}")`);
          $imageEl.removeAttr('data-background');
        } else {
          if (srcset) {
            $imageEl.attr('srcset', srcset);
            $imageEl.removeAttr('data-srcset');
          }

if (sizes) {
            $imageEl.attr('sizes', sizes);
            $imageEl.removeAttr('data-sizes');
          }

if ($pictureEl.length) {
            $pictureEl.children('source').each(sourceEl => {
              const $source = $(sourceEl);

if ($source.attr('data-srcset')) {
                $source.attr('srcset', $source.attr('data-srcset'));
                $source.removeAttr('data-srcset');
              }
            });
          }

if (src) {
            $imageEl.attr('src', src);
            $imageEl.removeAttr('data-src');
          }
        }

$imageEl.addClass(params.loadedClass).removeClass(params.loadingClass);
        $slideEl.find(`.${params.preloaderClass}`).remove();

if (swiper.params.loop && loadInDuplicate) {
          const slideOriginalIndex = $slideEl.attr('data-swiper-slide-index');

if ($slideEl.hasClass(swiper.params.slideDuplicateClass)) {
            const originalSlide = swiper.$wrapperEl.children(`[data-swiper-slide-index="${slideOriginalIndex}"]:not(.${swiper.params.slideDuplicateClass})`);
            loadInSlide(originalSlide.index(), false);
          } else {
            const duplicatedSlide = swiper.$wrapperEl.children(`.${swiper.params.slideDuplicateClass}[data-swiper-slide-index="${slideOriginalIndex}"]`);
            loadInSlide(duplicatedSlide.index(), false);
          }
        }

emit('lazyImageReady', $slideEl[0], $imageEl[0]);

if (swiper.params.autoHeight) {
          swiper.updateAutoHeight();
        }
      });
      emit('lazyImageLoad', $slideEl[0], $imageEl[0]);
    });
  }

function load() {
    const {
      $wrapperEl,
      params: swiperParams,
      slides,
      activeIndex
    } = swiper;
    const isVirtual = swiper.virtual && swiperParams.virtual.enabled;
    const params = swiperParams.lazy;
    let slidesPerView = swiperParams.slidesPerView;

if (slidesPerView === 'auto') {
      slidesPerView = 0;
    }

function slideExist(index) {
      if (isVirtual) {
        if ($wrapperEl.children(`.${swiperParams.slideClass}[data-swiper-slide-index="${index}"]`).length) {
          return true;
        }
      } else if (slides[index]) return true;

return false;
    }

function slideIndex(slideEl) {
      if (isVirtual) {
        return $(slideEl).attr('data-swiper-slide-index');
      }

return $(slideEl).index();
    }

if (!initialImageLoaded) initialImageLoaded = true;

if (swiper.params.watchSlidesProgress) {
      $wrapperEl.children(`.${swiperParams.slideVisibleClass}`).each(slideEl => {
        const index = isVirtual ? $(slideEl).attr('data-swiper-slide-index') : $(slideEl).index();
        loadInSlide(index);
      });
    } else if (slidesPerView > 1) {
      for (let i = activeIndex; i < activeIndex + slidesPerView; i += 1) {
        if (slideExist(i)) loadInSlide(i);
      }
    } else {
      loadInSlide(activeIndex);
    }

if (params.loadPrevNext) {
      if (slidesPerView > 1 || params.loadPrevNextAmount && params.loadPrevNextAmount > 1) {
        const amount = params.loadPrevNextAmount;
        const spv = Math.ceil(slidesPerView);
        const maxIndex = Math.min(activeIndex + spv + Math.max(amount, spv), slides.length);
        const minIndex = Math.max(activeIndex - Math.max(spv, amount), 0); // Next Slides

for (let i = activeIndex + spv; i < maxIndex; i += 1) {
          if (slideExist(i)) loadInSlide(i);
        } // Prev Slides

for (let i = minIndex; i < activeIndex; i += 1) {
          if (slideExist(i)) loadInSlide(i);
        }
      } else {
        const nextSlide = $wrapperEl.children(`.${swiperParams.slideNextClass}`);
        if (nextSlide.length > 0) loadInSlide(slideIndex(nextSlide));
        const prevSlide = $wrapperEl.children(`.${swiperParams.slidePrevClass}`);
        if (prevSlide.length > 0) loadInSlide(slideIndex(prevSlide));
      }
    }
  }

function checkInViewOnLoad() {
    const window = getWindow();
    if (!swiper || swiper.destroyed) return;
    const $scrollElement = swiper.params.lazy.scrollingElement ? $(swiper.params.lazy.scrollingElement) : $(window);
    const isWindow = $scrollElement[0] === window;
    const scrollElementWidth = isWindow ? window.innerWidth : $scrollElement[0].offsetWidth;
    const scrollElementHeight = isWindow ? window.innerHeight : $scrollElement[0].offsetHeight;
    const swiperOffset = swiper.$el.offset();
    const {
      rtlTranslate: rtl
    } = swiper;
    let inView = false;
    if (rtl) swiperOffset.left -= swiper.$el[0].scrollLeft;
    const swiperCoord = [[swiperOffset.left, swiperOffset.top], [swiperOffset.left + swiper.width, swiperOffset.top], [swiperOffset.left, swiperOffset.top + swiper.height], [swiperOffset.left + swiper.width, swiperOffset.top + swiper.height]];

for (let i = 0; i < swiperCoord.length; i += 1) {
      const point = swiperCoord[i];

if (point[0] >= 0 && point[0] <= scrollElementWidth && point[1] >= 0 && point[1] <= scrollElementHeight) {
        if (point[0] === 0 && point[1] === 0) continue; // eslint-disable-line

inView = true;
      }
    }

const passiveListener = swiper.touchEvents.start === 'touchstart' && swiper.support.passiveListener && swiper.params.passiveListeners ? {
      passive: true,
      capture: false
    } : false;

if (inView) {
      load();
      $scrollElement.off('scroll', checkInViewOnLoad, passiveListener);
    } else if (!scrollHandlerAttached) {
      scrollHandlerAttached = true;
      $scrollElement.on('scroll', checkInViewOnLoad, passiveListener);
    }
  }

on('beforeInit', () => {
    if (swiper.params.lazy.enabled && swiper.params.preloadImages) {
      swiper.params.preloadImages = false;
    }
  });
  on('init', () => {
    if (swiper.params.lazy.enabled) {
      if (swiper.params.lazy.checkInView) {
        checkInViewOnLoad();
      } else {
        load();
      }
    }
  });
  on('scroll', () => {
    if (swiper.params.freeMode && swiper.params.freeMode.enabled && !swiper.params.freeMode.sticky) {
      load();
    }
  });
  on('scrollbarDragMove resize _freeModeNoMomentumRelease', () => {
    if (swiper.params.lazy.enabled) {
      if (swiper.params.lazy.checkInView) {
        checkInViewOnLoad();
      } else {
        load();
      }
    }
  });
  on('transitionStart', () => {
    if (swiper.params.lazy.enabled) {
      if (swiper.params.lazy.loadOnTransitionStart || !swiper.params.lazy.loadOnTransitionStart && !initialImageLoaded) {
        if (swiper.params.lazy.checkInView) {
          checkInViewOnLoad();
        } else {
          load();
        }
      }
    }
  });
  on('transitionEnd', () => {
    if (swiper.params.lazy.enabled && !swiper.params.lazy.loadOnTransitionStart) {
      if (swiper.params.lazy.checkInView) {
        checkInViewOnLoad();
      } else {
        load();
      }
    }
  });
  on('slideChange', () => {
    const {
      lazy,
      cssMode,
      watchSlidesProgress,
      touchReleaseOnEdges,
      resistanceRatio
    } = swiper.params;

if (lazy.enabled && (cssMode || watchSlidesProgress && (touchReleaseOnEdges || resistanceRatio === 0))) {
      load();
    }
  });
  on('destroy', () => {
    if (!swiper.$el) return;
    swiper.$el.find(`.${swiper.params.lazy.loadingClass}`).removeClass(swiper.params.lazy.loadingClass);
  });
  Object.assign(swiper.lazy, {
    load,
    loadInSlide
  });
}

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