swiper/esm/components/core/loop/loopFix.js

Most modern mobile touch slider and framework with hardware accelerated transitions

export default function loopFix() {
  var swiper = this;
  swiper.emit('beforeLoopFix');
  var activeIndex = swiper.activeIndex,
      slides = swiper.slides,
      loopedSlides = swiper.loopedSlides,
      allowSlidePrev = swiper.allowSlidePrev,
      allowSlideNext = swiper.allowSlideNext,
      snapGrid = swiper.snapGrid,
      rtl = swiper.rtlTranslate;
  var newIndex;
  swiper.allowSlidePrev = true;
  swiper.allowSlideNext = true;
  var snapTranslate = -snapGrid[activeIndex];
  var diff = snapTranslate - swiper.getTranslate(); // Fix For Negative Oversliding

  if (activeIndex < loopedSlides) {
    newIndex = slides.length - loopedSlides * 3 + activeIndex;
    newIndex += loopedSlides;
    var slideChanged = swiper.slideTo(newIndex, 0, false, true);

    if (slideChanged && diff !== 0) {
      swiper.setTranslate((rtl ? -swiper.translate : swiper.translate) - diff);
    }
  } else if (activeIndex >= slides.length - loopedSlides) {
    // Fix For Positive Oversliding
    newIndex = -slides.length + activeIndex + loopedSlides;
    newIndex += loopedSlides;

    var _slideChanged = swiper.slideTo(newIndex, 0, false, true);

    if (_slideChanged && diff !== 0) {
      swiper.setTranslate((rtl ? -swiper.translate : swiper.translate) - diff);
    }
  }

  swiper.allowSlidePrev = allowSlidePrev;
  swiper.allowSlideNext = allowSlideNext;
  swiper.emit('loopFix');
}