react-slick/lib/utils/trackUtils.js

React port of slick carousel

'use strict';

exports.__esModule = true;
exports.siblingDirection = siblingDirection;
exports.slidesOnRight = slidesOnRight;
exports.slidesOnLeft = slidesOnLeft;
var getPreClones = exports.getPreClones = function getPreClones(spec) {
  if (spec.unslick || !spec.infinite) {
    return 0;
  }
  if (spec.variableWidth) {
    return spec.slideCount;
  }
  return spec.slidesToShow + (spec.centerMode ? 1 : 0);
};

var getPostClones = exports.getPostClones = function getPostClones(spec) {
  if (spec.unslick || !spec.infinite) {
    return 0;
  }
  return spec.slideCount;
};

var getTotalSlides = exports.getTotalSlides = function getTotalSlides(spec) {
  return spec.slideCount === 1 ? 1 : getPreClones(spec) + spec.slideCount + getPostClones(spec);
};

function siblingDirection(_ref) {
  var currentSlide = _ref.currentSlide,
      targetSlide = _ref.targetSlide,
      slidesToShow = _ref.slidesToShow,
      centerMode = _ref.centerMode,
      rtl = _ref.rtl;

  if (targetSlide > currentSlide) {
    if (targetSlide > currentSlide + slidesOnRight(slidesToShow, centerMode, rtl)) {
      return 'left';
    }
    return 'right';
  } else {
    if (targetSlide < currentSlide - slidesOnLeft(slidesToShow, centerMode, rtl)) {
      return 'right';
    }
    return 'left';
  }
}

function slidesOnRight(slidesToShow, centerMode, rtl) {
  // returns no of slides on the right of active slide
  if (centerMode) {
    var right = (slidesToShow - 1) / 2 + 1;
    if (rtl && slidesToShow % 2 === 0) right += 1;
    return right;
  }
  if (rtl) {
    return 0;
  }
  return slidesToShow - 1;
}

function slidesOnLeft(slidesToShow, centerMode, rtl) {
  // returns no of slides on the left of active slide
  if (centerMode) {
    var left = (slidesToShow - 1) / 2 + 1;
    if (!rtl && slidesToShow % 2 === 0) left += 1;
    return left;
  }
  if (rtl) {
    return slidesToShow - 1;
  }
  return 0;
}