module.exports = function()

in slides/custom/asset/common/perfect-scrollbar/0.6.8/js/perfect-scrollbar.js [1364:1437]
67 lines of code
13 McCabe index (conditional complexity)

module.exports = function (element) {
  var i = instances.get(element);

  i.containerWidth = element.clientWidth;
  i.containerHeight = element.clientHeight;
  i.contentWidth = element.scrollWidth;
  i.contentHeight = element.scrollHeight;

  var existingRails;
  if (!element.contains(i.scrollbarXRail)) {
    existingRails = d.queryChildren(element, '.ps-scrollbar-x-rail');
    if (existingRails.length > 0) {
      existingRails.forEach(function (rail) {
        d.remove(rail);
      });
    }
    d.appendTo(i.scrollbarXRail, element);
  }
  if (!element.contains(i.scrollbarYRail)) {
    existingRails = d.queryChildren(element, '.ps-scrollbar-y-rail');
    if (existingRails.length > 0) {
      existingRails.forEach(function (rail) {
        d.remove(rail);
      });
    }
    d.appendTo(i.scrollbarYRail, element);
  }

  if (!i.settings.suppressScrollX && i.containerWidth + i.settings.scrollXMarginOffset < i.contentWidth) {
    i.scrollbarXActive = true;
    i.railXWidth = i.containerWidth - i.railXMarginWidth;
    i.railXRatio = i.containerWidth / i.railXWidth;
    i.scrollbarXWidth = getThumbSize(i, h.toInt(i.railXWidth * i.containerWidth / i.contentWidth));
    i.scrollbarXLeft = h.toInt((i.negativeScrollAdjustment + element.scrollLeft) * (i.railXWidth - i.scrollbarXWidth) / (i.contentWidth - i.containerWidth));
  } else {
    i.scrollbarXActive = false;
  }

  if (!i.settings.suppressScrollY && i.containerHeight + i.settings.scrollYMarginOffset < i.contentHeight) {
    i.scrollbarYActive = true;
    i.railYHeight = i.containerHeight - i.railYMarginHeight;
    i.railYRatio = i.containerHeight / i.railYHeight;
    i.scrollbarYHeight = getThumbSize(i, h.toInt(i.railYHeight * i.containerHeight / i.contentHeight));
    i.scrollbarYTop = h.toInt(element.scrollTop * (i.railYHeight - i.scrollbarYHeight) / (i.contentHeight - i.containerHeight));
  } else {
    i.scrollbarYActive = false;
  }

  if (i.scrollbarXLeft >= i.railXWidth - i.scrollbarXWidth) {
    i.scrollbarXLeft = i.railXWidth - i.scrollbarXWidth;
  }
  if (i.scrollbarYTop >= i.railYHeight - i.scrollbarYHeight) {
    i.scrollbarYTop = i.railYHeight - i.scrollbarYHeight;
  }

  updateCss(element, i);

  if (i.scrollbarXActive) {
    cls.add(element, 'ps-active-x');
  } else {
    cls.remove(element, 'ps-active-x');
    i.scrollbarXWidth = 0;
    i.scrollbarXLeft = 0;
    updateScroll(element, 'left', 0);
  }
  if (i.scrollbarYActive) {
    cls.add(element, 'ps-active-y');
  } else {
    cls.remove(element, 'ps-active-y');
    i.scrollbarYHeight = 0;
    i.scrollbarYTop = 0;
    updateScroll(element, 'top', 0);
  }
};