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Viewing file:     scrollLeft.js (2.04 KB)      -rw-r--r--

// Source from https://github.com/alitaheri/normalize-scroll-left
let cachedType;
/**
 * Based on the jquery plugin https://github.com/othree/jquery.rtl-scroll-type
 *
 * Types of scrollLeft, assuming scrollWidth=100 and direction is rtl.
 *
 * Type             | <- Most Left | Most Right -> | Initial
 * ---------------- | ------------ | ------------- | -------
 * default          | 0            | 100           | 100
 * negative (spec*) | -100         | 0             | 0
 * reverse          | 100          | 0             | 0
 *
 * Edge 85: default
 * Safari 14: negative
 * Chrome 85: negative
 * Firefox 81: negative
 * IE 11: reverse
 *
 * spec* https://drafts.csswg.org/cssom-view/#dom-window-scroll
 */

export function detectScrollType() {
  if (cachedType) {
    return cachedType;
  }

  const dummy = document.createElement('div');
  const container = document.createElement('div');
  container.style.width = '10px';
  container.style.height = '1px';
  dummy.appendChild(container);
  dummy.dir = 'rtl';
  dummy.style.fontSize = '14px';
  dummy.style.width = '4px';
  dummy.style.height = '1px';
  dummy.style.position = 'absolute';
  dummy.style.top = '-1000px';
  dummy.style.overflow = 'scroll';
  document.body.appendChild(dummy);
  cachedType = 'reverse';

  if (dummy.scrollLeft > 0) {
    cachedType = 'default';
  } else {
    dummy.scrollLeft = 1;

    if (dummy.scrollLeft === 0) {
      cachedType = 'negative';
    }
  }

  document.body.removeChild(dummy);
  return cachedType;
} // Based on https://stackoverflow.com/a/24394376

export function getNormalizedScrollLeft(element, direction) {
  const scrollLeft = element.scrollLeft; // Perform the calculations only when direction is rtl to avoid messing up the ltr bahavior

  if (direction !== 'rtl') {
    return scrollLeft;
  }

  const type = detectScrollType();

  switch (type) {
    case 'negative':
      return element.scrollWidth - element.clientWidth + scrollLeft;

    case 'reverse':
      return element.scrollWidth - element.clientWidth - scrollLeft;

    default:
      return scrollLeft;
  }
}