@gechiui/dom/build-module/dom/get-offset-parent.js

DOM utilities module for GeChiUI.

/**
 * Internal dependencies
 */
import getComputedStyle from './get-computed-style';
/**
 * Returns the closest positioned element, or null under any of the conditions
 * of the offsetParent specification. Unlike offsetParent, this function is not
 * limited to HTMLElement and accepts any Node (e.g. Node.TEXT_NODE).
 *
 * @see https://drafts.csswg.org/cssom-view/#dom-htmlelement-offsetparent
 *
 * @param {Node} node Node from which to find offset parent.
 *
 * @return {Node | null} Offset parent.
 */

export default function getOffsetParent(node) {
  // Cannot retrieve computed style or offset parent only anything other than
  // an element node, so find the closest element node.
  let closestElement;

  while (closestElement =
  /** @type {Node} */
  node.parentNode) {
    if (closestElement.nodeType === closestElement.ELEMENT_NODE) {
      break;
    }
  }

  if (!closestElement) {
    return null;
  } // If the closest element is already positioned, return it, as offsetParent
  // does not otherwise consider the node itself.


  if (getComputedStyle(
  /** @type {Element} */
  closestElement).position !== 'static') {
    return closestElement;
  } // offsetParent is undocumented/draft


  return (
    /** @type {Node & { offsetParent: Node }} */
    closestElement.offsetParent
  );
}
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