@wordpress/dom/build/dom/get-offset-parent.js

DOM utilities module for WordPress.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getOffsetParent;
var _getComputedStyle = _interopRequireDefault(require("./get-computed-style"));
/**
 * Internal dependencies
 */

/**
 * 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.
 */
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 ((0, _getComputedStyle.default)(/** @type {Element} */closestElement).position !== 'static') {
    return closestElement;
  }

  // offsetParent is undocumented/draft.
  return /** @type {Node & { offsetParent: Node }} */closestElement.offsetParent;
}
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