pleroma/app/soapbox/features/compose/editor/utils/get-dom-range-rect.ts

/**
 * This source code is derived from code from Meta Platforms, Inc.
 * and affiliates, licensed under the MIT license located in the
 * LICENSE file in the /app/soapbox/features/compose/editor directory.
 */

/* eslint-disable eqeqeq */

export const getDOMRangeRect = (
  nativeSelection: Selection,
  rootElement: HTMLElement,
): DOMRect => {
  const domRange = nativeSelection.getRangeAt(0);

  let rect;

  if (nativeSelection.anchorNode === rootElement) {
    let inner = rootElement;
    while (inner.firstElementChild != null) {
      inner = inner.firstElementChild as HTMLElement;
    }
    rect = inner.getBoundingClientRect();
  } else {
    rect = domRange.getBoundingClientRect();
  }

  return rect;
};