@atlaskit/modal-dialog/dist/esm/internal/hooks/use-prevent-programmatic-scroll.js

A modal dialog displays content that requires user interaction, in a layer above the page.

import _slicedToArray from "@babel/runtime/helpers/slicedToArray";
import { useCallback, useEffect, useLayoutEffect, useState } from 'react';
import { bind } from 'bind-event-listener';

/**
 * Returns how far the body is scrolled from the top of the viewport.
 *
 *   ____
 * ||____|| <-- overflow
 *  |    |  <-- viewport
 *  |____|
 *
 * Scroll distance is the height of overflow outside the viewport.
 */
function getScrollDistance() {
  var _document$documentEle, _document$body;
  return window.pageYOffset || ((_document$documentEle = document.documentElement) === null || _document$documentEle === void 0 ? void 0 : _document$documentEle.scrollTop) || ((_document$body = document.body) === null || _document$body === void 0 ? void 0 : _document$body.scrollTop) || 0;
}

/**
 * Prevents programatic scrolling of the viewport with `scrollIntoView`.
 * Should be used in conjunction with a scroll lock to prevent a user from scrolling.
 *
 * @returns scroll top offset of the viewport
 */
export default function usePreventProgrammaticScroll() {
  var _useState = useState(0),
    _useState2 = _slicedToArray(_useState, 2),
    scrollTopOffset = _useState2[0],
    setScrollTopOffset = _useState2[1];
  useLayoutEffect(function () {
    setScrollTopOffset(getScrollDistance());
  }, []);
  var onWindowScroll = useCallback(function () {
    if (getScrollDistance() !== scrollTopOffset) {
      window.scrollTo(window.pageXOffset, scrollTopOffset);
    }
  }, [scrollTopOffset]);
  useEffect(function () {
    return bind(window, {
      type: 'scroll',
      listener: onWindowScroll
    });
  }, [onWindowScroll]);
  return scrollTopOffset;
}