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path: root/packages/renderer/src/components/BrowserViewPlaceholder.tsx
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/*
 * Copyright (C)  2021-2022 Kristóf Marussy <kristof@marussy.com>
 *
 * This file is part of Sophie.
 *
 * Sophie is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * SPDX-License-Identifier: AGPL-3.0-only
 */

import Box from '@mui/material/Box';
import throttle from 'lodash-es/throttle';
import { observer } from 'mobx-react-lite';
import React, { useCallback, useRef } from 'react';

import { useStore } from './StoreProvider';

export default observer(() => {
  const store = useStore();

  // eslint-disable-next-line react-hooks/exhaustive-deps -- react-hooks doesn't support `throttle`.
  const onResize = useCallback(
    throttle(([entry]: ResizeObserverEntry[]) => {
      if (entry) {
        const { x, y, width, height } = entry.target.getBoundingClientRect();
        store.setBrowserViewBounds({
          x,
          y,
          width,
          height,
        });
      }
    }, 100),
    [store],
  );

  const resizeObserverRef = useRef<ResizeObserver | null>(null);

  const ref = useCallback(
    (element: HTMLElement | null) => {
      if (resizeObserverRef.current !== null) {
        resizeObserverRef.current.disconnect();
      }
      if (element === null) {
        resizeObserverRef.current = null;
        return;
      }
      resizeObserverRef.current = new ResizeObserver(onResize);
      resizeObserverRef.current.observe(element);
    },
    [onResize, resizeObserverRef],
  );

  return (
    <Box
      sx={{
        flex: 1,
      }}
      ref={ref}
    />
  );
});