signal-desktop/ts/components/ShortcutGuideModal.tsx

// Copyright 2019-2020 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import * as React from 'react';
import { createPortal } from 'react-dom';
import type { LocalizerType } from '../types/Util';
import { ShortcutGuide } from './ShortcutGuide';

export type PropsType = {
  hasInstalledStickers: boolean;
  platform: string;
  readonly close: () => unknown;
  readonly i18n: LocalizerType;
};

export const ShortcutGuideModal = React.memo((props: PropsType) => {
  const { i18n, close, hasInstalledStickers, platform } = props;
  const [root, setRoot] = React.useState<HTMLElement | null>(null);

  React.useEffect(() => {
    const div = document.createElement('div');
    document.body.appendChild(div);
    setRoot(div);

    return () => {
      document.body.removeChild(div);
    };
  }, []);

  return root
    ? createPortal(
        <div className="module-shortcut-guide-modal">
          <div className="module-shortcut-guide-container">
            <ShortcutGuide
              hasInstalledStickers={hasInstalledStickers}
              platform={platform}
              close={close}
              i18n={i18n}
            />
          </div>
        </div>,
        root
      )
    : null;
});