cinny/src/app/features/room/message/EncryptedContent.tsx

import { MatrixEvent, MatrixEventEvent, MatrixEventHandlerMap } from 'matrix-js-sdk';
import React, { ReactNode, useEffect, useState } from 'react';
import { MessageEvent } from '../../../../types/matrix/room';

type EncryptedContentProps = {
  mEvent: MatrixEvent;
  children: () => ReactNode;
};

export function EncryptedContent({ mEvent, children }: EncryptedContentProps) {
  const [, toggleEncrypted] = useState(mEvent.getType() === MessageEvent.RoomMessageEncrypted);

  useEffect(() => {
    toggleEncrypted(mEvent.getType() === MessageEvent.RoomMessageEncrypted);
    const handleDecrypted: MatrixEventHandlerMap[MatrixEventEvent.Decrypted] = (event) => {
      toggleEncrypted(event.getType() === MessageEvent.RoomMessageEncrypted);
    };
    mEvent.on(MatrixEventEvent.Decrypted, handleDecrypted);
    return () => {
      mEvent.removeListener(MatrixEventEvent.Decrypted, handleDecrypted);
    };
  }, [mEvent]);

  return <>{children()}</>;
}