umami/components/common/LanguageButton.js

import React, { useState, useRef } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import Globe from 'assets/globe.svg';
import useDocumentClick from 'hooks/useDocumentClick';
import { updateApp } from 'redux/actions/app';
import Menu from './Menu';
import styles from './LanguageButton.module.css';
import Button from './Button';

const menuOptions = [
  { label: 'English', value: 'en' },
  { label: '中文 (Chinese)', value: 'zh-CN' },
];

export default function LanguageButton() {
  const dispatch = useDispatch();
  const [showMenu, setShowMenu] = useState(false);
  const locale = useSelector(state => state.app.locale);
  const ref = useRef();
  const selectedLocale = menuOptions.find(e => e.value === locale)?.label.split(' ')[0];

  function handleSelect(value) {
    dispatch(updateApp({ locale: value }));
    window.localStorage.setItem('locale', value);
    setShowMenu(false);
  }

  useDocumentClick(e => {
    if (!ref.current.contains(e.target)) {
      setShowMenu(false);
    }
  });

  return (
    <div ref={ref} className={styles.container}>
      <Button icon={<Globe />} onClick={() => setShowMenu(true)} size="small">
        <div>{selectedLocale}</div>
      </Button>
      {showMenu && <Menu options={menuOptions} onSelect={handleSelect} float="top" />}
    </div>
  );
}