devthread.ru/src/components/Header/Header.js

import React from "react"
import { useLocation } from "@reach/router"
import PropTypes from "prop-types"
import { Link } from "gatsby"
import useSiteMetadataQuery from "../../hooks/useSiteMetadataQuery"
import ThemeSwitcher from "./ThemeSwitcher/ThemeSwitcher"

import LogoIcon from "../../images/logo-icon.svg"
import TelegramIcon from "../../images/telegram-icon.svg"
import TwitterIcon from "../../images/twitter-icon.svg"

const Header = () => {
  const {
    siteMetadata: {
      title,
      menuLinks,
      social: { twitter, telegram },
    },
  } = useSiteMetadataQuery()
  const [isScrolled, setIsScrolled] = React.useState(false)
  const [isMobileOpen, setIsMobileOpen] = React.useState(false)
  const { pathname } = useLocation()

  React.useEffect(() => {
    isMobileOpen
      ? (document.body.style.overflowY = "hidden")
      : (document.body.style.overflowY = "")
    document.body.onscroll = () =>
      window.pageYOffset >= 100 ? setIsScrolled(true) : setIsScrolled(false)
  }, [isMobileOpen])

  const mobileHandler = () => {
    setIsMobileOpen(!isMobileOpen)
  }

  const renderLinks = () => {
    return (
      <ul>
        {menuLinks.map((page, i) => (
          <li
            key={i}
            className={
              page.link === pathname || pathname === `${page.link}/`
                ? "active"
                : null
            }
          >
            <Link to={page.link}>{page.name}</Link>
          </li>
        ))}
      </ul>
    )
  }

  return (
    <header className={isScrolled ? "headerScrolled" : null}>
      <div className="header-content">
        <div className="header-content__logo">
          <LogoIcon />
          <Link to="/">{title}</Link>
        </div>
        <div className="header-content__nav desktop">
          <div className="header-nav__social">
            <a href={telegram} target="_blank" rel="noreferrer">
              <TelegramIcon />
            </a>
            <a href={twitter} target="_blank" rel="noreferrer">
              <TwitterIcon />
            </a>
          </div>
          <div className="header-nav__links">
            <nav>{renderLinks()}</nav>
          </div>
          <ThemeSwitcher />
        </div>
        <div
          className={
            isMobileOpen
              ? "header-content__nav mobile mobileOpen"
              : "header-content__nav mobile"
          }
        >
          {isMobileOpen ? (
            <>
              <span>{title}</span>
              <nav>{renderLinks()}</nav>
              <div className="mobile-social">
                <a href="/" target="_blank">
                  <TelegramIcon />
                </a>
                <a href="/" target="_blank">
                  <TwitterIcon />
                </a>
              </div>
            </>
          ) : null}
        </div>
        <button
          aria-label="menu"
          onClick={mobileHandler}
          className={
            isMobileOpen
              ? "header-content__button mobile active"
              : "header-content__button mobile"
          }
        >
          <span />
          <span />
          <span />
        </button>
      </div>
    </header>
  )
}

export default Header

Header.propTypes = {
  title: PropTypes.string,
  menuLinks: PropTypes.arrayOf(
    PropTypes.shape({
      link: PropTypes.string,
      name: PropTypes.string,
    })
  ),
}

Header.defaultProps = {
  title: null,
  menuLinks: null,
}