site-header.tsx

export interface DesktopLinks {
  label: string;
  url: string;
  menuLinkId: string;
}
export interface DonateLink {
  url: string;
  label: string;
}
export interface ComponentLabels {
  open: string;
  close: string;
  expand?: string;
  label?: string;
}

import {Component, Element, h, Listen, Prop, State} from '@stencil/core';
import ResizeObserver from 'resize-observer-polyfill';
import {MenuType, ColorVariant, SiteLogoSize} from '../../utils/utils';

@Component({
  tag: 'hy-site-header',
  styleUrl: 'site-header.scss',
  shadow: true,
})
export class SiteHeader {
  @Element() el: HTMLElement;
  @Prop() dataMenuLanguage: string;
  @Prop() dataMenuDonate: string;
  @Prop() dataSiteHeaderLabels: string;
  @Prop() logoUrl?: string;
  @Prop() logoLabel?: string;
  @Prop() menuLabel: string = 'Menu';
  @Prop() menuLabelOpen?: string;
  @Prop() menuLabelClose?: string;
  @Prop({reflect: true}) menuType: MenuType = MenuType.default;
  /*
  First level menu links to be displayed on Desktop screens.
  * */
  @Prop() dataDesktopLinks: DesktopLinks[] | string;
  @State() isMobile: boolean;
  @State() isMenuOpen: boolean = false;
  @State() isDesktopMenuOpen: boolean = false;
  private ro: ResizeObserver;
  private donateLink: DonateLink[];
  private menuLabels: ComponentLabels[];
  private searchLabels: ComponentLabels[];
  private languageLabels: ComponentLabels[];

  @State() lastScrollTop = 0;
  @State() delta = 5;
  @State() navbarHeight = 0;
  @State() didScroll = false;
  @State() intervalId;

  // Listener for toggling mobile menu panel on or off.
  @Listen('mobileMenuToggle') mobileMenuToggle() {
    this.isMenuOpen = !this.isMenuOpen;
  }

  @Listen('scroll', {target: 'window'})
  handleScroll() {
    if (this.el.getAttribute('menu-type') === 'desktop') {
      this.didScroll = true;
    }
  }

  componentDidLoad() {
    // Set the browser resize observer to gather information about browser width.
    this.ro = new ResizeObserver((entries) => {
      for (const entry of entries) {
        this.applySizeClasses(entry.contentRect.width);
      }
    });
    this.ro.observe(document.body);

    // Pass the dataMenuLanguage prop to menu component.
    this.el.children[0].setAttribute('data-menu-language', this.dataMenuLanguage);

    this.navbarHeight = this.el.getClientRects()[0].height;
  }

  componentWillLoad() {
    // Check for site header labels and set them to variables accordingly.
    if (this.dataSiteHeaderLabels) {
      const labels = JSON.parse(this.dataSiteHeaderLabels);
      this.menuLabels = labels.menu_labels;
      this.languageLabels = labels.language_labels;
      this.searchLabels = labels.search_labels;
    }

    // Check for the donation link information and set it to variables accordingly.
    // Also pass the donation link data to menu-component.
    if (this.dataMenuDonate) {
      this.donateLink = JSON.parse(this.dataMenuDonate);
      this.el.children[0].setAttribute('data-menu-donate', this.dataMenuDonate);
    }
  }

  componentWillUpdate() {
    // Pass the necessary information to menu component. These props will be
    // used in mobile menu.
    this.el.children[0].setAttribute('open', this.isMenuOpen.toString());
    this.el.children[0].setAttribute('logo-label', this.logoLabel);
    this.el.children[0].setAttribute('logo-url', this.logoUrl);
    this.el.children[0].setAttribute('menu-button-submenu-expand', this.menuLabels['expand']);
    this.el.children[0].setAttribute('menu-button-breadcrumb-return', this.menuLabels['return']);
    this.el.children[0].setAttribute('menu-language-label-open', this.languageLabels['open']);
    this.el.children[0].setAttribute('menu-language-label-close', this.languageLabels['close']);
    this.el.children[0].setAttribute('label-front-page', this.menuLabels['front_page']);

    this.intervalId = setInterval(() => {
      this.timer();
    }, 250);
  }

  timer() {
    if (this.didScroll) {
      this.hasScrolled();
      this.didScroll = false;
    }
  }

  hasScrolled() {
    let st = window.pageYOffset;
    if (Math.abs(this.lastScrollTop - st) <= this.delta) {
      return;
    }

    let hySiteHeader = this.el.shadowRoot.querySelector('.hy-site-header') as HTMLElement;
    // If current position > last position AND scrolled past navbar...
    if (st > this.lastScrollTop && st > this.navbarHeight) {
      // Scroll Down

      hySiteHeader.classList.add('hy-site-header--sticky-active');
      hySiteHeader.classList.add('hy-site-header--sticky-hidden');
      hySiteHeader.classList.remove('hy-site-header--sticky-visible');
    } else {
      // Scroll Up
      if (st < this.el.offsetTop + this.navbarHeight) {
        hySiteHeader.classList.remove('hy-site-header--sticky-active');
        hySiteHeader.classList.remove('hy-site-header--sticky-visible');
        hySiteHeader.classList.remove('hy-site-header--sticky-hidden');
      } else {
        hySiteHeader.classList.add('hy-site-header--sticky-active');
        hySiteHeader.classList.add('hy-site-header--sticky-visible');
        hySiteHeader.classList.remove('hy-site-header--sticky-hidden');
      }
    }
    this.lastScrollTop = st;
  }

  componentDidUnload() {
    this.ro.disconnect();
  }

  applySizeClasses(size: number) {
    // Set the menu-type based on the width of the browser.
    if (size <= 1200 && size > 960) {
      this.menuType = MenuType.tablet;
    } else if (size <= 960) {
      this.menuType = MenuType.mobile;
    } else {
      this.menuType = MenuType.desktop;
    }

    // Pass the menu type to menu component.
    this.isMobile = this.menuType === (MenuType.mobile || MenuType.tablet);
    const menuAttribute = this.menuType === MenuType.tablet ? MenuType.mobile : this.menuType;
    this.el.children[0].setAttribute('menu-type', menuAttribute);
  }

  render() {
    const logoSize = this.isMobile ? SiteLogoSize.small : SiteLogoSize.big;
    const logoColor = ColorVariant.black;
    let classAttributes = ['hy-site-header', 'hy-site-header--' + this.menuType];

    switch (this.menuType) {
      case MenuType.desktop:
        return [
          <header class={classAttributes.join(' ')}>
            <div class={{'hy-backdrop': true, 'is-active': this.isMenuOpen}} />
            <div class={'hy-site-header__logo-container'}>
              <hy-site-logo size={logoSize} color={logoColor} url={this.logoUrl} label={this.logoLabel} />
            </div>

            <hy-desktop-menu-links data-desktop-links={this.dataDesktopLinks}></hy-desktop-menu-links>

            <div class={'menu--secondary'}>
              <hy-menu-language
                class={'menu--secondary__item is-first'}
                is-mobile={false}
                data-menu-language={this.dataMenuLanguage}
                labels={this.languageLabels}
              />
              <hy-site-search
                class={'menu--secondary__item'}
                size={14}
                color={ColorVariant.black}
                show-label={true}
                labels={this.searchLabels}
              />
              {this.donateLink.map((i) => {
                return (
                  <a class={'menu--secondary__item hy-link__donate'} href={i.url}>
                    <hy-icon icon={'hy-icon-euro'} size={14} fill={ColorVariant.black} />
                    <span class={'hy-link__donate__label'}>{i.label}</span>
                  </a>
                );
              })}
            </div>
          </header>,
        ];
      case MenuType.tablet:
        return (
          <header class={classAttributes.join(' ')}>
            <div class={{'hy-backdrop': true, 'is-active': this.isMenuOpen}} />
            <div class={'hy-site-header__logo-container'}>
              <hy-site-logo size={logoSize} color={logoColor} url={this.logoUrl} label={this.logoLabel} />
            </div>
            <div class={'menu--secondary'}>
              <hy-menu-language
                class={'menu--secondary__item is-first'}
                is-mobile={false}
                data-menu-language={this.dataMenuLanguage}
                labels={this.languageLabels}
              />
              <hy-site-search
                class={'menu--secondary__item'}
                size={14}
                color={ColorVariant.black}
                show-label={true}
                labels={this.searchLabels}
              />
              {this.donateLink.map((i) => {
                return (
                  <a class={'menu--secondary__item hy-link__donate'} href={i.url}>
                    <hy-icon icon={'hy-icon-euro'} size={14} fill={ColorVariant.black} />
                    <span class={'hy-link__donate__label'}>{i.label}</span>
                  </a>
                );
              })}
            </div>
            <div class={'hy-site-header__menu-container'}>
              <span
                class={{
                  'hy-site-header__menu-label': true,
                  'is-visible': this.isMenuOpen,
                }}
              >
                {this.menuLabel}
              </span>
              <button
                onClick={() => this.mobileMenuToggle()}
                class={{
                  'hy-site-header__panel-toggle': true,
                  'is-open': this.isMenuOpen,
                }}
                aria-label={this.isMenuOpen ? this.menuLabels['close'] : this.menuLabels['open']}
              >
                {this.isMenuOpen ? (
                  <span class="hy-site-header__panel-toggle__label">
                    {this.menuLabelClose}
                    <hy-icon icon={'hy-icon-remove'} size={20} fill={ColorVariant.black} />
                  </span>
                ) : (
                  <span class="hy-site-header__panel-toggle__label">
                    {this.menuLabelOpen}
                    <hy-icon icon={'hy-icon-hamburger'} size={20} fill={ColorVariant.black} />
                  </span>
                )}
              </button>
              <div
                class={{
                  'is-open': this.isMenuOpen,
                  'hy-site-header__panel': true,
                }}
              >
                <slot name={'menu'} />
              </div>
            </div>
          </header>
        );
      case MenuType.mobile:
        return (
          <header class={classAttributes.join(' ')}>
            <div class={{'hy-backdrop': true, 'is-active': this.isMenuOpen}} />
            <div class={'hy-site-header__logo-container'}>
              <hy-site-logo size={logoSize} color={logoColor} url={this.logoUrl} label={this.logoLabel} />
            </div>
            <div class={'hy-site-header__menu-container'}>
              <hy-site-search
                class={'menu--secondary__item'}
                size={14}
                color={ColorVariant.black}
                show-label={true}
                labels={this.searchLabels}
              />
              <button
                onClick={() => this.mobileMenuToggle()}
                class={{
                  'hy-site-header__panel-toggle': true,
                  'is-open': this.isMenuOpen,
                }}
                aria-label={this.isMenuOpen ? this.menuLabels['close'] : this.menuLabels['open']}
              >
                {this.isMenuOpen ? (
                  <span class="hy-site-header__panel-toggle__label">
                    {this.menuLabelClose}
                    <hy-icon icon={'hy-icon-remove'} size={20} fill={ColorVariant.black} />
                  </span>
                ) : (
                  <span class="hy-site-header__panel-toggle__label">
                    {this.menuLabelOpen}
                    <hy-icon icon={'hy-icon-hamburger'} size={20} fill={ColorVariant.black} />
                  </span>
                )}
              </button>
              <div
                class={{
                  'is-open': this.isMenuOpen,
                  'hy-site-header__panel': true,
                }}
              >
                <slot name={'menu'} />
              </div>
            </div>
          </header>
        );
    }
  }
}