[EUI+] Implement Breadcrumbs design changes

packages/docusaurus-theme/src/theme/DocBreadcrumbs/Items/Home/index.tsx

@@ -0,0 +1,31 @@
+import React from 'react';
+import { css } from '@emotion/react';
+import Link from '@docusaurus/Link';
+import useBaseUrl from '@docusaurus/useBaseUrl';
+import { translate } from '@docusaurus/Translate';
+import { EuiIcon, useEuiMemoizedStyles } from '@elastic/eui';
+
+import { getItemStyles } from '../item.styles';
+
+export default function HomeBreadcrumbItem(): JSX.Element {
+  const homeHref = useBaseUrl('/');
+
+  const styles = useEuiMemoizedStyles(getItemStyles);
+
+  return (
+    <li className="breadcrumbs__item" css={styles.item}>
+      <Link
+        aria-label={translate({
+          id: 'theme.docs.breadcrumbs.home',
+          message: 'Home page',
+          description: 'The ARIA label for the home page in the breadcrumbs',
+        })}
+        className="breadcrumbs__link"
+        href={homeHref}
+      >
+        EUI+
+      </Link>
+      <EuiIcon type="arrowRight" size="s" css={styles.icon} />
+    </li>
+  );
+}

packages/docusaurus-theme/src/theme/DocBreadcrumbs/Items/item.styles.ts

@@ -0,0 +1,35 @@
+import { css } from '@emotion/react';
+import { UseEuiTheme } from '@elastic/eui';
+
+export const getItemStyles = ({ euiTheme }: UseEuiTheme) => ({
+  item: css`
+    --ifm-breadcrumb-item-background: transparent;
+    --ifm-breadcrumb-item-background-active: transparent;
+
+    // overwrite global styles
+    &.breadcrumbs__item:not(:last-child):after {
+      content: none;
+    }
+
+    .breadcrumbs__link {
+      padding: 0 ${euiTheme.size.m};
+      font-size: var(--eui-font-size-xs);
+      line-height: var(--eui-line-height-m);
+    }
+
+    a.breadcrumbs__link {
+      color: ${euiTheme.colors.link};
+      font-weight: ${euiTheme.font.weight.bold};
+      text-decoration: underline;
+    }
+
+    &.breadcrumbs__item--active .breadcrumbs__link {
+      color: ${euiTheme.colors.text};
+    }
+  `,
+  icon: css`
+    block-size: ${euiTheme.size.s};
+    inline-size: ${euiTheme.size.s};
+    fill: ${euiTheme.colors.text};
+  `,
+});

packages/docusaurus-theme/src/theme/DocBreadcrumbs/index.tsx

@@ -0,0 +1,138 @@
+import React, { type ReactNode } from 'react';
+import clsx from 'clsx';
+import { css } from '@emotion/react';
+import { ThemeClassNames } from '@docusaurus/theme-common';
+import {
+  useSidebarBreadcrumbs,
+  useHomePageRoute,
+} from '@docusaurus/theme-common/internal';
+import Link from '@docusaurus/Link';
+import { translate } from '@docusaurus/Translate';
+import { EuiIcon, useEuiMemoizedStyles, UseEuiTheme } from '@elastic/eui';
+
+import HomeBreadcrumbItem from './Items/Home';
+import { getItemStyles } from './Items/item.styles';
+
+// converted from css modules to Emotion
+const getStyles = ({ euiTheme }: UseEuiTheme) => ({
+  breadcrumbsContainer: css`
+    --ifm-breadcrumb-size-multiplier: 0.8;
+
+    // align breadcrumb items with content
+    margin-inline-start: -${euiTheme.size.m};
+  `,
+});
+
+// TODO move to design system folder
+function BreadcrumbsItemLink({
+  children,
+  href,
+  isLast,
+}: {
+  children: ReactNode;
+  href: string | undefined;
+  isLast: boolean;
+}): JSX.Element {
+  const className = 'breadcrumbs__link';
+  if (isLast) {
+    return (
+      <span className={className} itemProp="name">
+        {children}
+      </span>
+    );
+  }
+  return href ? (
+    <Link className={className} href={href} itemProp="item">
+      <span itemProp="name">{children}</span>
+    </Link>
+  ) : (
+    // TODO Google search console doesn't like breadcrumb items without href.
+    // The schema doesn't seem to require `id` for each `item`, although Google
+    // insist to infer one, even if it's invalid. Removing `itemProp="item
+    // name"` for now, since I don't know how to properly fix it.
+    // See https://github.com/facebook/docusaurus/issues/7241
+    <span className={className}>{children}</span>
+  );
+}
+
+function BreadcrumbsItem({
+  children,
+  active,
+  index,
+  addMicrodata,
+}: {
+  children: ReactNode;
+  active?: boolean;
+  index: number;
+  addMicrodata: boolean;
+}): JSX.Element {
+  const styles = useEuiMemoizedStyles(getItemStyles);
+
+  return (
+    <li
+      {...(addMicrodata && {
+        itemScope: true,
+        itemProp: 'itemListElement',
+        itemType: 'https://schema.org/ListItem',
+      })}
+      className={clsx('breadcrumbs__item', {
+        'breadcrumbs__item--active': active,
+      })}
+      css={styles.item}
+    >
+      {children}
+      <meta itemProp="position" content={String(index + 1)} />
+      {!active && <EuiIcon type="arrowRight" css={styles.icon} />}
+    </li>
+  );
+}
+
+export default function DocBreadcrumbs(): JSX.Element | null {
+  const breadcrumbs = useSidebarBreadcrumbs();
+  const homePageRoute = useHomePageRoute();
+
+  const styles = useEuiMemoizedStyles(getStyles);
+
+  if (!breadcrumbs) {
+    return null;
+  }
+
+  return (
+    <nav
+      className={clsx(ThemeClassNames.docs.docBreadcrumbs)}
+      aria-label={translate({
+        id: 'theme.docs.breadcrumbs.navAriaLabel',
+        message: 'Breadcrumbs',
+        description: 'The ARIA label for the breadcrumbs',
+      })}
+      css={styles.breadcrumbsContainer}
+    >
+      <ul
+        className="breadcrumbs"
+        itemScope
+        itemType="https://schema.org/BreadcrumbList"
+      >
+        {homePageRoute && <HomeBreadcrumbItem />}
+        {breadcrumbs.map((item, idx) => {
+          const isLast = idx === breadcrumbs.length - 1;
+          const href =
+            item.type === 'category' && item.linkUnlisted
+              ? undefined
+              : item.href;
+          return (
+            <BreadcrumbsItem
+              key={idx}
+              active={isLast}
+              index={idx}
+              addMicrodata={!!href}
+            >
+              <BreadcrumbsItemLink href={href} isLast={isLast}>
+                {item.label}
+              </BreadcrumbsItemLink>
+            </BreadcrumbsItem>
+          );
+        })}
+      </ul>
+    </nav>
+  );
+}

packages/docusaurus-theme/src/theme/DocItem/Layout/index.tsx

@@ -3,13 +3,13 @@ import { css } from '@emotion/react';
 import { useWindowSize } from '@docusaurus/theme-common';
 import { useDoc } from '@docusaurus/theme-common/internal';
 import DocItemPaginator from '@theme-original/DocItem/Paginator';
-import DocVersionBanner from '@theme-original/DocVersionBanner';
-import DocVersionBadge from '@theme-original/DocVersionBadge';
-import DocBreadcrumbs from '@theme-original/DocBreadcrumbs';
 import Unlisted from '@theme-original/Unlisted';
 import * as Props from '@theme-original/DocItem/Layout';
 import { EuiHorizontalRule } from '@elastic/eui';
 
+import DocVersionBanner from '../../DocVersionBanner';
+import DocVersionBadge from '../../DocVersionBadge';
+import DocBreadcrumbs from '../../DocBreadcrumbs';
 import DocItemContent from '../Content';
 import DocItemTOCMobile from '../TOC/Mobile';
 import DocItemTOCDesktop from '../TOC/Desktop';

packages/docusaurus-theme/src/theme/DocItem/index.tsx

@@ -1,9 +1,9 @@
 import React from 'react';
 import { HtmlClassNameProvider } from '@docusaurus/theme-common';
 import { DocProvider } from '@docusaurus/theme-common/internal';
-import DocItemMetadata from '@theme-original/DocItem/Metadata';
 import type { Props } from '@theme/DocItem';
 
+import DocItemMetadata from './Metadata';
 import DocItemLayout from './Layout';
 
 export default function DocItem(props: Props): JSX.Element {

packages/docusaurus-theme/src/theme/DocRoot/Layout/Main/index.tsx

@@ -0,0 +1,53 @@
+import React from 'react';
+import clsx from 'clsx';
+import { css } from '@emotion/react';
+import { useDocsSidebar } from '@docusaurus/theme-common/internal';
+import type { Props } from '@theme-original/DocRoot/Layout/Main';
+
+// converted from css modules to Emotion
+const styles = {
+  docMainContainer: css`
+    display: flex;
+    width: 100%;
+
+    @media (min-width: 997px) {
+      flex-grow: 1;
+      max-width: calc(100% - var(--doc-sidebar-width));
+    }
+  `,
+  docMainContainerEnhanced: css`
+    @media (min-width: 997px) {
+      max-width: calc(100% - var(--doc-sidebar-hidden-width));
+    }
+  `,
+  docItemWrapperEnhanced: css`
+    @media (min-width: 997px) {
+      max-width: calc(
+        var(--ifm-container-width) + var(--doc-sidebar-width)
+      ) !important;
+    }
+  `,
+};
+
+export default function DocRootLayoutMain({
+  hiddenSidebarContainer,
+  children,
+}: any): JSX.Element {
+  const sidebar = useDocsSidebar();
+  return (
+    <main
+      className={clsx(styles.docMainContainer)}
+      css={[
+        styles.docMainContainer,
+        (hiddenSidebarContainer || !sidebar) && styles.docMainContainerEnhanced,
+      ]}
+    >
+      <div
+        className="container padding-top--md padding-bottom--lg"
+        css={[hiddenSidebarContainer && styles.docItemWrapperEnhanced]}
+      >
+        {children}
+      </div>
+    </main>
+  );
+}

packages/docusaurus-theme/src/theme/DocRoot/Layout/Sidebar/ExpandButton/index.tsx

@@ -0,0 +1,60 @@
+import React from 'react';
+import { css } from '@emotion/react';
+import { translate } from '@docusaurus/Translate';
+import IconArrow from '@theme-original/Icon/Arrow';
+
+import type { Props } from '@theme-original/DocRoot/Layout/Sidebar/ExpandButton';
+
+// converted from css modules to Emotion
+const styles = {
+  expandButton: css`
+    @media (min-width: 997px) {
+      position: absolute;
+      top: 0;
+      right: 0;
+      width: 100%;
+      height: 100%;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      transition: background-color var(--ifm-transition-fast) ease;
+      background-color: var(--docusaurus-collapse-button-bg);
+
+      &:hover,
+      &:focus {
+        background-color: var(--docusaurus-collapse-button-bg-hover);
+      }
+    }
+  `,
+  expandButtonIcon: css`
+    transform: rotate(0);
+  `,
+};
+
+export default function DocRootLayoutSidebarExpandButton({
+  toggleSidebar,
+}: Props): JSX.Element {
+  return (
+    <div
+      css={styles.expandButton}
+      title={translate({
+        id: 'theme.docs.sidebar.expandButtonTitle',
+        message: 'Expand sidebar',
+        description:
+          'The ARIA label and title attribute for expand button of doc sidebar',
+      })}
+      aria-label={translate({
+        id: 'theme.docs.sidebar.expandButtonAriaLabel',
+        message: 'Expand sidebar',
+        description:
+          'The ARIA label and title attribute for expand button of doc sidebar',
+      })}
+      tabIndex={0}
+      role="button"
+      onKeyDown={toggleSidebar}
+      onClick={toggleSidebar}
+    >
+      <IconArrow css={styles.expandButtonIcon} />
+    </div>
+  );
+}