[Getting Started] Added “Add data” button to Global Nav Drawer (#113648) (#113875)

* Adding EUI as code-owners to KibanaPageTemplate
# Conflicts:
#	.github/CODEOWNERS

src/core/public/chrome/ui/header/__snapshots__/collapsible_nav.test.tsx.snap

@@ -565,6 +565,7 @@ exports[`CollapsibleNav renders links grouped by category 1`] = `
                           "data-test-subj": "homeLink",
                           "href": "/",
                           "iconType": "home",
+                          "isActive": false,
                           "label": "Home",
                           "onClick": [Function],
                         },
@@ -587,6 +588,7 @@ exports[`CollapsibleNav renders links grouped by category 1`] = `
                         data-test-subj="homeLink"
                         href="/"
                         iconType="home"
+                        isActive={false}
                         key="title-0"
                         label="Home"
                         onClick={[Function]}

src/core/public/chrome/ui/header/collapsible_nav.tsx

@@ -16,10 +16,11 @@ import {
   EuiListGroupItem,
   EuiShowFor,
   EuiCollapsibleNavProps,
+  EuiButton,
 } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
 import { groupBy, sortBy } from 'lodash';
-import React, { Fragment, useRef } from 'react';
+import React, { Fragment, useMemo, useRef } from 'react';
 import useObservable from 'react-use/lib/useObservable';
 import * as Rx from 'rxjs';
 import { ChromeNavLink, ChromeRecentlyAccessedHistoryItem } from '../..';
@@ -27,8 +28,12 @@ import { AppCategory } from '../../../../types';
 import { InternalApplicationStart } from '../../../application/types';
 import { HttpStart } from '../../../http';
 import { OnIsLockedUpdate } from './';
-import { createEuiListItem, createRecentNavLink, isModifiedOrPrevented } from './nav_link';
-
+import {
+  createEuiListItem,
+  createRecentNavLink,
+  isModifiedOrPrevented,
+  createEuiButtonItem,
+} from './nav_link';
 function getAllCategories(allCategorizedLinks: Record<string, ChromeNavLink[]>) {
   const allCategories = {} as Record<string, AppCategory | undefined>;
 
@@ -95,12 +100,28 @@ export function CollapsibleNav({
   button,
   ...observables
 }: Props) {
-  const navLinks = useObservable(observables.navLinks$, []).filter((link) => !link.hidden);
+  const allLinks = useObservable(observables.navLinks$, []);
+  const allowedLinks = useMemo(
+    () =>
+      allLinks.filter(
+        // Filterting out hidden links and the integrations one in favor of a specific Add Data button at the bottom
+        (link) => !link.hidden && link.id !== 'integrations'
+      ),
+    [allLinks]
+  );
+  const integrationsLink = useMemo(
+    () =>
+      allLinks.find(
+        // Find just the integrations link
+        (link) => link.id === 'integrations'
+      ),
+    [allLinks]
+  );
   const recentlyAccessed = useObservable(observables.recentlyAccessed$, []);
   const customNavLink = useObservable(observables.customNavLink$, undefined);
   const appId = useObservable(observables.appId$, '');
   const lockRef = useRef<HTMLButtonElement>(null);
-  const groupedNavLinks = groupBy(navLinks, (link) => link?.category?.id);
+  const groupedNavLinks = groupBy(allowedLinks, (link) => link?.category?.id);
   const { undefined: unknowns = [], ...allCategorizedLinks } = groupedNavLinks;
   const categoryDictionary = getAllCategories(allCategorizedLinks);
   const orderedCategories = getOrderedCategories(allCategorizedLinks, categoryDictionary);
@@ -176,6 +197,7 @@ export function CollapsibleNav({
                 iconType: 'home',
                 href: homeHref,
                 'data-test-subj': 'homeLink',
+                isActive: appId === 'home',
                 onClick: (event) => {
                   if (isModifiedOrPrevented(event)) {
                     return;
@@ -217,7 +239,7 @@ export function CollapsibleNav({
               // Can remove icon from recent links completely
               const { iconType, onClick, ...hydratedLink } = createRecentNavLink(
                 link,
-                navLinks,
+                allowedLinks,
                 basePath,
                 navigateToUrl
               );
@@ -323,6 +345,29 @@ export function CollapsibleNav({
           </EuiCollapsibleNavGroup>
         </EuiShowFor>
       </EuiFlexItem>
+      {integrationsLink && (
+        <EuiFlexItem grow={false}>
+          {/* Span fakes the nav group into not being the first item and therefore adding a top border */}
+          <span />
+          <EuiCollapsibleNavGroup>
+            <EuiButton
+              {...createEuiButtonItem({
+                link: integrationsLink,
+                navigateToUrl,
+                onClick: closeNav,
+                dataTestSubj: `collapsibleNavAppButton-${integrationsLink.id}`,
+              })}
+              fill
+              fullWidth
+              iconType="plusInCircleFilled"
+            >
+              {i18n.translate('core.ui.primaryNav.addData', {
+                defaultMessage: 'Add data',
+              })}
+            </EuiButton>
+          </EuiCollapsibleNavGroup>
+        </EuiFlexItem>
+      )}
     </EuiCollapsibleNav>
   );
 }

src/core/public/chrome/ui/header/nav_link.tsx

@@ -14,7 +14,7 @@ import { HttpStart } from '../../../http';
 import { InternalApplicationStart } from '../../../application/types';
 import { relativeToAbsolute } from '../../nav_links/to_nav_link';
 
-export const isModifiedOrPrevented = (event: React.MouseEvent<HTMLButtonElement, MouseEvent>) =>
+export const isModifiedOrPrevented = (event: React.MouseEvent<HTMLElement, MouseEvent>) =>
   event.metaKey || event.altKey || event.ctrlKey || event.shiftKey || event.defaultPrevented;
 
 interface Props {
@@ -71,6 +71,29 @@ export function createEuiListItem({
   };
 }
 
+export function createEuiButtonItem({
+  link,
+  onClick = () => {},
+  navigateToUrl,
+  dataTestSubj,
+}: Omit<Props, 'appId' | 'basePath'>) {
+  const { href, disabled, url } = link;
+
+  return {
+    href,
+    /* Use href and onClick to support "open in new tab" and SPA navigation in the same link */
+    onClick(event: React.MouseEvent<HTMLAnchorElement, MouseEvent>) {
+      if (!isModifiedOrPrevented(event)) {
+        onClick();
+      }
+      event.preventDefault();
+      navigateToUrl(url);
+    },
+    isDisabled: disabled,
+    'data-test-subj': dataTestSubj,
+  };
+}
+
 export interface RecentNavLink {
   href: string;
   label: string;