[Discover] Adds an Options menu for switching between the two table modes

src/plugins/discover/public/application/components/discover_topnav.test.tsx

@@ -33,6 +33,9 @@ function getProps(): DiscoverTopNavProps {
       discover: {
         save: true,
       },
+      advancedSettings: {
+        save: true,
+      },
     },
     uiSettings: mockUiSettings,
   } as unknown) as DiscoverServices;

src/plugins/discover/public/application/components/top_nav/get_top_nav_links.test.ts

@@ -18,6 +18,9 @@ const services = ({
     discover: {
       save: true,
     },
+    advancedSettings: {
+      save: true,
+    },
   },
 } as unknown) as DiscoverServices;
 
@@ -36,6 +39,13 @@ test('getTopNavLinks result', () => {
   });
   expect(topNavLinks).toMatchInlineSnapshot(`
     Array [
+      Object {
+        "description": "Options",
+        "id": "options",
+        "label": "Options",
+        "run": [Function],
+        "testId": "discoverOptionsButton",
+      },
       Object {
         "description": "New Search",
         "id": "new",

src/plugins/discover/public/application/components/top_nav/get_top_nav_links.ts

@@ -15,6 +15,7 @@ import { SavedSearch } from '../../../saved_searches';
 import { onSaveSearch } from './on_save_search';
 import { GetStateReturn } from '../../angular/discover_state';
 import { IndexPattern, ISearchSource } from '../../../kibana_services';
+import { openOptionsPopover } from './open_options_popover';
 
 /**
  * Helper function to build the top nav links
@@ -38,6 +39,22 @@ export const getTopNavLinks = ({
   onOpenInspector: () => void;
   searchSource: ISearchSource;
 }) => {
+  const options = {
+    id: 'options',
+    label: i18n.translate('discover.localMenu.localMenu.optionsTitle', {
+      defaultMessage: 'Options',
+    }),
+    description: i18n.translate('discover.localMenu.optionsDescription', {
+      defaultMessage: 'Options',
+    }),
+    run: (anchorElement: HTMLElement) =>
+      openOptionsPopover({
+        I18nContext: services.core.i18n.Context,
+        anchorElement,
+      }),
+    testId: 'discoverOptionsButton',
+  };
+
   const newSearch = {
     id: 'new',
     label: i18n.translate('discover.localMenu.localMenu.newSearchTitle', {
@@ -128,6 +145,7 @@ export const getTopNavLinks = ({
   };
 
   return [
+    ...(services.capabilities.advancedSettings.save ? [options] : []),
     newSearch,
     ...(services.capabilities.discover.save ? [saveSearch] : []),
     openSearch,

src/plugins/discover/public/application/components/top_nav/open_options_popover.scss

@@ -0,0 +1,5 @@
+$dscOptionsPopoverWidth: $euiSizeL * 12;
+
+.dscOptionsPopover {
+  width: $dscOptionsPopoverWidth;
+}

src/plugins/discover/public/application/components/top_nav/open_options_popover.test.tsx

@@ -0,0 +1,50 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import React from 'react';
+import { shallow } from 'enzyme';
+import { EuiLink } from '@elastic/eui';
+import { getServices } from '../../../kibana_services';
+
+jest.mock('../../../kibana_services', () => {
+  const mockUiSettings = new Map();
+  return {
+    getServices: () => ({
+      core: {
+        uiSettings: {
+          get: (key: string) => {
+            return mockUiSettings.get(key);
+          },
+          set: (key: string, value: boolean) => {
+            mockUiSettings.set(key, value);
+          },
+        },
+      },
+      addBasePath: (path: string) => path,
+    }),
+  };
+});
+
+import { OptionsPopover } from './open_options_popover';
+
+test('should contain a link with the correct text if datagrid is selected', () => {
+  const element = document.createElement('div');
+  const component = shallow(<OptionsPopover onClose={jest.fn()} anchorElement={element} />);
+  expect(component.find(EuiLink).length).toBe(1);
+  expect(component.find(EuiLink).text()).toBe('Switch to legacy table');
+});
+
+test('should contain a link with the correct text if legacy table is selected', () => {
+  const {
+    core: { uiSettings },
+  } = getServices();
+  uiSettings.set('doc_table:legacy', true);
+  const element = document.createElement('div');
+  const component = shallow(<OptionsPopover onClose={jest.fn()} anchorElement={element} />);
+  expect(component.find(EuiLink).text()).toBe('Switch to data grid');
+});

src/plugins/discover/public/application/components/top_nav/open_options_popover.tsx

@@ -0,0 +1,86 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { I18nStart } from 'kibana/public';
+import { i18n } from '@kbn/i18n';
+import { FormattedMessage } from '@kbn/i18n/react';
+import { EuiSpacer, EuiLink, EuiText, EuiWrappingPopover } from '@elastic/eui';
+import { getServices } from '../../../kibana_services';
+import './open_options_popover.scss';
+
+let isOpen = false;
+
+interface OptionsPopoverProps {
+  onClose: () => void;
+  anchorElement: HTMLElement;
+}
+
+export function OptionsPopover(props: OptionsPopoverProps) {
+  const {
+    core: { uiSettings },
+    addBasePath,
+  } = getServices();
+  const isLegacy = uiSettings.get('doc_table:legacy');
+
+  const linkText = isLegacy
+    ? i18n.translate('discover.openOptionsPopover.switchToDataGridText', {
+        defaultMessage: 'Switch to data grid',
+      })
+    : i18n.translate('discover.openOptionsPopover.switchToLegacyText', {
+        defaultMessage: 'Switch to legacy table',
+      });
+
+  return (
+    <EuiWrappingPopover ownFocus button={props.anchorElement} closePopover={props.onClose} isOpen>
+      <div className="dscOptionsPopover">
+        <EuiLink href={addBasePath('/app/management/kibana/settings?query=Use legacy table')}>
+          {linkText}
+        </EuiLink>
+        <EuiSpacer size="s" />
+        <EuiText color="subdued" size="s">
+          <FormattedMessage
+            id="discover.topNav.openOptionsPopover.description"
+            defaultMessage="The new data grid layout includes better data sorting, drag-and-drop columns, and a full
+                screen view. Enable this option if you prefer to fall back to the legacy table."
+          />
+        </EuiText>
+      </div>
+    </EuiWrappingPopover>
+  );
+}
+
+export function openOptionsPopover({
+  I18nContext,
+  anchorElement,
+}: {
+  I18nContext: I18nStart['Context'];
+  anchorElement: HTMLElement;
+}) {
+  if (isOpen) {
+    return;
+  }
+
+  isOpen = true;
+  const container = document.createElement('div');
+  const onClose = () => {
+    ReactDOM.unmountComponentAtNode(container);
+    document.body.removeChild(container);
+    isOpen = false;
+  };
+
+  document.body.appendChild(container);
+
+  const element = (
+    <I18nContext>
+      <OptionsPopover onClose={onClose} anchorElement={anchorElement} />
+    </I18nContext>
+  );
+  ReactDOM.render(element, container);
+}