Adds the data source selector and a useIndexPatterns hook

src/plugins/wizard/public/application/_variables.scss

@@ -1,3 +1,5 @@
 @import '@elastic/eui/src/global_styling/variables/header';
+@import '@elastic/eui/src/global_styling/variables/form';
 
-$osdHeaderOffset: $euiHeaderHeightCompensation * 2;
+$osdHeaderOffset: $euiHeaderHeightCompensation * 2;
+$wizSideNavWidth: 470px;

src/plugins/wizard/public/application/app.scss

@@ -4,7 +4,7 @@
   padding: 0;
   display: grid;
   grid-template-rows: min-content 1fr;
-  grid-template-columns: 470px 1fr;
+  grid-template-columns: $wizSideNavWidth 1fr;
   grid-template-areas: 
     "topNav topNav"
     "sideNav workspace"

src/plugins/wizard/public/application/components/data_source_select.tsx

@@ -0,0 +1,51 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import React from 'react';
+import { i18n } from '@osd/i18n';
+import { EuiIcon } from '@elastic/eui';
+import { SearchableDropdown, SearchableDropdownOption } from './searchable_dropdown';
+import { useIndexPatterns } from '../utils/use';
+import indexPatternSvg from '../../assets/index_pattern.svg';
+import { useTypedDispatch } from '../utils/state_management';
+import { setIndexPattern } from '../utils/state_management/visualization_slice';
+import { IndexPattern } from '../../../../data/public';
+
+function indexPatternEquality(A?: SearchableDropdownOption, B?: SearchableDropdownOption): boolean {
+  return !A || !B ? false : A.id === B.id;
+}
+
+function toSearchableDropdownOption(indexPattern: IndexPattern): SearchableDropdownOption {
+  return {
+    id: indexPattern.id || '',
+    label: indexPattern.title,
+    searchableLabel: indexPattern.title,
+    prepend: <EuiIcon type={indexPatternSvg} />,
+  };
+}
+
+export const DataSourceSelect = () => {
+  const { indexPatterns, loading, error, selected } = useIndexPatterns();
+  const dispatch = useTypedDispatch();
+
+  return (
+    <SearchableDropdown
+      selected={selected !== undefined ? toSearchableDropdownOption(selected) : undefined}
+      onChange={(option) => {
+        const foundOption = indexPatterns.filter((s) => s.id === option.id)[0];
+        if (foundOption !== undefined && typeof foundOption.id === 'string') {
+          dispatch(setIndexPattern(foundOption.id));
+        }
+      }}
+      prepend={i18n.translate('wizard.nav.dataSource.selector.title', {
+        defaultMessage: 'Data Source',
+      })}
+      error={error}
+      loading={loading}
+      options={indexPatterns.map(toSearchableDropdownOption)}
+      equality={indexPatternEquality}
+    />
+  );
+};

src/plugins/wizard/public/application/components/searchable_dropdown.scss

@@ -0,0 +1,26 @@
+@import "../variables";
+
+.searchableDropdown {
+  overflow: "hidden";
+}
+
+.searchableDropdown .euiPopover,
+.searchableDropdown .euiPopover__anchor {
+  width: 100%;
+}
+
+.searchableDropdown--fixedWidthChild {
+  width: calc(#{$wizSideNavWidth} - #{$euiSizeXL} * 2) ;
+}
+
+.searchableDropdown--topDisplay {
+  padding-right: $euiSizeL;
+}
+
+
+.searchableDropdown--selectableWrapper .euiSelectableList {
+  // When clicking on the selectable content it will "highlight" itself with a box shadow
+  // This turns that off
+  box-shadow: none !important;
+  margin: ($euiFormControlPadding * -1) - 4;
+}

src/plugins/wizard/public/application/components/searchable_dropdown.tsx

@@ -0,0 +1,170 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import React, { useState, useEffect } from 'react';
+import {
+  EuiLoadingSpinner,
+  EuiFormControlLayout,
+  EuiPopoverTitle,
+  EuiButtonEmpty,
+  EuiPopover,
+  EuiSelectable,
+  EuiTextColor,
+} from '@elastic/eui';
+import './searchable_dropdown.scss';
+
+export interface SearchableDropdownOption {
+  id: string;
+  label: string;
+  searchableLabel: string;
+  prepend: any;
+}
+
+interface SearchableDropdownProps {
+  selected?: SearchableDropdownOption;
+  onChange: (selection) => void;
+  options: SearchableDropdownOption[];
+  loading: boolean;
+  error?: Error;
+  prepend: string;
+  // not just the first time!
+  onOpen?: () => void;
+  equality: (A, B) => boolean;
+}
+
+type DisplayError = any;
+
+function displayError(error: DisplayError) {
+  return typeof error === 'object' ? error.toString() : <>{error}</>;
+}
+
+export const SearchableDropdown = ({
+  onChange,
+  equality,
+  selected,
+  options,
+  error,
+  loading,
+  prepend,
+  onOpen,
+}: SearchableDropdownProps) => {
+  const [localOptions, setLocalOptions] = useState<any[] | undefined>(undefined);
+  const [isPopoverOpen, setIsPopoverOpen] = useState(false);
+  const onButtonClick = () => {
+    if (!isPopoverOpen && typeof onOpen === 'function') {
+      onOpen();
+    }
+    setIsPopoverOpen(!isPopoverOpen);
+  };
+  const closePopover = () => setIsPopoverOpen(false);
+
+  function selectNewOption(newOptions) {
+    // alright, the EUI Selectable is pretty ratchet
+    // this is as smarmy as it is because it needs to be
+
+    // first go through and count all the "checked" options
+    const selectedCount = newOptions.filter((o) => o.checked === 'on').length;
+
+    // if the count is 0, the user just "unchecked" our selection and we can just do nothing
+    if (selectedCount === 0) {
+      setIsPopoverOpen(false);
+      return;
+    }
+
+    // then, if there's more than two selections, the Selectable left the previous selection as "checked"
+    // so we need to go and "uncheck" it
+    for (let i = 0; i < newOptions.length; i++) {
+      if (equality(newOptions[i], selected) && selectedCount > 1) {
+        delete newOptions[i].checked;
+      }
+    }
+
+    // finally, we can pick the checked option as the actual selection
+    const newSelection = newOptions.filter((o) => o.checked === 'on')[0];
+
+    setLocalOptions(newOptions);
+    setIsPopoverOpen(false);
+    onChange(newSelection);
+  }
+
+  useEffect(() => {
+    setLocalOptions(
+      options.map((o) => ({
+        ...o,
+        checked: equality(o, selected) ? 'on' : undefined,
+      }))
+    );
+  }, [selected, options, equality]);
+
+  const listDisplay = (list, search) =>
+    loading ? (
+      <div style={{ textAlign: 'center' }}>
+        <EuiLoadingSpinner />
+      </div>
+    ) : error !== undefined ? (
+      displayError(error)
+    ) : (
+      <>
+        <EuiPopoverTitle paddingSize="s" className="wizPopoverTitle">
+          {search}
+        </EuiPopoverTitle>
+        {list}
+      </>
+    );
+
+  const selectable = (
+    <div className="searchableDropdown--selectableWrapper">
+      <EuiSelectable
+        aria-label="Selectable options"
+        searchable
+        options={localOptions}
+        onChange={selectNewOption}
+        listProps={{
+          showIcons: false,
+        }}
+      >
+        {listDisplay}
+      </EuiSelectable>
+    </div>
+  );
+
+  const selectedText =
+    selected === undefined ? (
+      <EuiTextColor color="subdued">{loading ? 'Loading' : 'Select an option'}</EuiTextColor>
+    ) : (
+      <>
+        {selected.prepend} {selected.label}
+      </>
+    );
+
+  const selectedView = (
+    <EuiButtonEmpty
+      color="text"
+      style={{ textAlign: 'left' }}
+      className="searchableDropdown--topDisplay"
+      onClick={onButtonClick}
+    >
+      {selectedText}
+    </EuiButtonEmpty>
+  );
+
+  const formControl = <EuiFormControlLayout
+      title={selected === undefined ? "Select an option" : selected.label}
+      isLoading={loading}
+      fullWidth={true}
+      style={{ cursor: 'pointer' }}
+      prepend={prepend}
+      icon={{ type: 'arrowDown', side: 'right' }}
+      readOnly={true}
+    >{selectedView}</EuiFormControlLayout>
+
+  return (
+      <div className="searchableDropdown">
+        <EuiPopover button={formControl} isOpen={isPopoverOpen} closePopover={closePopover}>
+          <div className="searchableDropdown--fixedWidthChild">{selectable}</div>
+        </EuiPopover>
+      </div>
+  );
+};

src/plugins/wizard/public/application/components/side_nav.scss

@@ -1,4 +1,5 @@
 @import "../util";
+@import "../variables";
 
 .wizSidenav {
   @include scrollNavParent(auto 1fr);
@@ -7,10 +8,6 @@
   border-right: $euiBorderThin;
 }
 
-.wizDatasourceSelector {
-  padding: $euiSize $euiSize 0 $euiSize;
-}
-
 .wizSidenavTabs {
   .euiTab__content {
     text-transform: capitalize;
@@ -22,3 +19,8 @@
     @include scrollNavParent;
   }
 }
+
+.wizDatasourceSelect {
+   max-width: $wizSideNavWidth;
+   padding: $euiSize $euiSize 0 $euiSize;
+}

src/plugins/wizard/public/application/components/side_nav.tsx

@@ -3,35 +3,22 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import React from 'react';
-import { i18n } from '@osd/i18n';
-import { EuiFormLabel, EuiTabbedContent, EuiTabbedContentTab } from '@elastic/eui';
-import { useOpenSearchDashboards } from '../../../../opensearch_dashboards_react/public';
-import { WizardServices } from '../../types';
+import React, { ReactElement } from 'react';
+import { EuiTabbedContent, EuiTabbedContentTab } from '@elastic/eui';
 import './side_nav.scss';
-import { useTypedDispatch, useTypedSelector } from '../utils/state_management';
-import { setIndexPattern } from '../utils/state_management/visualization_slice';
 import { useVisualizationType } from '../utils/use';
+import { DataSourceSelect } from './data_source_select';
 import { DataTab } from '../contributions';
 import { StyleTabConfig } from '../../services/type_service';
 
 export const SideNav = () => {
-  const {
-    services: {
-      data,
-      savedObjects: { client: savedObjectsClient },
-    },
-  } = useOpenSearchDashboards<WizardServices>();
-  const { IndexPatternSelect } = data.ui;
-  const { indexPattern: indexPatternId } = useTypedSelector((state) => state.visualization);
-  const dispatch = useTypedDispatch();
   const {
     ui: { containerConfig },
   } = useVisualizationType();
 
   const tabs: EuiTabbedContentTab[] = Object.entries(containerConfig).map(
     ([containerName, config]) => {
-      let content = null;
+      let content: null | ReactElement = null;
       switch (containerName) {
         case 'data':
           content = <DataTab key="containerName" />;
@@ -52,27 +39,8 @@ export const SideNav = () => {
 
   return (
     <section className="wizSidenav">
-      <div className="wizDatasourceSelector">
-        <EuiFormLabel>
-          {i18n.translate('wizard.nav.dataSource.selector.title', {
-            defaultMessage: 'Index Pattern',
-          })}
-        </EuiFormLabel>
-        <IndexPatternSelect
-          savedObjectsClient={savedObjectsClient}
-          placeholder={i18n.translate('wizard.nav.dataSource.selector.placeholder', {
-            defaultMessage: 'Select index pattern',
-          })}
-          indexPatternId={indexPatternId || ''}
-          onChange={async (newIndexPatternId: any) => {
-            const newIndexPattern = await data.indexPatterns.get(newIndexPatternId);
-
-            if (newIndexPattern) {
-              dispatch(setIndexPattern(newIndexPatternId));
-            }
-          }}
-          isClearable={false}
-        />
+      <div className="wizDatasourceSelect">
+        <DataSourceSelect />
       </div>
       <EuiTabbedContent tabs={tabs} className="wizSidenavTabs" />
     </section>

src/plugins/wizard/public/application/utils/use/index.ts

@@ -4,4 +4,4 @@
  */
 
 export { useVisualizationType } from './use_visualization_type';
-export { useIndexPattern } from './use_index_pattern';
+export { useIndexPattern, useIndexPatterns } from './use_index_pattern';