Add AlphaPicker (Shopify#11728)

### WHY are these changes introduced?

Closes: https://github.com/Shopify/polaris-internal/issues/1510

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  Context about the problem that’s being addressed.
-->

### WHAT is this pull request doing?

Introduces a new picker, undocumented and prefixed with Alpha until it's
better tested in the admin.
Only single select / filtering needs to be working for the first release

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### How to 🎩

Change / add vendors
[here](https://admin.web.web-17ze.kyle-durand.us.spin.dev/store/shop1/products/5)

### 🎩 checklist

- [x] Tested a
[snapshot](https://github.com/Shopify/polaris/blob/main/documentation/Releasing.md#-snapshot-releases)
- [ ] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [x] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [x] Tested for
[accessibility](https://github.com/Shopify/polaris/blob/main/documentation/Accessibility%20testing.md)
- [ ] Updated the component's `README.md` with documentation changes
- [ ] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

.changeset/few-wolves-fail.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris': minor
+---
+
+Added new AlphaPicker component

polaris-react/playground/DetailsPage.tsx

@@ -44,6 +44,7 @@ import {
   TopBar,
   FooterHelp,
   Link,
+  AlphaPicker,
 } from '../src';
 import type {DropZoneProps, PageProps} from '../src';
 
@@ -54,6 +55,11 @@ export function DetailsPage() {
     emailFieldValue: '[email protected]',
     nameFieldValue: 'Jaded Pixel',
   });
+  const [query, setQuery] = useState('');
+  const [vendors, setVendors] = useState([
+    {value: 'The North Face', children: 'The North Face'},
+    {value: 'Patagonia', children: 'Patagonia'},
+  ]);
   const skipToContentRef = useRef<HTMLAnchorElement>(null);
   const [toastActive, setToastActive] = useState(false);
   const [isLoading, setIsLoading] = useState(false);
@@ -79,6 +85,16 @@ export function DetailsPage() {
   const [supportSubject, setSupportSubject] = useState('');
   const [supportMessage, setSupportMessage] = useState('');
 
+  const handleSelect = (selected: string) => {
+    setQuery('');
+    if (vendors.some((vendor) => vendor.children === selected)) return;
+
+    setVendors((vendors) => [
+      ...vendors,
+      {value: selected, children: selected},
+    ]);
+  };
+
   const handleDiscard = useCallback(() => {
     setEmailFieldValue(defaultState.current.emailFieldValue);
     setNameFieldValue(defaultState.current.nameFieldValue);
@@ -635,11 +651,24 @@ export function DetailsPage() {
                 value={selected}
               />
               <br />
-              <Select
-                label="Vendor"
-                options={options}
-                onChange={setSelected}
-                value={selected}
+              <AlphaPicker
+                onSelect={handleSelect}
+                activator={{
+                  label: 'Vendor',
+                  placeholder: 'None selected',
+                }}
+                searchField={{
+                  label: 'Search vendors',
+                  placeholder: 'Search or add new vendor',
+                  autoComplete: 'off',
+                  value: query,
+                  onChange: (value) => setQuery(value),
+                }}
+                options={vendors}
+                addAction={{
+                  value: query,
+                  children: `Add ${query}`,
+                }}
               />
             </LegacyCard.Section>
             <LegacyCard.Section title="Collections" />

polaris-react/src/components/Combobox/Combobox.tsx

@@ -31,7 +31,7 @@ export interface ComboboxProps {
   willLoadMoreOptions?: boolean;
   /** Height to set on the Popover Pane. */
   height?: string;
-  /** Callback fired when the bottom of the lisbox is reached. Use to lazy load when listbox option data is paginated. */
+  /** Callback fired when the bottom of the listbox is reached. Use to lazy load when listbox option data is paginated. */
   onScrolledToBottom?(): void;
   /** Callback fired when the popover closes */
   onClose?(): void;

polaris-react/src/components/Listbox/components/index.ts

@@ -1,5 +1,4 @@
-export {Option} from './Option';
-export type {OptionProps} from './Option';
+export * from './Option';
 export {TextOption} from './TextOption';
 export {Loading} from './Loading';
 export * from './Section';

polaris-react/src/components/Listbox/index.ts

@@ -1 +1,2 @@
 export * from './Listbox';
+export * from './components';

polaris-react/src/components/Picker/Picker.tsx

@@ -0,0 +1,258 @@
+import React, {useState, useMemo, useCallback, isValidElement} from 'react';
+import {SearchIcon} from '@shopify/polaris-icons';
+
+import {Popover} from '../Popover';
+import {
+  ComboboxTextFieldContext,
+  ComboboxListboxContext,
+  ComboboxListboxOptionContext,
+} from '../../utilities/combobox';
+import type {
+  ComboboxTextFieldType,
+  ComboboxListboxType,
+  ComboboxListboxOptionType,
+} from '../../utilities/combobox';
+import {Box} from '../Box';
+import type {TextFieldProps} from '../TextField';
+import type {ListboxProps, OptionProps} from '../Listbox';
+import {Listbox} from '../Listbox';
+import type {IconProps} from '../Icon';
+import {Icon} from '../Icon';
+
+import {Activator, SearchField} from './components';
+import type {ActivatorProps} from './components';
+
+export interface PickerProps extends Omit<ListboxProps, 'children'> {
+  /** Configure the button that activates the Picker */
+  activator: ActivatorProps;
+  /** Allows more than one option to be selected */
+  allowMultiple?: boolean;
+  /** The options to be listed within the picker */
+  options?: OptionProps[];
+  /** Used to add a new picker option that isn't listed */
+  addAction?: OptionProps & {icon?: IconProps['source']};
+  /** TextField that allows filtering of options */
+  searchField?: TextFieldProps;
+  /** Whether or not more options are available to lazy load when the bottom of the listbox reached. Use the hasMoreResults boolean provided by the GraphQL API of the paginated data. */
+  willLoadMoreOptions?: boolean;
+  /** Height to set on the Popover Pane. */
+  height?: string;
+  /** Callback fired when the bottom of the listbox is reached. Use to lazy load when listbox option data is paginated. */
+  onScrolledToBottom?(): void;
+  /** Callback fired when the popover closes */
+  onClose?(): void;
+}
+
+const FILTER_REGEX = (value: string) => new RegExp(value, 'i');
+const QUERY_REGEX = (value: string) => new RegExp(`^${value}$`, 'i');
+
+export function Picker({
+  activator,
+  allowMultiple,
+  searchField,
+  options = [],
+  willLoadMoreOptions,
+  height,
+  addAction,
+  onScrolledToBottom,
+  onClose,
+  ...listboxProps
+}: PickerProps) {
+  const activatorRef = React.createRef<HTMLButtonElement>();
+  const [activeItem, setActiveItem] = useState<string>();
+  const [popoverActive, setPopoverActive] = useState(false);
+  const [activeOptionId, setActiveOptionId] = useState<string>();
+  const [textFieldLabelId, setTextFieldLabelId] = useState<string>();
+  const [listboxId, setListboxId] = useState<string>();
+  const [query, setQuery] = useState<string>('');
+  const [filteredOptions, setFilteredOptions] = useState<OptionProps[] | null>(
+    options,
+  );
+
+  const shouldOpen = !popoverActive;
+  const handleClose = useCallback(() => {
+    setPopoverActive(false);
+    onClose?.();
+    activatorRef.current?.focus();
+  }, [activatorRef, onClose]);
+
+  const handleOpen = useCallback(() => {
+    setPopoverActive(true);
+  }, []);
+
+  const handleFocus = useCallback(() => {
+    if (shouldOpen) handleOpen();
+  }, [shouldOpen, handleOpen]);
+
+  const handleChange = useCallback(() => {
+    if (shouldOpen) handleOpen();
+  }, [shouldOpen, handleOpen]);
+
+  const handleBlur = useCallback(() => {
+    if (popoverActive) {
+      handleClose();
+      setQuery('');
+      setFilteredOptions(options);
+    }
+  }, [popoverActive, handleClose, options]);
+
+  const textFieldContextValue: ComboboxTextFieldType = useMemo(
+    () => ({
+      activeOptionId,
+      expanded: popoverActive,
+      listboxId,
+      setTextFieldLabelId,
+      onTextFieldFocus: handleFocus,
+      onTextFieldChange: handleChange,
+      onTextFieldBlur: handleBlur,
+    }),
+    [
+      activeOptionId,
+      popoverActive,
+      listboxId,
+      setTextFieldLabelId,
+      handleFocus,
+      handleChange,
+      handleBlur,
+    ],
+  );
+
+  const listboxOptionContextValue: ComboboxListboxOptionType = useMemo(
+    () => ({
+      allowMultiple,
+    }),
+    [allowMultiple],
+  );
+
+  const listboxContextValue: ComboboxListboxType = useMemo(
+    () => ({
+      listboxId,
+      textFieldLabelId,
+      textFieldFocused: popoverActive,
+      willLoadMoreOptions,
+      setActiveOptionId,
+      setListboxId,
+      onKeyToBottom: onScrolledToBottom,
+    }),
+    [
+      listboxId,
+      textFieldLabelId,
+      popoverActive,
+      willLoadMoreOptions,
+      setActiveOptionId,
+      setListboxId,
+      onScrolledToBottom,
+    ],
+  );
+
+  const updateText = useCallback(
+    (value: string) => {
+      setQuery(value);
+
+      if (value === '') {
+        setFilteredOptions(options);
+        return;
+      }
+
+      const resultOptions = options?.filter((option) =>
+        FILTER_REGEX(value).exec(reactChildrenText(option.children)),
+      );
+      setFilteredOptions(resultOptions ?? []);
+    },
+    [options],
+  );
+
+  const firstSelectedOption = reactChildrenText(
+    options.find((option) => option.value === activeItem)?.children,
+  );
+
+  const queryMatchesExistingOption = options.some((option) =>
+    QUERY_REGEX(query).exec(reactChildrenText(option.children)),
+  );
+
+  return (
+    <Popover
+      activator={
+        <Activator
+          {...activator}
+          onClick={handleOpen}
+          selected={firstSelectedOption || ''}
+          placeholder={activator.placeholder}
+          ref={activatorRef}
+        />
+      }
+      active={popoverActive}
+      autofocusTarget="none"
+      onClose={handleClose}
+      preferredPosition="cover"
+      preventFocusOnClose
+    >
+      <Popover.Pane onScrolledToBottom={onScrolledToBottom} height={height}>
+        {searchField ? (
+          <Box
+            paddingBlockStart="200"
+            paddingBlockEnd="100"
+            paddingInline="200"
+            borderBlockEndWidth="025"
+            borderColor="border"
+          >
+            <ComboboxTextFieldContext.Provider value={textFieldContextValue}>
+              <SearchField
+                {...searchField}
+                value={query}
+                onChange={(value) => {
+                  updateText(value);
+                  searchField.onChange?.(value, searchField.id ?? '');
+                }}
+                prefix={<Icon source={SearchIcon} />}
+                labelHidden
+                focused={popoverActive}
+              />
+            </ComboboxTextFieldContext.Provider>
+          </Box>
+        ) : null}
+
+        <ComboboxListboxContext.Provider value={listboxContextValue}>
+          <ComboboxListboxOptionContext.Provider
+            value={listboxOptionContextValue}
+          >
+            <Box paddingBlock="200">
+              <Listbox
+                {...listboxProps}
+                onSelect={(selected: string) => {
+                  setQuery('');
+                  updateText('');
+                  setActiveItem(selected);
+                  listboxProps.onSelect?.(selected);
+
+                  if (!allowMultiple) {
+                    handleClose();
+                  }
+                }}
+              >
+                {filteredOptions?.map((option) => (
+                  <Listbox.Option
+                    key={option.value}
+                    selected={option.value === activeItem}
+                    {...option}
+                  />
+                ))}
+                {addAction && query !== '' && !queryMatchesExistingOption ? (
+                  <Listbox.Action {...addAction} value={query} />
+                ) : null}
+              </Listbox>
+            </Box>
+          </ComboboxListboxOptionContext.Provider>
+        </ComboboxListboxContext.Provider>
+      </Popover.Pane>
+    </Popover>
+  );
+}
+
+const reactChildrenText = (children: React.ReactNode): string => {
+  if (typeof children === 'string') return children;
+
+  return isValidElement(children)
+    ? reactChildrenText(children?.props?.children)
+    : '';
+};

polaris-react/src/components/Picker/components/Activator/Activator.module.css

@@ -0,0 +1,31 @@
+.Activator {
+  background: none;
+  outline: none;
+  padding: var(--p-space-200) var(--p-space-300);
+  border-radius: var(--p-border-radius-200);
+  border: var(--p-border-width-025) solid var(--p-color-border);
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  cursor: pointer;
+
+  &:hover {
+    background-color: var(--p-color-bg-surface-hover);
+  }
+
+  &:active {
+    background-color: var(--p-color-bg-surface-active);
+  }
+
+  &:focus:not(:active) {
+    outline: var(--p-border-width-050) solid var(--p-color-border-focus);
+    outline-offset: var(--p-space-025);
+  }
+}
+
+.disabled {
+  pointer-events: none;
+  background-color: var(--p-color-bg-surface-disabled);
+  border-color: var(--p-color-border-disabled);
+}