Add SelectPanel alpha component

.changeset/khaki-meals-pay.md

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+---
+"@primer/components": patch
+---
+
+Add `SelectPanel` alpha component

docs/content/SelectPanel.mdx

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+---
+title: SelectPanel
+status: Alpha
+---
+
+A `SelectPanel` provides an anchor that will open an overlay with a list of selectable items, and a text input to filter the selectable items
+
+## Example
+
+## Component props

src/FilteredActionList/FilteredActionList.tsx

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+import React, {useCallback} from 'react'
+import {GroupedListProps, ListPropsBase} from '../ActionList/List'
+import TextInput, {TextInputProps} from '../TextInput'
+import Box from '../Box'
+import {ActionList} from '../ActionList'
+import Spinner from '../Spinner'
+
+export interface FilteredActionListProps extends Partial<Omit<GroupedListProps, keyof ListPropsBase>>, ListPropsBase {
+  loading?: boolean
+  placeholderText: string
+  onFilterChange: (value: string, e: React.ChangeEvent<HTMLInputElement>) => void
+  textInputProps?: Partial<Omit<TextInputProps, 'onChange'>>
+}
+
+export function FilteredActionList({
+  loading = false,
+  placeholderText,
+  onFilterChange,
+  items,
+  textInputProps,
+  ...listProps
+}: FilteredActionListProps): JSX.Element {
+  const onInputChange = useCallback(
+    (e: React.ChangeEvent<HTMLInputElement>) => {
+      const value = e.target.value
+      onFilterChange(value, e)
+    },
+    [onFilterChange]
+  )
+
+  return (
+    <>
+      <TextInput
+        block
+        width="auto"
+        color="text.primary"
+        onChange={onInputChange}
+        placeholder={placeholderText}
+        aria-label={placeholderText}
+        {...textInputProps}
+      />
+      <Box flexGrow={1} overflow="auto">
+        {loading ? (
+          <Box width="100%" display="flex" flexDirection="row" justifyContent="center" pt={6} pb={7}>
+            <Spinner />
+          </Box>
+        ) : (
+          <ActionList items={items} {...listProps} role="listbox" />
+        )}
+      </Box>
+    </>
+  )
+}
+
+FilteredActionList.displayName = 'FilteredActionList'

src/FilteredActionList/index.ts

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+export {FilteredActionList} from './FilteredActionList'
+export type {FilteredActionListProps} from './FilteredActionList'

src/SelectPanel/SelectPanel.tsx

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+import React, {useCallback, useMemo} from 'react'
+import {FilteredActionList, FilteredActionListProps} from '../FilteredActionList'
+import {OverlayProps} from '../Overlay'
+import {ItemInput} from '../ActionList/List'
+import {FocusZoneSettings} from '../behaviors/focusZone'
+import {DropdownButton} from '../DropdownMenu'
+import {ItemProps} from '../ActionList'
+import {AnchoredOverlay, AnchoredOverlayProps} from '../AnchoredOverlay'
+import Flex from '../Flex'
+import {TextInputProps} from '../TextInput'
+
+interface SelectPanelSingleSelection {
+  selected: ItemInput | undefined
+  onSelectedChange: (selected: ItemInput | undefined) => void
+}
+
+interface SelectPanelMultiSelection {
+  selected: ItemInput[]
+  onSelectedChange: (selected: ItemInput[]) => void
+}
+
+interface SelectPanelBaseProps {
+  renderAnchor?: AnchoredOverlayProps['renderAnchor']
+  onOpenChange: (
+    open: boolean,
+    gesture: 'anchor-click' | 'anchor-key-press' | 'click-outside' | 'escape' | 'selection'
+  ) => void
+  placeholder?: string
+  onFilterChange: (value: string, e?: React.ChangeEvent<HTMLInputElement>) => void
+  overlayProps?: Partial<OverlayProps>
+}
+
+export type SelectPanelProps = SelectPanelBaseProps &
+  Omit<FilteredActionListProps, 'onFilterChange' | 'selectionVariant'> &
+  Pick<AnchoredOverlayProps, 'open'> &
+  (SelectPanelSingleSelection | SelectPanelMultiSelection)
+
+function isMultiSelectVariant(
+  selected: SelectPanelSingleSelection['selected'] | SelectPanelMultiSelection['selected']
+): selected is SelectPanelMultiSelection['selected'] {
+  return Array.isArray(selected)
+}
+
+const focusZoneSettings: Partial<FocusZoneSettings> = {
+  focusOutBehavior: 'wrap',
+  focusableElementFilter: element => {
+    return !(element instanceof HTMLInputElement) || element.type !== 'checkbox'
+  }
+}
+
+const textInputProps: Partial<TextInputProps> = {
+  mx: 2,
+  my: 2,
+  contrast: true
+}
+
+export function SelectPanel({
+  open,
+  onOpenChange,
+  renderAnchor = props => <DropdownButton {...props} />,
+  placeholder,
+  selected,
+  onSelectedChange,
+  onFilterChange,
+  items,
+  overlayProps,
+  ...listProps
+}: SelectPanelProps): JSX.Element {
+  const onOpen: AnchoredOverlayProps['onOpen'] = useCallback(gesture => onOpenChange(true, gesture), [onOpenChange])
+  const onClose = useCallback(
+    (gesture: 'click-outside' | 'escape' | 'selection') => {
+      onOpenChange(false, gesture)
+      // ensure consuming component clears filter since the input will be blank on next open
+      onFilterChange('')
+    },
+    [onFilterChange, onOpenChange]
+  )
+
+  const renderMenuAnchor: AnchoredOverlayProps['renderAnchor'] = useCallback(
+    props => {
+      const selectedItems = Array.isArray(selected) ? selected : [...(selected ? [selected] : [])]
+
+      return renderAnchor({
+        ...props,
+        children: selectedItems.length ? selectedItems.map(item => item.text).join(', ') : placeholder
+      })
+    },
+    [placeholder, renderAnchor, selected]
+  )
+
+  const itemsToRender = useMemo(() => {
+    return items.map(item => {
+      const isItemSelected = isMultiSelectVariant(selected) ? selected.includes(item) : selected === item
+
+      return {
+        ...item,
+        role: 'option',
+        selected: 'selected' in item && item.selected === undefined ? undefined : isItemSelected,
+        onAction: (itemFromAction, event) => {
+          item.onAction?.(itemFromAction, event)
+
+          if (event.defaultPrevented) {
+            return
+          }
+
+          if (isMultiSelectVariant(selected)) {
+            // multi select
+            const otherSelectedItems = selected.filter(selectedItem => selectedItem !== item)
+            const newSelectedItems = selected.includes(item) ? otherSelectedItems : [...otherSelectedItems, item]
+
+            const multiSelectOnChange = onSelectedChange as SelectPanelMultiSelection['onSelectedChange']
+            multiSelectOnChange(newSelectedItems)
+            return
+          }
+
+          // single select
+          const singleSelectOnChange = onSelectedChange as SelectPanelSingleSelection['onSelectedChange']
+          singleSelectOnChange(item === selected ? undefined : item)
+          onClose('selection')
+        }
+      } as ItemProps
+    })
+  }, [onClose, onSelectedChange, items, selected])
+
+  return (
+    <AnchoredOverlay
+      renderAnchor={renderMenuAnchor}
+      open={open}
+      onOpen={onOpen}
+      onClose={onClose}
+      overlayProps={overlayProps}
+      focusZoneSettings={focusZoneSettings}
+    >
+      <Flex flexDirection="column" width="100%" height="100%">
+        <FilteredActionList
+          onFilterChange={onFilterChange}
+          {...listProps}
+          role="listbox"
+          items={itemsToRender}
+          selectionVariant={isMultiSelectVariant(selected) ? 'multiple' : 'single'}
+          textInputProps={textInputProps}
+        />
+      </Flex>
+    </AnchoredOverlay>
+  )
+}
+
+SelectPanel.displayName = 'SelectPanel'

src/SelectPanel/index.ts

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+export {SelectPanel} from './SelectPanel'
+export type {SelectPanelProps} from './SelectPanel'

src/__tests__/SelectPanel.tsx

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+import {cleanup, render as HTMLRender} from '@testing-library/react'
+import 'babel-polyfill'
+import {axe, toHaveNoViolations} from 'jest-axe'
+import React from 'react'
+import theme from '../theme'
+import {SelectPanel} from '../SelectPanel'
+import {COMMON} from '../constants'
+import {behavesAsComponent, checkExports} from '../utils/testing'
+import {BaseStyles, ThemeProvider} from '..'
+import {ItemInput} from '../ActionList/List'
+
+expect.extend(toHaveNoViolations)
+
+const items = [{text: 'Foo'}, {text: 'Bar'}, {text: 'Baz'}, {text: 'Bon'}] as ItemInput[]
+
+function SimpleSelectPanel(): JSX.Element {
+  const [selected, setSelected] = React.useState<ItemInput[]>([])
+  const [, setFilter] = React.useState('')
+  const [open, setOpen] = React.useState(false)
+
+  return (
+    <ThemeProvider theme={theme}>
+      <BaseStyles>
+        <SelectPanel
+          items={items}
+          placeholder="Select Items"
+          placeholderText="Filter Items"
+          selected={selected}
+          onSelectedChange={setSelected}
+          onFilterChange={setFilter}
+          open={open}
+          onOpenChange={setOpen}
+        />
+        <div id="portal-root"></div>
+      </BaseStyles>
+    </ThemeProvider>
+  )
+}
+
+describe('SelectPanel', () => {
+  afterEach(() => {
+    jest.clearAllMocks()
+  })
+
+  behavesAsComponent({
+    Component: SelectPanel,
+    systemPropArray: [COMMON],
+    options: {skipAs: true, skipSx: true},
+    toRender: () => <SimpleSelectPanel />
+  })
+
+  checkExports('SelectPanel', {
+    default: undefined,
+    SelectPanel
+  })
+
+  it('should have no axe violations', async () => {
+    const {container} = HTMLRender(<SimpleSelectPanel />)
+    const results = await axe(container)
+    expect(results).toHaveNoViolations()
+    cleanup()
+  })
+})