# All files / src/TieredSelect LeafSelectionTieredSelect.tsx

87% Statements 87/100
45.28% Branches 24/53
66.66% Functions 6/9
85.05% Lines 74/87

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     import React from 'react'
    import { MenuRef } from '../MenuImperative/MenuImperative.types'
    import { OverlayTrigger } from '../OverlayTrigger/OverlayTrigger'
    import { Select } from '../Select/Select'
    import { isEventSource } from '../_hooks/ClickOutside'
    import { useI18nContext } from '../_hooks/I18n'
    import { TieredSelectContext } from './TieredSelect'
    import {
      Id,
      InternalTieredSelectProps,
      Tier,
      TierSelection,
    } from './TieredSelect.types'
    import { TieredSelectMenu } from './TieredSelectMenu'

    function stopProp(e: React.KeyboardEvent<HTMLDivElement>) {
      Iif (e.key === 'Escape' || e.key === 'Esc') {
        e.stopPropagation()
      }
    }
    const empty: any[] = []

    const hideKeys = {
      overlay: ['Escape', 'Esc'],
      target: ['Escape', 'Esc'],
    }

    export const LeafSelectionTieredSelect = React.forwardRef<
      HTMLDivElement,
      InternalTieredSelectProps
    >(function LeafSelectionTieredSelect(
      {
        className,
        disabled = false,
        error = false,
        loading = false,
        onKeyDown, // goes no where
        options = empty,
        value = empty,
        ...props
      },
      ref
    ) {
      const {
        afterHide,
        afterShow,
        beforeHide,
        beforeShow,
        block,
        getGroupId,
        getNextGroupId,
        getValueString,
        i18nScope,
        isLeaf,
        onChange,
        onClear,
        onNavigate,
        onSearch,
        tabIndex,
      } = React.useContext(TieredSelectContext)
      const I18n = useI18nContext()

      const tieredSelectMenuRef = React.useRef<MenuRef>(null)
      const tieredSelectButtonRef = React.useRef<HTMLDivElement>(null)
      const clearRef = React.createRef<HTMLButtonElement>()

      const [valueString, setValueString] = React.useState<string | undefined>('')
      const [currentTier, setCurrentTier] = React.useState<Id>(null)

      // internal value used for navigation
      const [internalValue, setInternalValue] = React.useState<Tier[]>(value)
      // value to reset to if navigation occurs but no selection has been made
      const [previousValue, setPreviousValue] = React.useState<Tier[]>(value)

      // if value prop changes, update value state, current tier, and set button label
      // else open to root
      React.useEffect(
        function () {
          const lastEntryInValue = value[value.length - 1]

          if (value.length > 0) {
            setInternalValue(value)
            setPreviousValue(value)
            setValueString(getValueString(value))
            // show children of last tier in value if not a leaf node
            // otherwise we want to show the parent of the last tier in value
            if (isLeaf && !isLeaf(lastEntryInValue)) {
              setCurrentTier(getNextGroupId(lastEntryInValue))
            } else E{
              setCurrentTier(getGroupId(lastEntryInValue))
            }
          } else {
            setCurrentTier(null)
            setInternalValue([])
            setPreviousValue([])
            setValueString('')
          }
        },
        [getGroupId, getValueString, getNextGroupId, isLeaf, value]
      )

      const internalOnChange = React.useCallback(
        function (selection: TierSelection) {
          setInternalValue(selection.value)
          setPreviousValue(selection.value)
          setValueString(getValueString(selection.value))
          setCurrentTier(getGroupId(selection.item))
          onChange(selection)
        },
        [getGroupId, onChange, getValueString]
      )

      const internalOnNavigate = React.useCallback(
        function (nextGroupId: Id, value: any[]) {
          setInternalValue(value)
          setCurrentTier(nextGroupId)
          onNavigate && onNavigate(nextGroupId, value)
        },
        [onNavigate]
      )

      const internalOnClear = React.useCallback(
        function (event: React.MouseEvent<HTMLButtonElement>) {
          setValueString('')
          setInternalValue([])
          setPreviousValue([])
          internalOnNavigate(null, [])
          onClear && onClear(event)
        },
        [internalOnNavigate, onClear]
      )

      const internalOnSearch = React.useCallback(
        function (event: any) {
          onSearch && onSearch(event)
        },
        [onSearch]
      )

      const internalBeforeHide = React.useCallback(
        function (e: Event) {
          const isEscapeKey =
            e instanceof KeyboardEvent && (e.key === 'Escape' || e.key === 'Esc')

          const isClickOutside =
            e instanceof MouseEvent &&
            !isEventSource({ current: tieredSelectMenuRef?.current?.el }, e)

          const lastValue = previousValue[previousValue.length - 1]

          Iif (valueString && (isClickOutside || isEscapeKey)) {
            setInternalValue(previousValue)
            if (isLeaf && isLeaf(lastValue)) {
              setCurrentTier(getGroupId(lastValue))
            } else {
              setCurrentTier(getNextGroupId(lastValue))
            }
          }
          return beforeHide && beforeHide(e)
        },
        [
          beforeHide,
          getGroupId,
          getNextGroupId,
          isLeaf,
          tieredSelectMenuRef,
          previousValue,
          valueString,
        ]
      )

      return (
        <OverlayTrigger
          autoFocus
          afterHide={afterHide}
          afterShow={afterShow}
          beforeHide={internalBeforeHide}
          beforeShow={(e: Event) => {
            return beforeShow && e.target !== clearRef.current && beforeShow(e)
          }}
          canFlip={true}
          hideKeys={hideKeys}
          overlay={
            <TieredSelectMenu
              currentTier={currentTier}
              options={options}
              loading={loading}
              menuRef={tieredSelectMenuRef}
              onNavigate={internalOnNavigate}
              onSearch={internalOnSearch}
              onChange={internalOnChange}
              value={internalValue}
              previousValue={previousValue}
              {...props}
              onKeyDown={stopProp}
            />
          }
          placement="bottom-left"
          ref={ref}
          trigger="click"
        >
          <Select.Button
            block={block}
            className={className}
            clearRef={clearRef}
            disabled={disabled}
            error={error}
            label={valueString}
            loading={loading}
            placeholder={I18n.t('placeholder', { scope: i18nScope })}
            onClear={internalOnClear}
            ref={tieredSelectButtonRef}
            tabIndex={tabIndex}
          >
            {valueString || I18n.t('placeholder', { scope: i18nScope })}
          </Select.Button>
        </OverlayTrigger>
      )
    })