typescript
This commit is contained in:
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import {
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useCallback,
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useEffect,
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useMemo,
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useRef,
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useState,
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} from 'react';
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import type { JSX } from 'react';
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import { CheckIcon, ChevronDownIcon } from '../../ui/icons';
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type CapabilityValue = string | number;
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export interface CapabilityDropdownOption {
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value?: CapabilityValue | null;
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id?: CapabilityValue | null;
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label?: string;
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}
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interface CapabilityDropdownProps {
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id?: string;
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options?: Array<CapabilityDropdownOption | CapabilityValue>;
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selectedValues?: CapabilityValue[];
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onSelect?: (value: CapabilityValue) => void;
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onDeselect?: (value: CapabilityValue) => void;
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formatLabel?: (value: CapabilityValue) => string;
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disabled?: boolean;
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loading?: boolean;
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summaryLabel?: string;
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}
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const resolveCapabilityValue = (
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option: CapabilityDropdownOption | CapabilityValue | null | undefined,
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): CapabilityValue | null => {
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if (option == null) {
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return null;
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}
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if (typeof option === 'string' || typeof option === 'number') {
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return option;
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}
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if (option.value != null) {
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return option.value;
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}
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if (option.id != null) {
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return option.id;
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}
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return null;
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};
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const CapabilityDropdown = ({
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id,
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options = [],
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selectedValues = [],
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onSelect,
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onDeselect,
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formatLabel,
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disabled = false,
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loading = false,
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summaryLabel = 'capabilities',
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}: CapabilityDropdownProps): JSX.Element => {
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const anchorRef = useRef<HTMLButtonElement | null>(null);
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const menuRef = useRef<HTMLDivElement | null>(null);
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const [isOpen, setIsOpen] = useState(false);
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const close = useCallback(() => {
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setIsOpen(false);
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}, []);
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const toggle = useCallback(() => {
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if (disabled) {
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return;
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}
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setIsOpen((previous) => !previous);
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}, [disabled]);
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useEffect(() => {
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if (!isOpen) {
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return undefined;
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}
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const handlePointerEvent = (event: MouseEvent | TouchEvent) => {
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if (anchorRef.current?.contains(event.target as Node)) {
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return;
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}
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if (menuRef.current?.contains(event.target as Node)) {
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return;
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}
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close();
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};
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const handleKeyDown = (event: KeyboardEvent) => {
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if (event.key === 'Escape') {
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close();
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}
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};
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document.addEventListener('mousedown', handlePointerEvent);
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document.addEventListener('touchstart', handlePointerEvent, { passive: true });
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document.addEventListener('keydown', handleKeyDown);
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return () => {
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document.removeEventListener('mousedown', handlePointerEvent);
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document.removeEventListener('touchstart', handlePointerEvent);
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document.removeEventListener('keydown', handleKeyDown);
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};
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}, [close, isOpen]);
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const handleOptionClick = useCallback((value: CapabilityValue | null) => {
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if (value == null) {
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return;
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}
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if (selectedValues.includes(value)) {
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onDeselect?.(value);
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} else {
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onSelect?.(value);
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}
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}, [onDeselect, onSelect, selectedValues]);
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const derivedOptions = useMemo(() => options.filter(Boolean), [options]);
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const total = derivedOptions.length;
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const selectedCount = selectedValues.length;
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const summaryText = useMemo(() => {
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if (total) {
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return `${selectedCount}/${total} ${summaryLabel} enabled`;
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}
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if (selectedCount) {
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return `${selectedCount} ${summaryLabel} selected`;
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}
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if (loading) {
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return `Loading ${summaryLabel}…`;
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}
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return `No ${summaryLabel}`;
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}, [loading, selectedCount, summaryLabel, total]);
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const buttonText = total || selectedCount || loading ? summaryText : `Select ${summaryLabel}`;
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const emptyMessage = loading ? `Loading ${summaryLabel}…` : `No ${summaryLabel} available.`;
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const isDisabled = disabled || (total === 0 && !selectedCount) || loading;
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const menuId = id ? `${id}-menu` : undefined;
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return (
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<div className="capability-dropdown">
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<button
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type="button"
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className="capability-dropdown__trigger"
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aria-haspopup="menu"
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aria-expanded={isOpen}
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aria-controls={menuId}
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onClick={toggle}
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disabled={isDisabled}
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ref={anchorRef}
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>
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<span>{buttonText}</span>
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<ChevronDownIcon className="capability-dropdown__chevron" aria-hidden="true" />
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</button>
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{isOpen ? (
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<div
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id={menuId}
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role="menu"
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ref={menuRef}
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className="menu menu--floating capability-dropdown__menu"
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data-floating-position
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>
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{total ? (
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derivedOptions.map((option) => {
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const value = resolveCapabilityValue(option);
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if (value == null) {
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return null;
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}
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const label = typeof formatLabel === 'function'
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? formatLabel(value)
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: (typeof option === 'object' && option?.label) || String(value);
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const selected = selectedValues.includes(value);
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return (
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<button
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key={value}
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type="button"
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role="menuitemcheckbox"
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aria-checked={selected}
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className={`menu__item capability-dropdown__option${selected ? ' is-selected' : ''}`}
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onClick={() => handleOptionClick(value)}
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>
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<span className="capability-dropdown__option-icon">
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{selected ? <CheckIcon className="icon-inline" aria-hidden="true" /> : null}
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</span>
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<span className="capability-dropdown__option-label">{label}</span>
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</button>
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);
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})
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) : (
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<div className="capability-dropdown__empty">{emptyMessage}</div>
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)}
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</div>
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) : null}
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</div>
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);
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};
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export default CapabilityDropdown;
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