|
| 1 | +import clsx from 'clsx'; |
| 2 | +import { GessoComponent } from 'gesso'; |
| 3 | +import { KeyboardEvent, createRef, useId, useMemo, useState } from 'react'; |
| 4 | +import styles from './accordion.module.css'; |
| 5 | +import getCssVar from '../../06-utility/getCssVar'; |
| 6 | +import { KEYCODE } from '../../00-config/constants'; |
| 7 | +import AccordionItem, { AccordionItemProps } from './AccordionItem'; |
| 8 | + |
| 9 | +interface AccordionProps extends GessoComponent { |
| 10 | + accordionItems: AccordionItemProps[]; |
| 11 | + accordionSpeed?: string; |
| 12 | + allowMultiple?: boolean; |
| 13 | + allowToggle?: boolean; |
| 14 | +} |
| 15 | + |
| 16 | +function Accordion({ |
| 17 | + accordionItems, |
| 18 | + accordionSpeed = getCssVar('duration-standard'), |
| 19 | + allowMultiple, |
| 20 | + allowToggle, |
| 21 | + modifierClasses, |
| 22 | +}: AccordionProps): JSX.Element { |
| 23 | + const accordionId = useId(); |
| 24 | + const [accordionItemsStatus, setAccordionItemsStatus] = useState( |
| 25 | + accordionItems.map((item, index) => ({ |
| 26 | + ...item, |
| 27 | + id: `${accordionId}-${index}`, |
| 28 | + })), |
| 29 | + ); |
| 30 | + const accordionItemRefs = useMemo(() => { |
| 31 | + const refs: { [key: string]: React.RefObject<HTMLButtonElement> } = {}; |
| 32 | + accordionItemsStatus.forEach(item => (refs[item.id] = createRef())); |
| 33 | + return refs; |
| 34 | + }, [accordionItemsStatus]); |
| 35 | + |
| 36 | + const openAccordionItem = (items: AccordionItemProps[], index: number) => { |
| 37 | + return [ |
| 38 | + ...items.slice(0, index), |
| 39 | + { |
| 40 | + ...items[index], |
| 41 | + isOpen: true, |
| 42 | + }, |
| 43 | + ...items.slice(index + 1), |
| 44 | + ]; |
| 45 | + }; |
| 46 | + |
| 47 | + const closeAccordionItem = (items: AccordionItemProps[], index: number) => { |
| 48 | + return [ |
| 49 | + ...items.slice(0, index), |
| 50 | + { |
| 51 | + ...items[index], |
| 52 | + isOpen: false, |
| 53 | + }, |
| 54 | + ...items.slice(index + 1), |
| 55 | + ]; |
| 56 | + }; |
| 57 | + |
| 58 | + const handleClick = (id: string, isOpen = false) => { |
| 59 | + const toggleAllowed = allowMultiple ? true : allowToggle; |
| 60 | + const active = accordionItemsStatus.findIndex(item => item.isOpen); |
| 61 | + const itemIndex = accordionItemsStatus.findIndex(item => item.id === id); |
| 62 | + let itemStatusUpdated = [...accordionItemsStatus]; |
| 63 | + |
| 64 | + // Without allowMultiple, close the open accordion |
| 65 | + if (!allowMultiple && active !== -1 && active !== itemIndex) { |
| 66 | + itemStatusUpdated = closeAccordionItem(itemStatusUpdated, active); |
| 67 | + } |
| 68 | + |
| 69 | + if (!isOpen) { |
| 70 | + itemStatusUpdated = openAccordionItem(itemStatusUpdated, itemIndex); |
| 71 | + } else if (toggleAllowed && isOpen) { |
| 72 | + itemStatusUpdated = closeAccordionItem(itemStatusUpdated, itemIndex); |
| 73 | + } |
| 74 | + |
| 75 | + return setAccordionItemsStatus(itemStatusUpdated); |
| 76 | + }; |
| 77 | + |
| 78 | + const handleKeydown = (event: KeyboardEvent) => { |
| 79 | + const currentTarget = event.target as HTMLButtonElement; |
| 80 | + |
| 81 | + // Create the array of toggle elements for the accordion group |
| 82 | + const triggers = Object.values(accordionItemRefs).map(ref => ref.current); |
| 83 | + |
| 84 | + // Is this coming from an accordion header? |
| 85 | + if (triggers && currentTarget.tagName === 'BUTTON') { |
| 86 | + // Up/ Down arrow and Control + Page Up/ Page Down keyboard operations |
| 87 | + if ( |
| 88 | + event.code === KEYCODE.UP || |
| 89 | + event.code === KEYCODE.DOWN || |
| 90 | + event.code === KEYCODE.PAGEUP || |
| 91 | + event.code === KEYCODE.PAGEDOWN |
| 92 | + ) { |
| 93 | + const index = triggers.indexOf(currentTarget); |
| 94 | + let direction; |
| 95 | + if (event.code === KEYCODE.DOWN || event.code === KEYCODE.PAGEDOWN) { |
| 96 | + direction = 1; |
| 97 | + } else { |
| 98 | + direction = -1; |
| 99 | + } |
| 100 | + const triggerLength = triggers.length; |
| 101 | + const newIndex = (index + triggerLength + direction) % triggerLength; |
| 102 | + triggers[newIndex]?.focus(); |
| 103 | + event.preventDefault(); |
| 104 | + } else if (event.code === KEYCODE.HOME || event.code === KEYCODE.END) { |
| 105 | + switch (event.code) { |
| 106 | + // Go to first accordion |
| 107 | + case KEYCODE.HOME: |
| 108 | + triggers[0]?.focus(); |
| 109 | + break; |
| 110 | + // Go to last accordion |
| 111 | + case KEYCODE.END: |
| 112 | + triggers[triggers.length - 1]?.focus(); |
| 113 | + break; |
| 114 | + default: |
| 115 | + triggers[0]?.focus(); |
| 116 | + break; |
| 117 | + } |
| 118 | + event.preventDefault(); |
| 119 | + } |
| 120 | + } |
| 121 | + }; |
| 122 | + |
| 123 | + return ( |
| 124 | + <> |
| 125 | + <div |
| 126 | + className={clsx(styles.accordion, modifierClasses)} |
| 127 | + id={accordionId} |
| 128 | + onKeyDown={handleKeydown} |
| 129 | + > |
| 130 | + <div className={styles.content}> |
| 131 | + {accordionItemsStatus.map(item => { |
| 132 | + return ( |
| 133 | + <AccordionItem |
| 134 | + key={item.id} |
| 135 | + {...item} |
| 136 | + accordionSpeed={accordionSpeed} |
| 137 | + toggleRef={accordionItemRefs[item.id]} |
| 138 | + handleClick={() => handleClick(item.id, item.isOpen)} |
| 139 | + /> |
| 140 | + ); |
| 141 | + })} |
| 142 | + </div> |
| 143 | + </div> |
| 144 | + </> |
| 145 | + ); |
| 146 | +} |
| 147 | + |
| 148 | +export default Accordion; |
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