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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| 'use client' | ||
| import { | ||
| type ReactNode, | ||
| createContext, | ||
| useContext, | ||
| useEffect, | ||
| useMemo, | ||
| useRef, | ||
| useState, | ||
| } from 'react' | ||
|
|
||
| const ScrollSectionContext = createContext<{ | ||
| updateSection: (id: string, element: HTMLDivElement) => void | ||
| currentSection: string | null | ||
| }>({ | ||
| updateSection: () => {}, | ||
| currentSection: null, | ||
| }) | ||
|
|
||
| export const useScrollSectionContext = () => useContext(ScrollSectionContext) | ||
|
|
||
| export function ScrollSectionProvider({ | ||
| children, | ||
| }: { | ||
| children: ReactNode | ||
| }) { | ||
| const intersectionObserver = useRef<IntersectionObserver | null>(null) | ||
| const sectionElements = useRef<Record<string, HTMLDivElement>>({}) | ||
| const [intersectingSections, setIntersectingSections] = useState<string[]>([]) | ||
| const [lastIntersectedSection, setLastIntersectedSection] = useState<string | null>(null) | ||
|
|
||
| const currentSection = useMemo(() => { | ||
| if (intersectingSections.length) { | ||
| return intersectingSections[0] | ||
| } | ||
|
|
||
| return lastIntersectedSection | ||
| }, [intersectingSections, lastIntersectedSection]) | ||
|
|
||
| const updateSection = (id: string, element: HTMLDivElement) => { | ||
| if (sectionElements.current[id] === element) { | ||
| return | ||
| } | ||
|
|
||
| if (sectionElements.current[id]) { | ||
| intersectionObserver.current?.unobserve(sectionElements.current[id]) | ||
| } | ||
|
|
||
| sectionElements.current[id] = element | ||
| intersectionObserver.current?.observe(element) | ||
| } | ||
|
|
||
| useEffect(() => { | ||
| const observer = new IntersectionObserver( | ||
| (entries) => { | ||
| setIntersectingSections((sections) => { | ||
| const entriesId = entries | ||
| .map(({ isIntersecting, target }) => ({ | ||
| isIntersecting, | ||
| id: Object.entries(sectionElements.current).find( | ||
| ([, element]) => element === target | ||
| )?.[0], | ||
| })) | ||
| .filter((entry) => entry.id) as { id: string; isIntersecting: boolean }[] | ||
|
|
||
| const newIntersections = entriesId | ||
| .filter((entry) => !sections.includes(entry.id) && entry.isIntersecting) | ||
| .map((entry) => entry.id) | ||
|
|
||
| const notIntersecting = entriesId | ||
| .filter((entry) => !entry.isIntersecting) | ||
| .map((entry) => entry.id) | ||
|
|
||
| const newSections = sections | ||
| .filter((section) => !notIntersecting.includes(section)) | ||
| .concat(newIntersections) | ||
|
|
||
| newSections.sort((first, second) => { | ||
| const firstElement = sectionElements.current[first] | ||
| const secondElement = sectionElements.current[second] | ||
|
|
||
| if (!firstElement || !secondElement) { | ||
| return 0 | ||
| } | ||
|
|
||
| return ( | ||
| firstElement.getBoundingClientRect().top - | ||
| secondElement.getBoundingClientRect().top | ||
| ) | ||
| }) | ||
|
|
||
| if (newSections.length) { | ||
| setLastIntersectedSection(newSections[0]) | ||
| } | ||
|
|
||
| return newSections | ||
| }) | ||
| }, | ||
| { | ||
| rootMargin: '-140px 0px -40% 0px', | ||
| } | ||
| ) | ||
|
|
||
| for (const element of Object.values(sectionElements.current)) { | ||
| observer.observe(element) | ||
| } | ||
| }, []) | ||
|
|
||
| return ( | ||
| <ScrollSectionContext.Provider | ||
| value={{ | ||
| updateSection, | ||
| currentSection, | ||
| }} | ||
| > | ||
| {children} | ||
| </ScrollSectionContext.Provider> | ||
| ) | ||
| } | ||
|
|
||
| export const useScrollSection = (id?: string) => { | ||
| const { updateSection } = useScrollSectionContext() | ||
| const ref = useRef<HTMLDivElement>(null) | ||
|
|
||
| useEffect(() => { | ||
| if (id && ref.current) { | ||
| updateSection(id, ref.current) | ||
| } | ||
| }, [id, updateSection]) | ||
|
|
||
| return { | ||
| ref, | ||
| } | ||
| } | ||
|
|
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