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Merge branch 'feature/applications' of github.com:multiversx/mx-explo…
…rer-dapp into feature/staking-v4
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| import { MouseEvent, useEffect, useMemo, useRef, useState } from 'react'; | ||
|
|
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| export const useScollInView = () => { | ||
| const [elementsIndexesInView, setElementsIndexesInView] = useState<number[]>( | ||
| [] | ||
| ); | ||
|
|
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| const scrollableElements = useRef<HTMLElement[]>([]); | ||
| const dispersionIndexes = scrollableElements.current.map((_, index) => index); | ||
|
|
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| const shouldDisplayArrow = (index: number) => | ||
| elementsIndexesInView.length > 0 && !elementsIndexesInView.includes(index); | ||
|
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| const [firstElementIndex] = dispersionIndexes; | ||
| const [lastElementIndex] = dispersionIndexes.slice().reverse(); | ||
|
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| const showLeftInViewArrow = shouldDisplayArrow(firstElementIndex); | ||
| const showRightInViewArrow = shouldDisplayArrow(lastElementIndex); | ||
|
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| const handleElementReference = (element: HTMLElement | null) => { | ||
| if (!element || scrollableElements.current.includes(element)) { | ||
| return; | ||
| } | ||
|
|
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| scrollableElements.current.push(element); | ||
| }; | ||
|
|
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| const handleScrollIntoView = (elementIndex: number) => { | ||
| const elementToScrollToView = scrollableElements.current[elementIndex]; | ||
| const scrollIntoViewOptions: ScrollIntoViewOptions = { | ||
| behavior: 'smooth', | ||
| inline: 'center', | ||
| block: 'nearest' | ||
| }; | ||
|
|
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| elementToScrollToView.scrollIntoView(scrollIntoViewOptions); | ||
| }; | ||
|
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| const handlePreviousArrowClick = (event: MouseEvent<HTMLElement>) => { | ||
| const previousElementIndex = Math.min(...elementsIndexesInView); | ||
| const previousElementExists = elementsIndexesInView.length > 1; | ||
| const processedIndex = previousElementExists | ||
| ? previousElementIndex | ||
| : previousElementIndex - 1; | ||
|
|
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| event.preventDefault(); | ||
| event.stopPropagation(); | ||
| handleScrollIntoView(processedIndex); | ||
| }; | ||
|
|
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| const handleNextArrowClick = (event: MouseEvent<HTMLElement>) => { | ||
| const nextElementIndex = Math.max(...elementsIndexesInView); | ||
| const nextElementExists = elementsIndexesInView.length > 1; | ||
| const processedIndex = nextElementExists | ||
| ? nextElementIndex | ||
| : nextElementIndex + 1; | ||
|
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| event.preventDefault(); | ||
| event.stopPropagation(); | ||
| handleScrollIntoView(processedIndex); | ||
| }; | ||
|
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| const processIndexFromEntry = ( | ||
| currentInViewEntry: IntersectionObserverEntry | ||
| ) => { | ||
| const currentElement = currentInViewEntry.target as HTMLElement; | ||
| const currentIndex = Number(currentElement.dataset.index); | ||
|
|
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| return currentIndex; | ||
| }; | ||
|
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| const filterIntersections = (observerEntry: IntersectionObserverEntry) => | ||
| observerEntry.isIntersecting; | ||
|
|
||
| const updateElementInViewStatus = ( | ||
| observerEntries: IntersectionObserverEntry[] | ||
| ) => { | ||
| setElementsIndexesInView((currentIndexesInView) => { | ||
| if (currentIndexesInView.length === 0) { | ||
| return observerEntries | ||
| .filter(filterIntersections) | ||
| .map(processIndexFromEntry); | ||
| } | ||
|
|
||
| const newOutViewIndexes = observerEntries | ||
| .filter((observerEntry) => !observerEntry.isIntersecting) | ||
| .map(processIndexFromEntry); | ||
|
|
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| const newInViewIndexes = observerEntries | ||
| .filter(filterIntersections) | ||
| .map(processIndexFromEntry); | ||
|
|
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| const cumulatedIndexes = currentIndexesInView.concat(newInViewIndexes); | ||
| const updatedElementInViewIndexes = cumulatedIndexes.filter( | ||
| (index) => !newOutViewIndexes.includes(index) | ||
| ); | ||
|
|
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| return updatedElementInViewIndexes; | ||
| }); | ||
| }; | ||
|
|
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| const observer = useMemo( | ||
| () => | ||
| new IntersectionObserver(updateElementInViewStatus, { | ||
| threshold: 1, | ||
| rootMargin: '100% 0% 100% 0%' | ||
| }), | ||
| [scrollableElements] | ||
| ); | ||
|
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| useEffect(() => { | ||
| scrollableElements.current.forEach((scrollableElement) => { | ||
| observer.observe(scrollableElement); | ||
| }); | ||
|
|
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| return () => observer.disconnect(); | ||
| }, []); | ||
|
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| return { | ||
| handleElementReference, | ||
| handleNextArrowClick, | ||
| handlePreviousArrowClick, | ||
| showLeftInViewArrow, | ||
| showRightInViewArrow | ||
| }; | ||
| }; |
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