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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| import { useState } from 'react' | ||
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| type State = Record<number, number> | ||
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| const useCumulativeHeightState = () => { | ||
| const [state, set] = useState<State>({}) | ||
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| const updateRowHeight = ({ | ||
| height, | ||
| index, | ||
| }: { | ||
| height: number | ||
| index: number | ||
| }) => { | ||
| if (state[index] === height) { | ||
| return | ||
| } | ||
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| set(prev => ({ ...prev, [index]: height })) | ||
| } | ||
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| const getAccumulatedHeight = (index: number) => { | ||
| const sortedIndices = Object.keys(state) | ||
| .map(key => parseInt(key, 10)) | ||
| .sort((a, b) => a - b) | ||
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| const indices = sortedIndices.slice(0, sortedIndices.indexOf(index)) | ||
| return indices.reduce((acc, cur) => (state[cur] || 0) + acc, 0) | ||
| } | ||
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| return { | ||
| getAccumulatedHeight, | ||
| updateRowHeight, | ||
| } | ||
| } | ||
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| export default useCumulativeHeightState |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| import { useState, useLayoutEffect, useCallback } from 'react' | ||
| import throttle from 'throttleit' | ||
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| const listeners = new Set<Function>() | ||
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| const scrollHandler = throttle(() => { | ||
| const scrollOffset = window.pageYOffset | ||
| listeners.forEach(fn => fn(scrollOffset)) | ||
| }, 100) | ||
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| function detach(fn: Function) { | ||
| listeners.delete(fn) | ||
| if (listeners.size === 0) { | ||
| window.removeEventListener('scroll', scrollHandler) | ||
| } | ||
| } | ||
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| function attach(fn: Function) { | ||
| if (listeners.size === 0) { | ||
| window.addEventListener('scroll', scrollHandler) | ||
| } | ||
| listeners.add(fn) | ||
| return () => detach(fn) | ||
| } | ||
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| /** | ||
| * Hook that handles the scroll position. | ||
| * It uses one single window scroll listener. | ||
| * @returns {Number} - scroll position value | ||
| */ | ||
| export function useScrollThreshold<T extends HTMLElement>({ | ||
| offset, | ||
| }: { | ||
| offset: number | ||
| }) { | ||
| // Initial element distance to the top of the container | ||
| const [initialOffsetTop, setInitialOffsetTop] = useState<number>() | ||
| const [hasReachedThreshold, setReachedThreshold] = useState(false) | ||
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| // We use this callback as a ref to get the instance of the element once its mounted | ||
| // Reference: https://reactjs.org/docs/hooks-faq.html#how-can-i-measure-a-dom-node | ||
| const mountedDivRef = useCallback( | ||
| (node: T) => { | ||
| if (node !== null) { | ||
| // `offsetTop` can be used for position:sticky, but not for position:fixed | ||
| // If we decide to change the css implementation for a js one, this should be revisited | ||
| setInitialOffsetTop(node.offsetTop) | ||
| } | ||
| }, | ||
| // The rule below is disabled because we want to get a new callback every time | ||
| // the `offset` changes, which is a way to listen for possible sticky row size changes | ||
| // eslint-disable-next-line react-hooks/exhaustive-deps | ||
| [offset] | ||
| ) | ||
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| useLayoutEffect( | ||
| () => | ||
| attach((scroll: number) => { | ||
| const reached = | ||
| initialOffsetTop != null && initialOffsetTop - scroll <= offset | ||
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| // checks if reached state has changed | ||
| // if not, do nothing | ||
| if (hasReachedThreshold === reached) return | ||
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| // otherwise, update the state | ||
| setReachedThreshold(reached) | ||
| }), | ||
| [hasReachedThreshold, initialOffsetTop, offset] | ||
| ) | ||
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| return { | ||
| hasReachedThreshold, | ||
| ref: mountedDivRef, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| declare module 'throttleit' |