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refactor: decouple overflow logic to create independent overflow utility
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| import { useState, useRef, ForwardedRef } from 'react'; | ||
| import { useResizeObserver } from './useResizeObserver'; | ||
|
|
||
| type Item = { | ||
| id: string; | ||
| }; | ||
|
|
||
| export function useOverflowItems<T extends Item>( | ||
| items: T[] = [], | ||
| ref?: ForwardedRef<HTMLDivElement>, | ||
| maxVisible?: number, | ||
| onChange?: (hiddenItems: T[]) => void | ||
| ) { | ||
| const localRef = useRef<HTMLDivElement>(null); | ||
| const itemRefs = useRef<Map<number, number> | null>(null); | ||
| const [containerWidth, setContainerWidth] = useState<number>(0); | ||
| const containerRef = ref || localRef; | ||
| const visibleItemCount = useRef<number>(0); | ||
|
|
||
| const handleResize = () => { | ||
| if (typeof containerRef !== 'function' && containerRef.current) { | ||
| setContainerWidth(containerRef.current.offsetWidth); | ||
| } | ||
| }; | ||
|
|
||
| const getMap = (): Map<string | number, number> => { | ||
| if (!itemRefs.current) { | ||
| itemRefs.current = new Map(); | ||
| } | ||
| return itemRefs.current; | ||
| }; | ||
|
|
||
| const itemRefHandler = ( | ||
| id: string | number, | ||
| node: HTMLElement | null | ||
| ): void => { | ||
| const map = getMap(); | ||
| if (node && !map.get(id)) { | ||
| const style = getComputedStyle?.(node); | ||
| const totalWidth = style | ||
| ? parseInt(style.marginLeft) + | ||
| parseInt(style.marginRight) + | ||
| node.offsetWidth | ||
| : node.offsetWidth; | ||
| map.set(id, totalWidth); | ||
| } | ||
| }; | ||
|
|
||
| const getItems = (): T[] => { | ||
| const map = getMap(); | ||
| if (!map) { | ||
| return items; | ||
| } | ||
| const maxWidth = containerWidth; | ||
| let maxReached = false; | ||
| let totalWidth = 0; | ||
|
|
||
| return items.reduce((prev, cur) => { | ||
| if (maxVisible && prev.length >= maxVisible) { | ||
| maxReached = true; | ||
| } | ||
| if (!maxReached) { | ||
| const itemWidth = map.get(cur.id) || 0; | ||
| const willFit = itemWidth + totalWidth <= maxWidth; | ||
| if (willFit) { | ||
| totalWidth += itemWidth; | ||
| prev.push(cur); | ||
| } else { | ||
| maxReached = true; | ||
| } | ||
| } | ||
| return prev; | ||
| }, [] as T[]); | ||
| }; | ||
|
|
||
| useResizeObserver(containerRef, handleResize); | ||
|
|
||
| const visibleItems = getItems(); | ||
| const visibleItemsNum = visibleItems.length; | ||
| const hiddenItems = items.slice(visibleItemsNum); | ||
| // only call the change handler when the number of visible items has changed | ||
| if (visibleItemsNum !== visibleItemCount.current) { | ||
| visibleItemCount.current = visibleItemsNum; | ||
| onChange?.(hiddenItems); | ||
| } | ||
|
|
||
| return { | ||
| visibleItems, | ||
| hiddenItems, | ||
| containerRef, | ||
| itemRefHandler, | ||
| }; | ||
| } | ||