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ColumnFiller
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// Live: https://startupgrad.io/#services | |
<ColumnFiller | |
items={services | |
.filter((service) => !selectedTag || service.tags.includes(selectedTag)) | |
.map((service) => ({ ...service, key: service.textsKey }))} | |
columnsCount={windowWidth > 900 ? 3 : windowWidth > 600 ? 2 : 1} | |
columnRender={({ children, index, width }) => ( | |
<div key={index} style={{ width }} className={css.column}> | |
{children} | |
</div> | |
)} | |
itemRender={({ item: service, setItemRef }) => ( | |
<Service key={service.textsKey} setItemRef={setItemRef} service={service} /> | |
)} | |
/> |
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import _ from 'lodash' | |
import React, { useEffect, useRef, useState } from 'react' | |
import { useWindowSize } from '../../lib/useWindowSize' | |
type ItemType<TItem extends { key: string } = { key: string }> = TItem | |
type ItemRender<TItem extends ItemType = ItemType> = (props: { | |
item: TItem | |
index: number | |
setItemRef: React.RefCallback<any> | |
}) => JSX.Element | |
const Item: React.FC<{ | |
index: number | |
item: ItemType<any> | |
itemRender: ItemRender<any> | |
itemHeights: Record<string, number> | |
setItemHeights: React.Dispatch<React.SetStateAction<Record<string, number>>> | |
}> = ({ index, itemRender, item, setItemHeights, itemHeights }) => { | |
const { width: windowWidth } = useWindowSize() | |
const itemRef = useRef<HTMLElement | null>() | |
useEffect(() => { | |
const height = itemRef.current?.offsetHeight || 0 | |
if (itemHeights[item.key] !== height) { | |
setItemHeights({ | |
...itemHeights, | |
[item.key]: height, | |
}) | |
} | |
}, [itemRef, setItemHeights, itemHeights, item.key, windowWidth]) | |
return itemRender({ | |
item, | |
index, | |
setItemRef: (ref) => (itemRef.current = ref), | |
}) | |
} | |
export const ColumnFiller = <TItem extends ItemType = ItemType>({ | |
items, | |
columnRender, | |
columnsCount, | |
itemRender, | |
}: { | |
items: TItem[] | |
columnRender: (props: { index: number; children: React.ReactNode; width: string }) => JSX.Element | |
columnsCount: number | |
itemRender: ItemRender<TItem> | |
}) => { | |
const [itemsWithColumnIndex, setItemsWithColumnIndex] = useState<Array<{ item: TItem; columnIndex: number }>>( | |
items.map((item) => ({ item, columnIndex: 0 })) | |
) | |
const columnWidth = `${(100 / columnsCount).toFixed(3)}%` | |
const [itemHeights, setItemHeights] = useState<Record<string, number>>({}) | |
useEffect(() => { | |
const normalizeItemsWithColumnIndex = () => { | |
const newItemsWithColumnIndex: Array<{ item: TItem; columnIndex: number }> = [] | |
const columnsHeights = _.times(columnsCount, () => 0) | |
for (const item of items) { | |
const itemHeight = itemHeights[item.key] || 0 | |
const lowestColumnIndex = _.minBy(_.range(columnsCount), (columnIndex) => columnsHeights[columnIndex]) || 0 | |
columnsHeights[lowestColumnIndex] += itemHeight | |
newItemsWithColumnIndex.push({ item, columnIndex: lowestColumnIndex }) | |
} | |
setItemsWithColumnIndex(newItemsWithColumnIndex) | |
} | |
normalizeItemsWithColumnIndex() | |
}, [items, itemHeights, columnsCount]) | |
return ( | |
<> | |
{_.times(columnsCount, (columnIndex) => { | |
return columnRender({ | |
index: columnIndex, | |
width: columnWidth, | |
children: ( | |
<> | |
{itemsWithColumnIndex.map( | |
(itemWithColumnIndex, itemIndex) => | |
columnIndex === itemWithColumnIndex.columnIndex && ( | |
<Item | |
key={itemWithColumnIndex.item.key} | |
item={itemWithColumnIndex.item} | |
index={itemIndex} | |
itemRender={itemRender} | |
itemHeights={itemHeights} | |
setItemHeights={setItemHeights} | |
/> | |
) | |
)} | |
</> | |
), | |
}) | |
})} | |
</> | |
) | |
} |
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