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perf(tui): lazily seed virtual history heights (#16523)

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kshitij 2026-04-27 07:55:45 -07:00 • committed by GitHub
parent 9b55365f6f
commit 98d75dea5a
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3 changed files with 75 additions and 22 deletions
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29
ui-tui/src/hooks/useVirtualHistory.ts
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@ -76,12 +76,32 @@ export const shouldSetVirtualClamp = ({
viewportHeight: number
}) => itemCount > 0 && viewportHeight > 0 && !sticky && !liveTailActive
export const ensureVirtualItemHeight = (
heights: Map<string, number>,
key: string,
index: number,
estimate: number,
estimateHeight?: (index: number, key: string) => number
) => {
const cached = heights.get(key)
if (cached !== undefined) {
return Math.max(1, Math.floor(cached))
}
const seeded = Math.max(1, Math.floor(estimateHeight?.(index, key) ?? estimate))
heights.set(key, seeded)
return seeded
}
export function useVirtualHistory(
scrollRef: RefObject<ScrollBoxHandle | null>,
items: readonly { key: string }[],
columns: number,
{
estimate = ESTIMATE,
estimateHeight,
initialHeights,
liveTailActive = false,
onHeightsChange,
@ -208,7 +228,7 @@ export function useVirtualHistory(
arr[0] = 0
for (let i = 0; i < n; i++) {
arr[i + 1] = arr[i]! + Math.max(1, Math.floor(heights.current.get(items[i]!.key) ?? estimate))
arr[i + 1] = arr[i]! + ensureVirtualItemHeight(heights.current, items[i]!.key, i, estimate, estimateHeight)
}
offsetsCache.current = { arr, n, version: offsetVersion.current }
@ -280,7 +300,7 @@ export function useVirtualHistory(
let coverage = 0
for (let i = start; i < end; i++) {
coverage += heights.current.get(items[i]!.key) ?? PESSIMISTIC
coverage += ensureVirtualItemHeight(heights.current, items[i]!.key, i, PESSIMISTIC, estimateHeight)
}
if (sticky) {
@ -288,13 +308,13 @@ export function useVirtualHistory(
while (start > minStart && coverage < needed) {
start--
coverage += heights.current.get(items[start]!.key) ?? PESSIMISTIC
coverage += ensureVirtualItemHeight(heights.current, items[start]!.key, start, PESSIMISTIC, estimateHeight)
}
} else {
const maxEnd = Math.min(n, start + maxMounted)
while (end < maxEnd && coverage < needed) {
coverage += heights.current.get(items[end]!.key) ?? PESSIMISTIC
coverage += ensureVirtualItemHeight(heights.current, items[end]!.key, end, PESSIMISTIC, estimateHeight)
end++
}
}
@ -498,6 +518,7 @@ interface MeasuredNode {
interface VirtualHistoryOptions {
coldStartCount?: number
estimate?: number
estimateHeight?: (index: number, key: string) => number
initialHeights?: ReadonlyMap<string, number>
liveTailActive?: boolean
maxMounted?: number