Function resolveVirtualScrollClampBounds

src/hooks/useVirtualScroll.ts:259–302

({
  clampEnabled,
  liveBounds,
  previousStableBounds,
  reusedPreviousBounds,
}: VirtualScrollClampPersistenceInput)

}

export function resolveVirtualScrollClampBounds({
  clampEnabled,
  liveBounds,
  previousStableBounds,
  reusedPreviousBounds,
}: VirtualScrollClampPersistenceInput): VirtualScrollClampPersistenceResult {
  const emptyBounds = {
    clampMin: undefined,
    clampMax: undefined,
  } satisfies VirtualScrollClampBounds

  if (!clampEnabled) {
    return {
      appliedBounds: emptyBounds,
      nextStableBounds: emptyBounds,
      reusedPreviousBounds: false,
    }
  }

  if (hasVirtualScrollClampBounds(liveBounds)) {
    return {
      appliedBounds: liveBounds,
      nextStableBounds: liveBounds,
      reusedPreviousBounds: false,
    }
  }

  if (
    hasVirtualScrollClampBounds(previousStableBounds) &&
    !reusedPreviousBounds
  ) {
    return {
      appliedBounds: previousStableBounds,
      nextStableBounds: previousStableBounds,
      reusedPreviousBounds: true,
    }
  }

  return {
    appliedBounds: emptyBounds,
    nextStableBounds: emptyBounds,
    reusedPreviousBounds: false,
  }
}

export function computeVirtualScrollOffsets(
  itemKeys: readonly string[],