{"version":3,"file":"index.cjs","sources":["../../src/index.ts"],"sourcesContent":["import { approxEqual, memo, notUndefined, debounce } from './utils'\n\nexport * from './utils'\n\n//\n\ntype ScrollDirection = 'forward' | 'backward'\n\ntype ScrollAlignment = 'start' | 'center' | 'end' | 'auto'\n\ntype ScrollBehavior = 'auto' | 'smooth'\n\nexport interface ScrollToOptions {\n align?: ScrollAlignment\n behavior?: ScrollBehavior\n}\n\ntype ScrollToOffsetOptions = ScrollToOptions\n\ntype ScrollToIndexOptions = ScrollToOptions\n\nexport interface Range {\n startIndex: number\n endIndex: number\n overscan: number\n count: number\n}\n\ntype Key = number | string\n\nexport interface VirtualItem {\n key: Key\n index: number\n start: number\n end: number\n size: number\n lane: number\n}\n\nexport interface Rect {\n width: number\n height: number\n}\n\n//\n\nexport const defaultKeyExtractor = (index: number) => index\n\nexport const defaultRangeExtractor = (range: Range) => {\n const start = Math.max(range.startIndex - range.overscan, 0)\n const end = Math.min(range.endIndex + range.overscan, range.count - 1)\n\n const arr = []\n\n for (let i = start; i <= end; i++) {\n arr.push(i)\n }\n\n return arr\n}\n\nexport const observeElementRect = (\n instance: Virtualizer,\n cb: (rect: Rect) => void,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n const targetWindow = instance.targetWindow\n if (!targetWindow) {\n return\n }\n\n const handler = (rect: Rect) => {\n const { width, height } = rect\n cb({ width: Math.round(width), height: Math.round(height) })\n }\n\n handler(element.getBoundingClientRect())\n\n if (!targetWindow.ResizeObserver) {\n return () => {}\n }\n\n const observer = new targetWindow.ResizeObserver((entries) => {\n const entry = entries[0]\n if (entry?.borderBoxSize) {\n const box = entry.borderBoxSize[0]\n if (box) {\n handler({ width: box.inlineSize, height: box.blockSize })\n return\n }\n }\n handler(element.getBoundingClientRect())\n })\n\n observer.observe(element, { box: 'border-box' })\n\n return () => {\n observer.unobserve(element)\n }\n}\n\nconst addEventListenerOptions = {\n passive: true,\n}\n\nexport const observeWindowRect = (\n instance: Virtualizer,\n cb: (rect: Rect) => void,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n\n const handler = () => {\n cb({ width: element.innerWidth, height: element.innerHeight })\n }\n handler()\n\n element.addEventListener('resize', handler, addEventListenerOptions)\n\n return () => {\n element.removeEventListener('resize', handler)\n }\n}\n\nconst supportsScrollend =\n typeof window == 'undefined' ? true : 'onscrollend' in window\n\nexport const observeElementOffset = (\n instance: Virtualizer,\n cb: (offset: number, isScrolling: boolean) => void,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n const targetWindow = instance.targetWindow\n if (!targetWindow) {\n return\n }\n\n let offset = 0\n const fallback = supportsScrollend\n ? () => undefined\n : debounce(\n targetWindow,\n () => {\n cb(offset, false)\n },\n instance.options.isScrollingResetDelay,\n )\n\n const createHandler = (isScrolling: boolean) => () => {\n offset = element[instance.options.horizontal ? 'scrollLeft' : 'scrollTop']\n fallback()\n cb(offset, isScrolling)\n }\n const handler = createHandler(true)\n const endHandler = createHandler(false)\n endHandler()\n\n element.addEventListener('scroll', handler, addEventListenerOptions)\n element.addEventListener('scrollend', endHandler, addEventListenerOptions)\n\n return () => {\n element.removeEventListener('scroll', handler)\n element.removeEventListener('scrollend', endHandler)\n }\n}\n\nexport const observeWindowOffset = (\n instance: Virtualizer,\n cb: (offset: number, isScrolling: boolean) => void,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n const targetWindow = instance.targetWindow\n if (!targetWindow) {\n return\n }\n\n let offset = 0\n const fallback = supportsScrollend\n ? () => undefined\n : debounce(\n targetWindow,\n () => {\n cb(offset, false)\n },\n instance.options.isScrollingResetDelay,\n )\n\n const createHandler = (isScrolling: boolean) => () => {\n offset = element[instance.options.horizontal ? 'scrollX' : 'scrollY']\n fallback()\n cb(offset, isScrolling)\n }\n const handler = createHandler(true)\n const endHandler = createHandler(false)\n endHandler()\n\n element.addEventListener('scroll', handler, addEventListenerOptions)\n element.addEventListener('scrollend', endHandler, addEventListenerOptions)\n\n return () => {\n element.removeEventListener('scroll', handler)\n element.removeEventListener('scrollend', endHandler)\n }\n}\n\nexport const measureElement = (\n element: TItemElement,\n entry: ResizeObserverEntry | undefined,\n instance: Virtualizer,\n) => {\n if (entry?.borderBoxSize) {\n const box = entry.borderBoxSize[0]\n if (box) {\n const size = Math.round(\n box[instance.options.horizontal ? 'inlineSize' : 'blockSize'],\n )\n return size\n }\n }\n return Math.round(\n element.getBoundingClientRect()[\n instance.options.horizontal ? 'width' : 'height'\n ],\n )\n}\n\nexport const windowScroll = (\n offset: number,\n {\n adjustments = 0,\n behavior,\n }: { adjustments?: number; behavior?: ScrollBehavior },\n instance: Virtualizer,\n) => {\n const toOffset = offset + adjustments\n\n instance.scrollElement?.scrollTo?.({\n [instance.options.horizontal ? 'left' : 'top']: toOffset,\n behavior,\n })\n}\n\nexport const elementScroll = (\n offset: number,\n {\n adjustments = 0,\n behavior,\n }: { adjustments?: number; behavior?: ScrollBehavior },\n instance: Virtualizer,\n) => {\n const toOffset = offset + adjustments\n\n instance.scrollElement?.scrollTo?.({\n [instance.options.horizontal ? 'left' : 'top']: toOffset,\n behavior,\n })\n}\n\nexport interface VirtualizerOptions<\n TScrollElement extends Element | Window,\n TItemElement extends Element,\n> {\n // Required from the user\n count: number\n getScrollElement: () => TScrollElement | null\n estimateSize: (index: number) => number\n\n // Required from the framework adapter (but can be overridden)\n scrollToFn: (\n offset: number,\n options: { adjustments?: number; behavior?: ScrollBehavior },\n instance: Virtualizer,\n ) => void\n observeElementRect: (\n instance: Virtualizer,\n cb: (rect: Rect) => void,\n ) => void | (() => void)\n observeElementOffset: (\n instance: Virtualizer,\n cb: (offset: number, isScrolling: boolean) => void,\n ) => void | (() => void)\n\n // Optional\n debug?: any\n initialRect?: Rect\n onChange?: (\n instance: Virtualizer,\n sync: boolean,\n ) => void\n measureElement?: (\n element: TItemElement,\n entry: ResizeObserverEntry | undefined,\n instance: Virtualizer,\n ) => number\n overscan?: number\n horizontal?: boolean\n paddingStart?: number\n paddingEnd?: number\n scrollPaddingStart?: number\n scrollPaddingEnd?: number\n initialOffset?: number | (() => number)\n getItemKey?: (index: number) => Key\n rangeExtractor?: (range: Range) => number[]\n scrollMargin?: number\n gap?: number\n indexAttribute?: string\n initialMeasurementsCache?: VirtualItem[]\n lanes?: number\n isScrollingResetDelay?: number\n}\n\nexport class Virtualizer<\n TScrollElement extends Element | Window,\n TItemElement extends Element,\n> {\n private unsubs: (void | (() => void))[] = []\n options!: Required>\n scrollElement: TScrollElement | null = null\n targetWindow: (Window & typeof globalThis) | null = null\n isScrolling: boolean = false\n private scrollToIndexTimeoutId: number | null = null\n measurementsCache: VirtualItem[] = []\n private itemSizeCache = new Map()\n private pendingMeasuredCacheIndexes: number[] = []\n scrollRect: Rect\n scrollOffset: number\n scrollDirection: ScrollDirection | null = null\n private scrollAdjustments: number = 0\n shouldAdjustScrollPositionOnItemSizeChange:\n | undefined\n | ((\n item: VirtualItem,\n delta: number,\n instance: Virtualizer,\n ) => boolean)\n measureElementCache = new Map()\n private observer = (() => {\n let _ro: ResizeObserver | null = null\n\n const get = () => {\n if (_ro) {\n return _ro\n }\n\n if (!this.targetWindow || !this.targetWindow.ResizeObserver) {\n return null\n }\n\n return (_ro = new this.targetWindow.ResizeObserver((entries) => {\n entries.forEach((entry) => {\n this._measureElement(entry.target as TItemElement, entry)\n })\n }))\n }\n\n return {\n disconnect: () => get()?.disconnect(),\n observe: (target: Element) =>\n get()?.observe(target, { box: 'border-box' }),\n unobserve: (target: Element) => get()?.unobserve(target),\n }\n })()\n range: { startIndex: number; endIndex: number } | null = null\n\n constructor(opts: VirtualizerOptions) {\n this.setOptions(opts)\n this.scrollRect = this.options.initialRect\n this.scrollOffset =\n typeof this.options.initialOffset === 'function'\n ? this.options.initialOffset()\n : this.options.initialOffset\n this.measurementsCache = this.options.initialMeasurementsCache\n this.measurementsCache.forEach((item) => {\n this.itemSizeCache.set(item.key, item.size)\n })\n\n this.notify(false, false)\n }\n\n setOptions = (opts: VirtualizerOptions) => {\n Object.entries(opts).forEach(([key, value]) => {\n if (typeof value === 'undefined') delete (opts as any)[key]\n })\n\n this.options = {\n debug: false,\n initialOffset: 0,\n overscan: 1,\n paddingStart: 0,\n paddingEnd: 0,\n scrollPaddingStart: 0,\n scrollPaddingEnd: 0,\n horizontal: false,\n getItemKey: defaultKeyExtractor,\n rangeExtractor: defaultRangeExtractor,\n onChange: () => {},\n measureElement,\n initialRect: { width: 0, height: 0 },\n scrollMargin: 0,\n gap: 0,\n indexAttribute: 'data-index',\n initialMeasurementsCache: [],\n lanes: 1,\n isScrollingResetDelay: 150,\n ...opts,\n }\n }\n\n private notify = (force: boolean, sync: boolean) => {\n const { startIndex, endIndex } = this.range ?? {\n startIndex: undefined,\n endIndex: undefined,\n }\n const range = this.calculateRange()\n\n if (\n force ||\n startIndex !== range?.startIndex ||\n endIndex !== range?.endIndex\n ) {\n this.options.onChange?.(this, sync)\n }\n }\n\n private cleanup = () => {\n this.unsubs.filter(Boolean).forEach((d) => d!())\n this.unsubs = []\n this.scrollElement = null\n }\n\n _didMount = () => {\n this.measureElementCache.forEach(this.observer.observe)\n return () => {\n this.observer.disconnect()\n this.cleanup()\n }\n }\n\n _willUpdate = () => {\n const scrollElement = this.options.getScrollElement()\n\n if (this.scrollElement !== scrollElement) {\n this.cleanup()\n\n this.scrollElement = scrollElement\n\n if (this.scrollElement && 'ownerDocument' in this.scrollElement) {\n this.targetWindow = this.scrollElement.ownerDocument.defaultView\n } else {\n this.targetWindow = this.scrollElement?.window ?? null\n }\n\n this._scrollToOffset(this.scrollOffset, {\n adjustments: undefined,\n behavior: undefined,\n })\n\n this.unsubs.push(\n this.options.observeElementRect(this, (rect) => {\n this.scrollRect = rect\n this.notify(false, false)\n }),\n )\n\n this.unsubs.push(\n this.options.observeElementOffset(this, (offset, isScrolling) => {\n this.scrollAdjustments = 0\n this.scrollDirection = isScrolling\n ? this.scrollOffset < offset\n ? 'forward'\n : 'backward'\n : null\n this.scrollOffset = offset\n\n const prevIsScrolling = this.isScrolling\n this.isScrolling = isScrolling\n\n this.notify(prevIsScrolling !== isScrolling, isScrolling)\n }),\n )\n }\n }\n\n private getSize = () => {\n return this.scrollRect[this.options.horizontal ? 'width' : 'height']\n }\n\n private getMeasurementOptions = memo(\n () => [\n this.options.count,\n this.options.paddingStart,\n this.options.scrollMargin,\n this.options.getItemKey,\n ],\n (count, paddingStart, scrollMargin, getItemKey) => {\n this.pendingMeasuredCacheIndexes = []\n return {\n count,\n paddingStart,\n scrollMargin,\n getItemKey,\n }\n },\n {\n key: false,\n },\n )\n\n private getFurthestMeasurement = (\n measurements: VirtualItem[],\n index: number,\n ) => {\n const furthestMeasurementsFound = new Map()\n const furthestMeasurements = new Map()\n for (let m = index - 1; m >= 0; m--) {\n const measurement = measurements[m]!\n\n if (furthestMeasurementsFound.has(measurement.lane)) {\n continue\n }\n\n const previousFurthestMeasurement = furthestMeasurements.get(\n measurement.lane,\n )\n if (\n previousFurthestMeasurement == null ||\n measurement.end > previousFurthestMeasurement.end\n ) {\n furthestMeasurements.set(measurement.lane, measurement)\n } else if (measurement.end < previousFurthestMeasurement.end) {\n furthestMeasurementsFound.set(measurement.lane, true)\n }\n\n if (furthestMeasurementsFound.size === this.options.lanes) {\n break\n }\n }\n\n return furthestMeasurements.size === this.options.lanes\n ? Array.from(furthestMeasurements.values()).sort((a, b) => {\n if (a.end === b.end) {\n return a.index - b.index\n }\n\n return a.end - b.end\n })[0]\n : undefined\n }\n\n private getMeasurements = memo(\n () => [this.getMeasurementOptions(), this.itemSizeCache],\n ({ count, paddingStart, scrollMargin, getItemKey }, itemSizeCache) => {\n const min =\n this.pendingMeasuredCacheIndexes.length > 0\n ? Math.min(...this.pendingMeasuredCacheIndexes)\n : 0\n this.pendingMeasuredCacheIndexes = []\n\n const measurements = this.measurementsCache.slice(0, min)\n\n for (let i = min; i < count; i++) {\n const key = getItemKey(i)\n\n const furthestMeasurement =\n this.options.lanes === 1\n ? measurements[i - 1]\n : this.getFurthestMeasurement(measurements, i)\n\n const start = furthestMeasurement\n ? furthestMeasurement.end + this.options.gap\n : paddingStart + scrollMargin\n\n const measuredSize = itemSizeCache.get(key)\n const size =\n typeof measuredSize === 'number'\n ? measuredSize\n : this.options.estimateSize(i)\n\n const end = start + size\n\n const lane = furthestMeasurement\n ? furthestMeasurement.lane\n : i % this.options.lanes\n\n measurements[i] = {\n index: i,\n start,\n size,\n end,\n key,\n lane,\n }\n }\n\n this.measurementsCache = measurements\n\n return measurements\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'getMeasurements',\n debug: () => this.options.debug,\n },\n )\n\n calculateRange = memo(\n () => [this.getMeasurements(), this.getSize(), this.scrollOffset],\n (measurements, outerSize, scrollOffset) => {\n return (this.range =\n measurements.length > 0 && outerSize > 0\n ? calculateRange({\n measurements,\n outerSize,\n scrollOffset,\n })\n : null)\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'calculateRange',\n debug: () => this.options.debug,\n },\n )\n\n private getIndexes = memo(\n () => [\n this.options.rangeExtractor,\n this.calculateRange(),\n this.options.overscan,\n this.options.count,\n ],\n (rangeExtractor, range, overscan, count) => {\n return range === null\n ? []\n : rangeExtractor({\n startIndex: range.startIndex,\n endIndex: range.endIndex,\n overscan,\n count,\n })\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'getIndexes',\n debug: () => this.options.debug,\n },\n )\n\n indexFromElement = (node: TItemElement) => {\n const attributeName = this.options.indexAttribute\n const indexStr = node.getAttribute(attributeName)\n\n if (!indexStr) {\n console.warn(\n `Missing attribute name '${attributeName}={index}' on measured element.`,\n )\n return -1\n }\n\n return parseInt(indexStr, 10)\n }\n\n private _measureElement = (\n node: TItemElement,\n entry: ResizeObserverEntry | undefined,\n ) => {\n const item = this.measurementsCache[this.indexFromElement(node)]\n\n if (!item || !node.isConnected) {\n this.measureElementCache.forEach((cached, key) => {\n if (cached === node) {\n this.observer.unobserve(node)\n this.measureElementCache.delete(key)\n }\n })\n return\n }\n\n const prevNode = this.measureElementCache.get(item.key)\n\n if (prevNode !== node) {\n if (prevNode) {\n this.observer.unobserve(prevNode)\n }\n this.observer.observe(node)\n this.measureElementCache.set(item.key, node)\n }\n\n const measuredItemSize = this.options.measureElement(node, entry, this)\n\n this.resizeItem(item, measuredItemSize)\n }\n\n resizeItem = (item: VirtualItem, size: number) => {\n const itemSize = this.itemSizeCache.get(item.key) ?? item.size\n const delta = size - itemSize\n\n if (delta !== 0) {\n if (\n this.shouldAdjustScrollPositionOnItemSizeChange !== undefined\n ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this)\n : item.start < this.scrollOffset + this.scrollAdjustments\n ) {\n if (process.env.NODE_ENV !== 'production' && this.options.debug) {\n console.info('correction', delta)\n }\n\n this._scrollToOffset(this.scrollOffset, {\n adjustments: (this.scrollAdjustments += delta),\n behavior: undefined,\n })\n }\n\n this.pendingMeasuredCacheIndexes.push(item.index)\n this.itemSizeCache = new Map(this.itemSizeCache.set(item.key, size))\n\n this.notify(true, false)\n }\n }\n\n measureElement = (node: TItemElement | null) => {\n if (!node) {\n return\n }\n\n this._measureElement(node, undefined)\n }\n\n getVirtualItems = memo(\n () => [this.getIndexes(), this.getMeasurements()],\n (indexes, measurements) => {\n const virtualItems: VirtualItem[] = []\n\n for (let k = 0, len = indexes.length; k < len; k++) {\n const i = indexes[k]!\n const measurement = measurements[i]!\n\n virtualItems.push(measurement)\n }\n\n return virtualItems\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'getIndexes',\n debug: () => this.options.debug,\n },\n )\n\n getVirtualItemForOffset = (offset: number) => {\n const measurements = this.getMeasurements()\n\n return notUndefined(\n measurements[\n findNearestBinarySearch(\n 0,\n measurements.length - 1,\n (index: number) => notUndefined(measurements[index]).start,\n offset,\n )\n ],\n )\n }\n\n getOffsetForAlignment = (toOffset: number, align: ScrollAlignment) => {\n const size = this.getSize()\n\n if (align === 'auto') {\n if (toOffset <= this.scrollOffset) {\n align = 'start'\n } else if (toOffset >= this.scrollOffset + size) {\n align = 'end'\n } else {\n align = 'start'\n }\n }\n\n if (align === 'start') {\n toOffset = toOffset\n } else if (align === 'end') {\n toOffset = toOffset - size\n } else if (align === 'center') {\n toOffset = toOffset - size / 2\n }\n\n const scrollSizeProp = this.options.horizontal\n ? 'scrollWidth'\n : 'scrollHeight'\n const scrollSize = this.scrollElement\n ? 'document' in this.scrollElement\n ? this.scrollElement.document.documentElement[scrollSizeProp]\n : this.scrollElement[scrollSizeProp]\n : 0\n\n const maxOffset = scrollSize - this.getSize()\n\n return Math.max(Math.min(maxOffset, toOffset), 0)\n }\n\n getOffsetForIndex = (index: number, align: ScrollAlignment = 'auto') => {\n index = Math.max(0, Math.min(index, this.options.count - 1))\n\n const measurement = notUndefined(this.getMeasurements()[index])\n\n if (align === 'auto') {\n if (\n measurement.end >=\n this.scrollOffset + this.getSize() - this.options.scrollPaddingEnd\n ) {\n align = 'end'\n } else if (\n measurement.start <=\n this.scrollOffset + this.options.scrollPaddingStart\n ) {\n align = 'start'\n } else {\n return [this.scrollOffset, align] as const\n }\n }\n\n const toOffset =\n align === 'end'\n ? measurement.end + this.options.scrollPaddingEnd\n : measurement.start - this.options.scrollPaddingStart\n\n return [this.getOffsetForAlignment(toOffset, align), align] as const\n }\n\n private isDynamicMode = () => this.measureElementCache.size > 0\n\n private cancelScrollToIndex = () => {\n if (this.scrollToIndexTimeoutId !== null && this.targetWindow) {\n this.targetWindow.clearTimeout(this.scrollToIndexTimeoutId)\n this.scrollToIndexTimeoutId = null\n }\n }\n\n scrollToOffset = (\n toOffset: number,\n { align = 'start', behavior }: ScrollToOffsetOptions = {},\n ) => {\n this.cancelScrollToIndex()\n\n if (behavior === 'smooth' && this.isDynamicMode()) {\n console.warn(\n 'The `smooth` scroll behavior is not fully supported with dynamic size.',\n )\n }\n\n this._scrollToOffset(this.getOffsetForAlignment(toOffset, align), {\n adjustments: undefined,\n behavior,\n })\n }\n\n scrollToIndex = (\n index: number,\n { align: initialAlign = 'auto', behavior }: ScrollToIndexOptions = {},\n ) => {\n index = Math.max(0, Math.min(index, this.options.count - 1))\n\n this.cancelScrollToIndex()\n\n if (behavior === 'smooth' && this.isDynamicMode()) {\n console.warn(\n 'The `smooth` scroll behavior is not fully supported with dynamic size.',\n )\n }\n\n const [toOffset, align] = this.getOffsetForIndex(index, initialAlign)\n\n this._scrollToOffset(toOffset, { adjustments: undefined, behavior })\n\n if (behavior !== 'smooth' && this.isDynamicMode() && this.targetWindow) {\n this.scrollToIndexTimeoutId = this.targetWindow.setTimeout(() => {\n this.scrollToIndexTimeoutId = null\n\n const elementInDOM = this.measureElementCache.has(\n this.options.getItemKey(index),\n )\n\n if (elementInDOM) {\n const [toOffset] = this.getOffsetForIndex(index, align)\n\n if (!approxEqual(toOffset, this.scrollOffset)) {\n this.scrollToIndex(index, { align, behavior })\n }\n } else {\n this.scrollToIndex(index, { align, behavior })\n }\n })\n }\n }\n\n scrollBy = (delta: number, { behavior }: ScrollToOffsetOptions = {}) => {\n this.cancelScrollToIndex()\n\n if (behavior === 'smooth' && this.isDynamicMode()) {\n console.warn(\n 'The `smooth` scroll behavior is not fully supported with dynamic size.',\n )\n }\n\n this._scrollToOffset(this.scrollOffset + delta, {\n adjustments: undefined,\n behavior,\n })\n }\n\n getTotalSize = () => {\n const measurements = this.getMeasurements()\n\n let end: number\n // If there are no measurements, set the end to paddingStart\n if (measurements.length === 0) {\n end = this.options.paddingStart\n } else {\n // If lanes is 1, use the last measurement's end, otherwise find the maximum end value among all measurements\n end =\n this.options.lanes === 1\n ? measurements[measurements.length - 1]?.end ?? 0\n : Math.max(\n ...measurements.slice(-this.options.lanes).map((m) => m.end),\n )\n }\n\n return end - this.options.scrollMargin + this.options.paddingEnd\n }\n\n private _scrollToOffset = (\n offset: number,\n {\n adjustments,\n behavior,\n }: {\n adjustments: number | undefined\n behavior: ScrollBehavior | undefined\n },\n ) => {\n this.options.scrollToFn(offset, { behavior, adjustments }, this)\n }\n\n measure = () => {\n this.itemSizeCache = new Map()\n this.options.onChange?.(this, false)\n }\n}\n\nconst findNearestBinarySearch = (\n low: number,\n high: number,\n getCurrentValue: (i: number) => number,\n value: number,\n) => {\n while (low <= high) {\n const middle = ((low + high) / 2) | 0\n const currentValue = getCurrentValue(middle)\n\n if (currentValue < value) {\n low = middle + 1\n } else if (currentValue > value) {\n high = middle - 1\n } else {\n return middle\n }\n }\n\n if (low > 0) {\n return low - 1\n } else {\n return 0\n }\n}\n\nfunction calculateRange({\n measurements,\n outerSize,\n scrollOffset,\n}: {\n measurements: VirtualItem[]\n outerSize: number\n scrollOffset: number\n}) {\n const count = measurements.length - 1\n const getOffset = (index: number) => measurements[index]!.start\n\n const startIndex = findNearestBinarySearch(0, count, getOffset, scrollOffset)\n let endIndex = startIndex\n\n while (\n endIndex < count &&\n measurements[endIndex]!.end < scrollOffset + outerSize\n ) {\n endIndex++\n }\n\n return { startIndex, endIndex 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