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{"version":3,"file":"index.esm.js","sources":["../src/timer.js","../src/domHelpers.js","../src/createGridComponent.js","../src/VariableSizeGrid.js","../src/createListComponent.js","../src/VariableSizeList.js","../src/FixedSizeGrid.js","../src/FixedSizeList.js","../src/shallowDiffers.js","../src/areEqual.js","../src/shouldComponentUpdate.js"],"sourcesContent":["// @flow\n\n// Animation frame based implementation of setTimeout.\n// Inspired by Joe Lambert, https://gist.github.com/joelambert/1002116#file-requesttimeout-js\n\nconst hasNativePerformanceNow =\n typeof performance === 'object' && typeof performance.now === 'function';\n\nconst now = hasNativePerformanceNow\n ? () => performance.now()\n : () => Date.now();\n\nexport type TimeoutID = {|\n id: AnimationFrameID,\n|};\n\nexport function cancelTimeout(timeoutID: TimeoutID) {\n cancelAnimationFrame(timeoutID.id);\n}\n\nexport function requestTimeout(callback: Function, delay: number): TimeoutID {\n const start = now();\n\n function tick() {\n if (now() - start >= delay) {\n callback.call(null);\n } else {\n timeoutID.id = requestAnimationFrame(tick);\n }\n }\n\n const timeoutID: TimeoutID = {\n id: requestAnimationFrame(tick),\n };\n\n return timeoutID;\n}\n","// @flow\n\nlet size: number = -1;\n\n// This utility copied from \"dom-helpers\" package.\nexport function getScrollbarSize(recalculate?: boolean = false): number {\n if (size === -1 || recalculate) {\n const div = document.createElement('div');\n const style = div.style;\n style.width = '50px';\n style.height = '50px';\n style.overflow = 'scroll';\n\n ((document.body: any): HTMLBodyElement).appendChild(div);\n\n size = div.offsetWidth - div.clientWidth;\n\n ((document.body: any): HTMLBodyElement).removeChild(div);\n }\n\n return size;\n}\n\nexport type RTLOffsetType =\n | 'negative'\n | 'positive-descending'\n | 'positive-ascending';\n\nlet cachedRTLResult: RTLOffsetType | null = null;\n\n// TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n// Chrome does not seem to adhere; its scrollLeft values are positive (measured relative to the left).\n// Safari's elastic bounce makes detecting this even more complicated wrt potential false positives.\n// The safest way to check this is to intentionally set a negative offset,\n// and then verify that the subsequent \"scroll\" event matches the negative offset.\n// If it does not match, then we can assume a non-standard RTL scroll implementation.\nexport function getRTLOffsetType(recalculate?: boolean = false): RTLOffsetType {\n if (cachedRTLResult === null || recalculate) {\n const outerDiv = document.createElement('div');\n const outerStyle = outerDiv.style;\n outerStyle.width = '50px';\n outerStyle.height = '50px';\n outerStyle.overflow = 'scroll';\n outerStyle.direction = 'rtl';\n\n const innerDiv = document.createElement('div');\n const innerStyle = innerDiv.style;\n innerStyle.width = '100px';\n innerStyle.height = '100px';\n\n outerDiv.appendChild(innerDiv);\n\n ((document.body: any): HTMLBodyElement).appendChild(outerDiv);\n\n if (outerDiv.scrollLeft > 0) {\n cachedRTLResult = 'positive-descending';\n } else {\n outerDiv.scrollLeft = 1;\n if (outerDiv.scrollLeft === 0) {\n cachedRTLResult = 'negative';\n } else {\n cachedRTLResult = 'positive-ascending';\n }\n }\n\n ((document.body: any): HTMLBodyElement).removeChild(outerDiv);\n\n return cachedRTLResult;\n }\n\n return cachedRTLResult;\n}\n","// @flow\n\nimport memoizeOne from 'memoize-one';\nimport { createElement, PureComponent } from 'react';\nimport { cancelTimeout, requestTimeout } from './timer';\nimport { getScrollbarSize, getRTLOffsetType } from './domHelpers';\n\nimport type { TimeoutID } from './timer';\n\ntype Direction = 'ltr' | 'rtl';\nexport type ScrollToAlign = 'auto' | 'smart' | 'center' | 'start' | 'end';\n\ntype itemSize = number | ((index: number) => number);\n\ntype RenderComponentProps<T> = {|\n columnIndex: number,\n data: T,\n isScrolling?: boolean,\n rowIndex: number,\n style: Object,\n|};\nexport type RenderComponent<T> = React$ComponentType<\n $Shape<RenderComponentProps<T>>\n>;\n\ntype ScrollDirection = 'forward' | 'backward';\n\ntype OnItemsRenderedCallback = ({\n overscanColumnStartIndex: number,\n overscanColumnStopIndex: number,\n overscanRowStartIndex: number,\n overscanRowStopIndex: number,\n visibleColumnStartIndex: number,\n visibleColumnStopIndex: number,\n visibleRowStartIndex: number,\n visibleRowStopIndex: number,\n}) => void;\ntype OnScrollCallback = ({\n horizontalScrollDirection: ScrollDirection,\n scrollLeft: number,\n scrollTop: number,\n scrollUpdateWasRequested: boolean,\n verticalScrollDirection: ScrollDirection,\n}) => void;\n\ntype ScrollEvent = SyntheticEvent<HTMLDivElement>;\ntype ItemStyleCache = { [key: string]: Object };\n\ntype OuterProps = {|\n children: React$Node,\n className: string | void,\n onScroll: ScrollEvent => void,\n style: {\n [string]: mixed,\n },\n|};\n\ntype InnerProps = {|\n children: React$Node,\n style: {\n [string]: mixed,\n },\n|};\n\nexport type Props<T> = {|\n children: RenderComponent<T>,\n className?: string,\n columnCount: number,\n columnWidth: itemSize,\n direction: Direction,\n height: number,\n initialScrollLeft?: number,\n initialScrollTop?: number,\n innerRef?: any,\n innerElementType?: string | React$AbstractComponent<InnerProps, any>,\n innerTagName?: string, // deprecated\n itemData: T,\n itemKey?: (params: {|\n columnIndex: number,\n data: T,\n rowIndex: number,\n |}) => any,\n onItemsRendered?: OnItemsRenderedCallback,\n onScroll?: OnScrollCallback,\n outerRef?: any,\n outerElementType?: string | React$AbstractComponent<OuterProps, any>,\n outerTagName?: string, // deprecated\n overscanColumnCount?: number,\n overscanColumnsCount?: number, // deprecated\n overscanCount?: number, // deprecated\n overscanRowCount?: number,\n overscanRowsCount?: number, // deprecated\n rowCount: number,\n rowHeight: itemSize,\n style?: Object,\n useIsScrolling: boolean,\n width: number,\n|};\n\ntype State = {|\n instance: any,\n isScrolling: boolean,\n horizontalScrollDirection: ScrollDirection,\n scrollLeft: number,\n scrollTop: number,\n scrollUpdateWasRequested: boolean,\n verticalScrollDirection: ScrollDirection,\n|};\n\ntype getItemOffset = (\n props: Props<any>,\n index: number,\n instanceProps: any\n) => number;\ntype getItemSize = (\n props: Props<any>,\n index: number,\n instanceProps: any\n) => number;\ntype getEstimatedTotalSize = (props: Props<any>, instanceProps: any) => number;\ntype GetOffsetForItemAndAlignment = (\n props: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: any,\n scrollbarSize: number\n) => number;\ntype GetStartIndexForOffset = (\n props: Props<any>,\n offset: number,\n instanceProps: any\n) => number;\ntype GetStopIndexForStartIndex = (\n props: Props<any>,\n startIndex: number,\n scrollOffset: number,\n instanceProps: any\n) => number;\ntype InitInstanceProps = (props: Props<any>, instance: any) => any;\ntype ValidateProps = (props: Props<any>) => void;\n\nconst IS_SCROLLING_DEBOUNCE_INTERVAL = 150;\n\nconst defaultItemKey = ({ columnIndex, data, rowIndex }) =>\n `${rowIndex}:${columnIndex}`;\n\n// In DEV mode, this Set helps us only log a warning once per component instance.\n// This avoids spamming the console every time a render happens.\nlet devWarningsOverscanCount = null;\nlet devWarningsOverscanRowsColumnsCount = null;\nlet devWarningsTagName = null;\nif (process.env.NODE_ENV !== 'production') {\n if (typeof window !== 'undefined' && typeof window.WeakSet !== 'undefined') {\n devWarningsOverscanCount = new WeakSet();\n devWarningsOverscanRowsColumnsCount = new WeakSet();\n devWarningsTagName = new WeakSet();\n }\n}\n\nexport default function createGridComponent({\n getColumnOffset,\n getColumnStartIndexForOffset,\n getColumnStopIndexForStartIndex,\n getColumnWidth,\n getEstimatedTotalHeight,\n getEstimatedTotalWidth,\n getOffsetForColumnAndAlignment,\n getOffsetForRowAndAlignment,\n getRowHeight,\n getRowOffset,\n getRowStartIndexForOffset,\n getRowStopIndexForStartIndex,\n initInstanceProps,\n shouldResetStyleCacheOnItemSizeChange,\n validateProps,\n}: {|\n getColumnOffset: getItemOffset,\n getColumnStartIndexForOffset: GetStartIndexForOffset,\n getColumnStopIndexForStartIndex: GetStopIndexForStartIndex,\n getColumnWidth: getItemSize,\n getEstimatedTotalHeight: getEstimatedTotalSize,\n getEstimatedTotalWidth: getEstimatedTotalSize,\n getOffsetForColumnAndAlignment: GetOffsetForItemAndAlignment,\n getOffsetForRowAndAlignment: GetOffsetForItemAndAlignment,\n getRowOffset: getItemOffset,\n getRowHeight: getItemSize,\n getRowStartIndexForOffset: GetStartIndexForOffset,\n getRowStopIndexForStartIndex: GetStopIndexForStartIndex,\n initInstanceProps: InitInstanceProps,\n shouldResetStyleCacheOnItemSizeChange: boolean,\n validateProps: ValidateProps,\n|}) {\n return class Grid<T> extends PureComponent<Props<T>, State> {\n _instanceProps: any = initInstanceProps(this.props, this);\n _resetIsScrollingTimeoutId: TimeoutID | null = null;\n _outerRef: ?HTMLDivElement;\n\n static defaultProps = {\n direction: 'ltr',\n itemData: undefined,\n useIsScrolling: false,\n };\n\n state: State = {\n instance: this,\n isScrolling: false,\n horizontalScrollDirection: 'forward',\n scrollLeft:\n typeof this.props.initialScrollLeft === 'number'\n ? this.props.initialScrollLeft\n : 0,\n scrollTop:\n typeof this.props.initialScrollTop === 'number'\n ? this.props.initialScrollTop\n : 0,\n scrollUpdateWasRequested: false,\n verticalScrollDirection: 'forward',\n };\n\n // Always use explicit constructor for React components.\n // It produces less code after transpilation. (#26)\n // eslint-disable-next-line no-useless-constructor\n constructor(props: Props<T>) {\n super(props);\n }\n\n static getDerivedStateFromProps(\n nextProps: Props<T>,\n prevState: State\n ): $Shape<State> | null {\n validateSharedProps(nextProps, prevState);\n validateProps(nextProps);\n return null;\n }\n\n scrollTo({\n scrollLeft,\n scrollTop,\n }: {\n scrollLeft: number,\n scrollTop: number,\n }): void {\n if (scrollLeft !== undefined) {\n scrollLeft = Math.max(0, scrollLeft);\n }\n if (scrollTop !== undefined) {\n scrollTop = Math.max(0, scrollTop);\n }\n\n this.setState(prevState => {\n if (scrollLeft === undefined) {\n scrollLeft = prevState.scrollLeft;\n }\n if (scrollTop === undefined) {\n scrollTop = prevState.scrollTop;\n }\n\n if (\n prevState.scrollLeft === scrollLeft &&\n prevState.scrollTop === scrollTop\n ) {\n return null;\n }\n\n return {\n horizontalScrollDirection:\n prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',\n scrollLeft: scrollLeft,\n scrollTop: scrollTop,\n scrollUpdateWasRequested: true,\n verticalScrollDirection:\n prevState.scrollTop < scrollTop ? 'forward' : 'backward',\n };\n }, this._resetIsScrollingDebounced);\n }\n\n scrollToItem({\n align = 'auto',\n columnIndex,\n rowIndex,\n }: {\n align: ScrollToAlign,\n columnIndex?: number,\n rowIndex?: number,\n }): void {\n const { columnCount, height, rowCount, width } = this.props;\n const { scrollLeft, scrollTop } = this.state;\n const scrollbarSize = getScrollbarSize();\n\n if (columnIndex !== undefined) {\n columnIndex = Math.max(0, Math.min(columnIndex, columnCount - 1));\n }\n if (rowIndex !== undefined) {\n rowIndex = Math.max(0, Math.min(rowIndex, rowCount - 1));\n }\n\n const estimatedTotalHeight = getEstimatedTotalHeight(\n this.props,\n this._instanceProps\n );\n const estimatedTotalWidth = getEstimatedTotalWidth(\n this.props,\n this._instanceProps\n );\n\n // The scrollbar size should be considered when scrolling an item into view,\n // to ensure it's fully visible.\n // But we only need to account for its size when it's actually visible.\n const horizontalScrollbarSize =\n estimatedTotalWidth > width ? scrollbarSize : 0;\n const verticalScrollbarSize =\n estimatedTotalHeight > height ? scrollbarSize : 0;\n\n this.scrollTo({\n scrollLeft:\n columnIndex !== undefined\n ? getOffsetForColumnAndAlignment(\n this.props,\n columnIndex,\n align,\n scrollLeft,\n this._instanceProps,\n verticalScrollbarSize\n )\n : scrollLeft,\n scrollTop:\n rowIndex !== undefined\n ? getOffsetForRowAndAlignment(\n this.props,\n rowIndex,\n align,\n scrollTop,\n this._instanceProps,\n horizontalScrollbarSize\n )\n : scrollTop,\n });\n }\n\n componentDidMount() {\n const { initialScrollLeft, initialScrollTop } = this.props;\n\n if (this._outerRef != null) {\n const outerRef = ((this._outerRef: any): HTMLElement);\n if (typeof initialScrollLeft === 'number') {\n outerRef.scrollLeft = initialScrollLeft;\n }\n if (typeof initialScrollTop === 'number') {\n outerRef.scrollTop = initialScrollTop;\n }\n }\n\n this._callPropsCallbacks();\n }\n\n componentDidUpdate() {\n const { direction } = this.props;\n const { scrollLeft, scrollTop, scrollUpdateWasRequested } = this.state;\n\n if (scrollUpdateWasRequested && this._outerRef != null) {\n // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n // So we need to determine which browser behavior we're dealing with, and mimic it.\n const outerRef = ((this._outerRef: any): HTMLElement);\n if (direction === 'rtl') {\n switch (getRTLOffsetType()) {\n case 'negative':\n outerRef.scrollLeft = -scrollLeft;\n break;\n case 'positive-ascending':\n outerRef.scrollLeft = scrollLeft;\n break;\n default:\n const { clientWidth, scrollWidth } = outerRef;\n outerRef.scrollLeft = scrollWidth - clientWidth - scrollLeft;\n break;\n }\n } else {\n outerRef.scrollLeft = Math.max(0, scrollLeft);\n }\n\n outerRef.scrollTop = Math.max(0, scrollTop);\n }\n\n this._callPropsCallbacks();\n }\n\n componentWillUnmount() {\n if (this._resetIsScrollingTimeoutId !== null) {\n cancelTimeout(this._resetIsScrollingTimeoutId);\n }\n }\n\n render() {\n const {\n children,\n className,\n columnCount,\n direction,\n height,\n innerRef,\n innerElementType,\n innerTagName,\n itemData,\n itemKey = defaultItemKey,\n outerElementType,\n outerTagName,\n rowCount,\n style,\n useIsScrolling,\n width,\n } = this.props;\n const { isScrolling } = this.state;\n\n const [\n columnStartIndex,\n columnStopIndex,\n ] = this._getHorizontalRangeToRender();\n const [rowStartIndex, rowStopIndex] = this._getVerticalRangeToRender();\n\n const items = [];\n if (columnCount > 0 && rowCount) {\n for (\n let rowIndex = rowStartIndex;\n rowIndex <= rowStopIndex;\n rowIndex++\n ) {\n for (\n let columnIndex = columnStartIndex;\n columnIndex <= columnStopIndex;\n columnIndex++\n ) {\n items.push(\n createElement(children, {\n columnIndex,\n data: itemData,\n isScrolling: useIsScrolling ? isScrolling : undefined,\n key: itemKey({ columnIndex, data: itemData, rowIndex }),\n rowIndex,\n style: this._getItemStyle(rowIndex, columnIndex),\n })\n );\n }\n }\n }\n\n // Read this value AFTER items have been created,\n // So their actual sizes (if variable) are taken into consideration.\n const estimatedTotalHeight = getEstimatedTotalHeight(\n this.props,\n this._instanceProps\n );\n const estimatedTotalWidth = getEstimatedTotalWidth(\n this.props,\n this._instanceProps\n );\n\n return createElement(\n outerElementType || outerTagName || 'div',\n {\n className,\n onScroll: this._onScroll,\n ref: this._outerRefSetter,\n style: {\n position: 'relative',\n height,\n width,\n overflow: 'auto',\n WebkitOverflowScrolling: 'touch',\n willChange: 'transform',\n direction,\n ...style,\n },\n },\n createElement(innerElementType || innerTagName || 'div', {\n children: items,\n ref: innerRef,\n style: {\n height: estimatedTotalHeight,\n pointerEvents: isScrolling ? 'none' : undefined,\n width: estimatedTotalWidth,\n },\n })\n );\n }\n\n _callOnItemsRendered: (\n overscanColumnStartIndex: number,\n overscanColumnStopIndex: number,\n overscanRowStartIndex: number,\n overscanRowStopIndex: number,\n visibleColumnStartIndex: number,\n visibleColumnStopIndex: number,\n visibleRowStartIndex: number,\n visibleRowStopIndex: number\n ) => void;\n _callOnItemsRendered = memoizeOne(\n (\n overscanColumnStartIndex: number,\n overscanColumnStopIndex: number,\n overscanRowStartIndex: number,\n overscanRowStopIndex: number,\n visibleColumnStartIndex: number,\n visibleColumnStopIndex: number,\n visibleRowStartIndex: number,\n visibleRowStopIndex: number\n ) =>\n ((this.props.onItemsRendered: any): OnItemsRenderedCallback)({\n overscanColumnStartIndex,\n overscanColumnStopIndex,\n overscanRowStartIndex,\n overscanRowStopIndex,\n visibleColumnStartIndex,\n visibleColumnStopIndex,\n visibleRowStartIndex,\n visibleRowStopIndex,\n })\n );\n\n _callOnScroll: (\n scrollLeft: number,\n scrollTop: number,\n horizontalScrollDirection: ScrollDirection,\n verticalScrollDirection: ScrollDirection,\n scrollUpdateWasRequested: boolean\n ) => void;\n _callOnScroll = memoizeOne(\n (\n scrollLeft: number,\n scrollTop: number,\n horizontalScrollDirection: ScrollDirection,\n verticalScrollDirection: ScrollDirection,\n scrollUpdateWasRequested: boolean\n ) =>\n ((this.props.onScroll: any): OnScrollCallback)({\n horizontalScrollDirection,\n scrollLeft,\n scrollTop,\n verticalScrollDirection,\n scrollUpdateWasRequested,\n })\n );\n\n _callPropsCallbacks() {\n const { columnCount, onItemsRendered, onScroll, rowCount } = this.props;\n\n if (typeof onItemsRendered === 'function') {\n if (columnCount > 0 && rowCount > 0) {\n const [\n overscanColumnStartIndex,\n overscanColumnStopIndex,\n visibleColumnStartIndex,\n visibleColumnStopIndex,\n ] = this._getHorizontalRangeToRender();\n const [\n overscanRowStartIndex,\n overscanRowStopIndex,\n visibleRowStartIndex,\n visibleRowStopIndex,\n ] = this._getVerticalRangeToRender();\n this._callOnItemsRendered(\n overscanColumnStartIndex,\n overscanColumnStopIndex,\n overscanRowStartIndex,\n overscanRowStopIndex,\n visibleColumnStartIndex,\n visibleColumnStopIndex,\n visibleRowStartIndex,\n visibleRowStopIndex\n );\n }\n }\n\n if (typeof onScroll === 'function') {\n const {\n horizontalScrollDirection,\n scrollLeft,\n scrollTop,\n scrollUpdateWasRequested,\n verticalScrollDirection,\n } = this.state;\n this._callOnScroll(\n scrollLeft,\n scrollTop,\n horizontalScrollDirection,\n verticalScrollDirection,\n scrollUpdateWasRequested\n );\n }\n }\n\n // Lazily create and cache item styles while scrolling,\n // So that pure component sCU will prevent re-renders.\n // We maintain this cache, and pass a style prop rather than index,\n // So that List can clear cached styles and force item re-render if necessary.\n _getItemStyle: (rowIndex: number, columnIndex: number) => Object;\n _getItemStyle = (rowIndex: number, columnIndex: number): Object => {\n const { columnWidth, direction, rowHeight } = this.props;\n\n const itemStyleCache = this._getItemStyleCache(\n shouldResetStyleCacheOnItemSizeChange && columnWidth,\n shouldResetStyleCacheOnItemSizeChange && direction,\n shouldResetStyleCacheOnItemSizeChange && rowHeight\n );\n\n const key = `${rowIndex}:${columnIndex}`;\n\n let style;\n if (itemStyleCache.hasOwnProperty(key)) {\n style = itemStyleCache[key];\n } else {\n const offset = getColumnOffset(\n this.props,\n columnIndex,\n this._instanceProps\n );\n const isRtl = direction === 'rtl';\n itemStyleCache[key] = style = {\n position: 'absolute',\n left: isRtl ? undefined : offset,\n right: isRtl ? offset : undefined,\n top: getRowOffset(this.props, rowIndex, this._instanceProps),\n height: getRowHeight(this.props, rowIndex, this._instanceProps),\n width: getColumnWidth(this.props, columnIndex, this._instanceProps),\n };\n }\n\n return style;\n };\n\n _getItemStyleCache: (_: any, __: any, ___: any) => ItemStyleCache;\n _getItemStyleCache = memoizeOne((_: any, __: any, ___: any) => ({}));\n\n _getHorizontalRangeToRender(): [number, number, number, number] {\n const {\n columnCount,\n overscanColumnCount,\n overscanColumnsCount,\n overscanCount,\n rowCount,\n } = this.props;\n const { horizontalScrollDirection, isScrolling, scrollLeft } = this.state;\n\n const overscanCountResolved: number =\n overscanColumnCount || overscanColumnsCount || overscanCount || 1;\n\n if (columnCount === 0 || rowCount === 0) {\n return [0, 0, 0, 0];\n }\n\n const startIndex = getColumnStartIndexForOffset(\n this.props,\n scrollLeft,\n this._instanceProps\n );\n const stopIndex = getColumnStopIndexForStartIndex(\n this.props,\n startIndex,\n scrollLeft,\n this._instanceProps\n );\n\n // Overscan by one item in each direction so that tab/focus works.\n // If there isn't at least one extra item, tab loops back around.\n const overscanBackward =\n !isScrolling || horizontalScrollDirection === 'backward'\n ? Math.max(1, overscanCountResolved)\n : 1;\n const overscanForward =\n !isScrolling || horizontalScrollDirection === 'forward'\n ? Math.max(1, overscanCountResolved)\n : 1;\n\n return [\n Math.max(0, startIndex - overscanBackward),\n Math.max(0, Math.min(columnCount - 1, stopIndex + overscanForward)),\n startIndex,\n stopIndex,\n ];\n }\n\n _getVerticalRangeToRender(): [number, number, number, number] {\n const {\n columnCount,\n overscanCount,\n overscanRowCount,\n overscanRowsCount,\n rowCount,\n } = this.props;\n const { isScrolling, verticalScrollDirection, scrollTop } = this.state;\n\n const overscanCountResolved: number =\n overscanRowCount || overscanRowsCount || overscanCount || 1;\n\n if (columnCount === 0 || rowCount === 0) {\n return [0, 0, 0, 0];\n }\n\n const startIndex = getRowStartIndexForOffset(\n this.props,\n scrollTop,\n this._instanceProps\n );\n const stopIndex = getRowStopIndexForStartIndex(\n this.props,\n startIndex,\n scrollTop,\n this._instanceProps\n );\n\n // Overscan by one item in each direction so that tab/focus works.\n // If there isn't at least one extra item, tab loops back around.\n const overscanBackward =\n !isScrolling || verticalScrollDirection === 'backward'\n ? Math.max(1, overscanCountResolved)\n : 1;\n const overscanForward =\n !isScrolling || verticalScrollDirection === 'forward'\n ? Math.max(1, overscanCountResolved)\n : 1;\n\n return [\n Math.max(0, startIndex - overscanBackward),\n Math.max(0, Math.min(rowCount - 1, stopIndex + overscanForward)),\n startIndex,\n stopIndex,\n ];\n }\n\n _onScroll = (event: ScrollEvent): void => {\n const {\n clientHeight,\n clientWidth,\n scrollLeft,\n scrollTop,\n scrollHeight,\n scrollWidth,\n } = event.currentTarget;\n this.setState(prevState => {\n if (\n prevState.scrollLeft === scrollLeft &&\n prevState.scrollTop === scrollTop\n ) {\n // Scroll position may have been updated by cDM/cDU,\n // In which case we don't need to trigger another render,\n // And we don't want to update state.isScrolling.\n return null;\n }\n\n const { direction } = this.props;\n\n // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.\n // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.\n let calculatedScrollLeft = scrollLeft;\n if (direction === 'rtl') {\n switch (getRTLOffsetType()) {\n case 'negative':\n calculatedScrollLeft = -scrollLeft;\n break;\n case 'positive-descending':\n calculatedScrollLeft = scrollWidth - clientWidth - scrollLeft;\n break;\n }\n }\n\n // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n calculatedScrollLeft = Math.max(\n 0,\n Math.min(calculatedScrollLeft, scrollWidth - clientWidth)\n );\n const calculatedScrollTop = Math.max(\n 0,\n Math.min(scrollTop, scrollHeight - clientHeight)\n );\n\n return {\n isScrolling: true,\n horizontalScrollDirection:\n prevState.scrollLeft < scrollLeft ? 'forward' : 'backward',\n scrollLeft: calculatedScrollLeft,\n scrollTop: calculatedScrollTop,\n verticalScrollDirection:\n prevState.scrollTop < scrollTop ? 'forward' : 'backward',\n scrollUpdateWasRequested: false,\n };\n }, this._resetIsScrollingDebounced);\n };\n\n _outerRefSetter = (ref: any): void => {\n const { outerRef } = this.props;\n\n this._outerRef = ((ref: any): HTMLDivElement);\n\n if (typeof outerRef === 'function') {\n outerRef(ref);\n } else if (\n outerRef != null &&\n typeof outerRef === 'object' &&\n outerRef.hasOwnProperty('current')\n ) {\n outerRef.current = ref;\n }\n };\n\n _resetIsScrollingDebounced = () => {\n if (this._resetIsScrollingTimeoutId !== null) {\n cancelTimeout(this._resetIsScrollingTimeoutId);\n }\n\n this._resetIsScrollingTimeoutId = requestTimeout(\n this._resetIsScrolling,\n IS_SCROLLING_DEBOUNCE_INTERVAL\n );\n };\n\n _resetIsScrolling = () => {\n this._resetIsScrollingTimeoutId = null;\n\n this.setState({ isScrolling: false }, () => {\n // Clear style cache after state update has been committed.\n // This way we don't break pure sCU for items that don't use isScrolling param.\n this._getItemStyleCache(-1);\n });\n };\n };\n}\n\nconst validateSharedProps = (\n {\n children,\n direction,\n height,\n innerTagName,\n outerTagName,\n overscanColumnsCount,\n overscanCount,\n overscanRowsCount,\n width,\n }: Props<any>,\n { instance }: State\n): void => {\n if (process.env.NODE_ENV !== 'production') {\n if (typeof overscanCount === 'number') {\n if (devWarningsOverscanCount && !devWarningsOverscanCount.has(instance)) {\n devWarningsOverscanCount.add(instance);\n console.warn(\n 'The overscanCount prop has been deprecated. ' +\n 'Please use the overscanColumnCount and overscanRowCount props instead.'\n );\n }\n }\n\n if (\n typeof overscanColumnsCount === 'number' ||\n typeof overscanRowsCount === 'number'\n ) {\n if (\n devWarningsOverscanRowsColumnsCount &&\n !devWarningsOverscanRowsColumnsCount.has(instance)\n ) {\n devWarningsOverscanRowsColumnsCount.add(instance);\n console.warn(\n 'The overscanColumnsCount and overscanRowsCount props have been deprecated. ' +\n 'Please use the overscanColumnCount and overscanRowCount props instead.'\n );\n }\n }\n\n if (innerTagName != null || outerTagName != null) {\n if (devWarningsTagName && !devWarningsTagName.has(instance)) {\n devWarningsTagName.add(instance);\n console.warn(\n 'The innerTagName and outerTagName props have been deprecated. ' +\n 'Please use the innerElementType and outerElementType props instead.'\n );\n }\n }\n\n if (children == null) {\n throw Error(\n 'An invalid \"children\" prop has been specified. ' +\n 'Value should be a React component. ' +\n `\"${children === null ? 'null' : typeof children}\" was specified.`\n );\n }\n\n switch (direction) {\n case 'ltr':\n case 'rtl':\n // Valid values\n break;\n default:\n throw Error(\n 'An invalid \"direction\" prop has been specified. ' +\n 'Value should be either \"ltr\" or \"rtl\". ' +\n `\"${direction}\" was specified.`\n );\n }\n\n if (typeof width !== 'number') {\n throw Error(\n 'An invalid \"width\" prop has been specified. ' +\n 'Grids must specify a number for width. ' +\n `\"${width === null ? 'null' : typeof width}\" was specified.`\n );\n }\n\n if (typeof height !== 'number') {\n throw Error(\n 'An invalid \"height\" prop has been specified. ' +\n 'Grids must specify a number for height. ' +\n `\"${height === null ? 'null' : typeof height}\" was specified.`\n );\n }\n }\n};\n","// @flow\n\nimport createGridComponent from './createGridComponent';\n\nimport type { Props, ScrollToAlign } from './createGridComponent';\n\nconst DEFAULT_ESTIMATED_ITEM_SIZE = 50;\n\ntype VariableSizeProps = {|\n estimatedColumnWidth: number,\n estimatedRowHeight: number,\n ...Props<any>,\n|};\n\ntype itemSizeGetter = (index: number) => number;\ntype ItemType = 'column' | 'row';\n\ntype ItemMetadata = {|\n offset: number,\n size: number,\n|};\ntype ItemMetadataMap = { [index: number]: ItemMetadata };\ntype InstanceProps = {|\n columnMetadataMap: ItemMetadataMap,\n estimatedColumnWidth: number,\n estimatedRowHeight: number,\n lastMeasuredColumnIndex: number,\n lastMeasuredRowIndex: number,\n rowMetadataMap: ItemMetadataMap,\n|};\n\nconst getEstimatedTotalHeight = (\n { rowCount }: Props<any>,\n { rowMetadataMap, estimatedRowHeight, lastMeasuredRowIndex }: InstanceProps\n) => {\n let totalSizeOfMeasuredRows = 0;\n\n // Edge case check for when the number of items decreases while a scroll is in progress.\n // https://github.com/bvaughn/react-window/pull/138\n if (lastMeasuredRowIndex >= rowCount) {\n lastMeasuredRowIndex = rowCount - 1;\n }\n\n if (lastMeasuredRowIndex >= 0) {\n const itemMetadata = rowMetadataMap[lastMeasuredRowIndex];\n totalSizeOfMeasuredRows = itemMetadata.offset + itemMetadata.size;\n }\n\n const numUnmeasuredItems = rowCount - lastMeasuredRowIndex - 1;\n const totalSizeOfUnmeasuredItems = numUnmeasuredItems * estimatedRowHeight;\n\n return totalSizeOfMeasuredRows + totalSizeOfUnmeasuredItems;\n};\n\nconst getEstimatedTotalWidth = (\n { columnCount }: Props<any>,\n {\n columnMetadataMap,\n estimatedColumnWidth,\n lastMeasuredColumnIndex,\n }: InstanceProps\n) => {\n let totalSizeOfMeasuredRows = 0;\n\n // Edge case check for when the number of items decreases while a scroll is in progress.\n // https://github.com/bvaughn/react-window/pull/138\n if (lastMeasuredColumnIndex >= columnCount) {\n lastMeasuredColumnIndex = columnCount - 1;\n }\n\n if (lastMeasuredColumnIndex >= 0) {\n const itemMetadata = columnMetadataMap[lastMeasuredColumnIndex];\n totalSizeOfMeasuredRows = itemMetadata.offset + itemMetadata.size;\n }\n\n const numUnmeasuredItems = columnCount - lastMeasuredColumnIndex - 1;\n const totalSizeOfUnmeasuredItems = numUnmeasuredItems * estimatedColumnWidth;\n\n return totalSizeOfMeasuredRows + totalSizeOfUnmeasuredItems;\n};\n\nconst getItemMetadata = (\n itemType: ItemType,\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n): ItemMetadata => {\n let itemMetadataMap, itemSize, lastMeasuredIndex;\n if (itemType === 'column') {\n itemMetadataMap = instanceProps.columnMetadataMap;\n itemSize = ((props.columnWidth: any): itemSizeGetter);\n lastMeasuredIndex = instanceProps.lastMeasuredColumnIndex;\n } else {\n itemMetadataMap = instanceProps.rowMetadataMap;\n itemSize = ((props.rowHeight: any): itemSizeGetter);\n lastMeasuredIndex = instanceProps.lastMeasuredRowIndex;\n }\n\n if (index > lastMeasuredIndex) {\n let offset = 0;\n if (lastMeasuredIndex >= 0) {\n const itemMetadata = itemMetadataMap[lastMeasuredIndex];\n offset = itemMetadata.offset + itemMetadata.size;\n }\n\n for (let i = lastMeasuredIndex + 1; i <= index; i++) {\n let size = itemSize(i);\n\n itemMetadataMap[i] = {\n offset,\n size,\n };\n\n offset += size;\n }\n\n if (itemType === 'column') {\n instanceProps.lastMeasuredColumnIndex = index;\n } else {\n instanceProps.lastMeasuredRowIndex = index;\n }\n }\n\n return itemMetadataMap[index];\n};\n\nconst findNearestItem = (\n itemType: ItemType,\n props: Props<any>,\n instanceProps: InstanceProps,\n offset: number\n) => {\n let itemMetadataMap, lastMeasuredIndex;\n if (itemType === 'column') {\n itemMetadataMap = instanceProps.columnMetadataMap;\n lastMeasuredIndex = instanceProps.lastMeasuredColumnIndex;\n } else {\n itemMetadataMap = instanceProps.rowMetadataMap;\n lastMeasuredIndex = instanceProps.lastMeasuredRowIndex;\n }\n\n const lastMeasuredItemOffset =\n lastMeasuredIndex > 0 ? itemMetadataMap[lastMeasuredIndex].offset : 0;\n\n if (lastMeasuredItemOffset >= offset) {\n // If we've already measured items within this range just use a binary search as it's faster.\n return findNearestItemBinarySearch(\n itemType,\n props,\n instanceProps,\n lastMeasuredIndex,\n 0,\n offset\n );\n } else {\n // If we haven't yet measured this high, fallback to an exponential search with an inner binary search.\n // The exponential search avoids pre-computing sizes for the full set of items as a binary search would.\n // The overall complexity for this approach is O(log n).\n return findNearestItemExponentialSearch(\n itemType,\n props,\n instanceProps,\n Math.max(0, lastMeasuredIndex),\n offset\n );\n }\n};\n\nconst findNearestItemBinarySearch = (\n itemType: ItemType,\n props: Props<any>,\n instanceProps: InstanceProps,\n high: number,\n low: number,\n offset: number\n): number => {\n while (low <= high) {\n const middle = low + Math.floor((high - low) / 2);\n const currentOffset = getItemMetadata(\n itemType,\n props,\n middle,\n instanceProps\n ).offset;\n\n if (currentOffset === offset) {\n return middle;\n } else if (currentOffset < offset) {\n low = middle + 1;\n } else if (currentOffset > offset) {\n high = middle - 1;\n }\n }\n\n if (low > 0) {\n return low - 1;\n } else {\n return 0;\n }\n};\n\nconst findNearestItemExponentialSearch = (\n itemType: ItemType,\n props: Props<any>,\n instanceProps: InstanceProps,\n index: number,\n offset: number\n): number => {\n const itemCount = itemType === 'column' ? props.columnCount : props.rowCount;\n let interval = 1;\n\n while (\n index < itemCount &&\n getItemMetadata(itemType, props, index, instanceProps).offset < offset\n ) {\n index += interval;\n interval *= 2;\n }\n\n return findNearestItemBinarySearch(\n itemType,\n props,\n instanceProps,\n Math.min(index, itemCount - 1),\n Math.floor(index / 2),\n offset\n );\n};\n\nconst getOffsetForIndexAndAlignment = (\n itemType: ItemType,\n props: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: InstanceProps,\n scrollbarSize: number\n): number => {\n const size = itemType === 'column' ? props.width : props.height;\n const itemMetadata = getItemMetadata(itemType, props, index, instanceProps);\n\n // Get estimated total size after ItemMetadata is computed,\n // To ensure it reflects actual measurements instead of just estimates.\n const estimatedTotalSize =\n itemType === 'column'\n ? getEstimatedTotalWidth(props, instanceProps)\n : getEstimatedTotalHeight(props, instanceProps);\n\n const maxOffset = Math.max(\n 0,\n Math.min(estimatedTotalSize - size, itemMetadata.offset)\n );\n const minOffset = Math.max(\n 0,\n itemMetadata.offset - size + scrollbarSize + itemMetadata.size\n );\n\n if (align === 'smart') {\n if (scrollOffset >= minOffset - size && scrollOffset <= maxOffset + size) {\n align = 'auto';\n } else {\n align = 'center';\n }\n }\n\n switch (align) {\n case 'start':\n return maxOffset;\n case 'end':\n return minOffset;\n case 'center':\n return Math.round(minOffset + (maxOffset - minOffset) / 2);\n case 'auto':\n default:\n if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {\n return scrollOffset;\n } else if (minOffset > maxOffset) {\n // Because we only take into account the scrollbar size when calculating minOffset\n // this value can be larger than maxOffset when at the end of the list\n return minOffset;\n } else if (scrollOffset < minOffset) {\n return minOffset;\n } else {\n return maxOffset;\n }\n }\n};\n\nconst VariableSizeGrid = createGridComponent({\n getColumnOffset: (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n ): number => getItemMetadata('column', props, index, instanceProps).offset,\n\n getColumnStartIndexForOffset: (\n props: Props<any>,\n scrollLeft: number,\n instanceProps: InstanceProps\n ): number => findNearestItem('column', props, instanceProps, scrollLeft),\n\n getColumnStopIndexForStartIndex: (\n props: Props<any>,\n startIndex: number,\n scrollLeft: number,\n instanceProps: InstanceProps\n ): number => {\n const { columnCount, width } = props;\n\n const itemMetadata = getItemMetadata(\n 'column',\n props,\n startIndex,\n instanceProps\n );\n const maxOffset = scrollLeft + width;\n\n let offset = itemMetadata.offset + itemMetadata.size;\n let stopIndex = startIndex;\n\n while (stopIndex < columnCount - 1 && offset < maxOffset) {\n stopIndex++;\n offset += getItemMetadata('column', props, stopIndex, instanceProps).size;\n }\n\n return stopIndex;\n },\n\n getColumnWidth: (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n ): number => instanceProps.columnMetadataMap[index].size,\n\n getEstimatedTotalHeight,\n getEstimatedTotalWidth,\n\n getOffsetForColumnAndAlignment: (\n props: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: InstanceProps,\n scrollbarSize: number\n ): number =>\n getOffsetForIndexAndAlignment(\n 'column',\n props,\n index,\n align,\n scrollOffset,\n instanceProps,\n scrollbarSize\n ),\n\n getOffsetForRowAndAlignment: (\n props: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: InstanceProps,\n scrollbarSize: number\n ): number =>\n getOffsetForIndexAndAlignment(\n 'row',\n props,\n index,\n align,\n scrollOffset,\n instanceProps,\n scrollbarSize\n ),\n\n getRowOffset: (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n ): number => getItemMetadata('row', props, index, instanceProps).offset,\n\n getRowHeight: (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n ): number => instanceProps.rowMetadataMap[index].size,\n\n getRowStartIndexForOffset: (\n props: Props<any>,\n scrollTop: number,\n instanceProps: InstanceProps\n ): number => findNearestItem('row', props, instanceProps, scrollTop),\n\n getRowStopIndexForStartIndex: (\n props: Props<any>,\n startIndex: number,\n scrollTop: number,\n instanceProps: InstanceProps\n ): number => {\n const { rowCount, height } = props;\n\n const itemMetadata = getItemMetadata(\n 'row',\n props,\n startIndex,\n instanceProps\n );\n const maxOffset = scrollTop + height;\n\n let offset = itemMetadata.offset + itemMetadata.size;\n let stopIndex = startIndex;\n\n while (stopIndex < rowCount - 1 && offset < maxOffset) {\n stopIndex++;\n offset += getItemMetadata('row', props, stopIndex, instanceProps).size;\n }\n\n return stopIndex;\n },\n\n initInstanceProps(props: Props<any>, instance: any): InstanceProps {\n const {\n estimatedColumnWidth,\n estimatedRowHeight,\n } = ((props: any): VariableSizeProps);\n\n const instanceProps = {\n columnMetadataMap: {},\n estimatedColumnWidth: estimatedColumnWidth || DEFAULT_ESTIMATED_ITEM_SIZE,\n estimatedRowHeight: estimatedRowHeight || DEFAULT_ESTIMATED_ITEM_SIZE,\n lastMeasuredColumnIndex: -1,\n lastMeasuredRowIndex: -1,\n rowMetadataMap: {},\n };\n\n instance.resetAfterColumnIndex = (\n columnIndex: number,\n shouldForceUpdate?: boolean = true\n ) => {\n instance.resetAfterIndices({ columnIndex, shouldForceUpdate });\n };\n\n instance.resetAfterRowIndex = (\n rowIndex: number,\n shouldForceUpdate?: boolean = true\n ) => {\n instance.resetAfterIndices({ rowIndex, shouldForceUpdate });\n };\n\n instance.resetAfterIndices = ({\n columnIndex,\n rowIndex,\n shouldForceUpdate = true,\n }: {\n columnIndex?: number,\n rowIndex?: number,\n shouldForceUpdate: boolean,\n }) => {\n if (typeof columnIndex === 'number') {\n instanceProps.lastMeasuredColumnIndex = Math.min(\n instanceProps.lastMeasuredColumnIndex,\n columnIndex - 1\n );\n }\n if (typeof rowIndex === 'number') {\n instanceProps.lastMeasuredRowIndex = Math.min(\n instanceProps.lastMeasuredRowIndex,\n rowIndex - 1\n );\n }\n\n // We could potentially optimize further by only evicting styles after this index,\n // But since styles are only cached while scrolling is in progress-\n // It seems an unnecessary optimization.\n // It's unlikely that resetAfterIndex() will be called while a user is scrolling.\n instance._getItemStyleCache(-1);\n\n if (shouldForceUpdate) {\n instance.forceUpdate();\n }\n };\n\n return instanceProps;\n },\n\n shouldResetStyleCacheOnItemSizeChange: false,\n\n validateProps: ({ columnWidth, rowHeight }: Props<any>): void => {\n if (process.env.NODE_ENV !== 'production') {\n if (typeof columnWidth !== 'function') {\n throw Error(\n 'An invalid \"columnWidth\" prop has been specified. ' +\n 'Value should be a function. ' +\n `\"${\n columnWidth === null ? 'null' : typeof columnWidth\n }\" was specified.`\n );\n } else if (typeof rowHeight !== 'function') {\n throw Error(\n 'An invalid \"rowHeight\" prop has been specified. ' +\n 'Value should be a function. ' +\n `\"${rowHeight === null ? 'null' : typeof rowHeight}\" was specified.`\n );\n }\n }\n },\n});\n\nexport default VariableSizeGrid;\n","// @flow\n\nimport memoizeOne from 'memoize-one';\nimport { createElement, PureComponent } from 'react';\nimport { cancelTimeout, requestTimeout } from './timer';\nimport { getScrollbarSize, getRTLOffsetType } from './domHelpers';\n\nimport type { TimeoutID } from './timer';\n\nexport type ScrollToAlign = 'auto' | 'smart' | 'center' | 'start' | 'end';\n\ntype itemSize = number | ((index: number) => number);\n// TODO Deprecate directions \"horizontal\" and \"vertical\"\ntype Direction = 'ltr' | 'rtl' | 'horizontal' | 'vertical';\ntype Layout = 'horizontal' | 'vertical';\n\ntype RenderComponentProps<T> = {|\n data: T,\n index: number,\n isScrolling?: boolean,\n style: Object,\n|};\ntype RenderComponent<T> = React$ComponentType<$Shape<RenderComponentProps<T>>>;\n\ntype ScrollDirection = 'forward' | 'backward';\n\ntype onItemsRenderedCallback = ({\n overscanStartIndex: number,\n overscanStopIndex: number,\n visibleStartIndex: number,\n visibleStopIndex: number,\n}) => void;\ntype onScrollCallback = ({\n scrollDirection: ScrollDirection,\n scrollOffset: number,\n scrollUpdateWasRequested: boolean,\n}) => void;\n\ntype ScrollEvent = SyntheticEvent<HTMLDivElement>;\ntype ItemStyleCache = { [index: number]: Object };\n\ntype OuterProps = {|\n children: React$Node,\n className: string | void,\n onScroll: ScrollEvent => void,\n style: {\n [string]: mixed,\n },\n|};\n\ntype InnerProps = {|\n children: React$Node,\n style: {\n [string]: mixed,\n },\n|};\n\nexport type Props<T> = {|\n children: RenderComponent<T>,\n className?: string,\n direction: Direction,\n height: number | string,\n initialScrollOffset?: number,\n innerRef?: any,\n innerElementType?: string | React$AbstractComponent<InnerProps, any>,\n innerTagName?: string, // deprecated\n itemCount: number,\n itemData: T,\n itemKey?: (index: number, data: T) => any,\n itemSize: itemSize,\n layout: Layout,\n onItemsRendered?: onItemsRenderedCallback,\n onScroll?: onScrollCallback,\n outerRef?: any,\n outerElementType?: string | React$AbstractComponent<OuterProps, any>,\n outerTagName?: string, // deprecated\n overscanCount: number,\n style?: Object,\n useIsScrolling: boolean,\n width: number | string,\n|};\n\ntype State = {|\n instance: any,\n isScrolling: boolean,\n scrollDirection: ScrollDirection,\n scrollOffset: number,\n scrollUpdateWasRequested: boolean,\n|};\n\ntype GetItemOffset = (\n props: Props<any>,\n index: number,\n instanceProps: any\n) => number;\ntype GetItemSize = (\n props: Props<any>,\n index: number,\n instanceProps: any\n) => number;\ntype GetEstimatedTotalSize = (props: Props<any>, instanceProps: any) => number;\ntype GetOffsetForIndexAndAlignment = (\n props: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: any\n) => number;\ntype GetStartIndexForOffset = (\n props: Props<any>,\n offset: number,\n instanceProps: any\n) => number;\ntype GetStopIndexForStartIndex = (\n props: Props<any>,\n startIndex: number,\n scrollOffset: number,\n instanceProps: any\n) => number;\ntype InitInstanceProps = (props: Props<any>, instance: any) => any;\ntype ValidateProps = (props: Props<any>) => void;\n\nconst IS_SCROLLING_DEBOUNCE_INTERVAL = 150;\n\nconst defaultItemKey = (index: number, data: any) => index;\n\n// In DEV mode, this Set helps us only log a warning once per component instance.\n// This avoids spamming the console every time a render happens.\nlet devWarningsDirection = null;\nlet devWarningsTagName = null;\nif (process.env.NODE_ENV !== 'production') {\n if (typeof window !== 'undefined' && typeof window.WeakSet !== 'undefined') {\n devWarningsDirection = new WeakSet();\n devWarningsTagName = new WeakSet();\n }\n}\n\nexport default function createListComponent({\n getItemOffset,\n getEstimatedTotalSize,\n getItemSize,\n getOffsetForIndexAndAlignment,\n getStartIndexForOffset,\n getStopIndexForStartIndex,\n initInstanceProps,\n shouldResetStyleCacheOnItemSizeChange,\n validateProps,\n}: {|\n getItemOffset: GetItemOffset,\n getEstimatedTotalSize: GetEstimatedTotalSize,\n getItemSize: GetItemSize,\n getOffsetForIndexAndAlignment: GetOffsetForIndexAndAlignment,\n getStartIndexForOffset: GetStartIndexForOffset,\n getStopIndexForStartIndex: GetStopIndexForStartIndex,\n initInstanceProps: InitInstanceProps,\n shouldResetStyleCacheOnItemSizeChange: boolean,\n validateProps: ValidateProps,\n|}) {\n return class List<T> extends PureComponent<Props<T>, State> {\n _instanceProps: any = initInstanceProps(this.props, this);\n _outerRef: ?HTMLDivElement;\n _resetIsScrollingTimeoutId: TimeoutID | null = null;\n\n static defaultProps = {\n direction: 'ltr',\n itemData: undefined,\n layout: 'vertical',\n overscanCount: 2,\n useIsScrolling: false,\n };\n\n state: State = {\n instance: this,\n isScrolling: false,\n scrollDirection: 'forward',\n scrollOffset:\n typeof this.props.initialScrollOffset === 'number'\n ? this.props.initialScrollOffset\n : 0,\n scrollUpdateWasRequested: false,\n };\n\n // Always use explicit constructor for React components.\n // It produces less code after transpilation. (#26)\n // eslint-disable-next-line no-useless-constructor\n constructor(props: Props<T>) {\n super(props);\n }\n\n static getDerivedStateFromProps(\n nextProps: Props<T>,\n prevState: State\n ): $Shape<State> | null {\n validateSharedProps(nextProps, prevState);\n validateProps(nextProps);\n return null;\n }\n\n scrollTo(scrollOffset: number): void {\n scrollOffset = Math.max(0, scrollOffset);\n\n this.setState(prevState => {\n if (prevState.scrollOffset === scrollOffset) {\n return null;\n }\n return {\n scrollDirection:\n prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n scrollOffset: scrollOffset,\n scrollUpdateWasRequested: true,\n };\n }, this._resetIsScrollingDebounced);\n }\n\n scrollToItem(index: number, align: ScrollToAlign = 'auto'): void {\n const { itemCount, layout } = this.props;\n const { scrollOffset } = this.state;\n\n index = Math.max(0, Math.min(index, itemCount - 1));\n\n // The scrollbar size should be considered when scrolling an item into view, to ensure it's fully visible.\n // But we only need to account for its size when it's actually visible.\n // This is an edge case for lists; normally they only scroll in the dominant direction.\n let scrollbarSize = 0;\n if (this._outerRef) {\n const outerRef = ((this._outerRef: any): HTMLElement);\n if (layout === 'vertical') {\n scrollbarSize =\n outerRef.scrollWidth > outerRef.clientWidth\n ? getScrollbarSize()\n : 0;\n } else {\n scrollbarSize =\n outerRef.scrollHeight > outerRef.clientHeight\n ? getScrollbarSize()\n : 0;\n }\n }\n\n this.scrollTo(\n getOffsetForIndexAndAlignment(\n this.props,\n index,\n align,\n scrollOffset,\n this._instanceProps,\n scrollbarSize\n )\n );\n }\n\n componentDidMount() {\n const { direction, initialScrollOffset, layout } = this.props;\n\n if (typeof initialScrollOffset === 'number' && this._outerRef != null) {\n const outerRef = ((this._outerRef: any): HTMLElement);\n // TODO Deprecate direction \"horizontal\"\n if (direction === 'horizontal' || layout === 'horizontal') {\n outerRef.scrollLeft = initialScrollOffset;\n } else {\n outerRef.scrollTop = initialScrollOffset;\n }\n }\n\n this._callPropsCallbacks();\n }\n\n componentDidUpdate() {\n const { direction, layout } = this.props;\n const { scrollOffset, scrollUpdateWasRequested } = this.state;\n\n if (scrollUpdateWasRequested && this._outerRef != null) {\n const outerRef = ((this._outerRef: any): HTMLElement);\n\n // TODO Deprecate direction \"horizontal\"\n if (direction === 'horizontal' || layout === 'horizontal') {\n if (direction === 'rtl') {\n // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n // So we need to determine which browser behavior we're dealing with, and mimic it.\n switch (getRTLOffsetType()) {\n case 'negative':\n outerRef.scrollLeft = -scrollOffset;\n break;\n case 'positive-ascending':\n outerRef.scrollLeft = scrollOffset;\n break;\n default:\n const { clientWidth, scrollWidth } = outerRef;\n outerRef.scrollLeft = scrollWidth - clientWidth - scrollOffset;\n break;\n }\n } else {\n outerRef.scrollLeft = scrollOffset;\n }\n } else {\n outerRef.scrollTop = scrollOffset;\n }\n }\n\n this._callPropsCallbacks();\n }\n\n componentWillUnmount() {\n if (this._resetIsScrollingTimeoutId !== null) {\n cancelTimeout(this._resetIsScrollingTimeoutId);\n }\n }\n\n render() {\n const {\n children,\n className,\n direction,\n height,\n innerRef,\n innerElementType,\n innerTagName,\n itemCount,\n itemData,\n itemKey = defaultItemKey,\n layout,\n outerElementType,\n outerTagName,\n style,\n useIsScrolling,\n width,\n } = this.props;\n const { isScrolling } = this.state;\n\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal =\n direction === 'horizontal' || layout === 'horizontal';\n\n const onScroll = isHorizontal\n ? this._onScrollHorizontal\n : this._onScrollVertical;\n\n const [startIndex, stopIndex] = this._getRangeToRender();\n\n const items = [];\n if (itemCount > 0) {\n for (let index = startIndex; index <= stopIndex; index++) {\n items.push(\n createElement(children, {\n data: itemData,\n key: itemKey(index, itemData),\n index,\n isScrolling: useIsScrolling ? isScrolling : undefined,\n style: this._getItemStyle(index),\n })\n );\n }\n }\n\n // Read this value AFTER items have been created,\n // So their actual sizes (if variable) are taken into consideration.\n const estimatedTotalSize = getEstimatedTotalSize(\n this.props,\n this._instanceProps\n );\n\n return createElement(\n outerElementType || outerTagName || 'div',\n {\n className,\n onScroll,\n ref: this._outerRefSetter,\n style: {\n position: 'relative',\n height,\n width,\n overflow: 'auto',\n WebkitOverflowScrolling: 'touch',\n willChange: 'transform',\n direction,\n ...style,\n },\n },\n createElement(innerElementType || innerTagName || 'div', {\n children: items,\n ref: innerRef,\n style: {\n height: isHorizontal ? '100%' : estimatedTotalSize,\n pointerEvents: isScrolling ? 'none' : undefined,\n width: isHorizontal ? estimatedTotalSize : '100%',\n },\n })\n );\n }\n\n _callOnItemsRendered: (\n overscanStartIndex: number,\n overscanStopIndex: number,\n visibleStartIndex: number,\n visibleStopIndex: number\n ) => void;\n _callOnItemsRendered = memoizeOne(\n (\n overscanStartIndex: number,\n overscanStopIndex: number,\n visibleStartIndex: number,\n visibleStopIndex: number\n ) =>\n ((this.props.onItemsRendered: any): onItemsRenderedCallback)({\n overscanStartIndex,\n overscanStopIndex,\n visibleStartIndex,\n visibleStopIndex,\n })\n );\n\n _callOnScroll: (\n scrollDirection: ScrollDirection,\n scrollOffset: number,\n scrollUpdateWasRequested: boolean\n ) => void;\n _callOnScroll = memoizeOne(\n (\n scrollDirection: ScrollDirection,\n scrollOffset: number,\n scrollUpdateWasRequested: boolean\n ) =>\n ((this.props.onScroll: any): onScrollCallback)({\n scrollDirection,\n scrollOffset,\n scrollUpdateWasRequested,\n })\n );\n\n _callPropsCallbacks() {\n if (typeof this.props.onItemsRendered === 'function') {\n const { itemCount } = this.props;\n if (itemCount > 0) {\n const [\n overscanStartIndex,\n overscanStopIndex,\n visibleStartIndex,\n visibleStopIndex,\n ] = this._getRangeToRender();\n this._callOnItemsRendered(\n overscanStartIndex,\n overscanStopIndex,\n visibleStartIndex,\n visibleStopIndex\n );\n }\n }\n\n if (typeof this.props.onScroll === 'function') {\n const {\n scrollDirection,\n scrollOffset,\n scrollUpdateWasRequested,\n } = this.state;\n this._callOnScroll(\n scrollDirection,\n scrollOffset,\n scrollUpdateWasRequested\n );\n }\n }\n\n // Lazily create and cache item styles while scrolling,\n // So that pure component sCU will prevent re-renders.\n // We maintain this cache, and pass a style prop rather than index,\n // So that List can clear cached styles and force item re-render if necessary.\n _getItemStyle: (index: number) => Object;\n _getItemStyle = (index: number): Object => {\n const { direction, itemSize, layout } = this.props;\n\n const itemStyleCache = this._getItemStyleCache(\n shouldResetStyleCacheOnItemSizeChange && itemSize,\n shouldResetStyleCacheOnItemSizeChange && layout,\n shouldResetStyleCacheOnItemSizeChange && direction\n );\n\n let style;\n if (itemStyleCache.hasOwnProperty(index)) {\n style = itemStyleCache[index];\n } else {\n const offset = getItemOffset(this.props, index, this._instanceProps);\n const size = getItemSize(this.props, index, this._instanceProps);\n\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal =\n direction === 'horizontal' || layout === 'horizontal';\n\n const isRtl = direction === 'rtl';\n const offsetHorizontal = isHorizontal ? offset : 0;\n itemStyleCache[index] = style = {\n position: 'absolute',\n left: isRtl ? undefined : offsetHorizontal,\n right: isRtl ? offsetHorizontal : undefined,\n top: !isHorizontal ? offset : 0,\n height: !isHorizontal ? size : '100%',\n width: isHorizontal ? size : '100%',\n };\n }\n\n return style;\n };\n\n _getItemStyleCache: (_: any, __: any, ___: any) => ItemStyleCache;\n _getItemStyleCache = memoizeOne((_: any, __: any, ___: any) => ({}));\n\n _getRangeToRender(): [number, number, number, number] {\n const { itemCount, overscanCount } = this.props;\n const { isScrolling, scrollDirection, scrollOffset } = this.state;\n\n if (itemCount === 0) {\n return [0, 0, 0, 0];\n }\n\n const startIndex = getStartIndexForOffset(\n this.props,\n scrollOffset,\n this._instanceProps\n );\n const stopIndex = getStopIndexForStartIndex(\n this.props,\n startIndex,\n scrollOffset,\n this._instanceProps\n );\n\n // Overscan by one item in each direction so that tab/focus works.\n // If there isn't at least one extra item, tab loops back around.\n const overscanBackward =\n !isScrolling || scrollDirection === 'backward'\n ? Math.max(1, overscanCount)\n : 1;\n const overscanForward =\n !isScrolling || scrollDirection === 'forward'\n ? Math.max(1, overscanCount)\n : 1;\n\n return [\n Math.max(0, startIndex - overscanBackward),\n Math.max(0, Math.min(itemCount - 1, stopIndex + overscanForward)),\n startIndex,\n stopIndex,\n ];\n }\n\n _onScrollHorizontal = (event: ScrollEvent): void => {\n const { clientWidth, scrollLeft, scrollWidth } = event.currentTarget;\n this.setState(prevState => {\n if (prevState.scrollOffset === scrollLeft) {\n // Scroll position may have been updated by cDM/cDU,\n // In which case we don't need to trigger another render,\n // And we don't want to update state.isScrolling.\n return null;\n }\n\n const { direction } = this.props;\n\n let scrollOffset = scrollLeft;\n if (direction === 'rtl') {\n // TRICKY According to the spec, scrollLeft should be negative for RTL aligned elements.\n // This is not the case for all browsers though (e.g. Chrome reports values as positive, measured relative to the left).\n // It's also easier for this component if we convert offsets to the same format as they would be in for ltr.\n // So the simplest solution is to determine which browser behavior we're dealing with, and convert based on it.\n switch (getRTLOffsetType()) {\n case 'negative':\n scrollOffset = -scrollLeft;\n break;\n case 'positive-descending':\n scrollOffset = scrollWidth - clientWidth - scrollLeft;\n break;\n }\n }\n\n // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n scrollOffset = Math.max(\n 0,\n Math.min(scrollOffset, scrollWidth - clientWidth)\n );\n\n return {\n isScrolling: true,\n scrollDirection:\n prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n scrollOffset,\n scrollUpdateWasRequested: false,\n };\n }, this._resetIsScrollingDebounced);\n };\n\n _onScrollVertical = (event: ScrollEvent): void => {\n const { clientHeight, scrollHeight, scrollTop } = event.currentTarget;\n this.setState(prevState => {\n if (prevState.scrollOffset === scrollTop) {\n // Scroll position may have been updated by cDM/cDU,\n // In which case we don't need to trigger another render,\n // And we don't want to update state.isScrolling.\n return null;\n }\n\n // Prevent Safari's elastic scrolling from causing visual shaking when scrolling past bounds.\n const scrollOffset = Math.max(\n 0,\n Math.min(scrollTop, scrollHeight - clientHeight)\n );\n\n return {\n isScrolling: true,\n scrollDirection:\n prevState.scrollOffset < scrollOffset ? 'forward' : 'backward',\n scrollOffset,\n scrollUpdateWasRequested: false,\n };\n }, this._resetIsScrollingDebounced);\n };\n\n _outerRefSetter = (ref: any): void => {\n const { outerRef } = this.props;\n\n this._outerRef = ((ref: any): HTMLDivElement);\n\n if (typeof outerRef === 'function') {\n outerRef(ref);\n } else if (\n outerRef != null &&\n typeof outerRef === 'object' &&\n outerRef.hasOwnProperty('current')\n ) {\n outerRef.current = ref;\n }\n };\n\n _resetIsScrollingDebounced = () => {\n if (this._resetIsScrollingTimeoutId !== null) {\n cancelTimeout(this._resetIsScrollingTimeoutId);\n }\n\n this._resetIsScrollingTimeoutId = requestTimeout(\n this._resetIsScrolling,\n IS_SCROLLING_DEBOUNCE_INTERVAL\n );\n };\n\n _resetIsScrolling = () => {\n this._resetIsScrollingTimeoutId = null;\n\n this.setState({ isScrolling: false }, () => {\n // Clear style cache after state update has been committed.\n // This way we don't break pure sCU for items that don't use isScrolling param.\n this._getItemStyleCache(-1, null);\n });\n };\n };\n}\n\n// NOTE: I considered further wrapping individual items with a pure ListItem component.\n// This would avoid ever calling the render function for the same index more than once,\n// But it would also add the overhead of a lot of components/fibers.\n// I assume people already do this (render function returning a class component),\n// So my doing it would just unnecessarily double the wrappers.\n\nconst validateSharedProps = (\n {\n children,\n direction,\n height,\n layout,\n innerTagName,\n outerTagName,\n width,\n }: Props<any>,\n { instance }: State\n): void => {\n if (process.env.NODE_ENV !== 'production') {\n if (innerTagName != null || outerTagName != null) {\n if (devWarningsTagName && !devWarningsTagName.has(instance)) {\n devWarningsTagName.add(instance);\n console.warn(\n 'The innerTagName and outerTagName props have been deprecated. ' +\n 'Please use the innerElementType and outerElementType props instead.'\n );\n }\n }\n\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n\n switch (direction) {\n case 'horizontal':\n case 'vertical':\n if (devWarningsDirection && !devWarningsDirection.has(instance)) {\n devWarningsDirection.add(instance);\n console.warn(\n 'The direction prop should be either \"ltr\" (default) or \"rtl\". ' +\n 'Please use the layout prop to specify \"vertical\" (default) or \"horizontal\" orientation.'\n );\n }\n break;\n case 'ltr':\n case 'rtl':\n // Valid values\n break;\n default:\n throw Error(\n 'An invalid \"direction\" prop has been specified. ' +\n 'Value should be either \"ltr\" or \"rtl\". ' +\n `\"${direction}\" was specified.`\n );\n }\n\n switch (layout) {\n case 'horizontal':\n case 'vertical':\n // Valid values\n break;\n default:\n throw Error(\n 'An invalid \"layout\" prop has been specified. ' +\n 'Value should be either \"horizontal\" or \"vertical\". ' +\n `\"${layout}\" was specified.`\n );\n }\n\n if (children == null) {\n throw Error(\n 'An invalid \"children\" prop has been specified. ' +\n 'Value should be a React component. ' +\n `\"${children === null ? 'null' : typeof children}\" was specified.`\n );\n }\n\n if (isHorizontal && typeof width !== 'number') {\n throw Error(\n 'An invalid \"width\" prop has been specified. ' +\n 'Horizontal lists must specify a number for width. ' +\n `\"${width === null ? 'null' : typeof width}\" was specified.`\n );\n } else if (!isHorizontal && typeof height !== 'number') {\n throw Error(\n 'An invalid \"height\" prop has been specified. ' +\n 'Vertical lists must specify a number for height. ' +\n `\"${height === null ? 'null' : typeof height}\" was specified.`\n );\n }\n }\n};\n","// @flow\n\nimport createListComponent from './createListComponent';\n\nimport type { Props, ScrollToAlign } from './createListComponent';\n\nconst DEFAULT_ESTIMATED_ITEM_SIZE = 50;\n\ntype VariableSizeProps = {|\n estimatedItemSize: number,\n ...Props<any>,\n|};\n\ntype itemSizeGetter = (index: number) => number;\n\ntype ItemMetadata = {|\n offset: number,\n size: number,\n|};\ntype InstanceProps = {|\n itemMetadataMap: { [index: number]: ItemMetadata },\n estimatedItemSize: number,\n lastMeasuredIndex: number,\n|};\n\nconst getItemMetadata = (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n): ItemMetadata => {\n const { itemSize } = ((props: any): VariableSizeProps);\n const { itemMetadataMap, lastMeasuredIndex } = instanceProps;\n\n if (index > lastMeasuredIndex) {\n let offset = 0;\n if (lastMeasuredIndex >= 0) {\n const itemMetadata = itemMetadataMap[lastMeasuredIndex];\n offset = itemMetadata.offset + itemMetadata.size;\n }\n\n for (let i = lastMeasuredIndex + 1; i <= index; i++) {\n let size = ((itemSize: any): itemSizeGetter)(i);\n\n itemMetadataMap[i] = {\n offset,\n size,\n };\n\n offset += size;\n }\n\n instanceProps.lastMeasuredIndex = index;\n }\n\n return itemMetadataMap[index];\n};\n\nconst findNearestItem = (\n props: Props<any>,\n instanceProps: InstanceProps,\n offset: number\n) => {\n const { itemMetadataMap, lastMeasuredIndex } = instanceProps;\n\n const lastMeasuredItemOffset =\n lastMeasuredIndex > 0 ? itemMetadataMap[lastMeasuredIndex].offset : 0;\n\n if (lastMeasuredItemOffset >= offset) {\n // If we've already measured items within this range just use a binary search as it's faster.\n return findNearestItemBinarySearch(\n props,\n instanceProps,\n lastMeasuredIndex,\n 0,\n offset\n );\n } else {\n // If we haven't yet measured this high, fallback to an exponential search with an inner binary search.\n // The exponential search avoids pre-computing sizes for the full set of items as a binary search would.\n // The overall complexity for this approach is O(log n).\n return findNearestItemExponentialSearch(\n props,\n instanceProps,\n Math.max(0, lastMeasuredIndex),\n offset\n );\n }\n};\n\nconst findNearestItemBinarySearch = (\n props: Props<any>,\n instanceProps: InstanceProps,\n high: number,\n low: number,\n offset: number\n): number => {\n while (low <= high) {\n const middle = low + Math.floor((high - low) / 2);\n const currentOffset = getItemMetadata(props, middle, instanceProps).offset;\n\n if (currentOffset === offset) {\n return middle;\n } else if (currentOffset < offset) {\n low = middle + 1;\n } else if (currentOffset > offset) {\n high = middle - 1;\n }\n }\n\n if (low > 0) {\n return low - 1;\n } else {\n return 0;\n }\n};\n\nconst findNearestItemExponentialSearch = (\n props: Props<any>,\n instanceProps: InstanceProps,\n index: number,\n offset: number\n): number => {\n const { itemCount } = props;\n let interval = 1;\n\n while (\n index < itemCount &&\n getItemMetadata(props, index, instanceProps).offset < offset\n ) {\n index += interval;\n interval *= 2;\n }\n\n return findNearestItemBinarySearch(\n props,\n instanceProps,\n Math.min(index, itemCount - 1),\n Math.floor(index / 2),\n offset\n );\n};\n\nconst getEstimatedTotalSize = (\n { itemCount }: Props<any>,\n { itemMetadataMap, estimatedItemSize, lastMeasuredIndex }: InstanceProps\n) => {\n let totalSizeOfMeasuredItems = 0;\n\n // Edge case check for when the number of items decreases while a scroll is in progress.\n // https://github.com/bvaughn/react-window/pull/138\n if (lastMeasuredIndex >= itemCount) {\n lastMeasuredIndex = itemCount - 1;\n }\n\n if (lastMeasuredIndex >= 0) {\n const itemMetadata = itemMetadataMap[lastMeasuredIndex];\n totalSizeOfMeasuredItems = itemMetadata.offset + itemMetadata.size;\n }\n\n const numUnmeasuredItems = itemCount - lastMeasuredIndex - 1;\n const totalSizeOfUnmeasuredItems = numUnmeasuredItems * estimatedItemSize;\n\n return totalSizeOfMeasuredItems + totalSizeOfUnmeasuredItems;\n};\n\nconst VariableSizeList = createListComponent({\n getItemOffset: (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n ): number => getItemMetadata(props, index, instanceProps).offset,\n\n getItemSize: (\n props: Props<any>,\n index: number,\n instanceProps: InstanceProps\n ): number => instanceProps.itemMetadataMap[index].size,\n\n getEstimatedTotalSize,\n\n getOffsetForIndexAndAlignment: (\n props: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: InstanceProps,\n scrollbarSize: number\n ): number => {\n const { direction, height, layout, width } = props;\n\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n const size = (((isHorizontal ? width : height): any): number);\n const itemMetadata = getItemMetadata(props, index, instanceProps);\n\n // Get estimated total size after ItemMetadata is computed,\n // To ensure it reflects actual measurements instead of just estimates.\n const estimatedTotalSize = getEstimatedTotalSize(props, instanceProps);\n\n const maxOffset = Math.max(\n 0,\n Math.min(estimatedTotalSize - size, itemMetadata.offset)\n );\n const minOffset = Math.max(\n 0,\n itemMetadata.offset - size + itemMetadata.size + scrollbarSize\n );\n\n if (align === 'smart') {\n if (\n scrollOffset >= minOffset - size &&\n scrollOffset <= maxOffset + size\n ) {\n align = 'auto';\n } else {\n align = 'center';\n }\n }\n\n switch (align) {\n case 'start':\n return maxOffset;\n case 'end':\n return minOffset;\n case 'center':\n return Math.round(minOffset + (maxOffset - minOffset) / 2);\n case 'auto':\n default:\n if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {\n return scrollOffset;\n } else if (scrollOffset < minOffset) {\n return minOffset;\n } else {\n return maxOffset;\n }\n }\n },\n\n getStartIndexForOffset: (\n props: Props<any>,\n offset: number,\n instanceProps: InstanceProps\n ): number => findNearestItem(props, instanceProps, offset),\n\n getStopIndexForStartIndex: (\n props: Props<any>,\n startIndex: number,\n scrollOffset: number,\n instanceProps: InstanceProps\n ): number => {\n const { direction, height, itemCount, layout, width } = props;\n\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n const size = (((isHorizontal ? width : height): any): number);\n const itemMetadata = getItemMetadata(props, startIndex, instanceProps);\n const maxOffset = scrollOffset + size;\n\n let offset = itemMetadata.offset + itemMetadata.size;\n let stopIndex = startIndex;\n\n while (stopIndex < itemCount - 1 && offset < maxOffset) {\n stopIndex++;\n offset += getItemMetadata(props, stopIndex, instanceProps).size;\n }\n\n return stopIndex;\n },\n\n initInstanceProps(props: Props<any>, instance: any): InstanceProps {\n const { estimatedItemSize } = ((props: any): VariableSizeProps);\n\n const instanceProps = {\n itemMetadataMap: {},\n estimatedItemSize: estimatedItemSize || DEFAULT_ESTIMATED_ITEM_SIZE,\n lastMeasuredIndex: -1,\n };\n\n instance.resetAfterIndex = (\n index: number,\n shouldForceUpdate?: boolean = true\n ) => {\n instanceProps.lastMeasuredIndex = Math.min(\n instanceProps.lastMeasuredIndex,\n index - 1\n );\n\n // We could potentially optimize further by only evicting styles after this index,\n // But since styles are only cached while scrolling is in progress-\n // It seems an unnecessary optimization.\n // It's unlikely that resetAfterIndex() will be called while a user is scrolling.\n instance._getItemStyleCache(-1);\n\n if (shouldForceUpdate) {\n instance.forceUpdate();\n }\n };\n\n return instanceProps;\n },\n\n shouldResetStyleCacheOnItemSizeChange: false,\n\n validateProps: ({ itemSize }: Props<any>): void => {\n if (process.env.NODE_ENV !== 'production') {\n if (typeof itemSize !== 'function') {\n throw Error(\n 'An invalid \"itemSize\" prop has been specified. ' +\n 'Value should be a function. ' +\n `\"${itemSize === null ? 'null' : typeof itemSize}\" was specified.`\n );\n }\n }\n },\n});\n\nexport default VariableSizeList;\n","// @flow\n\nimport createGridComponent from './createGridComponent';\n\nimport type { Props, ScrollToAlign } from './createGridComponent';\n\nconst FixedSizeGrid = createGridComponent({\n getColumnOffset: ({ columnWidth }: Props<any>, index: number): number =>\n index * ((columnWidth: any): number),\n\n getColumnWidth: ({ columnWidth }: Props<any>, index: number): number =>\n ((columnWidth: any): number),\n\n getRowOffset: ({ rowHeight }: Props<any>, index: number): number =>\n index * ((rowHeight: any): number),\n\n getRowHeight: ({ rowHeight }: Props<any>, index: number): number =>\n ((rowHeight: any): number),\n\n getEstimatedTotalHeight: ({ rowCount, rowHeight }: Props<any>) =>\n ((rowHeight: any): number) * rowCount,\n\n getEstimatedTotalWidth: ({ columnCount, columnWidth }: Props<any>) =>\n ((columnWidth: any): number) * columnCount,\n\n getOffsetForColumnAndAlignment: (\n { columnCount, columnWidth, width }: Props<any>,\n columnIndex: number,\n align: ScrollToAlign,\n scrollLeft: number,\n instanceProps: typeof undefined,\n scrollbarSize: number\n ): number => {\n const lastColumnOffset = Math.max(\n 0,\n columnCount * ((columnWidth: any): number) - width\n );\n const maxOffset = Math.min(\n lastColumnOffset,\n columnIndex * ((columnWidth: any): number)\n );\n const minOffset = Math.max(\n 0,\n columnIndex * ((columnWidth: any): number) -\n width +\n scrollbarSize +\n ((columnWidth: any): number)\n );\n\n if (align === 'smart') {\n if (scrollLeft >= minOffset - width && scrollLeft <= maxOffset + width) {\n align = 'auto';\n } else {\n align = 'center';\n }\n }\n\n switch (align) {\n case 'start':\n return maxOffset;\n case 'end':\n return minOffset;\n case 'center':\n // \"Centered\" offset is usually the average of the min and max.\n // But near the edges of the list, this doesn't hold true.\n const middleOffset = Math.round(\n minOffset + (maxOffset - minOffset) / 2\n );\n if (middleOffset < Math.ceil(width / 2)) {\n return 0; // near the beginning\n } else if (middleOffset > lastColumnOffset + Math.floor(width / 2)) {\n return lastColumnOffset; // near the end\n } else {\n return middleOffset;\n }\n case 'auto':\n default:\n if (scrollLeft >= minOffset && scrollLeft <= maxOffset) {\n return scrollLeft;\n } else if (minOffset > maxOffset) {\n // Because we only take into account the scrollbar size when calculating minOffset\n // this value can be larger than maxOffset when at the end of the list\n return minOffset;\n } else if (scrollLeft < minOffset) {\n return minOffset;\n } else {\n return maxOffset;\n }\n }\n },\n\n getOffsetForRowAndAlignment: (\n { rowHeight, height, rowCount }: Props<any>,\n rowIndex: number,\n align: ScrollToAlign,\n scrollTop: number,\n instanceProps: typeof undefined,\n scrollbarSize: number\n ): number => {\n const lastRowOffset = Math.max(\n 0,\n rowCount * ((rowHeight: any): number) - height\n );\n const maxOffset = Math.min(\n lastRowOffset,\n rowIndex * ((rowHeight: any): number)\n );\n const minOffset = Math.max(\n 0,\n rowIndex * ((rowHeight: any): number) -\n height +\n scrollbarSize +\n ((rowHeight: any): number)\n );\n\n if (align === 'smart') {\n if (scrollTop >= minOffset - height && scrollTop <= maxOffset + height) {\n align = 'auto';\n } else {\n align = 'center';\n }\n }\n\n switch (align) {\n case 'start':\n return maxOffset;\n case 'end':\n return minOffset;\n case 'center':\n // \"Centered\" offset is usually the average of the min and max.\n // But near the edges of the list, this doesn't hold true.\n const middleOffset = Math.round(\n minOffset + (maxOffset - minOffset) / 2\n );\n if (middleOffset < Math.ceil(height / 2)) {\n return 0; // near the beginning\n } else if (middleOffset > lastRowOffset + Math.floor(height / 2)) {\n return lastRowOffset; // near the end\n } else {\n return middleOffset;\n }\n case 'auto':\n default:\n if (scrollTop >= minOffset && scrollTop <= maxOffset) {\n return scrollTop;\n } else if (minOffset > maxOffset) {\n // Because we only take into account the scrollbar size when calculating minOffset\n // this value can be larger than maxOffset when at the end of the list\n return minOffset;\n } else if (scrollTop < minOffset) {\n return minOffset;\n } else {\n return maxOffset;\n }\n }\n },\n\n getColumnStartIndexForOffset: (\n { columnWidth, columnCount }: Props<any>,\n scrollLeft: number\n ): number =>\n Math.max(\n 0,\n Math.min(\n columnCount - 1,\n Math.floor(scrollLeft / ((columnWidth: any): number))\n )\n ),\n\n getColumnStopIndexForStartIndex: (\n { columnWidth, columnCount, width }: Props<any>,\n startIndex: number,\n scrollLeft: number\n ): number => {\n const left = startIndex * ((columnWidth: any): number);\n const numVisibleColumns = Math.ceil(\n (width + scrollLeft - left) / ((columnWidth: any): number)\n );\n return Math.max(\n 0,\n Math.min(\n columnCount - 1,\n startIndex + numVisibleColumns - 1 // -1 is because stop index is inclusive\n )\n );\n },\n\n getRowStartIndexForOffset: (\n { rowHeight, rowCount }: Props<any>,\n scrollTop: number\n ): number =>\n Math.max(\n 0,\n Math.min(rowCount - 1, Math.floor(scrollTop / ((rowHeight: any): number)))\n ),\n\n getRowStopIndexForStartIndex: (\n { rowHeight, rowCount, height }: Props<any>,\n startIndex: number,\n scrollTop: number\n ): number => {\n const top = startIndex * ((rowHeight: any): number);\n const numVisibleRows = Math.ceil(\n (height + scrollTop - top) / ((rowHeight: any): number)\n );\n return Math.max(\n 0,\n Math.min(\n rowCount - 1,\n startIndex + numVisibleRows - 1 // -1 is because stop index is inclusive\n )\n );\n },\n\n initInstanceProps(props: Props<any>): any {\n // Noop\n },\n\n shouldResetStyleCacheOnItemSizeChange: true,\n\n validateProps: ({ columnWidth, rowHeight }: Props<any>): void => {\n if (process.env.NODE_ENV !== 'production') {\n if (typeof columnWidth !== 'number') {\n throw Error(\n 'An invalid \"columnWidth\" prop has been specified. ' +\n 'Value should be a number. ' +\n `\"${\n columnWidth === null ? 'null' : typeof columnWidth\n }\" was specified.`\n );\n }\n\n if (typeof rowHeight !== 'number') {\n throw Error(\n 'An invalid \"rowHeight\" prop has been specified. ' +\n 'Value should be a number. ' +\n `\"${rowHeight === null ? 'null' : typeof rowHeight}\" was specified.`\n );\n }\n }\n },\n});\n\nexport default FixedSizeGrid;\n","// @flow\n\nimport createListComponent from './createListComponent';\n\nimport type { Props, ScrollToAlign } from './createListComponent';\n\ntype InstanceProps = any;\n\nconst FixedSizeList = createListComponent({\n getItemOffset: ({ itemSize }: Props<any>, index: number): number =>\n index * ((itemSize: any): number),\n\n getItemSize: ({ itemSize }: Props<any>, index: number): number =>\n ((itemSize: any): number),\n\n getEstimatedTotalSize: ({ itemCount, itemSize }: Props<any>) =>\n ((itemSize: any): number) * itemCount,\n\n getOffsetForIndexAndAlignment: (\n { direction, height, itemCount, itemSize, layout, width }: Props<any>,\n index: number,\n align: ScrollToAlign,\n scrollOffset: number,\n instanceProps: InstanceProps,\n scrollbarSize: number\n ): number => {\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n const size = (((isHorizontal ? width : height): any): number);\n const lastItemOffset = Math.max(\n 0,\n itemCount * ((itemSize: any): number) - size\n );\n const maxOffset = Math.min(\n lastItemOffset,\n index * ((itemSize: any): number)\n );\n const minOffset = Math.max(\n 0,\n index * ((itemSize: any): number) -\n size +\n ((itemSize: any): number) +\n scrollbarSize\n );\n\n if (align === 'smart') {\n if (\n scrollOffset >= minOffset - size &&\n scrollOffset <= maxOffset + size\n ) {\n align = 'auto';\n } else {\n align = 'center';\n }\n }\n\n switch (align) {\n case 'start':\n return maxOffset;\n case 'end':\n return minOffset;\n case 'center': {\n // \"Centered\" offset is usually the average of the min and max.\n // But near the edges of the list, this doesn't hold true.\n const middleOffset = Math.round(\n minOffset + (maxOffset - minOffset) / 2\n );\n if (middleOffset < Math.ceil(size / 2)) {\n return 0; // near the beginning\n } else if (middleOffset > lastItemOffset + Math.floor(size / 2)) {\n return lastItemOffset; // near the end\n } else {\n return middleOffset;\n }\n }\n case 'auto':\n default:\n if (scrollOffset >= minOffset && scrollOffset <= maxOffset) {\n return scrollOffset;\n } else if (scrollOffset < minOffset) {\n return minOffset;\n } else {\n return maxOffset;\n }\n }\n },\n\n getStartIndexForOffset: (\n { itemCount, itemSize }: Props<any>,\n offset: number\n ): number =>\n Math.max(\n 0,\n Math.min(itemCount - 1, Math.floor(offset / ((itemSize: any): number)))\n ),\n\n getStopIndexForStartIndex: (\n { direction, height, itemCount, itemSize, layout, width }: Props<any>,\n startIndex: number,\n scrollOffset: number\n ): number => {\n // TODO Deprecate direction \"horizontal\"\n const isHorizontal = direction === 'horizontal' || layout === 'horizontal';\n const offset = startIndex * ((itemSize: any): number);\n const size = (((isHorizontal ? width : height): any): number);\n const numVisibleItems = Math.ceil(\n (size + scrollOffset - offset) / ((itemSize: any): number)\n );\n return Math.max(\n 0,\n Math.min(\n itemCount - 1,\n startIndex + numVisibleItems - 1 // -1 is because stop index is inclusive\n )\n );\n },\n\n initInstanceProps(props: Props<any>): any {\n // Noop\n },\n\n shouldResetStyleCacheOnItemSizeChange: true,\n\n validateProps: ({ itemSize }: Props<any>): void => {\n if (process.env.NODE_ENV !== 'production') {\n if (typeof itemSize !== 'number') {\n throw Error(\n 'An invalid \"itemSize\" prop has been specified. ' +\n 'Value should be a number. ' +\n `\"${itemSize === null ? 'null' : typeof itemSize}\" was specified.`\n );\n }\n }\n },\n});\n\nexport default FixedSizeList;\n","// @flow\n\n// Pulled from react-compat\n// https://github.com/developit/preact-compat/blob/7c5de00e7c85e2ffd011bf3af02899b63f699d3a/src/index.js#L349\nexport default function shallowDiffers(prev: Object, next: Object): boolean {\n for (let attribute in prev) {\n if (!(attribute in next)) {\n return true;\n }\n }\n for (let attribute in next) {\n if (prev[attribute] !== next[attribute]) {\n return true;\n }\n }\n return false;\n}\n","// @flow\n\nimport shallowDiffers from './shallowDiffers';\n\n// Custom comparison function for React.memo().\n// It knows to compare individual style props and ignore the wrapper object.\n// See https://reactjs.org/docs/react-api.html#reactmemo\nexport default function areEqual(\n prevProps: Object,\n nextProps: Object\n): boolean {\n const { style: prevStyle, ...prevRest } = prevProps;\n const { style: nextStyle, ...nextRest } = nextProps;\n\n return 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