{"ast":null,"code":"function _createForOfIteratorHelperLoose(o, allowArrayLike) {\n var it;\n\n if (typeof Symbol === \"undefined\" || o[Symbol.iterator] == null) {\n if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === \"number\") {\n if (it) o = it;\n var i = 0;\n return function () {\n if (i >= o.length) return {\n done: true\n };\n return {\n done: false,\n value: o[i++]\n };\n };\n }\n\n throw new TypeError(\"Invalid attempt to iterate non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\");\n }\n\n it = o[Symbol.iterator]();\n return it.next.bind(it);\n}\n\nfunction _unsupportedIterableToArray(o, minLen) {\n if (!o) return;\n if (typeof o === \"string\") return _arrayLikeToArray(o, minLen);\n var n = Object.prototype.toString.call(o).slice(8, -1);\n if (n === \"Object\" && o.constructor) n = o.constructor.name;\n if (n === \"Map\" || n === \"Set\") return Array.from(o);\n if (n === \"Arguments\" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);\n}\n\nfunction _arrayLikeToArray(arr, len) {\n if (len == null || len > arr.length) len = arr.length;\n\n for (var i = 0, arr2 = new Array(len); i < len; i++) {\n arr2[i] = arr[i];\n }\n\n return arr2;\n}\n\nfunction _extends() {\n _extends = Object.assign || function (target) {\n for (var i = 1; i < arguments.length; i++) {\n var source = arguments[i];\n\n for (var key in source) {\n if (Object.prototype.hasOwnProperty.call(source, key)) {\n target[key] = source[key];\n }\n }\n }\n\n return target;\n };\n\n return _extends.apply(this, arguments);\n}\n\nfunction ownKeys(object, enumerableOnly) {\n var keys = Object.keys(object);\n\n if (Object.getOwnPropertySymbols) {\n var symbols = Object.getOwnPropertySymbols(object);\n if (enumerableOnly) symbols = symbols.filter(function (sym) {\n return Object.getOwnPropertyDescriptor(object, sym).enumerable;\n });\n keys.push.apply(keys, symbols);\n }\n\n return keys;\n}\n\nfunction _objectSpread(target) {\n for (var i = 1; i < arguments.length; i++) {\n var source = arguments[i] != null ? arguments[i] : {};\n\n if (i % 2) {\n ownKeys(Object(source), true).forEach(function (key) {\n _defineProperty(target, key, source[key]);\n });\n } else if (Object.getOwnPropertyDescriptors) {\n Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));\n } else {\n ownKeys(Object(source)).forEach(function (key) {\n Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));\n });\n }\n }\n\n return target;\n}\n\nfunction _defineProperty(obj, key, value) {\n if (key in obj) {\n Object.defineProperty(obj, key, {\n value: value,\n enumerable: true,\n configurable: true,\n writable: true\n });\n } else {\n obj[key] = value;\n }\n\n return obj;\n}\n\nfunction _assertThisInitialized(self) {\n if (self === void 0) {\n throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n }\n\n return self;\n}\n\nfunction _inheritsLoose(subClass, superClass) {\n subClass.prototype = Object.create(superClass.prototype);\n subClass.prototype.constructor = subClass;\n\n _setPrototypeOf(subClass, superClass);\n}\n\nfunction _setPrototypeOf(o, p) {\n _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {\n o.__proto__ = p;\n return o;\n };\n\n return _setPrototypeOf(o, p);\n}\n\nimport Batchinator from \"../Batchinator\";\nimport FillRateHelper from \"../FillRateHelper\";\nimport PropTypes from 'prop-types';\nimport * as React from 'react';\nimport RefreshControl from \"../../../exports/RefreshControl\";\nimport ScrollView from \"../../../exports/ScrollView\";\nimport StyleSheet from \"../../../exports/StyleSheet\";\nimport UIManager from \"../../../exports/UIManager\";\nimport View from \"../../../exports/View\";\nimport ViewabilityHelper from \"../ViewabilityHelper\";\nimport findNodeHandle from \"../../../exports/findNodeHandle\";\nvar flattenStyle = StyleSheet.flatten;\nimport infoLog from \"../infoLog\";\nimport invariant from 'fbjs/lib/invariant';\nimport warning from 'fbjs/lib/warning';\nimport { computeWindowedRenderLimits } from \"../VirtualizeUtils\";\nimport { VirtualizedListCellContextProvider, VirtualizedListContext, VirtualizedListContextProvider } from \"./VirtualizedListContext.js\";\n\nvar __DEV__ = process.env.NODE_ENV !== 'production';\n\nvar _usedIndexForKey = false;\nvar _keylessItemComponentName = '';\n\nvar VirtualizedList = function (_React$PureComponent) {\n _inheritsLoose(VirtualizedList, _React$PureComponent);\n\n var _proto = VirtualizedList.prototype;\n\n _proto.scrollToEnd = function scrollToEnd(params) {\n var animated = params ? params.animated : true;\n var veryLast = this.props.getItemCount(this.props.data) - 1;\n\n var frame = this._getFrameMetricsApprox(veryLast);\n\n var offset = Math.max(0, frame.offset + frame.length + this._footerLength - this._scrollMetrics.visibleLength);\n\n if (this._scrollRef == null) {\n return;\n }\n\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n\n this._scrollRef.scrollTo(this.props.horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n };\n\n _proto.scrollToIndex = function scrollToIndex(params) {\n var _this$props = this.props,\n data = _this$props.data,\n horizontal = _this$props.horizontal,\n getItemCount = _this$props.getItemCount,\n getItemLayout = _this$props.getItemLayout,\n onScrollToIndexFailed = _this$props.onScrollToIndexFailed;\n var animated = params.animated,\n index = params.index,\n viewOffset = params.viewOffset,\n viewPosition = params.viewPosition;\n invariant(index >= 0, \"scrollToIndex out of range: requested index \" + index + \" but minimum is 0\");\n invariant(getItemCount(data) >= 1, \"scrollToIndex out of range: item length \" + getItemCount(data) + \" but minimum is 1\");\n invariant(index < getItemCount(data), \"scrollToIndex out of range: requested index \" + index + \" is out of 0 to \" + (getItemCount(data) - 1));\n\n if (!getItemLayout && index > this._highestMeasuredFrameIndex) {\n invariant(!!onScrollToIndexFailed, 'scrollToIndex should be used in conjunction with getItemLayout or onScrollToIndexFailed, ' + 'otherwise there is no way to know the location of offscreen indices or handle failures.');\n onScrollToIndexFailed({\n averageItemLength: this._averageCellLength,\n highestMeasuredFrameIndex: this._highestMeasuredFrameIndex,\n index: index\n });\n return;\n }\n\n var frame = this._getFrameMetricsApprox(index);\n\n var offset = Math.max(0, frame.offset - (viewPosition || 0) * (this._scrollMetrics.visibleLength - frame.length)) - (viewOffset || 0);\n\n if (this._scrollRef == null) {\n return;\n }\n\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n\n this._scrollRef.scrollTo(horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n };\n\n _proto.scrollToItem = function scrollToItem(params) {\n var item = params.item;\n var _this$props2 = this.props,\n data = _this$props2.data,\n getItem = _this$props2.getItem,\n getItemCount = _this$props2.getItemCount;\n var itemCount = getItemCount(data);\n\n for (var _index = 0; _index < itemCount; _index++) {\n if (getItem(data, _index) === item) {\n this.scrollToIndex(_objectSpread(_objectSpread({}, params), {}, {\n index: _index\n }));\n break;\n }\n }\n };\n\n _proto.scrollToOffset = function scrollToOffset(params) {\n var animated = params.animated,\n offset = params.offset;\n\n if (this._scrollRef == null) {\n return;\n }\n\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n\n this._scrollRef.scrollTo(this.props.horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n };\n\n _proto.recordInteraction = function recordInteraction() {\n this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref.recordInteraction();\n });\n\n this._viewabilityTuples.forEach(function (t) {\n t.viewabilityHelper.recordInteraction();\n });\n\n this._updateViewableItems(this.props.data);\n };\n\n _proto.flashScrollIndicators = function flashScrollIndicators() {\n if (this._scrollRef == null) {\n return;\n }\n\n this._scrollRef.flashScrollIndicators();\n };\n\n _proto.getScrollResponder = function getScrollResponder() {\n if (this._scrollRef && this._scrollRef.getScrollResponder) {\n return this._scrollRef.getScrollResponder();\n }\n };\n\n _proto.getScrollableNode = function getScrollableNode() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n return this._scrollRef.getScrollableNode();\n } else {\n return findNodeHandle(this._scrollRef);\n }\n };\n\n _proto.getScrollRef = function getScrollRef() {\n if (this._scrollRef && this._scrollRef.getScrollRef) {\n return this._scrollRef.getScrollRef();\n } else {\n return this._scrollRef;\n }\n };\n\n _proto.setNativeProps = function setNativeProps(props) {\n if (this._scrollRef) {\n this._scrollRef.setNativeProps(props);\n }\n };\n\n _proto._getCellKey = function _getCellKey() {\n var _this$context;\n\n return ((_this$context = this.context) == null ? void 0 : _this$context.cellKey) || 'rootList';\n };\n\n _proto._getListKey = function _getListKey() {\n return this.props.listKey || this._getCellKey();\n };\n\n _proto._getDebugInfo = function _getDebugInfo() {\n var _this$context2;\n\n return {\n listKey: this._getListKey(),\n cellKey: this._getCellKey(),\n horizontal: !!this.props.horizontal,\n parent: (_this$context2 = this.context) == null ? void 0 : _this$context2.debugInfo\n };\n };\n\n _proto.hasMore = function hasMore() {\n return this._hasMore;\n };\n\n function VirtualizedList(_props) {\n var _this;\n\n _this = _React$PureComponent.call(this, _props) || this;\n\n _this._getScrollMetrics = function () {\n return _this._scrollMetrics;\n };\n\n _this._getOutermostParentListRef = function () {\n if (_this._isNestedWithSameOrientation()) {\n return _this.context.getOutermostParentListRef();\n } else {\n return _assertThisInitialized(_this);\n }\n };\n\n _this._getNestedChildState = function (key) {\n var existingChildData = _this._nestedChildLists.get(key);\n\n return existingChildData && existingChildData.state;\n };\n\n _this._registerAsNestedChild = function (childList) {\n var childListsInCell = _this._cellKeysToChildListKeys.get(childList.cellKey) || new Set();\n childListsInCell.add(childList.key);\n\n _this._cellKeysToChildListKeys.set(childList.cellKey, childListsInCell);\n\n var existingChildData = _this._nestedChildLists.get(childList.key);\n\n if (existingChildData && existingChildData.ref !== null) {\n console.error('A VirtualizedList contains a cell which itself contains ' + 'more than one VirtualizedList of the same orientation as the parent ' + 'list. You must pass a unique listKey prop to each sibling list.\\n\\n' + describeNestedLists(_objectSpread(_objectSpread({}, childList), {}, {\n horizontal: !!childList.ref.props.horizontal\n })));\n }\n\n _this._nestedChildLists.set(childList.key, {\n ref: childList.ref,\n state: null\n });\n\n if (_this._hasInteracted) {\n childList.ref.recordInteraction();\n }\n };\n\n _this._unregisterAsNestedChild = function (childList) {\n _this._nestedChildLists.set(childList.key, {\n ref: null,\n state: childList.state\n });\n };\n\n _this._onUpdateSeparators = function (keys, newProps) {\n keys.forEach(function (key) {\n var ref = key != null && _this._cellRefs[key];\n ref && ref.updateSeparatorProps(newProps);\n });\n };\n\n _this._averageCellLength = 0;\n _this._cellKeysToChildListKeys = new Map();\n _this._cellRefs = {};\n _this._frames = {};\n _this._footerLength = 0;\n _this._hasDoneInitialScroll = false;\n _this._hasInteracted = false;\n _this._hasMore = false;\n _this._hasWarned = {};\n _this._headerLength = 0;\n _this._hiPriInProgress = false;\n _this._highestMeasuredFrameIndex = 0;\n _this._indicesToKeys = new Map();\n _this._nestedChildLists = new Map();\n _this._offsetFromParentVirtualizedList = 0;\n _this._prevParentOffset = 0;\n _this._scrollMetrics = {\n contentLength: 0,\n dOffset: 0,\n dt: 10,\n offset: 0,\n timestamp: 0,\n velocity: 0,\n visibleLength: 0\n };\n _this._scrollRef = null;\n _this._sentEndForContentLength = 0;\n _this._totalCellLength = 0;\n _this._totalCellsMeasured = 0;\n _this._viewabilityTuples = [];\n\n _this._captureScrollRef = function (ref) {\n _this._scrollRef = ref;\n };\n\n _this._defaultRenderScrollComponent = function (props) {\n var onRefresh = props.onRefresh;\n\n if (_this._isNestedWithSameOrientation()) {\n return React.createElement(View, props);\n } else if (onRefresh) {\n invariant(typeof props.refreshing === 'boolean', '`refreshing` prop must be set as a boolean in order to use `onRefresh`, but got `' + JSON.stringify(props.refreshing) + '`');\n return React.createElement(ScrollView, _extends({}, props, {\n refreshControl: props.refreshControl == null ? React.createElement(RefreshControl, {\n refreshing: props.refreshing,\n onRefresh: onRefresh,\n progressViewOffset: props.progressViewOffset\n }) : props.refreshControl\n }));\n } else {\n return React.createElement(ScrollView, props);\n }\n };\n\n _this._onCellUnmount = function (cellKey) {\n var curr = _this._frames[cellKey];\n\n if (curr) {\n _this._frames[cellKey] = _objectSpread(_objectSpread({}, curr), {}, {\n inLayout: false\n });\n }\n };\n\n _this._onLayout = function (e) {\n if (_this._isNestedWithSameOrientation()) {\n _this.measureLayoutRelativeToContainingList();\n } else {\n _this._scrollMetrics.visibleLength = _this._selectLength(e.nativeEvent.layout);\n }\n\n _this.props.onLayout && _this.props.onLayout(e);\n\n _this._scheduleCellsToRenderUpdate();\n\n _this._maybeCallOnEndReached();\n };\n\n _this._onLayoutEmpty = function (e) {\n _this.props.onLayout && _this.props.onLayout(e);\n };\n\n _this._onLayoutFooter = function (e) {\n _this._triggerRemeasureForChildListsInCell(_this._getFooterCellKey());\n\n _this._footerLength = _this._selectLength(e.nativeEvent.layout);\n };\n\n _this._onLayoutHeader = function (e) {\n _this._headerLength = _this._selectLength(e.nativeEvent.layout);\n };\n\n _this._onContentSizeChange = function (width, height) {\n if (width > 0 && height > 0 && _this.props.initialScrollIndex != null && _this.props.initialScrollIndex > 0 && !_this._hasDoneInitialScroll) {\n _this._hasDoneInitialScroll = true;\n }\n\n if (_this.props.onContentSizeChange) {\n _this.props.onContentSizeChange(width, height);\n }\n\n _this._scrollMetrics.contentLength = _this._selectLength({\n height: height,\n width: width\n });\n\n _this._scheduleCellsToRenderUpdate();\n\n _this._maybeCallOnEndReached();\n };\n\n _this._convertParentScrollMetrics = function (metrics) {\n var offset = metrics.offset - _this._offsetFromParentVirtualizedList;\n var visibleLength = metrics.visibleLength;\n var dOffset = offset - _this._scrollMetrics.offset;\n var contentLength = _this._scrollMetrics.contentLength;\n return {\n visibleLength: visibleLength,\n contentLength: contentLength,\n offset: offset,\n dOffset: dOffset\n };\n };\n\n _this._onScroll = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onScroll(e);\n });\n\n if (_this.props.onScroll) {\n _this.props.onScroll(e);\n }\n\n var timestamp = e.timeStamp;\n\n var visibleLength = _this._selectLength(e.nativeEvent.layoutMeasurement);\n\n var contentLength = _this._selectLength(e.nativeEvent.contentSize);\n\n var offset = _this._selectOffset(e.nativeEvent.contentOffset);\n\n var dOffset = offset - _this._scrollMetrics.offset;\n\n if (_this._isNestedWithSameOrientation()) {\n if (_this._scrollMetrics.contentLength === 0) {\n return;\n }\n\n var _this$_convertParentS = _this._convertParentScrollMetrics({\n visibleLength: visibleLength,\n offset: offset\n });\n\n visibleLength = _this$_convertParentS.visibleLength;\n contentLength = _this$_convertParentS.contentLength;\n offset = _this$_convertParentS.offset;\n dOffset = _this$_convertParentS.dOffset;\n }\n\n var dt = _this._scrollMetrics.timestamp ? Math.max(1, timestamp - _this._scrollMetrics.timestamp) : 1;\n var velocity = dOffset / dt;\n\n if (dt > 500 && _this._scrollMetrics.dt > 500 && contentLength > 5 * visibleLength && !_this._hasWarned.perf) {\n infoLog('VirtualizedList: You have a large list that is slow to update - make sure your ' + 'renderItem function renders components that follow React performance best practices ' + 'like PureComponent, shouldComponentUpdate, etc.', {\n dt: dt,\n prevDt: _this._scrollMetrics.dt,\n contentLength: contentLength\n });\n _this._hasWarned.perf = true;\n }\n\n _this._scrollMetrics = {\n contentLength: contentLength,\n dt: dt,\n dOffset: dOffset,\n offset: offset,\n timestamp: timestamp,\n velocity: velocity,\n visibleLength: visibleLength\n };\n\n _this._updateViewableItems(_this.props.data);\n\n if (!_this.props) {\n return;\n }\n\n _this._maybeCallOnEndReached();\n\n if (velocity !== 0) {\n _this._fillRateHelper.activate();\n }\n\n _this._computeBlankness();\n\n _this._scheduleCellsToRenderUpdate();\n };\n\n _this._onScrollBeginDrag = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onScrollBeginDrag(e);\n });\n\n _this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.recordInteraction();\n });\n\n _this._hasInteracted = true;\n _this.props.onScrollBeginDrag && _this.props.onScrollBeginDrag(e);\n };\n\n _this._onScrollEndDrag = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onScrollEndDrag(e);\n });\n\n var velocity = e.nativeEvent.velocity;\n\n if (velocity) {\n _this._scrollMetrics.velocity = _this._selectOffset(velocity);\n }\n\n _this._computeBlankness();\n\n _this.props.onScrollEndDrag && _this.props.onScrollEndDrag(e);\n };\n\n _this._onMomentumScrollBegin = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onMomentumScrollBegin(e);\n });\n\n _this.props.onMomentumScrollBegin && _this.props.onMomentumScrollBegin(e);\n };\n\n _this._onMomentumScrollEnd = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onMomentumScrollEnd(e);\n });\n\n _this._scrollMetrics.velocity = 0;\n\n _this._computeBlankness();\n\n _this.props.onMomentumScrollEnd && _this.props.onMomentumScrollEnd(e);\n };\n\n _this._updateCellsToRender = function () {\n var _this$props3 = _this.props,\n data = _this$props3.data,\n getItemCount = _this$props3.getItemCount,\n onEndReachedThreshold = _this$props3.onEndReachedThreshold;\n\n var isVirtualizationDisabled = _this._isVirtualizationDisabled();\n\n _this._updateViewableItems(data);\n\n if (!data) {\n return;\n }\n\n _this.setState(function (state) {\n var newState;\n var _this$_scrollMetrics = _this._scrollMetrics,\n contentLength = _this$_scrollMetrics.contentLength,\n offset = _this$_scrollMetrics.offset,\n visibleLength = _this$_scrollMetrics.visibleLength;\n\n if (!isVirtualizationDisabled) {\n if (visibleLength > 0 && contentLength > 0) {\n if (!_this.props.initialScrollIndex || _this._scrollMetrics.offset) {\n newState = computeWindowedRenderLimits(_this.props, state, _this._getFrameMetricsApprox, _this._scrollMetrics);\n }\n }\n } else {\n var distanceFromEnd = contentLength - visibleLength - offset;\n var renderAhead = distanceFromEnd < onEndReachedThreshold * visibleLength ? _this.props.maxToRenderPerBatch : 0;\n newState = {\n first: 0,\n last: Math.min(state.last + renderAhead, getItemCount(data) - 1)\n };\n }\n\n if (newState && _this._nestedChildLists.size > 0) {\n var newFirst = newState.first;\n var newLast = newState.last;\n\n for (var ii = newFirst; ii <= newLast; ii++) {\n var cellKeyForIndex = _this._indicesToKeys.get(ii);\n\n var childListKeys = cellKeyForIndex && _this._cellKeysToChildListKeys.get(cellKeyForIndex);\n\n if (!childListKeys) {\n continue;\n }\n\n var someChildHasMore = false;\n\n for (var _iterator = _createForOfIteratorHelperLoose(childListKeys), _step; !(_step = _iterator()).done;) {\n var childKey = _step.value;\n\n var childList = _this._nestedChildLists.get(childKey);\n\n if (childList && childList.ref && childList.ref.hasMore()) {\n someChildHasMore = true;\n break;\n }\n }\n\n if (someChildHasMore && newState) {\n newState.last = ii;\n break;\n }\n }\n }\n\n if (newState != null && newState.first === state.first && newState.last === state.last) {\n newState = null;\n }\n\n return newState;\n });\n };\n\n _this._createViewToken = function (index, isViewable) {\n var _this$props4 = _this.props,\n data = _this$props4.data,\n getItem = _this$props4.getItem,\n keyExtractor = _this$props4.keyExtractor;\n var item = getItem(data, index);\n return {\n index: index,\n item: item,\n key: keyExtractor(item, index),\n isViewable: isViewable\n };\n };\n\n _this._getFrameMetricsApprox = function (index) {\n var frame = _this._getFrameMetrics(index);\n\n if (frame && frame.index === index) {\n return frame;\n } else {\n var getItemLayout = _this.props.getItemLayout;\n invariant(!getItemLayout, 'Should not have to estimate frames when a measurement metrics function is provided');\n return {\n length: _this._averageCellLength,\n offset: _this._averageCellLength * index\n };\n }\n };\n\n _this._getFrameMetrics = function (index) {\n var _this$props5 = _this.props,\n data = _this$props5.data,\n getItem = _this$props5.getItem,\n getItemCount = _this$props5.getItemCount,\n getItemLayout = _this$props5.getItemLayout,\n keyExtractor = _this$props5.keyExtractor;\n invariant(getItemCount(data) > index, 'Tried to get frame for out of range index ' + index);\n var item = getItem(data, index);\n\n var frame = item && _this._frames[keyExtractor(item, index)];\n\n if (!frame || frame.index !== index) {\n if (getItemLayout) {\n frame = getItemLayout(data, index);\n }\n }\n\n return frame;\n };\n\n invariant(!_props.onScroll || !_props.onScroll.__isNative, 'Components based on VirtualizedList must be wrapped with Animated.createAnimatedComponent ' + 'to support native onScroll events with useNativeDriver');\n invariant(_props.windowSize > 0, 'VirtualizedList: The windowSize prop must be present and set to a value greater than 0.');\n _this._fillRateHelper = new FillRateHelper(_this._getFrameMetrics);\n _this._updateCellsToRenderBatcher = new Batchinator(_this._updateCellsToRender, _this.props.updateCellsBatchingPeriod);\n\n if (_this.props.viewabilityConfigCallbackPairs) {\n _this._viewabilityTuples = _this.props.viewabilityConfigCallbackPairs.map(function (pair) {\n return {\n viewabilityHelper: new ViewabilityHelper(pair.viewabilityConfig),\n onViewableItemsChanged: pair.onViewableItemsChanged\n };\n });\n } else if (_this.props.onViewableItemsChanged) {\n var onViewableItemsChanged = _this.props.onViewableItemsChanged;\n\n _this._viewabilityTuples.push({\n viewabilityHelper: new ViewabilityHelper(_this.props.viewabilityConfig),\n onViewableItemsChanged: onViewableItemsChanged\n });\n }\n\n var initialState = {\n first: _this.props.initialScrollIndex || 0,\n last: Math.min(_this.props.getItemCount(_this.props.data), (_this.props.initialScrollIndex || 0) + _this.props.initialNumToRender) - 1\n };\n\n if (_this._isNestedWithSameOrientation()) {\n var storedState = _this.context.getNestedChildState(_this._getListKey());\n\n if (storedState) {\n initialState = storedState;\n _this.state = storedState;\n _this._frames = storedState.frames;\n }\n }\n\n _this.state = initialState;\n return _this;\n }\n\n _proto.componentDidMount = function componentDidMount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.registerAsNestedChild({\n cellKey: this._getCellKey(),\n key: this._getListKey(),\n ref: this,\n parentDebugInfo: this.context.debugInfo\n });\n }\n };\n\n _proto.componentWillUnmount = function componentWillUnmount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.unregisterAsNestedChild({\n key: this._getListKey(),\n state: {\n first: this.state.first,\n last: this.state.last,\n frames: this._frames\n }\n });\n }\n\n this._updateViewableItems(null);\n\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.dispose();\n });\n\n this._fillRateHelper.deactivateAndFlush();\n };\n\n VirtualizedList.getDerivedStateFromProps = function getDerivedStateFromProps(newProps, prevState) {\n var data = newProps.data,\n getItemCount = newProps.getItemCount,\n maxToRenderPerBatch = newProps.maxToRenderPerBatch;\n return {\n first: Math.max(0, Math.min(prevState.first, getItemCount(data) - 1 - maxToRenderPerBatch)),\n last: Math.max(0, Math.min(prevState.last, getItemCount(data) - 1))\n };\n };\n\n _proto._pushCells = function _pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, first, last, inversionStyle) {\n var _this2 = this;\n\n var _this$props6 = this.props,\n CellRendererComponent = _this$props6.CellRendererComponent,\n ItemSeparatorComponent = _this$props6.ItemSeparatorComponent,\n data = _this$props6.data,\n getItem = _this$props6.getItem,\n getItemCount = _this$props6.getItemCount,\n horizontal = _this$props6.horizontal,\n keyExtractor = _this$props6.keyExtractor;\n var stickyOffset = this.props.ListHeaderComponent ? 1 : 0;\n var end = getItemCount(data) - 1;\n var prevCellKey;\n last = Math.min(end, last);\n\n var _loop = function _loop(ii) {\n var item = getItem(data, ii);\n var key = keyExtractor(item, ii);\n\n _this2._indicesToKeys.set(ii, key);\n\n if (stickyIndicesFromProps.has(ii + stickyOffset)) {\n stickyHeaderIndices.push(cells.length);\n }\n\n cells.push(React.createElement(CellRenderer, {\n CellRendererComponent: CellRendererComponent,\n ItemSeparatorComponent: ii < end ? ItemSeparatorComponent : undefined,\n cellKey: key,\n fillRateHelper: _this2._fillRateHelper,\n horizontal: horizontal,\n index: ii,\n inversionStyle: inversionStyle,\n item: item,\n key: key,\n prevCellKey: prevCellKey,\n onUpdateSeparators: _this2._onUpdateSeparators,\n onLayout: function onLayout(e) {\n return _this2._onCellLayout(e, key, ii);\n },\n onUnmount: _this2._onCellUnmount,\n parentProps: _this2.props,\n ref: function ref(_ref) {\n _this2._cellRefs[key] = _ref;\n }\n }));\n prevCellKey = key;\n };\n\n for (var ii = first; ii <= last; ii++) {\n _loop(ii);\n }\n };\n\n _proto._isVirtualizationDisabled = function _isVirtualizationDisabled() {\n return this.props.disableVirtualization || false;\n };\n\n _proto._isNestedWithSameOrientation = function _isNestedWithSameOrientation() {\n var nestedContext = this.context;\n return !!(nestedContext && !!nestedContext.horizontal === !!this.props.horizontal);\n };\n\n _proto.render = function render() {\n var _this3 = this;\n\n if (__DEV__) {\n var flatStyles = flattenStyle(this.props.contentContainerStyle);\n\n if (flatStyles != null && flatStyles.flexWrap === 'wrap') {\n console.warn('`flexWrap: `wrap`` is not supported with the `VirtualizedList` components.' + 'Consider using `numColumns` with `FlatList` instead.');\n }\n }\n\n var _this$props7 = this.props,\n ListEmptyComponent = _this$props7.ListEmptyComponent,\n ListFooterComponent = _this$props7.ListFooterComponent,\n ListHeaderComponent = _this$props7.ListHeaderComponent;\n var _this$props8 = this.props,\n data = _this$props8.data,\n horizontal = _this$props8.horizontal;\n\n var isVirtualizationDisabled = this._isVirtualizationDisabled();\n\n var inversionStyle = this.props.inverted ? this.props.horizontal ? styles.horizontallyInverted : styles.verticallyInverted : null;\n var cells = [];\n var stickyIndicesFromProps = new Set(this.props.stickyHeaderIndices);\n var stickyHeaderIndices = [];\n\n if (ListHeaderComponent) {\n if (stickyIndicesFromProps.has(0)) {\n stickyHeaderIndices.push(0);\n }\n\n var element = React.isValidElement(ListHeaderComponent) ? ListHeaderComponent : React.createElement(ListHeaderComponent, null);\n cells.push(React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getCellKey() + '-header',\n key: \"$header\"\n }, React.createElement(View, {\n onLayout: this._onLayoutHeader,\n style: StyleSheet.compose(inversionStyle, this.props.ListHeaderComponentStyle)\n }, element)));\n }\n\n var itemCount = this.props.getItemCount(data);\n\n if (itemCount > 0) {\n _usedIndexForKey = false;\n _keylessItemComponentName = '';\n var spacerKey = !horizontal ? 'height' : 'width';\n var lastInitialIndex = this.props.initialScrollIndex ? -1 : this.props.initialNumToRender - 1;\n var _this$state = this.state,\n first = _this$state.first,\n last = _this$state.last;\n\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, 0, lastInitialIndex, inversionStyle);\n\n var firstAfterInitial = Math.max(lastInitialIndex + 1, first);\n\n if (!isVirtualizationDisabled && first > lastInitialIndex + 1) {\n var insertedStickySpacer = false;\n\n if (stickyIndicesFromProps.size > 0) {\n var stickyOffset = ListHeaderComponent ? 1 : 0;\n\n for (var ii = firstAfterInitial - 1; ii > lastInitialIndex; ii--) {\n if (stickyIndicesFromProps.has(ii + stickyOffset)) {\n var _ref2, _ref3;\n\n var initBlock = this._getFrameMetricsApprox(lastInitialIndex);\n\n var stickyBlock = this._getFrameMetricsApprox(ii);\n\n var leadSpace = stickyBlock.offset - initBlock.offset - (this.props.initialScrollIndex ? 0 : initBlock.length);\n cells.push(React.createElement(View, {\n key: \"$sticky_lead\",\n style: (_ref2 = {}, _ref2[spacerKey] = leadSpace, _ref2)\n }));\n\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, ii, ii, inversionStyle);\n\n var trailSpace = this._getFrameMetricsApprox(first).offset - (stickyBlock.offset + stickyBlock.length);\n cells.push(React.createElement(View, {\n key: \"$sticky_trail\",\n style: (_ref3 = {}, _ref3[spacerKey] = trailSpace, _ref3)\n }));\n insertedStickySpacer = true;\n break;\n }\n }\n }\n\n if (!insertedStickySpacer) {\n var _ref4;\n\n var _initBlock = this._getFrameMetricsApprox(lastInitialIndex);\n\n var firstSpace = this._getFrameMetricsApprox(first).offset - (_initBlock.offset + _initBlock.length);\n\n cells.push(React.createElement(View, {\n key: \"$lead_spacer\",\n style: (_ref4 = {}, _ref4[spacerKey] = firstSpace, _ref4)\n }));\n }\n }\n\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, firstAfterInitial, last, inversionStyle);\n\n if (!this._hasWarned.keys && _usedIndexForKey) {\n console.warn('VirtualizedList: missing keys for items, make sure to specify a key or id property on each ' + 'item or provide a custom keyExtractor.', _keylessItemComponentName);\n this._hasWarned.keys = true;\n }\n\n if (!isVirtualizationDisabled && last < itemCount - 1) {\n var _ref5;\n\n var lastFrame = this._getFrameMetricsApprox(last);\n\n var end = this.props.getItemLayout ? itemCount - 1 : Math.min(itemCount - 1, this._highestMeasuredFrameIndex);\n\n var endFrame = this._getFrameMetricsApprox(end);\n\n var tailSpacerLength = endFrame.offset + endFrame.length - (lastFrame.offset + lastFrame.length);\n cells.push(React.createElement(View, {\n key: \"$tail_spacer\",\n style: (_ref5 = {}, _ref5[spacerKey] = tailSpacerLength, _ref5)\n }));\n }\n } else if (ListEmptyComponent) {\n var _element = React.isValidElement(ListEmptyComponent) ? ListEmptyComponent : React.createElement(ListEmptyComponent, null);\n\n cells.push(React.cloneElement(_element, {\n key: '$empty',\n onLayout: function onLayout(event) {\n _this3._onLayoutEmpty(event);\n\n if (_element.props.onLayout) {\n _element.props.onLayout(event);\n }\n },\n style: StyleSheet.compose(inversionStyle, _element.props.style)\n }));\n }\n\n if (ListFooterComponent) {\n var _element2 = React.isValidElement(ListFooterComponent) ? ListFooterComponent : React.createElement(ListFooterComponent, null);\n\n cells.push(React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getFooterCellKey(),\n key: \"$footer\"\n }, React.createElement(View, {\n onLayout: this._onLayoutFooter,\n style: StyleSheet.compose(inversionStyle, this.props.ListFooterComponentStyle)\n }, _element2)));\n }\n\n var scrollProps = _objectSpread(_objectSpread({}, this.props), {}, {\n onContentSizeChange: this._onContentSizeChange,\n onLayout: this._onLayout,\n onScroll: this._onScroll,\n onScrollBeginDrag: this._onScrollBeginDrag,\n onScrollEndDrag: this._onScrollEndDrag,\n onMomentumScrollBegin: this._onMomentumScrollBegin,\n onMomentumScrollEnd: this._onMomentumScrollEnd,\n scrollEventThrottle: this.props.scrollEventThrottle,\n stickyHeaderIndices: stickyHeaderIndices,\n style: inversionStyle ? [inversionStyle, this.props.style] : this.props.style\n });\n\n this._hasMore = this.state.last < this.props.getItemCount(this.props.data) - 1;\n var innerRet = React.createElement(VirtualizedListContextProvider, {\n value: {\n cellKey: null,\n getScrollMetrics: this._getScrollMetrics,\n horizontal: this.props.horizontal,\n getOutermostParentListRef: this._getOutermostParentListRef,\n getNestedChildState: this._getNestedChildState,\n registerAsNestedChild: this._registerAsNestedChild,\n unregisterAsNestedChild: this._unregisterAsNestedChild,\n debugInfo: this._getDebugInfo()\n }\n }, React.cloneElement((this.props.renderScrollComponent || this._defaultRenderScrollComponent)(scrollProps), {\n ref: this._captureScrollRef\n }, cells));\n var ret = innerRet;\n\n if (this.props.debug) {\n return React.createElement(View, {\n style: styles.debug\n }, ret, this._renderDebugOverlay());\n } else {\n return ret;\n }\n };\n\n _proto.componentDidUpdate = function componentDidUpdate(prevProps) {\n var _this$props9 = this.props,\n data = _this$props9.data,\n extraData = _this$props9.extraData;\n\n if (data !== prevProps.data || extraData !== prevProps.extraData) {\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.resetViewableIndices();\n });\n }\n\n var hiPriInProgress = this._hiPriInProgress;\n\n this._scheduleCellsToRenderUpdate();\n\n if (hiPriInProgress) {\n this._hiPriInProgress = false;\n }\n };\n\n _proto._computeBlankness = function _computeBlankness() {\n this._fillRateHelper.computeBlankness(this.props, this.state, this._scrollMetrics);\n };\n\n _proto._onCellLayout = function _onCellLayout(e, cellKey, index) {\n var layout = e.nativeEvent.layout;\n var next = {\n offset: this._selectOffset(layout),\n length: this._selectLength(layout),\n index: index,\n inLayout: true\n };\n var curr = this._frames[cellKey];\n\n if (!curr || next.offset !== curr.offset || next.length !== curr.length || index !== curr.index) {\n this._totalCellLength += next.length - (curr ? curr.length : 0);\n this._totalCellsMeasured += curr ? 0 : 1;\n this._averageCellLength = this._totalCellLength / this._totalCellsMeasured;\n this._frames[cellKey] = next;\n this._highestMeasuredFrameIndex = Math.max(this._highestMeasuredFrameIndex, index);\n\n this._scheduleCellsToRenderUpdate();\n } else {\n this._frames[cellKey].inLayout = true;\n }\n\n this._triggerRemeasureForChildListsInCell(cellKey);\n\n this._computeBlankness();\n\n this._updateViewableItems(this.props.data);\n };\n\n _proto._triggerRemeasureForChildListsInCell = function _triggerRemeasureForChildListsInCell(cellKey) {\n var childListKeys = this._cellKeysToChildListKeys.get(cellKey);\n\n if (childListKeys) {\n for (var _iterator2 = _createForOfIteratorHelperLoose(childListKeys), _step2; !(_step2 = _iterator2()).done;) {\n var childKey = _step2.value;\n\n var childList = this._nestedChildLists.get(childKey);\n\n childList && childList.ref && childList.ref.measureLayoutRelativeToContainingList();\n }\n }\n };\n\n _proto.measureLayoutRelativeToContainingList = function measureLayoutRelativeToContainingList() {\n var _this4 = this;\n\n try {\n if (!this._scrollRef) {\n return;\n }\n\n this._scrollRef.measureLayout(this.context.getOutermostParentListRef().getScrollRef(), function (x, y, width, height) {\n _this4._offsetFromParentVirtualizedList = _this4._selectOffset({\n x: x,\n y: y\n });\n _this4._scrollMetrics.contentLength = _this4._selectLength({\n width: width,\n height: height\n });\n\n var scrollMetrics = _this4._convertParentScrollMetrics(_this4.context.getScrollMetrics());\n\n _this4._scrollMetrics.visibleLength = scrollMetrics.visibleLength;\n _this4._scrollMetrics.offset = scrollMetrics.offset;\n }, function (error) {\n console.warn(\"VirtualizedList: Encountered an error while measuring a list's\" + ' offset from its containing VirtualizedList.');\n });\n } catch (error) {\n console.warn('measureLayoutRelativeToContainingList threw an error', error.stack);\n }\n };\n\n _proto._getFooterCellKey = function _getFooterCellKey() {\n return this._getCellKey() + '-footer';\n };\n\n _proto._renderDebugOverlay = function _renderDebugOverlay() {\n var normalize = this._scrollMetrics.visibleLength / (this._scrollMetrics.contentLength || 1);\n var framesInLayout = [];\n var itemCount = this.props.getItemCount(this.props.data);\n\n for (var ii = 0; ii < itemCount; ii++) {\n var frame = this._getFrameMetricsApprox(ii);\n\n if (frame.inLayout) {\n framesInLayout.push(frame);\n }\n }\n\n var windowTop = this._getFrameMetricsApprox(this.state.first).offset;\n\n var frameLast = this._getFrameMetricsApprox(this.state.last);\n\n var windowLen = frameLast.offset + frameLast.length - windowTop;\n var visTop = this._scrollMetrics.offset;\n var visLen = this._scrollMetrics.visibleLength;\n return React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlay]\n }, framesInLayout.map(function (f, ii) {\n return React.createElement(View, {\n key: 'f' + ii,\n style: [styles.debugOverlayBase, styles.debugOverlayFrame, {\n top: f.offset * normalize,\n height: f.length * normalize\n }]\n });\n }), React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlayFrameLast, {\n top: windowTop * normalize,\n height: windowLen * normalize\n }]\n }), React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlayFrameVis, {\n top: visTop * normalize,\n height: visLen * normalize\n }]\n }));\n };\n\n _proto._selectLength = function _selectLength(metrics) {\n return !this.props.horizontal ? metrics.height : metrics.width;\n };\n\n _proto._selectOffset = function _selectOffset(metrics) {\n return !this.props.horizontal ? metrics.y : metrics.x;\n };\n\n _proto._maybeCallOnEndReached = function _maybeCallOnEndReached() {\n var _this$props10 = this.props,\n data = _this$props10.data,\n getItemCount = _this$props10.getItemCount,\n onEndReached = _this$props10.onEndReached,\n onEndReachedThreshold = _this$props10.onEndReachedThreshold;\n var _this$_scrollMetrics2 = this._scrollMetrics,\n contentLength = _this$_scrollMetrics2.contentLength,\n visibleLength = _this$_scrollMetrics2.visibleLength,\n offset = _this$_scrollMetrics2.offset;\n var distanceFromEnd = contentLength - visibleLength - offset;\n var threshold = onEndReachedThreshold ? onEndReachedThreshold * visibleLength : 2;\n\n if (onEndReached && this.state.last === getItemCount(data) - 1 && distanceFromEnd < threshold && this._scrollMetrics.contentLength !== this._sentEndForContentLength) {\n this._sentEndForContentLength = this._scrollMetrics.contentLength;\n onEndReached({\n distanceFromEnd: distanceFromEnd\n });\n } else if (distanceFromEnd > threshold) {\n this._sentEndForContentLength = 0;\n }\n };\n\n _proto._scheduleCellsToRenderUpdate = function _scheduleCellsToRenderUpdate() {\n var _this$state2 = this.state,\n first = _this$state2.first,\n last = _this$state2.last;\n var _this$_scrollMetrics3 = this._scrollMetrics,\n offset = _this$_scrollMetrics3.offset,\n visibleLength = _this$_scrollMetrics3.visibleLength,\n velocity = _this$_scrollMetrics3.velocity;\n var itemCount = this.props.getItemCount(this.props.data);\n var hiPri = false;\n var scrollingThreshold = this.props.onEndReachedThreshold * visibleLength / 2;\n\n if (first > 0) {\n var distTop = offset - this._getFrameMetricsApprox(first).offset;\n\n hiPri = hiPri || distTop < 0 || velocity < -2 && distTop < scrollingThreshold;\n }\n\n if (last < itemCount - 1) {\n var distBottom = this._getFrameMetricsApprox(last).offset - (offset + visibleLength);\n hiPri = hiPri || distBottom < 0 || velocity > 2 && distBottom < scrollingThreshold;\n }\n\n if (hiPri && (this._averageCellLength || this.props.getItemLayout) && !this._hiPriInProgress) {\n this._hiPriInProgress = true;\n\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n\n this._updateCellsToRender();\n\n return;\n } else {\n this._updateCellsToRenderBatcher.schedule();\n }\n };\n\n _proto._updateViewableItems = function _updateViewableItems(data) {\n var _this5 = this;\n\n var getItemCount = this.props.getItemCount;\n\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.onUpdate(getItemCount(data), _this5._scrollMetrics.offset, _this5._scrollMetrics.visibleLength, _this5._getFrameMetrics, _this5._createViewToken, tuple.onViewableItemsChanged, _this5.state);\n });\n };\n\n return VirtualizedList;\n}(React.PureComponent);\n\nVirtualizedList.contextType = VirtualizedListContext;\nVirtualizedList.defaultProps = {\n disableVirtualization: false,\n horizontal: false,\n initialNumToRender: 10,\n keyExtractor: function keyExtractor(item, index) {\n if (item.key != null) {\n return item.key;\n }\n\n if (item.id != null) {\n return item.id;\n }\n\n _usedIndexForKey = true;\n\n if (item.type && item.type.displayName) {\n _keylessItemComponentName = item.type.displayName;\n }\n\n return String(index);\n },\n maxToRenderPerBatch: 10,\n onEndReachedThreshold: 2,\n scrollEventThrottle: 50,\n updateCellsBatchingPeriod: 50,\n windowSize: 21\n};\n\nvar CellRenderer = function (_React$Component) {\n _inheritsLoose(CellRenderer, _React$Component);\n\n function CellRenderer() {\n var _this6;\n\n for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n args[_key] = arguments[_key];\n }\n\n _this6 = _React$Component.call.apply(_React$Component, [this].concat(args)) || this;\n _this6.state = {\n separatorProps: {\n highlighted: false,\n leadingItem: _this6.props.item\n }\n };\n _this6._separators = {\n highlight: function highlight() {\n var _this6$props = _this6.props,\n cellKey = _this6$props.cellKey,\n prevCellKey = _this6$props.prevCellKey;\n\n _this6.props.onUpdateSeparators([cellKey, prevCellKey], {\n highlighted: true\n });\n },\n unhighlight: function unhighlight() {\n var _this6$props2 = _this6.props,\n cellKey = _this6$props2.cellKey,\n prevCellKey = _this6$props2.prevCellKey;\n\n _this6.props.onUpdateSeparators([cellKey, prevCellKey], {\n highlighted: false\n });\n },\n updateProps: function updateProps(select, newProps) {\n var _this6$props3 = _this6.props,\n cellKey = _this6$props3.cellKey,\n prevCellKey = _this6$props3.prevCellKey;\n\n _this6.props.onUpdateSeparators([select === 'leading' ? prevCellKey : cellKey], newProps);\n }\n };\n return _this6;\n }\n\n CellRenderer.getDerivedStateFromProps = function getDerivedStateFromProps(props, prevState) {\n return {\n separatorProps: _objectSpread(_objectSpread({}, prevState.separatorProps), {}, {\n leadingItem: props.item\n })\n };\n };\n\n var _proto2 = CellRenderer.prototype;\n\n _proto2.updateSeparatorProps = function updateSeparatorProps(newProps) {\n this.setState(function (state) {\n return {\n separatorProps: _objectSpread(_objectSpread({}, state.separatorProps), newProps)\n };\n });\n };\n\n _proto2.componentWillUnmount = function componentWillUnmount() {\n this.props.onUnmount(this.props.cellKey);\n };\n\n _proto2._renderElement = function _renderElement(renderItem, ListItemComponent, item, index) {\n if (renderItem && ListItemComponent) {\n console.warn('VirtualizedList: Both ListItemComponent and renderItem props are present. ListItemComponent will take' + ' precedence over renderItem.');\n }\n\n if (ListItemComponent) {\n return React.createElement(ListItemComponent, {\n item: item,\n index: index,\n separators: this._separators\n });\n }\n\n if (renderItem) {\n return renderItem({\n item: item,\n index: index,\n separators: this._separators\n });\n }\n\n invariant(false, 'VirtualizedList: Either ListItemComponent or renderItem props are required but none were found.');\n };\n\n _proto2.render = function render() {\n var _this$props11 = this.props,\n CellRendererComponent = _this$props11.CellRendererComponent,\n ItemSeparatorComponent = _this$props11.ItemSeparatorComponent,\n fillRateHelper = _this$props11.fillRateHelper,\n horizontal = _this$props11.horizontal,\n item = _this$props11.item,\n index = _this$props11.index,\n inversionStyle = _this$props11.inversionStyle,\n parentProps = _this$props11.parentProps;\n var renderItem = parentProps.renderItem,\n getItemLayout = parentProps.getItemLayout,\n ListItemComponent = parentProps.ListItemComponent;\n\n var element = this._renderElement(renderItem, ListItemComponent, item, index);\n\n var onLayout = getItemLayout && !parentProps.debug && !fillRateHelper.enabled() ? undefined : this.props.onLayout;\n var itemSeparator = ItemSeparatorComponent && React.createElement(ItemSeparatorComponent, this.state.separatorProps);\n var cellStyle = inversionStyle ? horizontal ? 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? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\n/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * \n * @format\n */\nimport Batchinator from '../Batchinator';\nimport FillRateHelper from '../FillRateHelper';\nimport PropTypes from 'prop-types';\nimport * as React from 'react';\nimport RefreshControl from '../../../exports/RefreshControl';\nimport ScrollView from '../../../exports/ScrollView';\nimport StyleSheet from '../../../exports/StyleSheet';\nimport UIManager from '../../../exports/UIManager';\nimport View from '../../../exports/View';\nimport ViewabilityHelper from '../ViewabilityHelper';\nimport findNodeHandle from '../../../exports/findNodeHandle';\nvar flattenStyle = StyleSheet.flatten;\nimport infoLog from '../infoLog';\nimport invariant from 'fbjs/lib/invariant';\nimport warning from 'fbjs/lib/warning';\nimport { computeWindowedRenderLimits } from '../VirtualizeUtils';\nimport { VirtualizedListCellContextProvider, VirtualizedListContext, VirtualizedListContextProvider } from './VirtualizedListContext.js';\n\nvar __DEV__ = process.env.NODE_ENV !== 'production';\n\nvar _usedIndexForKey = false;\nvar _keylessItemComponentName = '';\n\n/**\n * Base implementation for the more convenient [``](https://reactnative.dev/docs/flatlist.html)\n * and [``](https://reactnative.dev/docs/sectionlist.html) components, which are also better\n * documented. In general, this should only really be used if you need more flexibility than\n * `FlatList` provides, e.g. for use with immutable data instead of plain arrays.\n *\n * Virtualization massively improves memory consumption and performance of large lists by\n * maintaining a finite render window of active items and replacing all items outside of the render\n * window with appropriately sized blank space. The window adapts to scrolling behavior, and items\n * are rendered incrementally with low-pri (after any running interactions) if they are far from the\n * visible area, or with hi-pri otherwise to minimize the potential of seeing blank space.\n *\n * Some caveats:\n *\n * - Internal state is not preserved when content scrolls out of the render window. Make sure all\n * your data is captured in the item data or external stores like Flux, Redux, or Relay.\n * - This is a `PureComponent` which means that it will not re-render if `props` remain shallow-\n * equal. Make sure that everything your `renderItem` function depends on is passed as a prop\n * (e.g. `extraData`) that is not `===` after updates, otherwise your UI may not update on\n * changes. This includes the `data` prop and parent component state.\n * - In order to constrain memory and enable smooth scrolling, content is rendered asynchronously\n * offscreen. This means it's possible to scroll faster than the fill rate ands momentarily see\n * blank content. This is a tradeoff that can be adjusted to suit the needs of each application,\n * and we are working on improving it behind the scenes.\n * - By default, the list looks for a `key` or `id` prop on each item and uses that for the React key.\n * Alternatively, you can provide a custom `keyExtractor` prop.\n *\n */\nvar VirtualizedList = /*#__PURE__*/function (_React$PureComponent) {\n _inheritsLoose(VirtualizedList, _React$PureComponent);\n\n var _proto = VirtualizedList.prototype;\n\n // scrollToEnd may be janky without getItemLayout prop\n _proto.scrollToEnd = function scrollToEnd(params) {\n var animated = params ? params.animated : true;\n var veryLast = this.props.getItemCount(this.props.data) - 1;\n\n var frame = this._getFrameMetricsApprox(veryLast);\n\n var offset = Math.max(0, frame.offset + frame.length + this._footerLength - this._scrollMetrics.visibleLength);\n\n if (this._scrollRef == null) {\n return;\n }\n\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n\n this._scrollRef.scrollTo(this.props.horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n } // scrollToIndex may be janky without getItemLayout prop\n ;\n\n _proto.scrollToIndex = function scrollToIndex(params) {\n var _this$props = this.props,\n data = _this$props.data,\n horizontal = _this$props.horizontal,\n getItemCount = _this$props.getItemCount,\n getItemLayout = _this$props.getItemLayout,\n onScrollToIndexFailed = _this$props.onScrollToIndexFailed;\n var animated = params.animated,\n index = params.index,\n viewOffset = params.viewOffset,\n viewPosition = params.viewPosition;\n invariant(index >= 0, \"scrollToIndex out of range: requested index \" + index + \" but minimum is 0\");\n invariant(getItemCount(data) >= 1, \"scrollToIndex out of range: item length \" + getItemCount(data) + \" but minimum is 1\");\n invariant(index < getItemCount(data), \"scrollToIndex out of range: requested index \" + index + \" is out of 0 to \" + (getItemCount(data) - 1));\n\n if (!getItemLayout && index > this._highestMeasuredFrameIndex) {\n invariant(!!onScrollToIndexFailed, 'scrollToIndex should be used in conjunction with getItemLayout or onScrollToIndexFailed, ' + 'otherwise there is no way to know the location of offscreen indices or handle failures.');\n onScrollToIndexFailed({\n averageItemLength: this._averageCellLength,\n highestMeasuredFrameIndex: this._highestMeasuredFrameIndex,\n index: index\n });\n return;\n }\n\n var frame = this._getFrameMetricsApprox(index);\n\n var offset = Math.max(0, frame.offset - (viewPosition || 0) * (this._scrollMetrics.visibleLength - frame.length)) - (viewOffset || 0);\n\n if (this._scrollRef == null) {\n return;\n }\n\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n\n this._scrollRef.scrollTo(horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n } // scrollToItem may be janky without getItemLayout prop. Required linear scan through items -\n // use scrollToIndex instead if possible.\n ;\n\n _proto.scrollToItem = function scrollToItem(params) {\n var item = params.item;\n var _this$props2 = this.props,\n data = _this$props2.data,\n getItem = _this$props2.getItem,\n getItemCount = _this$props2.getItemCount;\n var itemCount = getItemCount(data);\n\n for (var _index = 0; _index < itemCount; _index++) {\n if (getItem(data, _index) === item) {\n this.scrollToIndex(_objectSpread(_objectSpread({}, params), {}, {\n index: _index\n }));\n break;\n }\n }\n }\n /**\n * Scroll to a specific content pixel offset in the list.\n *\n * Param `offset` expects the offset to scroll to.\n * In case of `horizontal` is true, the offset is the x-value,\n * in any other case the offset is the y-value.\n *\n * Param `animated` (`true` by default) defines whether the list\n * should do an animation while scrolling.\n */\n ;\n\n _proto.scrollToOffset = function scrollToOffset(params) {\n var animated = params.animated,\n offset = params.offset;\n\n if (this._scrollRef == null) {\n return;\n }\n\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n\n this._scrollRef.scrollTo(this.props.horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n };\n\n _proto.recordInteraction = function recordInteraction() {\n this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref.recordInteraction();\n });\n\n this._viewabilityTuples.forEach(function (t) {\n t.viewabilityHelper.recordInteraction();\n });\n\n this._updateViewableItems(this.props.data);\n };\n\n _proto.flashScrollIndicators = function flashScrollIndicators() {\n if (this._scrollRef == null) {\n return;\n }\n\n this._scrollRef.flashScrollIndicators();\n }\n /**\n * Provides a handle to the underlying scroll responder.\n * Note that `this._scrollRef` might not be a `ScrollView`, so we\n * need to check that it responds to `getScrollResponder` before calling it.\n */\n ;\n\n _proto.getScrollResponder = function getScrollResponder() {\n if (this._scrollRef && this._scrollRef.getScrollResponder) {\n return this._scrollRef.getScrollResponder();\n }\n };\n\n _proto.getScrollableNode = function getScrollableNode() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n return this._scrollRef.getScrollableNode();\n } else {\n return findNodeHandle(this._scrollRef);\n }\n };\n\n _proto.getScrollRef = function getScrollRef() {\n if (this._scrollRef && this._scrollRef.getScrollRef) {\n return this._scrollRef.getScrollRef();\n } else {\n return this._scrollRef;\n }\n };\n\n _proto.setNativeProps = function setNativeProps(props) {\n if (this._scrollRef) {\n this._scrollRef.setNativeProps(props);\n }\n };\n\n _proto._getCellKey = function _getCellKey() {\n var _this$context;\n\n return ((_this$context = this.context) == null ? void 0 : _this$context.cellKey) || 'rootList';\n };\n\n _proto._getListKey = function _getListKey() {\n return this.props.listKey || this._getCellKey();\n };\n\n _proto._getDebugInfo = function _getDebugInfo() {\n var _this$context2;\n\n return {\n listKey: this._getListKey(),\n cellKey: this._getCellKey(),\n horizontal: !!this.props.horizontal,\n parent: (_this$context2 = this.context) == null ? void 0 : _this$context2.debugInfo\n };\n };\n\n _proto.hasMore = function hasMore() {\n return this._hasMore;\n };\n\n function VirtualizedList(_props) {\n var _this;\n\n _this = _React$PureComponent.call(this, _props) || this;\n\n _this._getScrollMetrics = function () {\n return _this._scrollMetrics;\n };\n\n _this._getOutermostParentListRef = function () {\n if (_this._isNestedWithSameOrientation()) {\n return _this.context.getOutermostParentListRef();\n } else {\n return _assertThisInitialized(_this);\n }\n };\n\n _this._getNestedChildState = function (key) {\n var existingChildData = _this._nestedChildLists.get(key);\n\n return existingChildData && existingChildData.state;\n };\n\n _this._registerAsNestedChild = function (childList) {\n // Register the mapping between this child key and the cellKey for its cell\n var childListsInCell = _this._cellKeysToChildListKeys.get(childList.cellKey) || new Set();\n childListsInCell.add(childList.key);\n\n _this._cellKeysToChildListKeys.set(childList.cellKey, childListsInCell);\n\n var existingChildData = _this._nestedChildLists.get(childList.key);\n\n if (existingChildData && existingChildData.ref !== null) {\n console.error('A VirtualizedList contains a cell which itself contains ' + 'more than one VirtualizedList of the same orientation as the parent ' + 'list. You must pass a unique listKey prop to each sibling list.\\n\\n' + describeNestedLists(_objectSpread(_objectSpread({}, childList), {}, {\n // We're called from the child's componentDidMount, so it's safe to\n // read the child's props here (albeit weird).\n horizontal: !!childList.ref.props.horizontal\n })));\n }\n\n _this._nestedChildLists.set(childList.key, {\n ref: childList.ref,\n state: null\n });\n\n if (_this._hasInteracted) {\n childList.ref.recordInteraction();\n }\n };\n\n _this._unregisterAsNestedChild = function (childList) {\n _this._nestedChildLists.set(childList.key, {\n ref: null,\n state: childList.state\n });\n };\n\n _this._onUpdateSeparators = function (keys, newProps) {\n keys.forEach(function (key) {\n var ref = key != null && _this._cellRefs[key];\n ref && ref.updateSeparatorProps(newProps);\n });\n };\n\n _this._averageCellLength = 0;\n _this._cellKeysToChildListKeys = new Map();\n _this._cellRefs = {};\n _this._frames = {};\n _this._footerLength = 0;\n _this._hasDoneInitialScroll = false;\n _this._hasInteracted = false;\n _this._hasMore = false;\n _this._hasWarned = {};\n _this._headerLength = 0;\n _this._hiPriInProgress = false;\n _this._highestMeasuredFrameIndex = 0;\n _this._indicesToKeys = new Map();\n _this._nestedChildLists = new Map();\n _this._offsetFromParentVirtualizedList = 0;\n _this._prevParentOffset = 0;\n _this._scrollMetrics = {\n contentLength: 0,\n dOffset: 0,\n dt: 10,\n offset: 0,\n timestamp: 0,\n velocity: 0,\n visibleLength: 0\n };\n _this._scrollRef = null;\n _this._sentEndForContentLength = 0;\n _this._totalCellLength = 0;\n _this._totalCellsMeasured = 0;\n _this._viewabilityTuples = [];\n\n _this._captureScrollRef = function (ref) {\n _this._scrollRef = ref;\n };\n\n _this._defaultRenderScrollComponent = function (props) {\n var onRefresh = props.onRefresh;\n\n if (_this._isNestedWithSameOrientation()) {\n // $FlowFixMe - Typing ReactNativeComponent revealed errors\n return /*#__PURE__*/React.createElement(View, props);\n } else if (onRefresh) {\n invariant(typeof props.refreshing === 'boolean', '`refreshing` prop must be set as a boolean in order to use `onRefresh`, but got `' +\n /* $FlowFixMe(>=0.111.0 site=react_native_fb) This comment suppresses\n * an error found when Flow v0.111 was deployed. To see the error,\n * delete this comment and run Flow. */\n JSON.stringify(props.refreshing) + '`');\n return (\n /*#__PURE__*/\n // $FlowFixMe Invalid prop usage\n React.createElement(ScrollView, _extends({}, props, {\n refreshControl: props.refreshControl == null ? /*#__PURE__*/React.createElement(RefreshControl, {\n refreshing: props.refreshing,\n onRefresh: onRefresh,\n progressViewOffset: props.progressViewOffset\n }) : props.refreshControl\n }))\n );\n } else {\n // $FlowFixMe Invalid prop usage\n return /*#__PURE__*/React.createElement(ScrollView, props);\n }\n };\n\n _this._onCellUnmount = function (cellKey) {\n var curr = _this._frames[cellKey];\n\n if (curr) {\n _this._frames[cellKey] = _objectSpread(_objectSpread({}, curr), {}, {\n inLayout: false\n });\n }\n };\n\n _this._onLayout = function (e) {\n if (_this._isNestedWithSameOrientation()) {\n // Need to adjust our scroll metrics to be relative to our containing\n // VirtualizedList before we can make claims about list item viewability\n _this.measureLayoutRelativeToContainingList();\n } else {\n _this._scrollMetrics.visibleLength = _this._selectLength(e.nativeEvent.layout);\n }\n\n _this.props.onLayout && _this.props.onLayout(e);\n\n _this._scheduleCellsToRenderUpdate();\n\n _this._maybeCallOnEndReached();\n };\n\n _this._onLayoutEmpty = function (e) {\n _this.props.onLayout && _this.props.onLayout(e);\n };\n\n _this._onLayoutFooter = function (e) {\n _this._triggerRemeasureForChildListsInCell(_this._getFooterCellKey());\n\n _this._footerLength = _this._selectLength(e.nativeEvent.layout);\n };\n\n _this._onLayoutHeader = function (e) {\n _this._headerLength = _this._selectLength(e.nativeEvent.layout);\n };\n\n _this._onContentSizeChange = function (width, height) {\n if (width > 0 && height > 0 && _this.props.initialScrollIndex != null && _this.props.initialScrollIndex > 0 && !_this._hasDoneInitialScroll) {\n _this._hasDoneInitialScroll = true;\n }\n\n if (_this.props.onContentSizeChange) {\n _this.props.onContentSizeChange(width, height);\n }\n\n _this._scrollMetrics.contentLength = _this._selectLength({\n height: height,\n width: width\n });\n\n _this._scheduleCellsToRenderUpdate();\n\n _this._maybeCallOnEndReached();\n };\n\n _this._convertParentScrollMetrics = function (metrics) {\n // Offset of the top of the nested list relative to the top of its parent's viewport\n var offset = metrics.offset - _this._offsetFromParentVirtualizedList; // Child's visible length is the same as its parent's\n\n var visibleLength = metrics.visibleLength;\n var dOffset = offset - _this._scrollMetrics.offset;\n var contentLength = _this._scrollMetrics.contentLength;\n return {\n visibleLength: visibleLength,\n contentLength: contentLength,\n offset: offset,\n dOffset: dOffset\n };\n };\n\n _this._onScroll = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onScroll(e);\n });\n\n if (_this.props.onScroll) {\n _this.props.onScroll(e);\n }\n\n var timestamp = e.timeStamp;\n\n var visibleLength = _this._selectLength(e.nativeEvent.layoutMeasurement);\n\n var contentLength = _this._selectLength(e.nativeEvent.contentSize);\n\n var offset = _this._selectOffset(e.nativeEvent.contentOffset);\n\n var dOffset = offset - _this._scrollMetrics.offset;\n\n if (_this._isNestedWithSameOrientation()) {\n if (_this._scrollMetrics.contentLength === 0) {\n // Ignore scroll events until onLayout has been called and we\n // know our offset from our offset from our parent\n return;\n }\n\n var _this$_convertParentS = _this._convertParentScrollMetrics({\n visibleLength: visibleLength,\n offset: offset\n });\n\n visibleLength = _this$_convertParentS.visibleLength;\n contentLength = _this$_convertParentS.contentLength;\n offset = _this$_convertParentS.offset;\n dOffset = _this$_convertParentS.dOffset;\n }\n\n var dt = _this._scrollMetrics.timestamp ? Math.max(1, timestamp - _this._scrollMetrics.timestamp) : 1;\n var velocity = dOffset / dt;\n\n if (dt > 500 && _this._scrollMetrics.dt > 500 && contentLength > 5 * visibleLength && !_this._hasWarned.perf) {\n infoLog('VirtualizedList: You have a large list that is slow to update - make sure your ' + 'renderItem function renders components that follow React performance best practices ' + 'like PureComponent, shouldComponentUpdate, etc.', {\n dt: dt,\n prevDt: _this._scrollMetrics.dt,\n contentLength: contentLength\n });\n _this._hasWarned.perf = true;\n }\n\n _this._scrollMetrics = {\n contentLength: contentLength,\n dt: dt,\n dOffset: dOffset,\n offset: offset,\n timestamp: timestamp,\n velocity: velocity,\n visibleLength: visibleLength\n };\n\n _this._updateViewableItems(_this.props.data);\n\n if (!_this.props) {\n return;\n }\n\n _this._maybeCallOnEndReached();\n\n if (velocity !== 0) {\n _this._fillRateHelper.activate();\n }\n\n _this._computeBlankness();\n\n _this._scheduleCellsToRenderUpdate();\n };\n\n _this._onScrollBeginDrag = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onScrollBeginDrag(e);\n });\n\n _this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.recordInteraction();\n });\n\n _this._hasInteracted = true;\n _this.props.onScrollBeginDrag && _this.props.onScrollBeginDrag(e);\n };\n\n _this._onScrollEndDrag = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onScrollEndDrag(e);\n });\n\n var velocity = e.nativeEvent.velocity;\n\n if (velocity) {\n _this._scrollMetrics.velocity = _this._selectOffset(velocity);\n }\n\n _this._computeBlankness();\n\n _this.props.onScrollEndDrag && _this.props.onScrollEndDrag(e);\n };\n\n _this._onMomentumScrollBegin = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onMomentumScrollBegin(e);\n });\n\n _this.props.onMomentumScrollBegin && _this.props.onMomentumScrollBegin(e);\n };\n\n _this._onMomentumScrollEnd = function (e) {\n _this._nestedChildLists.forEach(function (childList) {\n childList.ref && childList.ref._onMomentumScrollEnd(e);\n });\n\n _this._scrollMetrics.velocity = 0;\n\n _this._computeBlankness();\n\n _this.props.onMomentumScrollEnd && _this.props.onMomentumScrollEnd(e);\n };\n\n _this._updateCellsToRender = function () {\n var _this$props3 = _this.props,\n data = _this$props3.data,\n getItemCount = _this$props3.getItemCount,\n onEndReachedThreshold = _this$props3.onEndReachedThreshold;\n\n var isVirtualizationDisabled = _this._isVirtualizationDisabled();\n\n _this._updateViewableItems(data);\n\n if (!data) {\n return;\n }\n\n _this.setState(function (state) {\n var newState;\n var _this$_scrollMetrics = _this._scrollMetrics,\n contentLength = _this$_scrollMetrics.contentLength,\n offset = _this$_scrollMetrics.offset,\n visibleLength = _this$_scrollMetrics.visibleLength;\n\n if (!isVirtualizationDisabled) {\n // If we run this with bogus data, we'll force-render window {first: 0, last: 0},\n // and wipe out the initialNumToRender rendered elements.\n // So let's wait until the scroll view metrics have been set up. And until then,\n // we will trust the initialNumToRender suggestion\n if (visibleLength > 0 && contentLength > 0) {\n // If we have a non-zero initialScrollIndex and run this before we've scrolled,\n // we'll wipe out the initialNumToRender rendered elements starting at initialScrollIndex.\n // So let's wait until we've scrolled the view to the right place. And until then,\n // we will trust the initialScrollIndex suggestion.\n if (!_this.props.initialScrollIndex || _this._scrollMetrics.offset) {\n newState = computeWindowedRenderLimits(_this.props, state, _this._getFrameMetricsApprox, _this._scrollMetrics);\n }\n }\n } else {\n var distanceFromEnd = contentLength - visibleLength - offset;\n var renderAhead =\n /* $FlowFixMe(>=0.63.0 site=react_native_fb) This comment suppresses\n * an error found when Flow v0.63 was deployed. To see the error\n * delete this comment and run Flow. */\n distanceFromEnd < onEndReachedThreshold * visibleLength ? _this.props.maxToRenderPerBatch : 0;\n newState = {\n first: 0,\n last: Math.min(state.last + renderAhead, getItemCount(data) - 1)\n };\n }\n\n if (newState && _this._nestedChildLists.size > 0) {\n var newFirst = newState.first;\n var newLast = newState.last; // If some cell in the new state has a child list in it, we should only render\n // up through that item, so that we give that list a chance to render.\n // Otherwise there's churn from multiple child lists mounting and un-mounting\n // their items.\n\n for (var ii = newFirst; ii <= newLast; ii++) {\n var cellKeyForIndex = _this._indicesToKeys.get(ii);\n\n var childListKeys = cellKeyForIndex && _this._cellKeysToChildListKeys.get(cellKeyForIndex);\n\n if (!childListKeys) {\n continue;\n }\n\n var someChildHasMore = false; // For each cell, need to check whether any child list in it has more elements to render\n\n for (var _iterator = _createForOfIteratorHelperLoose(childListKeys), _step; !(_step = _iterator()).done;) {\n var childKey = _step.value;\n\n var childList = _this._nestedChildLists.get(childKey);\n\n if (childList && childList.ref && childList.ref.hasMore()) {\n someChildHasMore = true;\n break;\n }\n }\n\n if (someChildHasMore && newState) {\n newState.last = ii;\n break;\n }\n }\n }\n\n if (newState != null && newState.first === state.first && newState.last === state.last) {\n newState = null;\n }\n\n return newState;\n });\n };\n\n _this._createViewToken = function (index, isViewable) {\n var _this$props4 = _this.props,\n data = _this$props4.data,\n getItem = _this$props4.getItem,\n keyExtractor = _this$props4.keyExtractor;\n var item = getItem(data, index);\n return {\n index: index,\n item: item,\n key: keyExtractor(item, index),\n isViewable: isViewable\n };\n };\n\n _this._getFrameMetricsApprox = function (index) {\n var frame = _this._getFrameMetrics(index);\n\n if (frame && frame.index === index) {\n // check for invalid frames due to row re-ordering\n return frame;\n } else {\n var getItemLayout = _this.props.getItemLayout;\n invariant(!getItemLayout, 'Should not have to estimate frames when a measurement metrics function is provided');\n return {\n length: _this._averageCellLength,\n offset: _this._averageCellLength * index\n };\n }\n };\n\n _this._getFrameMetrics = function (index) {\n var _this$props5 = _this.props,\n data = _this$props5.data,\n getItem = _this$props5.getItem,\n getItemCount = _this$props5.getItemCount,\n getItemLayout = _this$props5.getItemLayout,\n keyExtractor = _this$props5.keyExtractor;\n invariant(getItemCount(data) > index, 'Tried to get frame for out of range index ' + index);\n var item = getItem(data, index);\n\n var frame = item && _this._frames[keyExtractor(item, index)];\n\n if (!frame || frame.index !== index) {\n if (getItemLayout) {\n frame = getItemLayout(data, index);\n }\n }\n /* $FlowFixMe(>=0.63.0 site=react_native_fb) This comment suppresses an\n * error found when Flow v0.63 was deployed. To see the error delete this\n * comment and run Flow. */\n\n\n return frame;\n };\n\n invariant( // $FlowFixMe\n !_props.onScroll || !_props.onScroll.__isNative, 'Components based on VirtualizedList must be wrapped with Animated.createAnimatedComponent ' + 'to support native onScroll events with useNativeDriver');\n invariant(_props.windowSize > 0, 'VirtualizedList: The windowSize prop must be present and set to a value greater than 0.');\n _this._fillRateHelper = new FillRateHelper(_this._getFrameMetrics);\n _this._updateCellsToRenderBatcher = new Batchinator(_this._updateCellsToRender, _this.props.updateCellsBatchingPeriod);\n\n if (_this.props.viewabilityConfigCallbackPairs) {\n _this._viewabilityTuples = _this.props.viewabilityConfigCallbackPairs.map(function (pair) {\n return {\n viewabilityHelper: new ViewabilityHelper(pair.viewabilityConfig),\n onViewableItemsChanged: pair.onViewableItemsChanged\n };\n });\n } else if (_this.props.onViewableItemsChanged) {\n var onViewableItemsChanged = _this.props.onViewableItemsChanged;\n\n _this._viewabilityTuples.push({\n viewabilityHelper: new ViewabilityHelper(_this.props.viewabilityConfig),\n onViewableItemsChanged: onViewableItemsChanged\n });\n }\n\n var initialState = {\n first: _this.props.initialScrollIndex || 0,\n last: Math.min(_this.props.getItemCount(_this.props.data), (_this.props.initialScrollIndex || 0) + _this.props.initialNumToRender) - 1\n };\n\n if (_this._isNestedWithSameOrientation()) {\n var storedState = _this.context.getNestedChildState(_this._getListKey());\n\n if (storedState) {\n initialState = storedState;\n _this.state = storedState;\n _this._frames = storedState.frames;\n }\n }\n\n _this.state = initialState;\n return _this;\n }\n\n _proto.componentDidMount = function componentDidMount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.registerAsNestedChild({\n cellKey: this._getCellKey(),\n key: this._getListKey(),\n ref: this,\n // NOTE: When the child mounts (here) it's not necessarily safe to read\n // the parent's props. This is why we explicitly propagate debugInfo\n // \"down\" via context and \"up\" again via this method call on the\n // parent.\n parentDebugInfo: this.context.debugInfo\n });\n }\n };\n\n _proto.componentWillUnmount = function componentWillUnmount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.unregisterAsNestedChild({\n key: this._getListKey(),\n state: {\n first: this.state.first,\n last: this.state.last,\n frames: this._frames\n }\n });\n }\n\n this._updateViewableItems(null);\n\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.dispose();\n });\n\n this._fillRateHelper.deactivateAndFlush();\n };\n\n VirtualizedList.getDerivedStateFromProps = function getDerivedStateFromProps(newProps, prevState) {\n var data = newProps.data,\n getItemCount = newProps.getItemCount,\n maxToRenderPerBatch = newProps.maxToRenderPerBatch; // first and last could be stale (e.g. if a new, shorter items props is passed in), so we make\n // sure we're rendering a reasonable range here.\n\n return {\n first: Math.max(0, Math.min(prevState.first, getItemCount(data) - 1 - maxToRenderPerBatch)),\n last: Math.max(0, Math.min(prevState.last, getItemCount(data) - 1))\n };\n };\n\n _proto._pushCells = function _pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, first, last, inversionStyle) {\n var _this2 = this;\n\n var _this$props6 = this.props,\n CellRendererComponent = _this$props6.CellRendererComponent,\n ItemSeparatorComponent = _this$props6.ItemSeparatorComponent,\n data = _this$props6.data,\n getItem = _this$props6.getItem,\n getItemCount = _this$props6.getItemCount,\n horizontal = _this$props6.horizontal,\n keyExtractor = _this$props6.keyExtractor;\n var stickyOffset = this.props.ListHeaderComponent ? 1 : 0;\n var end = getItemCount(data) - 1;\n var prevCellKey;\n last = Math.min(end, last);\n\n var _loop = function _loop(ii) {\n var item = getItem(data, ii);\n var key = keyExtractor(item, ii);\n\n _this2._indicesToKeys.set(ii, key);\n\n if (stickyIndicesFromProps.has(ii + stickyOffset)) {\n stickyHeaderIndices.push(cells.length);\n }\n\n cells.push( /*#__PURE__*/React.createElement(CellRenderer, {\n CellRendererComponent: CellRendererComponent,\n ItemSeparatorComponent: ii < end ? ItemSeparatorComponent : undefined,\n cellKey: key,\n fillRateHelper: _this2._fillRateHelper,\n horizontal: horizontal,\n index: ii,\n inversionStyle: inversionStyle,\n item: item,\n key: key,\n prevCellKey: prevCellKey,\n onUpdateSeparators: _this2._onUpdateSeparators,\n onLayout: function onLayout(e) {\n return _this2._onCellLayout(e, key, ii);\n },\n onUnmount: _this2._onCellUnmount,\n parentProps: _this2.props,\n ref: function ref(_ref) {\n _this2._cellRefs[key] = _ref;\n }\n }));\n prevCellKey = key;\n };\n\n for (var ii = first; ii <= last; ii++) {\n _loop(ii);\n }\n };\n\n _proto._isVirtualizationDisabled = function _isVirtualizationDisabled() {\n return this.props.disableVirtualization || false;\n };\n\n _proto._isNestedWithSameOrientation = function _isNestedWithSameOrientation() {\n var nestedContext = this.context;\n return !!(nestedContext && !!nestedContext.horizontal === !!this.props.horizontal);\n };\n\n _proto.render = function render() {\n var _this3 = this;\n\n if (__DEV__) {\n var flatStyles = flattenStyle(this.props.contentContainerStyle);\n\n if (flatStyles != null && flatStyles.flexWrap === 'wrap') {\n console.warn('`flexWrap: `wrap`` is not supported with the `VirtualizedList` components.' + 'Consider using `numColumns` with `FlatList` instead.');\n }\n }\n\n var _this$props7 = this.props,\n ListEmptyComponent = _this$props7.ListEmptyComponent,\n ListFooterComponent = _this$props7.ListFooterComponent,\n ListHeaderComponent = _this$props7.ListHeaderComponent;\n var _this$props8 = this.props,\n data = _this$props8.data,\n horizontal = _this$props8.horizontal;\n\n var isVirtualizationDisabled = this._isVirtualizationDisabled();\n\n var inversionStyle = this.props.inverted ? this.props.horizontal ? styles.horizontallyInverted : styles.verticallyInverted : null;\n var cells = [];\n var stickyIndicesFromProps = new Set(this.props.stickyHeaderIndices);\n var stickyHeaderIndices = [];\n\n if (ListHeaderComponent) {\n if (stickyIndicesFromProps.has(0)) {\n stickyHeaderIndices.push(0);\n }\n\n var element = /*#__PURE__*/React.isValidElement(ListHeaderComponent) ? ListHeaderComponent :\n /*#__PURE__*/\n // $FlowFixMe\n React.createElement(ListHeaderComponent, null);\n cells.push( /*#__PURE__*/React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getCellKey() + '-header',\n key: \"$header\"\n }, /*#__PURE__*/React.createElement(View, {\n onLayout: this._onLayoutHeader,\n style: StyleSheet.compose(inversionStyle, this.props.ListHeaderComponentStyle)\n }, // $FlowFixMe - Typing ReactNativeComponent revealed errors\n element)));\n }\n\n var itemCount = this.props.getItemCount(data);\n\n if (itemCount > 0) {\n _usedIndexForKey = false;\n _keylessItemComponentName = '';\n var spacerKey = !horizontal ? 'height' : 'width';\n var lastInitialIndex = this.props.initialScrollIndex ? -1 : this.props.initialNumToRender - 1;\n var _this$state = this.state,\n first = _this$state.first,\n last = _this$state.last;\n\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, 0, lastInitialIndex, inversionStyle);\n\n var firstAfterInitial = Math.max(lastInitialIndex + 1, first);\n\n if (!isVirtualizationDisabled && first > lastInitialIndex + 1) {\n var insertedStickySpacer = false;\n\n if (stickyIndicesFromProps.size > 0) {\n var stickyOffset = ListHeaderComponent ? 1 : 0; // See if there are any sticky headers in the virtualized space that we need to render.\n\n for (var ii = firstAfterInitial - 1; ii > lastInitialIndex; ii--) {\n if (stickyIndicesFromProps.has(ii + stickyOffset)) {\n var _ref2, _ref3;\n\n var initBlock = this._getFrameMetricsApprox(lastInitialIndex);\n\n var stickyBlock = this._getFrameMetricsApprox(ii);\n\n var leadSpace = stickyBlock.offset - initBlock.offset - (this.props.initialScrollIndex ? 0 : initBlock.length);\n cells.push(\n /*#__PURE__*/\n\n /* $FlowFixMe(>=0.111.0 site=react_native_fb) This comment\n * suppresses an error found when Flow v0.111 was deployed. To\n * see the error, delete this comment and run Flow. */\n React.createElement(View, {\n key: \"$sticky_lead\",\n style: (_ref2 = {}, _ref2[spacerKey] = leadSpace, _ref2)\n }));\n\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, ii, ii, inversionStyle);\n\n var trailSpace = this._getFrameMetricsApprox(first).offset - (stickyBlock.offset + stickyBlock.length);\n cells.push(\n /*#__PURE__*/\n\n /* $FlowFixMe(>=0.111.0 site=react_native_fb) This comment\n * suppresses an error found when Flow v0.111 was deployed. To\n * see the error, delete this comment and run Flow. */\n React.createElement(View, {\n key: \"$sticky_trail\",\n style: (_ref3 = {}, _ref3[spacerKey] = trailSpace, _ref3)\n }));\n insertedStickySpacer = true;\n break;\n }\n }\n }\n\n if (!insertedStickySpacer) {\n var _ref4;\n\n var _initBlock = this._getFrameMetricsApprox(lastInitialIndex);\n\n var firstSpace = this._getFrameMetricsApprox(first).offset - (_initBlock.offset + _initBlock.length);\n\n cells.push(\n /*#__PURE__*/\n\n /* $FlowFixMe(>=0.111.0 site=react_native_fb) This comment\n * suppresses an error found when Flow v0.111 was deployed. To see\n * the error, delete this comment and run Flow. */\n React.createElement(View, {\n key: \"$lead_spacer\",\n style: (_ref4 = {}, _ref4[spacerKey] = firstSpace, _ref4)\n }));\n }\n }\n\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, firstAfterInitial, last, inversionStyle);\n\n if (!this._hasWarned.keys && _usedIndexForKey) {\n console.warn('VirtualizedList: missing keys for items, make sure to specify a key or id property on each ' + 'item or provide a custom keyExtractor.', _keylessItemComponentName);\n this._hasWarned.keys = true;\n }\n\n if (!isVirtualizationDisabled && last < itemCount - 1) {\n var _ref5;\n\n var lastFrame = this._getFrameMetricsApprox(last); // Without getItemLayout, we limit our tail spacer to the _highestMeasuredFrameIndex to\n // prevent the user for hyperscrolling into un-measured area because otherwise content will\n // likely jump around as it renders in above the viewport.\n\n\n var end = this.props.getItemLayout ? itemCount - 1 : Math.min(itemCount - 1, this._highestMeasuredFrameIndex);\n\n var endFrame = this._getFrameMetricsApprox(end);\n\n var tailSpacerLength = endFrame.offset + endFrame.length - (lastFrame.offset + lastFrame.length);\n cells.push(\n /*#__PURE__*/\n\n /* $FlowFixMe(>=0.111.0 site=react_native_fb) This comment suppresses\n * an error found when Flow v0.111 was deployed. To see the error,\n * delete this comment and run Flow. */\n React.createElement(View, {\n key: \"$tail_spacer\",\n style: (_ref5 = {}, _ref5[spacerKey] = tailSpacerLength, _ref5)\n }));\n }\n } else if (ListEmptyComponent) {\n var _element = /*#__PURE__*/React.isValidElement(ListEmptyComponent) ? ListEmptyComponent :\n /*#__PURE__*/\n // $FlowFixMe\n React.createElement(ListEmptyComponent, null);\n\n cells.push( /*#__PURE__*/React.cloneElement(_element, {\n key: '$empty',\n onLayout: function onLayout(event) {\n _this3._onLayoutEmpty(event);\n\n if (_element.props.onLayout) {\n _element.props.onLayout(event);\n }\n },\n style: StyleSheet.compose(inversionStyle, _element.props.style)\n }));\n }\n\n if (ListFooterComponent) {\n var _element2 = /*#__PURE__*/React.isValidElement(ListFooterComponent) ? ListFooterComponent :\n /*#__PURE__*/\n // $FlowFixMe\n React.createElement(ListFooterComponent, null);\n\n cells.push( /*#__PURE__*/React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getFooterCellKey(),\n key: \"$footer\"\n }, /*#__PURE__*/React.createElement(View, {\n onLayout: this._onLayoutFooter,\n style: StyleSheet.compose(inversionStyle, this.props.ListFooterComponentStyle)\n }, // $FlowFixMe - Typing ReactNativeComponent revealed errors\n _element2)));\n }\n\n var scrollProps = _objectSpread(_objectSpread({}, this.props), {}, {\n onContentSizeChange: this._onContentSizeChange,\n onLayout: this._onLayout,\n onScroll: this._onScroll,\n onScrollBeginDrag: this._onScrollBeginDrag,\n onScrollEndDrag: this._onScrollEndDrag,\n onMomentumScrollBegin: this._onMomentumScrollBegin,\n onMomentumScrollEnd: this._onMomentumScrollEnd,\n scrollEventThrottle: this.props.scrollEventThrottle,\n // TODO: Android support\n stickyHeaderIndices: stickyHeaderIndices,\n style: inversionStyle ? [inversionStyle, this.props.style] : this.props.style\n });\n\n this._hasMore = this.state.last < this.props.getItemCount(this.props.data) - 1;\n var innerRet = /*#__PURE__*/React.createElement(VirtualizedListContextProvider, {\n value: {\n cellKey: null,\n getScrollMetrics: this._getScrollMetrics,\n horizontal: this.props.horizontal,\n getOutermostParentListRef: this._getOutermostParentListRef,\n getNestedChildState: this._getNestedChildState,\n registerAsNestedChild: this._registerAsNestedChild,\n unregisterAsNestedChild: this._unregisterAsNestedChild,\n debugInfo: this._getDebugInfo()\n }\n }, /*#__PURE__*/React.cloneElement((this.props.renderScrollComponent || this._defaultRenderScrollComponent)(scrollProps), {\n ref: this._captureScrollRef\n }, cells));\n var ret = innerRet;\n\n if (this.props.debug) {\n return /*#__PURE__*/React.createElement(View, {\n style: styles.debug\n }, ret, this._renderDebugOverlay());\n } else {\n return ret;\n }\n };\n\n _proto.componentDidUpdate = function componentDidUpdate(prevProps) {\n var _this$props9 = this.props,\n data = _this$props9.data,\n extraData = _this$props9.extraData;\n\n if (data !== prevProps.data || extraData !== prevProps.extraData) {\n // clear the viewableIndices cache to also trigger\n // the onViewableItemsChanged callback with the new data\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.resetViewableIndices();\n });\n } // The `this._hiPriInProgress` is guaranteeing a hiPri cell update will only happen\n // once per fiber update. The `_scheduleCellsToRenderUpdate` will set it to true\n // if a hiPri update needs to perform. If `componentDidUpdate` is triggered with\n // `this._hiPriInProgress=true`, means it's triggered by the hiPri update. The\n // `_scheduleCellsToRenderUpdate` will check this condition and not perform\n // another hiPri update.\n\n\n var hiPriInProgress = this._hiPriInProgress;\n\n this._scheduleCellsToRenderUpdate(); // Make sure setting `this._hiPriInProgress` back to false after `componentDidUpdate`\n // is triggered with `this._hiPriInProgress = true`\n\n\n if (hiPriInProgress) {\n this._hiPriInProgress = false;\n }\n };\n\n _proto._computeBlankness = function _computeBlankness() {\n this._fillRateHelper.computeBlankness(this.props, this.state, this._scrollMetrics);\n };\n\n _proto._onCellLayout = function _onCellLayout(e, cellKey, index) {\n var layout = e.nativeEvent.layout;\n var next = {\n offset: this._selectOffset(layout),\n length: this._selectLength(layout),\n index: index,\n inLayout: true\n };\n var curr = this._frames[cellKey];\n\n if (!curr || next.offset !== curr.offset || next.length !== curr.length || index !== curr.index) {\n this._totalCellLength += next.length - (curr ? curr.length : 0);\n this._totalCellsMeasured += curr ? 0 : 1;\n this._averageCellLength = this._totalCellLength / this._totalCellsMeasured;\n this._frames[cellKey] = next;\n this._highestMeasuredFrameIndex = Math.max(this._highestMeasuredFrameIndex, index);\n\n this._scheduleCellsToRenderUpdate();\n } else {\n this._frames[cellKey].inLayout = true;\n }\n\n this._triggerRemeasureForChildListsInCell(cellKey);\n\n this._computeBlankness();\n\n this._updateViewableItems(this.props.data);\n };\n\n _proto._triggerRemeasureForChildListsInCell = function _triggerRemeasureForChildListsInCell(cellKey) {\n var childListKeys = this._cellKeysToChildListKeys.get(cellKey);\n\n if (childListKeys) {\n for (var _iterator2 = _createForOfIteratorHelperLoose(childListKeys), _step2; !(_step2 = _iterator2()).done;) {\n var childKey = _step2.value;\n\n var childList = this._nestedChildLists.get(childKey);\n\n childList && childList.ref && childList.ref.measureLayoutRelativeToContainingList();\n }\n }\n };\n\n _proto.measureLayoutRelativeToContainingList = function measureLayoutRelativeToContainingList() {\n var _this4 = this;\n\n // TODO (T35574538): findNodeHandle sometimes crashes with \"Unable to find\n // node on an unmounted component\" during scrolling\n try {\n if (!this._scrollRef) {\n return;\n } // We are assuming that getOutermostParentListRef().getScrollRef()\n // is a non-null reference to a ScrollView\n\n\n this._scrollRef.measureLayout(this.context.getOutermostParentListRef().getScrollRef(), function (x, y, width, height) {\n _this4._offsetFromParentVirtualizedList = _this4._selectOffset({\n x: x,\n y: y\n });\n _this4._scrollMetrics.contentLength = _this4._selectLength({\n width: width,\n height: height\n });\n\n var scrollMetrics = _this4._convertParentScrollMetrics(_this4.context.getScrollMetrics());\n\n _this4._scrollMetrics.visibleLength = scrollMetrics.visibleLength;\n _this4._scrollMetrics.offset = scrollMetrics.offset;\n }, function (error) {\n console.warn(\"VirtualizedList: Encountered an error while measuring a list's\" + ' offset from its containing VirtualizedList.');\n });\n } catch (error) {\n console.warn('measureLayoutRelativeToContainingList threw an error', error.stack);\n }\n };\n\n _proto._getFooterCellKey = function _getFooterCellKey() {\n return this._getCellKey() + '-footer';\n };\n\n _proto._renderDebugOverlay = function _renderDebugOverlay() {\n var normalize = this._scrollMetrics.visibleLength / (this._scrollMetrics.contentLength || 1);\n var framesInLayout = [];\n var itemCount = this.props.getItemCount(this.props.data);\n\n for (var ii = 0; ii < itemCount; ii++) {\n var frame = this._getFrameMetricsApprox(ii);\n /* $FlowFixMe(>=0.68.0 site=react_native_fb) This comment suppresses an\n * error found when Flow v0.68 was deployed. To see the error delete this\n * comment and run Flow. */\n\n\n if (frame.inLayout) {\n framesInLayout.push(frame);\n }\n }\n\n var windowTop = this._getFrameMetricsApprox(this.state.first).offset;\n\n var frameLast = this._getFrameMetricsApprox(this.state.last);\n\n var windowLen = frameLast.offset + frameLast.length - windowTop;\n var visTop = this._scrollMetrics.offset;\n var visLen = this._scrollMetrics.visibleLength;\n return /*#__PURE__*/React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlay]\n }, framesInLayout.map(function (f, ii) {\n return /*#__PURE__*/React.createElement(View, {\n key: 'f' + ii,\n style: [styles.debugOverlayBase, styles.debugOverlayFrame, {\n top: f.offset * normalize,\n height: f.length * normalize\n }]\n });\n }), /*#__PURE__*/React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlayFrameLast, {\n top: windowTop * normalize,\n height: windowLen * normalize\n }]\n }), /*#__PURE__*/React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlayFrameVis, {\n top: visTop * normalize,\n height: visLen * normalize\n }]\n }));\n };\n\n _proto._selectLength = function _selectLength(metrics) {\n return !this.props.horizontal ? metrics.height : metrics.width;\n };\n\n _proto._selectOffset = function _selectOffset(metrics) {\n return !this.props.horizontal ? metrics.y : metrics.x;\n };\n\n _proto._maybeCallOnEndReached = function _maybeCallOnEndReached() {\n var _this$props10 = this.props,\n data = _this$props10.data,\n getItemCount = _this$props10.getItemCount,\n onEndReached = _this$props10.onEndReached,\n onEndReachedThreshold = _this$props10.onEndReachedThreshold;\n var _this$_scrollMetrics2 = this._scrollMetrics,\n contentLength = _this$_scrollMetrics2.contentLength,\n visibleLength = _this$_scrollMetrics2.visibleLength,\n offset = _this$_scrollMetrics2.offset;\n var distanceFromEnd = contentLength - visibleLength - offset;\n var threshold = onEndReachedThreshold ? onEndReachedThreshold * visibleLength : 2;\n\n if (onEndReached && this.state.last === getItemCount(data) - 1 && distanceFromEnd < threshold && this._scrollMetrics.contentLength !== this._sentEndForContentLength) {\n // Only call onEndReached once for a given content length\n this._sentEndForContentLength = this._scrollMetrics.contentLength;\n onEndReached({\n distanceFromEnd: distanceFromEnd\n });\n } else if (distanceFromEnd > threshold) {\n // If the user scrolls away from the end and back again cause\n // an onEndReached to be triggered again\n this._sentEndForContentLength = 0;\n }\n };\n\n _proto._scheduleCellsToRenderUpdate = function _scheduleCellsToRenderUpdate() {\n var _this$state2 = this.state,\n first = _this$state2.first,\n last = _this$state2.last;\n var _this$_scrollMetrics3 = this._scrollMetrics,\n offset = _this$_scrollMetrics3.offset,\n visibleLength = _this$_scrollMetrics3.visibleLength,\n velocity = _this$_scrollMetrics3.velocity;\n var itemCount = this.props.getItemCount(this.props.data);\n var hiPri = false;\n var scrollingThreshold =\n /* $FlowFixMe(>=0.63.0 site=react_native_fb) This comment suppresses an\n * error found when Flow v0.63 was deployed. To see the error delete\n * this comment and run Flow. */\n this.props.onEndReachedThreshold * visibleLength / 2; // Mark as high priority if we're close to the start of the first item\n // But only if there are items before the first rendered item\n\n if (first > 0) {\n var distTop = offset - this._getFrameMetricsApprox(first).offset;\n\n hiPri = hiPri || distTop < 0 || velocity < -2 && distTop < scrollingThreshold;\n } // Mark as high priority if we're close to the end of the last item\n // But only if there are items after the last rendered item\n\n\n if (last < itemCount - 1) {\n var distBottom = this._getFrameMetricsApprox(last).offset - (offset + visibleLength);\n hiPri = hiPri || distBottom < 0 || velocity > 2 && distBottom < scrollingThreshold;\n } // Only trigger high-priority updates if we've actually rendered cells,\n // and with that size estimate, accurately compute how many cells we should render.\n // Otherwise, it would just render as many cells as it can (of zero dimension),\n // each time through attempting to render more (limited by maxToRenderPerBatch),\n // starving the renderer from actually laying out the objects and computing _averageCellLength.\n // If this is triggered in an `componentDidUpdate` followed by a hiPri cellToRenderUpdate\n // We shouldn't do another hipri cellToRenderUpdate\n\n\n if (hiPri && (this._averageCellLength || this.props.getItemLayout) && !this._hiPriInProgress) {\n this._hiPriInProgress = true; // Don't worry about interactions when scrolling quickly; focus on filling content as fast\n // as possible.\n\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n\n this._updateCellsToRender();\n\n return;\n } else {\n this._updateCellsToRenderBatcher.schedule();\n }\n };\n\n _proto._updateViewableItems = function _updateViewableItems(data) {\n var _this5 = this;\n\n var getItemCount = this.props.getItemCount;\n\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.onUpdate(getItemCount(data), _this5._scrollMetrics.offset, _this5._scrollMetrics.visibleLength, _this5._getFrameMetrics, _this5._createViewToken, tuple.onViewableItemsChanged, _this5.state);\n });\n };\n\n return VirtualizedList;\n}(React.PureComponent);\n\nVirtualizedList.contextType = VirtualizedListContext;\nVirtualizedList.defaultProps = {\n disableVirtualization: false,\n horizontal: false,\n initialNumToRender: 10,\n keyExtractor: function keyExtractor(item, index) {\n if (item.key != null) {\n return item.key;\n }\n\n if (item.id != null) {\n return item.id;\n }\n\n _usedIndexForKey = true;\n\n if (item.type && item.type.displayName) {\n _keylessItemComponentName = item.type.displayName;\n }\n\n return String(index);\n },\n maxToRenderPerBatch: 10,\n onEndReachedThreshold: 2,\n // multiples of length\n scrollEventThrottle: 50,\n updateCellsBatchingPeriod: 50,\n windowSize: 21 // multiples of length\n\n};\n\nvar CellRenderer = /*#__PURE__*/function (_React$Component) {\n _inheritsLoose(CellRenderer, _React$Component);\n\n function CellRenderer() {\n var _this6;\n\n for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n args[_key] = arguments[_key];\n }\n\n _this6 = _React$Component.call.apply(_React$Component, [this].concat(args)) || this;\n _this6.state = {\n separatorProps: {\n highlighted: false,\n leadingItem: _this6.props.item\n }\n };\n _this6._separators = {\n highlight: function highlight() {\n var _this6$props = _this6.props,\n cellKey = _this6$props.cellKey,\n prevCellKey = _this6$props.prevCellKey;\n\n _this6.props.onUpdateSeparators([cellKey, prevCellKey], {\n highlighted: true\n });\n },\n unhighlight: function unhighlight() {\n var _this6$props2 = _this6.props,\n cellKey = _this6$props2.cellKey,\n prevCellKey = _this6$props2.prevCellKey;\n\n _this6.props.onUpdateSeparators([cellKey, prevCellKey], {\n highlighted: false\n });\n },\n updateProps: function updateProps(select, newProps) {\n var _this6$props3 = _this6.props,\n cellKey = _this6$props3.cellKey,\n prevCellKey = _this6$props3.prevCellKey;\n\n _this6.props.onUpdateSeparators([select === 'leading' ? prevCellKey : cellKey], newProps);\n }\n };\n return _this6;\n }\n\n CellRenderer.getDerivedStateFromProps = function getDerivedStateFromProps(props, prevState) {\n return {\n separatorProps: _objectSpread(_objectSpread({}, prevState.separatorProps), {}, {\n leadingItem: props.item\n })\n };\n } // TODO: consider factoring separator stuff out of VirtualizedList into FlatList since it's not\n // reused by SectionList and we can keep VirtualizedList simpler.\n ;\n\n var _proto2 = CellRenderer.prototype;\n\n _proto2.updateSeparatorProps = function updateSeparatorProps(newProps) {\n this.setState(function (state) {\n return {\n separatorProps: _objectSpread(_objectSpread({}, state.separatorProps), newProps)\n };\n });\n };\n\n _proto2.componentWillUnmount = function componentWillUnmount() {\n this.props.onUnmount(this.props.cellKey);\n };\n\n _proto2._renderElement = function _renderElement(renderItem, ListItemComponent, item, index) {\n if (renderItem && ListItemComponent) {\n console.warn('VirtualizedList: Both ListItemComponent and renderItem props are present. ListItemComponent will take' + ' precedence over renderItem.');\n }\n\n if (ListItemComponent) {\n /* $FlowFixMe(>=0.108.0 site=react_native_fb) This comment suppresses an\n * error found when Flow v0.108 was deployed. To see the error, delete\n * this comment and run Flow. */\n return /*#__PURE__*/React.createElement(ListItemComponent, {\n item: item,\n index: index,\n separators: this._separators\n });\n }\n\n if (renderItem) {\n return renderItem({\n item: item,\n index: index,\n separators: this._separators\n });\n }\n\n invariant(false, 'VirtualizedList: Either ListItemComponent or renderItem props are required but none were found.');\n };\n\n _proto2.render = function render() {\n var _this$props11 = this.props,\n CellRendererComponent = _this$props11.CellRendererComponent,\n ItemSeparatorComponent = _this$props11.ItemSeparatorComponent,\n fillRateHelper = _this$props11.fillRateHelper,\n horizontal = _this$props11.horizontal,\n item = _this$props11.item,\n index = _this$props11.index,\n inversionStyle = _this$props11.inversionStyle,\n parentProps = _this$props11.parentProps;\n var renderItem = parentProps.renderItem,\n getItemLayout = parentProps.getItemLayout,\n ListItemComponent = parentProps.ListItemComponent;\n\n var element = this._renderElement(renderItem, ListItemComponent, item, index);\n\n var onLayout =\n /* $FlowFixMe(>=0.68.0 site=react_native_fb) This comment suppresses an\n * error found when Flow v0.68 was deployed. To see the error delete this\n * comment and run Flow. */\n getItemLayout && !parentProps.debug && !fillRateHelper.enabled() ? undefined : this.props.onLayout; // NOTE: that when this is a sticky header, `onLayout` will get automatically extracted and\n // called explicitly by `ScrollViewStickyHeader`.\n\n var itemSeparator = ItemSeparatorComponent && /*#__PURE__*/React.createElement(ItemSeparatorComponent, this.state.separatorProps);\n var cellStyle = inversionStyle ? horizontal ? [styles.rowReverse, inversionStyle] : [styles.columnReverse, inversionStyle] : horizontal ? [styles.row, inversionStyle] : inversionStyle;\n var result = !CellRendererComponent ?\n /*#__PURE__*/\n\n /* $FlowFixMe(>=0.89.0 site=react_native_fb) This comment suppresses an\n * error found when Flow v0.89 was deployed. To see the error, delete\n * this comment and run Flow. */\n React.createElement(View, {\n style: cellStyle,\n onLayout: onLayout\n }, element, itemSeparator) : /*#__PURE__*/React.createElement(CellRendererComponent, _extends({}, this.props, {\n style: cellStyle,\n onLayout: onLayout\n }), element, itemSeparator);\n return /*#__PURE__*/React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this.props.cellKey\n }, result);\n };\n\n return CellRenderer;\n}(React.Component);\n\nfunction describeNestedLists(childList) {\n var trace = 'VirtualizedList trace:\\n' + (\" Child (\" + (childList.horizontal ? 'horizontal' : 'vertical') + \"):\\n\") + (\" listKey: \" + childList.key + \"\\n\") + (\" cellKey: \" + childList.cellKey);\n var debugInfo = childList.parentDebugInfo;\n\n while (debugInfo) {\n trace += \"\\n Parent (\" + (debugInfo.horizontal ? 'horizontal' : 'vertical') + \"):\\n\" + (\" listKey: \" + debugInfo.listKey + \"\\n\") + (\" cellKey: \" + debugInfo.cellKey);\n debugInfo = debugInfo.parent;\n }\n\n return trace;\n}\n\nvar styles = StyleSheet.create({\n verticallyInverted: {\n transform: [{\n scaleY: -1\n }]\n },\n horizontallyInverted: {\n transform: [{\n scaleX: -1\n }]\n },\n row: {\n flexDirection: 'row'\n },\n rowReverse: {\n flexDirection: 'row-reverse'\n },\n columnReverse: {\n flexDirection: 'column-reverse'\n },\n debug: {\n flex: 1\n },\n debugOverlayBase: {\n position: 'absolute',\n top: 0,\n right: 0\n },\n debugOverlay: {\n bottom: 0,\n width: 20,\n borderColor: 'blue',\n borderWidth: 1\n },\n debugOverlayFrame: {\n left: 0,\n backgroundColor: 'orange'\n },\n debugOverlayFrameLast: {\n left: 0,\n borderColor: 'green',\n borderWidth: 2\n },\n debugOverlayFrameVis: {\n left: 0,\n borderColor: 'red',\n borderWidth: 2\n }\n});\nexport default VirtualizedList;"]},"metadata":{},"sourceType":"module"}