{"ast":null,"code":"import _toConsumableArray from \"@babel/runtime/helpers/toConsumableArray\";\nimport _defineProperty from \"@babel/runtime/helpers/defineProperty\";\nimport _classCallCheck from \"@babel/runtime/helpers/classCallCheck\";\nimport _createClass from \"@babel/runtime/helpers/createClass\";\nimport _possibleConstructorReturn from \"@babel/runtime/helpers/possibleConstructorReturn\";\nimport _getPrototypeOf from \"@babel/runtime/helpers/getPrototypeOf\";\nimport _inherits from \"@babel/runtime/helpers/inherits\";\nfunction _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }\nfunction _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }\nimport _createForOfIteratorHelperLoose from \"@babel/runtime/helpers/createForOfIteratorHelperLoose\";\nimport _extends from \"@babel/runtime/helpers/extends\";\nimport _objectSpread from \"@babel/runtime/helpers/objectSpread2\";\nimport RefreshControl from \"../../../exports/RefreshControl\";\nimport ScrollView from \"../../../exports/ScrollView\";\nimport View from \"../../../exports/View\";\nimport StyleSheet from \"../../../exports/StyleSheet\";\nimport findNodeHandle from \"../../../exports/findNodeHandle\";\nimport Batchinator from \"../Batchinator\";\nimport clamp from \"../Utilities/clamp\";\nimport infoLog from \"../infoLog\";\nimport { CellRenderMask } from \"./CellRenderMask\";\nimport ChildListCollection from \"./ChildListCollection\";\nimport FillRateHelper from \"../FillRateHelper\";\nimport StateSafePureComponent from \"./StateSafePureComponent\";\nimport ViewabilityHelper from \"../ViewabilityHelper\";\nimport CellRenderer from \"./VirtualizedListCellRenderer\";\nimport { VirtualizedListCellContextProvider, VirtualizedListContext, VirtualizedListContextProvider } from \"./VirtualizedListContext.js\";\nimport { computeWindowedRenderLimits, keyExtractor as defaultKeyExtractor } from \"../VirtualizeUtils\";\nimport invariant from 'fbjs/lib/invariant';\nimport nullthrows from 'nullthrows';\nimport * as React from 'react';\nvar __DEV__ = process.env.NODE_ENV !== 'production';\nvar ON_EDGE_REACHED_EPSILON = 0.001;\nvar _usedIndexForKey = false;\nvar _keylessItemComponentName = '';\nfunction horizontalOrDefault(horizontal) {\n return horizontal !== null && horizontal !== void 0 ? horizontal : false;\n}\nfunction initialNumToRenderOrDefault(initialNumToRender) {\n return initialNumToRender !== null && initialNumToRender !== void 0 ? initialNumToRender : 10;\n}\nfunction maxToRenderPerBatchOrDefault(maxToRenderPerBatch) {\n return maxToRenderPerBatch !== null && maxToRenderPerBatch !== void 0 ? maxToRenderPerBatch : 10;\n}\nfunction onStartReachedThresholdOrDefault(onStartReachedThreshold) {\n return onStartReachedThreshold !== null && onStartReachedThreshold !== void 0 ? onStartReachedThreshold : 2;\n}\nfunction onEndReachedThresholdOrDefault(onEndReachedThreshold) {\n return onEndReachedThreshold !== null && onEndReachedThreshold !== void 0 ? onEndReachedThreshold : 2;\n}\nfunction getScrollingThreshold(threshold, visibleLength) {\n return threshold * visibleLength / 2;\n}\nfunction scrollEventThrottleOrDefault(scrollEventThrottle) {\n return scrollEventThrottle !== null && scrollEventThrottle !== void 0 ? scrollEventThrottle : 50;\n}\nfunction windowSizeOrDefault(windowSize) {\n return windowSize !== null && windowSize !== void 0 ? windowSize : 21;\n}\nfunction findLastWhere(arr, predicate) {\n for (var i = arr.length - 1; i >= 0; i--) {\n if (predicate(arr[i])) {\n return arr[i];\n }\n }\n return null;\n}\nvar VirtualizedList = function (_StateSafePureCompone) {\n function VirtualizedList(_props) {\n var _this2;\n _classCallCheck(this, VirtualizedList);\n var _this$props$updateCel;\n _this2 = _callSuper(this, VirtualizedList, [_props]);\n _this2._getScrollMetrics = function () {\n return _this2._scrollMetrics;\n };\n _this2._getOutermostParentListRef = function () {\n if (_this2._isNestedWithSameOrientation()) {\n return _this2.context.getOutermostParentListRef();\n } else {\n return _this2;\n }\n };\n _this2._registerAsNestedChild = function (childList) {\n _this2._nestedChildLists.add(childList.ref, childList.cellKey);\n if (_this2._hasInteracted) {\n childList.ref.recordInteraction();\n }\n };\n _this2._unregisterAsNestedChild = function (childList) {\n _this2._nestedChildLists.remove(childList.ref);\n };\n _this2._onUpdateSeparators = function (keys, newProps) {\n keys.forEach(function (key) {\n var ref = key != null && _this2._cellRefs[key];\n ref && ref.updateSeparatorProps(newProps);\n });\n };\n _this2._getSpacerKey = function (isVertical) {\n return isVertical ? 'height' : 'width';\n };\n _this2._averageCellLength = 0;\n _this2._cellRefs = {};\n _this2._frames = {};\n _this2._footerLength = 0;\n _this2._hasTriggeredInitialScrollToIndex = false;\n _this2._hasInteracted = false;\n _this2._hasMore = false;\n _this2._hasWarned = {};\n _this2._headerLength = 0;\n _this2._hiPriInProgress = false;\n _this2._highestMeasuredFrameIndex = 0;\n _this2._indicesToKeys = new Map();\n _this2._lastFocusedCellKey = null;\n _this2._nestedChildLists = new ChildListCollection();\n _this2._offsetFromParentVirtualizedList = 0;\n _this2._prevParentOffset = 0;\n _this2._scrollMetrics = {\n contentLength: 0,\n dOffset: 0,\n dt: 10,\n offset: 0,\n timestamp: 0,\n velocity: 0,\n visibleLength: 0,\n zoomScale: 1\n };\n _this2._scrollRef = null;\n _this2._sentStartForContentLength = 0;\n _this2._sentEndForContentLength = 0;\n _this2._totalCellLength = 0;\n _this2._totalCellsMeasured = 0;\n _this2._viewabilityTuples = [];\n _this2._captureScrollRef = function (ref) {\n _this2._scrollRef = ref;\n };\n _this2._defaultRenderScrollComponent = function (props) {\n var onRefresh = props.onRefresh;\n if (_this2._isNestedWithSameOrientation()) {\n return React.createElement(View, props);\n } else if (onRefresh) {\n var _props$refreshing;\n invariant(typeof props.refreshing === 'boolean', '`refreshing` prop must be set as a boolean in order to use `onRefresh`, but got `' + JSON.stringify((_props$refreshing = props.refreshing) !== null && _props$refreshing !== void 0 ? _props$refreshing : 'undefined') + '`');\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 );\n } else {\n return React.createElement(ScrollView, props);\n }\n };\n _this2._onCellLayout = function (e, cellKey, index) {\n var layout = e.nativeEvent.layout;\n var next = {\n offset: _this2._selectOffset(layout),\n length: _this2._selectLength(layout),\n index: index,\n inLayout: true\n };\n var curr = _this2._frames[cellKey];\n if (!curr || next.offset !== curr.offset || next.length !== curr.length || index !== curr.index) {\n _this2._totalCellLength += next.length - (curr ? curr.length : 0);\n _this2._totalCellsMeasured += curr ? 0 : 1;\n _this2._averageCellLength = _this2._totalCellLength / _this2._totalCellsMeasured;\n _this2._frames[cellKey] = next;\n _this2._highestMeasuredFrameIndex = Math.max(_this2._highestMeasuredFrameIndex, index);\n _this2._scheduleCellsToRenderUpdate();\n } else {\n _this2._frames[cellKey].inLayout = true;\n }\n _this2._triggerRemeasureForChildListsInCell(cellKey);\n _this2._computeBlankness();\n _this2._updateViewableItems(_this2.props, _this2.state.cellsAroundViewport);\n };\n _this2._onCellUnmount = function (cellKey) {\n delete _this2._cellRefs[cellKey];\n var curr = _this2._frames[cellKey];\n if (curr) {\n _this2._frames[cellKey] = _objectSpread(_objectSpread({}, curr), {}, {\n inLayout: false\n });\n }\n };\n _this2._onLayout = function (e) {\n if (_this2._isNestedWithSameOrientation()) {\n _this2.measureLayoutRelativeToContainingList();\n } else {\n _this2._scrollMetrics.visibleLength = _this2._selectLength(e.nativeEvent.layout);\n }\n _this2.props.onLayout && _this2.props.onLayout(e);\n _this2._scheduleCellsToRenderUpdate();\n _this2._maybeCallOnEdgeReached();\n };\n _this2._onLayoutEmpty = function (e) {\n _this2.props.onLayout && _this2.props.onLayout(e);\n };\n _this2._onLayoutFooter = function (e) {\n _this2._triggerRemeasureForChildListsInCell(_this2._getFooterCellKey());\n _this2._footerLength = _this2._selectLength(e.nativeEvent.layout);\n };\n _this2._onLayoutHeader = function (e) {\n _this2._headerLength = _this2._selectLength(e.nativeEvent.layout);\n };\n _this2._onContentSizeChange = function (width, height) {\n if (width > 0 && height > 0 && _this2.props.initialScrollIndex != null && _this2.props.initialScrollIndex > 0 && !_this2._hasTriggeredInitialScrollToIndex) {\n if (_this2.props.contentOffset == null) {\n if (_this2.props.initialScrollIndex < _this2.props.getItemCount(_this2.props.data)) {\n _this2.scrollToIndex({\n animated: false,\n index: nullthrows(_this2.props.initialScrollIndex)\n });\n } else {\n _this2.scrollToEnd({\n animated: false\n });\n }\n }\n _this2._hasTriggeredInitialScrollToIndex = true;\n }\n if (_this2.props.onContentSizeChange) {\n _this2.props.onContentSizeChange(width, height);\n }\n _this2._scrollMetrics.contentLength = _this2._selectLength({\n height: height,\n width: width\n });\n _this2._scheduleCellsToRenderUpdate();\n _this2._maybeCallOnEdgeReached();\n };\n _this2._convertParentScrollMetrics = function (metrics) {\n var offset = metrics.offset - _this2._offsetFromParentVirtualizedList;\n var visibleLength = metrics.visibleLength;\n var dOffset = offset - _this2._scrollMetrics.offset;\n var contentLength = _this2._scrollMetrics.contentLength;\n return {\n visibleLength: visibleLength,\n contentLength: contentLength,\n offset: offset,\n dOffset: dOffset\n };\n };\n _this2._onScroll = function (e) {\n _this2._nestedChildLists.forEach(function (childList) {\n childList._onScroll(e);\n });\n if (_this2.props.onScroll) {\n _this2.props.onScroll(e);\n }\n var timestamp = e.timeStamp;\n var visibleLength = _this2._selectLength(e.nativeEvent.layoutMeasurement);\n var contentLength = _this2._selectLength(e.nativeEvent.contentSize);\n var offset = _this2._selectOffset(e.nativeEvent.contentOffset);\n var dOffset = offset - _this2._scrollMetrics.offset;\n if (_this2._isNestedWithSameOrientation()) {\n if (_this2._scrollMetrics.contentLength === 0) {\n return;\n }\n var _this$_convertParentS = _this2._convertParentScrollMetrics({\n visibleLength: visibleLength,\n offset: offset\n });\n visibleLength = _this$_convertParentS.visibleLength;\n contentLength = _this$_convertParentS.contentLength;\n offset = _this$_convertParentS.offset;\n dOffset = _this$_convertParentS.dOffset;\n }\n var dt = _this2._scrollMetrics.timestamp ? Math.max(1, timestamp - _this2._scrollMetrics.timestamp) : 1;\n var velocity = dOffset / dt;\n if (dt > 500 && _this2._scrollMetrics.dt > 500 && contentLength > 5 * visibleLength && !_this2._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: _this2._scrollMetrics.dt,\n contentLength: contentLength\n });\n _this2._hasWarned.perf = true;\n }\n var zoomScale = e.nativeEvent.zoomScale < 0 ? 1 : e.nativeEvent.zoomScale;\n _this2._scrollMetrics = {\n contentLength: contentLength,\n dt: dt,\n dOffset: dOffset,\n offset: offset,\n timestamp: timestamp,\n velocity: velocity,\n visibleLength: visibleLength,\n zoomScale: zoomScale\n };\n _this2._updateViewableItems(_this2.props, _this2.state.cellsAroundViewport);\n if (!_this2.props) {\n return;\n }\n _this2._maybeCallOnEdgeReached();\n if (velocity !== 0) {\n _this2._fillRateHelper.activate();\n }\n _this2._computeBlankness();\n _this2._scheduleCellsToRenderUpdate();\n };\n _this2._onScrollBeginDrag = function (e) {\n _this2._nestedChildLists.forEach(function (childList) {\n childList._onScrollBeginDrag(e);\n });\n _this2._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.recordInteraction();\n });\n _this2._hasInteracted = true;\n _this2.props.onScrollBeginDrag && _this2.props.onScrollBeginDrag(e);\n };\n _this2._onScrollEndDrag = function (e) {\n _this2._nestedChildLists.forEach(function (childList) {\n childList._onScrollEndDrag(e);\n });\n var velocity = e.nativeEvent.velocity;\n if (velocity) {\n _this2._scrollMetrics.velocity = _this2._selectOffset(velocity);\n }\n _this2._computeBlankness();\n _this2.props.onScrollEndDrag && _this2.props.onScrollEndDrag(e);\n };\n _this2._onMomentumScrollBegin = function (e) {\n _this2._nestedChildLists.forEach(function (childList) {\n childList._onMomentumScrollBegin(e);\n });\n _this2.props.onMomentumScrollBegin && _this2.props.onMomentumScrollBegin(e);\n };\n _this2._onMomentumScrollEnd = function (e) {\n _this2._nestedChildLists.forEach(function (childList) {\n childList._onMomentumScrollEnd(e);\n });\n _this2._scrollMetrics.velocity = 0;\n _this2._computeBlankness();\n _this2.props.onMomentumScrollEnd && _this2.props.onMomentumScrollEnd(e);\n };\n _this2._updateCellsToRender = function () {\n _this2._updateViewableItems(_this2.props, _this2.state.cellsAroundViewport);\n _this2.setState(function (state, props) {\n var cellsAroundViewport = _this2._adjustCellsAroundViewport(props, state.cellsAroundViewport);\n var renderMask = VirtualizedList._createRenderMask(props, cellsAroundViewport, _this2._getNonViewportRenderRegions(props));\n if (cellsAroundViewport.first === state.cellsAroundViewport.first && cellsAroundViewport.last === state.cellsAroundViewport.last && renderMask.equals(state.renderMask)) {\n return null;\n }\n return {\n cellsAroundViewport: cellsAroundViewport,\n renderMask: renderMask\n };\n });\n };\n _this2._createViewToken = function (index, isViewable, props) {\n var data = props.data,\n getItem = props.getItem;\n var item = getItem(data, index);\n return {\n index: index,\n item: item,\n key: _this2._keyExtractor(item, index, props),\n isViewable: isViewable\n };\n };\n _this2._getOffsetApprox = function (index, props) {\n if (Number.isInteger(index)) {\n return _this2.__getFrameMetricsApprox(index, props).offset;\n } else {\n var frameMetrics = _this2.__getFrameMetricsApprox(Math.floor(index), props);\n var remainder = index - Math.floor(index);\n return frameMetrics.offset + remainder * frameMetrics.length;\n }\n };\n _this2.__getFrameMetricsApprox = function (index, props) {\n var frame = _this2._getFrameMetrics(index, props);\n if (frame && frame.index === index) {\n return frame;\n } else {\n var data = props.data,\n getItemCount = props.getItemCount,\n getItemLayout = props.getItemLayout;\n invariant(index >= 0 && index < getItemCount(data), 'Tried to get frame for out of range index ' + index);\n invariant(!getItemLayout, 'Should not have to estimate frames when a measurement metrics function is provided');\n return {\n length: _this2._averageCellLength,\n offset: _this2._averageCellLength * index\n };\n }\n };\n _this2._getFrameMetrics = function (index, props) {\n var data = props.data,\n getItem = props.getItem,\n getItemCount = props.getItemCount,\n getItemLayout = props.getItemLayout;\n invariant(index >= 0 && index < getItemCount(data), 'Tried to get frame for out of range index ' + index);\n var item = getItem(data, index);\n var frame = _this2._frames[_this2._keyExtractor(item, index, props)];\n if (!frame || frame.index !== index) {\n if (getItemLayout) {\n return getItemLayout(data, index);\n }\n }\n return frame;\n };\n _this2._getNonViewportRenderRegions = function (props) {\n if (!(_this2._lastFocusedCellKey && _this2._cellRefs[_this2._lastFocusedCellKey])) {\n return [];\n }\n var lastFocusedCellRenderer = _this2._cellRefs[_this2._lastFocusedCellKey];\n var focusedCellIndex = lastFocusedCellRenderer.props.index;\n var itemCount = props.getItemCount(props.data);\n if (focusedCellIndex >= itemCount || _this2._keyExtractor(props.getItem(props.data, focusedCellIndex), focusedCellIndex, props) !== _this2._lastFocusedCellKey) {\n return [];\n }\n var first = focusedCellIndex;\n var heightOfCellsBeforeFocused = 0;\n for (var i = first - 1; i >= 0 && heightOfCellsBeforeFocused < _this2._scrollMetrics.visibleLength; i--) {\n first--;\n heightOfCellsBeforeFocused += _this2.__getFrameMetricsApprox(i, props).length;\n }\n var last = focusedCellIndex;\n var heightOfCellsAfterFocused = 0;\n for (var _i = last + 1; _i < itemCount && heightOfCellsAfterFocused < _this2._scrollMetrics.visibleLength; _i++) {\n last++;\n heightOfCellsAfterFocused += _this2.__getFrameMetricsApprox(_i, props).length;\n }\n return [{\n first: first,\n last: last\n }];\n };\n _this2._checkProps(_props);\n _this2._fillRateHelper = new FillRateHelper(_this2._getFrameMetrics);\n _this2._updateCellsToRenderBatcher = new Batchinator(_this2._updateCellsToRender, (_this$props$updateCel = _this2.props.updateCellsBatchingPeriod) !== null && _this$props$updateCel !== void 0 ? _this$props$updateCel : 50);\n if (_this2.props.viewabilityConfigCallbackPairs) {\n _this2._viewabilityTuples = _this2.props.viewabilityConfigCallbackPairs.map(function (pair) {\n return {\n viewabilityHelper: new ViewabilityHelper(pair.viewabilityConfig),\n onViewableItemsChanged: pair.onViewableItemsChanged\n };\n });\n } else {\n var _this$props3 = _this2.props,\n onViewableItemsChanged = _this$props3.onViewableItemsChanged,\n viewabilityConfig = _this$props3.viewabilityConfig;\n if (onViewableItemsChanged) {\n _this2._viewabilityTuples.push({\n viewabilityHelper: new ViewabilityHelper(viewabilityConfig),\n onViewableItemsChanged: onViewableItemsChanged\n });\n }\n }\n var initialRenderRegion = VirtualizedList._initialRenderRegion(_props);\n _this2.state = {\n cellsAroundViewport: initialRenderRegion,\n renderMask: VirtualizedList._createRenderMask(_props, initialRenderRegion)\n };\n _this2.invertedWheelEventHandler = function (ev) {\n var scrollOffset = _this2.props.horizontal ? ev.target.scrollLeft : ev.target.scrollTop;\n var scrollLength = _this2.props.horizontal ? ev.target.scrollWidth : ev.target.scrollHeight;\n var clientLength = _this2.props.horizontal ? ev.target.clientWidth : ev.target.clientHeight;\n var isEventTargetScrollable = scrollLength > clientLength;\n var delta = _this2.props.horizontal ? ev.deltaX || ev.wheelDeltaX : ev.deltaY || ev.wheelDeltaY;\n var leftoverDelta = delta;\n if (isEventTargetScrollable) {\n leftoverDelta = delta < 0 ? Math.min(delta + scrollOffset, 0) : Math.max(delta - (scrollLength - clientLength - scrollOffset), 0);\n }\n var targetDelta = delta - leftoverDelta;\n if (_this2.props.inverted && _this2._scrollRef && _this2._scrollRef.getScrollableNode) {\n var node = _this2._scrollRef.getScrollableNode();\n if (_this2.props.horizontal) {\n ev.target.scrollLeft += targetDelta;\n var nextScrollLeft = node.scrollLeft - leftoverDelta;\n node.scrollLeft = !_this2.props.getItemLayout ? Math.min(nextScrollLeft, _this2._totalCellLength) : nextScrollLeft;\n } else {\n ev.target.scrollTop += targetDelta;\n var nextScrollTop = node.scrollTop - leftoverDelta;\n node.scrollTop = !_this2.props.getItemLayout ? Math.min(nextScrollTop, _this2._totalCellLength) : nextScrollTop;\n }\n ev.preventDefault();\n }\n };\n return _this2;\n }\n _inherits(VirtualizedList, _StateSafePureCompone);\n return _createClass(VirtualizedList, [{\n key: \"scrollToEnd\",\n value: function scrollToEnd(params) {\n var animated = params ? params.animated : true;\n var veryLast = this.props.getItemCount(this.props.data) - 1;\n if (veryLast < 0) {\n return;\n }\n var frame = this.__getFrameMetricsApprox(veryLast, this.props);\n var offset = Math.max(0, frame.offset + frame.length + this._footerLength - this._scrollMetrics.visibleLength);\n if (this._scrollRef == null) {\n return;\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 this._scrollRef.scrollTo(horizontalOrDefault(this.props.horizontal) ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n }\n }, {\n key: \"scrollToIndex\",\n value: 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 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 var frame = this.__getFrameMetricsApprox(Math.floor(index), this.props);\n var offset = Math.max(0, this._getOffsetApprox(index, this.props) - (viewPosition || 0) * (this._scrollMetrics.visibleLength - frame.length)) - (viewOffset || 0);\n if (this._scrollRef == null) {\n return;\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 this._scrollRef.scrollTo(horizontal ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n }\n }, {\n key: \"scrollToItem\",\n value: 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 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 key: \"scrollToOffset\",\n value: function scrollToOffset(params) {\n var animated = params.animated,\n offset = params.offset;\n if (this._scrollRef == null) {\n return;\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 this._scrollRef.scrollTo(horizontalOrDefault(this.props.horizontal) ? {\n x: offset,\n animated: animated\n } : {\n y: offset,\n animated: animated\n });\n }\n }, {\n key: \"recordInteraction\",\n value: function recordInteraction() {\n this._nestedChildLists.forEach(function (childList) {\n childList.recordInteraction();\n });\n this._viewabilityTuples.forEach(function (t) {\n t.viewabilityHelper.recordInteraction();\n });\n this._updateViewableItems(this.props, this.state.cellsAroundViewport);\n }\n }, {\n key: \"flashScrollIndicators\",\n value: function flashScrollIndicators() {\n if (this._scrollRef == null) {\n return;\n }\n this._scrollRef.flashScrollIndicators();\n }\n }, {\n key: \"getScrollResponder\",\n value: function getScrollResponder() {\n if (this._scrollRef && this._scrollRef.getScrollResponder) {\n return this._scrollRef.getScrollResponder();\n }\n }\n }, {\n key: \"getScrollableNode\",\n value: function getScrollableNode() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n return this._scrollRef.getScrollableNode();\n } else {\n return this._scrollRef;\n }\n }\n }, {\n key: \"getScrollRef\",\n value: function getScrollRef() {\n if (this._scrollRef && this._scrollRef.getScrollRef) {\n return this._scrollRef.getScrollRef();\n } else {\n return this._scrollRef;\n }\n }\n }, {\n key: \"_getCellKey\",\n value: function _getCellKey() {\n var _this$context;\n return ((_this$context = this.context) == null ? void 0 : _this$context.cellKey) || 'rootList';\n }\n }, {\n key: \"hasMore\",\n value: function hasMore() {\n return this._hasMore;\n }\n }, {\n key: \"_checkProps\",\n value: function _checkProps(props) {\n var onScroll = props.onScroll,\n windowSize = props.windowSize,\n getItemCount = props.getItemCount,\n data = props.data,\n initialScrollIndex = props.initialScrollIndex;\n invariant(!onScroll || !onScroll.__isNative, 'Components based on VirtualizedList must be wrapped with Animated.createAnimatedComponent ' + 'to support native onScroll events with useNativeDriver');\n invariant(windowSizeOrDefault(windowSize) > 0, 'VirtualizedList: The windowSize prop must be present and set to a value greater than 0.');\n invariant(getItemCount, 'VirtualizedList: The \"getItemCount\" prop must be provided');\n var itemCount = getItemCount(data);\n if (initialScrollIndex != null && !this._hasTriggeredInitialScrollToIndex && (initialScrollIndex < 0 || itemCount > 0 && initialScrollIndex >= itemCount) && !this._hasWarned.initialScrollIndex) {\n console.warn(\"initialScrollIndex \\\"\" + initialScrollIndex + \"\\\" is not valid (list has \" + itemCount + \" items)\");\n this._hasWarned.initialScrollIndex = true;\n }\n if (__DEV__ && !this._hasWarned.flexWrap) {\n var flatStyles = StyleSheet.flatten(this.props.contentContainerStyle);\n if (flatStyles != null && flatStyles.flexWrap === 'wrap') {\n console.warn('`flexWrap: `wrap`` is not supported with the `VirtualizedList` components.' + 'Consider using `numColumns` with `FlatList` instead.');\n this._hasWarned.flexWrap = true;\n }\n }\n }\n }, {\n key: \"_adjustCellsAroundViewport\",\n value: function _adjustCellsAroundViewport(props, cellsAroundViewport) {\n var data = props.data,\n getItemCount = props.getItemCount;\n var onEndReachedThreshold = onEndReachedThresholdOrDefault(props.onEndReachedThreshold);\n var _this$_scrollMetrics = this._scrollMetrics,\n contentLength = _this$_scrollMetrics.contentLength,\n offset = _this$_scrollMetrics.offset,\n visibleLength = _this$_scrollMetrics.visibleLength;\n var distanceFromEnd = contentLength - visibleLength - offset;\n if (visibleLength <= 0 || contentLength <= 0) {\n return cellsAroundViewport.last >= getItemCount(data) ? VirtualizedList._constrainToItemCount(cellsAroundViewport, props) : cellsAroundViewport;\n }\n var newCellsAroundViewport;\n if (props.disableVirtualization) {\n var renderAhead = distanceFromEnd < onEndReachedThreshold * visibleLength ? maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch) : 0;\n newCellsAroundViewport = {\n first: 0,\n last: Math.min(cellsAroundViewport.last + renderAhead, getItemCount(data) - 1)\n };\n } else {\n if (props.initialScrollIndex && !this._scrollMetrics.offset && Math.abs(distanceFromEnd) >= Number.EPSILON) {\n return cellsAroundViewport.last >= getItemCount(data) ? VirtualizedList._constrainToItemCount(cellsAroundViewport, props) : cellsAroundViewport;\n }\n newCellsAroundViewport = computeWindowedRenderLimits(props, maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch), windowSizeOrDefault(props.windowSize), cellsAroundViewport, this.__getFrameMetricsApprox, this._scrollMetrics);\n invariant(newCellsAroundViewport.last < getItemCount(data), 'computeWindowedRenderLimits() should return range in-bounds');\n }\n if (this._nestedChildLists.size() > 0) {\n var childIdx = this._findFirstChildWithMore(newCellsAroundViewport.first, newCellsAroundViewport.last);\n newCellsAroundViewport.last = childIdx !== null && childIdx !== void 0 ? childIdx : newCellsAroundViewport.last;\n }\n return newCellsAroundViewport;\n }\n }, {\n key: \"_findFirstChildWithMore\",\n value: function _findFirstChildWithMore(first, last) {\n for (var ii = first; ii <= last; ii++) {\n var cellKeyForIndex = this._indicesToKeys.get(ii);\n if (cellKeyForIndex != null && this._nestedChildLists.anyInCell(cellKeyForIndex, function (childList) {\n return childList.hasMore();\n })) {\n return ii;\n }\n }\n return null;\n }\n }, {\n key: \"componentDidMount\",\n value: function componentDidMount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.registerAsNestedChild({\n ref: this,\n cellKey: this.context.cellKey\n });\n }\n this.setupWebWheelHandler();\n }\n }, {\n key: \"componentWillUnmount\",\n value: function componentWillUnmount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.unregisterAsNestedChild({\n ref: this\n });\n }\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.dispose();\n });\n this._fillRateHelper.deactivateAndFlush();\n this.teardownWebWheelHandler();\n }\n }, {\n key: \"setupWebWheelHandler\",\n value: function setupWebWheelHandler() {\n var _this3 = this;\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n this._scrollRef.getScrollableNode().addEventListener('wheel', this.invertedWheelEventHandler);\n } else {\n setTimeout(function () {\n return _this3.setupWebWheelHandler();\n }, 50);\n return;\n }\n }\n }, {\n key: \"teardownWebWheelHandler\",\n value: function teardownWebWheelHandler() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n this._scrollRef.getScrollableNode().removeEventListener('wheel', this.invertedWheelEventHandler);\n }\n }\n }, {\n key: \"_pushCells\",\n value: function _pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, first, last, inversionStyle) {\n var _this = this;\n var _this$props4 = this.props,\n CellRendererComponent = _this$props4.CellRendererComponent,\n ItemSeparatorComponent = _this$props4.ItemSeparatorComponent,\n ListHeaderComponent = _this$props4.ListHeaderComponent,\n ListItemComponent = _this$props4.ListItemComponent,\n data = _this$props4.data,\n debug = _this$props4.debug,\n getItem = _this$props4.getItem,\n getItemCount = _this$props4.getItemCount,\n getItemLayout = _this$props4.getItemLayout,\n horizontal = _this$props4.horizontal,\n renderItem = _this$props4.renderItem;\n var stickyOffset = ListHeaderComponent ? 1 : 0;\n var end = getItemCount(data) - 1;\n var prevCellKey;\n last = Math.min(end, last);\n var _loop = function _loop() {\n var item = getItem(data, ii);\n var key = _this._keyExtractor(item, ii, _this.props);\n _this._indicesToKeys.set(ii, key);\n if (stickyIndicesFromProps.has(ii + stickyOffset)) {\n stickyHeaderIndices.push(cells.length);\n }\n var shouldListenForLayout = getItemLayout == null || debug || _this._fillRateHelper.enabled();\n cells.push(React.createElement(CellRenderer, _extends({\n CellRendererComponent: CellRendererComponent,\n ItemSeparatorComponent: ii < end ? ItemSeparatorComponent : undefined,\n ListItemComponent: ListItemComponent,\n cellKey: key,\n horizontal: horizontal,\n index: ii,\n inversionStyle: inversionStyle,\n item: item,\n key: key,\n prevCellKey: prevCellKey,\n onUpdateSeparators: _this._onUpdateSeparators,\n onCellFocusCapture: function onCellFocusCapture(e) {\n return _this._onCellFocusCapture(key);\n },\n onUnmount: _this._onCellUnmount,\n ref: function ref(_ref) {\n _this._cellRefs[key] = _ref;\n },\n renderItem: renderItem\n }, shouldListenForLayout && {\n onCellLayout: _this._onCellLayout\n })));\n prevCellKey = key;\n };\n for (var ii = first; ii <= last; ii++) {\n _loop();\n }\n }\n }, {\n key: \"_isNestedWithSameOrientation\",\n value: function _isNestedWithSameOrientation() {\n var nestedContext = this.context;\n return !!(nestedContext && !!nestedContext.horizontal === horizontalOrDefault(this.props.horizontal));\n }\n }, {\n key: \"_keyExtractor\",\n value: function _keyExtractor(item, index, props) {\n if (props.keyExtractor != null) {\n return props.keyExtractor(item, index);\n }\n var key = defaultKeyExtractor(item, index);\n if (key === String(index)) {\n _usedIndexForKey = true;\n if (item.type && item.type.displayName) {\n _keylessItemComponentName = item.type.displayName;\n }\n }\n return key;\n }\n }, {\n key: \"render\",\n value: function render() {\n var _this4 = this;\n this._checkProps(this.props);\n var _this$props5 = this.props,\n ListEmptyComponent = _this$props5.ListEmptyComponent,\n ListFooterComponent = _this$props5.ListFooterComponent,\n ListHeaderComponent = _this$props5.ListHeaderComponent;\n var _this$props6 = this.props,\n data = _this$props6.data,\n horizontal = _this$props6.horizontal;\n var inversionStyle = this.props.inverted ? horizontalOrDefault(this.props.horizontal) ? styles.horizontallyInverted : styles.verticallyInverted : null;\n var cells = [];\n var stickyIndicesFromProps = new Set(this.props.stickyHeaderIndices);\n var stickyHeaderIndices = [];\n if (ListHeaderComponent) {\n if (stickyIndicesFromProps.has(0)) {\n stickyHeaderIndices.push(0);\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: \"$header\"\n }, React.createElement(View, {\n onLayout: this._onLayoutHeader,\n style: [inversionStyle, this.props.ListHeaderComponentStyle]\n }, _element)));\n }\n var itemCount = this.props.getItemCount(data);\n if (itemCount === 0 && ListEmptyComponent) {\n var _element2 = React.isValidElement(ListEmptyComponent) ? ListEmptyComponent : React.createElement(ListEmptyComponent, null);\n cells.push(React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getCellKey() + '-empty',\n key: \"$empty\"\n }, React.cloneElement(_element2, {\n onLayout: function onLayout(event) {\n _this4._onLayoutEmpty(event);\n if (_element2.props.onLayout) {\n _element2.props.onLayout(event);\n }\n },\n style: [inversionStyle, _element2.props.style]\n })));\n }\n if (itemCount > 0) {\n _usedIndexForKey = false;\n _keylessItemComponentName = '';\n var spacerKey = this._getSpacerKey(!horizontal);\n var renderRegions = this.state.renderMask.enumerateRegions();\n var lastSpacer = findLastWhere(renderRegions, function (r) {\n return r.isSpacer;\n });\n for (var _iterator = _createForOfIteratorHelperLoose(renderRegions), _step; !(_step = _iterator()).done;) {\n var section = _step.value;\n if (section.isSpacer) {\n if (this.props.disableVirtualization) {\n continue;\n }\n var isLastSpacer = section === lastSpacer;\n var constrainToMeasured = isLastSpacer && !this.props.getItemLayout;\n var last = constrainToMeasured ? clamp(section.first - 1, section.last, this._highestMeasuredFrameIndex) : section.last;\n var firstMetrics = this.__getFrameMetricsApprox(section.first, this.props);\n var lastMetrics = this.__getFrameMetricsApprox(last, this.props);\n var spacerSize = lastMetrics.offset + lastMetrics.length - firstMetrics.offset;\n cells.push(React.createElement(View, {\n key: \"$spacer-\" + section.first,\n style: _defineProperty({}, spacerKey, spacerSize)\n }));\n } else {\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, section.first, section.last, inversionStyle);\n }\n }\n if (!this._hasWarned.keys && _usedIndexForKey) {\n console.warn('VirtualizedList: missing keys for items, make sure to specify a key or id property on each ' + 'item or provide a custom keyExtractor.', _keylessItemComponentName);\n this._hasWarned.keys = true;\n }\n }\n if (ListFooterComponent) {\n var _element3 = React.isValidElement(ListFooterComponent) ? ListFooterComponent : React.createElement(ListFooterComponent, null);\n cells.push(React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getFooterCellKey(),\n key: \"$footer\"\n }, React.createElement(View, {\n onLayout: this._onLayoutFooter,\n style: [inversionStyle, this.props.ListFooterComponentStyle]\n }, _element3)));\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: scrollEventThrottleOrDefault(this.props.scrollEventThrottle),\n invertStickyHeaders: this.props.invertStickyHeaders !== undefined ? this.props.invertStickyHeaders : this.props.inverted,\n stickyHeaderIndices: stickyHeaderIndices,\n style: inversionStyle ? [inversionStyle, this.props.style] : this.props.style\n });\n this._hasMore = this.state.cellsAroundViewport.last < itemCount - 1;\n var innerRet = React.createElement(VirtualizedListContextProvider, {\n value: {\n cellKey: null,\n getScrollMetrics: this._getScrollMetrics,\n horizontal: horizontalOrDefault(this.props.horizontal),\n getOutermostParentListRef: this._getOutermostParentListRef,\n registerAsNestedChild: this._registerAsNestedChild,\n unregisterAsNestedChild: this._unregisterAsNestedChild\n }\n }, React.cloneElement((this.props.renderScrollComponent || this._defaultRenderScrollComponent)(scrollProps), {\n ref: this._captureScrollRef\n }, cells));\n var ret = innerRet;\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 key: \"componentDidUpdate\",\n value: function componentDidUpdate(prevProps) {\n var _this$props7 = this.props,\n data = _this$props7.data,\n extraData = _this$props7.extraData;\n if (data !== prevProps.data || extraData !== prevProps.extraData) {\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.resetViewableIndices();\n });\n }\n var hiPriInProgress = this._hiPriInProgress;\n this._scheduleCellsToRenderUpdate();\n if (hiPriInProgress) {\n this._hiPriInProgress = false;\n }\n }\n }, {\n key: \"_computeBlankness\",\n value: function _computeBlankness() {\n this._fillRateHelper.computeBlankness(this.props, this.state.cellsAroundViewport, this._scrollMetrics);\n }\n }, {\n key: \"_onCellFocusCapture\",\n value: function _onCellFocusCapture(cellKey) {\n this._lastFocusedCellKey = cellKey;\n this._updateCellsToRender();\n }\n }, {\n key: \"_triggerRemeasureForChildListsInCell\",\n value: function _triggerRemeasureForChildListsInCell(cellKey) {\n this._nestedChildLists.forEachInCell(cellKey, function (childList) {\n childList.measureLayoutRelativeToContainingList();\n });\n }\n }, {\n key: \"measureLayoutRelativeToContainingList\",\n value: function measureLayoutRelativeToContainingList() {\n var _this5 = this;\n try {\n if (!this._scrollRef) {\n return;\n }\n this._scrollRef.measureLayout(this.context.getOutermostParentListRef().getScrollRef(), function (x, y, width, height) {\n _this5._offsetFromParentVirtualizedList = _this5._selectOffset({\n x: x,\n y: y\n });\n _this5._scrollMetrics.contentLength = _this5._selectLength({\n width: width,\n height: height\n });\n var scrollMetrics = _this5._convertParentScrollMetrics(_this5.context.getScrollMetrics());\n var metricsChanged = _this5._scrollMetrics.visibleLength !== scrollMetrics.visibleLength || _this5._scrollMetrics.offset !== scrollMetrics.offset;\n if (metricsChanged) {\n _this5._scrollMetrics.visibleLength = scrollMetrics.visibleLength;\n _this5._scrollMetrics.offset = scrollMetrics.offset;\n _this5._nestedChildLists.forEach(function (childList) {\n childList.measureLayoutRelativeToContainingList();\n });\n }\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 key: \"_getFooterCellKey\",\n value: function _getFooterCellKey() {\n return this._getCellKey() + '-footer';\n }\n }, {\n key: \"_renderDebugOverlay\",\n value: 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 for (var ii = 0; ii < itemCount; ii++) {\n var frame = this.__getFrameMetricsApprox(ii, this.props);\n if (frame.inLayout) {\n framesInLayout.push(frame);\n }\n }\n var windowTop = this.__getFrameMetricsApprox(this.state.cellsAroundViewport.first, this.props).offset;\n var frameLast = this.__getFrameMetricsApprox(this.state.cellsAroundViewport.last, this.props);\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 key: \"_selectLength\",\n value: function _selectLength(metrics) {\n return !horizontalOrDefault(this.props.horizontal) ? metrics.height : metrics.width;\n }\n }, {\n key: \"_selectOffset\",\n value: function _selectOffset(metrics) {\n return !horizontalOrDefault(this.props.horizontal) ? metrics.y : metrics.x;\n }\n }, {\n key: \"_maybeCallOnEdgeReached\",\n value: function _maybeCallOnEdgeReached() {\n var _this$props8 = this.props,\n data = _this$props8.data,\n getItemCount = _this$props8.getItemCount,\n onStartReached = _this$props8.onStartReached,\n onStartReachedThreshold = _this$props8.onStartReachedThreshold,\n onEndReached = _this$props8.onEndReached,\n onEndReachedThreshold = _this$props8.onEndReachedThreshold,\n initialScrollIndex = _this$props8.initialScrollIndex;\n var _this$_scrollMetrics2 = this._scrollMetrics,\n contentLength = _this$_scrollMetrics2.contentLength,\n visibleLength = _this$_scrollMetrics2.visibleLength,\n offset = _this$_scrollMetrics2.offset;\n var distanceFromStart = offset;\n var distanceFromEnd = contentLength - visibleLength - offset;\n if (distanceFromStart < ON_EDGE_REACHED_EPSILON) {\n distanceFromStart = 0;\n }\n if (distanceFromEnd < ON_EDGE_REACHED_EPSILON) {\n distanceFromEnd = 0;\n }\n var DEFAULT_THRESHOLD_PX = 2;\n var startThreshold = onStartReachedThreshold != null ? onStartReachedThreshold * visibleLength : DEFAULT_THRESHOLD_PX;\n var endThreshold = onEndReachedThreshold != null ? onEndReachedThreshold * visibleLength : DEFAULT_THRESHOLD_PX;\n var isWithinStartThreshold = distanceFromStart <= startThreshold;\n var isWithinEndThreshold = distanceFromEnd <= endThreshold;\n if (onEndReached && this.state.cellsAroundViewport.last === getItemCount(data) - 1 && isWithinEndThreshold && this._scrollMetrics.contentLength !== this._sentEndForContentLength) {\n this._sentEndForContentLength = this._scrollMetrics.contentLength;\n onEndReached({\n distanceFromEnd: distanceFromEnd\n });\n } else if (onStartReached != null && this.state.cellsAroundViewport.first === 0 && isWithinStartThreshold && this._scrollMetrics.contentLength !== this._sentStartForContentLength) {\n if (!initialScrollIndex || this._scrollMetrics.timestamp !== 0) {\n this._sentStartForContentLength = this._scrollMetrics.contentLength;\n onStartReached({\n distanceFromStart: distanceFromStart\n });\n }\n } else {\n this._sentStartForContentLength = isWithinStartThreshold ? this._sentStartForContentLength : 0;\n this._sentEndForContentLength = isWithinEndThreshold ? this._sentEndForContentLength : 0;\n }\n }\n }, {\n key: \"_scheduleCellsToRenderUpdate\",\n value: function _scheduleCellsToRenderUpdate() {\n var _this$state$cellsArou = this.state.cellsAroundViewport,\n first = _this$state$cellsArou.first,\n last = _this$state$cellsArou.last;\n var _this$_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 onStartReachedThreshold = onStartReachedThresholdOrDefault(this.props.onStartReachedThreshold);\n var onEndReachedThreshold = onEndReachedThresholdOrDefault(this.props.onEndReachedThreshold);\n if (first > 0) {\n var distTop = offset - this.__getFrameMetricsApprox(first, this.props).offset;\n hiPri = distTop < 0 || velocity < -2 && distTop < getScrollingThreshold(onStartReachedThreshold, visibleLength);\n }\n if (!hiPri && last >= 0 && last < itemCount - 1) {\n var distBottom = this.__getFrameMetricsApprox(last, this.props).offset - (offset + visibleLength);\n hiPri = distBottom < 0 || velocity > 2 && distBottom < getScrollingThreshold(onEndReachedThreshold, visibleLength);\n }\n if (hiPri && (this._averageCellLength || this.props.getItemLayout) && !this._hiPriInProgress) {\n this._hiPriInProgress = true;\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n this._updateCellsToRender();\n return;\n } else {\n this._updateCellsToRenderBatcher.schedule();\n }\n }\n }, {\n key: \"_updateViewableItems\",\n value: function _updateViewableItems(props, cellsAroundViewport) {\n var _this6 = this;\n this._viewabilityTuples.forEach(function (tuple) {\n tuple.viewabilityHelper.onUpdate(props, _this6._scrollMetrics.offset, _this6._scrollMetrics.visibleLength, _this6._getFrameMetrics, _this6._createViewToken, tuple.onViewableItemsChanged, cellsAroundViewport);\n });\n }\n }], [{\n key: \"_createRenderMask\",\n value: function _createRenderMask(props, cellsAroundViewport, additionalRegions) {\n var itemCount = props.getItemCount(props.data);\n invariant(cellsAroundViewport.first >= 0 && cellsAroundViewport.last >= cellsAroundViewport.first - 1 && cellsAroundViewport.last < itemCount, \"Invalid cells around viewport \\\"[\" + cellsAroundViewport.first + \", \" + cellsAroundViewport.last + \"]\\\" was passed to VirtualizedList._createRenderMask\");\n var renderMask = new CellRenderMask(itemCount);\n if (itemCount > 0) {\n var allRegions = [cellsAroundViewport].concat(_toConsumableArray(additionalRegions !== null && additionalRegions !== void 0 ? additionalRegions : []));\n for (var _i2 = 0, _allRegions = allRegions; _i2 < _allRegions.length; _i2++) {\n var region = _allRegions[_i2];\n renderMask.addCells(region);\n }\n if (props.initialScrollIndex == null || props.initialScrollIndex <= 0) {\n var initialRegion = VirtualizedList._initialRenderRegion(props);\n renderMask.addCells(initialRegion);\n }\n var stickyIndicesSet = new Set(props.stickyHeaderIndices);\n VirtualizedList._ensureClosestStickyHeader(props, stickyIndicesSet, renderMask, cellsAroundViewport.first);\n }\n return renderMask;\n }\n }, {\n key: \"_initialRenderRegion\",\n value: function _initialRenderRegion(props) {\n var _props$initialScrollI;\n var itemCount = props.getItemCount(props.data);\n var firstCellIndex = Math.max(0, Math.min(itemCount - 1, Math.floor((_props$initialScrollI = props.initialScrollIndex) !== null && _props$initialScrollI !== void 0 ? _props$initialScrollI : 0)));\n var lastCellIndex = Math.min(itemCount, firstCellIndex + initialNumToRenderOrDefault(props.initialNumToRender)) - 1;\n return {\n first: firstCellIndex,\n last: lastCellIndex\n };\n }\n }, {\n key: \"_ensureClosestStickyHeader\",\n value: function _ensureClosestStickyHeader(props, stickyIndicesSet, renderMask, cellIdx) {\n var stickyOffset = props.ListHeaderComponent ? 1 : 0;\n for (var itemIdx = cellIdx - 1; itemIdx >= 0; itemIdx--) {\n if (stickyIndicesSet.has(itemIdx + stickyOffset)) {\n renderMask.addCells({\n first: itemIdx,\n last: itemIdx\n });\n break;\n }\n }\n }\n }, {\n key: \"getDerivedStateFromProps\",\n value: function getDerivedStateFromProps(newProps, prevState) {\n var itemCount = newProps.getItemCount(newProps.data);\n if (itemCount === prevState.renderMask.numCells()) {\n return prevState;\n }\n var constrainedCells = VirtualizedList._constrainToItemCount(prevState.cellsAroundViewport, newProps);\n return {\n cellsAroundViewport: constrainedCells,\n renderMask: VirtualizedList._createRenderMask(newProps, constrainedCells)\n };\n }\n }, {\n key: \"_constrainToItemCount\",\n value: function _constrainToItemCount(cells, props) {\n var itemCount = props.getItemCount(props.data);\n var last = Math.min(itemCount - 1, cells.last);\n var maxToRenderPerBatch = maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch);\n return {\n first: clamp(0, itemCount - 1 - maxToRenderPerBatch, cells.first),\n last: last\n };\n }\n }]);\n}(StateSafePureComponent);\nVirtualizedList.contextType = VirtualizedListContext;\nvar styles = StyleSheet.create({\n verticallyInverted: {\n transform: 'scaleY(-1)'\n },\n horizontallyInverted: {\n transform: 'scaleX(-1)'\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 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_createForOfIteratorHelperLoose from \"@babel/runtime/helpers/createForOfIteratorHelperLoose\";\nimport _extends from \"@babel/runtime/helpers/extends\";\nimport _objectSpread from \"@babel/runtime/helpers/objectSpread2\";\n/**\n * Copyright (c) Meta Platforms, Inc. and 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 */\n\nimport RefreshControl from '../../../exports/RefreshControl';\nimport ScrollView from '../../../exports/ScrollView';\nimport View from '../../../exports/View';\nimport StyleSheet from '../../../exports/StyleSheet';\nimport findNodeHandle from '../../../exports/findNodeHandle';\nimport Batchinator from '../Batchinator';\nimport clamp from '../Utilities/clamp';\nimport infoLog from '../infoLog';\nimport { CellRenderMask } from './CellRenderMask';\nimport ChildListCollection from './ChildListCollection';\nimport FillRateHelper from '../FillRateHelper';\nimport StateSafePureComponent from './StateSafePureComponent';\nimport ViewabilityHelper from '../ViewabilityHelper';\nimport CellRenderer from './VirtualizedListCellRenderer';\nimport { VirtualizedListCellContextProvider, VirtualizedListContext, VirtualizedListContextProvider } from './VirtualizedListContext.js';\nimport { computeWindowedRenderLimits, keyExtractor as defaultKeyExtractor } from '../VirtualizeUtils';\nimport invariant from 'fbjs/lib/invariant';\nimport nullthrows from 'nullthrows';\nimport * as React from 'react';\nvar __DEV__ = process.env.NODE_ENV !== 'production';\nvar ON_EDGE_REACHED_EPSILON = 0.001;\nvar _usedIndexForKey = false;\nvar _keylessItemComponentName = '';\n/**\n * Default Props Helper Functions\n * Use the following helper functions for default values\n */\n\n// horizontalOrDefault(this.props.horizontal)\nfunction horizontalOrDefault(horizontal) {\n return horizontal !== null && horizontal !== void 0 ? horizontal : false;\n}\n\n// initialNumToRenderOrDefault(this.props.initialNumToRender)\nfunction initialNumToRenderOrDefault(initialNumToRender) {\n return initialNumToRender !== null && initialNumToRender !== void 0 ? initialNumToRender : 10;\n}\n\n// maxToRenderPerBatchOrDefault(this.props.maxToRenderPerBatch)\nfunction maxToRenderPerBatchOrDefault(maxToRenderPerBatch) {\n return maxToRenderPerBatch !== null && maxToRenderPerBatch !== void 0 ? maxToRenderPerBatch : 10;\n}\n\n// onStartReachedThresholdOrDefault(this.props.onStartReachedThreshold)\nfunction onStartReachedThresholdOrDefault(onStartReachedThreshold) {\n return onStartReachedThreshold !== null && onStartReachedThreshold !== void 0 ? onStartReachedThreshold : 2;\n}\n\n// onEndReachedThresholdOrDefault(this.props.onEndReachedThreshold)\nfunction onEndReachedThresholdOrDefault(onEndReachedThreshold) {\n return onEndReachedThreshold !== null && onEndReachedThreshold !== void 0 ? onEndReachedThreshold : 2;\n}\n\n// getScrollingThreshold(visibleLength, onEndReachedThreshold)\nfunction getScrollingThreshold(threshold, visibleLength) {\n return threshold * visibleLength / 2;\n}\n\n// scrollEventThrottleOrDefault(this.props.scrollEventThrottle)\nfunction scrollEventThrottleOrDefault(scrollEventThrottle) {\n return scrollEventThrottle !== null && scrollEventThrottle !== void 0 ? scrollEventThrottle : 50;\n}\n\n// windowSizeOrDefault(this.props.windowSize)\nfunction windowSizeOrDefault(windowSize) {\n return windowSize !== null && windowSize !== void 0 ? windowSize : 21;\n}\nfunction findLastWhere(arr, predicate) {\n for (var i = arr.length - 1; i >= 0; i--) {\n if (predicate(arr[i])) {\n return arr[i];\n }\n }\n return null;\n}\n\n/**\n * Base implementation for the more convenient [``](https://reactnative.dev/docs/flatlist)\n * and [``](https://reactnative.dev/docs/sectionlist) 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 * - As an effort to remove defaultProps, use helper functions when referencing certain props\n *\n */\nclass VirtualizedList extends StateSafePureComponent {\n // scrollToEnd may be janky without getItemLayout prop\n scrollToEnd(params) {\n var animated = params ? params.animated : true;\n var veryLast = this.props.getItemCount(this.props.data) - 1;\n if (veryLast < 0) {\n return;\n }\n var frame = this.__getFrameMetricsApprox(veryLast, this.props);\n var offset = Math.max(0, frame.offset + frame.length + this._footerLength - this._scrollMetrics.visibleLength);\n if (this._scrollRef == null) {\n return;\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 this._scrollRef.scrollTo(horizontalOrDefault(this.props.horizontal) ? {\n x: offset,\n animated\n } : {\n y: offset,\n animated\n });\n }\n\n // scrollToIndex may be janky without getItemLayout prop\n 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$props.onScrollToIndexFailed;\n var animated = params.animated,\n index = params.index,\n viewOffset = params.viewOffset,\n viewPosition = params.viewPosition;\n invariant(index >= 0, \"scrollToIndex out of range: requested index \" + index + \" but minimum is 0\");\n invariant(getItemCount(data) >= 1, \"scrollToIndex out of range: item length \" + getItemCount(data) + \" but minimum is 1\");\n invariant(index < getItemCount(data), \"scrollToIndex out of range: requested index \" + index + \" is out of 0 to \" + (getItemCount(data) - 1));\n if (!getItemLayout && index > this._highestMeasuredFrameIndex) {\n invariant(!!onScrollToIndexFailed, 'scrollToIndex should be used in conjunction with getItemLayout or onScrollToIndexFailed, ' + 'otherwise there is no way to know the location of offscreen indices or handle failures.');\n onScrollToIndexFailed({\n averageItemLength: this._averageCellLength,\n highestMeasuredFrameIndex: this._highestMeasuredFrameIndex,\n index\n });\n return;\n }\n var frame = this.__getFrameMetricsApprox(Math.floor(index), this.props);\n var offset = Math.max(0, this._getOffsetApprox(index, this.props) - (viewPosition || 0) * (this._scrollMetrics.visibleLength - frame.length)) - (viewOffset || 0);\n if (this._scrollRef == null) {\n return;\n }\n if (this._scrollRef.scrollTo == null) {\n console.warn('No scrollTo method provided. This may be because you have two nested ' + 'VirtualizedLists with the same orientation, or because you are ' + 'using a custom component that does not implement scrollTo.');\n return;\n }\n this._scrollRef.scrollTo(horizontal ? {\n x: offset,\n animated\n } : {\n y: offset,\n animated\n });\n }\n\n // scrollToItem may be janky without getItemLayout prop. Required linear scan through items -\n // use scrollToIndex instead if possible.\n scrollToItem(params) {\n var item = params.item;\n var _this$props2 = this.props,\n data = _this$props2.data,\n getItem = _this$props2.getItem,\n getItemCount = _this$props2.getItemCount;\n var itemCount = getItemCount(data);\n 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 /**\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 scrollToOffset(params) {\n var animated = params.animated,\n offset = params.offset;\n if (this._scrollRef == null) {\n return;\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 this._scrollRef.scrollTo(horizontalOrDefault(this.props.horizontal) ? {\n x: offset,\n animated\n } : {\n y: offset,\n animated\n });\n }\n recordInteraction() {\n this._nestedChildLists.forEach(childList => {\n childList.recordInteraction();\n });\n this._viewabilityTuples.forEach(t => {\n t.viewabilityHelper.recordInteraction();\n });\n this._updateViewableItems(this.props, this.state.cellsAroundViewport);\n }\n flashScrollIndicators() {\n if (this._scrollRef == null) {\n return;\n }\n this._scrollRef.flashScrollIndicators();\n }\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 getScrollResponder() {\n if (this._scrollRef && this._scrollRef.getScrollResponder) {\n return this._scrollRef.getScrollResponder();\n }\n }\n getScrollableNode() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n return this._scrollRef.getScrollableNode();\n } else {\n return this._scrollRef;\n }\n }\n getScrollRef() {\n if (this._scrollRef && this._scrollRef.getScrollRef) {\n return this._scrollRef.getScrollRef();\n } else {\n return this._scrollRef;\n }\n }\n _getCellKey() {\n var _this$context;\n return ((_this$context = this.context) == null ? void 0 : _this$context.cellKey) || 'rootList';\n }\n\n // $FlowFixMe[missing-local-annot]\n\n hasMore() {\n return this._hasMore;\n }\n\n // $FlowFixMe[missing-local-annot]\n\n // REACT-NATIVE-WEB patch to preserve during future RN merges: Support inverted wheel scroller.\n\n constructor(_props) {\n var _this$props$updateCel;\n super(_props);\n this._getScrollMetrics = () => {\n return this._scrollMetrics;\n };\n this._getOutermostParentListRef = () => {\n if (this._isNestedWithSameOrientation()) {\n return this.context.getOutermostParentListRef();\n } else {\n return this;\n }\n };\n this._registerAsNestedChild = childList => {\n this._nestedChildLists.add(childList.ref, childList.cellKey);\n if (this._hasInteracted) {\n childList.ref.recordInteraction();\n }\n };\n this._unregisterAsNestedChild = childList => {\n this._nestedChildLists.remove(childList.ref);\n };\n this._onUpdateSeparators = (keys, newProps) => {\n keys.forEach(key => {\n var ref = key != null && this._cellRefs[key];\n ref && ref.updateSeparatorProps(newProps);\n });\n };\n this._getSpacerKey = isVertical => isVertical ? 'height' : 'width';\n this._averageCellLength = 0;\n this._cellRefs = {};\n this._frames = {};\n this._footerLength = 0;\n this._hasTriggeredInitialScrollToIndex = 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._lastFocusedCellKey = null;\n this._nestedChildLists = new ChildListCollection();\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 zoomScale: 1\n };\n this._scrollRef = null;\n this._sentStartForContentLength = 0;\n this._sentEndForContentLength = 0;\n this._totalCellLength = 0;\n this._totalCellsMeasured = 0;\n this._viewabilityTuples = [];\n this._captureScrollRef = ref => {\n this._scrollRef = ref;\n };\n this._defaultRenderScrollComponent = props => {\n var onRefresh = props.onRefresh;\n if (this._isNestedWithSameOrientation()) {\n // $FlowFixMe[prop-missing] - Typing ReactNativeComponent revealed errors\n return /*#__PURE__*/React.createElement(View, props);\n } else if (onRefresh) {\n var _props$refreshing;\n invariant(typeof props.refreshing === 'boolean', '`refreshing` prop must be set as a boolean in order to use `onRefresh`, but got `' + JSON.stringify((_props$refreshing = props.refreshing) !== null && _props$refreshing !== void 0 ? _props$refreshing : 'undefined') + '`');\n return (\n /*#__PURE__*/\n // $FlowFixMe[prop-missing] Invalid prop usage\n // $FlowFixMe[incompatible-use]\n React.createElement(ScrollView, _extends({}, props, {\n refreshControl: props.refreshControl == null ? /*#__PURE__*/React.createElement(RefreshControl\n // $FlowFixMe[incompatible-type]\n , {\n refreshing: props.refreshing,\n onRefresh: onRefresh,\n progressViewOffset: props.progressViewOffset\n }) : props.refreshControl\n }))\n );\n } else {\n // $FlowFixMe[prop-missing] Invalid prop usage\n // $FlowFixMe[incompatible-use]\n return /*#__PURE__*/React.createElement(ScrollView, props);\n }\n };\n this._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,\n inLayout: true\n };\n var curr = this._frames[cellKey];\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 this._scheduleCellsToRenderUpdate();\n } else {\n this._frames[cellKey].inLayout = true;\n }\n this._triggerRemeasureForChildListsInCell(cellKey);\n this._computeBlankness();\n this._updateViewableItems(this.props, this.state.cellsAroundViewport);\n };\n this._onCellUnmount = cellKey => {\n delete this._cellRefs[cellKey];\n var curr = this._frames[cellKey];\n if (curr) {\n this._frames[cellKey] = _objectSpread(_objectSpread({}, curr), {}, {\n inLayout: false\n });\n }\n };\n this._onLayout = 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 this.props.onLayout && this.props.onLayout(e);\n this._scheduleCellsToRenderUpdate();\n this._maybeCallOnEdgeReached();\n };\n this._onLayoutEmpty = e => {\n this.props.onLayout && this.props.onLayout(e);\n };\n this._onLayoutFooter = e => {\n this._triggerRemeasureForChildListsInCell(this._getFooterCellKey());\n this._footerLength = this._selectLength(e.nativeEvent.layout);\n };\n this._onLayoutHeader = e => {\n this._headerLength = this._selectLength(e.nativeEvent.layout);\n };\n this._onContentSizeChange = (width, height) => {\n if (width > 0 && height > 0 && this.props.initialScrollIndex != null && this.props.initialScrollIndex > 0 && !this._hasTriggeredInitialScrollToIndex) {\n if (this.props.contentOffset == null) {\n if (this.props.initialScrollIndex < this.props.getItemCount(this.props.data)) {\n this.scrollToIndex({\n animated: false,\n index: nullthrows(this.props.initialScrollIndex)\n });\n } else {\n this.scrollToEnd({\n animated: false\n });\n }\n }\n this._hasTriggeredInitialScrollToIndex = true;\n }\n if (this.props.onContentSizeChange) {\n this.props.onContentSizeChange(width, height);\n }\n this._scrollMetrics.contentLength = this._selectLength({\n height,\n width\n });\n this._scheduleCellsToRenderUpdate();\n this._maybeCallOnEdgeReached();\n };\n this._convertParentScrollMetrics = 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;\n // Child's visible length is the same as its parent's\n var visibleLength = metrics.visibleLength;\n var dOffset = offset - this._scrollMetrics.offset;\n var contentLength = this._scrollMetrics.contentLength;\n return {\n visibleLength,\n contentLength,\n offset,\n dOffset\n };\n };\n this._onScroll = e => {\n this._nestedChildLists.forEach(childList => {\n childList._onScroll(e);\n });\n if (this.props.onScroll) {\n this.props.onScroll(e);\n }\n var timestamp = e.timeStamp;\n var visibleLength = this._selectLength(e.nativeEvent.layoutMeasurement);\n var contentLength = this._selectLength(e.nativeEvent.contentSize);\n var offset = this._selectOffset(e.nativeEvent.contentOffset);\n var dOffset = offset - this._scrollMetrics.offset;\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 var _this$_convertParentS = this._convertParentScrollMetrics({\n visibleLength,\n offset\n });\n visibleLength = _this$_convertParentS.visibleLength;\n contentLength = _this$_convertParentS.contentLength;\n offset = _this$_convertParentS.offset;\n dOffset = _this$_convertParentS.dOffset;\n }\n var dt = this._scrollMetrics.timestamp ? Math.max(1, timestamp - this._scrollMetrics.timestamp) : 1;\n var velocity = dOffset / dt;\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,\n prevDt: this._scrollMetrics.dt,\n contentLength\n });\n this._hasWarned.perf = true;\n }\n\n // For invalid negative values (w/ RTL), set this to 1.\n var zoomScale = e.nativeEvent.zoomScale < 0 ? 1 : e.nativeEvent.zoomScale;\n this._scrollMetrics = {\n contentLength,\n dt,\n dOffset,\n offset,\n timestamp,\n velocity,\n visibleLength,\n zoomScale\n };\n this._updateViewableItems(this.props, this.state.cellsAroundViewport);\n if (!this.props) {\n return;\n }\n this._maybeCallOnEdgeReached();\n if (velocity !== 0) {\n this._fillRateHelper.activate();\n }\n this._computeBlankness();\n this._scheduleCellsToRenderUpdate();\n };\n this._onScrollBeginDrag = e => {\n this._nestedChildLists.forEach(childList => {\n childList._onScrollBeginDrag(e);\n });\n this._viewabilityTuples.forEach(tuple => {\n tuple.viewabilityHelper.recordInteraction();\n });\n this._hasInteracted = true;\n this.props.onScrollBeginDrag && this.props.onScrollBeginDrag(e);\n };\n this._onScrollEndDrag = e => {\n this._nestedChildLists.forEach(childList => {\n childList._onScrollEndDrag(e);\n });\n var velocity = e.nativeEvent.velocity;\n if (velocity) {\n this._scrollMetrics.velocity = this._selectOffset(velocity);\n }\n this._computeBlankness();\n this.props.onScrollEndDrag && this.props.onScrollEndDrag(e);\n };\n this._onMomentumScrollBegin = e => {\n this._nestedChildLists.forEach(childList => {\n childList._onMomentumScrollBegin(e);\n });\n this.props.onMomentumScrollBegin && this.props.onMomentumScrollBegin(e);\n };\n this._onMomentumScrollEnd = e => {\n this._nestedChildLists.forEach(childList => {\n childList._onMomentumScrollEnd(e);\n });\n this._scrollMetrics.velocity = 0;\n this._computeBlankness();\n this.props.onMomentumScrollEnd && this.props.onMomentumScrollEnd(e);\n };\n this._updateCellsToRender = () => {\n this._updateViewableItems(this.props, this.state.cellsAroundViewport);\n this.setState((state, props) => {\n var cellsAroundViewport = this._adjustCellsAroundViewport(props, state.cellsAroundViewport);\n var renderMask = VirtualizedList._createRenderMask(props, cellsAroundViewport, this._getNonViewportRenderRegions(props));\n if (cellsAroundViewport.first === state.cellsAroundViewport.first && cellsAroundViewport.last === state.cellsAroundViewport.last && renderMask.equals(state.renderMask)) {\n return null;\n }\n return {\n cellsAroundViewport,\n renderMask\n };\n });\n };\n this._createViewToken = (index, isViewable, props\n // $FlowFixMe[missing-local-annot]\n ) => {\n var data = props.data,\n getItem = props.getItem;\n var item = getItem(data, index);\n return {\n index,\n item,\n key: this._keyExtractor(item, index, props),\n isViewable\n };\n };\n this._getOffsetApprox = (index, props) => {\n if (Number.isInteger(index)) {\n return this.__getFrameMetricsApprox(index, props).offset;\n } else {\n var frameMetrics = this.__getFrameMetricsApprox(Math.floor(index), props);\n var remainder = index - Math.floor(index);\n return frameMetrics.offset + remainder * frameMetrics.length;\n }\n };\n this.__getFrameMetricsApprox = (index, props) => {\n var frame = this._getFrameMetrics(index, props);\n if (frame && frame.index === index) {\n // check for invalid frames due to row re-ordering\n return frame;\n } else {\n var data = props.data,\n getItemCount = props.getItemCount,\n getItemLayout = props.getItemLayout;\n invariant(index >= 0 && index < getItemCount(data), 'Tried to get frame for out of range index ' + index);\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 this._getFrameMetrics = (index, props) => {\n var data = props.data,\n getItem = props.getItem,\n getItemCount = props.getItemCount,\n getItemLayout = props.getItemLayout;\n invariant(index >= 0 && index < getItemCount(data), 'Tried to get frame for out of range index ' + index);\n var item = getItem(data, index);\n var frame = this._frames[this._keyExtractor(item, index, props)];\n if (!frame || frame.index !== index) {\n if (getItemLayout) {\n /* $FlowFixMe[prop-missing] (>=0.63.0 site=react_native_fb) This comment\n * suppresses an error found when Flow v0.63 was deployed. To see the error\n * delete this comment and run Flow. */\n return getItemLayout(data, index);\n }\n }\n return frame;\n };\n this._getNonViewportRenderRegions = props => {\n // Keep a viewport's worth of content around the last focused cell to allow\n // random navigation around it without any blanking. E.g. tabbing from one\n // focused item out of viewport to another.\n if (!(this._lastFocusedCellKey && this._cellRefs[this._lastFocusedCellKey])) {\n return [];\n }\n var lastFocusedCellRenderer = this._cellRefs[this._lastFocusedCellKey];\n var focusedCellIndex = lastFocusedCellRenderer.props.index;\n var itemCount = props.getItemCount(props.data);\n\n // The last cell we rendered may be at a new index. Bail if we don't know\n // where it is.\n if (focusedCellIndex >= itemCount || this._keyExtractor(props.getItem(props.data, focusedCellIndex), focusedCellIndex, props) !== this._lastFocusedCellKey) {\n return [];\n }\n var first = focusedCellIndex;\n var heightOfCellsBeforeFocused = 0;\n for (var i = first - 1; i >= 0 && heightOfCellsBeforeFocused < this._scrollMetrics.visibleLength; i--) {\n first--;\n heightOfCellsBeforeFocused += this.__getFrameMetricsApprox(i, props).length;\n }\n var last = focusedCellIndex;\n var heightOfCellsAfterFocused = 0;\n for (var _i = last + 1; _i < itemCount && heightOfCellsAfterFocused < this._scrollMetrics.visibleLength; _i++) {\n last++;\n heightOfCellsAfterFocused += this.__getFrameMetricsApprox(_i, props).length;\n }\n return [{\n first,\n last\n }];\n };\n this._checkProps(_props);\n this._fillRateHelper = new FillRateHelper(this._getFrameMetrics);\n this._updateCellsToRenderBatcher = new Batchinator(this._updateCellsToRender, (_this$props$updateCel = this.props.updateCellsBatchingPeriod) !== null && _this$props$updateCel !== void 0 ? _this$props$updateCel : 50);\n if (this.props.viewabilityConfigCallbackPairs) {\n this._viewabilityTuples = this.props.viewabilityConfigCallbackPairs.map(pair => ({\n viewabilityHelper: new ViewabilityHelper(pair.viewabilityConfig),\n onViewableItemsChanged: pair.onViewableItemsChanged\n }));\n } else {\n var _this$props3 = this.props,\n onViewableItemsChanged = _this$props3.onViewableItemsChanged,\n viewabilityConfig = _this$props3.viewabilityConfig;\n if (onViewableItemsChanged) {\n this._viewabilityTuples.push({\n viewabilityHelper: new ViewabilityHelper(viewabilityConfig),\n onViewableItemsChanged: onViewableItemsChanged\n });\n }\n }\n var initialRenderRegion = VirtualizedList._initialRenderRegion(_props);\n this.state = {\n cellsAroundViewport: initialRenderRegion,\n renderMask: VirtualizedList._createRenderMask(_props, initialRenderRegion)\n };\n\n // REACT-NATIVE-WEB patch to preserve during future RN merges: Support inverted wheel scroller.\n // For issue https://github.com/necolas/react-native-web/issues/995\n this.invertedWheelEventHandler = ev => {\n var scrollOffset = this.props.horizontal ? ev.target.scrollLeft : ev.target.scrollTop;\n var scrollLength = this.props.horizontal ? ev.target.scrollWidth : ev.target.scrollHeight;\n var clientLength = this.props.horizontal ? ev.target.clientWidth : ev.target.clientHeight;\n var isEventTargetScrollable = scrollLength > clientLength;\n var delta = this.props.horizontal ? ev.deltaX || ev.wheelDeltaX : ev.deltaY || ev.wheelDeltaY;\n var leftoverDelta = delta;\n if (isEventTargetScrollable) {\n leftoverDelta = delta < 0 ? Math.min(delta + scrollOffset, 0) : Math.max(delta - (scrollLength - clientLength - scrollOffset), 0);\n }\n var targetDelta = delta - leftoverDelta;\n if (this.props.inverted && this._scrollRef && this._scrollRef.getScrollableNode) {\n var node = this._scrollRef.getScrollableNode();\n if (this.props.horizontal) {\n ev.target.scrollLeft += targetDelta;\n var nextScrollLeft = node.scrollLeft - leftoverDelta;\n node.scrollLeft = !this.props.getItemLayout ? Math.min(nextScrollLeft, this._totalCellLength) : nextScrollLeft;\n } else {\n ev.target.scrollTop += targetDelta;\n var nextScrollTop = node.scrollTop - leftoverDelta;\n node.scrollTop = !this.props.getItemLayout ? Math.min(nextScrollTop, this._totalCellLength) : nextScrollTop;\n }\n ev.preventDefault();\n }\n };\n }\n _checkProps(props) {\n var onScroll = props.onScroll,\n windowSize = props.windowSize,\n getItemCount = props.getItemCount,\n data = props.data,\n initialScrollIndex = props.initialScrollIndex;\n invariant(\n // $FlowFixMe[prop-missing]\n !onScroll || !onScroll.__isNative, 'Components based on VirtualizedList must be wrapped with Animated.createAnimatedComponent ' + 'to support native onScroll events with useNativeDriver');\n invariant(windowSizeOrDefault(windowSize) > 0, 'VirtualizedList: The windowSize prop must be present and set to a value greater than 0.');\n invariant(getItemCount, 'VirtualizedList: The \"getItemCount\" prop must be provided');\n var itemCount = getItemCount(data);\n if (initialScrollIndex != null && !this._hasTriggeredInitialScrollToIndex && (initialScrollIndex < 0 || itemCount > 0 && initialScrollIndex >= itemCount) && !this._hasWarned.initialScrollIndex) {\n console.warn(\"initialScrollIndex \\\"\" + initialScrollIndex + \"\\\" is not valid (list has \" + itemCount + \" items)\");\n this._hasWarned.initialScrollIndex = true;\n }\n if (__DEV__ && !this._hasWarned.flexWrap) {\n // $FlowFixMe[underconstrained-implicit-instantiation]\n var flatStyles = StyleSheet.flatten(this.props.contentContainerStyle);\n if (flatStyles != null && flatStyles.flexWrap === 'wrap') {\n console.warn('`flexWrap: `wrap`` is not supported with the `VirtualizedList` components.' + 'Consider using `numColumns` with `FlatList` instead.');\n this._hasWarned.flexWrap = true;\n }\n }\n }\n static _createRenderMask(props, cellsAroundViewport, additionalRegions) {\n var itemCount = props.getItemCount(props.data);\n invariant(cellsAroundViewport.first >= 0 && cellsAroundViewport.last >= cellsAroundViewport.first - 1 && cellsAroundViewport.last < itemCount, \"Invalid cells around viewport \\\"[\" + cellsAroundViewport.first + \", \" + cellsAroundViewport.last + \"]\\\" was passed to VirtualizedList._createRenderMask\");\n var renderMask = new CellRenderMask(itemCount);\n if (itemCount > 0) {\n var allRegions = [cellsAroundViewport, ...(additionalRegions !== null && additionalRegions !== void 0 ? additionalRegions : [])];\n for (var _i2 = 0, _allRegions = allRegions; _i2 < _allRegions.length; _i2++) {\n var region = _allRegions[_i2];\n renderMask.addCells(region);\n }\n\n // The initially rendered cells are retained as part of the\n // \"scroll-to-top\" optimization\n if (props.initialScrollIndex == null || props.initialScrollIndex <= 0) {\n var initialRegion = VirtualizedList._initialRenderRegion(props);\n renderMask.addCells(initialRegion);\n }\n\n // The layout coordinates of sticker headers may be off-screen while the\n // actual header is on-screen. Keep the most recent before the viewport\n // rendered, even if its layout coordinates are not in viewport.\n var stickyIndicesSet = new Set(props.stickyHeaderIndices);\n VirtualizedList._ensureClosestStickyHeader(props, stickyIndicesSet, renderMask, cellsAroundViewport.first);\n }\n return renderMask;\n }\n static _initialRenderRegion(props) {\n var _props$initialScrollI;\n var itemCount = props.getItemCount(props.data);\n var firstCellIndex = Math.max(0, Math.min(itemCount - 1, Math.floor((_props$initialScrollI = props.initialScrollIndex) !== null && _props$initialScrollI !== void 0 ? _props$initialScrollI : 0)));\n var lastCellIndex = Math.min(itemCount, firstCellIndex + initialNumToRenderOrDefault(props.initialNumToRender)) - 1;\n return {\n first: firstCellIndex,\n last: lastCellIndex\n };\n }\n static _ensureClosestStickyHeader(props, stickyIndicesSet, renderMask, cellIdx) {\n var stickyOffset = props.ListHeaderComponent ? 1 : 0;\n for (var itemIdx = cellIdx - 1; itemIdx >= 0; itemIdx--) {\n if (stickyIndicesSet.has(itemIdx + stickyOffset)) {\n renderMask.addCells({\n first: itemIdx,\n last: itemIdx\n });\n break;\n }\n }\n }\n _adjustCellsAroundViewport(props, cellsAroundViewport) {\n var data = props.data,\n getItemCount = props.getItemCount;\n var onEndReachedThreshold = onEndReachedThresholdOrDefault(props.onEndReachedThreshold);\n var _this$_scrollMetrics = this._scrollMetrics,\n contentLength = _this$_scrollMetrics.contentLength,\n offset = _this$_scrollMetrics.offset,\n visibleLength = _this$_scrollMetrics.visibleLength;\n var distanceFromEnd = contentLength - visibleLength - offset;\n\n // 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 return cellsAroundViewport.last >= getItemCount(data) ? VirtualizedList._constrainToItemCount(cellsAroundViewport, props) : cellsAroundViewport;\n }\n var newCellsAroundViewport;\n if (props.disableVirtualization) {\n var renderAhead = distanceFromEnd < onEndReachedThreshold * visibleLength ? maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch) : 0;\n newCellsAroundViewport = {\n first: 0,\n last: Math.min(cellsAroundViewport.last + renderAhead, getItemCount(data) - 1)\n };\n } else {\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\n // Thus, we want to recalculate the windowed render limits if any of the following hold:\n // - initialScrollIndex is undefined or is 0\n // - initialScrollIndex > 0 AND scrolling is complete\n // - initialScrollIndex > 0 AND the end of the list is visible (this handles the case\n // where the list is shorter than the visible area)\n if (props.initialScrollIndex && !this._scrollMetrics.offset && Math.abs(distanceFromEnd) >= Number.EPSILON) {\n return cellsAroundViewport.last >= getItemCount(data) ? VirtualizedList._constrainToItemCount(cellsAroundViewport, props) : cellsAroundViewport;\n }\n newCellsAroundViewport = computeWindowedRenderLimits(props, maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch), windowSizeOrDefault(props.windowSize), cellsAroundViewport, this.__getFrameMetricsApprox, this._scrollMetrics);\n invariant(newCellsAroundViewport.last < getItemCount(data), 'computeWindowedRenderLimits() should return range in-bounds');\n }\n if (this._nestedChildLists.size() > 0) {\n // 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 // Will this prevent rendering if the nested list doesn't realize the end?\n var childIdx = this._findFirstChildWithMore(newCellsAroundViewport.first, newCellsAroundViewport.last);\n newCellsAroundViewport.last = childIdx !== null && childIdx !== void 0 ? childIdx : newCellsAroundViewport.last;\n }\n return newCellsAroundViewport;\n }\n _findFirstChildWithMore(first, last) {\n for (var ii = first; ii <= last; ii++) {\n var cellKeyForIndex = this._indicesToKeys.get(ii);\n if (cellKeyForIndex != null && this._nestedChildLists.anyInCell(cellKeyForIndex, childList => childList.hasMore())) {\n return ii;\n }\n }\n return null;\n }\n componentDidMount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.registerAsNestedChild({\n ref: this,\n cellKey: this.context.cellKey\n });\n }\n\n // REACT-NATIVE-WEB patch to preserve during future RN merges: Support inverted wheel scroller.\n this.setupWebWheelHandler();\n }\n componentWillUnmount() {\n if (this._isNestedWithSameOrientation()) {\n this.context.unregisterAsNestedChild({\n ref: this\n });\n }\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n this._viewabilityTuples.forEach(tuple => {\n tuple.viewabilityHelper.dispose();\n });\n this._fillRateHelper.deactivateAndFlush();\n\n // REACT-NATIVE-WEB patch to preserve during future RN merges: Support inverted wheel scroller.\n this.teardownWebWheelHandler();\n }\n\n // REACT-NATIVE-WEB patch to preserve during future RN merges: Support inverted wheel scroller.\n setupWebWheelHandler() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n this._scrollRef.getScrollableNode().addEventListener('wheel', this.invertedWheelEventHandler);\n } else {\n setTimeout(() => this.setupWebWheelHandler(), 50);\n return;\n }\n }\n\n // REACT-NATIVE-WEB patch to preserve during future RN merges: Support inverted wheel scroller.\n teardownWebWheelHandler() {\n if (this._scrollRef && this._scrollRef.getScrollableNode) {\n this._scrollRef.getScrollableNode().removeEventListener('wheel', this.invertedWheelEventHandler);\n }\n }\n static getDerivedStateFromProps(newProps, prevState) {\n // 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 var itemCount = newProps.getItemCount(newProps.data);\n if (itemCount === prevState.renderMask.numCells()) {\n return prevState;\n }\n var constrainedCells = VirtualizedList._constrainToItemCount(prevState.cellsAroundViewport, newProps);\n return {\n cellsAroundViewport: constrainedCells,\n renderMask: VirtualizedList._createRenderMask(newProps, constrainedCells)\n };\n }\n _pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, first, last, inversionStyle) {\n var _this = this;\n var _this$props4 = this.props,\n CellRendererComponent = _this$props4.CellRendererComponent,\n ItemSeparatorComponent = _this$props4.ItemSeparatorComponent,\n ListHeaderComponent = _this$props4.ListHeaderComponent,\n ListItemComponent = _this$props4.ListItemComponent,\n data = _this$props4.data,\n debug = _this$props4.debug,\n getItem = _this$props4.getItem,\n getItemCount = _this$props4.getItemCount,\n getItemLayout = _this$props4.getItemLayout,\n horizontal = _this$props4.horizontal,\n renderItem = _this$props4.renderItem;\n var stickyOffset = ListHeaderComponent ? 1 : 0;\n var end = getItemCount(data) - 1;\n var prevCellKey;\n last = Math.min(end, last);\n var _loop = function _loop() {\n var item = getItem(data, ii);\n var key = _this._keyExtractor(item, ii, _this.props);\n _this._indicesToKeys.set(ii, key);\n if (stickyIndicesFromProps.has(ii + stickyOffset)) {\n stickyHeaderIndices.push(cells.length);\n }\n var shouldListenForLayout = getItemLayout == null || debug || _this._fillRateHelper.enabled();\n cells.push(/*#__PURE__*/React.createElement(CellRenderer, _extends({\n CellRendererComponent: CellRendererComponent,\n ItemSeparatorComponent: ii < end ? ItemSeparatorComponent : undefined,\n ListItemComponent: ListItemComponent,\n cellKey: key,\n horizontal: horizontal,\n index: ii,\n inversionStyle: inversionStyle,\n item: item,\n key: key,\n prevCellKey: prevCellKey,\n onUpdateSeparators: _this._onUpdateSeparators,\n onCellFocusCapture: e => _this._onCellFocusCapture(key),\n onUnmount: _this._onCellUnmount,\n ref: _ref => {\n _this._cellRefs[key] = _ref;\n },\n renderItem: renderItem\n }, shouldListenForLayout && {\n onCellLayout: _this._onCellLayout\n })));\n prevCellKey = key;\n };\n for (var ii = first; ii <= last; ii++) {\n _loop();\n }\n }\n static _constrainToItemCount(cells, props) {\n var itemCount = props.getItemCount(props.data);\n var last = Math.min(itemCount - 1, cells.last);\n var maxToRenderPerBatch = maxToRenderPerBatchOrDefault(props.maxToRenderPerBatch);\n return {\n first: clamp(0, itemCount - 1 - maxToRenderPerBatch, cells.first),\n last\n };\n }\n _isNestedWithSameOrientation() {\n var nestedContext = this.context;\n return !!(nestedContext && !!nestedContext.horizontal === horizontalOrDefault(this.props.horizontal));\n }\n _keyExtractor(item, index, props\n // $FlowFixMe[missing-local-annot]\n ) {\n if (props.keyExtractor != null) {\n return props.keyExtractor(item, index);\n }\n var key = defaultKeyExtractor(item, index);\n if (key === String(index)) {\n _usedIndexForKey = true;\n if (item.type && item.type.displayName) {\n _keylessItemComponentName = item.type.displayName;\n }\n }\n return key;\n }\n render() {\n this._checkProps(this.props);\n var _this$props5 = this.props,\n ListEmptyComponent = _this$props5.ListEmptyComponent,\n ListFooterComponent = _this$props5.ListFooterComponent,\n ListHeaderComponent = _this$props5.ListHeaderComponent;\n var _this$props6 = this.props,\n data = _this$props6.data,\n horizontal = _this$props6.horizontal;\n var inversionStyle = this.props.inverted ? horizontalOrDefault(this.props.horizontal) ? styles.horizontallyInverted : styles.verticallyInverted : null;\n var cells = [];\n var stickyIndicesFromProps = new Set(this.props.stickyHeaderIndices);\n var stickyHeaderIndices = [];\n\n // 1. Add cell for ListHeaderComponent\n if (ListHeaderComponent) {\n if (stickyIndicesFromProps.has(0)) {\n stickyHeaderIndices.push(0);\n }\n var _element = /*#__PURE__*/React.isValidElement(ListHeaderComponent) ? ListHeaderComponent :\n /*#__PURE__*/\n // $FlowFixMe[not-a-component]\n // $FlowFixMe[incompatible-type-arg]\n React.createElement(ListHeaderComponent, null);\n cells.push(/*#__PURE__*/React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getCellKey() + '-header',\n key: \"$header\"\n }, /*#__PURE__*/React.createElement(View, {\n onLayout: this._onLayoutHeader,\n style: [inversionStyle, this.props.ListHeaderComponentStyle]\n },\n // $FlowFixMe[incompatible-type] - Typing ReactNativeComponent revealed errors\n _element)));\n }\n\n // 2a. Add a cell for ListEmptyComponent if applicable\n var itemCount = this.props.getItemCount(data);\n if (itemCount === 0 && ListEmptyComponent) {\n var _element2 = /*#__PURE__*/React.isValidElement(ListEmptyComponent) ? ListEmptyComponent :\n /*#__PURE__*/\n // $FlowFixMe[not-a-component]\n // $FlowFixMe[incompatible-type-arg]\n React.createElement(ListEmptyComponent, null);\n cells.push(/*#__PURE__*/React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getCellKey() + '-empty',\n key: \"$empty\"\n }, /*#__PURE__*/React.cloneElement(_element2, {\n onLayout: event => {\n this._onLayoutEmpty(event);\n if (_element2.props.onLayout) {\n _element2.props.onLayout(event);\n }\n },\n style: [inversionStyle, _element2.props.style]\n })));\n }\n\n // 2b. Add cells and spacers for each item\n if (itemCount > 0) {\n _usedIndexForKey = false;\n _keylessItemComponentName = '';\n var spacerKey = this._getSpacerKey(!horizontal);\n var renderRegions = this.state.renderMask.enumerateRegions();\n var lastSpacer = findLastWhere(renderRegions, r => r.isSpacer);\n for (var _iterator = _createForOfIteratorHelperLoose(renderRegions), _step; !(_step = _iterator()).done;) {\n var section = _step.value;\n if (section.isSpacer) {\n // Legacy behavior is to avoid spacers when virtualization is\n // disabled (including head spacers on initial render).\n if (this.props.disableVirtualization) {\n continue;\n }\n\n // 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 var isLastSpacer = section === lastSpacer;\n var constrainToMeasured = isLastSpacer && !this.props.getItemLayout;\n var last = constrainToMeasured ? clamp(section.first - 1, section.last, this._highestMeasuredFrameIndex) : section.last;\n var firstMetrics = this.__getFrameMetricsApprox(section.first, this.props);\n var lastMetrics = this.__getFrameMetricsApprox(last, this.props);\n var spacerSize = lastMetrics.offset + lastMetrics.length - firstMetrics.offset;\n cells.push(/*#__PURE__*/React.createElement(View, {\n key: \"$spacer-\" + section.first,\n style: {\n [spacerKey]: spacerSize\n }\n }));\n } else {\n this._pushCells(cells, stickyHeaderIndices, stickyIndicesFromProps, section.first, section.last, inversionStyle);\n }\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\n // 3. Add cell for ListFooterComponent\n if (ListFooterComponent) {\n var _element3 = /*#__PURE__*/React.isValidElement(ListFooterComponent) ? ListFooterComponent :\n /*#__PURE__*/\n // $FlowFixMe[not-a-component]\n // $FlowFixMe[incompatible-type-arg]\n React.createElement(ListFooterComponent, null);\n cells.push(/*#__PURE__*/React.createElement(VirtualizedListCellContextProvider, {\n cellKey: this._getFooterCellKey(),\n key: \"$footer\"\n }, /*#__PURE__*/React.createElement(View, {\n onLayout: this._onLayoutFooter,\n style: [inversionStyle, this.props.ListFooterComponentStyle]\n },\n // $FlowFixMe[incompatible-type] - Typing ReactNativeComponent revealed errors\n _element3)));\n }\n\n // 4. Render the ScrollView\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: scrollEventThrottleOrDefault(this.props.scrollEventThrottle),\n // TODO: Android support\n invertStickyHeaders: this.props.invertStickyHeaders !== undefined ? this.props.invertStickyHeaders : this.props.inverted,\n stickyHeaderIndices,\n style: inversionStyle ? [inversionStyle, this.props.style] : this.props.style\n });\n this._hasMore = this.state.cellsAroundViewport.last < itemCount - 1;\n var innerRet = /*#__PURE__*/React.createElement(VirtualizedListContextProvider, {\n value: {\n cellKey: null,\n getScrollMetrics: this._getScrollMetrics,\n horizontal: horizontalOrDefault(this.props.horizontal),\n getOutermostParentListRef: this._getOutermostParentListRef,\n registerAsNestedChild: this._registerAsNestedChild,\n unregisterAsNestedChild: this._unregisterAsNestedChild\n }\n }, /*#__PURE__*/React.cloneElement((this.props.renderScrollComponent || this._defaultRenderScrollComponent)(scrollProps), {\n ref: this._captureScrollRef\n }, cells));\n var ret = innerRet;\n /* https://github.com/necolas/react-native-web/issues/2239: Re-enable when ScrollView.Context.Consumer is available.\n if (__DEV__) {\n ret = (\n \n {scrollContext => {\n if (\n scrollContext != null &&\n !scrollContext.horizontal ===\n !horizontalOrDefault(this.props.horizontal) &&\n !this._hasWarned.nesting &&\n this.context == null &&\n this.props.scrollEnabled !== false\n ) {\n // TODO (T46547044): use React.warn once 16.9 is sync'd: https://github.com/facebook/react/pull/15170\n console.error(\n 'VirtualizedLists should never be nested inside plain ScrollViews with the same ' +\n 'orientation because it can break windowing and other functionality - use another ' +\n 'VirtualizedList-backed container instead.',\n );\n this._hasWarned.nesting = true;\n }\n return innerRet;\n }}\n \n );\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 componentDidUpdate(prevProps) {\n var _this$props7 = this.props,\n data = _this$props7.data,\n extraData = _this$props7.extraData;\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(tuple => {\n tuple.viewabilityHelper.resetViewableIndices();\n });\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 var hiPriInProgress = this._hiPriInProgress;\n this._scheduleCellsToRenderUpdate();\n // Make sure setting `this._hiPriInProgress` back to false after `componentDidUpdate`\n // is triggered with `this._hiPriInProgress = true`\n if (hiPriInProgress) {\n this._hiPriInProgress = false;\n }\n }\n\n // Used for preventing scrollToIndex from being called multiple times for initialScrollIndex\n\n // flag to prevent infinite hiPri cell limit update\n\n // $FlowFixMe[missing-local-annot]\n\n /* $FlowFixMe[missing-local-annot] The type annotation(s) required by Flow's\n * LTI update could not be added via codemod */\n\n _computeBlankness() {\n this._fillRateHelper.computeBlankness(this.props, this.state.cellsAroundViewport, this._scrollMetrics);\n }\n\n /* $FlowFixMe[missing-local-annot] The type annotation(s) required by Flow's\n * LTI update could not be added via codemod */\n\n _onCellFocusCapture(cellKey) {\n this._lastFocusedCellKey = cellKey;\n this._updateCellsToRender();\n }\n _triggerRemeasureForChildListsInCell(cellKey) {\n this._nestedChildLists.forEachInCell(cellKey, childList => {\n childList.measureLayoutRelativeToContainingList();\n });\n }\n measureLayoutRelativeToContainingList() {\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 }\n // We are assuming that getOutermostParentListRef().getScrollRef()\n // is a non-null reference to a ScrollView\n this._scrollRef.measureLayout(this.context.getOutermostParentListRef().getScrollRef(), (x, y, width, height) => {\n this._offsetFromParentVirtualizedList = this._selectOffset({\n x,\n y\n });\n this._scrollMetrics.contentLength = this._selectLength({\n width,\n height\n });\n var scrollMetrics = this._convertParentScrollMetrics(this.context.getScrollMetrics());\n var metricsChanged = this._scrollMetrics.visibleLength !== scrollMetrics.visibleLength || this._scrollMetrics.offset !== scrollMetrics.offset;\n if (metricsChanged) {\n this._scrollMetrics.visibleLength = scrollMetrics.visibleLength;\n this._scrollMetrics.offset = scrollMetrics.offset;\n\n // If metrics of the scrollView changed, then we triggered remeasure for child list\n // to ensure VirtualizedList has the right information.\n this._nestedChildLists.forEach(childList => {\n childList.measureLayoutRelativeToContainingList();\n });\n }\n }, 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 _getFooterCellKey() {\n return this._getCellKey() + '-footer';\n }\n // $FlowFixMe[missing-local-annot]\n _renderDebugOverlay() {\n var normalize = this._scrollMetrics.visibleLength / (this._scrollMetrics.contentLength || 1);\n var framesInLayout = [];\n var itemCount = this.props.getItemCount(this.props.data);\n for (var ii = 0; ii < itemCount; ii++) {\n var frame = this.__getFrameMetricsApprox(ii, this.props);\n /* $FlowFixMe[prop-missing] (>=0.68.0 site=react_native_fb) This comment\n * suppresses an error found when Flow v0.68 was deployed. To see the\n * error delete this comment and run Flow. */\n if (frame.inLayout) {\n framesInLayout.push(frame);\n }\n }\n var windowTop = this.__getFrameMetricsApprox(this.state.cellsAroundViewport.first, this.props).offset;\n var frameLast = this.__getFrameMetricsApprox(this.state.cellsAroundViewport.last, this.props);\n var windowLen = frameLast.offset + frameLast.length - windowTop;\n var visTop = this._scrollMetrics.offset;\n var visLen = this._scrollMetrics.visibleLength;\n return /*#__PURE__*/React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlay]\n }, framesInLayout.map((f, ii) => /*#__PURE__*/React.createElement(View, {\n key: 'f' + ii,\n style: [styles.debugOverlayBase, styles.debugOverlayFrame, {\n top: f.offset * normalize,\n height: f.length * normalize\n }]\n })), /*#__PURE__*/React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlayFrameLast, {\n top: windowTop * normalize,\n height: windowLen * normalize\n }]\n }), /*#__PURE__*/React.createElement(View, {\n style: [styles.debugOverlayBase, styles.debugOverlayFrameVis, {\n top: visTop * normalize,\n height: visLen * normalize\n }]\n }));\n }\n _selectLength(metrics) {\n return !horizontalOrDefault(this.props.horizontal) ? metrics.height : metrics.width;\n }\n _selectOffset(metrics) {\n return !horizontalOrDefault(this.props.horizontal) ? metrics.y : metrics.x;\n }\n _maybeCallOnEdgeReached() {\n var _this$props8 = this.props,\n data = _this$props8.data,\n getItemCount = _this$props8.getItemCount,\n onStartReached = _this$props8.onStartReached,\n onStartReachedThreshold = _this$props8.onStartReachedThreshold,\n onEndReached = _this$props8.onEndReached,\n onEndReachedThreshold = _this$props8.onEndReachedThreshold,\n initialScrollIndex = _this$props8.initialScrollIndex;\n var _this$_scrollMetrics2 = this._scrollMetrics,\n contentLength = _this$_scrollMetrics2.contentLength,\n visibleLength = _this$_scrollMetrics2.visibleLength,\n offset = _this$_scrollMetrics2.offset;\n var distanceFromStart = offset;\n var distanceFromEnd = contentLength - visibleLength - offset;\n\n // Especially when oERT is zero it's necessary to 'floor' very small distance values to be 0\n // since debouncing causes us to not fire this event for every single \"pixel\" we scroll and can thus\n // be at the edge of the list with a distance approximating 0 but not quite there.\n if (distanceFromStart < ON_EDGE_REACHED_EPSILON) {\n distanceFromStart = 0;\n }\n if (distanceFromEnd < ON_EDGE_REACHED_EPSILON) {\n distanceFromEnd = 0;\n }\n\n // TODO: T121172172 Look into why we're \"defaulting\" to a threshold of 2px\n // when oERT is not present (different from 2 viewports used elsewhere)\n var DEFAULT_THRESHOLD_PX = 2;\n var startThreshold = onStartReachedThreshold != null ? onStartReachedThreshold * visibleLength : DEFAULT_THRESHOLD_PX;\n var endThreshold = onEndReachedThreshold != null ? onEndReachedThreshold * visibleLength : DEFAULT_THRESHOLD_PX;\n var isWithinStartThreshold = distanceFromStart <= startThreshold;\n var isWithinEndThreshold = distanceFromEnd <= endThreshold;\n\n // First check if the user just scrolled within the end threshold\n // and call onEndReached only once for a given content length,\n // and only if onStartReached is not being executed\n if (onEndReached && this.state.cellsAroundViewport.last === getItemCount(data) - 1 && isWithinEndThreshold && this._scrollMetrics.contentLength !== this._sentEndForContentLength) {\n this._sentEndForContentLength = this._scrollMetrics.contentLength;\n onEndReached({\n distanceFromEnd\n });\n }\n\n // Next check if the user just scrolled within the start threshold\n // and call onStartReached only once for a given content length,\n // and only if onEndReached is not being executed\n else if (onStartReached != null && this.state.cellsAroundViewport.first === 0 && isWithinStartThreshold && this._scrollMetrics.contentLength !== this._sentStartForContentLength) {\n // On initial mount when using initialScrollIndex the offset will be 0 initially\n // and will trigger an unexpected onStartReached. To avoid this we can use\n // timestamp to differentiate between the initial scroll metrics and when we actually\n // received the first scroll event.\n if (!initialScrollIndex || this._scrollMetrics.timestamp !== 0) {\n this._sentStartForContentLength = this._scrollMetrics.contentLength;\n onStartReached({\n distanceFromStart\n });\n }\n }\n\n // If the user scrolls away from the start or end and back again,\n // cause onStartReached or onEndReached to be triggered again\n else {\n this._sentStartForContentLength = isWithinStartThreshold ? this._sentStartForContentLength : 0;\n this._sentEndForContentLength = isWithinEndThreshold ? this._sentEndForContentLength : 0;\n }\n }\n\n /* Translates metrics from a scroll event in a parent VirtualizedList into\n * coordinates relative to the child list.\n */\n\n _scheduleCellsToRenderUpdate() {\n var _this$state$cellsArou = this.state.cellsAroundViewport,\n first = _this$state$cellsArou.first,\n last = _this$state$cellsArou.last;\n var _this$_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 onStartReachedThreshold = onStartReachedThresholdOrDefault(this.props.onStartReachedThreshold);\n var onEndReachedThreshold = onEndReachedThresholdOrDefault(this.props.onEndReachedThreshold);\n // 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 if (first > 0) {\n var distTop = offset - this.__getFrameMetricsApprox(first, this.props).offset;\n hiPri = distTop < 0 || velocity < -2 && distTop < getScrollingThreshold(onStartReachedThreshold, visibleLength);\n }\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 if (!hiPri && last >= 0 && last < itemCount - 1) {\n var distBottom = this.__getFrameMetricsApprox(last, this.props).offset - (offset + visibleLength);\n hiPri = distBottom < 0 || velocity > 2 && distBottom < getScrollingThreshold(onEndReachedThreshold, visibleLength);\n }\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 if (hiPri && (this._averageCellLength || this.props.getItemLayout) && !this._hiPriInProgress) {\n this._hiPriInProgress = true;\n // Don't worry about interactions when scrolling quickly; focus on filling content as fast\n // as possible.\n this._updateCellsToRenderBatcher.dispose({\n abort: true\n });\n this._updateCellsToRender();\n return;\n } else {\n this._updateCellsToRenderBatcher.schedule();\n }\n }\n\n /**\n * Gets an approximate offset to an item at a given index. Supports\n * fractional indices.\n */\n\n _updateViewableItems(props, cellsAroundViewport) {\n this._viewabilityTuples.forEach(tuple => {\n tuple.viewabilityHelper.onUpdate(props, this._scrollMetrics.offset, this._scrollMetrics.visibleLength, this._getFrameMetrics, this._createViewToken, tuple.onViewableItemsChanged, cellsAroundViewport);\n });\n }\n}\nVirtualizedList.contextType = VirtualizedListContext;\nvar styles = StyleSheet.create({\n verticallyInverted: {\n transform: 'scaleY(-1)'\n },\n horizontallyInverted: {\n transform: 'scaleX(-1)'\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 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