1 line
5.6 KiB
JSON
1 line
5.6 KiB
JSON
{"ast":null,"code":"import _slicedToArray from \"@babel/runtime/helpers/esm/slicedToArray\";\nimport * as React from 'react';\n\n/**\n * Size info need loop query for the `heights` which will has the perf issue.\n * Let cache result for each render phase.\n */\nexport function useGetSize(mergedData, getKey, heights, itemHeight) {\n var _React$useMemo = React.useMemo(function () {\n return [new Map(), []];\n }, [mergedData, heights.id, itemHeight]),\n _React$useMemo2 = _slicedToArray(_React$useMemo, 2),\n key2Index = _React$useMemo2[0],\n bottomList = _React$useMemo2[1];\n var getSize = function getSize(startKey) {\n var endKey = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : startKey;\n // Get from cache first\n var startIndex = key2Index.get(startKey);\n var endIndex = key2Index.get(endKey);\n\n // Loop to fill the cache\n if (startIndex === undefined || endIndex === undefined) {\n var dataLen = mergedData.length;\n for (var i = bottomList.length; i < dataLen; i += 1) {\n var _heights$get;\n var item = mergedData[i];\n var key = getKey(item);\n key2Index.set(key, i);\n var cacheHeight = (_heights$get = heights.get(key)) !== null && _heights$get !== void 0 ? 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