export default function MeasureColumnWidths()

in src/data-table/measure-column-widths.tsx [114:190]
66 lines of code
10 McCabe index (conditional complexity)

export default function MeasureColumnWidths({
  columns,
  rows,
  widths,
  isSelectable,
  onWidthsChange,
}: MeasureColumnWidthsProps) {
  const [css] = useStyletron();

  const widthMap = React.useMemo(() => {
    return new Map();
  }, [rows]);

  const sampleSize = rows.length < MAX_SAMPLE_SIZE ? rows.length : MAX_SAMPLE_SIZE;
  const finishedMeasurementCount = (sampleSize + 1) * columns.length;

  const sampleIndexes = React.useMemo<number[]>(() => {
    return generateSampleIndices(0, rows.length - 1, sampleSize);
  }, [columns, rows, widths, sampleSize]);

  const handleDimensionsChange = React.useCallback(
    (columnIndex: number, dimensions: { width: number; height: number }) => {
      const nextWidth = Math.min(
        Math.max(
          columns[columnIndex].minWidth || 0,
          widthMap.get(columnIndex) || 0,
          dimensions.width + 1
        ),
        columns[columnIndex].maxWidth || Infinity
      );

      if (nextWidth !== widthMap.get(columnIndex)) {
        widthMap.set(columnIndex, nextWidth);
      }
      if (
        // Refresh at 100% of done
        widthMap.size === columns.length ||
        // ...50%
        widthMap.size === Math.floor(columns.length / 2) ||
        // ...25%
        widthMap.size === Math.floor(columns.length / 4)
      ) {
        onWidthsChange(Array.from(widthMap.values()));
      }
    },
    [columns, rows, finishedMeasurementCount, onWidthsChange]
  );

  const hiddenStyle = css({
    position: 'absolute',
    overflow: 'hidden',
    height: 0,
  });

  // Remove the measurement nodes after we are done updating our column width
  if (widthMap.size === columns.length) {
    return null;
  }

  return (
    <div className={hiddenStyle} aria-hidden="true" role="none">
      {columns.map((column, i) => {
        return (
          <MeasureColumn
            key={column.title + i}
            column={column}
            rows={rows}
            isSelectable={isSelectable}
            onLayout={handleDimensionsChange}
            columnIndex={i}
            sampleIndexes={sampleIndexes}
          />
        );
      })}
    </div>
  );
}