react-virtualized/dist/es/Collection/utils/calculateSizeAndPositionData.js

React components for efficiently rendering large, scrollable lists and tabular data

import SectionManager from '../SectionManager';

export default function calculateSizeAndPositionData(_ref) {
  var cellCount = _ref.cellCount,
      cellSizeAndPositionGetter = _ref.cellSizeAndPositionGetter,
      sectionSize = _ref.sectionSize;

  var cellMetadata = [];
  var sectionManager = new SectionManager(sectionSize);
  var height = 0;
  var width = 0;

  for (var index = 0; index < cellCount; index++) {
    var cellMetadatum = cellSizeAndPositionGetter({ index: index });

    if (cellMetadatum.height == null || isNaN(cellMetadatum.height) || cellMetadatum.width == null || isNaN(cellMetadatum.width) || cellMetadatum.x == null || isNaN(cellMetadatum.x) || cellMetadatum.y == null || isNaN(cellMetadatum.y)) {
      throw Error('Invalid metadata returned for cell ' + index + ':\n        x:' + cellMetadatum.x + ', y:' + cellMetadatum.y + ', width:' + cellMetadatum.width + ', height:' + cellMetadatum.height);
    }

    height = Math.max(height, cellMetadatum.y + cellMetadatum.height);
    width = Math.max(width, cellMetadatum.x + cellMetadatum.width);

    cellMetadata[index] = cellMetadatum;
    sectionManager.registerCell({
      cellMetadatum: cellMetadatum,
      index: index
    });
  }

  return {
    cellMetadata: cellMetadata,
    height: height,
    sectionManager: sectionManager,
    width: width
  };
}