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Viewing file:     calculateSizeAndPositionDataAndUpdateScrollOffset.js (1.27 KB)      -rw-r--r--

/**
 * Helper method that determines when to recalculate row or column metadata.
 */
export default function calculateSizeAndPositionDataAndUpdateScrollOffset(_ref) {
  var cellCount = _ref.cellCount,
      cellSize = _ref.cellSize,
      computeMetadataCallback = _ref.computeMetadataCallback,
      computeMetadataCallbackProps = _ref.computeMetadataCallbackProps,
      nextCellsCount = _ref.nextCellsCount,
      nextCellSize = _ref.nextCellSize,
      nextScrollToIndex = _ref.nextScrollToIndex,
      scrollToIndex = _ref.scrollToIndex,
      updateScrollOffsetForScrollToIndex = _ref.updateScrollOffsetForScrollToIndex;

  // Don't compare cell sizes if they are functions because inline functions would cause infinite loops.
  // In that event users should use the manual recompute methods to inform of changes.
  if (cellCount !== nextCellsCount || (typeof cellSize === 'number' || typeof nextCellSize === 'number') && cellSize !== nextCellSize) {
    computeMetadataCallback(computeMetadataCallbackProps); // Updated cell metadata may have hidden the previous scrolled-to item.
    // In this case we should also update the scrollTop to ensure it stays visible.

    if (scrollToIndex >= 0 && scrollToIndex === nextScrollToIndex) {
      updateScrollOffsetForScrollToIndex();
    }
  }
}