findNearestRowForY method

Implementation

int findNearestRowForY(double y) {
  for (int i = 0; i < _rowTops.length; i += 1) {
    if (y <= _rowTops[i] + _rowHeights[i]) {
      return i;
    }
  }

  // Wasn't above, or within, any row. Must be below the bottom row.
  // Return the bottom row.
  return _rowTops.length - 1;
}