columnWidths property

Map<int, TableColumnWidth> columnWidths

How the horizontal extents of the columns of this table should be determined.

If the Map has a null entry for a given column, the table uses the defaultColumnWidth instead.

The layout performance of the table depends critically on which column sizing algorithms are used here. In particular, IntrinsicColumnWidth is quite expensive because it needs to measure each cell in the column to determine the intrinsic size of the column.

Implementation 

Map<int, TableColumnWidth> get columnWidths => Map<int, TableColumnWidth>.unmodifiable(_columnWidths);
void columnWidths= (Map<int, TableColumnWidth> value)

Implementation 

set columnWidths(Map<int, TableColumnWidth> value) {
  value ??= HashMap<int, TableColumnWidth>();
  if (_columnWidths == value)
    return;
  _columnWidths = value;
  markNeedsLayout();
}