ungroupColumns method

void ungroupColumns(int fromColumn, int toColumn)

Removes one outline level from columns fromColumn-toColumn and un-hides them.

Implementation

void ungroupColumns(int fromColumn, int toColumn) {
  if (fromColumn < 0 || toColumn < fromColumn) return;
  for (var c = fromColumn; c <= toColumn; c++) {
    final cur = _columnOutlineLevel[c] ?? 0;
    if (cur <= 1) {
      _columnOutlineLevel.remove(c);
    } else {
      _columnOutlineLevel[c] = cur - 1;
    }
    _columnHidden.remove(c);
  }
  _columnCollapsed.remove(toColumn + 1);
}