addRow method

void addRow (List<RenderBox> cells)

Adds a row to the end of the table.

The newly added children must not already have parents.

Implementation 

void addRow(List<RenderBox> cells) {
  assert(cells.length == columns);
  assert(_children.length == rows * columns);
  _rows += 1;
  _children.addAll(cells);
  for (RenderBox cell in cells) {
    if (cell != null)
      adoptChild(cell);
  }
  markNeedsLayout();
}