class Prawn::Table

def add_one_header_row(page_of_cells, x_offset, y, row, row_of_header=nil)


Return the height of the header.

this page.
any Cells built for this page) immediately prior to the first data row on
Number the row with the given +row+ index, so that the header appears (in
Add the header row(s) to the given array of cells at the given y-position. 
def add_one_header_row(page_of_cells, x_offset, y, row, row_of_header=nil)
  rows_to_operate_on = @header_row
  rows_to_operate_on = @header_row.rows(row_of_header) if row_of_header
  rows_to_operate_on.each do |cell|
    cell.row = row
    cell.dummy_cells.each {|c| 
      if cell.rowspan > 1
        # be sure to account for cells that span multiple rows
        # in this case you need multiple row numbers
        c.row += row
      else
        c.row = row
      end
    }
    page_of_cells << [cell, [cell.x + x_offset, y]]
  end
  rows_to_operate_on.height
end