class Prawn::Table::Cells

def index_cells


Make sure to call this before using @rows or @columns.

the object graph, the ones that are only there to be iterated over.
Cells object. Without this, we would needlessly index the leaf nodes of
Defers indexing until rows() or columns() is actually called on the 
def index_cells
  @rows = {}
  @columns = {}
  each do |cell|
    @rows[cell.row] ||= []
    @rows[cell.row] << cell
    @columns[cell.column] ||= []
    @columns[cell.column] << cell
  end
  @first_row    = @rows.keys.min
  @first_column = @columns.keys.min
  @row_count    = @rows.size
  @column_count = @columns.size
  @indexed = true
end