+ ///
+ mutable pos_type sel_beg;
+ ///
+ mutable pos_type sel_end;
+private:
+ /// has the Row appearance changed since last drawing?
+ mutable bool changed_;
+ /// CRC of row contents.
+ mutable size_type crc_;
+ /// first pos covered by this row
+ pos_type pos_;
+ /// one behind last pos covered by this row
+ pos_type end_;
+ /// Row dimension.
+ Dimension dim_;