| Returns the group header cell.
The size of the header cell is computed based on the following rules
(only the row header rules are listed, the ones for columns can be
deducted by simmetrical duality):
- the width of the header is given by
JRCrosstabRowGroup.getWidth JRCrosstabRowGroup.getWidth()
- the height of the last row group header is given by the height of the base cell
- the height of a non-last row group header is the sum of the next group header's height and
the next group total header's height (0 if the next group doesn't have a total header)
Should never return null, but empty cell contents instead.
the group header cell |