If null is supplied, the default font (i.e. the one being used for the
text) will be used instead.
font_name should be a
string representation of a font description Pango can understand.
(e.g. "Monospace 10"). See pango.font_description.FontDescription.fromString
for a description of the format of the string representation.
Sets the font for printing the page header.
If null is supplied, the default font (i.e. the one being used for the text) will be used instead.
font_name should be a string representation of a font description Pango can understand. (e.g. "Monospace 10"). See pango.font_description.FontDescription.fromString for a description of the format of the string representation.
This function cannot be called anymore after the first call to the gtksource.print_compositor.PrintCompositor.paginate function.