This must be set to a positive number before the rendering
starts. It may be set in a [signal@Gtk.PrintOperation::begin-print]
signal handler.
Note that the page numbers passed to the
[signal@Gtk.PrintOperation::request-page-setup]
and [signal@Gtk.PrintOperation::draw-page] signals are 0-based, i.e.
if the user chooses to print all pages, the last ::draw-page signal
will be for page @n_pages - 1.
Sets the number of pages in the document.
This must be set to a positive number before the rendering starts. It may be set in a [signal@Gtk.PrintOperation::begin-print] signal handler.
Note that the page numbers passed to the [signal@Gtk.PrintOperation::request-page-setup] and [signal@Gtk.PrintOperation::draw-page] signals are 0-based, i.e. if the user chooses to print all pages, the last ::draw-page signal will be for page @n_pages - 1.