gtk-print-unix-dialog-manual-capabilities (object)

object -- a gtk-print-unix-dialog widget
capabilities -- the printing capabilities of type gtk-print-capabilities of the application

Accessor of the manual-capabilities slot of the gtk-print-unix-dialog class.

This lets you specify the printing capabilities your application supports. For instance, if you can handle scaling the output then you pass :scale. If you do not pass that, then the dialog will only let you select the scale if the printing system automatically handles scaling.