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

object -- a gtk:print-unix-dialog widget
capabilities -- a gtk:print-capabilities value for the printing capabilities of the application

The accessor for the manual-capabilities slot of the gtk:print-unix-dialog class gets or sets the capabilities the application can handle. This lets you specify the printing capabilities your application supports. For instance, if you can handle scaling the output then you pass the :scale value. If you do not pass that, then the dialog will only let you select the scale if the printing system automatically handles scaling.