gtk:print-operation-preview-render-page (preview page-nr)

preview -- a gtk:print-operation-preview object
page-nr -- the number of the page to render

Renders a page to the preview, using the print context that was passed to the "preview" handler together with preview. A custom print preview should use this function in its "expose" handler to render the currently selected page. Note that this function requires a suitable Cairo context to be associated with the print context.