PrintOperation.connectDrawPage

Connect to DrawPage signal.

Emitted for every page that is printed.

The signal handler must render the page_nr's page onto the cairo context obtained from context using gtk.print_context.PrintContext.getCairoContext.

static void
  draw_page (GtkPrintOperation *operation,
             GtkPrintContext   *context,
             int                page_nr,
             gpointer           user_data)
  {
    cairo_t *cr;
    PangoLayout *layout;
    double width, text_height;
    int layout_height;
    PangoFontDescription *desc;

    cr = gtk_print_context_get_cairo_context (context);
    width = gtk_print_context_get_width (context);

    cairo_rectangle (cr, 0, 0, width, HEADER_HEIGHT);

    cairo_set_source_rgb (cr, 0.8, 0.8, 0.8);
    cairo_fill (cr);

    layout = gtk_print_context_create_pango_layout (context);

    desc = pango_font_description_from_string ("sans 14");
    pango_layout_set_font_description (layout, desc);
    pango_font_description_free (desc);

    pango_layout_set_text (layout, "some text", -1);
    pango_layout_set_width (layout, width * PANGO_SCALE);
    pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);

    pango_layout_get_size (layout, NULL, &layout_height);
    text_height = (double)layout_height / PANGO_SCALE;

    cairo_move_to (cr, width / 2,  (HEADER_HEIGHT - text_height) / 2);
    pango_cairo_show_layout (cr, layout);

    g_object_unref (layout);
  }

Use gtk.print_operation.PrintOperation.setUseFullPage and gtk.print_operation.PrintOperation.setUnit before starting the print operation to set up the transformation of the cairo context according to your needs.