type Gtk_Print_Context_Record is new GObject_Record with null record;
type Gtk_Print_Context is access all Gtk_Print_Context_Record'Class;
function Get_Type return Glib.GType;
function Create_Pango_Context
( | Context | : not null access Gtk_Print_Context_Record) return Pango.Context.Pango_Context; |
function Create_Pango_Layout
( | Context | : not null access Gtk_Print_Context_Record) return Pango.Layout.Pango_Layout; |
function Get_Cairo_Context
( | Context | : not null access Gtk_Print_Context_Record) return Cairo.Cairo_Context; |
procedure Set_Cairo_Context
( | Context | : not null access Gtk_Print_Context_Record; |
Cr | : Cairo.Cairo_Context; | |
Dpi_X | : Gdouble; | |
Dpi_Y | : Gdouble); |
function Get_Dpi_X
( | Context | : not null access Gtk_Print_Context_Record) return Gdouble; |
function Get_Dpi_Y
( | Context | : not null access Gtk_Print_Context_Record) return Gdouble; |
function Get_Hard_Margins
( | Context | : not null access Gtk_Print_Context_Record; |
Top | : access Gdouble; | |
Bottom | : access Gdouble; | |
Left | : access Gdouble; | |
Right | : access Gdouble) return Boolean; |
function Get_Height
( | Context | : not null access Gtk_Print_Context_Record) return Gdouble; |
function Get_Page_Setup
( | Context | : not null access Gtk_Print_Context_Record) return Gtk.Page_Setup.Gtk_Page_Setup; |
function Get_Pango_Fontmap
( | Context | : not null access Gtk_Print_Context_Record) return Pango.Font_Map.Pango_Font_Map; |
function Get_Width
( | Context | : not null access Gtk_Print_Context_Record) return Gdouble; |
A GtkPrintContext encapsulates context information that is required when drawing pages for printing, such as the cairo context and important parameters like page size and resolution. It also lets you easily create Pango.Layout.Pango_Layout and Pango.Context.Pango_Context objects that match the font metrics of the cairo surface.
GtkPrintContext objects gets passed to the Gtk.Print_Operation.Gtk_Print_Operation::begin-print, Gtk.Print_Operation.Gtk_Print_Operation::end-print, Gtk.Print_Operation.Gtk_Print_Operation::request-page-setup and Gtk.Print_Operation.Gtk_Print_Operation::draw-page signals on the Gtk.Print_Operation.Gtk_Print_Operation. == Using GtkPrintContext in a Gtk.Print_Operation.Gtk_Print_Operation::draw-page callback == static void draw_page (GtkPrintOperation *operation, GtkPrintContext *context, int page_nr) { cairo_t *cr; PangoLayout *layout; PangoFontDescription *desc; cr = gtk_print_context_get_cairo_context (context); // Draw a red rectangle, as wide as the paper (inside the margins) cairo_set_source_rgb (cr, 1.0, 0, 0); cairo_rectangle (cr, 0, 0, gtk_print_context_get_width (context), 50); cairo_fill (cr); // Draw some lines cairo_move_to (cr, 20, 10); cairo_line_to (cr, 40, 20); cairo_arc (cr, 60, 60, 20, 0, M_PI); cairo_line_to (cr, 80, 20); cairo_set_source_rgb (cr, 0, 0, 0); cairo_set_line_width (cr, 5); cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND); cairo_stroke (cr); // Draw some text layout = gtk_print_context_create_layout (context); pango_layout_set_text (layout, "Hello World! Printing is easy", -1); desc = pango_font_description_from_string ("sans 28"); pango_layout_set_font_description (layout, desc); pango_font_description_free (desc); cairo_move_to (cr, 30, 20); pango_cairo_layout_path (cr, layout); // Font Outline cairo_set_source_rgb (cr, 0.93, 1.0, 0.47); cairo_set_line_width (cr, 0.5); cairo_stroke_preserve (cr); // Font Fill cairo_set_source_rgb (cr, 0, 0.0, 1.0); cairo_fill (cr); g_object_unref (layout); } Printing support was added in GTK+ 2.10.