Class

Gtk.PrintContext

Description [src]

final class Gtk.PrintContext : GObject.Object {
  /* No available fields */
}

A GtkPrintContext encapsulates context information that is required when drawing pages for printing.

This includes the cairo context and important parameters like page size and resolution. It also lets you easily create PangoLayout and PangoContext objects that match the font metrics of the cairo surface.

GtkPrintContext objects get passed to the GtkPrintOperation::begin-print, GtkPrintOperation::end-print, GtkPrintOperation::request-page-setup and GtkPrintOperation::draw-page signals on the GtkPrintOperation object.

Using GtkPrintContext in a ::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_pango_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);
}

Hierarchy

hierarchy this GtkPrintContext ancestor_0 GObject ancestor_0--this

Ancestors

  • GObject

Instance methods

gtk_print_context_create_pango_context

Creates a new PangoContext that can be used with the GtkPrintContext.

gtk_print_context_create_pango_layout

Creates a new PangoLayout that is suitable for use with the GtkPrintContext.

gtk_print_context_get_cairo_context

Obtains the cairo context that is associated with the GtkPrintContext.

gtk_print_context_get_dpi_x

Obtains the horizontal resolution of the GtkPrintContext, in dots per inch.

gtk_print_context_get_dpi_y

Obtains the vertical resolution of the GtkPrintContext, in dots per inch.

gtk_print_context_get_hard_margins

Obtains the hardware printer margins of the GtkPrintContext, in units.

gtk_print_context_get_height

Obtains the height of the GtkPrintContext, in pixels.

gtk_print_context_get_page_setup

Obtains the GtkPageSetup that determines the page dimensions of the GtkPrintContext.

gtk_print_context_get_pango_fontmap

Returns a PangoFontMap that is suitable for use with the GtkPrintContext.

gtk_print_context_get_width

Obtains the width of the GtkPrintContext, in pixels.

gtk_print_context_set_cairo_context

Sets a new cairo context on a print context.