Gtk.PrintContext

Subclasses:None

Methods

Inherited:GObject.Object (37) Structs:GObject.ObjectClass (5)

	create_pango_context ()
	create_pango_layout ()
	get_cairo_context ()
	get_dpi_x ()
	get_dpi_y ()
	get_hard_margins ()
	get_height ()
	get_page_setup ()
	get_pango_fontmap ()
	get_width ()
	set_cairo_context (cr, dpi_x, dpi_y)

Virtual Methods

Inherited:GObject.Object (7)

Properties

None

Signals

Inherited:GObject.Object (1)

Fields

Inherited:GObject.Object (1)

Class Details

class Gtk.PrintContext(**kwargs)

Bases:GObject.Object Abstract:No

A Gtk.PrintContext 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 and Pango.Context objects that match the font metrics of the cairo surface.

Gtk.PrintContext objects gets passed to the Gtk.PrintOperation ::begin-print, Gtk.PrintOperation ::end-print, Gtk.PrintOperation ::request-page-setup and Gtk.PrintOperation ::draw-page signals on the Gtk.PrintOperation.

Using Gtk.PrintContext in a Gtk.PrintOperation ::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);
}

Printing support was added in GTK+ 2.10.

create_pango_context()

Returns:a new Pango context for self Return type:Pango.Context

Creates a new Pango.Context that can be used with the Gtk.PrintContext.

New in version 2.10.

create_pango_layout()

Returns:a new Pango layout for self Return type:Pango.Layout

Creates a new Pango.Layout that is suitable for use with the Gtk.PrintContext.

New in version 2.10.

get_cairo_context()

Returns:the cairo context of self Return type:cairo.Context

Obtains the cairo context that is associated with the Gtk.PrintContext.

New in version 2.10.

get_dpi_x()

Returns:the horizontal resolution of self Return type:float

Obtains the horizontal resolution of the Gtk.PrintContext, in dots per inch.

New in version 2.10.

get_dpi_y()

Returns:the vertical resolution of self Return type:float

Obtains the vertical resolution of the Gtk.PrintContext, in dots per inch.

New in version 2.10.

get_hard_margins()

Returns:True if the hard margins were retrieved

top:top hardware printer margin bottom:bottom hardware printer margin left:left hardware printer margin right:right hardware printer margin

Return type:(bool, top: float, bottom: float, left: float, right: float)

Obtains the hardware printer margins of the Gtk.PrintContext, in units.

New in version 2.20.

get_height()

Returns:the height of self Return type:float

Obtains the height of the Gtk.PrintContext, in pixels.

New in version 2.10.

get_page_setup()

Returns:the page setup of self Return type:Gtk.PageSetup

Obtains the Gtk.PageSetup that determines the page dimensions of the Gtk.PrintContext.

New in version 2.10.

get_pango_fontmap()

Returns:the font map of self Return type:Pango.FontMap

Returns a Pango.FontMap that is suitable for use with the Gtk.PrintContext.

New in version 2.10.

get_width()

Returns:the width of self Return type:float

Obtains the width of the Gtk.PrintContext, in pixels.

New in version 2.10.

set_cairo_context(cr, dpi_x, dpi_y)

Parameters:

• cr (cairo.Context) – the cairo context
• dpi_x (float) – the horizontal resolution to use with cr
• dpi_y (float) – the vertical resolution to use with cr

Sets a new cairo context on a print context.

This function is intended to be used when implementing an internal print preview, it is not needed for printing, since GTK+ itself creates a suitable cairo context in that case.

New in version 2.10.