struct Gtk::PrintOperation::DrawPageSignal

• Gtk::PrintOperation::DrawPageSignal
• GObject::Signal
• Struct
• Value
• Object

Overview

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::PrintContext#cairo_::context.

WARNING ⚠️ The following code is in c ⚠️

static void
draw_page (Gtk::PrintOperation *operation,
           Gtk::PrintContext   *context,
           int                page_nr,
           gpointer           user_data)
{
  cairo_::t *cr;
  Pango::Layout *layout;
  double width, text_height;
  int layout_height;
  Pango::FontDescription *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::PrintOperation#use_full_page= and Gtk::PrintOperation#unit= before starting the print operation to set up the transformation of the cairo context according to your needs.

Defined in:

lib/gi-crystal/src/auto/gtk-4.0/print_operation.cr

Instance Method Summary

• #connect(*, after : Bool = false, &block : Proc(Gtk::PrintContext, Int32, Nil)) : GObject::SignalConnection
• #connect(handler : Proc(Gtk::PrintContext, Int32, Nil), *, after : Bool = false) : GObject::SignalConnection
• #connect(handler : Proc(Gtk::PrintOperation, Gtk::PrintContext, Int32, Nil), *, after : Bool = false) : GObject::SignalConnection
• #emit(context : Gtk::PrintContext, page_nr : Int32) : Nil
• #name : String

  The signal name

Instance Method Detail