I finally got the Glade program to display the picture I want.
So in the constructor of my widget I add this code (the code is similar to
the custom widget example in gtkmm documentation):
//-----------------------------------------------------------------
GtkWidgetClass *klass;
klass = GTK_WIDGET_CLASS(G_OBJECT_GET_CLASS(gobj()));
klass->draw = pintando_c;
//-----------------------------------------------------------------
the pintando_c function is:
//--------------------------------------------------------------------
extern "C" gboolean pintando_c(GtkWidget *ok, cairo_t * d)
{
Gtk::Widget *p = Glib::wrap(ok);
casilla *k = dynamic_cast<casilla *>(p);
Cairo::Context j(d);
Cairo::RefPtr<Cairo::Context> jj= j.create(j.get_target());
k->on_draw(jj);
}
//-------------------------------------------------------------------
like on_draw function is private, I need to declare pintando_c funtion like
a friend function of my widget class.
I'm so happy... BUT now I have a problem with properties, When I use
Gtk::Builder::getwidget() no property changed in glade file (with glade) is
reflected in the program.
Thanks in advance and sorry for my english
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