I think the cause is the G_GNUC_CONST annotation on TextView::get_type(). When I step through the code on Fedora 33, in Gtk::wrap_init, all the wrap_registers happen, but the function just returns, skipping the calls to e.g. TextView::get_type()
Ahmet can use g_type_ensure(TVDerived::get_type()) rather than default constructing the class. I think the best fix would be to wrap all the GtkFoo::get_type() calls in Gtk::wrap_init with g_type_ensure. See https://blogs.gnome.org/mcatanzaro/2015/09/14/your-_get_type-function-is-not-g_gnuc_const/ On Sun, Nov 15, 2020 at 11:56 PM ahmet öztürk via gtkmm-list < gtkmm-list@gnome.org> wrote: > Hi Kjell, > > Thank you for the response. I tried your suggestion and the outputs were > exactly as you guessed. So, this seems like a Fedora specific issue. I will > be filing a bug report there. > > Kjell Ahlstedt <kjellahlst...@gmail.com>, 15 Kas 2020 Paz, 15:19 > tarihinde şunu yazdı: > >> On 2020-11-14 14:56, ahmet öztürk via gtkmm-list wrote: >> > Hi all, >> > >> > On Fedora 33, derived widgets does not seem to be constructed properly >> > by Gtk::Builder::get_widget_derived(). The reason I think so is that >> > the overridden methods are not called for these widgets. Apart from >> > that everything seems normal. No error message or anything. >> > >> > I attached a sample code with a very simple case to replicate this >> > problem. on_button_press_event() is never called for the derived widget. >> > >> > I have also noticed that if a dummy instance of the derived widget is >> > created separately (using another constructor) before calling >> > Gkt::Builder::add_from_string(), then the widget created by Builder >> > also works normally. >> > >> > Please note that this may not occur on all distributions. e.g. I know >> > that it does not occur on Arch Linux. >> > >> > Does anybody know if this a Fedora 33 specific issue or is it due to a >> > recent update in Gtkmm that is only affecting Fedora for now? >> > >> The issue does not occur on Ubuntu 20.04 with the latest gtk+3 and >> gtkmm3 from the git repo. >> >> It looks as if the gtkmm__GtkTextView class has not been registered in >> the GType system before get_widget_derived() is called. That should have >> been done by Gtk::wrap_init() which is called from >> Gtk::Application::create(). >> >> You can test if I'm right. Add >> std::cout << "GType name: " << >> G_OBJECT_TYPE_NAME(m_TextView->gobj()) << std::endl; >> after the call to get_widget_derived(). When the overloaded function is >> not called, I suspect that the output will be >> GType name: GtkTextView >> When you've uncommented TVDerived dummy;, and everything is okay, the >> output is probably >> GType name: gtkmm__GtkTextView >> >> If I'm right, it looks like a Fedora specific issue. It can't be due to >> a recent update in gtkmm (I've tested with the very latest one), unless >> there is some Fedora specific update. >> >> _______________________________________________ > gtkmm-list mailing list > gtkmm-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtkmm-list >
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