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. > >
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