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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