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?
#include <iostream>
#include <gtkmm.h>
class TVDerived : public Gtk::TextView
{
public:
TVDerived() {}
TVDerived( BaseObjectType* obj, const Glib::RefPtr< Gtk::Builder >& )
: Gtk::TextView( obj ) {}
~TVDerived() {}
protected:
bool on_button_press_event( GdkEventButton* event ) override
{
std::cout << "on button press event" << std::endl;
return Gtk::TextView::on_button_press_event( event );
}
};
class ExampleWindow : public Gtk::Window
{
public:
ExampleWindow()
{
set_title( "get_widget_derived() Issue" );
set_default_size( 400, 200 );
const Glib::ustring ui_def =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
<interface>\
<object class=\"GtkTextView\" id=\"tvd\">\
<property name=\"visible\">True</property>\
<property name=\"can-focus\">True</property>\
<property name=\"monospace\">True</property>\
</object>\
</interface>";
//TVDerived dummy; // solves the problem when uncommented
auto refBuilder = Gtk::Builder::create();
try
{
refBuilder->add_from_string( ui_def );
}
catch( ... )
{
std::cout << "Glade Error! " << std::endl;
return;
}
refBuilder->get_widget_derived( "tvd", m_TextView );
add( *m_TextView );
show_all_children();
}
virtual ~ExampleWindow() {}
protected:
TVDerived* m_TextView;
};
int main( int argc, char *argv[] )
{
auto app = Gtk::Application::create( argc, argv, "org.gtkmm.example" );
ExampleWindow window;
return app->run(window);
}
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