Gtkmm, 4.0 Program terminate Error: Unhandled tag: <cambalache-project>

Applications
, ,
1

Hi, i am a beginner and trying a first Hello world project. Following the gtkmm 4 guide i get a basic app to work.

But when using a Cambalache gui definition file i get the error. Im using Fedora.

terminate called after throwing an instance of ‘Gtk::BuilderError’
what(): 4:1 Unhandled tag: 

#include <gtkmm.h>

class MyWindow : public Gtk::Window
{
public:
    MyWindow();
};

MyWindow::MyWindow()
{
    set_title("Basic application");
}

int main(int argc, char *argv[])
{

    auto app {Gtk::Application::create("org.gtkmm.examples.base")};

    auto builder {Gtk::Builder::create_from_file("/home/ello/misc/CLionProjects/non_template/src/myui.cmb")};

    return app->make_window_and_run<MyWindow>(argc, argv);
}

<?xml version='1.0' encoding='UTF-8' standalone='no'?>
<!DOCTYPE cambalache-project SYSTEM "cambalache-project.dtd">
<cambalache-project version="0.17.3" target_tk="gtk-4.0">
  <ui>
	(1,None,"hello world.ui","hello world.ui",None,None,None,None,None,None,None)
  </ui>
  <object>
	(1,1,"GtkWindow",None,None,None,None,None,-1,None,None)
  </object>
  <object_property>
	(1,1,"GtkWindow","default-height","400",None,None,None,None,None,None,None,None,None),
	(1,1,"GtkWindow","default-width","700",None,None,None,None,None,None,None,None,None)
  </object_property>
</cambalache-project>
2

You cannot use a Cambalache file with Gtk::Builder: they are not the same thing; the cmb file is a Cambalache project file.

You’ll need to tell Cambalache to generates the GtkBuilder XML, and then load that file.

3

yes, works!
I have some opinions on Cambalache…

Is there any alternatives?

4

You mean: are there other UI design tools for GTK4? The answer is, currently, no: there’s only Cambalache.

Many developers don’t use UI design tools, though, and write the UI by hand—either by writing UI templates, which are not supported by gtkmm; or by using Blueprint, which “compiles” to XML at build time.

If you have opinions about Cambalache, feel free to join the cambalache room on Matrix.