Re: Builder derived widgets with properties -- error validate_and_install_class_property: assertion 'class->set_property != NULL' failed

2022-08-30 Thread Dan Lo Forte 

Kjell,

That worked! Thanks!

Dan

On 8/30/22 08:06, Kjell Ahlstedt wrote:

Den 2022-08-29 kl. 23:37, skrev Dan Lo Forte:


I have a glade file from which I load a derived widget that has a 
Glib::Property.  When I load the main window, I get the following error:


```

GLib-GObject-CRITICAL **: validate_and_install_class_property: 
assertion 'class->set_property != NULL' failed


```

I have created a simplified example, as per this page: 
https://developer-old.gnome.org/gtkmm-tutorial/stable/sec-builder-using-derived-widgets.html.en, 
using a derived Gtk::Button and still see the error.



Your simplified example is very similar to the example at 
https://gitlab.gnome.org/GNOME/gtkmm-documentation/-/tree/gtkmm-3-24/examples/book/builder/derived, 
which does not print an error message. There is a significant 
difference in the glade file (glade_str). You shall change GtkButton 
to gtkmm__CustomObject_DerivedButtonProp, the Gtype name of your 
button class.

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Re: Builder derived widgets with properties -- error validate_and_install_class_property: assertion 'class->set_property != NULL' failed

2022-08-30 Thread Kjell Ahlstedt via gtkmm-list 

Den 2022-08-29 kl. 23:37, skrev Dan Lo Forte:


I have a glade file from which I load a derived widget that has a 
Glib::Property.  When I load the main window, I get the following error:


```

GLib-GObject-CRITICAL **: validate_and_install_class_property: 
assertion 'class->set_property != NULL' failed


```

I have created a simplified example, as per this page: 
https://developer-old.gnome.org/gtkmm-tutorial/stable/sec-builder-using-derived-widgets.html.en, 
using a derived Gtk::Button and still see the error.



Your simplified example is very similar to the example at 
https://gitlab.gnome.org/GNOME/gtkmm-documentation/-/tree/gtkmm-3-24/examples/book/builder/derived, 
which does not print an error message. There is a significant difference 
in the glade file (glade_str). You shall change GtkButton to 
gtkmm__CustomObject_DerivedButtonProp, the Gtype name of your button class.

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