Re: Setting custom Glib::Property values in Gtk::Builder .ui XML

[Kjell Ahlstedt <kjellahlstedt gmail com>]

On 6/10/19 10:39 AM, Daniel Boles via gtkmm-list wrote:
> A related question here is: How can we ensure the derived type is 
> registered with GObject before GtkBuilder would need it? Will a simple 
> g_type_ensure( g_type_from_name("gtkmm__Custom_Whatever") ) work? I 
> imagine not, as the GObject class won't exist until C++ constructs the 
> first instance, right? Then it would seem we must instead create a 
> dummy C++ instance (and ensure it isn't optimised out) before trying 
> anything that would require GObject to know about it...
I think you're right. The only way to have a custom widget's type 
registered in the GType system is to create an instance. All the 
ordinary gtkmm types are registered with calls to the static get_type() 
methods. That's done in wrap_init(). But there is no corresponding 
method to call for custom types.