Re: Template Widgets inside another GtkBuilder file

[Emmanuele Bassi <ebassi gmail com>]

Hi;

On 3 October 2015 at 02:14, Victor Aurélio Santos
<victoraur santos gmail com> wrote:
> How can I do that ?
> Just build all together results in this warning:
>
> > (ajami:3475): Gtk-CRITICAL **: Error building template class 'AjamiMainWindow' for an instance of type 
> > 'AjamiMainWindow': Invalid object type 'HVMeter' on line 2
>
> I've asked on SO[1] and got only one answer.
>
> I stick at "_get_type" workaround/hack but I didn't like it and I
> can't do the same thing in Vala (I've not found how to do the same
> thing).
>
> More details can be found on SO question.
>
> So, what I really want to know is what is the best option to
> accomplish this in Vala and in C too.
>
> [1]: http://stackoverflow.com/questions/24235937/custom-gtk-widget-with-template-ui

If you have an internal, private widget that you use as a child in a
template, you'll need to ensure that the type system knows about the
child widget's type before initializing the template that references
it.

In order to do that, you should use `g_type_ensure()` inside the
instance initialization function of the parent's widget class, right
before calling `gtk_widget_init_template()`; for instance:

  g_type_ensure (hv_meter_get_type ());

This is also what GTK+ itself does:
https://git.gnome.org/browse/gtk+/tree/gtk/gtkfilechooserwidget.c#n8598

Ciao,
 Emmanuele.

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