One quick follow-up. I re-read [this page][1] about initialization and
realized that I didn't generate or call a `wrap_init` function using `
generate_wrap_init.pl`. So I added that step and am now calling it in
`main()` before any using code. This means that I was previously not
calling the following:
~~~
Glib::wrap_register(gtk_panzoom_area_get_type(),
&PanZoomArea_Class::wrap_new);
~~~
Unfortunately even after generating the `wrap_init` and calling it in my
`main()` I continue to get the same error and cannot load the widget with
`Gtk::Builder`. Also, since I forgot to mention this before, I'm using
gtkmm version 3.22.2 and glibmm 2.56.0 (as distributed with Ubuntu 18.04).
[1]:
https://developer.gnome.org/gtkmm-tutorial/stable/sec-wrapping-initialization.html.en
On Fri, May 1, 2020 at 3:48 PM Josh Bialkowski <josh.bialkow...@gmail.com>
wrote:
> Ok, thanks for trying to help! I'll take a look at the generated code for
> something in gtkmm and see if it's any different with regard to ObjectBase
> initialization.
>
> On Fri, May 1, 2020 at 3:44 PM Daniel Boles via gtkmm-list <
> gtkmm-list@gnome.org> wrote:
>
>>
>>
>> On Fri, 1 May 2020, 23:40 Josh Bialkowski, <josh.bialkow...@gmail.com>
>> wrote:
>>
>>> It looks like it does, I'm pretty sure this happens in the
>>> `panzoomarea_class_.init()` call:
>>> ~~~
>>> PanZoomArea::PanZoomArea()
>>> : // Mark this class as non-derived to allow C++ vfuncs to be
>>> skipped.
>>> Glib::ObjectBase(nullptr),
>>> Gtk::DrawingArea(Glib::ConstructParams(panzoomarea_class_.init()))
>>> {}
>>>
>>
>>
>> iirc for Builder to work with derived widgets, ObjectBase() needs called
>> with a type name or id. but not sure it explains dynamic_cast failing, so
>> i'll defer to someone more experienced now!
>>
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>>
>
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