Re: Cannot `dynamic_cast` custom wrapped widget from Gtk::Builder

Daniel Boles via gtkmm-list <[email protected]> Fri, 1 May 2020 23:44:40 +0100

Newsgroups	gmane.comp.gnome.gtkmm
Message-ID	<CAKChMKN7dTRr4QxaGYzb2TAzAKsZ_9zpmVGQ7_gH+Zfpv8fY8w@mail.gmail.com>

On Fri, 1 May 2020, 23:40 Josh Bialkowski, <[email protected]>
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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