As we still support C++98, don't use G_VALUE_INIT as the initializer:
it's a braced-init-list, which is only allowed in C++11.
Co-Authored-By: Paul Cornett <paulcor@users.noreply.github.com>
wxGtkValue class was added back in 3f84cb17ca (Add wxActivityIndicator
control., 2015-03-06), but somehow never used. Start using it now
(better late than never...) as it makes the code simpler, shorter and
more robust.
No real changes.
This is a simple animated control indicating some program activity.
Provide native GTK+ (for > 2.20) and OS X implementations as well as a generic
one used under MSW.
Update the sample and the documentation.