Glade VCP quits after adding Gramlin plus

If there was a QT version of VCP, would all the existing GladeVCP widgets need to be re-created?

Short answer : Yes!

If we stay with gtk and update to gtk3 they only have to be updated, but we will not have 3D window support. It is possible with a lot of work around and may also be added in the future.

Another toolkit that I use a bit is FLTK, and it is really pretty nice.

Never heard from it, what coding language does that one need?

Norbert

It is written in a simple C++, but I think there are other language bindings as well. www.fltk.org
One thing lacking with FLTK as far as I know is a way to load a GUI from a description file (xml?) at runtime. This could be implemented and I know of at least one project to do that, but I think it is abandoned.

Even with Qt the widgets should probably be written in C++ IMO. They can then be in a library and have bindings and be used in any language.