[Eiwatah4]

> I don't know how other similar languages deal with GUI. It's always sort of hairy, obscure code when you look at it closely.

The best languages for GUIs I've seen are specialized declarative DSLs. Things like QML, XAML, JavaFX FXML, XUL, and even HTML. Anything else very much sucks, in my experience.

[microtonal]

And Qt pre-QML. The user interface is declaratively described in XML (which can be edited visually with Qt Designer). You then use a utility (uic) to generate e.g. C++ class which you can use through composition and inheritance. UI events are wired to code through Qt's signal/slot system.