I've used wxwidgets in the PC environment for several years. Cross-platform compatibility is great across several systems but the code tends to be very bloated and somewhat slow.
I prefer the FLTK library because the code is much smaller and faster and the API seems easier to understand, at least to me anyway. It's at least as capable as wxwidgets.
The reason why I'm interested in wxWidgets, and not FLTK, or any of the other libs, is that it uses native GUI widgets wherever possible. That way, the app looks like a native app on all systems that it's compiled on.
Hans
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