What GUI framework or libs are used in Unreal Engine 4 Feature Demo?
unreal-development-kit, user-interface
Solution
it is not wxwidgets and wpf. it is a new gui framework which is developed by unreal engine 4 team and it named "Slate UI Framework". this framework used for editor and game twice, so it is a cross platform framework and use hardware accerlation, like unity3D editor. if you use some software for example Fraps, it will tell you the full screen is one frame buffer.
Problem
Unreal Engine 4 GUI like this: https://pcper.com/2012/06/e3-12-unreal-engine-4-what-you-and-we-missed-at-gdc/ Unreal Engine 3 use wxwidgets，but in UE4 it looks like .NET Framework WPF. The GUI in UE4 is fantastic. P.S. Microsoft Expression Studio 4 has the same style.