There's a C++ library for Win32 (and other platforms) GUI programming with built-in layout engine, wxWidgets. It's a bit old, but works quite good, large DPI aw

There's a C++ library for Win32 (and other platforms) GUI programming with built-in layout engine, wxWidgets. It's a bit old, but works quite good, large DPI aware etc. Unlike Qt, it aims to be slim, provides native look and feel for all controls on all platforms, and avoids creating its own leaky abstractions. Necessary workarounds for old versions of Windows are included too. Probably it would be easier to create Go language binding for wxWidgets rather than reimplementing all that stuff from scratch. wxWidgets already has Python, Perl and Ruby bindings, and besides Windows supports Mac (Carbon and Cocoa) and Linux (GTK, X11 and OpenMotif).