What GUI library does Godot Engine use for the editor?

[silly boy]

I have browsed the source code and the docs and I wasn't able to figure out how the GUI is being built. Anyone has a way to know where it is? thanks!

[Akien]

Godot's editor is built with Godot's own Control nodes which you can use for your games. In short, there's no external toolkit, Godot's editor is a Godot game.

The Controls/GUI code is here: https://github.com/godotengine/godot/tree/master/scene/gui

[Hazy McPhantasy (aik)]

How can one "translate" the c++ code you linked into a Godot project? You said Godot-UI is itself a Godot game - but the linked files are all c++ - no scenes, no godot-script files. Could I e.g. take the 2d-editor-pane from the Godot sources and use it in my own apps?