Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 123]

▼Ngui	GUI library's name space
CButton	Button widget. That rectangular thing with inscription on it
CEditBox	EditBox widget. You can type into it
CEvent	Class for objects representing events. Its creation and copying is managed by GUISystem class
▼CEventEmitter	Base class for things that emits events
CMapPredicate
CEventListener	Wrapper for std::function; used by EventEmitter to append IDs to listening functions
CEventObject	Intended to contain bowels of different types of events
▼CEventQueue	GUISystem's internal event queue; collects fired events and affiliates them with particular event listener
CEntry	EventQueue's inner class that contains an Event object and event listener it's destined
CGUISystem	Manages creating widgets and events and provides routines governing GUI mechanisms
CHandle	Template class for widget handles
CKeyboardEvent
CLogger
CMouseEvent
CRenderer	Class that provides rendering functions for widgets
CScrollbar	Scrollbar widget. Has a bar and it scrolls!
CTextField	TextField widget. It's like EditBox but no editing
CWidget	Base class for widgets. Inherits EventEmitter
CApp	Application's main class
CCustomWidget	Test class for adding own widgets mechanism