GTK+ is an open-source library that allows to quickly and easily build a graphical user interface, using standard widgets like buttons, combo boxes, text and tree views, scroll bars, etc. Even though GTK+ is written in C, it can be used from an Ada application thanks to GtkAda, an object-oriented Ada/C binding.

Illustrated by a poker game application, this presentation will explain the essential concepts of GtkAda. It will show how to create the most common widgets and how to interact with the user.