This tutorial gives an introduction to GUI programming using the Qt toolkit 2.2.1 . It doesn't cover everything: The emphasis is on teaching the programming philosophy of GUI programming, and Qt's features are introduced as needed. Some commonly used features are never used in this tutorial.
Chapter one starts with a ten-line hello-world and each subsequent chapter introduces one or a few more concepts. By chapter 14, the ten lines from chapter one have turned into a 650-line game.
This little game doesn't look much like a modern GUI application. It uses a good few of the GUI techniques, but after you've worked through it, we recommend reading the Simple Application Walkthrough too. That discusses a very simple application with all the common features (menu bars, tool bars, on-line help, printing, a couple of dialogs) in detail.
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Qt version 2.2.1