This document introduces Qt, an open source cross-platform application framework for building graphical user interfaces. Key points: Qt was originally developed by Trolltech and is now maintained by Digia; it allows developers to write GUI apps in C++ that run on multiple platforms; Qt provides widgets, graphics, multimedia and other APIs and is used in many applications including Skype, VirtualBox and the KDE desktop environment. The document discusses Qt's history and licensing, installation, technical features like signals and slots, and examples of Qt in use.

1. Intro to Qt
GUI programming with C++
by Đức Phạm
Organized by
Qt is a registered product of Digia

2. Đức Phạm
 Email: inducpham@gmail.com
 Bachelor of IT since 2009
 Linux enthusiast
 Worked in Gameloft and now is East Agile
 Interest in Game and Web development

3. History
 Developed by Trolltech
 Acquired by Nokia
 Commercial license took over by Digia

4. In a nutshell
 Qt is ‘cute’
 Cross-platform GUI library for the C++
programming language
 A complete interface environment with support
for Webkit API, media streamer, file system
browser, OpenGL API, etc.

5. VLC 2.x running in
Windows, OS X 10.7
and Debian Linux

6. In a nutshell (continue)
 Support embedded Linux
 Smart phones: Maemo, Meego, etc.
 Electronic devices: Car, TV, etc.
 Feature road map including support for
popular mobile platforms such as
Android and iOS.

7. Legal stuff
 Qt offers three licenses:
 GPL v3
 lGPL
 Digia commercial license

8. Installation
 Official download: http://qt-project.org/downloads
 Official IDE: QtCreator
 Visual Studio add-in
 Debian repository:
 sudo apt-get install qtcreator qtcreator-dbg

9. Technical features
 Customized precompiler: signal and slot

10. Technical features (continue)
 Signals don’t need to be implemented, but
rather called
 Signals and slots can be connected:
 Regardless of which object
 Many-many relationship
 Could be disconnected

11. Technical features (continue)
Features the parent-child relationship
 A child widget when created could reference to
a parent widget. This allows:
 Hierarchy search: findChild() and
findChildren()
 Chain destructor on parent de-allocating

12. Tech demo

13. Qt in the world
 Industrial
 Skype
 VirtualBox
 Maya
 Opera
 Various embedded software

14. Qt in the world (continue)
KDE
 Complete desktop environment in Qt
 Including the Plasma Window manager
 Projects including Office Applications
 Development suite: Kdevelop
 Common desktop applications

15. Qt in the world (continue)
Open source projects
 Qt razor
http://qt-apps.org/

16. Further references
 http://qt-project.org/doc/qt-4.8/
 http://www.youtube.com/user/VoidRealms
 http://www.kde.org/developerplatform/
 http://qt-apps.org/

17. Questions?

18. Thank you!