1. Qt 4.7: Qt Quick
Alexander Trufanov
Senior Technical Consultant
Forum Nokia
September 18, 2010

2. What is Qt?
• Qt (”cute”) is a cross-platform C++ application development framework
– Set of cross-platform APIs and cross-platform GUI framework
– C++ class library
– Development tools
• Qt was originally designed for efficient creation of platform-independent
desktop GUI programs
• Developed by a Norwegian company called Trolltech, which has been part of
Nokia since 2008
• Latest version is 4.6.3 (under development 4.7 RC)

3. Qt Architecture
• Qt uses native styles to draw UI
– UI elements have original
look & feel
– Can be adapted by the developer
• Built on low level APIs of platform
– No runtime!
• Cross-platform
– Single source for multiple platforms
– Only requires recompilation

4. Qt Licensing
• LGPL license
• Qt is completely free!
– Unlike GPL, the LGPL:
• Allows using Qt for free in commercial, closed source apps
– Complete development source code of Qt available
• Commercial version
– Code changes to Qt source code don’t have to be shared
– Included support options

5. Platforms Windows
Mac OS
Linux / X11
C++ Embedded Linux
Windows CE
Maemo / MeeGo
Java Symbian (S60)
Python
Ada
Pascal Maintained by
Perl Qt open source community.
PHP Not officially supported by Qt Development Frameworks.

7. Symbian and Qt
• Qt for Symbian:
– Compatible to S60 3rd. Edition, FP1+ (for example Nokia N95, E71)
– Install SDK for your device, or lowest denominator for devices you want
to support with your product
• Info about system version of Nokia S60 devices:
http://www.forum.nokia.com/devices/
Series 60 Series 60 S60 S60 S60 S60 Symbian^3 Symbian^4
1st Ed. 2nd Ed. 3rd Ed. 3rd Ed. 3rd
Ed. 5th Ed.
(+ 3 FPs) FP1 FP2 =
Symbian^1

8. Maemo / MeeGo and Qt
• Maemo 5
– GTK+ based UI
– Qt pre-installed
– Final Qt support: H1 2010 (4.6.2)
• MeeGo 1.0 N (formerly: Maemo 6)
– Qt replaces GTK+
– Multi-touch, gestures support
– GTK and Clutter will stay in MeeGo

9.  Simple installation
 Qt Creator in nutshell
 From the scratch to devices in
5min.
 Simulator
 On-device-debugging
 Remote Compiler

10. Hybrid Applications
HTML App
Qt Web
Technology
Qt

11. Advantages of Hybrid Applications
HTML, CSS, C++
JavaScript Full device access
Rapid development Powerful libraries
Broad reach
http://qt.nokia.com/forms/whitepapers/reg-whitepaper-hybrid

12. Qt Quick (Qt User Interface Creation Kit)
• Create UIs as a designer
– Without C++ knowledge
– Using visual tools
– Module: Declarative UI
– Based on QML language
(extension to JavaScript)
– Supported in Qt 4.7
http://blog.qt.nokia.com/2010/02/15/meet-qt-quick/

13. QML
• Describe UI by tree structure of property bindings
– Properties dynamically evaluated
– Communication through
Rectangle{
signals & slots width: 200
height: 200
– Bindings to C++ code possible
color: "white"
– Animate properties using states Image {
source: "pics/logo.png"
and transitions anchors.centerIn: parent
}
}

14. Qt Quick videos & demos