qt quick (qml)
TRANSCRIPT
Alexander TrufanovSenior Technical ConsultantForum Nokia
Qt 4.7: Qt Quick
September 18, 2010
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)
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
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
Platforms Windows
Mac OS
Linux / X11
Embedded Linux
Windows CE
Maemo / MeeGo
Symbian (S60)
C++
Java
Python
Ada
Pascal
Perl
PHP
Maintained by
Qt open source community.
Not officially supported by Qt Development Frameworks.
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
1st Ed.
Series 60
2nd Ed.
(+ 3 FPs)
S60
3rd Ed.
S60
3rd Ed.
FP1
S60
3rd Ed.
FP2
S60
5th Ed.
=
Symbian^1
Symbian^3 Symbian^4
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
Simple installation
Qt Creator in nutshell
From the scratch to devices in 5min.
Simulator
On-device-debugging
Remote Compiler
Hybrid ApplicationsHTML App
Qt Web Technology
Qt
Advantages of Hybrid Applications
C++
Full device access
Powerful libraries
HTML, CSS,
JavaScript
Rapid development
Broad reach
http://qt.nokia.com/forms/whitepapers/reg-whitepaper-hybrid
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/
QML• Describe UI by tree structure of property bindings
– Properties dynamically evaluated
– Communication through
signals & slots
– Bindings to C++ code possible
– Animate properties using states
and transitions
Rectangle{
width: 200
height: 200
color: "white"
Image {
source: "pics/logo.png"
anchors.centerIn: parent
}
}
Qt Quick videos & demos