Cutest technology of them all - Forum Nokia Qt Webinar December 2009

Qt.
Cross platform.
But still easy.
It will be w
e b a nd Q t
p ek k a .k o s for Nokia.
onen@no
ki a.com

Slides will be available in http://www.slideshare.net/pkosonen

Qt and Web is the way to go
Web
Web Runtime developers

For native
Qt UI Extensions
Developers
UI 85% of use
cases **
Qt
Engine

Mobile
Qt Mobility APIs
Features

Low level Native Native Native 15% of use
Native access
APIs APIs APIs cases **

Desktop
Symbian Linux
OSs
S60 on Symbian maemo
Platform Platform

** Not based in any realiable statistics ;)

Why Qt?
What is Qt about?
• QuickTime player? Programming language? A platform? Yet another runtime?
• A new Japanese car model?

Qt is Cross‐platform application framework
• Differentiated user experience across hardware platforms
• Hybrid development: convergence of web and native applications
• Cross‐platform software across desktops and mobile devices. Qt supports major
desktop OSs already and will extend it’s reach to Nokia platforms.
• Qt is not a runtime – no perf issues or sandbox restrictions. You can stand out with
your native development skills to fulfill the use cases offered by Qt.
• Qt Mobility APIs will bring in the easy to use APIs for mobile use cases.

Shorter time to market
• Productive APIs and comprehensive documentation with great examples
• Delivering functionality faster and maximizing efficiency by placing focus on
innovation
• All the great tools offered free of charge ‐ commercial services available as well

3

What is Qt?

Qt is set of C++ libraries …

4

What is Qt?

… which allows you to design applications …

#include <QtGui>

int main(int argc, char *argv[])
{
QApplication application(argc, argv);
QPushButton hello("Hello world!");
hello.show();
return application.exec();
}

5

What is Qt?
... that comes with a UI designer: Qt Designer …

6

What is Qt?
...and an IDE: Qt Creator …

7

What is Qt?

...that works on all these platforms:

Example: Google Earth on Mac, Windows and Linux

8

Simplified development - PC, Mac, Linux
The new offering is the only native mobile dev environment to work on Mac,
Windows and Linux. Develop your way.

The offering will be based on Qt, the
development tool used to create
applications such as Skype, Adobe
Photoshop Elements and Google
Earth.

The tools will allow developers to use
Windows, Mac OS X and Linux for
their mobile development work.

Who uses Qt?

From embedded devices to
From embedded devices to By companies from
By companies from
desktop applications
desktop applications many industries
many industries

10

Why use Qt?

*
* Original image from: http://diddo‐chan.deviantart.com/

11

Introducing Qt 4.6 and Beyond

User experience Qt Everywhere
•New animation framework •Qt ported to Symbian S60, Windows 7, Mac OS X
•Declarative expression of user interfaces 10.6, Maemo 5, Real‐time OS (QNX, VxWorks)
•Qt applications can be deployed on millions of
•Gestures & multitouch support
devices

Performance In research
•OpenVG graphics engine •XML Schema Validation
•Optimizations to resource use •Icon theming ability
•Architecture‐specific improvements to ARM devices •Further embedded and smartphone improvements

12

New in Qt 4.6: Graphic Effects

• Apply graphical effects to graphics items or widgets
• Add highlight or accentuation to create visually
appealing user interfaces
• Key features:
– Apply effects to any paint device
– Enables effects on both
QGraphicsItem and QWidget
– Extend with your own effects
– Common effects built in …
Colorize, Blur, DropShadow,
Opacity

13 13

New in Qt 4.6: States and Transitions

• A robust state chart implementation based on
Harel state-charts and SCXML
• Key benefits:
– Simplify application semantics
– Use states to improve maintainability
– Write verifiable application logic
– Makes event-driven programming
robust and reusable

14 14

New in Qt 4.6: Animation API

• Allow users to create dynamic UIs
• Integrates with States and Transitions
• Key features:
– Animate any QObject property
– Combine animations in groups
– Use easing curves
– Synchronized timer for better
CPU utilization

15

New in Qt 4.6: Gestures

• Combine sequential touch inputs to a ‘gesture’
• Key benefits
– Allow users to interact with applications in better ways
– Simplify finger-based interaction with UI components
– Allowing common basic gestures
…as well as multi-touch gestures
– Enable extensibility

16 16

New in Qt 4.6: Qt3D enablers
• As more of Qt and applications built on Qt go 3D, API’s are provided
to simplify this
• Key benefits:
– Simplifies creating 3D applications with OpenGL
– API for vertex and fragment Shaders, GLSL/ES
– Math primitives for matrix multiplication,
vectors, quaternions (client-side)
• Future research on
Stencils, vertex buffers and arrays,
texture manipulation, geometry shaders

17

Hybrid Development with Qt 4.6
• Qt includes a rich selection of features for web and hybrid
development
– QtWebKit module: embed web content from servers, local files
or application’s resources into Qt applications, implement user
interfaces in web technologies.
– QtWebKit has a rich API to interact with the web content from
C++, e.g. QWebElement can be used with the DOM
– QtScript module: make Qt applications scriptable
– QtXmlPatterns module: shape and mash up XML data yielding
HTML output
– QNetworkAccessManager: interact with server URL APIs

18

Weather Info

___ lines of Qt/C++ code?

19

Weather Info

411 lines of Qt/C++ code

20

Ray Casting


21

Ray Casting


22

Google Chat Client


23

Google Chat Client


24

Start today : you can soon get your
Qt app running on more than
+ 130 000 000 smartphones!

in addition
to all majo
r desktop
OSs

Qt Mobility Project – new Qt APIs
•Technology preview - package of new Qt
APIs
•The full release of these APIs is
scheduled for 1st half of 2010

•Standard mobile functionality for
applications
•Evolving all the time!

•Download Tech Preview 2:
•http://qt.nokia.com/developer/new-
qt-apis

http://qt.nokia.com/developer/new-qt-apis

Be the “Qtst” – Forum Nokia Code
Competition
Grand Prize Winner will receive a
trip to the upcoming Nokia 2010
Developer Summit to be held in
San Francisco, USA during June 9th
and 10th!
Top winners will also be selected to receive
nominations as Forum Nokia Champion
program as well as getting the coolest Nokia
devices free of charge!

For details go to http://wiki.forum.nokia.com/index.php/Qt_Mobility_Contest
Entries to the contest will be open from Dec 7th, 2009 until January 31, 2010.
Register by latest 30th of December 2009!
THANK YOU!

Pop the hood.
Details of Qt.
Instead of
just power
point mar
s hm allow…

What’s in SDK?
Qt SDK
Qt Development Tools

Licensing Options:
Commercial
Qt Libraries Qt Designer Qt Assistant LGPL
GUI Layout & Help file/documentation browser
Forms Tool

Qt Linguist qmake
Translation/I18n Tool Cross‐platform build tool

29

Qt Creator: Cross Platform IDE
• Lightweight cross-platform IDE for Qt
–An advanced C++ code editor
–Integrated, context sensitive help system
–Integrated visual debugger (based on gdb)
–Integrated source code management
–Project and build management tools
–Qt developer tools integrated

• Benefits
–New developers get up and running faster
–Boosts developer productivity
–Tailored to the needs of Qt developers

Building Qt Applications – qmake!

• Tool to simplify the build process across different platforms
• Automates the generation of Makefiles
• Generates Makefile based on the information in a project file
• MOC and UIC invoke

qmake Project Platform Application
qmake specific make
-project information Binary
file (.pro/.pri) Makefiles

Qt Modules
Qt provides native look-and-feel in all
platforms
Cross-platform Qt consists of 12 modules
• A little bit less than 700 API classes,
all modules depend on QtCore
Enables pure Qt applications, but
• Possibility to use platform APIs
• Possibility to embed native
elements, including UI widgets
Development Tools included like Qt
Creator, Qt Designer, Qt Assistant, Qt
Linguist

Qt GUI Classes
• Extends QtCore with GUI functionality QtOpenGl QtSvg QtWebKit QtXmlPatterns Qt3Support

• UI application base class
• UI components : set of widgets and dialogs QtGui QtSql QtXml QtNetwork QtScript Phonon

• Widget layout management and classes for UI Events

• All the UI components usually needed QtCore

• Not enough?
• Customized components can be done and integrated
with Qt Creator

• Provides rich set of GUI components
and supporting functionality
• Model-View-Controller (MVC) Item views
• Styles – ensuring native or custom look
and feel on target platforms
• Font-aware layout system
• Accessibility classes
• Canvas component with Widget support

Qt – Modules (Network)
•Classes for writing TCP/IP clients and servers QtOpenGl QtSvg QtWebKit QtXmlPatterns Qt3Support

• Makes network programming
easier and portable QtGui QtSql QtXml QtNetwork QtScript Phonon

•Support for QtCore

• Lower level protocols (TCP and UDP)
and higher level application protocols (FTP and HTTP)
• Seamless integration with progress widgets and any IO device
• Host Name resolving services and URL parsing, SSL support and much more
QHttp http;
connect(http, SIGNAL(done(bool)), this, SLOT(done(bool)));
http->get( “http://overtheair.org/amazingApi.jsp?action=doGreatThings”);

void MyClass::done(bool error)
{ QString data = http->readAll(); //handle data }

Qt – Modules (Sql)
QtOpenGl QtSvg QtWebKit QtXmlPatterns Qt3Support

• Provides database integration to Qt applications
• Divided to three layers
QtGui QtSql QtXml QtNetwork QtScript Phonon

1. UI Layer
• Provides classes to link the data from database to
data-aware widgets QtCore

• Designed to work with Qt's model/view framework

2. API layer
• Provides Qt’s abstracted database-independent SQL
API

3. Driver layer
• Provides low-level bridge between the specific
databases and the SQL API layer QSqlDatabase db =

• Uses driver plugins to communicate with the QSqlDatabase::database("sales");

different databases QSqlQuery query

• Several drivers are supplied with Qt ("SELECT Lastname,
City FROM Names", db);

Qt – Modules (XML)

•QtXml
• Provides C++ implementation of SAX and DOM style
XML parsers QtGui QtSql QtXml QtNetwork QtScript Phonon

• Provides a stream reader and writer for XML
documents QtCore

• XSLT support

•QtXmlPatterns
• XQuery support for Qt QXmlStreamReader xml;
• Simple SQL-like query language for traversing XML xml.addData( data );
documents while (!xml.atEnd())
• Can select and aggregate XML elements of interest {
and transform them for output as xml.readNext(); ...
XML or in some other format
// do processing
}

Qt – Modules (WebKit)

• Classes for displaying and editing Web content

• Web content can be enhanced with native
QtGui QtSql QtXml QtNetwork QtScript Phonon

controls
QtCore

• Based on open-source WebKit engine
• Ported to use Qt
• Rendering
• Text Handling
• Network Access
• Integrated part of WebKit project, uses
WebKit’s platform abstraction

• Qt Style API to engine:
• QWebView, QWebPage and QWebFrame QWebView *view = new QWebView(parent);
view->load(QUrl("http://qt.nokia.com/"));
view->show();

Qt supports future native development on Symbian

1H09 2H09 2010 2011 
• Technology Preview • Symbian OS, S60 3.1, • Planned for • Planned for
Garden for Nokia 3.2 and 5.0 Symbian^3 Symbian^4 and
Symbian device (S60 future releases
3.1+)

• Part of Qt 4.5 • Qt for Symbian, • Qt as part of • Qt and new UI
functionality on installed together Symbian platform framework in
Symbian with Qt applications Symbian

• Native Symbian as • Qt available for • Significance of Qt as • Qt as primary native
primary developer commercial developer offering developer offering
offering development grows

*Qt for early preview, to invite feedback

Qt for Symbian – current status (Dec -09)
•Qt 4.6.0 supports Symbian. It’s ~ feature complete but we’re
not stopping here. December and January will be solely spent
on optimization.

•Qt 4.6.1 will be ready early 2010. That will be the version to
release your Qt applications against!

•At the same time we’ll have a tool called smart installer
ready. The tool solves the problem of distributing Qt and
dependencies to devices on the market (3.1, 3.2, 5.0)

Smart Installer

The opportunity The problem The solution
A Smart Installer tool that
+130M Symbian devices Qt libraries need to be
checks whether needed Qt
could run cross-platform Qt post installed – most
version is available on the
applications already during consumers might not
device – and if not, it will
this year bother
handle the installation

Details
•Nokia is working on a tool called Smart Installer for Symbian devices
•The expected availability is 1Q 2010
•A piece of code is to be packaged together with the Qt application targeted for Symbian devices (when
creating the .sis file)
•The Smart Installer will download OTA the needed Qt version to the handset if it is not already present

The facts
•Qt applications on Symbian are Symbian applications
• Platform security and signing rules apply

•Symbian UI based on Avkon will disappear soon – All Symbian
applications will be rewritten using Qt!

•Qt is supported in S60 3rd Edition FP1 onwards
• Will be preinstalled in in Symbian^3 based devices in 2010 *

•Distribute your Qt for Symbian applications with Qt 4.6.1 and smart
installer (both available early 2010)

* according to Symbian Foundation announcements

Developer resources
• http://wiki.forum.nokia.com/index.php/Qt_Mobility_Contest
• For general questions there is a public 'discussion board
http://discussion.forum.nokia.com/forum/forumdisplay.php?f=231 monitored by Forum Nokia experts.
• Qt main page http://qt.nokia.com/
• Qt Mobility project http://qt.nokia.com/developer/new-qt-apis
• Symbian SDKs http://www.forum.nokia.com/Tools_Docs_and_Code/Tools/Platforms/S60_Platform_SDKs/
• Qt for Symbian http://qt.nokia.com/products/platform/symbian
• Qt main page in Forum Nokia http://www.forum.nokia.com/Qt
• http://qt.nokia.com/products/whats-new-in-qt Qt 4.6
• Qt for Maemo preview http://qt.nokia.com/developer/qt-for-maemo-developers
• Forum Nokia Library http://library.forum.nokia.com/
• Qt 4.6 online documentation http://doc.qt.nokia.com/4.6/
• Symbian and Qt examples mapping to Qt Mobility APIs
• http://wiki.forum.nokia.com/index.php/Qt_Mobility_API_Mapping

• Qt 4.6 mobile demos on Maemo and Symbian http://www.youtube.com/watch?v=PCx8RfNhhXk

• Ancestor of Mobility Project http://wiki.forum.nokia.com/index.php/Mobile_Extensions

Maemo - Why should I care?
• Coming from desktop?
• The importance of mobile clients is widely recognized already – not gonna sell it here…
• With Qt and Mobility APIs you can easily extend your application to cover smartphone
features and utilize f.ex location, contacts, messaging etc.
• With maemo and Symbian you can reach more than 100 million devices with your Qt
application – already with Qt 4.6!
• Maemo is and will be very important for Nokia
– get a head start to maemo which we believe will be one of the most interesting
platforms!
• With Ovi store you have a ready channel to sell your application to hundreds of millions of
users

From geek(ish) gizmos to mainstream
devices
• Maemo is an open-source development platform for Internet Tablets and maemo mobile
computers (f.ex N900)
• 90% of source code is open-source
• Maemo 5 contains GSM and 3G functionality (i.e standard smartphone)

• In maemo 5 GTK is still supported as development framework – not officially supported in
maemo 6 anymore

• We’re bringing in Qt for maemo and encourage all developers to use Qt as the long term
solution
• http://qt.nokia.com/developer/qt-for-maemo-developers

Maemo 5
• Linux based operating system for N900
• Optimized for pocket sized devices
and finger use
• Panorama desktop N900

• Multitasking with dashboard TI OMAP 3 processor, ARM Cortex-A8 600 MHz

• New UI style HSPA/3G support – online anywhere 3G
connectivity
• Animated UI High definition camera support (integrated Image
• Compositing window manager Signal Processor) 5 megapixel camera (2584 ×
1938 pixels)
• Accelerated graphics with OpenGL-ES2 HW acceleration for OpenGL ES 2.0
3.5 inch touch-screen 800 × 480 pixel resolution

High-speed USB 2.0

Integrated GPS with A-GPS

WLAN IEEE 802.11b/g
32 GB internal storage

http://www.forum.nokia.com/devices/N900

Hildon UI – simple and customizable
Status bar
indicating
device state

Consistent
controls
across
applications
Taskbar to
navigate
applications

Widgets and RSS feeds for
up-to-date information

Qt for maemo
• Maemo is and will be very important platform for Nokia

• Qt 4.6 will be officially supported on maemo 5
• Maemo 6 is built on Qt

• With Qt and mobility APIs you can make true mobile
applications that work accross different platforms

• Develop now!
• How to get information when official releases are
coming
• Distribute when Qt 4.6 for maemo is ready - Q1 2010!

http://qt.nokia.com/maemo


Developer Resources
•http://qt.nokia.com/developer/qt-for-maemo-developers
• http://wiki.maemo.org/Qt4_Hildon#Using_the_Qt_4.6_tech_preview
_in_Fremantle

•http://wiki.maemo.org/

•Maemo 5 documentation http://wiki.maemo.org/Documentation

•Qt for Maemo developers guide : beta
http://wiki.forum.nokia.com/index.php/Qt_for_Maemo_Developers_Guid
e

•Targeting to get Qt Creator support for Maemo development!

!

2010: Qt Mobility Project
What is it?
– New Qt APIs enabling cross-platform mobile application development and service
access

What is the value?
– Easier to create applications targeting many platforms
– Reuse of code between the mobile platforms
– Bring existing Qt developers as well as new ideas
– Bring Symbian and Nokia developers to new platforms

Supported Platforms
- Symbian 3rd Ed FP1, Symbian 3rd Ed FP2, Symbian 5th Edition, Maemo, Windows CE,
Windows XP/Vista, Linux, Mac OS X

http://qt.nokia.com/developer/new-qt-apis 53

• Service Framework
Launch, discover, and communicate with services
Use services natively or through Javascript etc
Control access to services

• Context Framework
Share context information between applications

• Contacts API
Access stored contacts or create new contacts

• Location API
Query current location
API hides underlying Location source (GPS, Cell ID, etc)


!

• System Information API
Access to platform and/or device information
Determine status of available resources
• Bearer Management
Manage available network connections
Use the best available connection
• Messaging API
Send and receive a variety of message types
• Multi-Media API
Play and record audio/video


Mobility APIs per platform

Maemo 5 support will be implemented as well!


More to come
•There are still many enabler missing from Mobility
• Sensors, Calendar, Telephony, …
•Good things :
• We’re bringing those in as well!
• Even without these APIs you can access all the features of the
device from Qt applications – as Qt applications are native you can
use the OS specific APIs seamlessly within your Qt application

•Stay tuned : http://qt.nokia.com/developer/new-qt-apis
•Provide your input for us :
• http://discussion.forum.nokia.com/forum/forumdisplay.php?f=232
•Remember the contest :
http://wiki.forum.nokia.com/index.php/Qt_Mobility_Contest


Taking Mobility APIs into usage on Symbian
•Prerequisites : Qt for Symbian 4.6.0 installed on your development
environment and device
•Download and extract the Mobility package
symbian
•Copy the zip file to your Symbian SDK install.txt
install_to_SDK
• next to epoc32 folder
Qt_Mobility_tech_preview_libraries.zip
•Configure the examples install_to_device
Qt_Mobility_tech_preview.sis
• configure.bat -examples
•Build the examples and install to your device
• cd examples
• qmake [example].pro
• make release-gcce
• createpackage -i [example]_template.pkg release-gcce


Our vision: Web into any application
Now Web browser Web Runtime widget Now

Open source
WebKit is the
foundation and
common
engine

Widget +
Now platform services Native application Next

Interact with Web Services
• QtWebKit allows
• Intuitive use of network resources
• Exposing QWidget to HTML and QObject to JavaScript
• Calling JavaScript from Qt and vice versa

JS

Qt

OS specific
APIs

• Based on the Open Source WebKit engine

QWebView and QWebPage classes
QWebView inherited from QWidget
• Renders the content in QWebPage
QWebView
• Easy to embed wherever widget could be used
QWebPage provides access to the document QWebPage
structure in a page
• Frames QWebFrame
• Navigation history
• Undo/redo stack for editable content
Each QWebpage has one QWebFrame object as its
main frame
HTML documents can be nested using frames
QWebView *view = new QWebView( parent );
view->load(QUrl(“http://www.nokia.com”));
view->show();

Hybrid - combining the best of both worlds
So you can run JS and HTML inside Qt application…
What are the differences compared to a WRT widget?

WRT Widget running on top of Qt application
webkit
Webkit QWebView running webkit
Widgets HTML, CSS, Same HTML, CSS,
JavaScript JavaScript

Platform
Services

Native APIs Native APIs incl. Qt Mobility APIs
Platform
Services “Platform
implementation Services”
implementation

Key selling points in the hybrid approach
• No feature restrictions!
• Asset is protected – widgets are essentially open source
• Works where ever Qt is available (symbian, maemo, windows, linux, mac, …), huge
install base
• Utilize web developer skills to make native applications
• Qt native skills to implement”platform services”
• Qt script generator http://labs.trolltech.com/page/Projects/QtScript/Generator
• Mixing native and HTML UI
• Interesting scenarious coming f.ex with Orbit widgets
• Tools might be problematic (migrating web tools and native (Qt Creator))
• We can make hybrid approach even for compelling by providing ready framework
where existing widgets can be plugged in

• We are working on a framework to make this as easy as possible for web developers

2010: Qt Kinetic Project
• Allow developers and designers to create flexible and
visually appealing user interfaces using intuitive code or
GUI designer
• Key benefits
– Declarative UI programming
– Encourages developer-designer collaboration
– Faster time-to-market with rapid prototyping
– Expressive language (QML)
– Exposes Qt objects and properties
via JavaScript
– Transitions and manipulations

67 67

2010: Declarative UI Designer
• Utilizing declarative UI technology
• For programmers and designers, visual and code
• Target mobile/embedded and desktop platforms
• Create state-of-the-art, visually appealing
user interfaces

68

Flexible and Visual Appealing UI? QML
– Express a UI the way we think about it: components, views,
states, transitions, animations and effects
– Connect the UI to real data and back-end functionality
– Everything should be fast and easy
– It’s so simply and intuitive that designers and developers can
work directly together
QML is a new declarative language extension to Qt

69

QML Hierarchy

• QML is fundamentally a hierarchy of of
elements with properties
– Single root element
– Parent reference
• Can bind element properties
• Think of a scene graph

70

QML Element Types

71

We’ll be making it easy for you
• All you need is Qt Creator – no SDKs ;)

• Integrated with Remote Device Access (RDA) - you don’t even need a device ;)
• http://www.forum.nokia.com/rda
• No promises here about dates or months yet…

Combine hybrid framework with this one
– isn’t it creepy how easy we can make it for you?

To conclude

What the h
e ck was the
dude talki
ng about?

75

Qt
Qt SDK

Qt modular class library Qt development tools
Qt Creator
Cross‐platform IDE
Core XML
GUI Multimedia
WebKit Database Qt Designer Qt Assistant
Graphics View Network GUI designer Help reader

Scripting Unit Tests
OpenGL Benchmarking
qmake
Qt Linguist
Cross‐Platform
I18N Toolset
Build Tool

Cross‐platform support

Windows Mac OS X Linux/X11 eLinux Win CE Symbian Maemo

Chipsets

*Coming soon
76

Qt is…
•Easy to learn
•Productive
•Supported in several platforms
•Enables using web asset and skills in native applications
•Qt applications have no feature restrictions
•Nokia will be doing it’s own applications on top of Qt

•Get started today : http://qt.nokia.com
•Demo videos of Qt running in maemo and Symbian in
http://www.youtube.com/watch?v=PCx8RfNhhXk

Nokia + Ovi Developer Story | 78

Nokia developer offering, redefined

1= Nokia cross-platform SDKs that you’ll love

2= WRT & Ovi APIs. Amazing features in your
web apps

3= Ovi Store. Sell your app to hundreds of millions

Qt Development Chain - Maemo & Symbian
Distribution Ovi Store

Certification Symbian signed N/A

IDEs •Qt Creator •Qt Creator

•Carbide
Common
offering
•Mobility APIS •Mobility APIs
SDKs
Qt for Symbian platform Qt for maemo platform
&
Plugins Symbian SDKs Maemo SDKs

Symbian Maemo

http://wiki.forum.nokia.com/index.php/Qt_Mobility_Contest

Thank you!

qt.nokia.co
m


Cutest technology of them all - Forum Nokia Qt Webinar December 2009

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