(Click for larger view of screens from two Qt Extended 4.4 reference designs: a Video IP Deskphone (left) and a mobile phone)

Nokia has re-launched the Norway-based Trolltech as a "fully integrated entity within the Nokia Devices unit, called Qt Software." The move follows Trolltech's acquisition by Nokia in June, around the same time the cell phone giant announced it was purchasing the remaining half of Symbian and planning to recast the Symbian OS as open source software.

A few months earlier, Trolltech changed the name of its Qt-based "Qtopia Core" platform for Linux device development to "Qt for Embedded Linux". The name change reflected the arrival of a new version of Qtopia Core (formerly "QT/Embedded") called "QT for Windows CE." Shipping since May, the new version adds support for both Windows CE and Windows Mobile.

The new Qt Extended, formerly called Qtopia, builds upon Qt for Embedded Linux and its core windowing system with a user interface (UI) and application stack. Earlier versions of Qtopia included the Qtopia Phone Edition, now folded into the Qt Extended framework.


Qt 4.4 architecture
(Click to enlarge)
Qt Extended 4.4 builds upon Trolltech's May release of the cross-platform Qt 4.4 (see diagram above), which is also the foundation of Qt for Embedded Linux. Qt (pronounced "cute") is intended to let developers compile binaries for various platforms -- Linux, Windows, Mac, Java, and now Windows CE -- from a single C++ code base. Comprised of some 400 C++ class libraries, its API is said to be consistent across all supported platforms.

As with Qt 4.4, Qt Extended 4.4 integrates the open source WebKit browser engine. In addition, Qt Extended 4.4 offers a more modular architecture, improved support for touch interfaces, unified messaging support, "Telepathy" instant messaging (IM), and an automated UI test system, says the company.


Qt Extended application screens

The key enhancement to Qt Extended is the reconstitution of the platform into specific modules, said Qt Software CTO Benoit Schillings, in an interview. "Qt Extended is much more configurable by module," he said. "The modules and UI needed for a car navigation system are quite different than say, a cell phone, so now we have different modules for different technologies like Bluetooth and cellular, so it's easier to reconfigure. It also makes testing easier, as developers can now easily replace an individual interface."


Qt Extended 4.4 architecture

Qt Extended, meanwhile is aimed specifically at Linux consumer electronics device UI and application development. Specific new Qt Extended 4.4 features are said to include:

• Modular architecture for feature selection
  
• Touch-based user interface
  
• IP communications framework based on Telepathy for IM (XMPP) and presence
  
• Unified inbox for email, SMS, MMS, and IM
  
• Push IMAP email and other messaging enhancements
  
• Qt UI Test, a tool for automated system tests of target devices
  
• Video IP Deskphone reference design for 3.5-inch touchscreens (see below)
  
• 19 modules (see diagram above), including:
  • Telephony
    
  • Cellular communications
    
  • IP communications
    
  • Bluetooth
    
  • Infrared
    
  • Connectivity
    
  • PIM
    
  • Messaging
    
  • Location
    
  • Essentials
    
  • Games
    
  • Messaging

Qt Extended modules

The Linux SDK for Qt Extended 4.4 is said to offer the following components:

• Qt Designer -- UI and visual form design
  
• Qt Assistant -- presenting online documentation.
  
• Qt Linguist -- internationalization support
  
• Qt Virtual Framebuffer (QVFb) -- testing in desktop environment
  
• QBuild -- build automation and configuration
  
• QtUiTest framework -- system/UI testing

According to Schillings, the inclusion of scripting tools for testing UIs should be particularly welcome among developers. "We've made it easier to validate the UI or the core functioning framework," he said. "We have new tools for UI automation that go beyond screen comparisons. You can really check the value of the UI in a symbolic manner. Clearly, testing is the place where everyone under-invests, so providing these tools should add significant value."

Stated Sebastian Nystrom, VP of Qt Software, Nokia, "Qt Extended is designed to accelerate software development for a wide range of consumer devices, such as video IP phones, media players and other advanced devices. With the new release of Qt Extended, we are making it easier to differentiate the user experience and the feature set."

Availability

Qt Extended 4.4 is available now, says Qt Software. More information may be found here.

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