Qt 4.7 has been available as a preview version for a number of months, but has now been given its formal release. This marks the stable release point, indicating a readiness for main stream usage.
In addition to the introduction QML and Qt Declarative Qt 4.7 includes some important performance improvements, including improved QtWebKit performance, faster text rending with the new QtStaticText class and more.
Sebastian Nyström, Vice President, Application and Service Frameworks, Nokia:
"Qt 4.7 is an important step forward that keeps Qt at the forefront of UI and application development frameworks. Developers looking to create rich, fluid UIs and apps will be amazed at how easy it is to use the new features in Qt 4.7. Continuing to enhance Qt’s performance and stability is vital, and we’re proud to have taken Qt even further in these two areas."
Symbian and MeeGo support for Qt 4.7
The generic SDK version of Qt 4.7 is now available. However the Qt 4.7 version of the the mobile specific version, Nokia Qt SDK, has not yet been released. The Nokia Qt SDK is a custom version of the Qt SDK, which includes all the necessary tools for building Qt content for Nokia devices. Notably this includes a customised version of Qt Creator (IDE), the Qt Smart Installer (easier distribution) and the Qt Mobility APIs (additional cross platform APIs for common 'mobile' functions). An updated version of the Nokia Qt SDK will be made available in due course.
MeeGo 1.1, currently available in preview released, has built in support for Qt 4.7. Symbian^1 and earlier devices require a one-off Qt install, but in most cases this will be facilitated by the Qt Smart Installer, which can also provide an upgrade to Qt 4.7. Symbian^3 ships with Qt 4.6 built in; this will likely be updated in due course (i.e. in later Symbian^3 devices). Symbian^3 devices with Qt 4.6 installed will be upgraded through firmware updates and/or Qt Smart Installer.
What this means is that Qt 4.7 will rapidly become the Qt version of choice for developers looking to target Nokia's mobile devices. Its fully backwardly compatible with older versions (i.e. Qt 4.6), but the new version offers both performance improvements and access to some additional APIs.
Going forward Qt, along with WRT, is Nokia's language of choice for developing content on its mobile devices. Judging by the conversations I had at Nokia World it has been very well received by most developers. While its cross platform (with MeeGo) credentials were considered beneficial, the biggest plus for many was the way it made development easier and faster. Many of the developers I spoke expressed the opinion the the Nokia Qt SDK was as good as, or better, than the competing tools and SDKs on other platform; something which the majority felt was long over due.