Four months back, in July 2011, the very first wave of Qt Quick Components found it's way to Symbian 3 and Symbian Anna devices. Lately Nokia N9 began shipping with the pre-installed set of Qt Quick Components for MeeGo 1.2 Harmattan.
Development continues, and now Qt Quick Components 1.1 for Symbian is out!
This update is a part of a new released bundle for Symbian Anna and Symbian Belle. It contains Qt 4.7.4, Qt Quick 1.1 and Qt Quick Components 1.1 for Symbian, enabling rapid application UI design and development. For more information about the full content of the Qt release bundle, read this blog post Qt 4.7.4 Release Bundle for Symbian news by Aleksi Uotila.
Qt Quick Components 1.1 for Symbian introduces new features:
and it brings new useful components:
To get started with our new offerings, download updated Qt SDK, find updated design guidelines at Nokia Developer site and learn how to utilize ~50 ready made building blocks in your Qt Quick application. The deployment of the new Qt release bundle for Symbian ensures a remarkable device base and opportunity for high volume downloads for your Qt Quick application in the Nokia Store (see Aleksi's blog post for more details).
There is new handy functionality in this update and also the non-functional part has been improved under the hood. Creation times of the Qt Quick Components have been monitored and based on findings the slowest components have been optimized, for example TextArea and TextField components have been improved a lot. ListView scrolling speed is fluent now, a major finding has been that ListView scrolling speed depends on how fast the delegates are. It is possible to achieve performance close to 60 frames per second (fps) when ListItem, ListItemText or Image delegates are used.
Having improvements in a stack is an important step forward, but equally important to that is to have optimized design at the application level. The very first step towards better performing Qt Quick applications using Qt Quick Components is to avoid some common mistakes. At the end of the day, different use cases in different kind of applications should be analysed case by case, but here are a few generic performance improvement tips that should be taken into account in most applications:
Download the latest release here: www.qt.io/download.
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