Seven days after the release of the Tech Preview 1, we released the latest stable Windows build of Fotowall  that was based on Qt 4.6. Somebody could argue that this is a bit imprudent. We did that because the benefits of the 4.6 release are worth the risk of the move!
Indirect Benefits, or ‘what you get for free’
- Improved quality and better speed in the OpenGL QPainter
- Better speed in the GraphicsView framework
- Animation Framework: this simply r0cks! I don’t know about the whole Kinetic stuff, I just mean the ability to create simple property animations.
I don’t have a video to show you but just take a look at the Fotowall’s Top-Bar, the tabs appear and disappear with a nice and smooth grow-shrink animation, that make the program look soo 2009-ish! finally!
- QNetworkReply::isFinished(): thanks to this method I could implement a smart time-saver: when the user starts to drag a flickr picture, Fotowall starts downloading it. It can happen that, upon drop, the content has already been completely downloaded (so it can be placed in the canvas) or partially downloaded (so the used only needs to wait for the missing percent)
- There are some graphics glitches when animating the opacity property of a QGaphicsProxyWidget (in OpenGL)
- Even by setting the QGraphicsItem::ItemSendsGeometryChanges flag, the previous behavior is not perfectly restored (we used itemChange, and the new behavior doesn’t allow Fotowall’s mirrors to sync properly to the objects)
I’ve tried hard to record a screencast about the Cuteness & Performance of Qt 4.6, but in the end I had to use my camera.
Thanks Nokia for this great release!
 Fotowall is a creative program to mix local and online graphics content and build original work.