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Writing a Custom Qt 3D Aspect – part 1 Extending Qt 3D via Aspects


Qt 3D has a flexible and extensible architecture that allows us to easily add our own new functionality to it without disrupting the existing features. The functionality of Qt 3D is divided among so-called aspects, each of which encapsulates a particular subject domain such as rendering, input, or animation.

This short series of articles will walk you through the process of adding a new aspect that provides component types and behaviour for a new domain not covered by Qt …

Hotspot v1.1.0 adds timeline and recording features New release of the GUI for the Linux perf profiler

Close to three months after the initial hotspot release, I’m happy to announce the release of version 1.1.0. Quick recap: Hotspot is a graphical frontend to the Linux perf profiler suite. It allows you to visually analyze files with the built-in Flame Graph and the Bottom-Up, Top-Down, or Caller-Callee data tables. It is a free open source R&D project by KDAB, you can find the code on GitHub.

Version 1.1.0 adds two important new features to this …

Clang Tidy, part 2: Integrate qmake and other build systems using Bear Automated refactoring of your source code using powerful open-source tooling


This article is part of a blog series about Clang Tidy. In the previous article we learned about the general usage of Clang Tidy to automatically refactor source code…

clazy 1.2 released presenting 5 new Qt compile-time checks

In the previous episode we presented how to uncover 32 Qt best practices at compile time with clazy. Today it’s time to show 5 more and other new goodies present in the freshly released clazy v1.2.

New checks

1. connect-not-normalized

Warns when the content of SIGNAL(), SLOT(), Q_ARG() and Q_RETURN_ARG() is not normalized. Using normalized signatures allows to avoid unneeded memory allocations.


    // warning: Signature is not normalized. Use void mySlot(int) instead of void mySlot(const int) 

Efficient barcode scanning with QZXing Profiling Qt Zebras Crossing

QZXing is a very useful library: It provides an easy to use Qt integration API around the barcode scanning library ZXing (zebras crossing).

Because it is so easy to setup QZXing in a Qt application, we and most of our customers end up using it when they need to scan images for barcodes. There is, or rather was, a big problem though: When you want to analyze a live camera video stream, e.g. from a phone camera, the latency can …

QStringView Diaries: Advances in QStringLiteral How QStringView Development Also Improves its "Competition"

This is the first in a series of blog posts on QStringView, the std::u16string_view equivalent for Qt. You can read about QStringView in my original post to the Qt development mailing-list, follow its status by tracking the “qstringview” topic on Gerrit and learn about string views in general in Marshall Clow’s CppCon 2015 talk, aptly named “string_view”.

But this post is not about QStringView — yet. It’s about QStringLiteral and its upcoming sister QStringViewLiteral.…

Goodbye, Q_FOREACH A Porting Guide to C++11 Ranged For-Loops

Q_FOREACH (or the alternative form, foreach) will be deprecated soon, probably in Qt 5.9. Starting with Qt 5.7, you can use the QT_NO_FOREACH define to make sure that your code does not depend on Q_FOREACH.

You may have wondered what all the fuss is about. Why is there a continuous stream of commits going to into Qt replacing Q_FOREACH with C++11 ranged for-loops? And why does it take so many commits and several Qt versions to port away …

Qt on Android: How to run C++ code on Android UI thread

I’d like to start a new series of Qt on Android articles, these will be small articles which will focus on useful features that you’ll need on Android but which don’t have any Qt API (yet). I’ll start with two pretty useful functions. These functions will help us to run C++ code directly on Android UI thread without writing any Java code. Qt 5.7 will bring will bring the same functionality.

Until Qt 5.7 is out, we need to …

What is GammaRay? – 3 reasons to start using it today

What is GammaRay? 

For starters, it’s a powerful electromagnetic wave, as well as a way to treat cancer. It’s also an under-appreciated German speed metal band. And it’s what gives Dr. Bruce Banner his big green alter ego. But Qt aficionados will know the GammaRay that we’re talking about is an uber-powerful Qt debugger and introspection tool. If you’re not using it already, read on to find out why it should be part of your go-to toolkit. 

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