We are happy to announce the release of KDDockWidgets version 1.7.0! What is KDDockWidgets? KDDockWidgets is a development framework for custom-tailored docking systems in Qt, to use when you need advanced docking that is not supported by QDockWidgets. It was created by Sérgio Martins as a time-saving alternative to QDockWidgets. The ease-of-use of KDDockWidgets can […]

Background of Shaders One particular facet of modern graphics development that is often a pain - even for AAA games -- is shader variants! If you have bought an AAA game in recent years and wondered what the heck it is doing when it says it is compiling shaders for a long time (up to […]

The familiar solution for thick value classes that want to preserve binary compatibility is to use the pimpl pattern (private implementation), also known as d-pointer (pointer to data). In future versions of our class, we can freely change the contents of the pimpl (i.e. adding, removing, and/or modifying data members) but the binary compatibility of […]

We just released CXX-Qt version 0.5! CXX-Qt is a set of Rust crates for creating bidirectional Rust ⇄ C++ bindings with Qt. It can be used to integrate Rust into C++ applications using CMake or build Rust applications with Cargo. CXX-Qt provides tools for implementing QObject subclasses in Rust that can be used from C++, […]

Not all Qt developers are using Qt Creator as their main IDE for development. Some of us are using other IDEs, like Visual Studio, Visual Studio Code or CLion, per choice or because a project requires it. On Windows, with the MSVC compiler, the debugging experience with Qt 6 can be quite frustrating for some […]

Given a strictly positive integer i, this code will calculate i+1 "equally spaced" values between 1 and 0: If you're looking for a trap, this does actually work for any i > 0. One can verify it experimentally; run the code with i from 1 to INT_MAX. For simplicity, just consider the case j = […]

A very common implementation pattern for QObject subclasses is to declare its child QObjects as data members of type "pointer to child." Raise your hand No, keep your hand on your computer input device :-) Nod if you have ever seen code like this (and maybe even written code like this yourself): A fairly common […]

Are you already convinced and just want to download the library? We're glad you liked it: https://github.com/KDAB/KDAlgorithms I'm sure many people have told you time and time again, "Don't use raw for loops; use algorithms." Still, each time you tried, you found your code harder to read. In case you're wondering, the above simply prints […]

If you're following our Youtube channel you might have heard me talking about QVarLengthArray. If you're not... you should follow us! But let me give you a quick recap. QVarLengthArray is a Qt container that acts like a vector; its elements are stored contiguously in memory and it has a dynamic size. At any time […]

If you’re a reader of this blog, you probably know that we have a huge amount of quality material on QML and Qt Quick, among other topics. In fact, there is so much material that it can be hard to find what you need. If that sounds familiar, you’ll want to bookmark this page! This […]

This blog will give you a brief overview of profiling C and C++ applications. Additionally, it will lay before you all of the tools available, with the purpose of aiding you in choosing the right tools at the right times. The Steps for Profiling Before we look at the actual tools, let's go over the […]

Hotspot 1.4.0 has been released! Hotspot is a replacement for perf report. It's a GUI for the perf profiler that takes a perf.data file, parses and evaluates its contents, and then displays the result in a graphical way. This feature release contains close to 400 commits since the last stable v1.3.0 release. It comes with […]

We just released CXX-Qt version 0.4! CXX-Qt is a set of Rust crates for creating bidirectional Rust ⇄ C++ bindings with Qt. It can be used to integrate Rust into C++ applications using CMake or build Rust applications with Cargo. CXX-Qt provides tools for implementing QObject subclasses in Rust that can be used from C++, […]

NVIDIA is world renowned as a leader in computer graphics, AI, and Data Centre solutions. It nurtures an ecosystem for developers and enables cutting edge 3D Graphics through its GeForce, Quadro, and Tegra lines of GPUs that provide powerful computing ability and cutting-edge features such as ray tracing. NVIDIA supports developers with performance optimization tools […]

Every now and then, when I submit some code for a code review, people tell me that I forgot qAsConst. Now I have one more enemy, namely: Clazy! It has also started saying this, and I guess it's about time for me to figure out what is going on. When do I need qAsConst and […]

In this blog on debugging and profiling, I would like to give you an overview of the debugging tools that exist for C and C++ applications. Automated Testing The first thing you need to do is make sure your code is properly tested. This, in itself, is not debugging, but it enables you to make […]

KDAB will be Gold sponsors at this year’s free online edition of Qt World Summit on November 9th, 2022. Our very own Jesper Pedersen will present his talk “Highlights from Qt Widgets and More”. Don’t miss out! Join developers, designers, managers, and executives to get inspired by the latest developments with Qt. Register now and […]

I will be talking about text in this post, specifically about cases where you have to handle a lot of it. We are not talking about a general solution, but a specific case that we encountered during a customer project. The Problem The project involved showing a chat room for internal communication. We developed a […]

We just released KDChart version 3.0.0! KDChart is a comprehensive business charting package with many different chart types and a large number of customization options. We are constantly improving the package, and have been doing so for years. This is the first release of KDChart that supports Qt 6, and both Qt 5 and Qt […]

For years, we at KDAB have been using Buildbot as our build and continuous integration system. Gerrit hosts all our projects and is our code review platform. Our deployment of Buildbot and build machines has naturally grown over the years. It builds hundreds of configurations and up to a thousand builds daily, but issues with […]