Continuing our blog series about KDToolBox, this time we will discuss UiWatchDog, a keepalive monitor for the GUI thread. Alive? A fundamental rule when writing applications in event-driven UI frameworks such as Qt is: do not ever block the GUI thread! The GUI thread is also usually called the main thread of the application -- […]

Back in February we wrote about our work to add 'MacOs touch bar' support to Qt. Between then and now, support has been added in QtCreator: However, the changes have not been integrated upstream in Qt, which means there is still no easy way to add support to your own applications. KDAB is happy to […]

Software developers like tools, and in particular tools that make them more productive. So in this blog post, I am going to share with you some of the experiences some of us here at KDAB have had using Visual Studio Code for Qt development. Motivation of using Visual Studio Code instead of Qt Creator The […]

Right from the start, unu wanted to add a stylish, first-class embedded high-res display to their second generation electric scooter. Like many top-class engineering companies, unu didn’t have in-house expertise for building a modern UI, so they decided to partner with KDAB to build a modern UI based on Qt. In this video you learn […]

KDDockWidgets is an effort by KDAB to provide an advanced docking system for Qt. Throughout the years KDAB has contributed and funded QDockWidget development. Sadly, this wasn't without pain: each change took many days to implement and an equal amount of time to fix regressions. QDockWidgetmixes GUI code with logic/state in a spaghetti manner, making […]

As mentioned in the previous article in this series, Qt 3D 5.14 is bringing a number of changes aimed at improving performance. Most people familiar with Qt 3D will know that the API is designed around the construction of a scene graph, creating a hierarchy of Entities, each of them having having any number of […]

Qt 3D makes heavy use of threads, as a way to spread work across CPU cores and maximize throughput, but also to minimize the chances of blocking the main thread. Though nice on paper, the last case eventually leads to added complexity. Sometimes, there are just one too many threads. In the past, we've been […]

C++ Russia is the premier C++ conference in East Europe which alternates between Moscow and Saint Petersburg. The conference lasts for two days starting October 31st. It will be held in the Park Inn by Radisson Pulkovskaya Hotel in the heart of Saint Petersburg. This year, the speaker line-up is quite impressive and includes names […]

As you already know KDAB is the largest independent contributor to Qt code. Of course we didn't get lazy and we've added a lot of cool stuff to Qt 5.14. In this article I'm going to write about the super cool stuff that we've added to Qt 5.14 for Android. Android multi arch build in […]

With this blog post we are going to kickstart our brand new blog series about KDToolBox. The first class we're exploring is KDTableToListProxyModel, a table-to-list proxy model. The main use case for KDTableToListProxyModel is exposing tabular models to Qt Quick. Qt Quick has a certain number of "view" elements that only support list models: for […]

At KDAB we invest a significant amount of efforts in research and development. We are always looking for new tooling, libraries and utilities that can make our job easier and improve the C++ and Qt ecosystems. Ultimately, the gained knowledge and skills make our customers happier. As part of this process we develop lots of […]

The agenda is published and KDAB engineers are offering a wealth of technical talks this year. Optimizing the Rendering of Qt Quick 2 applications, Giuseppe D'Angelo If you have ever wondered how Qt Quick applications are rendered to the screen, and how to use that knowledge to find and fix performance problems, then this talk […]

In the previous two blogs in this series I showed how solving an apparently simple problem about loading a lot of data into RAM using mmap() also turned out to require a solution that improved CPU use across cores. In this blog, I’ll show how we dealt with the bottleneck problems that ensued, and finally, […]

We have released version 2.11.0 of our Qt application monitoring tool GammaRay. GammaRay allows you to observe behavior and data structures of Qt code inside your program live at runtime. GammaRay 2.11 comes with a new inspection tool for Qt's event handling, providing even more insights into the inner working of your application. Besides looking […]

In the first blog in this series, I showed how we solved the original problem of how to use mmap() to load a large set of data into RAM all at once, in response to a request for help from a bioinformatics group dealing with massive data sets on a regular basis. The catch in […]

Houston, Texas, May 24th, 2019 — KDAB, the Qt®, OpenGL®, and C++® experts, today announced that it has joined the BlackBerry QNX Distributor & Value-Added Integrator Program, a worldwide network of value-added integrators, distributors, and reseller experts trained on QNX technology. Under the agreement, KDAB will provide integration and customization services for a range of […]

A few months ago, we received a phone call from a bioinformatics group at a European university. The problem they were having appeared very simple. They wanted to know how to usemmap() to be able to load a large data set into RAM at once. OK I thought, no problem, I can handle that one. […]

KDAB has released a new version of KDSoap. This is version 1.8.0 and comes more than one year since the last release (1.7.0). KDSoap is a tool for creating client applications for web services without the need for any further component such as a dedicated web server. KDSoap lets you interact with applications which have […]

Those of you who've visited KDAB's offices in Berlin, will know we have a fleet of electric scooters for our staff. You may have even tried one yourself! Today, unu, the Berlin-based mobility company that makes them, launches their latest electric scooter - the unu Scooter. The unu Scooter has been completely redeveloped, is more […]

This is a follow-up post to Qt on CMake Workshop Summary – Feb ’19 Intro From May 2nd to May 3rd another Qt on CMake workshop was hosted at the KDAB premises in Berlin, where interested stakeholders from both The Qt Company and KDAB gathered together to drive the CMake build system in Qt further. […]