Common render issues and their solution -Part 3

If you are here from Part 1, you missed Part 2, somehow. You have tried everything from the first two parts that seemed applicable, and your screen is still a window to the void? No problem: we’ve gathered another five reasons black screen issues could be happening and how to go about fixing them. Issue […]

Today's blog post is about something that should be simple and apparently it causes trouble: how to declare a qHash overload for a custom datatype. This is necessary when we want to use custom datatypes as keys in a QHash. From the documentation: A QHash's key type has additional requirements other than being an assignable […]

After four months of intensive development work, I am happy to announce that the first QStringTokenizer commits have landed in what will eventually become Qt 6.0. The docs should show up, soon. While the version in Qt will be Qt 6-only, KDAB will release this tool for Qt 5 as part of its KDToolBox productivity […]

Today, KDAB is releasing version 1.2 of the 3D integration workflow Kuesa 3D, built on top of Qt 3D. Kuesa™ 3D is a complete design-to-code workflow solution for 3D in real-time applications, centered around the open glTF™ 2 format, supported by Blender, Maya and 3ds Max. In short, Kuesa provides a workflow that simplifies work […]

In the last blog post we saw an essential, C++ oriented, Visual Studio Code setup. That was enough to get going right away, but we can still definitely do more and better. Here I'll show you how to get a complete setup for your qmake and CMake projects, all this while also wearing a Qt […]

KDAB's Kevin Funk presented Using Modern CMake with Qt at Qt Virtual Tech Con last month. He reported that the Qt Company did a great job moderating the sessions at this event, and there was a lively Q&A at the end - Kevin had to pick from about 60 questions, so this is a hot […]

My first project when I entered KDAB was the migration of a multi-million lines Motif application to Qt... feels quite scary said like that. Fortunately, migrations from any toolkit to Qt is something KDAB has been doing from the beginning, and has lots of experience with. You may be wondering what this has to do […]

Qt has a long history. The first stable version was released before the first version of C++ was standardized and long before the different C++ compiler vendors started shipping usable implementations of the C++ standard library. Because of this, Qt often followed (and still follows) some design idioms that feel unnatural to the usual C++ […]

Qt 3D, being a retained mode high level graphic API abstraction, tries to hide most of the details involved in rendering the data provided by applications. It makes a lot of decisions and operations in the background in order to get pixels on the screen. But, because Qt 3D also has very rich API, developers […]

A few weeks ago, we published an article with an overview of Visual Studio Code through the eyes of a Qt developer. In this short blog series, I will show you how to get up to speed with a Qt project using Visual Studio Code more in detail. Before digging into the Qt parts, I'd […]

The upcoming version of the C++ Standard (C++2a) is proposing to deprecate certain usages of the volatile keyword, by adopting the P1152 proposal (Deprecating volatile). Despite the somewhat "flamboyant" title, the actual deprecated parts are very limited and indeed the paper limits the deprecation to somehow language/library corner cases and/or dangerous antipatterns. For instance certain […]

Did you miss the past Qt World Summit? Were you there, but you couldn't attend that talk or two that you really wanted to see because the conference was so, so packed with awesome content? Fear no more! We are glad to announce that the talks at the past Qt World Summit 2019 in Berlin […]

A few days ago Marc Mutz, colleague of mine at KDAB and also author in this blog, spotted this function from Qt's source code (documentation): Apart from the mistake of considering empty strings not uppercase, which can be easily fixed, the loop in the body looks innocent enough. How would we figure out if a […]

Have you ever noticed code highlighting disappearing in Qt Creator for some projects, without any apparent reason? Can't get Ctrl+Click to work on any class name or function name anymore? Maybe you have ignored it at first, got used to it, and decided it's just one of those things that just "happen sometimes"; or maybe […]

While the concept of multithreading may be straightforward, code with threads is responsible for some wicked bugs, which can be nearly impossible to reproduce or track down. This makes writing bullet-proof code using threads a tall order. Let's look a little deeper into why that is. First, you need better than average knowledge about the […]

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 -- […]

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 […]