QtQuick includes basic visual item to construct many common user-interface components, but people often ask how to create different visual appearances, beyond rectangles, round-rectangles and images. There’s various solutions to this problem, and with Qt 5.10, there’s the new Shapes module which makes it easy to define paths, ellipses and other standard SVG drawing elements. […]

For SIGGRAPH, KDAB has been working on a new Qt 3D based demo. We decided that instead of using C++, it would be interesting to try out PySide2 and harness Python to drive the application. The idea behind this demo is to do with data acquisition of a vehicle's surrounding environment. Once the data is […]

With all the advances being made in Qt 3D, we wanted to create some new examples showing some of what it can do. To get us started, we decided to use an existing learning framework, so we followed the open source Tower Defence course, which you can find at CGCookie. Being a game, it allows […]

There has been a lot of back and forth around the use of Free Software in public administration. One of the latest initiatives in this area was started by the Free Software Foundation Europe, FSFE. It focuses on the slogan: Public Money - Public Code. There are various usage scenarios for Free Software in public […]

The Qt model/view APIs are used throughout Qt -- in Qt Widgets, in Qt Quick, as well as in other non-GUI code. As I tell my students when I deliver Qt trainings: mastering the usage of model/view classes and functions is mandatory knowledge, any non-trivial Qt application is going to be data-driven, with the data […]

Some months ago Shawn Rutledge blogged about the new QtPdf module, a Qt wrapper around the PDFium library, which allows you to render PDF documents to QImages. Since that blog post we have invested some more work into the module to make it more useful in your day-to-day projects. One long-standing bug report against Qt […]

While I was working on a yet-to-be-announced super secret and cool Qt on Android project, I had to do a lot of debugging. This way I found that debugging Qt apps on Android using QtCreator was ok, but it had some issues, which was kinda frustrating. First issue was that I could not debug on […]

During the last couple of months KDAB engineers have been working on improving CUPS printing support for Linux in Qt. This work has been sponsored by the LiMux project, a big thank you to them for allowing us to spend time improving Qt :). We started in early December with a series of small commits […]

Declarative Widgets is a QML plugin that adds Qt Widgets support to QML. This means we can now easily mix the power of QML with the comfort of a Widgets UI on desktop. Background Declarative Widgets was born out of a breakfast discussion about how awesome it would be to use QML to describe QWidget-based […]

Many new features were added to Qt 3D in the 5.10 release. One of them is the support for sprite sheets, contributed by KDAB, as provided by QSpriteGrid and QSpriteSheet and their respective QML items. One way of animating things is to switch between many different versions of the same object at different points in […]

With the introduction of the Qt Quick software renderer it became possible to use Qt Quick on devices without a GPU. We investigated how viable this option is on a lower end device, particularly the NXP i.MX6 ULL. It turns out that with some (partially not yet integrated) patches developed by KDAB and The Qt […]

Clazy is a Clang plugin which extends the compiler with over 50 warnings related to Qt best practices ranging from unneeded memory allocations to API misuse. It’s an opensource project spawned by KDAB’s R&D efforts for better C++ tooling. At KDAB, we have a pretty cool Continuous Integration infrastructure to take care of our customers’ […]

We are happy to announce the release of Qt Automotive Suite 2.0, the Qt solution for digital cockpits, developed in collaboration between KDAB, The Qt Company and Luxoft. The Qt Automotive Suite provides OEMs and Tier1s with powerful frameworks and tools to build a consistent user experience for both the instrument cluster and the center […]

We have released version 2.9.0 of our Qt application introspection tool GammaRay. GammaRay allows you to observe behavior and data structures of Qt code inside your program live at runtime. GammaRay 2.9 introduces a number of new features interesting to Qt Quick, QWidgets, Qt 3D and non-graphical Qt users alike. Qt Quick One focus area […]

Today I want to share 13 mistakes regarding signals, slots and connect statements and how to find them at compile time with clazy, our open-source static-analyzer for Qt. Clazy is a compiler plugin which generates warnings related to Qt. You can read more about it in our previous blog posts: How to use static analysis […]

Through their partnership, Qi and KDAB have developed imaging software to help researchers gain a deeper understanding of the progression of cancer on a cellular level, using Qt. Qi, KDAB and Qt have now taken their collaboration one step further by introducing nanoQuill, otherwise known as “The Coloring Book of Life,” which is a crowdsourced […]

So, last time we spoke, I left you this teaser... I mean how hard could it be? right? OK So, hum, an easy enough exercise..... for a path-based animation like we saw last time. But how do I draw such a path? How do I time the inflections in speed for that path, since time […]

Introduction In the previous article we gave an overview of the process for creating a custom aspect and showed how to create (most of) the front end functionality. In this article we shall continue building our custom aspect by implementing the corresponding backend types, registering the types and setting up communication from the frontend to […]

KDAB has unique experience in porting the code base for toolkits like Qt 3, Qt 4, Motif, Java, Tcl, GTK, .NET, MFC, and Photon to Qt 5. Porting legacy GUI toolkits to Qt 5 is a job where proven experience saves a lot of time. In this presentation we highlight the main problems facing developers […]

Introduction 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 […]