Many KDAB engineers are part of the Qt Security Team. The purpose of this team is to get notified of security-related issues, and then decide the best course of action for the Qt project. Most of the time, this implies identifying the problem, creating and submitting a patch through the usual Qt contribution process, waiting […]

GammaRay 2.6 brings you three major new features: We merged the previous model and selection models tools into a new, unified QAbstractItemModel inspector, allowing you to now also see selections and cell flags, as well as to inspect deactivated cells. The new Wayland compositor inspector enables you to observe Wayland clients of a QtWayland compositor, […]

Hello! This is a small wrap-up fromQtCon, the biggest Qt event in Europe in 2016, that happened at the beginning of September. At QtCon the Qt community joined forces with the KDE, FSFE and VideoLAN communities, to create an exciting event in the spirit of open collaboration and participation amongst projects. During QtCon many KDAB […]

GammaRay 2.5 has been released, the biggest feature release yet of our Qt introspection tool. Besides support for Qt 5.7 and in particular the newly added Qt 3D module a slew of new features awaits you, such as access to QML context property chains and type information, object instance statistics, support for inspecting networking and […]

KDStateMachineEditor is a Qt-based framework for creating Qt State Machine metacode using a graphical user interface. It works on all major platforms and is now available as part of the Qt Auto suite. The latest release of KDAB's KDStateMachineEditor includes changes to View, API and Build system. View Button added to show/hide transition labels Now […]

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 APIs that can be exported as SOAP objects. The web service then provides a machine-accessible interface to its functionality via HTTP. You can […]

KD Chart 2.6.0 is a maintenance release with a limited number of new features. This release publishes feature additions and bugfixes since KD Chart 2.5.1. KDAB continues to offer a commercial license without flat fee support for KD Chart. Features: - Code updated to compile with Qt 5.6 - Optional line breaking for horizontal legends […]

We released a new major version of GammaRay, KDAB's Qt runtime introspection tool, in December 2015. Besides bringing you initial support for Qt 5.6, we focused on enhancing your productivity with large target applications. This includes various performance improvements such as a much faster object search, a new property editor that can dive into composite […]

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 […]

The latest release of KD Reports further enhances your ability to get printable and exportable reports from code and XML descriptions. For those who like using CMake instead of qmake, you'll be glad to know KD Reports now comes with a fully functioning CMake buildsystem (see INSTALL-cmake.txt). In addition, we have added Frame element and […]

It's usually said "only improve performance where a profiler tells you to". I don't completely agree. Take a big C++ library like Qt: can you profile all classes and all code paths ? It would take a couple of years to accomplish and analyse the results. It's expensive: It usually only happens if the speed-up […]

Quick overview of profiling tools QtQuick is often used to create UIs for embedded devices. One SoC that is quite popular at the moment is the i.MX 6 board from Freescale, with its Vivante GC2000 or GC880 3D GPU. Performance on such a device matters, users expect a fluid interaction. With the QML Profiler, Qt […]

Qt on Android Tutorial (please adjust volume / low sound): Abstract: The tutorial will start with instructions on how to setup the development environment, how to configure QtCreator and ensuring that all dependencies are met. It will then continue with a live demonstration on creating an app, deploying it to an Android device and debugging […]

One type of bug I see very often comes down to syntax errors in QML and JavaScript files. Most of the time these errors are simple typos; however, they creep in, go unnoticed by continuous integration and sometimes reach production -- especially on delayed loaded components. I like fixing bugs, but what I love even […]

The Challenge Previously on this blog, we featured a series of articles about our QML-based presentation tool, SlideViewer. To quickly recap: SlideViewer is a presentation program that allows writing slides entirely in QML. There are situations in which the slide deck needs to be available in PDF format in addition to the QML source: For […]

A couple of months ago, Jesper Pedersen introduced our presentation tool for trainings, called SlideViewer. As SlideViewer is mainly used for our Qt and Squish trainings, we naturally have many code examples on the slides, ranging from C++ and QML to Python and XML. In this blog post, we will take a closer look at […]

Several previous posts have introduced our SlideViewer tool which we created for use in the various trainings we deliver. The tool started out as an experiment, created using basic QtQuick 2 Items. Startup configuration was specified by command line arguments, and a simple Keys.onPressed function provided most of the runtime control: both navigating around the […]

This is a typical situation when you program a GUI for an application. You have just created a new control, you start your application and... no control. But now: Is it obscured? Is it misplaced? Is it completely transparent or set to 'invisible'? Is my custom OpenGL-stuff broken or is the item actually not created […]

Introduction Following on from the previous articles on SlideViewer, we shall now investigate another piece of the puzzle towards making SlideViewer usable in practise. Namely, getting the content rendered from our domain specific language and on to the screen or projector for the audience to marvel at. Those of you that have ever presented at […]

Introduction At Qt developer Days in Berlin 2013 I had an Aha! moment. I saw a presentation written in QML rather than the usual Powerpoint/LibreOffice/Keynote. It wasn't that I did not imagine this was possible, rather the contrary, after all in KDAB we have more than 3000 slides on Qt-related topics, all written in .... […]