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Posts about Qt, for feeds like planetqt and planetkde

10.10.2017 No comments

KDAB, MyScript and Qt Company to create new, non-distractive input method for the Automotive Industry

KDAB will be partnering with MyScript and The Qt Company to incorporate MyScript’s handwriting input technology into the Qt Automotive Suite. This integration will enable multimodal input capabilities using either the existing Qt Virtual Keyboard or a new handwriting input panel powered by MyScript technology.

KDAB’s Jan Arne Petersen will demonstrate some of the potential of this integration in his “Using Virtual Keyboards on Qt Embedded Devices” presentation at Qt World Summit 2017.

Volker Krause, Director Automotive …

06.10.2017 No comments

Clazy Results Visualizer for Qt Web UI to view clazy and gcc warnings

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.

Today, we’re proud to announce a Clazy Web UI to view all warnings emitted by Clazy, as well as normal gcc/clang issues.

Furthermore, we’ll be hosting it publicly for the Qt code base. This means that you can now head …

29.09.2017 No comments

Hotspot v1.1.0 adds timeline and recording features New release of the GUI for the Linux perf profiler

Close to three months after the initial hotspot release, I’m happy to announce the release of version 1.1.0. Quick recap: Hotspot is a graphical frontend to the Linux perf profiler suite. It allows you to visually analyze perf.data files with the built-in Flame Graph and the Bottom-Up, Top-Down, or Caller-Callee data tables. It is a free open source R&D project by KDAB, you can find the code on GitHub.

Version 1.1.0 adds two important new features to this …

28.09.2017 No comments

GammaRay 2.8.1 Release

We have released version 2.8.1 of our Qt application introspection tool GammaRay. This release contains a number of important bugfixes as well as support for Qt 5.9.2. Especially if you are experiencing corrupt views or crashes when searching in the object tree, or having trouble attaching to a process on Windows, you want to upgrade to the new version. The same applies to users of bleeding edge Qt versions experiencing build failures.

Next to maintaining the 2.8 series we …

28.09.2017 No comments

Lots of lights: Generating cities Data visualization with Qt 3D, OpenGL and C++

Sometimes data visualization might call for more than a graph – you need to visualize complex data, such as that generated by city lighting, in three dimensions to get the full effect.

KDAB decided to put together a showcase for the Qt World Summit that allowed us to demonstrate Qt 3D’s capabilities as a performant next-generation graphics engine, which can draw thousands of lights and objects simultaneously. This also enabled us to show what modern technologies like Qt 3D can …

30.08.2017 No comments

Profiling QtQuick HMI Performance on Embedded Linux by Thomas McGuire

QtQuick is a popular choice for creating HMIs for embedded devices. The hardware on these devices is often constrained and less performant than their desktop equivalents, this requires extra care from software developers in delivering a fluid user experience. KDAB is regularly involved in improving the performance of QtQuick HMIs on such devices for their customers.

In this demonstration, we will show how to profile and optimize the performance of a QtQuick speedometer, an example taken from an actual embedded …

07.08.2017 No comments

Qt talks at CppCon 2017

The program for CppCon 2017 is now published!

CppCon is the annual conference for the C++ community: five days packed with over 100 talks, as well as inspiring keynotes, panel discussions, hallway chats, fun evening events and much more. CppCon is a project of the Standard C++ Foundation, a not-for-profit organization whose purpose is to support the C++ software developer community and promote the understanding and use of modern, standard C++ on all compilers and platforms.

It’s our pleasure …

07.08.2017 One comment

New in Qt 5.10: Diagnostics when breaking QML bindings

Property bindings are one of the most interesting features of the QML language. In QML, when we set a value on a property, the right hand side expression isn’t evaluated just once to produce a value, like in a ordinary imperative language.

In particular, if the expression involves other properties, then the property we’re setting becomes bound to the properties in the expression: whenever they change their values, then the expression is automatically evaluated again, and the target property value …

25.07.2017 3 comments

Clang Tidy, part 2: Integrate qmake and other build systems using Bear Automated refactoring of your source code using powerful open-source tooling

Introduction

This article is part of a blog series about Clang Tidy. In the previous article we learned about the general usage of Clang Tidy to automatically refactor source code…

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