15.04.2021 
Sometimes it’s useful to establish a connection between a signal and a slot that should be activated only once. This is not how signal/slot connections normally behave. Remember that, when a connection is established, it will stay active until: the connection is explicitly disconnected; or the sender object is destroyed; or the receiver object is […]
KDAB on Qt Get the RSS Feed
Posts about Qt, for feeds like planetqt and planetkde
March ’21 – monthly digest
Blogs Using Qt datatypes in Standard Library unordered containers by Giuseppe D’Angelo In the previous blog post about qHash, we explained: how to declare an overload of qHash for your own datatypes; how to hash Qt datatypes for which Qt does not provide a qHash overload; and why you can’t use a type from the […]
Signal/Slot Connection Throttlers
Another day, another blog post about KDToolBox, KDAB’s collection of miscellaneous useful C++ classes and stuff. Today, we’ll talk about ways to throttle your signal/slots connections — in other words, how to activate a slot less often than the emission rate of the signal it’s connected to. The usual reason why you may want something […]
Qt Desktop Days Returns! CFP now open!
KDAB is bringing you another Qt Desktop Days this May! So, if you missed the first one that was held last September, or if you would like to attend a second, please join us May 19th-20th. That’s a little less than two months away! Qt Desktop Days is primarily a technical event and we want […]
Using Qt datatypes in Standard Library unordered containers
In the previous blog post about qHash, we explained: how to declare an overload of qHash for your own datatypes, how to hash Qt datatypes for which Qt does not provide a qHash overload, and why you can’t use a type from the Standard Library (or just another library) as a key in QHash (newsflash: […]
Qt Embedded Days 2021
This brand new online conference hosted by KDAB offers in-depth technical topics from embedded developers for embedded developers – especially, but not exclusively, for those working with Qt on Embedded Devices. The call for papers is now closed and the program will be announced as soon as the committee has made a final selection. We […]
Efficient custom shapes in QtQuick : shaders
A long time ago, I wrote a post about creating custom shapes in Qt Quick, via the scene-graph APIs. That post covered defining suitable geometry to draw a part of a circle, known also as a ‘sector’, efficiently, since such sectors occur commonly in instrument and vehicle interfaces. I started writing the second part, about […]
A 3D Block Building Game in QML
Here, at KDAB, we get to spend 10% of our time on learning what we don’t know or practicing and improving what we already know. Recently, I decided to use that time to learn more about the Qt Quick Rendering Engine. The best way to do so, I found, is to use it in a […]
KDDockWidgets 1.3.0 released! QtQuick and PySide6 support, and more minor fixes
We’ve released KDDockWidgets 1.3.0! KDDockWidgets is a framework for custom-tailored docking systems in Qt. The main highlights for this release are PySide6 and experimental QtQuick support. The QtQuick backend isn’t production ready, but you can already build with -DKDDockWidgets_QTQUICK=ON, run the examples under examples/qtquick/dockwidgets/ and start reporting issues. Here’s the full list of changes: Experimental QtQuick […]
KDSingleApplication: a class for single-instance policy applications
Another day, another blog about some of KDAB’s utility classes. Now it’s the turn of KDSingleApplication, a class that helps implement applications that follow the single-instance policy. What is a single-instance policy? Single-instance policy refers to those applications that want to spawn a unique instance for a given user session. Even when launched multiple times, […]