With QML as abstraction layer, we nowadays have a great way to separate the business logic (C++) of our application from the graphical user interface (QtQuick/QtWidgets/Cascades) on top of it. The interface between the two layers is well defined by the meta-object API, which essentially boils down to signals and slots for notifications and invocations, […]
KDAB on Qt Get the RSS Feed
Posts about Qt, for feeds like planetqt and planetkde
OpenGL in Qt 5.1 – Part 5
This article concludes our series on what is new in Qt 5.1 with respect to OpenGL. Earlier articles in this series are available at: Part 1 Part 2 Part 3 Part 4 More shader stages In Qt 5.0 the QOpenGLShader and QOpenGLShaderProgram classes only had support for Vertex and Fragment shaders. Qt 5.1 will include […]
Qt DevDays 2013 – Save the dates!
We are pleased to announce the dates for this year’s Premier Qt Event of the Year in Europe and North America: Berlin: October 7 – 9 Silicon Valley, CA: November 6 – 8 This is the 10th Annual Qt Developer Days and, as last year, will be co-hosted by KDAB, ICS and Digia. Once again […]
How to use helgrind to debug multithreaded Qt applications Finding thread race conditions in Qt4 and Qt 5
You’ve heard of valgrind before, its default tool (memcheck) is such a life saver, being able to detect memory-related bugs in your code (leaks, double deletions, use of deleted memory, use of uninitialized memory, etc.). Well, it turns out that valgrind also comes with a tool to detect race conditions between threads, in multithreaded applications. […]
OpenGL in Qt 5.1 – Part 4
This article continues our series on what is new in Qt 5.1 with respect to OpenGL. Earlier articles in this series are available at: Part 1 Part 2 Part 3 OpenGL Debug Output The traditional way to debug OpenGL is to call glGetError() after every GL function call. This is tedious, clutters up our code, […]
OpenGL in Qt 5.1 – Part 3
This article continues our series on what is new in Qt 5.1 with respect to OpenGL. If you haven’t already seen them, you may be interested in reading Part 1 and Part 2. Timer Queries OpenGL on the desktop exposes a very useful tool in the shape of timer query objects. These can be used […]
OpenGL in Qt 5.1 – Part 2
OpenGL in Qt 5.1 – Part 1
QML Engine Internals, Part 3: Binding Types
This blog post is part of an ongoing series about the internals of the QML engine. In the last blog post, we covered how bindings in the QML engine work. In this post, we’ll examine the different kind of bindings. Some of this content is already covered by my DevDays talk QtQuick Under the Hood. […]
One DataModel to filter them all
Today I want to talk about the usage of data models in Cascades. As you might know already, Cascades provides the abstract interface bb::cascades::DataModel, which is used by bb::cascades::ListView to retrieve and display arbitrary data. Cascades also provides a couple of convenience classes that implement this DataModel interface, namely ArrayDataModel GroupDataModel QListDataModel XmlDataModel While the […]