Introduction to Qt / QML (Part 44) - QVariant
Автор: KDAB
Загружено: 2020-12-22
Просмотров: 8483
The QVariant class is a cornerstone in Qt. It's used in the property system in model/view to exchange data between C++ and QML. But what is a QVariant, exactly?
It's a type-erased container, akin to std::any from the C++ Standard Library; a QVariant is able to store an object of any type (well, almost any type) and it also remembers which type it's stored inside. Let's see how QVariant works in practice in this video.
The example code showcased in this video is available here: https://github.com/KDAB/kdabtv
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.
About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services
KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.
Contact us to find out more at [email protected] or visit our website: https://www.kdab.com/software-service...
We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/
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