Book Image

Mastering Qt 5 - Second Edition

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5 - Second Edition

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.11 is an app development framework that provides a great user experience and develops full capability applications with Qt Widgets, QML, and even Qt 3D. Whether you're building GUI prototypes or fully-fledged cross-platform GUI applications with a native look and feel, Mastering Qt 5 is your fastest, easiest, and most powerful solution. This book addresses various challenges and teaches you to successfully develop cross-platform applications using the Qt framework, with the help of well-organized projects. Working through this book, you will gain a better understanding of the Qt framework, as well as the tools required to resolve serious issues, such as linking, debugging, and multithreading. You'll start off your journey by discovering the new Qt 5.11 features, soon followed by exploring different platforms and learning to tame them. In addition to this, you'll interact with a gamepad using Qt Gamepad. Each chapter is a logical step for you to complete in order to master Qt. By the end of this book, you'll have created an application that has been tested and is ready to be shipped.
Table of Contents (16 chapters)

Making your objects serializable with QVariant

Now that we have implemented the logic in our business classes, we have to think about what we are going to serialize and how we are going to do it. The user interacts with a Track class that contains all the data to be recorded and played back.

Starting from here, we can assume that the object to be serialized is Track, which in turn should somehow bring along its mSoundEvents containing a list of SoundEvent instances. To achieve this, we will rely heavily on the QVariant class.

You might have worked with QVariant before. It is a generic placeholder for any primitive type (char, int, double, and so on), but also for complex types (QString, QDate, QPoint, and many more).


The complete list of QVariant-supported types is available at http://doc.qt.io/qt-5/qmetatype.html#Type-enum.

A simple example of QVariant is as follows:

QVariant...