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)

Discovering QThread

Qt provides a sophisticated threading system. We assume you already know threading basics and the associated issues (deadlocks, threads synchronization, resource sharing, and so on) and we will focus on how Qt implements it.

QThread is the central class of the Qt threading system. A QThread instance manages one thread of execution within the program.

You can subclass QThread to override the run() function, which will be executed in the QThread framework. Here is how you can create and start QThread*:

QThread* thread = new QThread();

The start() function will automatically call the run() function of the thread and emit the started() signal. Only at this point will the new thread of execution be created. When run() is completed, the thread object will emit the finished() signal.

This brings us to a fundamental aspect of QThread: it works seamlessly...