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)

Starting with Qt Quick and QML

Qt Quick is another way of creating complete application in place of Qt Widgets. The Qt Quick module provides transitions, animations, and visual effects. You can also customize graphical effects with shaders. This module is especially efficient at making software for devices using touchscreens. Qt Quick uses a dedicated language – the Qt Modeling Language (QML). It is a declarative language, with a syntax similar to that of JSON (JavaScript Object Notation). Furthermore, QML also supports JavaScript expressions inline or in a separate file.

Let's begin with a simple example of a Qt Quick application using QML. Create a new file called main.qml with this code snippet:

import QtQuick 2.5 
import QtQuick.Window 2.2 
Window { 
    visible: true 
    width: 640; height: 480 
    // A nice red rectangle 
    Rectangle {