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)

Spying on your application with QSignalSpy

The last part we will cover in the Qt Test framework is the ability to spy on signals with QSignalSpy. This class allows you to do the introspection of the emitted signal of any QObject.

Let's see it in action with SoundEffectWidget. We will test QSignalSpy when the SoundEffectWidget::play() function is called, the soundPlayed signal is emitted with the correct soundId parameter.

Here is the playSound() function of TestGui:

#include <QTest> 
#include "MainWindow.h" 
// In TestGui.h 
class TestGui : public QObject 
    void controlButtonState(); 
    void playSound(); 
// In TestGui.cpp 
#include <QPushButton> 
#include <QtTest/QtTest> 
#include "SoundEffectWidget.h" 
void TestGui::playSound() 
    SoundEffectWidget widget; 
    QSignalSpy spy(&widget...