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)

Memory using Qcharts

Our second SysInfoWidget is a MemoryWidget class. This widget will display a history of the data so that we can see how the memory consumption evolves over time. To display this data, we will use a QLineSeries class from the Qt Chart module. Create the MemoryWidget class and follow the same pattern we used for CpuWidget:

#include <QtCharts/QLineSeries> 
 
#include "SysInfoWidget.h" 
 
class MemoryWidget : public SysInfoWidget 
{ 
    Q_OBJECT 
public: 
    explicit MemoryWidget(QWidget *parent = 0); 
 
protected slots: 
    void updateSeries() override; 
 
private: 
    QtCharts::QLineSeries* mSeries; 
    qint64 mPointPositionX; 
}; 

Instead of a being QPieSeries*, mSeries is a type of QLineSeries* that will be linked to the chart object in a very similar fashion to MemoryWidget.cpp:

#include "MemoryWidget.h" 
#include <QtCharts...