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Mastering Qt 5
Mastering Qt 5

Mastering Qt 5: Create stunning cross-platform applications

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Profile Icon Guillaume Lazar Profile Icon Robin Penea
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€36.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.2 (10 Ratings)
Paperback Dec 2016 526 pages 1st Edition
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Arrow left icon
Profile Icon Guillaume Lazar Profile Icon Robin Penea
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Paperback Dec 2016 526 pages 1st Edition
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€20.98 €29.99
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Mastering Qt 5

Chapter 2.  Discovering QMake Secrets

This chapter addresses the issue of creating a cross-platform application that relies on platform-specific code. We will see the impact of qmake on the compilation of your project.

You will learn how to create a system monitoring application that retrieves the average CPU load and the memory used from Windows, Linux, and Mac. For this kind of OS dependent application, architecture is the key to keeping your application reliable and maintainable.

At the end of this chapter, you will be able to create and organize a cross-platform application that uses platform-specific code and displays Qt Charts widgets. Moreover, qmake will not be a mystery anymore.

This chapter covers the following topics:

  • Platform-specific code organization
  • Design patterns, strategy, and singleton
  • Abstract class and pure virtual function
  • Qt Charts
  • The qmake tool

Designing a cross-platform project

We want to display some visual gauges and chart widgets, so create a new Qt widgets Application called ch02-sysinfo. As already discussed in Chapter 1Get Your Qt Feet Wet, Qt Creator will generate some files for us: main.cppMainWindow.hMainWindow.cpp, and MainWindow.ui.

Before diving into the C++ code, we must think about the software's architecture. This project will handle multiple desktop platforms. Thanks to the combination of C++ and Qt, most of the source code will be common to all targets. However, to retrieve both the CPU and memory usage from the OS (operating system), we will use some platform-specific code.

To successfully achieve this task, we will use two design patterns:

  • Strategy pattern: This is an interface that describes functionalities (for example, retrieve CPU usage), and specific behaviors (retrieve CPU usage on Windows/Mac OS/Linux) will be performed into subclasses that implement this interface...

Transforming SysInfo into a singleton

Promises are made to be kept: we will now transform the SysInfo class into a singleton. C++ offers many ways to implement the singleton design pattern. We will explain one of them here. Open the SysInfo.h file and make the following changes:

class SysInfo 
{ 
public: 
    static SysInfo& instance(); 
    virtual ~SysInfo(); 
 
    virtual void init() = 0; 
    virtual double cpuLoadAverage() = 0; 
    virtual double memoryUsed() = 0; 
 
protected: 
    explicit SysInfo(); 
 
private: 
    SysInfo(const SysInfo& rhs); 
    SysInfo& operator=(const SysInfo& rhs); 
}; 

The singleton must guarantee that there will be only one instance of the class and that this instance will be easily accessible from a single access point.

So the first thing to do is to change the visibility of the constructor to protected. This way, only this class and the child classes will be allowed to call the constructor.

Since only one instance of the object must...

Exploring Qt Charts

The core part is ready. It's now time to create a UI for this project, and Qt Charts can help us with this task. Qt Charts is a module that provides a set of easy-to-use chart components, such as line chart, area chart, spline chart, pie chart, and so on.

Qt Charts was previously a commercial-only Qt module. Since Qt 5.7, the module is now included in Qt on GPLv3 license for open source users. If you are stuck on Qt 5.6, you can build the module by yourself from sources. More information can be found at https://github.com/qtproject/qtcharts.

The aim now is to create two Qt widgets, CpuWidget and MemoryWidget, to display nice Qt charts of the CPU and the memory used. These two widgets will share a lot of common tasks, so we will first create an abstract class, SysInfoWidget:

Exploring Qt Charts

Then the two actual widgets will inherit from the SysInfoWidget class and perform their specific tasks.

Create a new C++ class called SysInfoWidget with QWidget as a base class. Some...

CpuWidget using QCharts

Now that the base class SysInfoWidget is ready, let's implement its first child class: CpuWidget. We will now use the Qt Charts API to display a good-looking widget. The average CPU load will be displayed in a pie graph with a hole in the center, like a partly eaten donut where the eaten part is the percentage of the CPU used. The first step is to add a new C++ class named CpuWidget and make it inherit SysInfoWidget:

#include "SysInfoWidget.h" 
 
class CpuWidget : public SysInfoWidget 
{ 
public: 
    explicit CpuWidget(QWidget* parent = 0); 
}; 

In the constructor, the only parameter needed is a QWidget* parent. Since we provided default values for the startDelayMs and updateSeriesDelayMs variables in SysInfoWidget class, we get the best possible behavior; there is no need to remember it when subclassing SysInfoWidget, but it is still easy to override it if need be.

The next step is to override the updateSeries() function...

Designing a cross-platform project


We want to display some visual gauges and chart widgets, so create a new Qt widgets Application called ch02-sysinfo. As already discussed in Chapter 1Get Your Qt Feet Wet, Qt Creator will generate some files for us: main.cppMainWindow.hMainWindow.cpp, and MainWindow.ui.

Before diving into the C++ code, we must think about the software's architecture. This project will handle multiple desktop platforms. Thanks to the combination of C++ and Qt, most of the source code will be common to all targets. However, to retrieve both the CPU and memory usage from the OS (operating system), we will use some platform-specific code.

To successfully achieve this task, we will use two design patterns:

  • Strategy pattern: This is an interface that describes functionalities (for example, retrieve CPU usage), and specific behaviors (retrieve CPU usage on Windows/Mac OS/Linux) will be performed into subclasses that implement this interface.

  • Singleton pattern: This pattern guarantees...

Transforming SysInfo into a singleton


Promises are made to be kept: we will now transform the SysInfo class into a singleton. C++ offers many ways to implement the singleton design pattern. We will explain one of them here. Open the SysInfo.h file and make the following changes:

class SysInfo 
{ 
public: 
    static SysInfo& instance(); 
    virtual ~SysInfo(); 
 
    virtual void init() = 0; 
    virtual double cpuLoadAverage() = 0; 
    virtual double memoryUsed() = 0; 
 
protected: 
    explicit SysInfo(); 
 
private: 
    SysInfo(const SysInfo& rhs); 
    SysInfo& operator=(const SysInfo& rhs); 
}; 

The singleton must guarantee that there will be only one instance of the class and that this instance will be easily accessible from a single access point.

So the first thing to do is to change the visibility of the constructor to protected. This way, only this class and the child classes will be allowed to call the constructor.

Since only one instance of the object must exist...

Exploring Qt Charts


The core part is ready. It's now time to create a UI for this project, and Qt Charts can help us with this task. Qt Charts is a module that provides a set of easy-to-use chart components, such as line chart, area chart, spline chart, pie chart, and so on.

Qt Charts was previously a commercial-only Qt module. Since Qt 5.7, the module is now included in Qt on GPLv3 license for open source users. If you are stuck on Qt 5.6, you can build the module by yourself from sources. More information can be found at https://github.com/qtproject/qtcharts.

The aim now is to create two Qt widgets, CpuWidget and MemoryWidget, to display nice Qt charts of the CPU and the memory used. These two widgets will share a lot of common tasks, so we will first create an abstract class, SysInfoWidget:

Then the two actual widgets will inherit from the SysInfoWidget class and perform their specific tasks.

Create a new C++ class called SysInfoWidget with QWidget as a base class. Some enhancements must...

CpuWidget using QCharts


Now that the base class SysInfoWidget is ready, let's implement its first child class: CpuWidget. We will now use the Qt Charts API to display a good-looking widget. The average CPU load will be displayed in a pie graph with a hole in the center, like a partly eaten donut where the eaten part is the percentage of the CPU used. The first step is to add a new C++ class named CpuWidget and make it inherit SysInfoWidget:

#include "SysInfoWidget.h" 
 
class CpuWidget : public SysInfoWidget 
{ 
public: 
    explicit CpuWidget(QWidget* parent = 0); 
}; 

In the constructor, the only parameter needed is a QWidget* parent. Since we provided default values for the startDelayMs and updateSeriesDelayMs variables in SysInfoWidget class, we get the best possible behavior; there is no need to remember it when subclassing SysInfoWidget, but it is still easy to override it if need be.

The next step is to override the updateSeries() function from the SysInfoWidget class and start using...

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

#include "MemoryWidget.h" 
#include <QtCharts/QAreaSeries> 
 
using namespace QtCharts; 
 
const int CHART_X_RANGE_COUNT = 50; 
const int CHART_X_RANGE_MAX = CHART_X_RANGE_COUNT...
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Key benefits

  • Unleash the power of Qt 5 with C++14
  • Integrate useful third-party libraries such as OpenCV
  • Package and deploy your application on multiple platforms

Description

Qt 5.7 is an application development framework that provides a great user experience and develops full-capability applications with Qt Widgets, QML, and even Qt 3D. This book will address challenges in successfully developing cross-platform applications with the Qt framework. Cross-platform development needs a well-organized project. Using this book, you will have a better understanding of the Qt framework and the tools to resolve serious issues such as linking, debugging, and multithreading. Your journey will start with the new Qt 5 features. Then you will explore different platforms and learn to tame them. Every chapter along the way is a logical step that you must take to master Qt. The journey will end in an application that has been tested and is ready to be shipped.

Who is this book for?

This book will appeal to developers and programmers who would like to build GUI-based applications. Knowledge of C++ is necessary and the basics of Qt would be helpful.

What you will learn

  • Create stunning UIs with Qt Widget and Qt Quick
  • Develop powerful, cross-platform applications with the Qt framework
  • Design GUIs with the Qt Designer and build a library in it for UI preview
  • Handle user interaction with the Qt signal/slot mechanism in C++
  • Prepare a cross-platform project to host a third-party library
  • Build a Qt application using the OpenCV API
  • Use the Qt Animation framework to display stunning effects
  • Deploy mobile apps with Qt and embedded platforms
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Length: 526 pages
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Language : English
ISBN-13 : 9781786467126
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Table of Contents

14 Chapters
1. Get Your Qt Feet Wet Chevron down icon Chevron up icon
2. Discovering QMake Secrets Chevron down icon Chevron up icon
3. Dividing Your Project and Ruling Your Code Chevron down icon Chevron up icon
4. Conquering the Desktop UI Chevron down icon Chevron up icon
5. Dominating the Mobile UI Chevron down icon Chevron up icon
6. Even Qt Deserves a Slice of Raspberry Pi Chevron down icon Chevron up icon
7. Third-Party Libraries Without a Headache Chevron down icon Chevron up icon
8. Animations - Its Alive, Alive! Chevron down icon Chevron up icon
9. Keeping Your Sanity with Multithreading Chevron down icon Chevron up icon
10. Need IPC? Get Your Minions to Work Chevron down icon Chevron up icon
11. Having Fun with Serialization Chevron down icon Chevron up icon
12. You Shall (Not) Pass with QTest Chevron down icon Chevron up icon
13. All Packed and Ready to Deploy Chevron down icon Chevron up icon
14. Qt Hat Tips and Tricks Chevron down icon Chevron up icon

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lfxciii Dec 21, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book helped me alot. They also have a udemy course which very helpful. These guys need to create more books, they have excellent understanding and good at transfering their knowledge the reader
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thought Jan 10, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Sometimes I need help, you should help sometimes dude, I am in a chapter 6 I have a problem with configuring Qt for raspberry or discovering Qt3D there are none explanation to create Apple.qml. Is it with QML File(Qt Quick 2)?
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Mahamadou Diakite Aug 08, 2017
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This a great book for learning Qt framework!I learned a lot from it.
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Paulo E. Jun 20, 2017
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Un très bon livre, bien expliqué, beaucoup d'exemples. Je le recommande. Soit pour des initiés, soit pour les plus expérimentés.
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Cliente Amazon Mar 25, 2017
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Anche se il testo è stato ripreso da qt5 qb quanto basta che tratta le stesse cose mi è risultato utile per comprendere l'ambiente di programmazione.
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