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Learn Qt 5
Learn Qt 5

Learn Qt 5: Build modern, responsive cross-platform desktop applications with Qt, C++, and QML

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Learn Qt 5

Project Structure

In this chapter, we will create a new multiproject solution that will be the foundation of our example application. We will apply a Model View Controller pattern, separating the user interface and business logic. We will also introduce Qt’s unit testing framework—QtTest—and demonstrate how to integrate it into our solution. We will cover these things in this chapter:

  • Projects, MVC, and unit testing
  • Creating a library project
  • Creating a unit tests project
  • Creating a user interface project
  • Mastering MVC
  • The QObject base class
  • QML
  • Controlling project output

Projects, MVC, and unit testing

The scratchpad application we built in the previous chapter is a Qt project, represented by a .pro file. In a business environment, technical solutions are generally developed as part of company initiatives, and these initiatives are generally also called projects. To try and minimize confusion (and the number of times the word project appears!), we’ll use project to mean a Qt project defined by a .pro file and the word initiative to refer to projects in the business sense.

The initiative we will work on will be a generic client management system. It will be something that can be tweaked and re purposed for multiple applications—for a supplier managing customers, a health service managing patients, and so on. It will perform common tasks found over and over in real-world Line of Business (LOB) applications, principally adding, editing...

Mastering MVC

Now that our solution structure is in place, we’ll get started on the MVC implementation. As you’ll see, it is very minimal and incredibly easy to set up.

First, expand cm-ui > Resources > views.qrc > / > views, right-click on main.qml, select Rename, and rename the file as MasterView.qml. If you get a message about project editing, just select Yes to continue anyway:

If you do get the error message, the file will still appear as main.qml in the Projects pane, but the file will have been renamed in the filesystem.

Next, edit views.qrc (right-click on it and select Open With > Plain Text Editor). Replace the content as follows:

<RCC>
    <qresource prefix="/views">
        <file alias="MasterView.qml">views/MasterView.qml</file>
    </qresource>
</RCC>

If you recall how we load this...

Summary

In this chapter, we took our project creation skills up to the next level, and our solution is now starting to take shape. We implemented an MVC pattern and bridged the gap between our UI and business logic projects. We dabbled with our first bit of QML and took a look at the cornerstone of the Qt framework, QObject.

We removed all those unsightly build-cm… folders, flexed our qmake muscles, and took control of where all of our files go. All binaries are now placed in the cm/binaries folder, organized by platform, compiler, processor architecture, and build configuration. All temporary build artifacts that aren’t required by the end user are now hidden away. We can freely switch kits and build configurations, and have our output automatically rerouted to the correct location.

In Chapter 3, User Interface, we will design our UI and get stuck in some more QML...

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Key benefits

  • • A practical guide on the fundamentals of application development with QT 5
  • • Learn to write scalable, robust and adaptable C++ code with QT
  • • Deploy your application on different platforms such as Windows, Mac OS, and Linux

Description

Qt is a mature and powerful framework for delivering sophisticated applications across a multitude of platforms. It has a rich history in the Linux world, is widely used in embedded devices, and has made great strides in the Mobile arena over the past few years. However, in the Microsoft Windows and Apple Mac OS X worlds, the dominance of C#/.NET and Objective-C/Cocoa means that Qt is often overlooked. This book demonstrates the power and flexibility of the Qt framework for desktop application development and shows how you can write your application once and deploy it to multiple operating systems. Build a complete real-world line of business (LOB) solution from scratch, with distinct C++ library, QML user interface, and QtTest-driven unit-test projects. This is a suite of essential techniques that cover the core requirements for most LOB applications and will empower you to progress from a blank page to shipped application.

Who is this book for?

This book is for application developers who want a powerful and flexible framework to create modern, responsive applications on Microsoft Windows, Apple Mac OS X, and Linux desktop platforms. You should be comfortable with C++ but no prior knowledge of Qt or QML is required.

What you will learn

  • · Install and configure the Qt Framework and Qt Creator IDE
  • · Create a new multi-project solution from scratch and control every aspect of it with QMake
  • · Implement a rich user interface with QML
  • · Learn the fundamentals of QtTest and how to integrate unit testing
  • · Build self-aware data entities that can serialize themselves to and from JSON
  • · Manage data persistence with SQLite and CRUD operations
  • · Reach out to the internet and consume an RSS feed
  • · Produce application packages for distribution to other users

Product Details

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Publication date : Feb 09, 2018
Length: 346 pages
Edition : 1st
Language : English
ISBN-13 : 9781788473682
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Product Details

Publication date : Feb 09, 2018
Length: 346 pages
Edition : 1st
Language : English
ISBN-13 : 9781788473682
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Tools :

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Table of Contents

10 Chapters
Hello Qt Chevron down icon Chevron up icon
Project Structure Chevron down icon Chevron up icon
User Interface Chevron down icon Chevron up icon
Style Chevron down icon Chevron up icon
Data Chevron down icon Chevron up icon
Unit Testing Chevron down icon Chevron up icon
Persistence Chevron down icon Chevron up icon
Web Requests Chevron down icon Chevron up icon
Wrapping Up Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Rating distribution
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(9 Ratings)
5 star 66.7%
4 star 0%
3 star 11.1%
2 star 11.1%
1 star 11.1%
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SXX Mar 21, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is an extremely well written Qt 5 book. It does NOT cover C++, but serves as a pedagogical guide to help you off the ground to start Qt programming using QML and a illustrative sample project from the beginning to the end. It is not exhaustive, but includes all the necessary points you would need to get a jump start.The author writes really well. Beyond the technical contents, the writing itself is very enjoyable to read. The book itself is also a very good example of what technical writing should be.
Amazon Verified review Amazon
PottyWilson Oct 24, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Following the author's explanations and the code examples provided from the website, it is hard to get lost in this book. The formula of concept->plan->code->explanation is well done here, and the code ran smoothly throughout the book. Halfway through chapter 5 I felt confident enough to "split" from the book example of a client management system and create a system for inputting CCG matches. While these two systems are very similar, all the differences I encountered were remedied by the author's in-depth explanations of the underlying Qt concepts.The only time my program majorly blew up was during the object factory part of chapter 9. The primary way I solved it was by religiously following the code examples. For this though, I blame my lackluster C++ skills. I also had difficulty getting the RSS feed to work properly on any website that wasn't the book example one.TLDR; Well-written book for learning Qt framework -- especially QML. Shore up on your C++ skills. Follow provided code examples if you get really stuck.
Amazon Verified review Amazon
Gary O'Connor Sep 26, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I have been a programmer in the Microsoft world for a long time and have been wondering about going over to the other side. This book made the conversion super easy and I think I am going to stay with it.I am delightedFor anyone who has some experience with other methods, this book is super easy to follow and you'll be a C++ programmer in no time at all.
Amazon Verified review Amazon
Caglar Apr 30, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very good book for those, who would like to make UI Applications using Qt. You dont need to have previous knowledge about QML, however definetely have to have some Qt and C++ techniques. You start to develop an together with author step by step. The first four chapter makes a very good introduction to QML. Then you start dealing with data with data, JSON Serialization and saving them into SQL. If you have couple of years experience with Qt, I suggest it.
Amazon Verified review Amazon
D. Dion Dec 09, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you wanna dabble with Qt Quick (QML), then this book is a MUST!I doesn't cover Qt Widgets at all, and that's all good! I wanted a book focusing on Qt Quick (QML) and I found it!So many valuable tips and tricks! The project you build throughout the book is sooooooo good. You'll learn A LOT!Covers QML <-> C++ integration, building libraries, Qt Testing, and so much more.Worth every penny!
Amazon Verified review Amazon
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