Book Image

Hands-On GUI Programming with C++ and Qt5

By : Lee Zhi Eng

Book Image

Hands-On GUI Programming with C++ and Qt5

By: Lee Zhi Eng

Overview of this book

Qt 5, the latest version of Qt, enables you to develop applications with complex user interfaces for multiple targets. It provides you with faster and smarter ways to create modern UIs and applications for multiple platforms. This book will teach you to design and build graphical user interfaces that are functional, appealing, and user-friendly. In the initial part of the book, you will learn what Qt 5 is and what you can do with it. You will explore the Qt Designer, discover the different types of widgets generally used in Qt 5, and then connect your application to the database to perform dynamic operations. Next, you will be introduced to Qt 5 chart which allows you to easily render different types of graphs and charts and incorporate List View Widgets in your application. You will also work with various Qt modules, like QtLocation, QtWebEngine, and the networking module through the course of the book. Finally, we will focus on cross-platform development with QT 5 that enables you to code once and run it everywhere, including mobile platforms. By the end of this book, you will have successfully learned about high-end GUI applications and will be capable of building many more powerful, cross-platform applications.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Introduction to Qt

Introduction to Qt

Downloading and installing Qt

Running our first Hello World Qt program

Qt Widgets and Style Sheets

Qt Widgets and Style Sheets

Introduction to Qt Designer

Basic Qt widgets

Qt Style Sheets

Database Connection

Database Connection

Introducing the MySQL database system

Setting up the MySQL database

Database connection in Qt

Creating our functional login page

Graphs and Charts

Graphs and Charts

Types of charts and graphs in Qt

Implementing charts and graphs

Creating the dashboard page

Item Views and Dialogs

Item Views and Dialogs

Working with item view widgets

Working with dialog boxes

Creating File Selection Dialogs

Image scaling and cropping

Integrating Web Content

Integrating Web Content

Creating your own web browser

Sessions, cookies, and cache

Integrating JavaScript and C++

Map Viewer

Marker and shape display

Obtaining a user's location

Geo Routing Request

Graphics View

Graphics View framework

The Camera Module

The Camera Module

The Qt multimedia module

Connecting to the camera

Capturing a camera image to file

Recording a camera video to file

Instant Messaging

Instant Messaging

The Qt networking module

Creating an instant messaging server

Creating an instant messaging client

Implementing a Graphics Editor

Implementing a Graphics Editor

Drawing vector shapes

Saving vector images to an SVG File

Creating a paint program

Cloud Storage

Setting up the FTP server

Displaying the file list on the list view

Uploading files to the FTP server

Downloading files from the FTP server

Multimedia Viewers

Multimedia Viewers

Revisiting the multimedia module

The image viewer

The music player

The video player

Qt Quick and QML

Qt Quick and QML

Introduction to Qt Quick and QML

Qt Quick widgets and controls

Qt Quick Designer

Qt Quick layouts

Basic QML scripting

Cross-Platform Development

Cross-Platform Development

Understanding compilers

Deploying to PC platforms

Deploying to mobile platforms

Testing and Debugging

Testing and Debugging

Debugging techniques

Debuggers supported by Qt

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Database Connection

In the previous chapter, we learned how to create a login page from scratch. However, it is not functional yet, as the login page is not connected to a database. In this chapter, you will learn how to connect your Qt application to a MySQL (or MariaDB) database that validates login credentials.

In this chapter, we will cover the following topics:

Introducing the MySQL database system
Setting up the MySQL database
SQL commands
Database connection in Qt
Functional login page

We will walk through this chapter in a step-by-step approach to discover the powerful features that come with Qt and allow your application to connect directly to a database without any additional third-party dependencies. Database querying is a huge topic by itself, but we will be able to learn the most basic commands from scratch through examples and practical methods.

Qt supports multiple...