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Qt5 C++ GUI
Programming
Cookbook
Use Qt5 to design and build a graphical user interface
that is functional, appealing, and user-friendly for your
software application
Lee Zhi Eng
BIRMINGHAM - MUMBAI
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Qt5 C++ GUI Programming Cookbook
Copyright © 2016 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or
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and products mentioned in this book by the appropriate use of capitals. However, Packt
Publishing cannot guarantee the accuracy of this information.
First published: July 2016
Production reference: 1220716
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78328-027-8
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Author Copy Editor
Lee Zhi Eng Safis Editing
Reviewer Project Coordinator
Symeon Huang Izzat Contractor
Commissioning Editor Proofreader
Kartikey Pandey Safis Editing
Acquisition Editor Indexer
Indrajit Das Rekha Nair
Content Development Editor Production Coordinator
Priyanka Mehta Aparna Bhagat
Technical Editors Cover Work
Dhiraj Chandanshive Aparna Bhagat
Ravikiran Pise
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About the Author
Lee Zhi Eng is a 3D artist-turned-programmer who worked in the video game industry as
a game artist, game programmer, and a game programming lecturer. Later, he decided to
take a break from games and ventured into software engineering by co-founding his current
company, Reonyx Tech. Since then, he has been involved in multiple projects that are different
from what he used to do, including geolocation and near-real-time navigation systems, Big
Data analytics, and augmented reality. You can find out more about him at http://www.
zhieng.com, or you can find out about his company at http://www.reonyx.com.
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About the Reviewer
Symeon Huang is an experienced C++ GUI software developer and the author of Qt
5 Blueprints, Packt Publishing. He has finished his master's degree in high performance
computing and has been working as a software engineer in industry.
I'd like to thank Packt Publishing for giving me the opportunity to review this
book. As a reviewer, I've also learnt from this book and I'm sure this book
will be of great use to all readers.
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Table of Contents
Preface v
Chapter 1: Look and Feel Customization 1
Introduction 1
Use style sheets with Qt Designer 2
Basic style sheet customization 6
Creating a login screen using style sheets 11
Using resources in style sheets 19
Customizing properties and sub-controls 23
Styling in QML 27
Exposing QML object pointer to C++ 36
Chapter 2: States and Animations 39
Introduction 39
Property animation in Qt 39
Using easing curves to control property animation 42
Creating an animation group 44
Creating a nested animation group 47
State machines in Qt 50
States, transitions, and animations in QML 53
Animating widget properties using animators 57
Sprite animation 59
Chapter 3: QPainter and 2D Graphics 65
Introduction 65
Drawing basic shapes on screen 66
Exporting shapes to SVG files 69
Coordinate transformation 75
Displaying images on screen 80
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Table of Contents
Applying image effects to graphics 85
Creating a basic paint program 88
2D canvas in QML 94
Chapter 4: OpenGL Implementation 99
Introduction 99
Setting up OpenGL in Qt 100
Hello world! 103
Rendering 2D shapes 106
Render 3D shapes 109
Texturing in OpenGL 114
Lighting and texture filter in OpenGL 118
Moving an object using keyboard controls 122
3D canvas in QML 125
Chapter 5: Building a Touch Screen Application with Qt5 131
Introduction 131
Setting up Qt for mobile applications 132
Designing a basic user interface with QML 138
Touch events 142
Animation in QML 149
Displaying information using Model View 155
Integrating QML and C++ 160
Chapter 6: XML Parsing Made Easy 167
Introduction 167
Processing XML data using stream reader 167
Writing XML data using Stream Writer 173
Processing XML data using the QDomDocument class 176
Writing XML data using the QDomDocument class 179
Using Google's Geocoding API 182
Chapter 7: Conversion Library 187
Introduction 187
Data conversion 187
Image conversion 192
Video conversion 196
Currency conversion 202
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Table of Contents
Chapter 8: Accessing Databases 207
Introduction 207
Connecting to a database 213
Writing basic SQL queries 216
Creating a login screen with Qt 221
Displaying information from a database on a model view 227
Advanced SQL queries 233
Chapter 9: Developing a Web Application Using Qt Web Engine 245
Introduction 245
Introduction to Qt WebEngine 246
WebView and web settings 252
Embedding Google Maps in your project 259
Calling C++ functions from JavaScript 264
Calling JavaScript functions from C++ 271
Index 279
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