Qt 5 Blueprints

Symeon Huang

• Verlag: Packt Publishing
• Jahr: 2015
• ISBN:
  9781784390761
• Thema: Computer Science
• Thema: Programming

About This Book

• Develop native graphical applications that can run anywhere with one of the world's best open-source frameworks
• Learn all about signals, slots, models, and views to design a robust structure for your application
• A comprehensive tutorial with step-by-step instructions to help you extend your applications across a wide domain

Who This Book Is For

If you are a programmer looking for a truly cross-platform GUI framework to help you save your time by side-stepping the incompatibility between different platforms and building applications using Qt 5 for multiple targets, then this book is most certainly intended for you. It is assumed that you have a basic programming experience of C++ and fundamental knowledge about Qt.

Qt 5 Blueprints

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Table of Contents

Qt 5 Blueprints

Credits

About the Author

About the Reviewers

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Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Creating Your First Qt Application

Creating a new project

Changing the layout of widgets

Understanding the mechanism of signals and slots

Connecting two signals

Creating a Qt Quick application

Connecting C++ slots to QML signals

Summary

2. Building a Beautiful Cross-platform Clock

Creating a basic digital clock

Tweaking the digital clock

Saving and restoring settings

Building on the Unix platforms

Summary

3. Cooking an RSS Reader with Qt Quick

Understanding model and view

Parsing RSS Feeds by XmlListModel

Tweaking the categories

Utilizing ScrollView

Adding BusyIndicator

Making a frameless window

Debugging QML

Summary

4. Controlling Camera and Taking Photos

Accessing the camera in Qt

Controlling the camera

Displaying errors on the status bar

Permanent widgets in the status bar

Utilizing the menu bar

Using QFileDialog

QML camera

Summary

5. Extending Paint Applications with Plugins

Drawing via QPainter

Writing static plugins

Writing dynamic plugins

Merging plugins and main program projects

Creating a C++ plugin for QML applications

Summary

6. Getting Wired and Managing Downloads

Introducing Qt network programming

Utilizing QNetworkAccessManager

Making use of the progress bar

Writing multithreaded applications

Managing a system network session

Summary

7. Parsing JSON and XML Documents to Use Online APIs

Setting up Qt for Android

Parsing JSON results

Parsing XML results

Building Qt applications for Android

Parsing JSON in QML

Summary

8. Enabling Your Qt Application to Support Other Languages

Internationalization of Qt applications

Translating Qt Widgets applications

Disambiguating identical texts

Changing languages dynamically

Translating Qt Quick applications

Summary

9. Deploying Applications on Other Devices

Releasing Qt applications on Windows

Creating an installer

Packaging Qt applications on Linux

Deploying Qt applications on Android

Summary

10. Don't Panic When You Encounter These Issues

Commonly encountered issues

C++ syntax mistakes

Pointer and memory

Incompatible shared libraries

Doesn't run on Android!

Debugging Qt applications

Debugging Qt Quick applications

Useful resources

Summary

Index

Qt 5 Blueprints

Copyright © 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

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First published: March 2015

Production reference: 1240315

Published by Packt Publishing Ltd.

Livery Place

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ISBN 978-1-78439-461-5

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Credits

Author

Symeon Huang

Reviewers

Lee Zhi Eng

Sudhendu Kumar

Mickael Minarie

Acquisition Editor

Shaon Basu

Content Development Editor

Sriram Neelakantan

Technical Editors

Novina Kewalramani

Shruti Rawool

Copy Editor

Sonia Michelle Cheema

Project Coordinator

Judie Jose

Proofreaders

Simran Bhogal

Safis Editing

Indexer

Rekha Nair

Graphics

Sheetal Aute

Disha Haria

Abhinash Sahu

Production Coordinator

Conidon Miranda

Cover Work

Conidon Miranda

About the Author

Symeon Huang is an amateur developer who's currently doing his master's degree at Trinity College, Dublin. He has been contributing to open source projects for several years. He has worked in various areas, including the maintenance of Linux servers, desktop application development, and image recognition and analysis.

Symeon has always been passionate about cool technology and elegant programming techniques. He has been programming Qt and QML applications for 2 years and has also been developing pure C and C++ programs for many years. Most of the projects he's working on can be found on his GitHub and Gitorious pages.

I would like to thank my family, especially my parents, for supporting me all through this process. I would never have been able to achieve what I have today without their hard work and unconditional love.

I would also like to thank my mentor, Ting Dai, from Southeast University, China, for his teaching. Without the things I have learned from him, I wouldn't have started programming in C++ with Qt. He also taught me a lot about common software development and gave me helpful programming tips.

About the Reviewers

Lee Zhi Eng is a 3D artist-turned-programmer who worked as a game artist and programmer in several local game studios in his native country before becoming a contractor and a part-time lecturer at a local university and teaching game development subjects, particularly those related to Unity Engine and Unreal Engine 4. You can find more information about him at http://www.zhieng.com.

Sudhendu Kumar has been a GNU/Linux user for more than 7 years. Currently, he is a software developer for a networking giant, and in his free time, he also contributes to KDE.

I would like to thank the publishers for giving me the opportunity to review this book. I hope readers find it useful and enjoy reading it and playing around with Qt/Qml applications, not only on desktop devices but also on mobile platforms.

Mickael Minarie is a software developer who graduated from the University of Clermont-Ferrand (bachelor's in embedded systems) and Robert Gordon University, Aberdeen (bachelor's in computer science). He has worked on freelance projects, developing some programs in C++/Qt for embedded systems or in programs linked with photos and videos.

He now lives in France, but he has lived in the UK and Canada for some years.

He is an analog photogra...