Book Image

Application Development with Qt Creator - Third Edition

By : Lee Zhi Eng, Ray Rischpater
Book Image

Application Development with Qt Creator - Third Edition

By: Lee Zhi Eng, Ray Rischpater

Overview of this book

Qt is a powerful development framework that serves as a complete toolset for building cross-platform applications, helping you reduce development time and improve productivity. Completely revised and updated to cover C++17 and the latest developments in Qt 5.12, this comprehensive guide is the third edition of Application Development with Qt Creator. You'll start by designing a user interface using Qt Designer and learn how to instantiate custom messages, forms, and dialogues. You'll then understand Qt's support for multithreading, a key tool for making applications responsive, and the use of Qt's Model-View-Controller (MVC) to display data and content. As you advance, you'll learn to draw images on screen using Graphics View Framework and create custom widgets that interoperate with Qt Widgets. This Qt programming book takes you through Qt Creator's latest features, such as Qt Quick Controls 2, enhanced CMake support, a new graphical editor for SCXML, and a model editor. You'll even work with multimedia and sensors using Qt Quick, and finally develop applications for mobile, IoT, and embedded devices using Qt Creator. By the end of this Qt book, you'll be able to create your own cross-platform applications from scratch using Qt Creator and the C++ programming language.
Table of Contents (19 chapters)
1
Section 1: The Basics
7
Section 2: Advanced Features
12
Section 3: Practical Matters

Determining device location

Many devices support position determination, either through hardware such as a Global Positioning System (GPS) receiver or through network resources such as Internet Protocol (IP) geolocation. Similar to the other sensor support, this facility was introduced to Qt in Qt 4.x through the Qt Mobility module and is now supported through the Qt Positioning module. It's supported on many mobile devices, including Android.

To use the Qt Positioning module, you need to include the positioning keyword in your .pro file, as follows:

QT += quick network positioning 

The Qt Positioning module provides three types of positioning; you can access these by importing the QtPositioning module:

  • PositionSource: This provides position updates at a specified rate, emitting the positionChanged signal when position updates are available.
  • Position: In the slot that you...