Book Image

Cross-Platform Development with Qt 6 and Modern C++

By : Nibedit Dey
Book Image

Cross-Platform Development with Qt 6 and Modern C++

By: Nibedit Dey

Overview of this book

Qt is a cross-platform application development framework widely used for developing applications that can run on a wide range of hardware platforms with little to no change in the underlying codebase. If you have basic knowledge of C++ and want to build desktop or mobile applications with a modern graphical user interface (GUI), Qt is the right choice for you. Cross-Platform Development with Qt 6 and Modern C++ helps you understand why Qt is one of the favorite GUI frameworks adopted by industries worldwide, covering the essentials of programming GUI apps across a multitude of platforms using the standard C++17 and Qt 6 features. Starting with the fundamentals of the Qt framework, including the features offered by Qt Creator, this practical guide will show you how to create classic user interfaces using Qt Widgets and touch-friendly user interfaces using Qt Quick. As you advance, you'll explore the Qt Creator IDE for developing applications for multiple desktops as well as for embedded and mobile platforms. You will also learn advanced concepts about signals and slots. Finally, the book takes you through debugging and testing your app with Qt Creator IDE. By the end of this book, you'll be able to build cross-platform applications with a modern GUI along with the speed and power of native apps.
Table of Contents (17 chapters)
Section 1: The Basics
Section 2: Cross-Platform Development
Section 3: Advanced Programming, Debugging, and Deployment

Chapter 6: Signals and Slots

In the previous chapters, we learned how to create GUI applications with Qt Widgets and Qt Quick. But to make our applications usable, we need to add a communication mechanism. The signals and slots mechanism is one of the distinct features of Qt and makes it unique from other frameworks. Signals and slots are implemented through Qt's meta-object system.

In this chapter, you will learn about signals and slots in depth and how they work internally. You will be able to receive notifications from different classes and take the corresponding action.

In this chapter, we will discuss the following topics:

  • Understanding Qt signals and slots
  • The working mechanism of Qt signals and slots
  • Getting to know Qt's property system
  • Understanding signals and the handler event system
  • Understanding events and the event loop
  • Managing events with an event filter
  • Drag and drop

By the end of this chapter, you will be able...