Book Image

Getting Started with Qt 5

By : Benjamin Baka
Book Image

Getting Started with Qt 5

By: Benjamin Baka

Overview of this book

Qt is a cross-platform application framework and widget toolkit that is used to create GUI applications that can run on different hardware and operating systems. The main aim of this book is to introduce Qt to the reader. Through the use of simple examples, we will walk you through building blocks without focusing too much on theory. Qt is a popular tool that can be used for building a variety of applications, such as web browsers, media players such as VLC, and Adobe Photoshop. Following Qt installation and setup, the book dives straight into helping you create your first application. You will be introduced to Widgets, Qt's interface building block, and the many varieties that are available for creating GUIs. Next, Qt's core concept of signals and slots are well illustrated with sufficient examples. The book further teaches you how to create custom widgets, signals and slots, and how to communicate useful information via dialog boxes. To cap everything off, you will be taken through writing applications that can connect to databases in order to persist data. By the end of the book, you should be well equipped to start creating your own Qt applications and confident enough to pick up more advanced Qt techniques and materials to hone your skills.
Table of Contents (8 chapters)

Working with Signals and Slots

Thus far, we have learned how to create applications and display various kinds of widgets. If that were all that GUI applications were made of, that would be the end of the matter. But there is more that we need to do in order to make our applications usable. In this chapter, we will set about the following:

  • Understanding the concept behind signals and slots
  • Learning the different ways to connect signals and slots

GUI toolkits usually provide a means to react to things that occur within an application. Nothing is left to chance. Every tick that happens within the application is registered and taken note of. For example, when you move a window or resize it, the action gets registered, and provided ample code has been written, it will be executed as a reaction to the moving or resizing of the window. For every action that occurs, a number of outcomes...