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)

Using a data model for database access

There are two classes that can be used in accessing the database. These are the QSqlTableModel and QSqlQueryModel classes. The QSqlQueryModel class only provides a read-only model to the database. QSqlTableModel provides both read and write model access to the database.

In application development, you are confronted with the challenge of how to present data and to maintain a relationship between data and presentation (view) such that changes to the data are reflected in the view.

In the early days of the PHP language, data, presentation, and business logic were all jumbled up in one or more scripts. This made debugging and eventual code maintenance a nightmare. This same dilemma does crop up from time to time in language and framework design.

The Model-View-Controller (MVC) approach is an attempt to solve this problem. It recognizes that...