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)

Drag and drop

In this section, we shall put together a simple application that can handle drag and drop operations from an external source into an application.

The application is a small text editor. When a text file is dropped into the text area, it will open and insert the contents of that text file into the text area. The status of the window will show the number of characters in the text area, which is an instance of a QTextEdit.

This example application also illustrates a very important point about events. To customize a widget, one has to change the existing behavior of that widget by overriding its event handlers. Signals and slots are not considered when trying to customize widgets (except events).

To begin this project, perform the following steps:

  1. Create a new folder with a name of your choice
  2. Create the main.cpp, mainwindow.cpp, mainwindow.h, dragTextEdit.h, and dragTextEdit...