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)

Signals and slots configuration

It is not only possible to connect one signal to one slot, but to connect one signal to more than one slot. This involves repeating the QObject::connect() call and, in each instance, specifying the slot that should be called when a particular signal has been emitted.

Single signal, multiple slots

In this section, we shall concern ourselves with how to connect a single signal to multiple slots.

Examine the following program:

#include <QApplication>
#include <QVBoxLayout>
#include <QLabel>
#include <QDial>
#include <QLCDNumber>
int main(int argc, char *argv[])
QApplication app(argc, argv);
QWidget *window = new QWidget;
QVBoxLayout *layout = new QVBoxLayout;