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

Exploring custom styles

Qt provides several QStyle subclasses that emulate the styles of the different platforms supported by Qt. These styles are readily available with the Qt GUI module. You can build your own custom styles and export these as plugins. Qt uses QStyle for rendering the Qt widgets to ensure their look and feel, as per native widgets.

On a Unix distribution, you can get a Windows-style UI for your application by running the following command:

$./helloworld -style windows

You can set a style on an individual widget using the QWidget::setStyle() method.

Creating a custom style

You can customize the look and feel of your GUI by creating a custom style. There are two different approaches to creating a custom style. In a static approach, you can subclass the QStyle class and reimplement virtual functions to deliver the desired behavior, or rewrite the QStyle class from scratch. QCommonStyle is generally used as a base class instead of QStyle. In a dynamic...