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

Creating custom widgets

Qt provides ready-to-use essential GUI elements. Qt widgets were not actively developed after Qt Modeling Language (QML) came into existence, so you may require a more specific widget and may want to make it available to others. A custom widget may be a combination of one or more Qt widgets placed together or may be written from scratch. We will create a simple label widget from QLabel as our first custom widget. A custom widget collection can have multiple custom widgets.

Follow these steps to build your first Qt custom widgets library:

  1. To create a new Qt custom widget project in Qt, click on the File menu option on the menu bar or hit Ctrl + N. Alternatively, you can also click on the New Project button located on the Welcome screen. Select the Other Project template and then select Qt Custom Designer Widget, as shown in the following screenshot:

    Figure 3.10 – Creating a custom widget library project

  2. In the next step, you will be asked...