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)
1
Section 1: The Basics
6
Section 2: Cross-Platform Development
8
Section 3: Advanced Programming, Debugging, and Deployment

Profiling a Qt Quick application using QML Profiler and Flame Graph

QML in Qt 6 takes advantage of graphics processing units (GPUs) and uses hardware acceleration for rendering. This feature makes QML superior to Qt Widgets in terms of performance. However, there can be bottlenecks in your QML code that may impact overall application performance. In this section, we will focus on using the built-in tool to find these bottlenecks. Qt Creator provides seamless integration with multiple tools. The most important tool is QML Profiler. It is provided by Qt and works on all Qt-supported platforms. Other than QML Profiler, Qt Creator also provides third-party tools such as Valgrind, Heob, and Performance Analyzer. You can enable new plugins or remove some plugins from About Plugins…, available under the Help menu.

Let's discuss QML Profiler, which you will be using most of the time to find the bottlenecks in your QML code. The goal of QML Profiler is to help you identify bottlenecks...