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

Handling mouse and touch events

QML provides excellent support for mouse and touch events through input handlers that let QML applications handle mouse and touch events. QML types such as MouseArea, MultiPointTouchArea, and TapHandler are used to detect mouse and touch events. We will have a look at these QML types in the following section.


MouseArea is an invisible item that is used with a visible item such as Item or Rectangle in order to provide mouse and touch handling events for that item. MouseArea receives mouse events within the defined area of Item. You can define this area by anchoring MouseArea to its parent's area using the anchors.fill property. If you set the visible property to false, then the mouse area becomes transparent to mouse events.

Let's look at how to use MouseArea in the following example:

import QtQuick
import QtQuick.Window
Window {
    width: 640; height: 480
    visible: true