Qt Quick is another way of creating applications with Qt. You can use it to create a complete application in place of Qt Widgets. The Qt Quick module provides transitions, animations, and visual effects. You can also customize graphical effects with shaders. This module is especially efficient at making software for devices using touchscreens. Qt Quick uses a dedicated language: Qt Modeling Language (QML). It is a declarative language; the syntax is close to the JSON (JavaScript Object Notation) syntax. Furthermore, QML also supports JavaScript expressions inline or in a separate file.

Let's begin with a simple example of a Qt Quick application using QML. Create a new file called main.qml with this code snippet:

import QtQuick 2.5 
import QtQuick.Window 2.2 
 
Window { 
    visible: true 
    width: 640; height: 480 
 
    // A nice red rectangle 
    Rectangle { 
        width: 200; height: 200 
        color: "red" 
    } 
} 

Qt 5 provides a nice tool called...