Is a QML object type basically a class?

Egn1n3

Hi,
I am trying to understand the concept of "QML object types". The Qt documentation says this about QML object types: A QML object type is a type from which a QML object can be instantiated.
This seems to me that a QML object type is just the same as a class as you instantiate an object from it? Is that a valid statement?
Thanks.

SGaist

Hi,

Not completely. The next sentence in the documentation says QML object types are derived from QtObject, and are provided by QML modules.. So all these objects must be derived from QObject.

dheerendra

in addition what @SGaist said, if you are starting now with Qt/QML & coming from C++ background, you can just treat it like a class from which are creating the object in QML context.

Egn1n3

Thanks @SGaist and @dheerendra. So when you declare an QML Object type like this:

import QtQuick 2.0

Rectangle {
    width: 100
    height: 100
    color: "red"
}

The Rectangle Object type inherits the QObject class. But when will the Rectangle Object type be instantiated then? Or is this done automatically in QML once you declared it?
Thanks.

dheerendra

Here it means to say that QML should create the object of Rectangle. That's it. Object of Rectangle is automatically created once you declare like above in your qml files.

ODБOï

https://qmlbook.github.io/en/ch16/index.html#understanding-the-qml-run-time

Egn1n3

@LeLev Thanks!