How can I dynamically generate and display QML elements within a Popup window in PyQt5?

Question

I'm currently working on a PyQt5 application that incorporates QML. The application dynamically generates QML code from a configuration file (configuration.yaml). The generated QML code is then sent from Python to QML using signals, and I'm utilizing Qt.createQmlObject() to instantiate QML objects.

The challenge I'm encountering is that this process works seamlessly in the main application, but when attempting the same in a Popup element, the generated QML objects aren't visible on the application interface. Notably, no errors are thrown during execution. Despite verifying that the QML objects are successfully created through debugging, they do not appear on the interface.

Since TestPopup.qml is using MainPopup.qml as its parent and might be causing a problem. I've checked the addElement() function and it is working fine.

Code:

MainPopup.qml

import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import QtQuick.Controls.Material 2.2

Popup {
    id: mainPopup
    
    ...

}

TestPopup.qml

import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import QtQuick.Controls.Material 2.2

MainPopup {
    id: testPopup
    
    function addElement(elementId, elementString) {
        Qt.createQmlObject(elementString, testPopup, elementId)
    }
    
    ...

}

app.py

...

test_qml = """        
    import QtQuick 2.9
    import QtQuick.Window 2.2
    import QtQuick.Controls 2.2
    import QtQuick.Layouts 1.3    
            
    Text {
        text: "Hello World!"
        anchors.centerIn: parent
    }
"""

test_popup = window.findChild(QObject, "testPopup")
test_popup.addElement("testID", test_qml)

...

Answer 1

Since, I was trying to add an element in testPopup which was extending from MainPopup and was not visible on his own. I had to add the new element to MainPopup's contentItem like this:

...

function addElement(elementId, elementString) {
    Qt.createQmlObject(elementString, testPopup.contentItem, elementId)
}

...