QML object from C++ class not being destructed? - c++

Question

I've encountered an unexpected behavior (for my point of view) of objects from C++ classes created in QML part of application. An example to be clear:
The starting point is empty QML application.
After that TestEntity class is added:
#ifndef TESTENTITY_H
#define TESTENTITY_H
#include <Qt3DCore>
#include <Qt3DExtras>
class TestEntity : public Qt3DCore::QEntity
{
Q_OBJECT
public:
TestEntity(QNode *parent = nullptr);
~TestEntity();
};
#endif // TESTENTITY_H
#include <QDebug>
#include "testentity.h"
TestEntity::TestEntity(QNode *parent) : Qt3DCore::QEntity(parent)
{
Qt3DExtras::QCuboidMesh *mesh = new Qt3DExtras::QCuboidMesh();
Qt3DCore::QTransform *transform = new Qt3DCore::QTransform();
mesh->setXExtent(12);
mesh->setYExtent(6);
mesh->setZExtent(6);
Qt3DExtras::QDiffuseSpecularMaterial *material = new Qt3DExtras::QDiffuseSpecularMaterial();
material->setAmbient(QColor(Qt::black));
material->setSpecular(QColor(Qt::white));
material->setShininess(4);
this->addComponent(material);
this->addComponent(mesh);
this->addComponent(transform);
}
TestEntity::~TestEntity()
{
qDebug() << "TestEntity destroyed";
}
TestEntity is registered in main.cpp:
qmlRegisterType<TestEntity>("testEntity", 1, 0, "TestEntity");
main.qml:
import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import Qt3D.Core 2.15
import QtQuick.Scene3D 2.15
import Qt3D.Render 2.15
import Qt3D.Extras 2.15
import QtQuick3D.Materials 1.15
import testEntity 1.0
ApplicationWindow {
width: 640
height: 480
visible: true
title: qsTr("Hello World")
Scene3D {
anchors.fill: parent
Entity {
id: rootEntity
RenderSettings {
activeFrameGraph: ForwardRenderer {
camera: camera
clearColor: "transparent"
}
}
Entity {
components: [
PointLight {
color: "#ffffff"
intensity: 0.5
enabled: true
},
Transform {
translation: Qt.vector3d(15, 0, 15)
}
]
}
Camera {
id: camera
projectionType: CameraLens.PerspectiveProjection
fieldOfView: 45
nearPlane : 0.1
farPlane : 150
aspectRatio: 1
position: Qt.vector3d(0.0, -20.0, 20.0)
upVector: Qt.vector3d(0.0, 0.0, 1.0)
viewCenter: Qt.vector3d(0.0, 0.0, 0.0)
}
TestEntity {
id: testEntity
}
}
}
}
Everything works as expected except the destruction of TestEntity object - destructor is not called for some reason...
So the question is what is the proper way to add testEntity in QML, so that it'll be rendered and destroyed without any problems?
Thank in advance!