Qt5: Derive QQuickWidget to get a widget - c++

Question

I try to embed this qml definition:
import QtQuick 2.0
Rectangle {
id: mqldefinition
color: "green"
width: 100
height: 100
Text {
id: text
text: "This is a text!"
font.pointSize: 14
anchors.centerIn: parent
}
}
within a Qt C++-widget:
qmlwidget.h
#include <QQuickWidget>
class QmlWidget
: public QQuickWidget
{
Q_OBJECT
public:
explicit QmlWidget(QWidget *parent = nullptr);
};
qmlwidget.h
#include "qmlwidget.h"
QmlWidget::QmlWidget(QWidget *parent)
: QQuickWidget(parent)
{
resize(100,100);
setSource(QUrl("qrc:/definition.qml"));
}
This widget shall be shown within the MainWindow as partly shown here:
mainwindow.cpp
#include "mainwindow.h"
#include "qmlwidget.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
auto qmlWidget = new QmlWidget(this);
qmlWidget->move(0,0);
}
But it is not shown :(
I found this in SO:
QQuickWidget *view = new QQuickWidget;
view->setSource(QUrl::fromLocalFile("myqmlfile.qml"));
view->show();
but I would like to implement it as derived class :)

Answer 1

One possible solution is to set the QmlWidget as centralWidget.
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QmlWidget *qmlWidget = new QmlWidget;
qmlWidget->setResizeMode(QQuickWidget::SizeRootObjectToView);
setCentralWidget(qmlWidget);
}
Another approach is to use layouts to handle the size of the widget.