Qt, Добавить слайдер в QGraphicsItem, C++

#ifndef QSCROLLABLELABEL_H
#define QSCROLLABLELABEL_H

#include <QtWidgets/QtWidgets>

class QScrollableLabel : public QWidget {
    Q_OBJECT

public:
    explicit QScrollableLabel(QString text, QWidget *parent = 0);

protected:
    QVBoxLayout *layout;
    QScrollArea *scrollArea;
    QLabel *label;

public slots:
    void setText(QString text);

signals:
    void textChanged(QString);
};

#endif // QSCROLLABLELABEL_H

#include "QScrollableLabel.h"

QScrollableLabel::QScrollableLabel(QString text, QWidget *parent) : QWidget(parent) {
    layout = new QVBoxLayout(this);
    layout->setSpacing(0);
    layout->setMargin(0);
    scrollArea = new QScrollArea(this);
    scrollArea->setFrameStyle(0);
    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    layout->addWidget(scrollArea);
    label = new QLabel(this);
    label->setText(text);
    scrollArea->setWidget(label);
}

void QScrollableLabel::setText(QString text) {
    label->setText(text);
    emit textChanged(text);
}

#include <QApplication>
#include <QtWidgets/QGraphicsScene>
#include <QtWidgets/QGraphicsView>
#include <QtWidgets/QSlider>
#include "QScrollableLabel.h"

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QGraphicsScene scene(0, 0, 640, 480);
    QScrollableLabel *scrollableLabel = new QScrollableLabel("I love Qt. I love Qt. I love Qt. I love Qt. I love Qt. I love Qt.");
    scrollableLabel->resize(100, 40);
    QGraphicsProxyWidget *proxyWidget = scene.addWidget(scrollableLabel);
    proxyWidget->setRotation(45);
    proxyWidget->setPos(320, 240);
    QGraphicsView view(&scene);
    view.show();

    return app.exec();
}