QGraphicsWidget drag&drop problem

I've got QMainWindow, QGraphicsScene, QPushButton.
The problem is drag&drop only works for QPushButtons which are in QMainWindow, not for QPushButtons in QGraphicsScene.
Any hints?
Maybe i should to something with QGraphicsProxyWidget and dragEnterEvent(QGraphicsSceneDragDropEvent * event), but how?

Here is my code:

Code:

---

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QGraphicsScene* scene = new QGraphicsScene;
    QGraphicsWidget *textEdit = scene->addWidget(new QTextEdit("textedit"));
    QGraphicsWidget *pushButton1 = scene->addWidget(new QPushButton("pushbutton1"));
    QGraphicsWidget *pushButton2 = scene->addWidget(new QPushButton("pushbutton2"));
    QGraphicsWidget *pushButton3 = scene->addWidget(new myGraphicsWidget(0));
    QGraphicsWidget *pushButton4 = scene->addWidget(new myGraphicsWidget(0));
    pushButton4->setAcceptDrops(true);
 
    QGraphicsLinearLayout *layout = new QGraphicsLinearLayout(Qt::Vertical);
 
    layout->addItem(textEdit);
    layout->addItem(pushButton1);
    layout->addItem(pushButton2);
    layout->addItem(pushButton3);
    layout->addItem(pushButton4);
 
    QGraphicsWidget *form = new QGraphicsWidget;
    form->setLayout(layout);
    scene->addItem(form);
 
    QGraphicsView *view = new QGraphicsView(this);
    view->setScene(scene);
    view->setAcceptDrops(true);
 
    QVBoxLayout* layoucik = new QVBoxLayout();
    layoucik->addWidget(new myGraphicsWidget(0));
    layoucik->addWidget(new myGraphicsWidget(0));
    layoucik->addWidget(view);
 
    QWidget* widget = new QWidget;
    widget->setLayout(layoucik);
 
    this->setCentralWidget(widget);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}

---

and

Code:

---

#include "mygraphicswidget.h"
#include <QDrag>
#include <QMimeData>
 
 
myGraphicsWidget::myGraphicsWidget(QWidget* parent) : QPushButton("test", parent)
{
    setAcceptDrops(true);
}
 
void myGraphicsWidget::mousePressEvent(QMouseEvent *event)
{
    QPoint hotSpot = event->pos();
    QMimeData *mimeData = new QMimeData;
    mimeData->setText("aaabbcc");
 
    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);
    drag->setHotSpot(hotSpot);
 
    Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
}
 
void myGraphicsWidget::mouseMoveEvent(QMouseEvent *event)
{
 
}
 
void myGraphicsWidget::dragEnterEvent(QDragEnterEvent *event)
{
    if (event->mimeData()->hasText())
    {
        event->accept();
    }
}
 
 
void myGraphicsWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasText())
    {
        this->setText("aaa"+event->mimeData()->text());
    }
}

---

regards,
DizL