drag&drop from QGraphicsScene to QListWidget

[hakiim35]

Hi, I am developing a desktop applications which is inherited from QMainWindow and contains several widgets such as QDockWidgets, QListWidgets, QPushButtons, etc.
I have a QGraphicsView, which includes a QGraphicsScene containing a graphics item which inherits QGraphicsPixmapItem. The scene centers the main window. I want to drag and drop its content into a QListWidget. When dropped, I want to add the graphic item class' text member to the QListWidget. I have the following nonworking piece of code:
This first part is from my graphics item class:

void myGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
	if (event->button() != Qt::LeftButton) {
		event->ignore();
		return;
	}
 
	setCursor(Qt::ClosedHandCursor);
 
        update();
 
}
 
void myGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{  
	if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton))
		.length() < QApplication::startDragDistance()) {
			return;
	}
 
	QDrag* drag = new QDrag(event->widget());
 
	QMimeData* mime = new QMimeData;
 
	mime->setImageData(this->getImage());
	mime->setText(this->path);
 
	drag->setMimeData(mime);
 
	drag->setPixmap(this->getPixmap().scaled(30, 40));
 
	drag->exec(Qt::CopyAction);
 
	setCursor(Qt::OpenHandCursor);
 
	update();
}
 
 
void myGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    setCursor(Qt::OpenHandCursor);
 
    update();
}

void myGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
	if (event->button() != Qt::LeftButton) {
		event->ignore();
		return;
	}

	setCursor(Qt::ClosedHandCursor);

        update();
   
}

void myGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{  
	if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton))
		.length() < QApplication::startDragDistance()) {
			return;
	}

	QDrag* drag = new QDrag(event->widget());

	QMimeData* mime = new QMimeData;

	mime->setImageData(this->getImage());
	mime->setText(this->path);

	drag->setMimeData(mime);

	drag->setPixmap(this->getPixmap().scaled(30, 40));

	drag->exec(Qt::CopyAction);

	setCursor(Qt::OpenHandCursor);
	
	update();
}


void myGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    setCursor(Qt::OpenHandCursor);

    update();
}

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The second part is from my widget class, which I have created from its ui file. The ui contains a QListWidget and two QPushButton.

class myWidget : public QWidget, public Ui::myWidgetClass
{
	Q_OBJECT
 
public:
	myWidget (QWidget *parent = 0);
	~myWidget ();
 
protected:
	void dragEnterEvent(QDragEnterEvent *event);
	void dragMoveEvent(QDragMoveEvent *event);
	void dropEvent(QDropEvent *event);

class myWidget : public QWidget, public Ui::myWidgetClass
{
	Q_OBJECT

public:
	myWidget (QWidget *parent = 0);
	~myWidget ();

protected:
	void dragEnterEvent(QDragEnterEvent *event);
	void dragMoveEvent(QDragMoveEvent *event);
	void dropEvent(QDropEvent *event);

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myWidget ::myWidget (QWidget *parent)
	: QWidget(parent)
{
	setupUi(this);
	setAcceptDrops(true);
}
 
void myWidget ::dropEvent( QDropEvent *event )
{
	if (event->mimeData()->hasImage() && event->mimeData()->hasText())
	{
		event->acceptProposedAction();
 
		QString absolutePath = ;
                QListWidgetItem item(event->mimeData()->text());
		myListWidget->addItem(&item);
	}
	else
		event->ignore();
}
void ProjectWidget::dragEnterEvent( QDragEnterEvent *event )
{
	event->setDropAction(Qt::CopyAction);
	event->accept();
}
 
void ProjectWidget::dragMoveEvent( QDragMoveEvent *event )
{
	event->setDropAction(Qt::CopyAction);
	event->accept();
}

myWidget ::myWidget (QWidget *parent)
	: QWidget(parent)
{
	setupUi(this);
	setAcceptDrops(true);
}

void myWidget ::dropEvent( QDropEvent *event )
{
	if (event->mimeData()->hasImage() && event->mimeData()->hasText())
	{
		event->acceptProposedAction();

		QString absolutePath = ;
                QListWidgetItem item(event->mimeData()->text());
		myListWidget->addItem(&item);
	}
	else
		event->ignore();
}
void ProjectWidget::dragEnterEvent( QDragEnterEvent *event )
{
	event->setDropAction(Qt::CopyAction);
	event->accept();
}

void ProjectWidget::dragMoveEvent( QDragMoveEvent *event )
{
	event->setDropAction(Qt::CopyAction);
	event->accept();
}

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The problem is, the drag&drop operation never starts. When I double left click(no response when 1 left click) on the graphics item, the cursor changes to Qt::ClosedHandCursor state and keeps the same state while the mouse cursor is on the graphics item(say it is a 400x300 region).
The list widget item, which is the target widget for the drop action, is on the left most part of the app gui.
So the drag&drop always fails. The mouse is in Qt::ClosedHandCursor state when I double click on the image and drag anywhere outside while keeping the left button pressed, but never drops the item on the list widget when I release the button.
What can be the problem?
Thanks in advance.