Drag 'n Drop QListWidget: no text while dragging if not default drag used

[trallallero]

I have a little problem with DnD using a QListWidget.
I have to create my own QListWidget class (called CListWidget) as I need to implement my own mousePressEvent method.

void CListWidget::mousePressEvent(QMouseEvent *event)
{
	QListWidget::mousePressEvent(event);
 
	if ( currentItem()->text().isEmpty() )
	{
		clearSelection();
		return;
	}
 
	QByteArray itemData;
	QDataStream dataStream(&itemData, QIODevice::WriteOnly);
	dataStream << currentItem()->text();
 
	QMimeData *mimeData = new QMimeData;
	mimeData->setData("application/x-dnditemdata", itemData);
	mimeData->setText(currentItem()->text());
 
	QDrag *drag = new QDrag(this);
	drag->setMimeData(mimeData);
	drag->exec(Qt::CopyAction);
}

void CListWidget::mousePressEvent(QMouseEvent *event)
{
	QListWidget::mousePressEvent(event);

	if ( currentItem()->text().isEmpty() )
	{
		clearSelection();
		return;
	}

	QByteArray itemData;
	QDataStream dataStream(&itemData, QIODevice::WriteOnly);
	dataStream << currentItem()->text();

	QMimeData *mimeData = new QMimeData;
	mimeData->setData("application/x-dnditemdata", itemData);
	mimeData->setText(currentItem()->text());

	QDrag *drag = new QDrag(this);
	drag->setMimeData(mimeData);
	drag->exec(Qt::CopyAction);
}

To copy to clipboard, switch view to plain text mode 

When using this code, I cannot see any text while dragging.
If I comment the code and just enable the drag:

CListWidget::CListWidget(QWidget* parent) : QListWidget(parent)
{
	setDragEnabled(true);
}

CListWidget::CListWidget(QWidget* parent) : QListWidget(parent)
{
	setDragEnabled(true);
}

To copy to clipboard, switch view to plain text mode 

the text of the CListWidget item is shown while dragging.

Why ?

The problem is also that, if I use the QT default drag, I don't have any text in the item dragged.

Thanks for any suggestion


PS: Using Qt version 4.4.0 under Linux Ubuntu 8.04