Drag and Drop QFrame - qt

Question

I've been looking at drag and drop examples and am still puzzled with them. In particular I don't know what to do in mousePressEvent( ) and dropEvent().
I'm following and modifying example which drags and drops QLabel.
Here is what I think mousePressEvent() should look like for QFrame. I tried it and I can see the frame move but I lose it when I drop it.
void SummaryBar::mousePressEvent(QMouseEvent *event)
{
QFrame *child = static_cast<QFrame*>(childAt(event->pos()));
if (!child)
return;
QPixmap pixmap = QPixmap::grabWidget(child);
QByteArray itemData;
QDataStream dataStream(&itemData, QIODevice::WriteOnly);
dataStream << pixmap << QPoint(event->pos() - child->pos());
QMimeData *mimeData = new QMimeData;
mimeData->setData("application/x-dnditemdata", itemData);
QDrag *drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->setPixmap(pixmap);
drag->setHotSpot(event->pos() - child->pos());
if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction) {
child->close();
} else {
child->show();
}
}
Here is dropEvent(). It obviously does not work... not sure why.
void SummaryBar::dropEvent(QDropEvent *event)
{
if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
QByteArray itemData = event->mimeData()->data("application/x-dnditemdata");
QDataStream dataStream(&itemData, QIODevice::ReadOnly);
QPixmap pixmap;
QPoint offset;
dataStream >> pixmap >> offset;
QFrame *newFrame = new QFrame(this);
//newFrame->setPixmap(pixmap);
newFrame->move(event->pos() - offset);
newFrame->show();
newFrame->setAttribute(Qt::WA_DeleteOnClose);
if (event->source() == this) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else {
event->ignore();
}
}
void SummaryBar::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
if (event->source() == this) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else {
event->ignore();
}
}
I would greatly appreciate any help!!