Drag and drop in QTreeWidget. How to ?

[Anticross]

I've got QTreeWidget base class with it's member @QTreeWidgetItem * m_draggedItem@
I reimplement some of base methods:
@
void GroupTreeWidget::mousePressEvent(QMouseEvent * event) {

m_draggedItem = itemAt(event->pos());

if (m_draggedItem) {

    m_draggedItem->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsDragEnabled);

    QTreeWidgetItem * parent = m_draggedItem->parent();

    if (parent)
        parent->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsDragEnabled);        
}    

return QTreeWidget::mousePressEvent(event);

}
@
@
void GroupTreeWidget::mouseReleaseEvent(QMouseEvent * event) {

prepareDragItem();
return QTreeWidget::mouseReleaseEvent(event);

}
@
@
void GroupTreeWidget::dropEvent(QDropEvent * event) {

if (m_draggedItem != NULL) {

    QTreeWidgetItem * destItem = itemAt(event->pos());

    if (destItem == NULL) { // some problem here need to revert drag event
        event->ignore();
        prepareDragItem();
        return;
    }

    bool parentIsFolder = destItem->data(0, PROP_FOLDER_ROLE).toBool();  

    if (event->dropAction() != Qt::MoveAction) {
        prepareDragItem();
        event->ignore();
        return;
    }

    if (parentIsFolder == false) {
        prepareDragItem();
        event->ignore();
        return;
    }

    int sourceID = m_draggedItem->data(0, PROP_ID_ROLE).toInt();
    int destID   = destItem->data(0, PROP_ID_ROLE).toInt();

    if (destID == sourceID) {
        prepareDragItem();
        event->ignore();
        return;
    }

    QSharedPointer<Group> child = GET_GROUP_MANAGER().getGroupById(sourceID);

    if (child.isNull()) {
        prepareDragItem();
        event->ignore();
        return; 
    }

    if (destID == child->getProperties().valueI(sxDB::groups::FLD_GROUP_PARENT_ID)) {
       prepareDragItem();
       event->ignore();
       return; 
    }            

    if (child->setParentId(destID) == false) {
        prepareDragItem();
        event->ignore();
        return;
    }
}

prepareDragItem();
return QTreeWidget::dropEvent(event);

}
@
And here is my prepareDragItem function:
@void GroupTreeWidget::prepareDragItem() {

if (m_draggedItem == NULL)
    return;

if (m_draggedItem->data(0, PROP_FOLDER_ROLE).toBool())
    m_draggedItem->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsDragEnabled|Qt::ItemIsDropEnabled);
else
    m_draggedItem->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsDragEnabled);

QTreeWidgetItem * parent = m_draggedItem->parent();

if (parent)
    parent->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsDragEnabled|Qt::ItemIsDropEnabled);

m_draggedItem = NULL;    

}@

And here what i do in ctror:
@setDragEnabled(true);
setAcceptDrops(true);
setDragDropMode(QAbstractItemView::InternalMove);@
Now I have lot of bugs. Firs of all I need to insert only in folders(PROP_FOLDER_ROLE == true), I need to disable drop in item itself and it's parent. And I need to insert only in items not between them. And I need only move action inside this widget. Why do I do this ? - I need to change some data inside my program when I make a drop and block some drops.
1)When I ignoring drop event my item deletes from it's current position - how to fix this ?
2)When I drop Item between two items it's do the same (I need to get QTreeWidgetItem poiter based on some else not event pos()).