class TreeWidgetItem: public QObject,public QTreeWidgetItem
{
    Q_OBJECT

public:
    Plot* p;

public:
    explicit TreeWidgetItem(TreeWidgetItem*parent);
    explicit TreeWidgetItem(QTreeWidget*parent);
    explicit TreeWidgetItem(QTreeWidgetItem*parent);
    ~TreeWidgetItem();

signals:
    void sg_unChecked();
};

connect(items.at(index),SIGNAL(sg_unChecked(TreeWidgetItem*)),this,SLOT(sl_deletePlot(TreeWidgetItem*)));

signals:
    void sg_itemChecked(QTreeWidgetItem*) const;

QMimeData * TreeWidget::mimeData (const QList<QTreeWidgetItem *> items) const
{
    QMimeData *mimeData = new QMimeData();
    QByteArray encodedData;


    foreach (QTreeWidgetItem* item, items)
    {
        qDebug() <<"index = " << fileName_Item->indexOfChild(item);
        qDebug()<<"data = "<<item->data(0,Qt::EditRole);

        emit sg_itemChecked(item);
        encodedData.append(item->data(0,Qt::EditRole).toByteArray());
    }

    mimeData->setData( "application/x-qt-windows-mime;value=\"ComtradeChannel\"", encodedData);
    return mimeData;
}

void Widget::sl_itemChecked(QTreeWidgetItem *item)
{
    item->setCheckState(0,Qt::Checked);
}

void Widget::dropEvent(QDropEvent *event)
{ 
if (event->mimeData()->hasFormat("application/x-qt-windows-mime;value=\"ComtradeChannel\""))
    {
        QByteArray d(event->mimeData()->data("application/x-qt-windows-mime;value=\"ComtradeChannel\""));
        qDebug()<<"d = "<<d;

        connect(tree,SIGNAL(sg_itemChecked(QTreeWidgetItem*)),this,SLOT(sl_itemChecked(QTreeWidgetItem*)));
    }
}

connect(tree,SIGNAL(sg_itemChecked(QTreeWidgetItem*)),static_cast<TreeWidget*>(this),SLOT(sl_itemChecked(QTreeWidgetItem*)));