DataBase.setHostName(name_server);
        DataBase.setPort(port_server);
        DataBase.setDatabaseName(name_base);
        DataBase.setUserName(name_user);
        DataBase.setPassword(pass_user);

        bool connected = DataBase.open();

le_filter->setText(QChar(8592));

if (myListWidget.selectedItems().isEmpty())
        qDebug() << "ITEMS NOT SELECTED";

if (myListWidget.currentIndex().isValid())
        qDebug() << "ITEMS SELECTED";

int MainWindow::clamp(int val, int min, int max)
{
    return val>max?max:val<min?min:val;
}

bool HistogramWidget::eventFilter(QObject *watched, QEvent *event)
{
   if (watched != histogramChart)
       return false;

    if (event->type() == QEvent::MouseMove)  {
        QMessageBox::information(this, "", "");
        histogramChart->setTitle(QString::number(sum++));
        return true;
    }

    return false;
}