ui.listWidget_Filelist->setContextMenuPolicy(Qt::CustomContextMenu);

void SonicAttribute::on_listWidget_Filelist_customContextMenuRequested(const QPoint &pos)
{
  QListWidgetItem* curItem = ui.listWidget_Filelist->itemAt(pos);
  if (curItem == NULL)
    return;

  QMenu *popMenu = new QMenu(this);
  QAction *deleteSeed = new QAction(tr("Delete"), this);
  popMenu->addAction(deleteSeed);
  connect(deleteSeed, SIGNAL(triggered()), this, SLOT(deleteSeedSlot()));
  popMenu->exec(QCursor::pos());
  delete popMenu;
  delete deleteSeed;
}