Hi,

i'm working on a windows application, where in a dialog i query some data from Postgres, and manually show the output in a table widget.

Qt Code: 
  1. m_ui->tableWidget->setRowCount(joinedData.count());
  2.     for(int i=0; i<joinedData.count(); i++) //for each row
  3.     {
  4.             m_ui->tableWidget->setItem(i, 0, new QTableWidgetItem(joinedData[i].bobin.referenceNumber));
  5.             m_ui->tableWidget->setItem(i, 1, new QTableWidgetItem(QString::number(joinedData[i].bobin.width)));
  6.             m_ui->tableWidget->setItem(i, 2, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getHole())));
  7.             m_ui->tableWidget->setItem(i, 3, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getLessThanZeroFive())));
  8.             m_ui->tableWidget->setItem(i, 4, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getZeroFive_to_zeroSeven())));
  9.             m_ui->tableWidget->setItem(i, 5, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getZeroFive_to_zeroSeven_repetitive())));
  10.             m_ui->tableWidget->setItem(i, 6, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getZeroSeven_to_Three())));
  11.             m_ui->tableWidget->setItem(i, 7, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getThree_to_five())));
  12.             m_ui->tableWidget->setItem(i, 8, new QTableWidgetItem(QString::number(joinedData[i].tolerance.getMoreThanFive())));
  13.      }
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Also, based on row and column information, i paint some of these tablewidgetitems to some colors, but i don't think it's relevant.

I reimplemented the QDialog's contextMenuEvent, to obtain the right clicked tableWidgetItem's row and column coordinates:

(BobinFlanView is custom class derived from QDialog)
Qt Code: 
  1. void BobinFlanView::contextMenuEvent(QContextMenuEvent *event)
  2.     {
  3.         QMenu menu(m_ui->tableWidget);
  4.         //standard actions
  5.         menu.addAction(this->markInactiveAction);
  6.         menu.addAction(this->markActiveAction);
  7.         menu.addSeparator();
  8.         menu.addAction(this->exportAction);
  9.         menu.addAction(this->exportAllAction);
  10.  
  11.         //obtain the rightClickedItem
  12.         QTableWidgetItem* clickedItem = m_ui->tableWidget->itemAt(m_ui->tableWidget->mapFromGlobal(event->globalPos()));
  13.  
  14.  
  15.  
  16.         // if it's a colored one, add some more actions
  17.         if (clickedItem && clickedItem->column()>1 && clickedItem->row()>0)
  18.         {
  19.             //this is a property, i'm keeping this for a later use
  20.             this->lastRightClickedItem = clickedItem; 
  21.             //debug purpose:
  22.             QMessageBox::information(this, "", QString("clickedItem = %1, %2").arg(clickedItem->row()).arg(clickedItem->column()));
  23.             QMessageBox::information(this, "", QString("globalClick = %1, %2\ntransformedPos = %3, %4").arg(event->globalX()).arg(event->globalY())
  24.                                      .arg(m_ui->tableWidget->mapFromGlobal(event->globalPos()).x()).arg(m_ui->tableWidget->mapFromGlobal(event->globalPos()).y()));
  25.  
  26.             menu.addSeparator();
  27.  
  28.             menu.addAction(this->changeSelectedToleranceToUygun);
  29.             menu.addAction(this->changeSelectedToleranceToUyar);
  30.             menu.addAction(this->changeSelectedToleranceToDurdurUyar);
  31.  
  32.             //... some other irrevelant 'enable/disable' activities
  33.  
  34.         menu.exec(event->globalPos());
  35.     }
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The problem is, when i right click on the same item i get the same global coordinates, but randomly different row-column information. For instance, the global pos is exactly 600,230 but row-column pair is randomly (5,3) and (4,3). I mean, what?!

Also, when i click to an item from the last to rows (later than 13, i guess) will never go into condition "if (clickedItem && clickedItem->column()>1 && clickedItem->row()>0)", i think it's mainly because 'clickedItem' is null.

I'll be more than glad to share any more information, or even the full cpp-h-ui trio in order to get help.

Thanks a lot.