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Thread: Qt: TableWidget’s ItemAt() acting weirdly

  1. 16th October 2009, 15:58 #1
    emredog
    emredog is offline Beginner
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    Default Qt: TableWidget’s ItemAt() acting weirdly

    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.
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  2. 16th October 2009, 16:19 #2
    Lykurg
    Lykurg is offline Guru
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    Default Re: Qt: TableWidget’s ItemAt() acting weirdly

    Quote Originally Posted by emredog View Post
    Qt Code: 
    1. QTableWidgetItem* clickedItem = m_ui->tableWidget->itemAt(m_ui->tableWidget->mapFromGlobal(event->globalPos()));
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    You probably have to add the offset caused by the scrolling of your table widget.
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  3. 19th October 2009, 07:50 #3
    emredog
    emredog is offline Beginner
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    Default Re: Qt: TableWidget’s ItemAt() acting weirdly

    thanks.

    some guy from stackoverflow proposed a better solution, i would like to share it here:

    The problem is that you are trying to map the global position to the table widget position, without considering the scrollable area. To map the global position into something you can pass to itemAt, use
    Qt Code: 
    1. tableWidget->viewport()->mapFromGlobal
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    .
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