Access QComboBox inside QTableWidget

Hi,

I am currently using the QTableWidget, and some of the fields need to have a dropdown menu, so I inserted some QComboBoxes.

Code:

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QComboBox* myComboBox = new QComboBox();
ui->tableWidget->setCellWidget(0,i,myComboBox);

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Now I need to be able to retrieve the QComboBox Index whenever someone changes a dropdown box.


For the normal cells inside my table, I am using:

Code:

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on_tableWidget_cellChanged(int row, int column)
{
       QTableWidgetItem *myItem = ui->tableWidget->item(row,column);
}

---

But this does not tell me when one of the QComboBoxes is manipulated by the user.
Does anyone know how I can setup a function which is called whenever the user changes one of the QComboBoxes?

Connect to currentIndexChanged() signal of QComboBox.

thank you for your quick reply.

I am still a bit confused as to how to connect this, especially since the number of qComboboxes in my table can change.
I am assuming I will need to use this at some point:

Code:

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connect(myComboBox,SIGNAL(currentIndexChanged(QString)) ,info,SLOT(setText(QString)) );

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Also, for the currentItemChanged, what do i need as function input?

Code:

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void gepetto2::on_tableWidget_currentItemChanged(QTableWidgetItem *current, QTableWidgetItem *previous)
{
      current->currentIndex();
}

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Well, it may not look straight forward, but you could store the item's row and col index in each combo box, and retrieve them back in the connected slot.

Here is an working example. Just show() this widget

Code:

---

class TableWidget : public QTableWidget
{
    Q_OBJECT
public:
    enum Id
    {
        Row = Qt::UserRole + 1,
        Col
    };
 
    explicit TableWidget(QWidget * parent = 0)
        : QTableWidget(parent)
    {
        setRowCount(5);
        setColumnCount(2);
 
        for(int row = 0; row < rowCount(); ++row)
        {
            for(int col = 0; col < columnCount(); ++col)
            {
                setItem(row, col, new QTableWidgetItem());
 
                if(col == 0)
                {
                    QComboBox * comboBox = new QComboBox();
                    comboBox->insertItems(0, QString("1,2,3,4,5,6").split(","));
                    comboBox->setItemData(0, row, Row);
                    comboBox->setItemData(0, col, Col);
                    connect(comboBox, SIGNAL(currentIndexChanged(QString)), SLOT(onComboChanged(QString)));
 
                    setCellWidget(row, 0, comboBox);
                }
            }
        }
 
        show();
    }
 
private slots:
    void onComboChanged(const QString & text)
    {
        QComboBox * comboBox = dynamic_cast<QComboBox *>(sender());
 
        if(comboBox)
        {
            int row = comboBox->itemData(0, Row).toInt();
            int col = comboBox->itemData(0, Col).toInt();
 
            item(row, col + 1)->setText(text);
        }
    }
};

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Thank you for your post. I ended up finding a different workaround. Since i only ended up needing the column number, I pass it as setObjectName to the qCombobox, which is somewhat less complicated. ( i know, it's more of a workaround then a solution...


I declare the box as follows before i pass it to the table

Code:

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QComboBox* myComboBox = new QComboBox(); // making a new dropdown box
myComboBox->setObjectName(QString::number(i)); // pass column number as object name
connect(myComboBox, SIGNAL(currentIndexChanged(QString)), SLOT(onComboChanged(QString)));
ui->tableWidget->setCellWidget(0,i,myComboBox); // put box into table

---

Then I call the onComboChanged() (based on what you suggested previously)

Code:

---

void gepetto2::onComboChanged(const QString & text)
{
    qDebug() << "onComboChanged " << text;
    QComboBox * comboBox = dynamic_cast<QComboBox *>(sender()); // load the qcombobox item
 
 
    if(comboBox)
    {
        int column = comboBox->objectName().toInt();  // retrieve column number
        qDebug() << "Dropdown: cols " << column << " : " << comboBox->currentText() << " index " << comboBox->currentIndex();
    }
}

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