How to work with signals from QTableWidget cell wi

问题:

I've got a QTableWidget with some columns inside.
Due to my needs I set QComboBox inside some columns and fill them with necessary data.

void settingsDialog::onAddFieldButtonClicked()
{
    fieldsTable->setRowCount(++rowCount);
    combo = new QComboBox();
    combo->addItem(QString("Choose from list..."));
    foreach( int height, heightsAvailable)
        combo->addItem(QString("%1").arg(height));
    fieldsTable->setCellWidget(rowCount-1, 3, combo);
    // etc for other columns ...
}

The quetsion is how to catch signals from this combo boxes if they were changed?
I want to know row and col of changed widget (combo box) and the value which was set.

I've tried all available signals which are mentioned in Qt docs for QTableWidget, but they work only if cell doesn't have widget inside it.
Is there a simple and Qt-way to get what I need?

回答1:

Instead of handling a signal from the table, you can handle currentIndexChanged signal from combo box itself.

QComboBox* combo = new QComboBox();
combo->addItem(QString("Choose from list..."));
combo->addItem(QString("first item"));
combo->setProperty("row", ui->tableWidget->rowCount() - 1);
combo->setProperty("column", 0);
connect(combo, SIGNAL(currentIndexChanged(const QString&)), this, SLOT(OnComboIndexChanged(const QString&)));
ui->tableWidget->setCellWidget(ui->tableWidget->rowCount() - 1, 0, combo);

And in the slot, you can use sender() to identify the combo box which emitted the signal.

void MainWindow::OnComboIndexChanged(const QString& text)
{
    QComboBox* combo = qobject_cast<QComboBox*>(sender());
    if (combo)
    {
        qDebug() << "row: " << combo->property("row").toInt();
        qDebug() << "column: " << combo->property("column").toInt();
    }
}