Getting the value of a QComboBox inside a QTreeWidget

[pcheng]

I created a QTreeWidget and assigned a column as a combobox using the code in a function AddRoot shown below:

combo_box = new QComboBox();
    combo_box->addItem("0");
    combo_box->addItem("0.5");
    combo_box->addItem("1", QVariant(1));
    combo_box->addItem("2", 2);
    combo_box->addItem("3", 3);
    combo_box->addItem("4");
    combo_box->addItem("5");
    combo_box->addItem("6");
    combo_box->addItem("7");
    combo_box->addItem("8");
    combo_box->addItem("9");
    combo_box->addItem("10");
    combo_box->addItem("11");
    combo_box->addItem("12");
    combo_box->addItem("13");
    combo_box->addItem("14");
    combo_box->addItem("15");
    combo_box->addItem("16");
 
    connect(combo_box, SIGNAL(currentIndexChanged(int)), this, SLOT(planQuantity()));
 
    ui->treeWidget->setItemWidget(itm, 7, combo_box);

combo_box = new QComboBox();
    combo_box->addItem("0");
    combo_box->addItem("0.5");
    combo_box->addItem("1", QVariant(1));
    combo_box->addItem("2", 2);
    combo_box->addItem("3", 3);
    combo_box->addItem("4");
    combo_box->addItem("5");
    combo_box->addItem("6");
    combo_box->addItem("7");
    combo_box->addItem("8");
    combo_box->addItem("9");
    combo_box->addItem("10");
    combo_box->addItem("11");
    combo_box->addItem("12");
    combo_box->addItem("13");
    combo_box->addItem("14");
    combo_box->addItem("15");
    combo_box->addItem("16");

    connect(combo_box, SIGNAL(currentIndexChanged(int)), this, SLOT(planQuantity()));

    ui->treeWidget->setItemWidget(itm, 7, combo_box);

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The combobox shows up nicely and I can see the values I set. The signal also works since I get to planQuantity everytime I change a value.

The problem is how to get the value from the QTreeWidget. I have the following code in planQuantity to add up all the values of the comboboxes in the column.

void PlanDialog::planQuantity()
{
    // Calculate the total plan quantity
    float quantity = 0.0;
    for (int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
    {
        QTreeWidgetItem *item = ui->treeWidget->topLevelItem(i);
        quantity += item->text(7).toFloat();
    }
 
    ui->planQuantityLineEdit->setText(QString("%1").arg(quantity));
}

void PlanDialog::planQuantity()
{
    // Calculate the total plan quantity
    float quantity = 0.0;
    for (int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
    {
        QTreeWidgetItem *item = ui->treeWidget->topLevelItem(i);
        quantity += item->text(7).toFloat();
    }

    ui->planQuantityLineEdit->setText(QString("%1").arg(quantity));
}

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But the result is always 0. Nothing is returned from the item->text(7).toFloat(). 7 is the column where the combobox resides.

Could you please help me identify the problem?

Thanks,

Pericles

[pcheng]

Any ideas on how I can access my combobox value inserted in the qtreewidget?

Pericles

[pcheng]

I changed the widget to a QDoubleSpinBox which makes it easier to handle the values since I only want decimals at 0.5 steps.

QDoubleSpinBox *quantitySpinBox = new QDoubleSpinBox();
    quantitySpinBox->setDecimals(1);
    quantitySpinBox->setSingleStep(0.5);
    ui->treeWidget->setItemWidget(itm, 7, quantitySpinBox);
 
    connect(quantitySpinBox, SIGNAL(valueChanged(double)), this, SLOT(planQuantity()));

QDoubleSpinBox *quantitySpinBox = new QDoubleSpinBox();
    quantitySpinBox->setDecimals(1);
    quantitySpinBox->setSingleStep(0.5);
    ui->treeWidget->setItemWidget(itm, 7, quantitySpinBox);

    connect(quantitySpinBox, SIGNAL(valueChanged(double)), this, SLOT(planQuantity()));

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But again when I try to access the value with the following code it does not return anything.

for (int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
    {
        QTreeWidgetItem *item = ui->treeWidget->topLevelItem(i);
        qDebug() << item->data(7, Qt::DisplayRole).toFloat();
        quantity += item->text(7).toFloat();
    }

for (int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
    {
        QTreeWidgetItem *item = ui->treeWidget->topLevelItem(i);
        qDebug() << item->data(7, Qt::DisplayRole).toFloat();
        quantity += item->text(7).toFloat();
    }

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Any ideas on how to access a value in a widget within the QTreeWidgetItem?

Thanks,

Pericles