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

Qt Code: 
  1. combo_box = new QComboBox();
  2.     combo_box->addItem("0");
  3.     combo_box->addItem("0.5");
  4.     combo_box->addItem("1", QVariant(1));
  5.     combo_box->addItem("2", 2);
  6.     combo_box->addItem("3", 3);
  7.     combo_box->addItem("4");
  8.     combo_box->addItem("5");
  9.     combo_box->addItem("6");
  10.     combo_box->addItem("7");
  11.     combo_box->addItem("8");
  12.     combo_box->addItem("9");
  13.     combo_box->addItem("10");
  14.     combo_box->addItem("11");
  15.     combo_box->addItem("12");
  16.     combo_box->addItem("13");
  17.     combo_box->addItem("14");
  18.     combo_box->addItem("15");
  19.     combo_box->addItem("16");
  20.  
  21.     connect(combo_box, SIGNAL(currentIndexChanged(int)), this, SLOT(planQuantity()));
  22.  
  23.     ui->treeWidget->setItemWidget(itm, 7, combo_box);
To copy to clipboard, switch view to plain text mode 

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.

Qt Code: 
  1. void PlanDialog::planQuantity()
  2. {
  3.     // Calculate the total plan quantity
  4.     float quantity = 0.0;
  5.     for (int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
  6.     {
  7.         QTreeWidgetItem *item = ui->treeWidget->topLevelItem(i);
  8.         quantity += item->text(7).toFloat();
  9.     }
  10.  
  11.     ui->planQuantityLineEdit->setText(QString("%1").arg(quantity));
  12. }
To copy to clipboard, switch view to plain text mode 

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