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Get the value of a combobox item delegate which is in a table

  • Hello there !
    I have a table which has a column that is a combo box(Qitemdelegate). Now i need to be able to retrieve the chosen value of the combo box when the user presses a certain button.
    I googled all the possible combination but there aren't enough examples of combo boxes as item delegates.


    This is what i use for getting the values from the table model. But if i'm not mistaken, the combo box isn't part of the model.

    Any ideas ?

  • Lifetime Qt Champion

    Normally/often/as far as i know,
    the combo box would be an editor to set the data
    using a combo box (versus typing) so
    the selected value would be part of the model/data?
    User select value. Value stored for that row+col.

    Maybe show your Delegate code?

  • @mrjj I was actually looking that up.
    This is my current Delegate code :

    QtComboboxDelegate::QtComboboxDelegate(QStringList itemList, QObject *parent):itemList(itemList),
    QWidget *QtComboboxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &/* option */,
                                              const QModelIndex &/* index */) const{
      QComboBox* editor = new QComboBox(parent);
      for(unsigned int i = 0; i < itemList.size(); ++i){
      return editor;
    void QtComboboxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const{
      QComboBox *comboBox = static_cast<QComboBox*>(editor);
      int value = index.model()->data(index, Qt::EditRole).toInt();
    void QtComboboxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                       const QModelIndex &index) const
        QComboBox *comboBox = static_cast<QComboBox*>(editor);
        model->setData(index, comboBox->currentIndex(), Qt::EditRole);
    void QtComboboxDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,
                                                const QModelIndex &/* index */) const{

    Similar to the delegate example made for the spinbox.

    My current thought is to create a getComboValue() method in this class.
    What is your thoughts ?

  • Lifetime Qt Champion

    @Koukoumaxe said:

    Hi, im still not sure why yo u need to talk to combo box directly. :)
    You call model->setData so after user selected something in combo box,
    that value should be in the model?
    So "the other place" could just get from model?

    QModelIndex index = model->index(row, col, QModelIndex());

  • oh ! so that is what you meant :)
    But then shouldn't my initial way work ?
    (i mean this :



  • Lifetime Qt Champion

    In theory yes, even its hard to say what
    ui->tblPricelist->model()->index(results.size(),2) becomes.

    But Im wondering if u need a emit DataChanged in setModelData but
    as far as i know would only affect the view and the model should have
    the combo box value.
    If you single step, the model->setData(index, comboBox->currentIndex()
    does set the index you are after?

  • Well, your replies made me wonder enough to find where my mistake is !
    It doesn't have to do with the code mentioned above.
    That statement indeed gets the value from the Model.

    The problem is created because i add to the model in two different methods.
    That causes some logical errors at what the current index is e.t.c

    Therefore my problem isn't relevant to my initial question. Should i close the thread as SOLVED ?

  • Lifetime Qt Champion

    Yes please do. Thank you

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