QDataWidgetMapper and QCombobox

I am using QDataWidgetMapper successfully with QLineEdit and other widgets but it doesn't work with QCombobox.

If I replace the QCombobox by a QLineEdit, it works: the QLineEdit is updated when I select a line in my table view.
If I come back to the QCombobox, it doesn't work: the QCombobox is not updated when I select a line in my table view.

Do you know why ?
Is it normal or is it a bug ?
Do you know a simple workaround ?

Thank you for your help

It's normal. You have to provide a custom delegate for the mapper so that it knows how to convert data between the model and the editor (combobox in this case). As far as I remember there is an article on Qt Quarterly that describes the solution.

Quote:

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Originally Posted by wysota

It's normal. You have to provide a custom delegate for the mapper so that it knows how to convert data between the model and the editor (combobox in this case). As far as I remember there is an article on Qt Quarterly that describes the solution.

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Hi wysota,

With your answer, I found the following page http://doc.trolltech.com/qq/qq21-datawidgetmapper.html and understood that it doesn't work with QComboBox because of QComboBox doesn't have a user property.

I didn't use the delegate solution proposed on the page, I preferred use the following one:
Creation of a new Combo box class with a user property:

Quote:

---

class __attribute__ ((visibility("default"))) SKGComboBox : public KComboBox
{
Q_OBJECT
Q_PROPERTY( QString text READ text WRITE setText USER true)

public:
/**
* Default Constructor
*/
SKGComboBox(QWidget *parent = 0);

/**
* Default Destructor
*/
virtual ~SKGComboBox();

/**
* Get the text for the combo
* @return the text
*/
virtual QString text() const;


/**
* Set the text for the combo
* @param iText the text
*/
virtual void setText (const QString& iText);


};

---

Quote:

---

SKGComboBox::SKGComboBox(QWidget *parent)
: KComboBox(parent)
{
}

SKGComboBox::~SKGComboBox()
{
}

QString SKGComboBox::text() const
{
return currentText();
}

void SKGComboBox::setText (const QString& iText)
{
int pos=findText(iText);
if (pos==-1)
{
pos=0;
insertItem(pos, iText);
}
setCurrentIndex(pos);
}

---

And it works now like for QLineEdit.

Thank you again.

The problem with your solution is that you have to set the list of available choices manually, but that's ok if you're satisfied with it.

I was referring to this article, by the way:
http://doc.trolltech.com/qq/qq21-dat...toofferchoices

I had same problem with http://doc.trolltech.com/qq/qq21-datawidgetmapper.html,
but your solution with class SKGComboBox WORK...super..thanks