QTableWidget and QComboBox, issues when changing the QComboBox content

[Cayan]

Hi there,

I've added a QComboBox inside a QTableWidget, I need to process data every time this QComboBox content changes. There are a lot of these QComboBox in the QTableWidget.

What I have done so far:

• Used the QTableWidget SIGNALS, without success. Seems like they properly work only on QTableWidgetItems.
• Tried to connect the editTextChanged SIGNAL, worked but I need to know the row of the item. When I change the content using MouseWheel for example the table's current row does not change. The content of these QComboBox may be the same, so I can't search.
• Tried to install the event filter, but none seems to work when I confirm a new index for the QComboBox.
• Added a property to each of these dynamic items with their row position, helped on the event filter, but I had to disable the ordination system.

I'll try to sync all of what I've done to make it work.
Does anyone know a better way to do this?

[giesbert]

How did you add the combo boxes? Did you use the setTableWidget?

I would prefer using a QStyledItemDelegate subclass and use custom editors there (e.g. a combo box). That means, if you edit the table, a combo box appears in the edited cell and you can change the values.

[Cayan]

I used setCellWidget.
What is this setTableWidget? I couldn't find any reference for it. (with a fast google search)

I haven't used this class QStyledItemDelegate yet, your idea sounds interesting. Is there any example that you could show me?

A temporary solution that I've managed is to use setCurrentCell when the QEvent::FocusIn event is filtered.

Thanks for your answer!

[giesbert]

[quote author="Cayan" date="1314648789"]I used setCellWidget.
What is this setTableWidget? I couldn't find any reference for it. (with a fast google search)
[/quote]

Sorry, I meant setCellWidget :-)

[quote author="Cayan" date="1314648789"]I haven't used this class QStyledItemDelegate yet, your idea sounds interesting. Is there any example that you could show me?[/quote]

You can have a look at the "description of Model-View":http://doc.qt.nokia.com/4.7/model-view-programming.html#delegate-classes or at the "examples of Model-View":http://doc.qt.nokia.com/4.7/examples-itemviews.html or the "SpinBox Delegate example":http://doc.qt.nokia.com/4.7/itemviews-spinboxdelegate.html

The examples always use a view class but the QTableWidget is a derived class of QTableView, so the delegates will also work there

[goetz]

[quote author="Cayan" date="1314648789"]I used setCellWidget.
What is this setTableWidget? I couldn't find any reference for it. (with a fast google search)[/quote]

In this case you create a QComboBox, so I'd just connect a signal of that combobox to some slot.

[Cayan]

I tried to use the Model View system to make it work, but it gave me more headaches than solutions.
QTableView::setModel is private so I couldn't make it work with the table I had.

Now it is working, what I've done? Filtered the QEvent::FocusIn to force the Cell selection, here goes the code:

@bool Dialog::eventFilter(QObject object, QEvent event)
{
if(object->isWidgetType() && event->type() == QEvent::FocusIn)
{
QWidget widget = qobject_cast<QWidget>(object);
if(widget)
{
ui->table->setCurrentCell(widget->pos().y() / 30, 0);
}
}

return false;

}@

I'm using that stupid way to select the cell because it was not working with "the proper way". The cells height are constant so a temporary solution for a short on time project.

I'm glad this is working, but I found what I've considered an error, maybe from Qt.
I created a topic to discuss it: "link":http://developer.qt.nokia.com/forums/viewthread/9323/.