Update and sort Qt ComboBoxes alphabetically

Question

I want to write a program, working like a little navigation system uisng the Qt framework, but i still am very new to it.

I created a dialog with two Comboboxes. Each combobox contains all "citynames". At the initialization the content of both boxes is sorted alphabetically.

If a name in the first box is selected, it should not be displayed in the second one and the other way too.

I successfully removed the item and added it again, if another item is selected, but know i cannot sort them anymore

This is what i tried so far for updating:

for(std::vector<City>::iterator iter = citylist.begin(); iter != citylist.end(); iter++){
    if(ui->combo2->currentText() != (*iter).getName()
            and ui->combo1->findText((*iter).getName()) == -1){
        ui->combo1->addItem((*iter).getName(),QComboBox::InsertAlphabetically);
    }
}

but it does not insert the items alphabetically...

so i tried to sort it afterwards:

 QSortFilterProxyModel* proxy = new QSortFilterProxyModel(ui->combo1);

proxy->setSourceModel(ui->combo1->model());

// combo's current model must be reparented,
// otherwise QComboBox::setModel() will delete it
ui->combo1->model()->setParent(proxy);

ui->combo1->setModel(proxy);

// sort
ui->combo1->model()->sort(0);

But if i try to call this function an error occurs and the application terminates.

So is anyone out there, who is able to help me?

Answer 1

You were nearly there!

ui->comboBox1.addItem("myitem");
// qApp->processEvents();  not really needed
ui->comboBox1.model()->sort(0);