How to set color

[shanto]

I have a list of cars, which have different colors. When the user enters a color I want all cars with the same color to be highlighted with that.
I have tried something like this, but it doesn't work.
string color = colorEdt->text().toStdString();
....
item->setData(Qt::BackgroundRole,QColor::setNamedColor(color));
Could you give me some tips?

item->setData(Qt::BackgroundRole,QColor::setNamedColor(color));

[kshegunov]

@shanto
Hello,
We would need some more code. What kind of list is that, is it a QListWidget? Where do you call item->setData(Qt::BackgroundRole,QColor::setNamedColor(color)), is it connected to a signal?
And finally a note:

string color = colorEdt->text().toStdString();

Don't convert to std::string without any good reason, use Qt's QString instead, it's also is implicitly shared (which std::string is not) so there won't be unnecessary copying involved.

Kind regards.

[shanto]

@kshegunov Hi! So here's what I'm trying to do:

void UI::colorCars()
{
    //I get the color from a QLineEdit
    string color = colorEdt->text().toStdString(); 

    //list contains the current cars in repository and guiList is a QListWidget
    std::vector<Car> llist = carCon.getCarsController();
    guiList->clear();

    for(Car& car : list)
    {
        QListWidgetItem* item = new QListWidgetItem(QString::fromStdString(car.getNrMatr()),guiList);
        item->setData(Qt::UserRole,QVariant::fromValue(car.getId()));
        
        //I compare each car in the list with "color" and if it is the same I have to color the item with it(blue,green,yellow etc.)
        if(car.getColor() == color)
        {
            item->setData(Qt::BackgroundRole,QColor(Qt::color));
        }
    }
}

[kshegunov]

@shanto
Hello,

item->setData(Qt::BackgroundRole, QColor(Qt::color));

This doesn't look correct. I'd try something like this:

item->setData(Qt::BackgroundRole, QColor(QString::fromStdString(color)));

But the color name should be parse-able, otherwise you'd an invalid color.

[shanto]

@kshegunov Thanks a lot! It works now. :)