@J-Hilk thank you

@Sphinkie Wow, I had not noticed there is such a namespace since I'm still mainly using 5.12. If the constants are QColor objects as the doc says, then you should be able to use them directly like w->setForeground(QColorConstants::Red); w->setBackground(QColorConstants::Yellow);

First of all, as mentioned in the docs, Qt::TextColorRole is obsolete and you should not use it. Use Qt::ForegroundRole instead. Second, as mentioned by @alex_malyu, it depends on the model whether or not it implements that. QStandardItemModel for example will, but your custom model might not. So the question is what is your model class.