Disable Item in Qt Combobox

Question

I can\'t find a standard way to disable an individual item in a Qt combo box. Is there a facility to do this in Qt that I am missing?

Answer 1

In case your combo box is using a QStandardItemModel (which it does by default) then you may stay away from the Qt::UserRole -1 hack (see blog post to which Desmond refers to in his answer above):

const QStandardItemModel* model = qobject_cast(ui->comboBox->model());
QStandardItem* item = model->item(1);

item->setFlags(disable ? item->flags() & ~(Qt::ItemIsSelectable|Qt::ItemIsEnabled)
                       : Qt::ItemIsSelectable|Qt::ItemIsEnabled));
// visually disable by greying out - works only if combobox has been painted already and palette returns the wanted color
item->setData(disable ? ui->comboBox->palette().color(QPalette::Disabled, QPalette::Text)
                      : QVariant(), // clear item data in order to use default color
              Qt::TextColorRole);

Above code is a revised and more generic solution to my comment to the blog post.