Question

Is there a way I could increase the height of the items, which are listed in a QComboBox control ?

I tried following as suggested here in QTDevNet forums but with no luck

QComboBox QAbstractItemView::item {margin-top: 3px;}

I also tried this, still with no result.

QComboBox QAbstractItemView::item {min-height: 20px;}

Is it possible to achieve this at style-sheet level at all ?

Answer 1

Your style sheet seemed correct, so I tried it. It seems the problem is similar to this one on Qt centre:

QCompleter sets a custom QAbstractItemDelegate on its model and unfortunately this custom item delegate does not inherit QStyledItemDelegate but simply QItemDelegate (and then overrides the paint method to show the selected state).

If you replace the default delegate by a QStyledItemDelegate, your style sheet should work:

QStyledItemDelegate* itemDelegate = new QStyledItemDelegate();
combo->setItemDelegate(itemDelegate);

Important: If you change the model, then that will reset the view’s delegate, so the above method needs to be called after any call to setModel().