How to change QComboBox items' height

Question

I want change only the height, I need it larger.

Answer 1

A first option is to set a new popup, for example a QListView and change the size using Qt Style Sheet:

#include <QApplication>
#include <QComboBox>
#include <QListView>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QComboBox combo;
    QListView *view = new QListView(&combo);
    view->setStyleSheet("QListView::item{height: 100px}");
    combo.setView(view);
    combo.addItems({"A", "B", "C", "D", "E", "F"});
    combo.show();
    return a.exec();
}

Another option is to set a delegate to the popup that resizes:

#include <QApplication>
#include <QComboBox>
#include <QStyledItemDelegate>
#include <QAbstractItemView>

class PopupItemDelegate: public QStyledItemDelegate
{
public:
    using QStyledItemDelegate::QStyledItemDelegate;
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        QSize s = QStyledItemDelegate::sizeHint(option, index);
        s.setHeight(60);
        return s;
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QComboBox combo;
    combo.view()->setItemDelegate(new PopupItemDelegate(&combo));
    combo.addItems({"A", "B", "C", "D", "E", "F"});
    combo.show();
    return a.exec();
}