How to align QPushButton and QComboBox in a horizontal layout?

Question

I am trying to align QPushButton and QComboBox in a horizontal layout, but for some reason I cannot do it and I always get this kind of alignment:

So, QComboBox is always a bit higher than it should be.

This is on macOS Big Sur 11.2.3 and version of Qt is 5.12.10. Is there some kind of workaround or fix for this?

Answer 1

Try to set the layout stretch of the items to the same value.

or with code:
horizontalLayout->setStretch(1 /* Item index */, 1 /* Stretch Factor */) // Do that for all items. https://doc.qt.io/qt-5/qboxlayout.html#setStretch

Answer 2

I think I found a workaround. I found this topic on Qt Forum and it seems that for some reason QPushButton is drawn that way. So for now I have overridden method paintEvent() which now draws button on more or less good position:

virtual void paintEvent(QPaintEvent* event) override {
    QStylePainter p(this);
    QStyleOptionButton option;
    initStyleOption(&option);
    option.rect = rect().adjusted(0, -2, 0, -2);
    p.drawControl(QStyle::CE_PushButton, option);
}