'Rounded QComboBox without square box behind

I'm styling a QComboBox in Qt. It is rounded how the figure shows. The problem is that is shows a strange square box behind the rounded border.

Can someone tell me what this box is and how to make it invisible?

By the way, I'd like to take the shadow away too.

enter image description here

Here is my current code:

QComboBox {
    border: 1px solid gray;
    border-radius: 10px;
    min-width: 6em;
}

QComboBox:on {
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
}

QComboBox QAbstractItemView {
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
    background: white;
    border: 1px solid gray;
    box-shadow: transparent;
}

QComboBox::drop-down {
    border-color: transparent;
}

Can somebody help here?? Thanks!

cssqtstylesheetqcombobox


Solution 1:[1]

I think it will help you

QComboBox QAbstractItemView {
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
    background: white;
    border: 1px solid gray;
    box-shadow: transparent;
    padding: 4px 4px 4px 4px
}

Solution 2:[2]

you can add code behind like this,

(your qcombobox)->view()->window()->setWindowFlags(Qt::Popup | Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint);

i tried, it works

Solution 3:[3]

Here's what worked for me with Qt 6.2 on Windows 11/macOS 12:

comboBox->setStyleSheet("QComboBox {"
                            "combobox-popup: 0;"
                            "background: transparent;"
                            "}");
comboBox->view()->setStyleSheet("QListView{"
                        "border:1px solid red;"
                        "border-radius: 8px;"
                        "}");
comboBox->view()->window()->setWindowFlags( Qt::Popup | Qt::FramelessWindowHint |Qt::NoDropShadowWindowHint);
comboBox->view()->window()->setAttribute(Qt::WA_TranslucentBackground);

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 acraig5075
Solution 3 Robin Lobel

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