Drawing a Checkbox Checkmark primitive with colored background

[flautzr]

Hi,

title says it all, I want to draw the checkmark with a colored background in the paint function of a custom delegate derived from QSytledItemDelegate. So far I tried

QStyleOptionFocusRect focusrectOption;
focusrectOption.rect = layerRect;
focusrectOption.backgroundColor = QColor(151,165,255);
 
QApplication::style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &focusrectOption, painter);

QStyleOptionFocusRect focusrectOption;
focusrectOption.rect = layerRect;
focusrectOption.backgroundColor = QColor(151,165,255);

QApplication::style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &focusrectOption, painter);

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and giving the QPainter a background color

painter->setBackground(QBrush(QColor(151,165,255)));
QApplication::style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &checkBoxOption, painter);

painter->setBackground(QBrush(QColor(151,165,255)));
QApplication::style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &checkBoxOption, painter);

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but it just doesnt draw anything. Any idea how to achieve this without having to draw the checkmark myself with lines?