How to read QWidget style margin?

[Kattia]

I'm working on a customizable QComboBox, i'm trying to find a way to read the QAbstractItemView margin, when its modified from a stylesheet, for example:

QComboBox QAbstractItemView 
{
	background-color: rgba(40, 40, 40, 180);
	border-radius: 8px;
	margin: 30px;
}

I tried to read the margin as:

void ComboBox::showPopup() override
{
        // ...
        QWidget* comboWindow = view()->window();
        QStyle* style = comboWindow->style();
        int margin = style->pixelMetric(QStyle::PM_LayoutLeftMargin, nullptr, comboWindow);
        // ...
}

But it returned 11, i have no idea what this means, how I could get the margin without relying on parsing it from
widget->styleSheet()

[JonB]

@Kattia
To the best of my knowledge and as asked in the past, stylesheet overrides style. You cannot discover in code the effects of stylesheet, and would have to parse if you needed that information.

P.S.
To clarify: not that this is ideal, it's just how it is. JavaScript from HTML, for example, gives you access to current style from applied stylesheet rules, but sadly Qt does not seem to do so.

[Kattia]

@JonB and if you don't know from where the stylesheet comes? like when you set the stylesheet on a parent and its applied to children's.

[JonB]

@Kattia
Yep, you would have to figure out inheritance for yourself (e.g. recurse up in your case).
Since you're not going to do it, try not to need to know such a detail.

[Kattia]

@JonB said in How to read QWidget style margin?:

try not to need to know such a detail.

nice, and how ill find the data i need?