How to align text in a header of QTableView in Qt using only CSS?

Question

I tried the CSS code:

QTableView QHeaderView::section {
    text-align: center;
 }

And it did not help me.

PS I write the SCADA system in the WinCC OA that uses Qt, and there you can change the appearance of components only using CSS

Dosia

table header is used as thead, so you can write thead tr th {text-align: center;} – Lactometer

@Sonia, it is not HTML, it is Qt and its graphic objects. So there are other CSS selectors here. – Dosia

@MaxLich, QSS to be precise. Here you can see what is available for each class. – Sphinx

@Sphinx Thank you, but I have already seen it – Dosia

Answer 1

As seen in the source code for QHeaderView::paintSection

QVariant textAlignment = d->model->headerData(logicalIndex, d->orientation,
                                              Qt::TextAlignmentRole);
opt.rect = rect;
opt.section = logicalIndex;
opt.state |= state;
opt.textAlignment = Qt::Alignment(textAlignment.isValid()
                                  ? Qt::Alignment(textAlignment.toInt())
                                  : d->defaultAlignment);

QHeaderView does not uses the stylesheet to define the text alignment, only values from the defaultAlignment or the data from the header's model (Qt::TextAlignmentRole).

Now, if your default alignment is either Qt::AlignLeft or Qt::AlignRight, you can use the section padding to automatically center it:

QTableView QHeaderView::section {
    padding-left: auto;
    padding-right: auto;
}

The opposite is not true: if default alignment is center, other calculus affect how padding is used and cannot be used to automatically left- or right-align text.

Switcheroo

Answer 2

I have found one of the solutions:

QHeaderView {
    qproperty-defaultAlignment: AlignHCenter AlignVCenter;
}

Although it works in WinCC OA only partially.

Dosia

Interesting access to properties from within the stylesheet, didn't know about it! – Switcheroo