I have a stupid issue, but cannot find any solutions for this. I think I may missing some understanding :

I want to display an image in a Scroll Area, and I want it at the center. I made the following code:

void MainWindow::setImage(const QImage &newImage)
{
    scrollArea = new QScrollArea;
    imageLabel = new QLabel;

    scrollArea->setWidget(imageLabel);
    scrollArea->setFrameShape(QFrame::NoFrame);
    scrollArea->setStyleSheet("QScrollBar:vertical{width: 50px;}");

    ui->horizontalLayout->addWidget(scrollArea);

    image = newImage;
    if (image.colorSpace().isValid())
        image.convertToColorSpace(QColorSpace::SRgb);
    imageLabel->setPixmap(QPixmap::fromImage(image));

    imageLabel->adjustSize();
    imageLabel->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
}

It works, but the problem is that the image contained in the label remain aligned to the left, regardless of the setAlignment(Qt::AlignHCenter | Qt::AlignVCenter) instruction.

Any ideas why ?

PS: I can't use QtCreator to change it.