[SOLVED] Centering a dynamically created custom widget?

? Offline

I'm using the answer to this "SO question":http://stackoverflow.com/a/14107727/840992 to make a custom image widget which automatically scales correctly. It works fine but now I am trying to center the image widget instance at the center of my main window.

My idea was to create a QHBoxLayout, add the image widget to that and then add the hBox instance to the ui->verticalLayout.

Doesn't work. The image still displays flush left.

I then tried a few variations on 'setAlignment` for both/either the QHBoxLayout and the QVBoxLayout but then the image doesn't appear at all. My simple test code is below.

What am I missing here?

    MainWindow::MainWindow(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::MainWindow)
    {
        ui->setupUi(this);
        
        QPixmap pix;
        pix.load("/Users/home/Desktop/test.jpg");
        
        ImageLabel2* image = new ImageLabel2(this);
        image->setPixmap(pix);
        
        QHBoxLayout* hbox = new QHBoxLayout();
        hbox->addWidget(image);

        //    hbox->setAlignment(image,Qt::AlignCenter);

        hbox->setAlignment(Qt::AlignHCenter);

        //    ui->verticalLayout->addLayout(hbox);

        ui->verticalLayout->addLayout(hbox);

        //    ui->verticalLayout->addWidget(image);
        //    ui->verticalLayout->setAlignment(image,Qt::AlignCenter);
        //    ui->verticalLayout->setAlignment(Qt::AlignHCenter);
        
    }

Chris Kawa

To be honest this first SO answer is bad. Please don't use it.
The second one (with paintEvent) is ok, but needs a modification to center the image:

class CustomWidget : public QWidget {
public:
    CustomWidget(const QPixmap &p, QWidget* parent = 0)
        : QWidget(parent), pixmap(p) {}

    void paintEvent(QPaintEvent * e)
    {
        QRect srcRect(QPoint(), pixmap.size());
        QSize dstSize = srcRect.size().scaled(
              e->rect().size(), Qt::KeepAspectRatio);
        QRect dstRect(QPoint((width() - dstSize.width())/2,
                             (height() - dstSize.height())/2), dstSize);

        QPainter p(this);
        p.setRenderHint(QPainter::Antialiasing);
        p.drawPixmap(dstRect, pixmap, srcRect);
    }
private:
    QPixmap pixmap;
};

and then in the main window:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setCentralWidget(new CustomWidget(QPixmap("test.png")));
}