class ImageLabel2 : public QWidget
{
    Q_OBJECT

public:
    int startHeigth;
    int startWidth;
    explicit ImageLabel2(QWidget *parent = 0);
    const QPixmap* pixmap() const;

public slots:
    void setPixmap(const QPixmap&);

protected:
    void paintEvent(QPaintEvent *);

private:
    QPixmap pix;
};

ImageLabel2::ImageLabel2(QWidget *parent) :
    QWidget(parent)
{
}

void ImageLabel2::paintEvent(QPaintEvent *event) {
    QWidget::paintEvent(event);

    if (pix.isNull())
        return;

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);

    QSize pixSize = pix.size();
    pixSize.scale(this->size(), Qt::KeepAspectRatio);//event->rect().size()




    QPixmap scaledPix = pix.scaled(pixSize,
                                   Qt::KeepAspectRatio,
                                   Qt::SmoothTransformation
                                   );

    painter.drawPixmap(QPoint(), scaledPix);

    qDebug() << pixSize.width() << " " << scaledPix.width() << " " << this->width();

}

const QPixmap* ImageLabel2::pixmap() const {
    return &pix;
}

void ImageLabel2::setPixmap (const QPixmap &pixmap){
    pix = pixmap;
    startHeigth = pixmap.height();
    startWidth = pixmap.width();
}

QVBoxLayout *scrollWidgetLayout = new QVBoxLayout(ui->scrollArea);


    QFrame* frame = new QFrame(ui->scrollArea);
    frame->setLayout(scrollWidgetLayout);


    ImageLabel2 *label = new ImageLabel2(ui->scrollAreaWidgetContents);
    //label->setSizePolicy(QSizePolicy::Maximum,QSizePolicy::Maximum);
    label->setPixmap(QPixmap::fromImage(QImage("1.jpg")));

    scrollWidgetLayout->addWidget(label);
    ImageLabel2 *label2 = new ImageLabel2(ui->scrollAreaWidgetContents);
    //label->setSizePolicy(QSizePolicy::Maximum,QSizePolicy::Maximum);
    label2->setPixmap(QPixmap::fromImage(QImage("1.jpg")));
    scrollWidgetLayout->addWidget(label2);

    ImageLabel2 *label3 = new ImageLabel2(ui->scrollAreaWidgetContents);
    //label->setSizePolicy(QSizePolicy::Maximum,QSizePolicy::Maximum);
    label3->setPixmap(QPixmap::fromImage(QImage("1.jpg")));
    scrollWidgetLayout->addWidget(label3);


    ui->scrollArea->setWidget(frame);