QMainWindow.resize prevent QGraphicsView.resize

[sonichy]

QMainWindow.resize will auto resize QGraphicsView to fit parent, how to prevent ？

void MainWindow::open(QString filepath)
{
    scene->clear();
    QPixmap pixmap(filepath);
    QGraphicsPixmapItem *GPI = scene->addPixmap(pixmap);
    GPI->setFlags(QGraphicsItem::ItemIsSelectable | QGraphicsItem::ItemIsMovable);
    scene->setSceneRect(0, 0, pixmap.width(), pixmap.height());
    ui->graphicsView->resize(pixmap.size());
}

[KillerSmath]

@sonichy
If your QGraphicsView is inside a QLayout, this layout automatically position and resize all child widgets.
But you can break the resize feature by setup a fixed Size of a widget.

setFixedHeight(int h)
setFixedWidth(int w)
setFixedSize(const QSize &s)
setFixedSize(int w, int h)

[sonichy]

@KillerSmath Yes, child widget with no layout will be not auto resize with parent !
But the scrollbar do not display !