如何在QQuickView中缩放整个QML2场景？

Question

I have a QML2 document which is significantly larger than the display on which it's displayed with a QQuickView. In QML1 and QtDeclarative it was possible to use QGraphicsView::fitInView to scale the whole scene (including correct MouseEvent mapping, etc).

Is there something similar for QML2 I just didn't find yet?

Answer 1

I came up with a solution that somehow behaves like QGraphicsView::fitInView(aRect, Qt::KeepAspectRatio) .

void MyQuickView::fitInView(const QRectF & newRect)
{
    QSizeF newSize = newRect.size();
    qreal horizontalScale = size().width() / newSize.width();
    qreal verticalScale = size().height() / newSize.height();

    // You might want to use another origin
    rootObject()->setTransformOrigin(QQuickItem::TopLeft);

    rootObject()->setSize(newSize);
    rootObject()->setScale(qMin(horizontalScale, verticalScale));
}

This does mostly the job, although I haven't thoroughly tested all of my old Qt4.8 code.