How can I ignore horizontally QWheelEvent?(for mouse pad)

ardaozdemir

I use QWheelEvent for zoom in/out on GraphicsScene but the problem is that zoom in/out is also working when I use mouse pad horizontally. I want to ignore this situation. I want to do zoom in/out on mouse pad just vertically.

My code is:

void WheeledGraphicsView::wheelEvent(QWheelEvent *event){
        setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
        double scaleFactor = 1.15;
        if(event->delta() > 0) {
            scale(scaleFactor, scaleFactor);
        }
        else {
            scale(1.0 / scaleFactor, 1.0 / scaleFactor);
        }
       // QWheelEvent.orientation();
}

maybe I can use QWheelEvent::orientation() but I couldn't use it. thank you !

mrjj

Hi and welcome

code shows
// QWheelEvent.orientation();

but I assume you did mean

event->orientation(); ?

Why cant you use it ?

ardaozdemir

@mrjj Hi,

actually I don't understand how can I ignore horizontally wheelevent using QWheelEvent::orientation(). So I couldn't it bcs of I don't understand.

thank you.

mrjj

@ardaozdemir
ok.

Can you check if its different for horizontally versus vertically "wheeling"
?

just qDebug() the value

ardaozdemir

okey I solved the problem.

void WheeledGraphicsView::wheelEvent(QWheelEvent *event){
    if(event->orientation() == Qt::Horizontal) {
        event->ignore();
    }
    else {
        if(event->delta() > 0) {
            scale(ZOOM_RATIO_PER_WHEEL_TICK, ZOOM_RATIO_PER_WHEEL_TICK);
        }
        else {
            scale(1.0 / ZOOM_RATIO_PER_WHEEL_TICK, 1.0 / ZOOM_RATIO_PER_WHEEL_TICK);
        }
    }
}

thank you.

mrjj

So I assume it did have the right value :)
please mark as solved if possible.