Method wheelEvent

DSView/pv/view/viewport.cpp:1329–1432

}

void Viewport::wheelEvent(QWheelEvent *event)
{
    assert(event);

    if (_view.header_is_draging()){
        return;
    }

    int x = 0;  //mouse x pos
    int delta = 0;
    bool isVertical = true;

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    x = (int)event->position().x(); 
    int anglex = event->angleDelta().x();
    int angley = event->angleDelta().y();

    if (anglex == 0 || ABS_VAL(angley) >= ABS_VAL(anglex)){
        delta = angley;
        isVertical = true;
    }
    else{
        delta = anglex;
        isVertical = false; //hori direction
    }
#else
    x = event->x();
    delta = event->delta();
    isVertical = event->orientation() == Qt::Vertical;
#endif

    double zoom_scale = delta / 80;

    if (ABS_VAL(delta) <= 80){
        zoom_scale = delta > 0 ? 1.5 : -1.5;
    }

    if (_type == FFT_VIEW)
    {
        for (auto t : _view.session().get_spectrum_traces())
        { 
            if (t->enabled())
            {
                t->zoom(zoom_scale, x);
                break;
            }
        }
    }
    else if (_type == TIME_VIEW)
    {
        static bool bLstTime = false;

        if (isVertical)
        {
            // Vertical scrolling is interpreted as zooming in/out
#ifdef Q_OS_DARWIN
            static int64_t last_time;