Method wheelEvent

src/widgets.cpp:288–333

}

void RangeSlider::wheelEvent(QWheelEvent *e)
{
    QStyleOptionSlider opt;
    initStyleOption(&opt);

    QRect groove = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderGroove, this);

    int delta = e->angleDelta().y() / 8 / 15;
    int x;
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
    x = e->x() - groove.x();
#else
    x = (int)e->position().x() - groove.x();
#endif
    x = style()->sliderValueFromPosition(vmin, vmax, x, groove.width());

    int h = 0;
    if (x < pos0)
        h = -1;
    else if (x > pos1)
        h = +1;
    else if (abs(pos0 - x) < abs(pos1 - x))
        h = -1;
    else if (abs(pos0 - x) > abs(pos1 - x))
        h = +1;

    if (e->modifiers() & Qt::ControlModifier)
        delta *= 50;

    if (h < 0)
    {
        pos0 += delta;
        if (pos0 < vmin) pos0 = vmin;
        if (pos0 > pos1) pos0 = pos1;
        emit valueChanged(pos0);
    }
    else
    {
        pos1 += delta;
        if (pos1 > vmax) pos1 = vmax;
        if (pos1 < pos0) pos1 = pos0;
        emit valueChanged(pos1);
    }

    update();
}

void RangeSlider::mouseMoveEvent(QMouseEvent *e)
{