Method paintEvent

src/widgets.cpp:201–251

}

void RangeSlider::paintEvent(QPaintEvent *)
{
    QPainter painter(this);

    QStyleOptionSlider opt;
    initStyleOption(&opt);

    // draw the back groove of the slider without range highlighting
    opt.subControls = QStyle::SC_SliderGroove;
    opt.sliderValue = opt.sliderPosition = vmin;
    style()->drawComplexControl(QStyle::CC_Slider, &opt, &painter, this);

    // draw the range highlighting between the handles
    QRect groove = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderGroove, this);
    opt.sliderValue = opt.sliderPosition = pos0;
    QRect handle0 = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
    opt.sliderValue = opt.sliderPosition = pos1;
    QRect handle1 = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);

    if (colinner.isValid())
    {
        painter.setBrush(QBrush(colinner));
        painter.setPen(QPen(colinner, 0));
        int x0 = handle0.center().x();
        int x1 = handle1.center().x();
        int y  = handle0.center().y() - 1;
        QRect span = QRect(x0, y, x1-x0, 3);
        painter.drawRect(groove.intersected(span));
    }
    if (colouter.isValid())
    {
        painter.setBrush(QBrush(colouter));
        painter.setPen(QPen(colouter, 0));
        int x0 = handle0.center().x();
        int x1 = handle1.center().x();
        int y  = handle0.center().y() - 1;
        QRect left = QRect(groove.x()+1, y, x0-groove.x()-2, 3);
        painter.drawRect(groove.intersected(left));
        QRect right = QRect(x1+1, y, groove.right()-x1-2, 3);
        painter.drawRect(groove.intersected(right));
    }

    int pmin = pos0 < pos1 ? pos0 : pos1;
    int pmax = pos0 > pos1 ? pos0 : pos1;
    // draw handles
    opt.subControls = QStyle::SC_SliderHandle;
    opt.sliderValue = opt.sliderPosition = pmax;
    style()->drawComplexControl(QStyle::CC_Slider, &opt, &painter, this);
    opt.sliderValue = opt.sliderPosition = pmin;
    style()->drawComplexControl(QStyle::CC_Slider, &opt, &painter, this);
}

void RangeSlider::mousePressEvent(QMouseEvent *e)
{