QSlider show min, max and current value

You have two options..

1) as being mentioned in comments - sub - class

2) add as many QLabel's as you like with QSlider as a parent, install eventHandler() on QSlider to catch resize event to proper position them, and obviously handle scroll events, so you can update them... So labels will just float on top of QSlider

Here is my quick implementation of a fancy slider which subclass qslider to displays the current value just below the slider handle into a tooltip.

Header

#ifndef FANCYSLIDER_H
#define FANCYSLIDER_H

#include <QSlider>

class FancySlider : public QSlider
{
    Q_OBJECT
public:
    explicit FancySlider(QWidget *parent = 0);
    explicit FancySlider(Qt::Orientation orientation, QWidget *parent = 0);

protected:
    virtual void sliderChange(SliderChange change);
};

#endif // FANCYSLIDER_H

Cpp

#include "FancySlider.h"

#include <QStyleOptionSlider>
#include <QToolTip>

FancySlider::FancySlider(QWidget * parent)
    : QSlider(parent)
{
}

FancySlider::FancySlider(Qt::Orientation orientation, QWidget * parent)
    : QSlider(orientation, parent)
{
}

void FancySlider::sliderChange(QAbstractSlider::SliderChange change)
{
    QSlider::sliderChange(change);

    if (change == QAbstractSlider::SliderValueChange )
    {
        QStyleOptionSlider opt;
        initStyleOption(&opt);

        QRect sr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
        QPoint bottomRightCorner = sr.bottomLeft();

        QToolTip::showText(mapToGlobal( QPoint( bottomRightCorner.x(), bottomRightCorner.y() ) ), QString::number(value()), this);
    }
}