QSlider

Добрый день, интересует такой вопрос, есть идея рядом с ползунком слайдера через ToolTip отображать значение, к примеру в windows 7 при изменении звука в системе рядом с ползунком появляется такой тул тип, я это реализовал так:

void MainWindow::on_horizontalSlider_valueChanged(int value)
{
    QPoint pos(QCursor::pos().x(), QCursor::pos().y() - 50);
    QToolTip::showText(pos, QString("%0").arg(value));
}

#ifndef CUSTOMSLIDER_H
#define CUSTOMSLIDER_H

#include <QSlider>
#include <QLabel>

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

protected:

protected:
    virtual void mouseMoveEvent(QMouseEvent *event) override;
    virtual void mousePressEvent(QMouseEvent *event) override;
    virtual void mouseReleaseEvent(QMouseEvent *event) override;

private:
    Qt::Orientation m_orientation;
    QLabel* m_tooltip;
};

#endif // CUSTOMSLIDER_H

#include "CustomSlider.h"

#include <QStyleOptionSlider>
#include <QMouseEvent>

CustomSlider::CustomSlider(Qt::Orientation orientation, QWidget *parent) :
    QSlider(orientation, parent),
    m_orientation(orientation),
    m_tooltip(new QLabel(parent,Qt::ToolTip))
{
  QFontMetrics metrics(m_tooltip->font());
  //Setting a size big enough for all values less than 100
  QRect labelRect = metrics.boundingRect("88");
  m_tooltip->setMinimumWidth(labelRect.width()+1);
  m_tooltip->setAlignment(Qt::AlignRight);
}

void CustomSlider::mousePressEvent(QMouseEvent *event)
{
    QSlider::mousePressEvent(event);

    QStyleOptionSlider opt;
    initStyleOption(&opt);
    QRect sliderHandle = style()->subControlRect(QStyle::CC_Slider,&opt,QStyle::SC_SliderHandle,this);

    if(sliderHandle.contains(event->pos()))
    {
        if (m_orientation == Qt::Vertical)
        {
            m_tooltip->move(mapToGlobal(sliderHandle.topLeft()).x()+width(),mapToGlobal(sliderHandle.topLeft()).y());
        }
        else
        {
            m_tooltip->move(mapToGlobal(sliderHandle.topLeft()).x(),mapToGlobal(sliderHandle.topLeft()).y()+height());
        }

        qreal percentReal = ((qreal)100 * value() ) / ( maximum() - minimum());
        int percent = qRound(percentReal);
        m_tooltip->setText(QString::number(percent));
        m_tooltip->show();
    }
}

void CustomSlider::mouseReleaseEvent(QMouseEvent *event)
{
    QSlider::mouseReleaseEvent(event);
    m_tooltip->hide();
}

void CustomSlider::mouseMoveEvent(QMouseEvent *event)
{
    QSlider::mouseMoveEvent(event);

    QStyleOptionSlider opt;
    initStyleOption(&opt);
    QRect sliderHandle = style()->subControlRect(QStyle::CC_Slider,&opt,QStyle::SC_SliderHandle,this);

    qreal percentReal = ((qreal)100 * value() ) / ( maximum() - minimum() );
    int percent = qRound(percentReal);

    //Change width of label if percent becomes 100
    if (percent == 100)
    {
        QFontMetrics metrics(m_tooltip->font());
        QRect labelRect = metrics.boundingRect("100");
        m_tooltip->resize(labelRect.width(),m_tooltip->height());
    }
    else if(m_tooltip->width() >= m_tooltip->minimumWidth())
    {
        m_tooltip->resize(m_tooltip->minimumWidth(),m_tooltip->height());
    }
    m_tooltip->setText(QString::number(percent));

    if (m_orientation == Qt::Vertical)
    {
        m_tooltip->move(mapToGlobal(sliderHandle.topLeft()).x()+width(),mapToGlobal(sliderHandle.topLeft()).y());
    }
    else
    {
        m_tooltip->move(mapToGlobal(sliderHandle.topLeft()).x(),mapToGlobal(sliderHandle.topLeft()).y()+height());
    }
}