Resetting a QSlider with double click

[Lykurg]

QSlider is a QWidget, thus you can use QWidget::mouseDoubleClickEvent(). Simple subclass something like

class MySlider : public QSlider
{
  protected:
    void mouseDoubleClickEvent(QMouseEvent *event);
}
 
MySlider::mouseDoubleClickEvent(QMouseEvent *event)
{
  setValue(0);
  QSlider::mouseDoubleClickEvent(QMouseEvent *event);
}

class MySlider : public QSlider
{
  protected:
    void mouseDoubleClickEvent(QMouseEvent *event);
}

MySlider::mouseDoubleClickEvent(QMouseEvent *event)
{
  setValue(0);
  QSlider::mouseDoubleClickEvent(QMouseEvent *event);
}

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Or install an event filter.