qt6-migration-pipeline/Lts/Common/LtsWidgets/lts_range_slider.cpp

#include "lts_range_slider.h"


#include <QDebug>
#include <QMouseEvent>
#include <QKeyEvent>
#include <QStyleOptionSlider>
#include <QStylePainter>
#include <QStyle>
#include <QToolTip>

namespace LtsWidgets
{

class LtsRangeSliderPrivate
{
  Q_DECLARE_PUBLIC(LtsRangeSlider)
protected:
  LtsRangeSlider *const q_ptr;
public:
  
  
  enum Handle
  {
    NoHandle = 0x0,
    MinimumHandle = 0x1,
    MaximumHandle = 0x2
  };
  Q_DECLARE_FLAGS(Handles, Handle)

  explicit LtsRangeSliderPrivate(LtsRangeSlider &object);
  void init();

  
  
  
  
  Handle handleAtPos(const QPoint &pos, QRect &handleRect) const;

  
  int pixelPosToRangeValue(int pos) const;
  int pixelPosFromRangeValue(int val) const;

  
  void drawMinimumSlider(QStylePainter *painter) const;
  void drawMaximumSlider(QStylePainter *painter) const;

  
  int m_minimumValue = 0;
  int m_maximumValue = 100;

  
  int m_minimumPosition = 0;
  int m_maximumPosition = 100;

  
  QStyle::SubControl m_minimumSliderSelected = QStyle::SC_None;
  QStyle::SubControl m_maximumSliderSelected = QStyle::SC_None;

  
  
  int m_subclassClickOffset = 0;

  
  
  int m_subclassPosition = 0;

  
  float m_subclassWidth = 0;

  LtsRangeSliderPrivate::Handles m_selectedHandles = {};

  
  
  bool m_symmetricMoves = false;

  QString m_handleToolTip;

private:
  Q_DISABLE_COPY(LtsRangeSliderPrivate)
};


LtsRangeSliderPrivate::LtsRangeSliderPrivate(LtsRangeSlider &object)
  : q_ptr(&object)
{}


void LtsRangeSliderPrivate::init()
{
  Q_Q(LtsRangeSlider);
  m_minimumValue = q->minimum();
  m_maximumValue = q->maximum();
  m_minimumPosition = q->minimum();
  m_maximumPosition = q->maximum();
  q->connect(q, &LtsRangeSlider::rangeChanged, q, &LtsRangeSlider::onRangeChanged);
}


LtsRangeSliderPrivate::Handle LtsRangeSliderPrivate::handleAtPos(const QPoint &pos, QRect &handleRect)const
{
  Q_Q(const LtsRangeSlider);

  QStyleOptionSlider option;
  q->initStyleOption(&option);

  
  
  

  
  option.sliderPosition = m_minimumPosition;
  option.sliderValue    = m_minimumValue;

  QStyle::SubControl minimumControl = q->style()->hitTestComplexControl(
                                        QStyle::CC_Slider, &option, pos, q);
  QRect minimumHandleRect = q->style()->subControlRect(
                              QStyle::CC_Slider, &option, QStyle::SC_SliderHandle, q);

  
  option.sliderPosition = m_maximumPosition;
  option.sliderValue    = m_maximumValue;

  QStyle::SubControl maximumControl = q->style()->hitTestComplexControl(QStyle::CC_Slider, &option, pos, q);
  QRect maximumHandleRect = q->style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderHandle, q);

  
  if (minimumControl == QStyle::SC_SliderHandle &&
      maximumControl == QStyle::SC_SliderHandle)
  {
    int minDist = 0;
    int maxDist = 0;
    if (q->orientation() == Qt::Horizontal)
    {
      minDist = pos.x() - minimumHandleRect.left();
      maxDist = maximumHandleRect.right() - pos.x();
    }
    else 
    {
      minDist = minimumHandleRect.bottom() - pos.y();
      maxDist = pos.y() - maximumHandleRect.top();
    }
    Q_ASSERT(minDist >= 0 && maxDist >= 0);
    minimumControl = minDist < maxDist ? minimumControl : QStyle::SC_None;
  }

  if (maximumControl == QStyle::SC_SliderHandle)
  {
    handleRect = maximumHandleRect;
    return MaximumHandle;
  }
  else if (minimumControl == QStyle::SC_SliderHandle)
  {
    handleRect = minimumHandleRect;
    return MinimumHandle;
  }

  handleRect = minimumHandleRect.united(maximumHandleRect);
  return NoHandle;
}




int LtsRangeSliderPrivate::pixelPosToRangeValue(int pos) const
{
  Q_Q(const LtsRangeSlider);
  QStyleOptionSlider option;
  q->initStyleOption(&option);

  QRect gr = q->style()->subControlRect(QStyle::CC_Slider,
                                        &option,
                                        QStyle::SC_SliderGroove,
                                        q);
  QRect sr = q->style()->subControlRect(QStyle::CC_Slider,
                                        &option,
                                        QStyle::SC_SliderHandle,
                                        q);
  int sliderMin, sliderMax, sliderLength;
  if (option.orientation == Qt::Horizontal)
  {
    sliderLength = sr.width();
    sliderMin = gr.x();
    sliderMax = gr.right() - sliderLength + 1;
  }
  else
  {
    sliderLength = sr.height();
    sliderMin = gr.y();
    sliderMax = gr.bottom() - sliderLength + 1;
  }

  return QStyle::sliderValueFromPosition(q->minimum(),
                                         q->maximum(),
                                         pos - sliderMin,
                                         sliderMax - sliderMin,
                                         option.upsideDown);
}


int LtsRangeSliderPrivate::pixelPosFromRangeValue(int val) const
{
  Q_Q(const LtsRangeSlider);
  QStyleOptionSlider option;
  q->initStyleOption(&option);

  QRect gr = q->style()->subControlRect(QStyle::CC_Slider,
                                        &option,
                                        QStyle::SC_SliderGroove,
                                        q);
  QRect sr = q->style()->subControlRect(QStyle::CC_Slider,
                                        &option,
                                        QStyle::SC_SliderHandle,
                                        q);
  int sliderMin, sliderMax, sliderLength;
  if (option.orientation == Qt::Horizontal)
  {
    sliderLength = sr.width();
    sliderMin = gr.x();
    sliderMax = gr.right() - sliderLength + 1;
  }
  else
  {
    sliderLength = sr.height();
    sliderMin = gr.y();
    sliderMax = gr.bottom() - sliderLength + 1;
  }

  return QStyle::sliderPositionFromValue(q->minimum(),
                                         q->maximum(),
                                         val,
                                         sliderMax - sliderMin,
                                         option.upsideDown) + sliderMin;
}



void LtsRangeSliderPrivate::drawMinimumSlider(QStylePainter *painter) const
{
  Q_Q(const LtsRangeSlider);
  QStyleOptionSlider option;
  q->initMinimumSliderStyleOption(&option);

  option.subControls    = QStyle::SC_SliderHandle;
  option.sliderValue    = m_minimumValue;
  option.sliderPosition = m_minimumPosition;
  if (q->isMinimumSliderDown())
  {
    option.activeSubControls = QStyle::SC_SliderHandle;
    option.state |= QStyle::State_Sunken;
  }
#ifdef Q_OS_MAC
  
  QRect clip = q->style()->subControlRect(QStyle::CC_Slider, &option,
                                          QStyle::SC_SliderHandle, q);
  painter->setClipRect(clip);
#endif
  painter->drawComplexControl(QStyle::CC_Slider, option);
}



void LtsRangeSliderPrivate::drawMaximumSlider(QStylePainter *painter) const
{
  Q_Q(const LtsRangeSlider);
  QStyleOptionSlider option;
  q->initMaximumSliderStyleOption(&option);

  option.subControls = QStyle::SC_SliderHandle;
  option.sliderValue = m_maximumValue;
  option.sliderPosition = m_maximumPosition;
  if (q->isMaximumSliderDown())
  {
    option.activeSubControls = QStyle::SC_SliderHandle;
    option.state |= QStyle::State_Sunken;
  }
#ifdef Q_OS_MAC
  
  QRect clip = q->style()->subControlRect(QStyle::CC_Slider, &option,
                                          QStyle::SC_SliderHandle, q);
  painter->setClipRect(clip);
#endif
  painter->drawComplexControl(QStyle::CC_Slider, option);
}


LtsRangeSlider::LtsRangeSlider(Qt::Orientation o,
                               QWidget *parent)
  : QSlider(o, parent)
  , d_ptr(new LtsRangeSliderPrivate(*this))
{
  Q_D(LtsRangeSlider);
  d->init();
}


LtsRangeSlider::LtsRangeSlider(LtsRangeSliderPrivate *impl, Qt::Orientation o,
                               QWidget *parent)
  : QSlider(o, parent)
  , d_ptr(impl)
{
  Q_D(LtsRangeSlider);
  d->init();
}


LtsRangeSlider::~LtsRangeSlider()
{
}


int LtsRangeSlider::minimumValue() const
{
  Q_D(const LtsRangeSlider);
  return d->m_minimumValue;
}


void LtsRangeSlider::setMinimumValue(int min)
{
  Q_D(LtsRangeSlider);
  setValues(min, qMax(d->m_maximumValue, min));
}


int LtsRangeSlider::maximumValue() const
{
  Q_D(const LtsRangeSlider);
  return d->m_maximumValue;
}


void LtsRangeSlider::setMaximumValue(int max)
{
  Q_D(LtsRangeSlider);
  setValues(qMin(d->m_minimumValue, max), max);
}


void LtsRangeSlider::setValues(int min, int max)
{
  Q_D(LtsRangeSlider);
  const int minValue = qBound(minimum(), qMin(min, max), maximum());
  const int maxValue = qBound(minimum(), qMax(min, max), maximum());
  bool emitMinValChanged = (minValue != d->m_minimumValue);
  bool emitMaxValChanged = (maxValue != d->m_maximumValue);

  d->m_minimumValue = minValue;
  d->m_maximumValue = maxValue;

  bool emitMinPosChanged = (minValue != d->m_minimumPosition);
  bool emitMaxPosChanged = (maxValue != d->m_maximumPosition);
  d->m_minimumPosition = minValue;
  d->m_maximumPosition = maxValue;

  if (isSliderDown())
  {
    if (emitMinPosChanged || emitMaxPosChanged)
      emit positionsChanged(d->m_minimumPosition, d->m_maximumPosition);
    if (emitMinPosChanged)
      emit minimumPositionChanged(d->m_minimumPosition);
    if (emitMaxPosChanged)
      emit maximumPositionChanged(d->m_maximumPosition);
  }
  if (emitMinValChanged || emitMaxValChanged)
    emit valuesChanged(d->m_minimumValue, d->m_maximumValue);

  if (emitMinValChanged)
    emit minimumValueChanged(d->m_minimumValue);

  if (emitMaxValChanged)
    emit maximumValueChanged(d->m_maximumValue);

  if (emitMinPosChanged || emitMaxPosChanged ||
      emitMinValChanged || emitMaxValChanged)
    update();
}


int LtsRangeSlider::minimumPosition() const
{
  Q_D(const LtsRangeSlider);
  return d->m_minimumPosition;
}


int LtsRangeSlider::maximumPosition() const
{
  Q_D(const LtsRangeSlider);
  return d->m_maximumPosition;
}


void LtsRangeSlider::setMinimumPosition(int min)
{
  Q_D(const LtsRangeSlider);
  setPositions(min, qMax(min, d->m_maximumPosition));
}


void LtsRangeSlider::setMaximumPosition(int max)
{
  Q_D(const LtsRangeSlider);
  setPositions(qMin(d->m_minimumPosition, max), max);
}


void LtsRangeSlider::setPositions(int min, int max)
{
  Q_D(LtsRangeSlider);
  const int minPosition = qBound(minimum(), qMin(min, max), maximum());
  const int maxPosition = qBound(minimum(), qMax(min, max), maximum());

  bool emitMinPosChanged = (minPosition != d->m_minimumPosition);
  bool emitMaxPosChanged = (maxPosition != d->m_maximumPosition);

  if (!emitMinPosChanged && !emitMaxPosChanged)
    return;

  d->m_minimumPosition = minPosition;
  d->m_maximumPosition = maxPosition;

  if (!hasTracking())
    update();

  if (isSliderDown())
  {
    if (emitMinPosChanged)
      emit minimumPositionChanged(d->m_minimumPosition);
    if (emitMaxPosChanged)
      emit maximumPositionChanged(d->m_maximumPosition);
    if (emitMinPosChanged || emitMaxPosChanged)
      emit positionsChanged(d->m_minimumPosition, d->m_maximumPosition);
  }
  if (hasTracking())
  {
    triggerAction(SliderMove);
    setValues(d->m_minimumPosition, d->m_maximumPosition);
  }
}


void LtsRangeSlider::setSymmetricMoves(bool symmetry)
{
  Q_D(LtsRangeSlider);
  d->m_symmetricMoves = symmetry;
}


bool LtsRangeSlider::symmetricMoves() const
{
  Q_D(const LtsRangeSlider);
  return d->m_symmetricMoves;
}


void LtsRangeSlider::onRangeChanged(int minimum, int maximum)
{
  Q_UNUSED(minimum);
  Q_UNUSED(maximum);
  Q_D(LtsRangeSlider);
  setValues(d->m_minimumValue, d->m_maximumValue);
}



void LtsRangeSlider::paintEvent(QPaintEvent *)
{
  Q_D(LtsRangeSlider);
  QStyleOptionSlider option;
  initStyleOption(&option);

  QStylePainter painter(this);

  
  
  
  painter.setPen(Qt::lightGray);
  if (option.orientation == Qt::Horizontal)
  {
    painter.drawLine(option.rect.left(), option.rect.top(), option.rect.left(), option.rect.bottom());
    painter.drawRect(option.rect.left(), option.rect.center().y() - 1, option.rect.right() - option.rect.left(), 3);
    painter.drawLine(option.rect.right(), option.rect.top(), option.rect.right(), option.rect.bottom());
  }
  else
  {
    painter.drawLine(option.rect.left(), option.rect.top(), option.rect.right(), option.rect.top());
    painter.drawRect(option.rect.center().x() - 1, option.rect.top(), 3, option.rect.top() - option.rect.bottom());
    painter.drawLine(option.rect.center().x(), option.rect.top(), option.rect.center().x(), option.rect.bottom());
    painter.drawLine(option.rect.left(), option.rect.bottom(), option.rect.right(), option.rect.bottom());
  }
  

  option.subControls = QStyle::SC_SliderGroove;
  
  
  
  option.sliderValue    = minimum() - maximum();
  option.sliderPosition = minimum() - maximum();
  option.subControls &= ~QStyle::SC_SliderGroove;
  painter.drawComplexControl(QStyle::CC_Slider, option);
  option.subControls |= QStyle::SC_SliderGroove;

  option.sliderPosition = d->m_minimumPosition;
  const QRect lr = style()->subControlRect(QStyle::CC_Slider,
                                           &option,
                                           QStyle::SC_SliderHandle,
                                           this);

  option.sliderPosition = d->m_maximumPosition;
  const QRect ur = style()->subControlRect(QStyle::CC_Slider,
                                           &option,
                                           QStyle::SC_SliderHandle,
                                           this);

  QRect sr = style()->subControlRect(QStyle::CC_Slider,
                                     &option,
                                     QStyle::SC_SliderGroove,
                                     this);
  QRect rangeBox;
  if (option.orientation == Qt::Horizontal)
  {
    rangeBox = QRect(QPoint(qMin(lr.center().x(), ur.center().x()), sr.center().y() - 2),
                     QPoint(qMax(lr.center().x(), ur.center().x()), sr.center().y() + 1));
  }
  else
  {
    rangeBox = QRect(QPoint(sr.center().x() - 2, qMin(lr.center().y(), ur.center().y())),
                     QPoint(sr.center().x() + 1, qMax(lr.center().y(), ur.center().y())));
  }

  
  
  
  QRect groove = style()->subControlRect(QStyle::CC_Slider,
                                         &option,
                                         QStyle::SC_SliderGroove,
                                         this);
  groove.adjust(0, 0, -1, 0);

  
  
  QColor highlight = palette().color(QPalette::Normal, QPalette::Highlight);
  QLinearGradient gradient;
  if (option.orientation == Qt::Horizontal)
    gradient = QLinearGradient(groove.center().x(), groove.top(), groove.center().x(), groove.bottom());
  else
    gradient = QLinearGradient(groove.left(), groove.center().y(), groove.right(), groove.center().y());

  
  
  

  gradient.setColorAt(0, highlight.darker(120));
  gradient.setColorAt(1, highlight.lighter(160));

  painter.setPen(QPen(highlight.darker(150), 0));
  painter.setBrush(gradient);
  painter.drawRect(rangeBox.intersected(groove));

  
  
  
  if (isMinimumSliderDown())
  {
    painter.setClipRect(ur);
    d->drawMaximumSlider(&painter);
    painter.setClipRect(lr);
    d->drawMinimumSlider(&painter);
  }
  else
  {
    painter.setClipRect(lr);
    d->drawMinimumSlider(&painter);
    painter.setClipRect(ur);
    d->drawMaximumSlider(&painter);
  }
}



void LtsRangeSlider::mousePressEvent(QMouseEvent *ev)
{
  Q_D(LtsRangeSlider);
  if (minimum() == maximum() || (ev->buttons() ^ ev->button()))
  {
    ev->ignore();
    return;
  }
  int mepos = orientation() == Qt::Horizontal ? ev->pos().x() : ev->pos().y();

  QStyleOptionSlider option;
  initStyleOption(&option);

  QRect handleRect;
  LtsRangeSliderPrivate::Handle handle_ = d->handleAtPos(ev->pos(), handleRect);

  if (handle_ != LtsRangeSliderPrivate::NoHandle)
  {
    if (ev->buttons() == Qt::RightButton)
    {
      d->m_subclassPosition    = (d->m_minimumPosition + d->m_maximumPosition) / 2.;
      d->m_subclassClickOffset =  mepos - d->pixelPosFromRangeValue(d->m_subclassPosition);
      d->m_subclassWidth       = (d->m_maximumPosition - d->m_minimumPosition) / 2.;
      
      setSliderDown(true);
      if (!isMinimumSliderDown() || !isMaximumSliderDown())
      {
        d->m_selectedHandles = QFlags<LtsRangeSliderPrivate::Handle>(LtsRangeSliderPrivate::MinimumHandle) |
                               QFlags<LtsRangeSliderPrivate::Handle>(LtsRangeSliderPrivate::MaximumHandle);
        QRect sr = style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderGroove, this);
        update(handleRect.united(sr));
      }
      ev->accept();
      return;
    }

    d->m_subclassPosition = (handle_ == LtsRangeSliderPrivate::MinimumHandle) ? d->m_minimumPosition : d->m_maximumPosition;

    
    d->m_subclassClickOffset = mepos - (orientation() == Qt::Horizontal ? handleRect.left() : handleRect.top());

    setSliderDown(true);

    if (d->m_selectedHandles != handle_)
    {
      d->m_selectedHandles = handle_;
      update(handleRect);
    }
    
    ev->accept();
    return;
  }

  
  

  QStyle::SubControl control = style()->hitTestComplexControl(QStyle::CC_Slider, &option, ev->pos(), this);
  QRect sr = style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderGroove, this);
  int minCenter = (orientation() == Qt::Horizontal ? handleRect.left() : handleRect.top());
  int maxCenter = (orientation() == Qt::Horizontal ? handleRect.right() : handleRect.bottom());
  if (control == QStyle::SC_SliderGroove && mepos > minCenter && mepos < maxCenter)
  {
    
    d->m_subclassPosition    = (d->m_minimumPosition + d->m_maximumPosition) / 2.;
    d->m_subclassClickOffset =  mepos - d->pixelPosFromRangeValue(d->m_subclassPosition);
    d->m_subclassWidth       = (d->m_maximumPosition - d->m_minimumPosition) / 2.;
    
    setSliderDown(true);
    if (!isMinimumSliderDown() || !isMaximumSliderDown())
    {
      d->m_selectedHandles = QFlags<LtsRangeSliderPrivate::Handle>(LtsRangeSliderPrivate::MinimumHandle) |
                             QFlags<LtsRangeSliderPrivate::Handle>(LtsRangeSliderPrivate::MaximumHandle);
      update(handleRect.united(sr));
    }
    ev->accept();
    return;
  }
  ev->ignore();
}



void LtsRangeSlider::mouseMoveEvent(QMouseEvent *ev)
{
  Q_D(LtsRangeSlider);
  if (!d->m_selectedHandles)
  {
    ev->ignore();
    return;
  }
  int mepos = orientation() == Qt::Horizontal ? ev->pos().x() : ev->pos().y();

  QStyleOptionSlider option;
  initStyleOption(&option);

  
  if (isMinimumSliderDown() && isMaximumSliderDown())
  {
    int newPosition = d->pixelPosToRangeValue(mepos);
    int newMinPosition = newPosition - static_cast<int>(d->m_subclassWidth);
    int newMaxPosition = newPosition + static_cast<int>(d->m_subclassWidth + .5);
    
    if (newMinPosition < minimum())
    {
      newMinPosition = minimum();
      newMaxPosition = newMinPosition + (d->m_maximumPosition - d->m_minimumPosition);
    }
    else if (newMaxPosition > maximum())
    {
      newMaxPosition = maximum();
      newMinPosition = newMaxPosition - (d->m_maximumPosition - d->m_minimumPosition);
    }
    setPositions(newMinPosition, newMaxPosition);
    ev->accept();
    return;
  }

  const int m = style()->pixelMetric(QStyle::PM_MaximumDragDistance, &option, this);

  int newPosition = d->pixelPosToRangeValue(mepos - d->m_subclassClickOffset);

  if (m >= 0)
  {
    const QRect r = rect().adjusted(-m, -m, m, m);
    if (!r.contains(ev->pos()))
      newPosition = d->m_subclassPosition;
  }

  
  if (isMinimumSliderDown() && !isMaximumSliderDown())
  {
    double newMinPos = qMin(newPosition, d->m_maximumPosition);
    setPositions(newMinPos, d->m_maximumPosition + (d->m_symmetricMoves ? d->m_minimumPosition - newMinPos : 0));
  }
  
  else if (isMaximumSliderDown() && !isMinimumSliderDown())
  {
    double newMaxPos = qMax(d->m_minimumPosition, newPosition);
    setPositions(d->m_minimumPosition - (d->m_symmetricMoves ? newMaxPos - d->m_maximumPosition : 0), newMaxPos);
  }
  ev->accept();
}



void LtsRangeSlider::mouseReleaseEvent(QMouseEvent *ev)
{
  Q_D(LtsRangeSlider);
  QSlider::mouseReleaseEvent(ev);

  setSliderDown(false);
  d->m_selectedHandles = {};

  update();
}


bool LtsRangeSlider::isMinimumSliderDown() const
{
  Q_D(const LtsRangeSlider);
  return d->m_selectedHandles & LtsRangeSliderPrivate::MinimumHandle;
}


bool LtsRangeSlider::isMaximumSliderDown() const
{
  Q_D(const LtsRangeSlider);
  return d->m_selectedHandles & LtsRangeSliderPrivate::MaximumHandle;
}


void LtsRangeSlider::initMinimumSliderStyleOption(QStyleOptionSlider *option) const
{
  initStyleOption(option);
}


void LtsRangeSlider::initMaximumSliderStyleOption(QStyleOptionSlider *option) const
{
  initStyleOption(option);
}


QString LtsRangeSlider::handleToolTip()const
{
  Q_D(const LtsRangeSlider);
  return d->m_handleToolTip;
}


void LtsRangeSlider::setHandleToolTip(const QString &toolTip)
{
  Q_D(LtsRangeSlider);
  d->m_handleToolTip = toolTip;
}


bool LtsRangeSlider::event(QEvent *event)
{
  Q_D(LtsRangeSlider);
  switch (event->type())
  {
  case QEvent::ToolTip:
  {
    QHelpEvent *helpEvent = static_cast<QHelpEvent *>(event);
    QStyleOptionSlider opt;
    
    opt.sliderPosition = d->m_minimumPosition;
    opt.sliderValue = d->m_minimumValue;
    initStyleOption(&opt);
    QStyle::SubControl hoveredControl = style()->hitTestComplexControl(QStyle::CC_Slider, &opt, helpEvent->pos(), this);
    if (!d->m_handleToolTip.isEmpty() && hoveredControl == QStyle::SC_SliderHandle)
    {
      QToolTip::showText(helpEvent->globalPos(), d->m_handleToolTip.arg(minimumValue()));
      event->accept();
      return true;
    }
    
    opt.sliderPosition = d->m_maximumPosition;
    opt.sliderValue = d->m_maximumValue;
    initStyleOption(&opt);
    hoveredControl = style()->hitTestComplexControl(QStyle::CC_Slider, &opt, helpEvent->pos(), this);
    if (!d->m_handleToolTip.isEmpty() && hoveredControl == QStyle::SC_SliderHandle)
    {
      QToolTip::showText(helpEvent->globalPos(), d->m_handleToolTip.arg(maximumValue()));
      event->accept();
      return true;
    }
  }
  default:
    break;
  }
  return QSlider::event(event);
}

}