Qt自定义表头实现过滤功能的方法

void CFilterHeaderView::mouseMoveEvent(QMouseEvent *e)
{
  m_hover = logicalIndexAt(e->pos());
  if (m_hover != -1)
    updateSection(m_hover);
  QHeaderView::mouseMoveEvent(e);
}

bool CFilterHeaderView::event(QEvent *e)
{
  switch(e->type())
  {
  case QEvent::Leave:
  case QEvent::HoverLeave:
    if (m_hover != -1)
      updateSection(m_hover);
    m_hover = -1;
    break;
  default:
    break;
  }
  return QHeaderView::event(e);
}

void CFilterHeaderView::mousePressEvent(QMouseEvent *e)
{
  m_press = logicalIndexAt(e->pos());
  if (m_press != -1)
    updateSection(m_press);
  QHeaderView::mousePressEvent(e);
}

void CFilterHeaderView::mouseReleaseEvent(QMouseEvent *e)
{
  m_press = -1;
  QHeaderView::mouseReleaseEvent(e);
}

void CFilterHeaderView::paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const
{
  painter->save();
  QHeaderView::paintSection(painter, rect, logicalIndex);
  painter->restore();

  QVariant filterVar = model()->headerData(logicalIndex, orientation(), FilterRole);
  if (filterVar.isValid() && filterVar.toBool())
  {
    QPixmap pix = m_norFilterPix;
    bool b_contain = getFilterRect(rect).contains(cursor().pos());
    if (logicalIndex == m_hover && b_contain)
    {
      pix = m_hovFilterPix;
    }
    if (logicalIndex == m_press && b_contain)
    {
      pix = m_preFilterPix;
    }

    int align = Qt::AlignRight | Qt::AlignVCenter;
    QVariant alignVar = model()->headerData(logicalIndex, orientation(), FilterAlignmentRole);
    if (alignVar.isValid())
    {
      align = alignVar.toInt();
    }
    style()->drawItemPixmap(painter, rect, align, pix);
  }
}

void CFilterHeaderView::mouseReleaseEvent(QMouseEvent *e)
{
  if (e->button() == Qt::LeftButton)
  {
    int section = logicalIndexAt(e->pos());
    QVariant filterVar = model()->headerData(section, orientation(), FilterRole);
    if (filterVar.isValid() && filterVar.toBool())
    {
      QRect rect(sectionViewportPosition(section), 0, sectionSize(section), height());
      if (getFilterRect(rect).contains(cursor().pos()))
      {
        emit filterClicked(section);
      }
    }
  }
  QHeaderView::mouseReleaseEvent(e);
}

m_tableView = new QTableView(this);
  m_model = new QStandardItemModel(this);
  m_filterModel = new QSortFilterProxyModel(this);
  m_filterModel->setSourceModel(m_model);
  m_filterModel->setSortRole(Qt::ToolTipRole);
  m_tableView->setModel(m_filterModel);

  QHBoxLayout* mainLayout = new QHBoxLayout(this);
  mainLayout->setMargin(0);
  mainLayout->addWidget(m_tableView);
  setLayout(mainLayout);

  m_tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
  m_tableView->setSelectionMode(QAbstractItemView::SingleSelection);
  m_tableView->setSelectionBehavior(QAbstractItemView::SelectRows);

  m_tableView->verticalHeader()->hide();
  CFilterHeaderView* pHeader = new CFilterHeaderView(this);
  connect(pHeader, &CFilterHeaderView::filterClicked, this, &Widget::onFilterClicked);
  m_tableView->setHorizontalHeader(pHeader);