自定义 QHeaderView 绘制 QCheckBox (可配置样式的 QCheckBox)

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class SCheckBoxHeaderView : public QHeaderView
{
	Q_OBJECT
private:
	bool isChecked;
	int m_checkColIdx;
public:
	SCheckBoxHeaderView(int checkColumnIndex, Qt::Orientation orientation, QWidget * parent = 0) :
		QHeaderView(orientation, parent) {
		m_checkColIdx = checkColumnIndex;
		isChecked = false;
	}
signals:
	void checkStausChange(bool);
protected:
	void paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const {
		painter->save();
		QHeaderView::paintSection(painter, rect, logicalIndex);
    if (logicalIndex == m_checkColIdx) {
      QStyleOptionButton option;
      // checkBox 需要设置 parent 后方便通过全局stylesheet 设置 checkBox 样式（大小似乎无法通过样式设置)
      QCheckBox *checkBox = new QCheckBox(dynamic_cast<QWidget *>(this->parent()));
      // QRect(x, y, width, height) 控制绘制的 QCheckBox 位置与大小 （注：大小可能偏大，需要自行尝试）
      option.rect = QRect(3, 5, 21, 21);
      if (isChecked)
        option.state = QStyle::State_On;
      else
        option.state = QStyle::State_Off;
      this->style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &option, painter, checkBox);
    }
	}
	void mousePressEvent(QMouseEvent *event) {
		if (visualIndexAt(event->pos().x()) == m_checkColIdx) {
			isChecked = !isChecked;
			this->updateSection(m_checkColIdx);
			emit checkStausChange(isChecked);
		}
		QHeaderView::mousePressEvent(event);
	}
};