Method paintSection

Src/CheckBoxHeader.cpp:115–158

}

void CCheckBoxHeader::paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const
{
    if (!isCheckable(logicalIndex) || isSectionHidden(logicalIndex)) {
        QHeaderView::paintSection(painter, rect, logicalIndex);
        return;
    }

    // 1) 绘制默认背景
    painter->save();
    QStyleOptionHeader option;
    option.initFrom(this);
    option.rect = rect;
    option.section = logicalIndex;
    option.orientation = this->orientation();
    style()->drawControl(QStyle::CE_Header, &option, painter, this);
    painter->restore();

    // 2) 如果该列可显示复选框，绘制复选框
    QRect cbRect = CheckboxRect(rect);
    DrawCheckBox(painter, cbRect, GetCheckState(logicalIndex), true);

    // 3) 绘制文本（在复选框右侧留出间距）
    QString text;
    if (model()) {
        QVariant v = model()->headerData(logicalIndex, Qt::Horizontal, Qt::DisplayRole);
        text = v.isValid() ? v.toString() : QString();
    }
    if (!text.isEmpty()) {
        // 调整文本区域（避开复选框）
        int textLeft = cbRect.right() + 4; // 复选框右边留4像素间距
        QRect textRect(textLeft, rect.top(), rect.width() - (textLeft - rect.left()), rect.height());
        // 绘制文本
        QVariant vAlign = model() ? model()->headerData(
                                        logicalIndex, orientation(),
                                        Qt::TextAlignmentRole)
                                  : Qt::AlignLeft;
        Qt::Alignment alignment = Qt::AlignCenter;
        if(vAlign.isValid())
            alignment = (Qt::Alignment)vAlign.toInt();
        this->DrawText(painter, textRect, text, alignment);
    }

    return;
}

void CCheckBoxHeader::DrawCheckBox(QPainter* painter, const QRect& rect,
                                   Qt::CheckState state, bool enabled) const