void ShareeSignatureDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const {        // 沿用父类的绘制效果    QStyledItemDelegate::paint(painter, option, index);    painter->save();        // 从mode的data接口里根据role获取姓名和签名内容(NameRole,SignatureRole为data接口里自定义的角色名)    QString sharerName = index.data(NameRole).toString();    QString signature = index.data(SignatureRole).toString();    QStyleOptionViewItemV4 optV4 = option;    initStyleOption(&optV4, index);    const QWidget *widget = optV4.widget;    QStyle *style = widget ? widget->style() : QApplication::style();    QRect rect = style->subElementRect(QStyle::SE_ItemViewItemText, &optV4, widget);        // 定义起始位置    rect = rect.adjusted(5, 0, 0, - optV4.rect.height() / 2);        // 设置文字的长度，以及文字过长时的省略模式    QFontMetrics fontMetrics = painter->fontMetrics();    QString elidedNameLine = fontMetrics.elidedText(sharerName, Qt::ElideMiddle, rect.width());    QString elidedSignatureLine = fontMetrics.elidedText(signature, Qt::ElideMiddle, rect.width());        // 执行文字绘制    style->drawItemText(painter, rect, Qt::AlignBottom, QApplication::palette(), true, elidedNameLine);        // 设置签名内容的位置，使得该内容在姓名的下方    rect.moveTop(rect.bottom());    painter->setPen(QColor("#949fa5"));    if(!signature.isEmpty())        style->drawItemText(painter, rect, Qt::AlignVCenter, QApplication::palette(), true, elidedSignatureLine);    else        style->drawItemText(painter, rect, Qt::AlignVCenter, QApplication::palette(), true, "无T签?名?信?息￠");    painter->restore();}