二十一、继承QStyledItemDelegate单元格选定没有背景色的解决办法

#ifndef DD_H
#define DD_H

#include <QStyledItemDelegate>

class DD : public QStyledItemDelegate
{
public:
    DD();
    
    // QAbstractItemDelegate interface
public:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE;
};

#endif // DD_H

void DD::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QTextOption op;
    op.setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
    QFont font;
    font.setFamily("Microsoft YaHei");
    font.setPixelSize(14);
    painter->setFont(font);
    //判断当前 item 是否选中
    if (option.state & QStyle::State_Selected) {
        //当前 item 被选中，高亮
//        painter->fillRect(option.rect, option.palette.highlight());
        //自定义选中背景色
        painter->fillRect(option.rect, QBrush(Qt::gray));
    }

    painter->drawText(option.rect, index.data(Qt::DisplayRole).toString(), op);
}