通过QStyledItemDelegate以不同的颜色显示QTableWidgetItem的文本

#include <QStyledItemDelegate>
#include <QPainter>

class ColorDelegate : public QStyledItemDelegate
{
public:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        if (index.isValid()) {
            QString text = index.data(Qt::DisplayRole).toString();
            QColor color;

            // 根据文本内容设置不同的颜色
            if (text.contains("重要")) {
                color = Qt::red;
            } else if (text.contains("普通")) {
                color = Qt::blue;
            } else {
                color = Qt::black;
            }

            painter->save();
            painter->setPen(color);
            painter->drawText(option.rect, Qt::AlignLeft | Qt::AlignVCenter, text);
            painter->restore();
        } else {
            QStyledItemDelegate::paint(painter, option, index);
        }
    }

    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        return QStyledItemDelegate::sizeHint(option, index);
    }
};

QTableView *tableView = new QTableView;
tableView->setItemDelegateForColumn(0, new ColorDelegate);