使用QItemDelegate更改QCalendarWidget的日期位置后无法使用PaintCell

#include <QItemDelegate>
#include <QCalendarWidget>
#include <QPainter>

class CustomItemDelegate : public QItemDelegate
{
public:
    CustomItemDelegate(QObject *parent = nullptr) : QItemDelegate(parent) {}

    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        // Retrieve date information from the model
        QDate date = index.data(Qt::DisplayRole).toDate();

        // Calculate the desired position of the date
        QPoint position = option.rect.topLeft() + QPoint(10, 10);

        // Draw the date at the desired position
        painter->drawText(position, date.toString(Qt::SystemLocaleShortDate));
    }
};

// Usage example
QCalendarWidget *calendarWidget = new QCalendarWidget;
calendarWidget->setItemDelegate(new CustomItemDelegate);