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spreadsheetitem.h Example File
demos/spreadsheet/spreadsheetitem.h

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 #ifndef SPREADSHEETITEM_H
 #define SPREADSHEETITEM_H

 #include <QTableWidgetItem>
 #include <QtGui>
 #include "spreadsheet.h"

 class SpreadSheetItem : public QTableWidgetItem
 {
 public:
     SpreadSheetItem();
     SpreadSheetItem(const QString &text);

     QTableWidgetItem *clone() const;

     QVariant data(int role) const;
     void setData(int role, const QVariant &value);
     QVariant display() const;

     inline QString formula() const
     { return QTableWidgetItem::data(Qt::DisplayRole).toString(); }

     static QVariant computeFormula(const QString &formula,
                                    const QTableWidget *widget,
                                    const QTableWidgetItem *self = 0);

 private:
     mutable bool isResolving;
 };

 #endif // SPREADSHEETITEM_H