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

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 #ifndef SPREADSHEET_H
 #define SPREADSHEET_H

 #include <QMainWindow>

 class QAction;
 class QLabel;
 class QLineEdit;
 class QToolBar;
 class QTableWidgetItem;
 class QTableWidget;

 class SpreadSheet : public QMainWindow
 {
     Q_OBJECT

 public:

     SpreadSheet(int rows, int cols, QWidget *parent = 0);

 public slots:
     void updateStatus(QTableWidgetItem *item);
     void updateColor(QTableWidgetItem *item);
     void updateLineEdit(QTableWidgetItem *item);
     void returnPressed();
     void selectColor();
     void selectFont();
     void clear();
     void showAbout();

     void print();

     void actionSum();
     void actionSubtract();
     void actionAdd();
     void actionMultiply();
     void actionDivide();

 protected:
     void setupContextMenu();
     void setupContents();

     void setupMenuBar();
     void createActions();

     void actionMath_helper(const QString &title, const QString &op);
     bool runInputDialog(const QString &title,
                         const QString &c1Text,
                         const QString &c2Text,
                         const QString &opText,
                         const QString &outText,
                         QString *cell1, QString *cell2, QString *outCell);
 private:
     QToolBar *toolBar;
     QAction *colorAction;
     QAction *fontAction;
     QAction *firstSeparator;
     QAction *cell_sumAction;
     QAction *cell_addAction;
     QAction *cell_subAction;
     QAction *cell_mulAction;
     QAction *cell_divAction;
     QAction *secondSeparator;
     QAction *clearAction;
     QAction *aboutSpreadSheet;
     QAction *exitAction;

     QAction *printAction;

     QLabel *cellLabel;
     QTableWidget *table;
     QLineEdit *formulaInput;

 };

 void decode_pos(const QString &pos, int *row, int *col);
 QString encode_pos(int row, int col);

 #endif // SPREADSHEET_H