factorial.hpp Example File

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    #ifndef FACTORIAL_HPP
    #define FACTORIAL_HPP

    #include <QtCore/QObject>

    /**
     * The Factorial class stores the values that are used to calculate the factorial.
     * It makes the current x value (x), the original x value (xorig) and the calculated
     * factorial (fac) available as properties, so that they can be accessed by the
     * states and transitions and also by the UI.
     */
    class Factorial : public QObject
    {
        Q_OBJECT

        // The value properties
        Q_PROPERTY(int x READ x WRITE setX NOTIFY xChanged)
        Q_PROPERTY(int xorig READ xorig WRITE setXorig NOTIFY xorigChanged)
        Q_PROPERTY(int fac READ fac WRITE setFac NOTIFY facChanged)

    public:
        Factorial(QObject *parent = 0);

        // The accessor methods for the value properties
        int x() const;
        void setX(int x);

        int xorig() const;
        void setXorig(int xorig);

        int fac() const;
        void setFac(int fac);

    Q_SIGNALS:
        // The change notification signals of the value properties
        void xChanged(int value);
        void xorigChanged(int value);
        void facChanged(int value);

    private:
        // The current x value
        int m_x;

        // The initial x value
        int m_xorig;

        // The calculated factorial
        int m_fac;
    };

    #endif