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    41 

    42 #ifndef TICTACTOE_H

    43 #define TICTACTOE_H

    44 

    45 #include <QWidget>

    46 

    47 QT_BEGIN_NAMESPACE

    48 class QRect;

    49 class QSize;

    50 QT_END_NAMESPACE

    51 

    52 //! [0]

    53 class TicTacToe : public QWidget

    54 {

    55     Q_OBJECT

    56     Q_PROPERTY(QString state READ state WRITE setState)

    57 

    58 public:

    59     TicTacToe(QWidget *parent = 0);

    60 

    61     QSize minimumSizeHint() const;

    62     QSize sizeHint() const;

    63     void setState(const QString &newState);

    64     QString state() const;

    65     void clearBoard();

    66 

    67 protected:

    68     void mousePressEvent(QMouseEvent *event);

    69     void paintEvent(QPaintEvent *event);

    70 

    71 private:

    72     enum { Empty = '-', Cross = 'X', Nought = 'O' };

    73 

    74     QRect cellRect(int row, int col) const;

    75     int cellWidth() const { return width() / 3; }

    76     int cellHeight() const { return height() / 3; }

    77 

    78     QString myState;

    79     int turnNumber;

    80 };

    81 //! [0]

    82 

    83 #endif