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# tetrixboard.h Example File
widgets/tetrix/tetrixboard.h

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     #ifndef TETRIXBOARD_H
     #define TETRIXBOARD_H

     #include <QBasicTimer>
     #include <QFrame>
     #include <QPointer>

     #include "tetrixpiece.h"

     class QLabel;

     class TetrixBoard : public QFrame
     {
         Q_OBJECT

     public:
         TetrixBoard(QWidget *parent = 0);

         void setNextPieceLabel(QLabel *label);
         QSize sizeHint() const;
         QSize minimumSizeHint() const;

     public slots:
         void start();
         void pause();

     signals:
         void scoreChanged(int score);
         void levelChanged(int level);
         void linesRemovedChanged(int numLines);

     protected:
         void paintEvent(QPaintEvent *event);
         void keyPressEvent(QKeyEvent *event);
         void timerEvent(QTimerEvent *event);

     private:
         enum { BoardWidth = 10, BoardHeight = 22 };

         TetrixShape &shapeAt(int x, int y) { return board[(y * BoardWidth) + x]; }
         int timeoutTime() { return 1000 / (1 + level); }
         int squareWidth() { return contentsRect().width() / BoardWidth; }
         int squareHeight() { return contentsRect().height() / BoardHeight; }
         void clearBoard();
         void dropDown();
         void oneLineDown();
         void pieceDropped(int dropHeight);
         void removeFullLines();
         void newPiece();
         void showNextPiece();
         bool tryMove(const TetrixPiece &newPiece, int newX, int newY);
         void drawSquare(QPainter &painter, int x, int y, TetrixShape shape);

         QBasicTimer timer;
         QPointer<QLabel> nextPieceLabel;
         bool isStarted;
         bool isPaused;
         bool isWaitingAfterLine;
         TetrixPiece curPiece;
         TetrixPiece nextPiece;
         int curX;
         int curY;
         int numLinesRemoved;
         int numPiecesDropped;
         int score;
         int level;
         TetrixShape board[BoardWidth * BoardHeight];
     };

     #endif