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