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

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        ** This file is part of the documentation of the Qt Toolkit.
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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