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# tictactoe.cpp Example File
designer/taskmenuextension/tictactoe.cpp

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        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
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        ** http://www.trolltech.com/products/qt/opensource.html
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        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
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        **
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        #include <QtGui>

        #include "tictactoe.h"

        TicTacToe::TicTacToe(QWidget *parent)
            :QWidget(parent)
        {}

        QSize TicTacToe::minimumSizeHint() const
        {
            return QSize(200, 200);
        }

        QSize TicTacToe::sizeHint() const
        {
            return QSize(200, 200);
        }

        void TicTacToe::setState(const QString &newState)
        {
            turnNumber = 0;
            for (int position = 0; position < 9; ++position) {
                if (newState.at(position) != Empty)
                    ++turnNumber;
            }
            myState = newState;
            update();
        }

        QString TicTacToe::state() const
        {
            return myState;
        }

        void TicTacToe::clearBoard()
        {
            myState = "---------";
            turnNumber = 0;
            update();
        }

        void TicTacToe::mousePressEvent(QMouseEvent *event)
        {
            if (turnNumber == 9) {
                clearBoard();
                update();
            } else {
                for (int position = 0; position < 9; ++position) {

                    QRect cell = cellRect(position / 3, position % 3);
                    if (cell.contains(event->pos())) {
                        if (myState.at(position) == Empty) {
                            if (turnNumber % 2 == 0)
                                myState.replace(position, 1, Cross);
                            else
                                myState.replace(position, 1, Nought);
                            ++turnNumber;
                            update();
                        }
                    }
                }
            }
        }

        void TicTacToe::paintEvent(QPaintEvent *)
        {
            QPainter painter(this);
            painter.setRenderHint(QPainter::Antialiasing);

            painter.setPen(QPen(Qt::darkGreen, 1));
            painter.drawLine(cellWidth(), 0, cellWidth(), height());
            painter.drawLine(2 * cellWidth(), 0, 2 * cellWidth(), height());
            painter.drawLine(0, cellHeight(), width(), cellHeight());
            painter.drawLine(0, 2 * cellHeight(), width(), 2 * cellHeight());

            painter.setPen(QPen(Qt::darkBlue, 2));

            for (int position = 0; position < 9; ++position) {

                QRect cell = cellRect(position / 3, position % 3);

                if (myState.at(position) == Cross) {
                    painter.drawLine(cell.topLeft(), cell.bottomRight());
                    painter.drawLine(cell.topRight(), cell.bottomLeft());
                } else if (myState.at(position) == Nought) {
                    painter.drawEllipse(cell);
                }
            }

            painter.setPen(QPen(Qt::yellow, 3));

            for (int position = 0; position < 9; position = position + 3) {
                if (myState.at(position) != Empty
                        && myState.at(position + 1) == myState.at(position)
                        && myState.at(position + 2) == myState.at(position)) {
                    int y = cellRect((position / 3), 0).center().y();
                    painter.drawLine(0, y, width(), y);
                    turnNumber = 9;
                }
            }

            for (int position = 0; position < 3; ++position) {
                if (myState.at(position) != Empty
                        && myState.at(position + 3) == myState.at(position)
                        && myState.at(position + 6) == myState.at(position)) {
                    int x = cellRect(0, position).center().x();
                    painter.drawLine(x, 0, x, height());
                    turnNumber = 9;
                }
            }
            if (myState.at(0) != Empty && myState.at(4) == myState.at(0)
                    && myState.at(8) == myState.at(0)) {
                painter.drawLine(0, 0, width(), height());
                turnNumber = 9;
            }
            if (myState.at(2) != Empty && myState.at(4) == myState.at(2)
                    && myState.at(6) == myState.at(2)) {
                painter.drawLine(0, height(), width(), 0);
                turnNumber = 9;
            }
        }

        QRect TicTacToe::cellRect(int row, int column) const
        {
            const int HMargin = width() / 30;
            const int VMargin = height() / 30;
            return QRect(column * cellWidth() + HMargin,
                         row * cellHeight() + VMargin,
                         cellWidth() - 2 * HMargin,
                         cellHeight() - 2 * VMargin);
        }