Qt 5.9 | Qt Designer Manual | Task Menu Extension Example | tictactoe.cpp Example File

Qt 5.9.2 Reference Documentation

# tictactoe.cpp Example File

taskmenuextension/tictactoe.cpp

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      #include "tictactoe.h"

      #include <QMouseEvent>
      #include <QPainter>

      static inline QString defaultState() { return QStringLiteral("---------"); }

      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;
          myState = defaultState();
          int position = 0;
          while (position < 9 && position < newState.length()) {
              QChar mark = newState.at(position);
              if (mark == Cross || mark == Nought) {
                  ++turnNumber;
                  myState.replace(position, 1, mark);
              }
              position++;
          }
          update();
      }

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

      void TicTacToe::clearBoard()
      {
          myState = defaultState();
          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 * /* event */)
      {
          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);
      }