gameoflifemodel.cpp Example File

tableview/gameoflife/gameoflifemodel.cpp
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#include "gameoflifemodel.h" #include <QFile> #include <QTextStream> #include <QRect> GameOfLifeModel::GameOfLifeModel(QObject *parent) : QAbstractTableModel(parent) { clear(); } int GameOfLifeModel::rowCount(const QModelIndex &parent) const { if (parent.isValid()) return 0; return height; } int GameOfLifeModel::columnCount(const QModelIndex &parent) const { if (parent.isValid()) return 0; return width; } QVariant GameOfLifeModel::data(const QModelIndex &index, int role) const { if (!index.isValid() || role != CellRole) return QVariant(); return QVariant(m_currentState[cellIndex({index.column(), index.row()})]); } bool GameOfLifeModel::setData(const QModelIndex &index, const QVariant &value, int role) { if (role != CellRole || data(index, role) == value) return false; m_currentState[cellIndex({index.column(), index.row()})] = value.toBool(); emit dataChanged(index, index, {role}); return true; } Qt::ItemFlags GameOfLifeModel::flags(const QModelIndex &index) const { if (!index.isValid()) return Qt::NoItemFlags; return Qt::ItemIsEditable; } void GameOfLifeModel::nextStep() { StateContainer newValues; for (std::size_t i = 0; i < size; ++i) { bool currentState = m_currentState[i]; int cellNeighborsCount = this->cellNeighborsCount(cellCoordinatesFromIndex(static_cast<int>(i))); newValues[i] = currentState == true ? cellNeighborsCount == 2 || cellNeighborsCount == 3 : cellNeighborsCount == 3; } m_currentState = std::move(newValues); emit dataChanged(index(0, 0), index(height - 1, width - 1), {CellRole}); } bool GameOfLifeModel::loadFile(const QString &fileName) { QFile file(fileName); if (!file.open(QIODevice::ReadOnly)) return false; QTextStream in(&file); loadPattern(in.readAll()); return true; } void GameOfLifeModel::loadPattern(const QString &plainText) { clear(); QStringList rows = plainText.split("\n"); QSize patternSize(0, rows.count()); for (QString row : rows) { if (row.size() > patternSize.width()) patternSize.setWidth(row.size()); } QPoint patternLocation((width - patternSize.width()) / 2, (height - patternSize.height()) / 2); for (int y = 0; y < patternSize.height(); ++y) { const QString line = rows[y]; for (int x = 0; x < line.length(); ++x) { QPoint cellPosition(x + patternLocation.x(), y + patternLocation.y()); m_currentState[cellIndex(cellPosition)] = line[x] == 'O'; } } emit dataChanged(index(0, 0), index(height - 1, width - 1), {CellRole}); } void GameOfLifeModel::clear() { m_currentState.fill(false); emit dataChanged(index(0, 0), index(height - 1, width - 1), {CellRole}); } int GameOfLifeModel::cellNeighborsCount(const QPoint &cellCoordinates) const { int count = 0; for (int x = -1; x <= 1; ++x) { for (int y = -1; y <= 1; ++y) { if (x == 0 && y == 0) continue; const QPoint neighborPosition { cellCoordinates.x() + x, cellCoordinates.y() + y }; if (!areCellCoordinatesValid(neighborPosition)) continue; if (m_currentState[cellIndex(neighborPosition)]) ++count; if (count > 3) return count; } } return count; } bool GameOfLifeModel::areCellCoordinatesValid(const QPoint &coordinates) { return QRect(0, 0, width, height).contains(coordinates); } QPoint GameOfLifeModel::cellCoordinatesFromIndex(int cellIndex) { return {cellIndex % width, cellIndex / width}; } std::size_t GameOfLifeModel::cellIndex(const QPoint &coordinates) { return std::size_t(coordinates.y() * width + coordinates.x()); }