mainwindow.cpp Example File

sudoku/mainwindow.cpp
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 #include "mainwindow.h"

 #include <QComboBox>
 #include <QDir>
 #include <QFile>
 #include <QGridLayout>
 #include <QLabel>
 #include <QScxmlStateMachine>
 #include <QStringListModel>
 #include <QTextStream>
 #include <QToolButton>

 static int Size = 9;

 QT_USE_NAMESPACE

 static QVariantList emptyRow()
 {
     QVariantList row;
     for (int i = 0; i < Size; i++)
         row.append(QVariant(0));
     return row;
 }

 static QVariantMap readSudoku(const QString &fileName)
 {
     QFile input(fileName);
     input.open(QIODevice::ReadOnly | QIODevice::Text);
     QTextStream str(&input);
     const QString data = str.readAll();

     QVariantList initRowsVariant;
     const QStringList rows = data.split(QLatin1Char('\n'));
     for (int i = 0; i < Size; i++) {
         if (i < rows.count()) {
             QVariantList initRowVariant;
             const QStringList row = rows.at(i).split(QLatin1Char(','));
             for (int j = 0; j < Size; j++) {
                 const int val = j < row.count()
                         ? row.at(j).toInt() % (Size + 1) : 0;
                 initRowVariant.append(val);
             }
             initRowsVariant.append(QVariant(initRowVariant));
         } else {
             initRowsVariant.append(QVariant(emptyRow()));
         }
     }

     QVariantMap dataVariant;
     dataVariant.insert(QStringLiteral("initState"), initRowsVariant);

     return dataVariant;
 }

 MainWindow::MainWindow(QScxmlStateMachine *machine, QWidget *parent) :
     QWidget(parent),
     m_machine(machine)
 {
     const QVector<QToolButton *> initVector(Size, nullptr);
     m_buttons = QVector<QVector<QToolButton *> >(Size, initVector);

     QGridLayout *layout = new QGridLayout(this);

     for (int i = 0; i < Size; i++) {
         for (int j = 0; j < Size; j++) {
             QToolButton *button = new QToolButton(this);
             button->setSizePolicy(QSizePolicy::Expanding,
                                   QSizePolicy::Expanding);
             layout->addWidget(button, i + i / 3, j + j / 3);
             m_buttons[i][j] = button;
             connect(button, &QToolButton::clicked, [this, i, j] () {
                 QVariantMap data;
                 data.insert(QStringLiteral("x"), i);
                 data.insert(QStringLiteral("y"), j);
                 m_machine->submitEvent("tap", data);
             });
         }
     }

     for (int i = 0; i < 3; i++) {
         for (int j = 0; j < 2; j++) {
             QFrame *hFrame = new QFrame(this);
             hFrame->setFrameShape(QFrame::HLine);
             layout->addWidget(hFrame, 4 * j + 3, 4 * i, 1, 3);

             QFrame *vFrame = new QFrame(this);
             vFrame->setFrameShape(QFrame::VLine);
             layout->addWidget(vFrame, 4 * i, 4 * j + 3, 3, 1);
         }
     }

     m_startButton = new QToolButton(this);
     m_startButton->setSizePolicy(QSizePolicy::Expanding,
                                  QSizePolicy::Expanding);
     m_startButton->setText(tr("Start"));
     layout->addWidget(m_startButton, Size + 3, 0, 1, 3);

     connect(m_startButton, &QAbstractButton::clicked,
             [this] {
         if (m_machine->isActive("playing"))
             m_machine->submitEvent("stop");
         else
             m_machine->submitEvent("start");
     });

     m_label = new QLabel(tr("unsolved"));
     m_label->setAlignment(Qt::AlignCenter);
     layout->addWidget(m_label, Size + 3, 4, 1, 3);

     m_undoButton = new QToolButton(this);
     m_undoButton->setSizePolicy(QSizePolicy::Expanding,
                                 QSizePolicy::Expanding);
     m_undoButton->setText(tr("Undo"));
     m_undoButton->setEnabled(false);
     layout->addWidget(m_undoButton, Size + 3, 8, 1, 3);

     connect(m_undoButton, &QAbstractButton::clicked,
             [this] {
         m_machine->submitEvent("undo");
     });

     m_chooser = new QComboBox(this);
     layout->addWidget(m_chooser, Size + 4, 0, 1, 11);

     QDir dataDir(QLatin1String(":/data"));
     QFileInfoList sudokuFiles = dataDir.entryInfoList(QStringList()
                                                       << "*.data");
     for (const QFileInfo &sudokuFile : sudokuFiles) {
         m_chooser->addItem(sudokuFile.completeBaseName(),
                            sudokuFile.absoluteFilePath());
     }

     connect(m_chooser, QOverload<int>::of(&QComboBox::currentIndexChanged),
             [this] (int index) {
         const QString sudokuFile = m_chooser->itemData(index).toString();
         const QVariantMap initValues = readSudoku(sudokuFile);
         m_machine->submitEvent("setup", initValues);
     });

     const QVariantMap initValues = readSudoku(
                 m_chooser->itemData(0).toString());
     m_machine->setInitialValues(initValues);

     m_machine->connectToState("playing", [this] (bool playing) {
         if (playing) {
             m_startButton->setText(tr("Stop"));
             m_undoButton->setEnabled(true);
             m_chooser->setEnabled(false);
         } else {
             m_startButton->setText(tr("Start"));
             m_undoButton->setEnabled(false);
             m_chooser->setEnabled(true);
         }
     });

     m_machine->connectToState("solved", [this] (bool solved) {
         if (solved)
             m_label->setText(tr("SOLVED !!!"));
         else
             m_label->setText(tr("unsolved"));
     });

     m_machine->connectToEvent("updateGUI", [this] (const QScxmlEvent &event) {
         const QVariant data = event.data();

         const QVariantList currentRows = data.toMap().value(
                     "currentState").toList();
         for (int i = 0; i < currentRows.count(); i++) {
             const QVariantList row = currentRows.at(i).toList();
             for (int j = 0; j < row.count(); j++) {
                 const int value = row.at(j).toInt();
                 const QString text = value ? QString::number(value) : QString();
                 m_buttons[i][j]->setText(text);
             }
         }

         const bool active = m_machine->isActive("playing");

         const QVariantList initRows = data.toMap().value("initState").toList();
         for (int i = 0; i < initRows.count(); i++) {
             const QVariantList row = initRows.at(i).toList();
             for (int j = 0; j < row.count(); j++) {
                 const int value = row.at(j).toInt();
                 // enable only zeroes from initState
                 const bool enabled = !value && active;
                 m_buttons[i][j]->setEnabled(enabled);
             }
         }
     });

     setLayout(layout);
 }

 MainWindow::~MainWindow()
 {
 }