writeregistermodel.cpp Example File

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  #include "writeregistermodel.h"

  enum { NumColumn = 0, CoilsColumn = 1, HoldingColumn = 2, ColumnCount = 3, RowCount = 10 };

  WriteRegisterModel::WriteRegisterModel(QObject *parent)
      : QAbstractTableModel(parent),
        m_coils(RowCount, false), m_holdingRegisters(RowCount, 0u)
  {
  }

  int WriteRegisterModel::rowCount(const QModelIndex &/*parent*/) const
  {
      return RowCount;
  }

  int WriteRegisterModel::columnCount(const QModelIndex &/*parent*/) const
  {
      return ColumnCount;
  }

  QVariant WriteRegisterModel::data(const QModelIndex &index, int role) const
  {
      if (!index.isValid() || index.row() >= RowCount || index.column() >= ColumnCount)
          return QVariant();

      Q_ASSERT(m_coils.count() == RowCount);
      Q_ASSERT(m_holdingRegisters.count() == RowCount);

      if (index.column() == NumColumn && role == Qt::DisplayRole)
          return QString::number(index.row());

      if (index.column() == CoilsColumn && role == Qt::CheckStateRole) // coils
          return m_coils.at(index.row()) ? Qt::Checked : Qt::Unchecked;

      else if (index.column() == HoldingColumn && role == Qt::DisplayRole) //holding registers
          return QString("0x%1").arg(QString::number(m_holdingRegisters.at(index.row()), 16));

      return QVariant();

  }

  QVariant WriteRegisterModel::headerData(int section, Qt::Orientation orientation, int role) const
  {
      if (role != Qt::DisplayRole)
          return QVariant();

      if (orientation == Qt::Horizontal) {
          switch (section) {
          case NumColumn:
              return QStringLiteral("#");
          case CoilsColumn:
              return QStringLiteral("Coils  ");
          case HoldingColumn:
              return QStringLiteral("Holding Registers");
          default:
              break;
          }
      }
      return QVariant();
  }

  bool WriteRegisterModel::setData(const QModelIndex &index, const QVariant &value, int role)
  {
      if (!index.isValid() ||  index.row() >= RowCount || index.column() >= ColumnCount)
          return false;

      Q_ASSERT(m_coils.count() == RowCount);
      Q_ASSERT(m_holdingRegisters.count() == RowCount);

      if (index.column() == CoilsColumn && role == Qt::CheckStateRole) { // coils
          auto s = static_cast<Qt::CheckState>(value.toUInt());
          s == Qt::Checked ? m_coils.setBit(index.row()) : m_coils.clearBit(index.row());
          emit dataChanged(index, index);
          return true;
      }

      if (index.column() == HoldingColumn && Qt::EditRole) { // holding registers
          bool result = false;
          quint16 newValue = value.toString().toUShort(&result, 16);
          if (result)
              m_holdingRegisters[index.row()] = newValue;

          emit dataChanged(index, index);
          return result;
      }

      return false;
  }

  Qt::ItemFlags WriteRegisterModel::flags(const QModelIndex &index) const
  {
      if (!index.isValid() || index.row() >= RowCount || index.column() >= ColumnCount)
          return QAbstractTableModel::flags(index);

      Qt::ItemFlags flags = QAbstractTableModel::flags(index);
      if ((index.row() < m_address) || (index.row() >= (m_address + m_number)))
          flags &= ~Qt::ItemIsEnabled;

      if (index.column() == CoilsColumn) //coils
          return flags | Qt::ItemIsUserCheckable;
      if (index.column() == HoldingColumn) //holding registers
          return flags | Qt::ItemIsEditable;

      return flags;
  }

  void WriteRegisterModel::setStartAddress(int address)
  {
      m_address = address;
      emit updateViewport();
  }

  void WriteRegisterModel::setNumberOfValues(const QString &number)
  {
      m_number = number.toInt();
      emit updateViewport();
  }