writeregistermodel.cpp Example File | Qt Serial Bus 5.6

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Qt 5.6.2 Reference Documentation

# writeregistermodel.cpp Example File

modbus/master/writeregistermodel.cpp

      /****************************************************************************
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      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the QtSerialBus module.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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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();
      }