void StandardCalculatorViewModel::OnButtonPressed()

in src/CalcViewModel/StandardCalculatorViewModel.cpp [593:670]
68 lines of code
33 McCabe index (conditional complexity)

void StandardCalculatorViewModel::OnButtonPressed(Object ^ parameter)
{
    m_feedbackForButtonPress = CalculatorButtonPressedEventArgs::GetAuditoryFeedbackFromCommandParameter(parameter);
    NumbersAndOperatorsEnum numOpEnum = CalculatorButtonPressedEventArgs::GetOperationFromCommandParameter(parameter);
    Command cmdenum = ConvertToOperatorsEnum(numOpEnum);

    if (IsInError)
    {
        m_standardCalculatorManager.SendCommand(Command::CommandCLEAR);

        if (!IsRecoverableCommand(static_cast<Command>(numOpEnum)))
        {
            return;
        }
    }

    if (IsEditingEnabled && numOpEnum != NumbersAndOperatorsEnum::IsScientificMode && numOpEnum != NumbersAndOperatorsEnum::IsStandardMode
        && numOpEnum != NumbersAndOperatorsEnum::IsProgrammerMode && numOpEnum != NumbersAndOperatorsEnum::FToE
        && (numOpEnum != NumbersAndOperatorsEnum::Degree) && (numOpEnum != NumbersAndOperatorsEnum::Radians) && (numOpEnum != NumbersAndOperatorsEnum::Grads))
    {
        if (!m_KeyPressed)
        {
            SaveEditedCommand(m_selectedExpressionToken->TokenPosition, cmdenum);
        }
    }
    else
    {
        if (numOpEnum == NumbersAndOperatorsEnum::IsStandardMode || numOpEnum == NumbersAndOperatorsEnum::IsScientificMode
            || numOpEnum == NumbersAndOperatorsEnum::IsProgrammerMode)
        {
            IsEditingEnabled = false;
        }
        if (numOpEnum == NumbersAndOperatorsEnum::Memory)
        {
            OnMemoryButtonPressed();
        }
        else
        {
            if (numOpEnum == NumbersAndOperatorsEnum::Clear || numOpEnum == NumbersAndOperatorsEnum::ClearEntry
                || numOpEnum == NumbersAndOperatorsEnum::IsStandardMode || numOpEnum == NumbersAndOperatorsEnum::IsProgrammerMode)
            {
                // On Clear('C') the F-E button needs to be UnChecked if it in Checked state.
                // Also, the Primary Display Value should not show in exponential format.
                // Hence the check below to ensure parity with Desktop Calculator.
                // Clear the FE mode if the switching to StandardMode, since 'C'/'CE' in StandardMode
                // doesn't honor the FE button.
                if (IsFToEChecked)
                {
                    IsFToEChecked = false;
                }
            }
            if (numOpEnum == NumbersAndOperatorsEnum::Degree || numOpEnum == NumbersAndOperatorsEnum::Radians || numOpEnum == NumbersAndOperatorsEnum::Grads)
            {
                m_CurrentAngleType = numOpEnum;
            }
            if ((cmdenum >= Command::Command0 && cmdenum <= Command::Command9) || (cmdenum == Command::CommandPNT) || (cmdenum == Command::CommandBACK)
                || (cmdenum == Command::CommandEXP))
            {
                IsOperatorCommand = false;
            }
            else
            {
                IsOperatorCommand = true;
            }

            if (m_isLastOperationHistoryLoad
                && ((numOpEnum != NumbersAndOperatorsEnum::Degree) && (numOpEnum != NumbersAndOperatorsEnum::Radians)
                    && (numOpEnum != NumbersAndOperatorsEnum::Grads)))
            {
                IsFToEEnabled = true;
                m_isLastOperationHistoryLoad = false;
            }

            TraceLogger::GetInstance()->UpdateButtonUsage(numOpEnum, GetCalculatorMode());
            m_standardCalculatorManager.SendCommand(cmdenum);
        }
    }
}