public Calculator()
{
_buffer = new CalculatorNumber();
_op = "";
_current = new CalculatorNumber(0);
_operations = new Dictionary <char, Action>
{
{ '+', () => _buffer += _current },
{ '-', () => _buffer -= _current },
{ '*', () => _buffer *= _current },
{ '/', () => _buffer /= _current },
{ '=', () => _buffer.SetValue(_current) },
{ (char)Keys.Enter, () => _buffer.SetValue(_current) }
};
_window = new CalculatorWindow();
_window.InputHandler += (keyCode => HandleInput(keyCode));
_window.UpdateDisplay(_buffer.ToString(), _op, _current.ToString());
}
/// <summary>
/// Обработка входящего сигнала
/// </summary>
/// <param name="key">Сигнал</param>
private void HandleInput(char key)
{
try
{
if (Char.IsDigit(key) || key == '.')
{
_current.Append(key);
}
else if (key == (char)Keys.Back)
{
_current.RemoveDigit();
}
else if (key == (char)0)
{
_current.SetValue(0);
}
else if (_operations.ContainsKey(key))
{
HandleOperation(key);
}
_window.UpdateDisplay(_buffer.ToString(), _op, _current.ToString());
}
catch (NumberOverflowException)
{
_buffer = new CalculatorNumber();
_current.SetValue(0);
_op = "";
_window.UpdateDisplay("OVERFLOW", _op, _current.ToString());
}
catch (NotANumberException)
{
_buffer = new CalculatorNumber();
_current.SetValue(0);
_op = "";
_window.UpdateDisplay("NaN", _op, _current.ToString());
}
}