public CalculatorViewModel(CalculatorModel calculator)
{
_calc = calculator;
NumberCommand = new RelayCommand(param => { _calc.Number(Convert.ToInt32(param)); UpdateDisplay(); },
param => _calc.CanDoNumber());
PlusCommand = new RelayCommand(param => { _calc.Plus(); UpdateDisplay(); },
param => _calc.CanDoOperator());
MinusCommand = new RelayCommand(param => { _calc.Minus(); UpdateDisplay(); },
param => _calc.CanDoOperator());
TimesCommand = new RelayCommand(param => { _calc.Times(); UpdateDisplay(); },
param => _calc.CanDoOperator());
OverCommand = new RelayCommand(param => { _calc.Over(); UpdateDisplay(); },
param => _calc.CanDoOperator());
EqualsCommand = new RelayCommand(param => { _calc.Equals(); UpdateDisplay(); },
param => _calc.CanDoEquals());
ClearCommand = new RelayCommand(param => { _calc.Clear(); UpdateDisplay(); },
param => _calc.CanDoClear());
}
public void ShowResult()
{
var resultValue = CalculatorModel.GetResult();
ShowNumber(resultValue);
CalculatorModel.Clear();
NumberBuilder.NewNumber();
NumberBuilder.Append(resultValue.ToString());
}
private void ClearAllButtonClick(object sender, RoutedEventArgs e)
{
NumberBuilder.NewNumber();
CalculatorModel.Clear();
ShowNumber(CalculatorModel.DEFAULT_START_VALUE);
}