public void Calculate(string operation)
{
PlaySoundService.PlaySound(AppSoundsEnum.DigitalButton);
var addNew = !_operands.Any() || (_operands.Count - _operators.Count) == 0;
switch (operation)
{
case "0":
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "8":
case "9":
if (addNew)
{
_operands.Push(operation);
}
else
{
var lastOperand = _operands.Pop();
_operands.Push(lastOperand + operation);
}
break;
case "-":
_operators.Push(CalculatorOperatorsEnum.Minus);
break;
case "+":
_operators.Push(CalculatorOperatorsEnum.Plus);
break;
case "=":
_operators.Push(CalculatorOperatorsEnum.Equal);
break;
case "C":
_operators.Clear();
_operands.Clear();
break;
}
OutputResult = CalculatorService.Calculate(_operands.ToList(), _operators.ToList());
}
protected async Task NavigateToUri(string uri)
{
if (string.IsNullOrWhiteSpace(uri))
{
throw new ArgumentException("Value cannot be null or white space.", nameof(uri));
}
try
{
DeviceService.BeginInvokeOnMainThread(async() =>
{
PlaySoundService.PlaySound(AppSoundsEnum.DigitalButton);
await NavigationService.NavigateAsync(uri, useModalNavigation: false);
});
}
catch (Exception ex)
{
await HandleException(ex);
}
}