internal void ApplyInput(ICalculatorInput calculatorinput)
{
if (!ValidateInput(calculatorinput))
{
return;
}
var input = InputHistory.LastOrDefault();
if (input is CalculatorOperator && calculatorinput is CalculatorOperator)
{
InputHistory.RemoveAt(InputHistory.Count - 1);
InputHistory.Add(calculatorinput);
FireChange("Input");
return;
}
if ((input == null || input is CalculatorOperator) && calculatorinput.Value == ".")
{
InputHistory.Add(InputButtons.FirstOrDefault(b => b.Value == "0"));
InputHistory.Add(calculatorinput);
}
else
{
InputHistory.Add(calculatorinput);
}
CurrentInput = Input.Replace(" ", "").Split(OperatorButtons.Select(b => b.Value).ToArray(), StringSplitOptions.RemoveEmptyEntries).Where(s => !string.IsNullOrEmpty(s)).LastOrDefault();
FireChange("Input");
if (calculatorinput is CalculatorOperator)
{
CurrentOperator = calculatorinput as CalculatorOperator;
Calculate();
}
}
private void Calculate()
{
var calculation = Input.Replace(" ", "");
var items = calculation.Split(OperatorButtons.Select(o => o.Value).ToArray(), StringSplitOptions.RemoveEmptyEntries);
if (items.Count() < 2)
{
return;
}
List <CalculatorOperator> operators = new List <CalculatorOperator>();
foreach (string s in calculation.Where(o => OperatorButtons.Select(b => b.Value).Contains(o.ToString())).Select(o => o.ToString()))
{
operators.Add(OperatorButtons.FirstOrDefault(o => o.Value == s) as CalculatorOperator);
}
int opindex = 0;
string calcresult = null;
foreach (var item in items)
{
if (calcresult == null)
{
calcresult = item;
continue;
}
var op = operators[opindex];
switch (op.OperatorType)
{
case OperatorTypes.Add:
{
calcresult = (double.Parse(calcresult) + double.Parse(item)).ToString();
} break;
case OperatorTypes.Subtract:
{
calcresult = (double.Parse(calcresult) - double.Parse(item)).ToString();
} break;
case OperatorTypes.Multiply:
{
calcresult = (double.Parse(calcresult) * double.Parse(item)).ToString();
} break;
case OperatorTypes.Divide:
{
calcresult = (double.Parse(calcresult) / double.Parse(item)).ToString();
} break;
}
opindex++;
}
Result = Math.Round(decimal.Parse(calcresult), 2).ToString();
if (CurrentOperator.OperatorType == OperatorTypes.Equals)
{
InputHistory.Clear();
foreach (var c in Result)
{
ApplyInput(InputButtons.FirstOrDefault(i => i.Value.ToString() == c.ToString()));
}
}
FireChange("Input");
}