public void ButtonClickAction(object parameter)
{
String paramString = parameter.ToString();
if (paramString == "backspace")
{
if (lastParamString == "+" ||
lastParamString == "-" ||
lastParamString == "*" ||
lastParamString == "/" ||
lastParamString == "=")
{
calculatorModel.Reset();
InputTextBox = "0";
}
if (inputTextBox != "")
{
InputTextBox = inputTextBox.Remove(inputTextBox.Length - 1);
}
if (inputTextBox == "")
{
InputTextBox = "0";
}
}
else if (paramString == "0" ||
paramString == "1" ||
paramString == "2" ||
paramString == "3" ||
paramString == "4" ||
paramString == "5" ||
paramString == "6" ||
paramString == "7" ||
paramString == "8" ||
paramString == "9" ||
paramString == ".")
{
if (lastParamString == "=")
{
calculatorModel.Reset();
inputTextBox = "";
}
AddCharToInput(paramString[0]);
}
else if (paramString == "clear")
{
InputTextBox = "0";
calculatorModel.Reset();
}
else if (paramString == "+" ||
paramString == "-" ||
paramString == "*" ||
paramString == "/" ||
paramString == "=")
{
double inputValue = 0;
if (InputTextBox != "")
{
inputValue = Double.Parse(InputTextBox);
}
calculatorModel.InputNumber(inputValue);
calculatorModel.InputOperator(StringToOperator(paramString));
InputTextBox = calculatorModel.GetCurrentResult().ToString();
if (paramString != "=")
{
inputTextBox = "";
}
}
lastParamString = paramString;
}