static void DisplayButtons()
{
Console.Clear();
for (int buttonIndex = 0; buttonIndex < buttons.Count; buttonIndex++)
{
RPNCalculatorEngine.Operation operation = rpnCalcEngine.GetOperation(buttonIndex);
Console.SetCursorPosition(40, buttonIndex);
Console.CursorTop = buttonIndex;
string keyName = operation.ShortCut == '\b' ? "BkSpc" : operation.ShortCut == '\r' ? "Enter" : operation.ShortCut.ToString();
Console.Write("<" + keyName + ">\t" + operation.KeyText + "\t(" + operation.Name + ")");
}
}
public static void Main()
{
rpnCalcEngine = new RPNCalculatorEngine();
buttons = new Dictionary <char, int>();
RPNCalculatorEngine.Operation operation;
int i = 0;
bool errorDisplayed = false;
while ((operation = rpnCalcEngine.GetOperation(i)) != null)
{
buttons.Add(operation.ShortCut, i++);
}
DisplayButtons();
do
{
DrawCalculator();
int button;
char keyChar = Console.ReadKey(true).KeyChar;
if (keyChar == '\x1b')
{
break; // exit the loop if Escape key pressed
}
if (buttons.TryGetValue(keyChar, out button))
{
try
{
if (errorDisplayed)
{
Console.SetCursorPosition(0, 0);
WriteErrorLine(" ");
WriteErrorLine(" ");
DisplayButtons();
errorDisplayed = false;
}
rpnCalcEngine.PressKey(button);
}
catch (FormatException)
{
WriteErrorLine("Invalid number format");
errorDisplayed = true;
}
catch (Exception e)
{
WriteErrorLine(e.Message);
errorDisplayed = true;
}
}
} while (true);
}
