private void AppendOperator(char opChar)
{
if (CurrentState.CanAppendOperator() || (opChar == '-' && CurrentState.CanAppendUnaryMinus()))
{
Operator op = Operator.Operators[opChar];
Append(op.Symbol);
}
}
private void DisableInvalidButtons()
{
ToggleButtonGroup(CurrentState.CanAppendFunction(), functionNames);
ToggleButtonGroup(CurrentState.CanAppendOperator(), operatorNames);
ToggleButtonGroup(CurrentState.CanAppendNumber(), numberNames);
ToggleButtonGroup(CurrentState.CanAppendDecimal(), "decimal");
ToggleButtonGroup(CurrentState.CanAppendParen(true), "lparen");
ToggleButtonGroup(CurrentState.CanAppendParen(false), "rparen");
ToggleButtonGroup(CurrentState.CanAppendComma(), "comma");
ToggleButtonGroup(CurrentState.CanAppendUnaryMinus() || CurrentState.CanAppendOperator(), "subtract");
ToggleButtonGroup(CurrentState.CanEvaluate(), "evaluate");
}
