private void AppendNumber(char numberChar)
{
if (CurrentState.CanAppendNumber())
{
Append(numberChar);
}
}
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");
}