private Boolean NeedReturn(KeyboardKeys key)
{
var lastInput = _inputList.LastOrDefault();
if (this.KeyboardType == KeyboardTypes.Number)
{
return(key == KeyboardKeys.O_Substract && lastInput != null);
}
if ((lastInput == null || lastInput.IsFunction || lastInput.IsLeftBracket) &&
((KeyboardHelper.IsOperatorKey(key) && key != KeyboardKeys.O_Substract) || KeyboardHelper.IsConfirmKey(key) || KeyboardHelper.IsRightBracketKey(key) || KeyboardHelper.IsUnitConverterKey(key)))
{
return(true);
}
if (lastInput != null)
{
// last minus? × : Overwrite
if (KeyboardHelper.IsOperatorKey(key) && IsLastInputAMinusSign(lastInput)) // return if last input is a minus sign
{
return(true);
}
if (lastInput.IsOperator && (KeyboardHelper.IsConfirmKey(key) || KeyboardHelper.IsRightBracketKey(key) || KeyboardHelper.IsUnitConverterKey(key)))
{
return(true);
}
if (lastInput.IsUnitConverter && (KeyboardHelper.IsRightBracketKey(key) || KeyboardHelper.IsUnitConverterKey(key)))
{
return(true);
}
// already have? × : √
if ((lastInput.IsPoint || GetLastNumericText(this.InputValue).Contains(".")) && KeyboardHelper.IsPointKey(key))
{
return(true);
}
// completed? × : √
if ((lastInput.IsDigit || lastInput.IsPoint || lastInput.IsRightBracket || lastInput.IsPI) && KeyboardHelper.IsRightBracketKey(key))
{
var leftBracketCount = Helpers.GetCount(this.InputValue, @"[([{]");
var rightBracketCount = Helpers.GetCount(this.InputValue, @"[)\]}]");
if (leftBracketCount <= rightBracketCount)
{
return(true);
}
}
}
return(false);
}
private Boolean NeedAddRightBrackets(KeyboardKeys key)
{
var lastInput = _inputList.LastOrDefault();
return(lastInput != null && (lastInput.IsDigit || lastInput.IsPoint || lastInput.IsRightBracket || lastInput.IsPI) && (KeyboardHelper.IsConfirmKey(key) || KeyboardHelper.IsUnitConverterKey(key)));
}
