private void OnIpTextChange()
{
string ip = IpBox.Textbox.Text;
int amountOfPeriods = ip.Count(x => x == '.');
if (ip.Any(ch => ch != '.' && !char.IsDigit(ch)) || ip.Split('.').Any(x => x.Length > 3) || amountOfPeriods > 3 || ip.Contains("..") || ip.StartsWith('.'))
{
RevertTextBox();
return;
}
void RevertTextBox()
{
IpBox.Textbox.Text = IpTextBefore;
IpBox.Textbox.SelectionStart = CaretPositionBefore;
IpBox.Textbox.SelectionLength = 0;
}
IpTextBefore = ip;
GetCaretPos(out Point p);
// Returns +9 for each number and +4 for a period. We're finding the amount of periods and adding 6 for each of them, so
// that they act like a number, in order to be able to count caret position properly. Yeah, ugly.
CaretPositionBefore = (p.X + amountOfPeriods * 6) / 9;
bool ipCorrect = IpUtils.IsIpCorrect(ip);
AddButton.Cursor = ipCorrect ? AddButtonProps.AllowCursor : AddButtonProps.DisallowCursor;
IpBox.BorderColor = string.IsNullOrEmpty(ip) || ipCorrect ? IpBoxProps.NeutralColor : IpBoxProps.IncorrectColor;
}