public static void SetLastSelectionChangedParams(TextBox element, SelectionChangedParams value)
{
element.SetValue(LastSelectionChangedParamsProperty, value);
}
private static void OnTextChanged(object sender, TextChangedEventArgs e)
{
var obj = sender as TextBox;
string text = obj.Text;
string parsingText = text;
string correctText = GetCorrectText(obj);
int? minInt = null;
int? maxInt = null;
double?minDbl = null;
double?maxDbl = null;
NumericInputType inputType = GetInputType(obj);
CultureInfo currentCulture = CultureInfo.CurrentUICulture;
string ignoredSymbol = GetIgnoredSymbol(obj);
bool hasIgnoredSymbol = false;
if (!string.IsNullOrWhiteSpace(ignoredSymbol))
{
int indx = text.LastIndexOf(ignoredSymbol);
if (indx != -1)
{
hasIgnoredSymbol = true;
parsingText = text.Substring(0, indx);
}
else
{
indx = correctText.LastIndexOf(ignoredSymbol);
hasIgnoredSymbol = (indx != -1);
}
}
if (string.IsNullOrWhiteSpace(text))
{
switch (inputType)
{
case NumericInputType.Integer:
minInt = ParseInt(GetMinValue(obj), NumberStyles.None, currentCulture);
parsingText = (minInt ?? default(int)).ToString();
break;
case NumericInputType.Double:
minDbl = double.Parse(GetMinValue(obj), NumberStyles.AllowDecimalPoint, currentCulture);
parsingText = (minDbl ?? default(double)).ToString();
break;
default:
hasIgnoredSymbol = false;
parsingText = correctText;
break;
}
text = $"{parsingText}{((hasIgnoredSymbol) ? ignoredSymbol : "")}";
obj.Text = text;
obj.SelectAll();
return;
}
if (text == correctText)
{
return;
}
bool isCorrect = true;
bool valueChanged = false;
switch (inputType)
{
case NumericInputType.Integer:
isCorrect = int.TryParse(parsingText, NumberStyles.None, currentCulture, out int intResult);
minInt = ParseInt(GetMinValue(obj), NumberStyles.None, currentCulture);
maxInt = ParseInt(GetMaxValue(obj), NumberStyles.None, currentCulture);
if (minInt != null && intResult < minInt)
{
intResult = minInt.Value;
valueChanged = true;
}
if (maxInt != null && intResult > maxInt)
{
intResult = maxInt.Value;
valueChanged = true;
}
if (valueChanged)
{
parsingText = intResult.ToString();
}
break;
case NumericInputType.Double:
parsingText = ValidateDecimalPoint(parsingText, currentCulture);
isCorrect = double.TryParse(parsingText, NumberStyles.AllowDecimalPoint, currentCulture, out double dblResult);
minDbl = double.Parse(GetMinValue(obj), NumberStyles.AllowDecimalPoint, currentCulture);
maxDbl = double.Parse(GetMaxValue(obj), NumberStyles.AllowDecimalPoint, currentCulture);
if (minDbl != null && dblResult < minDbl)
{
dblResult = minDbl.Value;
valueChanged = true;
}
if (maxDbl != null && dblResult > maxDbl)
{
dblResult = maxDbl.Value;
valueChanged = true;
}
if (valueChanged)
{
parsingText = dblResult.ToString();
}
break;
default:
break;
}
if (isCorrect)
{
text = $"{parsingText}{((hasIgnoredSymbol) ? ignoredSymbol : "")}";
SetCorrectText(obj, text);
if (valueChanged)
{
obj.SelectionChanged -= OnSelectionChanged;
obj.TextChanged -= OnTextChanged;
obj.Text = text;
obj.SelectionStart = parsingText.Length;
obj.SelectionChanged += OnSelectionChanged;
obj.TextChanged += OnTextChanged;
}
}
else
{
SelectionChangedParams selectionParams = Services.GetLastSelectionChangedParams(obj);
bool oldTextEmpty = string.IsNullOrWhiteSpace(correctText);
obj.SelectionChanged -= OnSelectionChanged;
obj.TextChanged -= OnTextChanged;
obj.Text = (oldTextEmpty) ? "" : correctText;
obj.SelectionStart = selectionParams.Start;
obj.SelectionLength = selectionParams.Length;
obj.TextChanged += OnTextChanged;
obj.SelectionChanged += OnSelectionChanged;
}
Services.SetLastSelectionChangedParams(obj, new SelectionChangedParams(obj.SelectionStart, obj.SelectionLength));
Services.SetIgnoreSelectionChanged(obj, false);
}
