WPF Maskable TextBox for Numeric or Text Values

WPF Published November 8, 2012 at 3:19 pm 3 Comments

Download WPF Maskable TextBox Test Application

Introduction

This article describes how to enhance the WPF TextBox and make it accept just maskable numeric decimal, integer or text values. Maskable wpf text box also allows setting minimum and maximum values.
Maskable TextBox allows us to apply mask to a TextBox. This article demonstrates how to use the Maskable TextBox in a WPF application. Also you can download C# and Xaml code.

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namespace xxx.Wpf.HelperClasses { public class TextBoxMaskBehavior

…
Here Sample Screenshot of our test application about using any mask type of wpf textbox.

WPF Maskable Text Box Test Application

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private static void TextBox_PreviewTextInput(object sender,
    System.Windows.Input.TextCompositionEventArgs e)
{
    TextBox _this = (sender as TextBox);
    bool isValid = IsSymbolValid(GetMask(_this), e.Text);
    e.Handled = !isValid;
    if (isValid)
    {
 
        int caret = _this.CaretIndex;
        string text = _this.Text;
        bool textInserted = false;
        int selectionLength = 0;
 
        if (_this.SelectionLength > 0)
        {
            text = text.Substring(0, _this.SelectionStart) +
                    text.Substring(_this.SelectionStart + _this.SelectionLength);
            caret = _this.SelectionStart;
        }
        if (e.Text == NumberFormatInfo.CurrentInfo.NumberDecimalSeparator && 
         text.Contains(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator))
        {
            int ind = text.IndexOf(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator);
            caret = ind;
        }
        if (e.Text == NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
        {
            while (true)
            {
                int ind = text.IndexOf(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator);
                if (ind == -1)
                    break;
 
                text = text.Substring(0, ind) + text.Substring(ind + 1);
                if (caret > ind)
                    caret--;
            }
 
            if (caret == 0)
            {
                text = "0" + text;
                caret++;
            }
            else
            {
                if (caret == 1 && string.Empty + text[0] == NumberFormatInfo.CurrentInfo.NegativeSign)
                {
                    text = NumberFormatInfo.CurrentInfo.NegativeSign + "0" + text.Substring(1);
                    caret++;
                }
            }
 
            if (caret == text.Length)
            {
                selectionLength = 1;
                textInserted = true;
                text = text + NumberFormatInfo.CurrentInfo.NumberDecimalSeparator + "0";
                caret++;
            }
        }
        else if (e.Text == NumberFormatInfo.CurrentInfo.NegativeSign)
        {
            textInserted = true;
            if (_this.Text.Contains(NumberFormatInfo.CurrentInfo.NegativeSign))
            {
                text = text.Replace(NumberFormatInfo.CurrentInfo.NegativeSign, string.Empty);
                if (caret != 0)
                    caret--;
            }
            else
            {
                text = NumberFormatInfo.CurrentInfo.NegativeSign + _this.Text;
                caret++;
            }
        }
 
        if (!textInserted)
        {
            text = text.Substring(0, caret) + e.Text +
                ((caret < _this.Text.Length) ? text.Substring(caret) : string.Empty);
 
            caret++;
        }
 
        try
        {
            double val = Convert.ToDouble(text);
            double newVal = ValidateLimits(GetMinimumValue(_this), GetMaximumValue(_this), val);
            if (val != newVal)
            {
                text = newVal.ToString();
            }
            else if (val == 0)
            {
                if (!text.Contains(NumberFormatInfo.CurrentInfo.NumberDecimalSeparator))
                    text = "0";
            }
        }
        catch
        {
            text = "0";
        }
 
        while (text.Length > 1 && text[0] == '0' && string.Empty + text[1] != NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
        {
            text = text.Substring(1);
            if (caret > 0)
                caret--;
        }
 
        while (text.Length > 2 && string.Empty + text[0] == NumberFormatInfo.CurrentInfo.NegativeSign && text[1] == '0' && string.Empty + text[2] != NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
        {
            text = NumberFormatInfo.CurrentInfo.NegativeSign + text.Substring(2);
            if (caret > 1)
                caret--;
        }
 
        if ((GetMask(_this) == MaskType.Decimal) && text.Length > 3)
        {
            int indexSep = text.IndexOf(NumberFormatInfo.CurrentInfo.CurrencyDecimalSeparator);
            if (indexSep > 0)
            {
                string sepLast = text.Substring(indexSep + 1);
                int length = sepLast.Length;
                if (length > 2)
                    text = text.Substring(0, indexSep) + NumberFormatInfo.CurrentInfo.CurrencyDecimalSeparator + sepLast.Substring(0, 2);
            }
        }
 
        if ((GetMask(_this) == MaskType.Decimal) && text.Length > _this.MaxLength)
        {
            int indexSep = text.IndexOf(NumberFormatInfo.CurrentInfo.CurrencyDecimalSeparator);
            int length = 0;
            if (indexSep > 0)
            {
                string sepLast = text.Substring(indexSep + 1);
                length = sepLast.Length + 1;
 
                if ((text.Length - length) >_this.MaxLength)
                {
                    text = text.Substring(0, _this.MaxLength) + NumberFormatInfo.CurrentInfo.CurrencyDecimalSeparator + sepLast.Substring(0, length - 1);
                }
            }
            if ((text.Length - length) > _this.MaxLength)
            {
                text = text.Substring(0, _this.MaxLength);
            }
        }
 
        if ((GetMask(_this) == MaskType.Integer) && text.Length >_this.MaxLength)
        {
            text = text.Substring(0, _this.MaxLength);
        }
        if ((GetMask(_this) == MaskType.Number) && text.Length > _this.MaxLength)
        {
            text = text.Substring(0, _this.MaxLength);
        }
        if ((GetMask(_this) == MaskType.Any) && text.Length > _this.MaxLength)
        {
            text = text.Substring(0, _this.MaxLength);
        }
 
        if (GetMask(_this) == MaskType.Decimal)
        {
            if (text.Length > 0)
            {
                int firstDotNumber = 0;
                if (text.Contains(NumberFormatInfo.CurrentInfo.CurrencyGroupSeparator))
                {
                    var a = text.Split(NumberFormatInfo.CurrentInfo.CurrencyGroupSeparator.ToCharArray());
                    firstDotNumber = (a.Length - 1);
                }
                text = text.Replace(NumberFormatInfo.CurrentInfo.CurrencyGroupSeparator, "");
                var style = NumberStyles.Number | NumberStyles.AllowDecimalPoint | NumberStyles.AllowThousands;
                var culture = CultureInfo.GetCultureInfo("tr-TR");
                decimal d = Decimal.Parse(text, style, culture.NumberFormat);
                text = string.Format("{0:N}", d);
 
                int lastDotNumber = 0;
                if (text.Contains(NumberFormatInfo.CurrentInfo.CurrencyGroupSeparator))
                {
                    var a = text.Split(NumberFormatInfo.CurrentInfo.CurrencyGroupSeparator.ToCharArray());
                    lastDotNumber = (a.Length - 1);
                }
 
                if (lastDotNumber > firstDotNumber)
                {
                    caret++;
                }
            }
        }
        if (caret > text.Length)
            caret = text.Length;
 
        _this.Text = text;
        _this.CaretIndex = caret;
        _this.SelectionStart = caret;
        _this.SelectionLength = selectionLength;
        e.Handled = true;
    }
}

Also , we are identify Mask Type for our Masked behaviour class.

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public enum MaskType
{
    Any,
    Integer,
    Decimal,
    Number
}

And Finally, Lets Create a MaskedTextBox
Now, we are locate mask for the WPF TextBox like below.

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xmlns:commonWPF="clr-namespace:xxx.Wpf.HelperClasses" 
 
commonWPF:TextBoxMaskBehavior.Mask="Decimal"


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3 Comments to "WPF Maskable TextBox for Numeric or Text Values"

  1. longchamp sacs à main says:
    November 10, 2012 at 5:49 pm

    I will right away grab your rss as I can not find your e-mail subscription link or e-newsletter service. Do you have any? Kindly let me know in order that I could subscribe. Thanks.

    Reply
  2. DSM says:
    November 27, 2012 at 11:55 am

    This is what I am looking for but would be great if the example could be downloaded to VS 10 project. Is it possible?

    Reply
  3. Serhat Tural Serhat Tural says:
    November 29, 2012 at 1:19 pm

    Hi DSM,

    You can download sample application, it is created on Visual Studio 2010.

    Reply

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