问题
I'm looking for a MaskedTextBox for WinRT, I can't seem to find any... Does anybody know if such a textbox exists?
I found the one from ComponentOne, but that one is paid, and I'm looking for a free sollution.
If someone knows an open source sollution for Silverlight or Windows Desktop that isn't like over 2000 lines of code, I'm willing to look into it and try to convert it to WinRT.
回答1:
i use a behavior instead of a maskedtextbox control. but honestly i dont know if this would work on WinRT
EDIT: here is my latest version
public class TextBoxInputMaskBehavior : Behavior<TextBox>
{
private WeakPropertyChangeNotifier _notifier;
#region DependencyProperties
public static readonly DependencyProperty InputMaskProperty =
DependencyProperty.Register("InputMask", typeof(string), typeof(TextBoxInputMaskBehavior), null);
public string InputMask
{
get { return (string)GetValue(InputMaskProperty); }
set { SetValue(InputMaskProperty, value); }
}
public static readonly DependencyProperty PromptCharProperty =
DependencyProperty.Register("PromptChar", typeof(char), typeof(TextBoxInputMaskBehavior), new PropertyMetadata('_'));
public char PromptChar
{
get { return (char)GetValue(PromptCharProperty); }
set { SetValue(PromptCharProperty, value); }
}
public static readonly DependencyProperty ResetOnSpaceProperty =
DependencyProperty.Register("ResetOnSpace", typeof(bool), typeof(TextBoxInputMaskBehavior), new PropertyMetadata(false));
public bool ResetOnSpace
{
get { return (bool)GetValue(ResetOnSpaceProperty); }
set { SetValue(ResetOnSpaceProperty, value); }
}
#endregion
public MaskedTextProvider Provider { get; private set; }
public TextBoxInputMaskBehavior()
{
//defaults
}
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.Loaded += AssociatedObjectLoaded;
AssociatedObject.PreviewTextInput += AssociatedObjectPreviewTextInput;
AssociatedObject.PreviewKeyDown += AssociatedObjectPreviewKeyDown;
DataObject.AddPastingHandler(AssociatedObject, Pasting);
}
protected override void OnDetaching()
{
base.OnDetaching();
AssociatedObject.Loaded -= AssociatedObjectLoaded;
AssociatedObject.PreviewTextInput -= AssociatedObjectPreviewTextInput;
AssociatedObject.PreviewKeyDown -= AssociatedObjectPreviewKeyDown;
DataObject.RemovePastingHandler(AssociatedObject, Pasting);
}
/*
Mask Character Accepts Required?
0 Digit (0-9) Required
9 Digit (0-9) or space Optional
# Digit (0-9) or space Required
L Letter (a-z, A-Z) Required
? Letter (a-z, A-Z) Optional
& Any character Required
C Any character Optional
A Alphanumeric (0-9, a-z, A-Z) Required
a Alphanumeric (0-9, a-z, A-Z) Optional
Space separator Required
. Decimal separator Required
, Group (thousands) separator Required
: Time separator Required
/ Date separator Required
$ Currency symbol Required
In addition, the following characters have special meaning:
Mask Character Meaning
< All subsequent characters are converted to lower case
> All subsequent characters are converted to upper case
| Terminates a previous < or >
\ Escape: treat the next character in the mask as literal text rather than a mask symbol
*/
void AssociatedObjectLoaded(object sender, System.Windows.RoutedEventArgs e)
{
this.Provider = new MaskedTextProvider(InputMask, CultureInfo.CurrentCulture);
this.Provider.PromptChar = this.PromptChar;
this.Provider.SkipLiterals = true;
this.Provider.ResetOnSpace = this.ResetOnSpace;
this.Provider.Set(AssociatedObject.Text);
AssociatedObject.Text = GetProviderText();
//seems the only way that the text is formatted correct, when source is updated
//AddValueChanged for TextProperty in a weak manner
this._notifier = new WeakPropertyChangeNotifier(this.AssociatedObject, TextBox.TextProperty);
this._notifier.ValueChanged += new EventHandler(this.UpdateText);
}
void AssociatedObjectPreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
{
e.Handled = true;
this.TreatSelectedText();
var position = this.GetNextCharacterPosition(AssociatedObject.CaretIndex);
if (Keyboard.IsKeyToggled(Key.Insert))
{
if(!this.Provider.Replace(e.Text, position))
{
System.Media.SystemSounds.Beep.Play();
return;
}
}
else
{
if(!this.Provider.InsertAt(e.Text, position))
{
System.Media.SystemSounds.Beep.Play();
return;
}
}
var nextposition = this.GetNextCharacterPosition(position + 1);
this.RefreshText(nextposition);
}
void AssociatedObjectPreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Space)//handle the space
{
e.Handled = true;
this.TreatSelectedText();
var position = this.GetNextCharacterPosition(AssociatedObject.CaretIndex);
if (!this.Provider.InsertAt(" ", position))
{
System.Media.SystemSounds.Beep.Play();
return;
}
this.RefreshText(AssociatedObject.CaretIndex + 1);
}
if (e.Key == Key.Back && AssociatedObject.CaretIndex > 0)//handle the back space
{
e.Handled = true;
//wenn etwas markiert war und der nutzer Backspace klickt soll nur das markierte verschwinden
if(this.TreatSelectedText())
{
this.RefreshText(AssociatedObject.CaretIndex);
return;
}
var denDavor = AssociatedObject.CaretIndex - 1;
if(this.Provider.IsEditPosition(denDavor))
{
if (!this.Provider.RemoveAt(denDavor))
{
System.Media.SystemSounds.Beep.Play();
return;
}
}
this.RefreshText(AssociatedObject.CaretIndex - 1);
}
if (e.Key == Key.Delete)//handle the delete key
{
e.Handled = true;
//wenn etwas markiert war und der nutzer Delete klickt soll nur das markierte verschwinden
if (this.TreatSelectedText())
{
this.RefreshText(AssociatedObject.CaretIndex);
return;
}
var position = AssociatedObject.CaretIndex;
if (this.Provider.IsEditPosition(position))
{
if (!this.Provider.RemoveAt(position))
{
System.Media.SystemSounds.Beep.Play();
return;
}
}
else
{
System.Media.SystemSounds.Beep.Play();
return;
}
this.RefreshText(AssociatedObject.CaretIndex);
}
}
/// <summary>
/// Pasting prüft ob korrekte Daten reingepastet werden
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Pasting(object sender, DataObjectPastingEventArgs e)
{
if (e.DataObject.GetDataPresent(typeof(string)))
{
var pastedText = (string)e.DataObject.GetData(typeof(string));
this.TreatSelectedText();
var position = GetNextCharacterPosition(AssociatedObject.CaretIndex);
if (!this.Provider.InsertAt(pastedText, position))
{
System.Media.SystemSounds.Beep.Play();
}
else
{
this.RefreshText(position);
}
}
e.CancelCommand();
}
private void UpdateText(object sender, EventArgs eventArgs)
{
//check Provider.Text + TextBox.Text
if (this.Provider.ToDisplayString().Equals(AssociatedObject.Text))
return;
//use provider to format
var success = this.Provider.Set(AssociatedObject.Text);
//ui and mvvm/codebehind should be in sync
this.SetText(success ? GetProviderText() : AssociatedObject.Text);
}
/// <summary>
/// Falls eine Textauswahl vorliegt wird diese entsprechend behandelt.
/// </summary>
/// <returns>true Textauswahl behandelt wurde, ansonsten falls </returns>
private bool TreatSelectedText()
{
if (AssociatedObject.SelectionLength > 0)
{
this.Provider.RemoveAt(AssociatedObject.SelectionStart, AssociatedObject.SelectionStart + AssociatedObject.SelectionLength - 1);
return true;
}
return false;
}
private void RefreshText(int position)
{
SetText(GetProviderText());
AssociatedObject.CaretIndex = position;
}
private void SetText(string text)
{
AssociatedObject.Text = String.IsNullOrWhiteSpace(text) ? String.Empty : text;
}
private int GetNextCharacterPosition(int caretIndex)
{
var start = caretIndex;
var position = this.Provider.FindEditPositionFrom(start, true);
if (position == -1)
return start;
else
return position;
}
private string GetProviderText()
{
//wenn noch gar kein Zeichen eingeben wurde, soll auch nix drin stehen
//könnte man noch anpassen wenn man masken in der Oberfläche vllt doch haben will bei nem leeren feld
return this.Provider.AssignedEditPositionCount > 0
? this.Provider.ToDisplayString()
: this.Provider.ToString(false, false);
}
}
来源：https://stackoverflow.com/questions/15545039/maskedtextbox-for-winrt