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7128788
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2011-08-20T00:44:25.163
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2011-08-20T00:44:25.163
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Ok, so the core of the problem was trivial (see accepted answer): I needed to call <code>DependencyProperty.RegisterAttached(...)</code> (as opposed to <code>DependencyProperty.Register(...)</code>. Just wanted to share the result. I decided to scrap the use of a simple <code>enum</code> to specify input type and decided to use markup extensions instead. The attached property implementation now looks like this: <pre><code>public static class IsValid { public static readonly DependencyProperty InputProperty = DependencyProperty.RegisterAttached( "Input", typeof(IsValidInputExtension), typeof(IsValid), new UIPropertyMetadata(onInput)); public static IsValidInputExtension GetInput(DependencyObject d) { return (IsValidInputExtension)d.GetValue(InputProperty); } public static void SetInput(DependencyObject d, IsValidInputExtension value) { d.SetValue(InputProperty, value); } private static void onInput(DependencyObject d, DependencyPropertyChangedEventArgs e) { var textBox = (TextBox)d; var value = (IsValidInputExtension)e.NewValue; if (value == null) { textBox.PreviewTextInput -= validateInput; textBox.PreviewKeyDown -= validateKeyDown; return; } textBox.PreviewTextInput += validateInput; textBox.PreviewKeyDown += validateKeyDown; } private static void validateInput(object sender, TextCompositionEventArgs e) { // dispatch validation to specified markup class ... var textBox = (TextBox) sender; var markup = (IsValidInputExtension)textBox.GetValue(InputProperty); markup.ValidateInput(sender, e); } private static void validateKeyDown(object sender, KeyEventArgs e) { // dispatch validation to specified markup class ... var textBox = (TextBox)sender; var markup = (IsValidInputExtension)textBox.GetValue(InputProperty); markup.ValidateKeyDown(sender, e); } } </code></pre> And here's part of the markup extension classes: <pre><code>public abstract class IsValidInputExtension : MarkupExtension { internal abstract void ValidateInput(object sender, TextCompositionEventArgs e); internal abstract void ValidateKeyDown(object sender, KeyEventArgs e); } public class NumericExtension : IsValidInputExtension { public double Minimum { get; set; } public double Maximum { get; set; } public uint Decimals { get; set; } public override object ProvideValue(IServiceProvider serviceProvider) { return this; } internal override void ValidateInput(object sender, TextCompositionEventArgs e) { var textBox = (TextBox) sender; if (isDecimalSeparator(e.Text) && Decimals == 0) { e.Handled = true; return; } // todo: honor Minimum and Maximum ... } private static bool isDecimalSeparator(string s) { return CultureInfo.CurrentUICulture.NumberFormat.CurrencyDecimalSeparator == s; } internal override void ValidateKeyDown(object sender, KeyEventArgs e) { // block [SPACE] when numeric input is expected ... e.Handled = e.Key == Key.Space; } } public class StringExtension : IsValidInputExtension { public double MaximumLength { get; set; } public override object ProvideValue(IServiceProvider serviceProvider) { return this; } internal override void ValidateInput(object sender, TextCompositionEventArgs e) { // (nop) } internal override void ValidateKeyDown(object sender, KeyEventArgs e) { // todo: honor MaximumLength here } } </code></pre> The end result, in XAML, is quite nice and easy to read... <pre><code><TextBox v:IsValid.Input="{v:Numeric Minimum=0, Maximum=99, Decimals=0}" /> </code></pre> It all seems to work as I hoped. Thanks for all input Cheers /Jonas
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1. This table or related slice is empty.
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1. POCan't get DependencyProperty to work
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1. USJonas Rembratt
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