Pfthb

I'm trying to achieve quite a specific thing in WPF. I need to create a verifiable control, which will be binded to object of generic class like this

public interface IVerifiable

 bool Verified get; set; 


public class VerifiableProperty<T> : INotifyPropertyChanged, IVerifiable

 private T _value;
 private bool _verified;

 public T Value
 
 get => _value;
 set
 
 if (Equals(value, _value)) return;
 _value = value;
 OnPropertyChanged();
 
 

 public bool Verified
 
 get => _verified;
 set
 
 if (value == _verified) return;
 _verified = value;
 OnPropertyChanged();
 
 

I bind controls this way

<TextBox Text="Binding Path=Number.Value" att:VerifiableControl.Verified="Binding Path=Number.Verified"
 BorderBrush="Binding Path=(att:VerifiableControl.Verified), Mode=OneWay,
 Converter=StaticResource BackColorVerifiedConverter">
 <inter:Interaction.Triggers>
 <inter:EventTrigger EventName="LostFocus">
 <inter:InvokeCommandAction Command="Binding Path=DataContext.VerifyCurrentFieldCommand, ElementName=Root"
 CommandParameter="Binding Path=Number"/>
 </inter:EventTrigger>
 </inter:Interaction.Triggers>
 </TextBox>

Generic value of Verifiable property object binds to text (or SelectedDate in case of DatePicker, etc.), border color binds to flag "Verified" via converter and also I bind interaction trigger for "FocusLost" event to ViewModel command that just set "Verified" flag of corresponding property object to true.

I really don't like the idea I have to copypaste this block many times with little changes. I know, I cannot put intercation trigger in style and I also couldn't find another way to make some kind of short pattern for that.
So, is there a way to create some kind of short pattern for this xaml code where I could customize name of property to bind? Or maybe you could suggest another approach for what I want ot achieve?

Use some attached properties and attach in there to the LostFocus event.

public static class VerifiableBehaviour

 public static bool GetVerified(UIElement obj) => (bool)obj.GetValue(VerifiedProperty);
 public static void SetVerified(DependencyObject obj, bool value) => obj.SetValue(VerifiedProperty, value);

 public static readonly DependencyProperty VerifiedProperty = DependencyProperty.RegisterAttached(
 "Verified", typeof(bool), typeof(VerifiableBehaviour),
 new FrameworkPropertyMetadata(false)
 
 BindsTwoWayByDefault = true,
 DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
 );

 public static bool GetTracking(UIElement obj) => (bool)obj.GetValue(TrackingProperty);
 public static void SetTracking(UIElement obj, bool value) => obj.SetValue(TrackingProperty, value);

 public static readonly DependencyProperty TrackingProperty = DependencyProperty.RegisterAttached(
 "Tracking", typeof(bool), typeof(VerifiableBehaviour),
 new PropertyMetadata(false, Tracking_PropertyChanged));

 private static void Tracking_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
 
 UIElement element = d as UIElement;

 if ((bool)e.NewValue)
 element.LostFocus += Element_LostFocus;
 else
 element.LostFocus -= Element_LostFocus;
 

 private static void Element_LostFocus(object sender, RoutedEventArgs e)
 
 UIElement element = sender as UIElement;
 SetVerified(element, true);
 

and bind it to your controls

<StackPanel>
 <StackPanel.Resources>
 <DataTemplate x:Key="VerifiableText">
 <StackPanel>
 <TextBox b:VerifiableBehaviour.Tracking="True" 
 b:VerifiableBehaviour.Verified="Binding Verified" 
 Text="Binding Value"/>
 <TextBlock>(Verified: <Run Text="Binding Verified"/>)</TextBlock>
 </StackPanel>
 </DataTemplate>
 </StackPanel.Resources>

 <TextBlock Text="MyProperty1"/>
 <ContentControl ContentTemplate="StaticResource VerifiableText" 
 Content="Binding MyProperty1" IsTabStop="False"/>
 <Separator/>
 <TextBlock Text="MyProperty2"/>
 <ContentControl ContentTemplate="StaticResource VerifiableText" 
 Content="Binding MyProperty2" IsTabStop="False"/>
 <Separator/>
 <TextBlock Text="MyProperty3"/>
 <ContentControl ContentTemplate="StaticResource VerifiableText" 
 Content="Binding MyProperty3" IsTabStop="False"/>
 <Separator/>
 <TextBlock Text="MyProperty4"/>
 <ContentControl ContentTemplate="StaticResource VerifiableText" 
 Content="Binding MyProperty4" IsTabStop="False"/>
 <Separator/>
</StackPanel>