Merge pull request #314 from irihitech/numeirc-validation

Fix: fix numeric updown validation error display issue

demo/Ursa.Demo/Pages/FormDemo.axaml

@@ -41,6 +41,7 @@
                         Width="300"
                         u:FormItem.Label="Email"
                         Text="{Binding Email}" />
+                    <u:NumericDoubleUpDown Value="{Binding Number}" u:FormItem.Label="Number" Width="300"/>
                 </u:FormGroup>
                 <u:FormItem Label="Please select a Date">
                     <CalendarDatePicker SelectedDate="{Binding Date}" />

demo/Ursa.Demo/ViewModels/FormDemoViewModel.cs

@@ -24,6 +24,14 @@ public partial class DataModel : ObservableObject
         get=>_name;
         set => SetProperty(ref _name, value);
     }
+
+    private double _number;
+    [Range(0.0, 10.0)]
+    public double Number
+    {
+        get => _number;
+        set => SetProperty(ref _number, value);
+    }
     
     private string _email;
     

src/Ursa/Controls/NumericUpDown/NumericUpDownBase.cs

@@ -380,7 +380,7 @@ public abstract class NumericUpDownBase<T> : NumericUpDown where T : struct, ICo
     }
 
     public static readonly StyledProperty<T?> ValueProperty = AvaloniaProperty.Register<NumericUpDownBase<T>, T?>(
-        nameof(Value), defaultBindingMode: BindingMode.TwoWay);
+        nameof(Value), defaultBindingMode: BindingMode.TwoWay, enableDataValidation: true);
 
     public T? Value
     {
@@ -485,6 +485,15 @@ public abstract class NumericUpDownBase<T> : NumericUpDown where T : struct, ICo
         set => this.SetValue(CommandParameterProperty, value);
     }
 
+    protected override void UpdateDataValidation(AvaloniaProperty property, BindingValueType state, Exception? error)
+    {
+        if (property == ValueProperty)
+        {
+            DataValidationErrors.SetError(this, error);
+        }
+        
+    }
+
     private void InvokeCommand(object? cp)
     {
         if (this.Command != null && this.Command.CanExecute(cp))