fixed #179

src/Shared/HandyControl_Shared/Controls/Rate/Rate.cs

@@ -1,4 +1,5 @@
-using System.Linq;
+using System;
+using System.Linq;
 using System.Windows;
 using System.Windows.Input;
 using System.Windows.Media;
@@ -31,7 +32,15 @@ namespace HandyControl.Controls
             "DefaultValue", typeof(double), typeof(Rate), new PropertyMetadata(ValueBoxes.Double0Box));
 
         public static readonly DependencyProperty ValueProperty = DependencyProperty.Register(
-            "Value", typeof(double), typeof(Rate), new PropertyMetadata(ValueBoxes.Double0Box));
+            "Value", typeof(double), typeof(Rate), new PropertyMetadata(ValueBoxes.Double0Box, OnValueChanged));
+
+        private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) =>
+            ((Rate) d).OnValueChanged(new FunctionEventArgs<double>(ValueChangedEvent, d)
+            {
+                Info = (double)e.NewValue
+            });
+
+        protected virtual void OnValueChanged(FunctionEventArgs<double> e) => RaiseEvent(e);
 
         public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
             "Text", typeof(string), typeof(Rate), new PropertyMetadata(default(string)));
@@ -46,6 +55,20 @@ namespace HandyControl.Controls
 
         private bool _updateItems;
 
+        #region Public Events
+
+        public static readonly RoutedEvent ValueChangedEvent =
+            EventManager.RegisterRoutedEvent("ValueChanged", RoutingStrategy.Bubble,
+                typeof(EventHandler<FunctionEventArgs<double>>), typeof(Rate));
+
+        public event EventHandler<FunctionEventArgs<double>> ValueChanged
+        {
+            add => AddHandler(ValueChangedEvent, value);
+            remove => RemoveHandler(ValueChangedEvent, value);
+        }
+
+        #endregion Public Events
+
         public Rate()
         {
             AddHandler(RateItem.SelectedChangedEvent, new RoutedEventHandler(RateItemSelectedChanged));