Merge pull request #3172 from vgromfeld/u/vgromfeld/hyperlinkCommand

Add missing call to `ICommand.CanExecute()` in `HyperlinkExtensions`

Author: vgromfeld

Microsoft.Toolkit.Uwp.UI/Extensions/Hyperlink/HyperlinkExtensions.cs

@@ -9,7 +9,7 @@
 namespace Microsoft.Toolkit.Uwp.UI
 {
     /// <summary>
-    /// Provides attached dependency properties for the <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> content element that allows
+    /// Provides attached dependency properties for the <see cref="Hyperlink"/> content element that allows
     /// it to invoke a <see cref="ICommand"/> when clicked
     /// </summary>
     public static class HyperlinkExtensions
@@ -29,64 +29,51 @@ public static class HyperlinkExtensions
         /// </summary>
         /// <param name="obj">The <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> from which to get the associated <see cref="ICommand"/> instance</param>
         /// <returns>The <see cref="ICommand"/> instance associated with the the <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> or null</returns>
-        public static ICommand GetCommand(Windows.UI.Xaml.Documents.Hyperlink obj)
-        {
-            return (ICommand)obj.GetValue(CommandProperty);
-        }
+        public static ICommand GetCommand(Hyperlink obj) => (ICommand)obj.GetValue(CommandProperty);
 
         /// <summary>
         /// Sets the <see cref="ICommand"/> instance assocaited with the specified <see cref="Windows.UI.Xaml.Documents.Hyperlink"/>
         /// </summary>
         /// <param name="obj">The <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> to associated the <see cref="ICommand"/> instance to</param>
         /// <param name="value">The <see cref="ICommand"/> instance to bind to the <see cref="Windows.UI.Xaml.Documents.Hyperlink"/></param>
-        public static void SetCommand(Windows.UI.Xaml.Documents.Hyperlink obj, ICommand value)
-        {
-            obj.SetValue(CommandProperty, value);
-        }
+        public static void SetCommand(Hyperlink obj, ICommand value) => obj.SetValue(CommandProperty, value);
 
         /// <summary>
         /// Gets the <see cref="CommandProperty"/> instance assocaited with the specified <see cref="Windows.UI.Xaml.Documents.Hyperlink"/>
         /// </summary>
         /// <param name="obj">The <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> from which to get the associated <see cref="CommandProperty"/> value</param>
         /// <returns>The <see cref="CommandProperty"/> value associated with the the <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> or null</returns>
-        public static object GetCommandParameter(Windows.UI.Xaml.Documents.Hyperlink obj)
-        {
-            return obj.GetValue(CommandParameterProperty);
-        }
+        public static object GetCommandParameter(Hyperlink obj) => obj.GetValue(CommandParameterProperty);
 
         /// <summary>
         /// Sets the <see cref="CommandProperty"/> assocaited with the specified <see cref="Windows.UI.Xaml.Documents.Hyperlink"/>
         /// </summary>
         /// <param name="obj">The <see cref="Windows.UI.Xaml.Documents.Hyperlink"/> to associated the <see cref="CommandProperty"/> instance to</param>
         /// <param name="value">The <see cref="object"/> to set the <see cref="CommandProperty"/> to</param>
-        public static void SetCommandParameter(Windows.UI.Xaml.Documents.Hyperlink obj, object value)
-        {
-            obj.SetValue(CommandParameterProperty, value);
-        }
+        public static void SetCommandParameter(Hyperlink obj, object value) => obj.SetValue(CommandParameterProperty, value);
 
         private static void OnCommandPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
         {
-            Windows.UI.Xaml.Documents.Hyperlink hyperlink = sender as Windows.UI.Xaml.Documents.Hyperlink;
-
-            if (hyperlink != null)
+            if (sender is Hyperlink hyperlink)
             {
                 hyperlink.Click -= OnHyperlinkClicked;
 
-                ICommand command = args.NewValue as ICommand;
-
-                if (command != null)
+                if (args.NewValue is ICommand)
                 {
                     hyperlink.Click += OnHyperlinkClicked;
                 }
             }
         }
 
-        private static void OnHyperlinkClicked(Windows.UI.Xaml.Documents.Hyperlink sender, Windows.UI.Xaml.Documents.HyperlinkClickEventArgs args)
+        private static void OnHyperlinkClicked(Hyperlink sender, HyperlinkClickEventArgs args)
         {
-            ICommand command = GetCommand(sender);
-            object parameter = GetCommandParameter(sender);
+            var command = GetCommand(sender);
+            var parameter = GetCommandParameter(sender);
 
-            command?.Execute(parameter);
+            if (command?.CanExecute(parameter) == true)
+            {
+                command.Execute(parameter);
+            }
         }
     }
 }