Added missing class event handler methods (#18837)

* Added missing class event handler methods

* Moved handling of Holding event in Control to the class method

* Exposed Gesture.RightTappedEvent as InputElement.RightTapped and added a class handler
This event was already being raised, but you wouldn't know about it unless you looked into Avalonia's internals

src/Avalonia.Base/Input/InputElement.cs

@@ -199,6 +199,11 @@ namespace Avalonia.Input
         /// </summary>
         public static readonly RoutedEvent<TappedEventArgs> TappedEvent = Gestures.TappedEvent;
 
+        /// <summary>
+        /// Defines the <see cref="RightTapped"/> event.
+        /// </summary>
+        public static readonly RoutedEvent<TappedEventArgs> RightTappedEvent = Gestures.RightTappedEvent;
+
         /// <summary>
         /// Defines the <see cref="Holding"/> event.
         /// </summary>
@@ -238,6 +243,11 @@ namespace Avalonia.Input
             PointerCaptureLostEvent.AddClassHandler<InputElement>((x, e) => x.OnPointerCaptureLost(e));
             PointerWheelChangedEvent.AddClassHandler<InputElement>((x, e) => x.OnPointerWheelChanged(e));
 
+            TappedEvent.AddClassHandler<InputElement>((x, e) => x.OnTapped(e));
+            RightTappedEvent.AddClassHandler<InputElement>((x, e) => x.OnRightTapped(e));
+            DoubleTappedEvent.AddClassHandler<InputElement>((x, e) => x.OnDoubleTapped(e));
+            HoldingEvent.AddClassHandler<InputElement>((x, e) => x.OnHolding(e));
+
             // Gesture only handlers
             PointerMovedEvent.AddClassHandler<InputElement>((x, e) => x.OnGesturePointerMoved(e), handledEventsToo: true);
             PointerPressedEvent.AddClassHandler<InputElement>((x, e) => x.OnGesturePointerPressed(e), handledEventsToo: true);
@@ -399,6 +409,15 @@ namespace Avalonia.Input
             remove { RemoveHandler(TappedEvent, value); }
         }
 
+        /// <summary>
+        /// Occurs when a right tap gesture occurs on the control.
+        /// </summary>
+        public event EventHandler<TappedEventArgs>? RightTapped
+        {
+            add { AddHandler(RightTappedEvent, value); }
+            remove { RemoveHandler(RightTappedEvent, value); }
+        }
+
         /// <summary>
         /// Occurs when a hold gesture occurs on the control.
         /// </summary>
@@ -746,6 +765,46 @@ namespace Avalonia.Input
         {
         }
 
+        /// <summary>
+        /// Invoked when an unhandled <see cref="TappedEvent"/> reaches an element in its 
+        /// route that is derived from this class. Implement this method to add class handling 
+        /// for this event.
+        /// </summary>
+        /// <param name="e">Data about the event.</param>
+        protected virtual void OnTapped(TappedEventArgs e)
+        {
+        }
+
+        /// <summary>
+        /// Invoked when an unhandled <see cref="RightTappedEvent"/> reaches an element in its 
+        /// route that is derived from this class. Implement this method to add class handling 
+        /// for this event.
+        /// </summary>
+        /// <param name="e">Data about the event.</param>
+        protected virtual void OnRightTapped(TappedEventArgs e)
+        {
+        }
+
+        /// <summary>
+        /// Invoked when an unhandled <see cref="DoubleTappedEvent"/> reaches an element in its 
+        /// route that is derived from this class. Implement this method to add class handling 
+        /// for this event.
+        /// </summary>
+        /// <param name="e">Data about the event.</param>
+        protected virtual void OnDoubleTapped(TappedEventArgs e)
+        {
+        }
+
+        /// <summary>
+        /// Invoked when an unhandled <see cref="HoldingEvent"/> reaches an element in its 
+        /// route that is derived from this class. Implement this method to add class handling 
+        /// for this event.
+        /// </summary>
+        /// <param name="e">Data about the event.</param>
+        protected virtual void OnHolding(HoldingRoutedEventArgs e)
+        {
+        }
+
         protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
         {
             base.OnPropertyChanged(change);

src/Avalonia.Controls/Control.cs

@@ -386,12 +386,12 @@ namespace Avalonia.Controls
             InitializeIfNeeded();
 
             ScheduleOnLoadedCore();
-
-            Holding += OnHoldEvent;
         }
 
-        private void OnHoldEvent(object? sender, HoldingRoutedEventArgs e)
+        protected override void OnHolding(HoldingRoutedEventArgs e)
         {
+            base.OnHolding(e);
+
             if (e.Source == this && !e.Handled && e.HoldingState == HoldingState.Started)
             {
                 // Trigger ContentRequest when hold has started
@@ -408,8 +408,6 @@ namespace Avalonia.Controls
             base.OnDetachedFromVisualTreeCore(e);
 
             OnUnloadedCore();
-
-            Holding -= OnHoldEvent;
         }
 
         /// <inheritdoc/>