Add pointer properties to hold event args, fixup some docs.

src/Avalonia.Base/Input/Gestures.cs

@@ -13,13 +13,6 @@ namespace Avalonia.Input
         private static bool s_isHolding;
         private static CancellationTokenSource? s_holdCancellationToken;
 
-   /*     /// <summary>
-        /// Defines the <see cref="IsHoldWithMouseEnabled"/> property.
-        /// </summary>
-        public static readonly AttachedProperty<bool> IsHoldWithMouseEnabledProperty =
-            AvaloniaProperty.RegisterAttached<Gestures, Interactive, bool>(
-             "IsHoldWithMouseEnabled");*/
-
         public static readonly RoutedEvent<TappedEventArgs> TappedEvent = RoutedEvent.Register<TappedEventArgs>(
             "Tapped",
             RoutingStrategies.Bubble,
@@ -71,6 +64,9 @@ namespace Avalonia.Input
             RoutedEvent.Register<PullGestureEventArgs>(
                 "PullGesture", RoutingStrategies.Bubble, typeof(Gestures));
 
+        /// <summary>
+        /// Occurs when a user performs a press and hold gesture (with a single touch, mouse, or pen/stylus contact).
+        /// </summary>
         public static readonly RoutedEvent<HoldingRoutedEventArgs> HoldingEvent =
             RoutedEvent.Register<HoldingRoutedEventArgs>(
                 "Holding", RoutingStrategies.Bubble, typeof(Gestures));
@@ -132,7 +128,7 @@ namespace Avalonia.Input
                 {
                     if(s_isHolding && ev.Source is Interactive i)
                     {
-                        i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled));
+                        i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled, s_lastPressPoint, s_lastPointer.Type));
                     }
                     s_holdCancellationToken?.Cancel();
                     s_holdCancellationToken?.Dispose();
@@ -157,7 +153,7 @@ namespace Avalonia.Input
                         if (!token.IsCancellationRequested && e.Source is InputElement i && i.IsHoldingEnabled && ( e.Pointer.Type != PointerType.Mouse || i.IsHoldWithMouseEnabled))
                         {
                             s_isHolding = true;
-                            i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Started));
+                            i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Started, s_lastPressPoint, s_lastPointer.Type));
                         }
                     }, TimeSpan.FromMilliseconds(300));
                 }
@@ -196,7 +192,7 @@ namespace Avalonia.Input
                         if(s_isHolding)
                         {
                             s_isHolding = false;
-                            i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Completed));
+                            i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Completed, s_lastPressPoint, s_lastPointer!.Type));
                         }
                         else if (e.InitialPressMouseButton == MouseButton.Right)
                         {
@@ -241,7 +237,7 @@ namespace Avalonia.Input
 
                     if (s_isHolding && ev.Source is Interactive i)
                     {
-                        i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled));
+                        i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled, s_lastPressPoint, s_lastPointer!.Type));
                     }
                 }
 

src/Avalonia.Base/Input/HoldingRoutedEventArgs.cs

@@ -5,18 +5,47 @@ namespace Avalonia.Input
 {
     public class HoldingRoutedEventArgs : RoutedEventArgs
     {
+        /// <summary>
+        /// Gets the state of the <see cref="Gestures.HoldingEvent"/> event.
+        /// </summary>
         public HoldingState HoldingState { get; }
-        
-        public HoldingRoutedEventArgs(HoldingState holdingState) : base(Gestures.HoldingEvent)
+
+        /// <summary>
+        /// Gets the location of the touch, mouse, or pen/stylus contact.
+        /// </summary>
+        public Point Position { get; }
+
+        /// <summary>
+        /// Gets the pointer type of the input source.
+        /// </summary>
+        public PointerType PointerType { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="HoldingRoutedEventArgs"/> class.
+        /// </summary>
+        public HoldingRoutedEventArgs(HoldingState holdingState, Point position, PointerType pointerType) : base(Gestures.HoldingEvent)
         {
             HoldingState = holdingState;
+            Position = position;
+            PointerType = pointerType;
         }
     }
 
     public enum HoldingState
     {
+        /// <summary>
+        /// A single contact has been detected and a time threshold is crossed without the contact being lifted, another contact detected, or another gesture started.
+        /// </summary>
         Started,
+
+        /// <summary>
+        /// The single contact is lifted.
+        /// </summary>
         Completed,
+
+        /// <summary>
+        /// An additional contact is detected or a subsequent gesture (such as a slide) is detected.
+        /// </summary>
         Cancelled,
     }
 }

src/Avalonia.Base/Input/InputElement.cs

@@ -426,8 +426,7 @@ namespace Avalonia.Input
         }
 
         /// <summary>
-        /// Gets or sets a value that determines whether the Holding event can originate
-        /// from that element.
+        /// Enables or disables support for the press and hold gesture through the left button on a mouse.
         /// </summary>
         public bool IsHoldWithMouseEnabled
         {

src/Avalonia.Controls/Control.cs

@@ -375,9 +375,9 @@ namespace Avalonia.Controls
 
         private void OnHoldEvent(object? sender, HoldingRoutedEventArgs e)
         {
-            if(e.HoldingState == HoldingState.Completed)
+            if(e.HoldingState == HoldingState.Started)
             {
-                // Trigger ContentRequest when hold is complete
+                // Trigger ContentRequest when hold has started
                 RaiseEvent(new ContextRequestedEventArgs());
             }
         }