add HoldWaitDuration to IPlatformSettings

src/Avalonia.Base/Input/Gestures.cs

@@ -148,14 +148,18 @@ namespace Avalonia.Input
                     s_holdCancellationToken = new CancellationTokenSource();
                     var token = s_holdCancellationToken.Token;
                     var settings = AvaloniaLocator.Current.GetService<IPlatformSettings>();
-                    DispatcherTimer.RunOnce(() =>
+
+                    if (settings != null)
                     {
-                        if (!token.IsCancellationRequested && e.Source is InputElement i && i.IsHoldingEnabled && ( e.Pointer.Type != PointerType.Mouse || i.IsHoldWithMouseEnabled))
+                        DispatcherTimer.RunOnce(() =>
                         {
-                            s_isHolding = true;
-                            i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Started, s_lastPressPoint, s_lastPointer.Type));
-                        }
-                    }, TimeSpan.FromMilliseconds(300));
+                            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, s_lastPressPoint, s_lastPointer.Type));
+                            }
+                        }, settings.HoldWaitDuration);
+                    }
                 }
                 else if (e.ClickCount % 2 == 0 && e.GetCurrentPoint(visual).Properties.IsLeftButtonPressed)
                 {

src/Avalonia.Base/Platform/DefaultPlatformSettings.cs

@@ -26,5 +26,7 @@ namespace Avalonia.Platform
             };
         }
         public TimeSpan GetDoubleTapTime(PointerType type) => TimeSpan.FromMilliseconds(500);
+
+        public TimeSpan HoldWaitDuration { get; set; } = TimeSpan.FromMilliseconds(300);
     }
 }

src/Avalonia.Base/Platform/IPlatformSettings.cs

@@ -27,5 +27,7 @@ namespace Avalonia.Platform
         /// tap gesture.
         /// </summary>
         TimeSpan GetDoubleTapTime(PointerType type);
+
+        TimeSpan HoldWaitDuration { get; set; }
     }
 }

src/Windows/Avalonia.Win32/Win32Platform.cs

@@ -258,6 +258,8 @@ namespace Avalonia.Win32
 
         public bool CurrentThreadIsLoopThread => _uiThread == Thread.CurrentThread;
 
+        public TimeSpan HoldWaitDuration { get; set; } = TimeSpan.FromMilliseconds(300);
+
         public event Action<DispatcherPriority?> Signaled;
 
         public event EventHandler<ShutdownRequestedEventArgs> ShutdownRequested;