Fixed drag and drop obsolete API usage.

src/Avalonia.Input/DragDropDevice.cs

@@ -19,7 +19,7 @@ namespace Avalonia.Input
             return null;
         }
         
-        private DragDropEffects RaiseDragEvent(Interactive target, IInputRoot inputRoot, Point point, RoutedEvent<DragEventArgs> routedEvent, DragDropEffects operation, IDataObject data, InputModifiers modifiers)
+        private DragDropEffects RaiseDragEvent(Interactive target, IInputRoot inputRoot, Point point, RoutedEvent<DragEventArgs> routedEvent, DragDropEffects operation, IDataObject data, KeyModifiers modifiers)
         {
             if (target == null)
                 return DragDropEffects.None;
@@ -38,13 +38,13 @@ namespace Avalonia.Input
             return args.DragEffects;
         }
         
-        private DragDropEffects DragEnter(IInputRoot inputRoot, Point point, IDataObject data, DragDropEffects effects, InputModifiers modifiers)
+        private DragDropEffects DragEnter(IInputRoot inputRoot, Point point, IDataObject data, DragDropEffects effects, KeyModifiers modifiers)
         {
             _lastTarget = GetTarget(inputRoot, point);
             return RaiseDragEvent(_lastTarget, inputRoot, point, DragDrop.DragEnterEvent, effects, data, modifiers);
         }
 
-        private DragDropEffects DragOver(IInputRoot inputRoot, Point point, IDataObject data, DragDropEffects effects, InputModifiers modifiers)
+        private DragDropEffects DragOver(IInputRoot inputRoot, Point point, IDataObject data, DragDropEffects effects, KeyModifiers modifiers)
         {
             var target = GetTarget(inputRoot, point);
 
@@ -77,7 +77,7 @@ namespace Avalonia.Input
             }
         }
 
-        private DragDropEffects Drop(IInputRoot inputRoot, Point point, IDataObject data, DragDropEffects effects, InputModifiers modifiers)
+        private DragDropEffects Drop(IInputRoot inputRoot, Point point, IDataObject data, DragDropEffects effects, KeyModifiers modifiers)
         {
             try
             {
@@ -100,16 +100,16 @@ namespace Avalonia.Input
             switch (e.Type)
             {
                 case RawDragEventType.DragEnter:
-                    e.Effects = DragEnter(e.Root, e.Location, e.Data, e.Effects, e.Modifiers);
+                    e.Effects = DragEnter(e.Root, e.Location, e.Data, e.Effects, e.KeyModifiers);
                     break;
                 case RawDragEventType.DragOver:
-                    e.Effects = DragOver(e.Root, e.Location, e.Data, e.Effects, e.Modifiers);
+                    e.Effects = DragOver(e.Root, e.Location, e.Data, e.Effects, e.KeyModifiers);
                     break;
                 case RawDragEventType.DragLeave:
                     DragLeave(e.Root);
                     break;
                 case RawDragEventType.Drop:
-                    e.Effects = Drop(e.Root, e.Location, e.Data, e.Effects, e.Modifiers);
+                    e.Effects = Drop(e.Root, e.Location, e.Data, e.Effects, e.KeyModifiers);
                     break;
             }
         }

src/Avalonia.Input/DragEventArgs.cs

@@ -13,8 +13,11 @@ namespace Avalonia.Input
 
         public IDataObject Data { get; private set; }
 
+        [Obsolete("Use KeyModifiers")]
         public InputModifiers Modifiers { get; private set; }
 
+        public KeyModifiers KeyModifiers { get; private set; }
+
         public Point GetPosition(IVisual relativeTo)
         {
             var point = new Point(0, 0);
@@ -32,13 +35,25 @@ namespace Avalonia.Input
             return point;
         }
 
+        [Obsolete("Use constructor taking KeyModifiers")]
         public DragEventArgs(RoutedEvent<DragEventArgs> routedEvent, IDataObject data, Interactive target, Point targetLocation, InputModifiers modifiers)
             : base(routedEvent)
         {
-            this.Data = data;
-            this._target = target;
-            this._targetLocation = targetLocation;
-            this.Modifiers = modifiers;
+            Data = data;
+            _target = target;
+            _targetLocation = targetLocation;
+            Modifiers = modifiers;
+            KeyModifiers = (KeyModifiers)(((int)modifiers) & 0xF);
+        }
+
+        public DragEventArgs(RoutedEvent<DragEventArgs> routedEvent, IDataObject data, Interactive target, Point targetLocation, KeyModifiers keyModifiers)
+            : base(routedEvent)
+        {
+            Data = data;
+            _target = target;
+            _targetLocation = targetLocation;
+            Modifiers = (InputModifiers)keyModifiers;
+            KeyModifiers = keyModifiers;
         }
 
     }

src/Avalonia.Input/Raw/RawDragEvent.cs

@@ -1,4 +1,6 @@
-namespace Avalonia.Input.Raw
+using System;
+
+namespace Avalonia.Input.Raw
 {
     public class RawDragEvent : RawInputEventArgs
     {
@@ -6,7 +8,9 @@
         public IDataObject Data { get; }
         public DragDropEffects Effects { get; set; }
         public RawDragEventType Type { get; }
+        [Obsolete("Use KeyModifiers")]
         public InputModifiers Modifiers { get; }
+        public KeyModifiers KeyModifiers { get; }
 
         public RawDragEvent(IDragDropDevice inputDevice, RawDragEventType type, 
             IInputRoot root, Point location, IDataObject data, DragDropEffects effects, RawInputModifiers modifiers)
@@ -17,6 +21,7 @@
             Data = data;
             Effects = effects;
             Modifiers = (InputModifiers)modifiers;
+            KeyModifiers = KeyModifiersUtils.ConvertToKey(modifiers);
         }
     }
 }