diff --git a/MinecraftClient/Inventory/WindowActionType.cs b/MinecraftClient/Inventory/WindowActionType.cs
index e826a691..97e281fd 100644
--- a/MinecraftClient/Inventory/WindowActionType.cs
+++ b/MinecraftClient/Inventory/WindowActionType.cs
@@ -5,13 +5,84 @@ using System.Text;
 
 namespace MinecraftClient.Inventory
 {
+    /// <summary>
+    /// Represents mouse interactions with an inventory window
+    /// </summary>
     public enum WindowActionType
     {
+        /// <summary>
+        /// Left click with mouse on a slot: grab or drop a whole item stack
+        /// </summary>
         LeftClick,
+
+        /// <summary>
+        /// Right click with mouse on a slot: grab half a stack or drop a single item
+        /// </summary>
         RightClick,
+
+        /// <summary>
+        /// Middle click with mouse on a slot: grab a full stack from creative inventory
+        /// </summary>
         MiddleClick,
+
+        /// <summary>
+        /// Shift+Left click with mouse on a slot: send a whole item stack to the hotbar or other inventory
+        /// </summary>
         ShiftClick,
+
+        /// <summary>
+        /// Drop a single item on ground after grabbing an item stack
+        /// </summary>
         DropItem,
-        DropItemStack
+
+        /// <summary>
+        /// Drop a whole item stack on ground after grabbing it
+        /// </summary>
+        DropItemStack,
+
+        /// <summary>
+        /// Start hovering slots with left button pressed: Distribute evenly the stack on hovered slots
+        /// </summary>
+        StartDragLeft,
+
+        /// <summary>
+        /// Start hovering slots with right button pressed: Drop one item on each hovered slot
+        /// </summary>
+        StartDragRight,
+
+        /// <summary>
+        /// Start hovering slots with middle button pressed: Create one item stack on each hovered slot in creative mode
+        /// </summary>
+        StartDragMiddle,
+
+        /// <summary>
+        /// Hover a slot to distribute evenly an item stack
+        /// </summary>
+        AddDragLeft,
+
+        /// <summary>
+        /// Hover a slot to drop one item from an item stack
+        /// </summary>
+        AddDragRight,
+
+        /// <summary>
+        /// Hover a slot to create one item stack in creative mode
+        /// </summary>
+        AddDragMiddle,
+
+        /// <summary>
+        /// Stop hovering slots with left button pressed
+        /// </summary>
+        EndDragLeft,
+
+        /// <summary>
+        /// Stop hovering slots with right button pressed
+        /// </summary>
+        EndDragRight,
+
+        /// <summary>
+        /// Stop hovering slots with middble button pressed
+        /// </summary>
+        EndDragMiddle,
     }
 }
diff --git a/MinecraftClient/Protocol/Handlers/Protocol18.cs b/MinecraftClient/Protocol/Handlers/Protocol18.cs
index a9f67407..e125a84b 100644
--- a/MinecraftClient/Protocol/Handlers/Protocol18.cs
+++ b/MinecraftClient/Protocol/Handlers/Protocol18.cs
@@ -1609,6 +1609,7 @@ namespace MinecraftClient.Protocol.Handlers
             catch (System.IO.IOException) { return false; }
             catch (ObjectDisposedException) { return false; }
         }
+
         public bool SendWindowAction(int windowId, int slotId, WindowActionType action, Item item)
         {
             try
@@ -1624,22 +1625,24 @@ namespace MinecraftClient.Protocol.Handlers
 
                 byte button = 0;
                 byte mode = 0;
+
                 switch (action)
                 {
-                    case WindowActionType.LeftClick: button = 0; break;
-                    case WindowActionType.RightClick: button = 1; break;
-                    case WindowActionType.MiddleClick: button = 2; mode = 3; break;
-                    case WindowActionType.ShiftClick: button = 0; mode = 1; item = new Item(-1, 0, null); break;
-                    case WindowActionType.DropItem:
-                        button = 0;
-                        mode = 4;
-                        item = new Item(-1, 0, null);
-                        break;
-                    case WindowActionType.DropItemStack:
-                        button = 1;
-                        mode = 4;
-                        item = new Item(-1, 0, null);
-                        break;
+                    case WindowActionType.LeftClick:       button = 0;  break;
+                    case WindowActionType.RightClick:      button = 1;  break;
+                    case WindowActionType.MiddleClick:     button = 2;  mode = 3; break;
+                    case WindowActionType.ShiftClick:      button = 0;  mode = 1; item = new Item(-1, 0, null); break;
+                    case WindowActionType.DropItem:        button = 0;  mode = 4; item = new Item(-1, 0, null); break;
+                    case WindowActionType.DropItemStack:   button = 1;  mode = 4; item = new Item(-1, 0, null); break;
+                    case WindowActionType.StartDragLeft:   button = 0;  mode = 5; item = new Item(-1, 0, null); slotId = -999; break;
+                    case WindowActionType.StartDragRight:  button = 4;  mode = 5; item = new Item(-1, 0, null); slotId = -999; break;
+                    case WindowActionType.StartDragMiddle: button = 8;  mode = 5; item = new Item(-1, 0, null); slotId = -999; break;
+                    case WindowActionType.EndDragLeft:     button = 2;  mode = 5; item = new Item(-1, 0, null); slotId = -999; break;
+                    case WindowActionType.EndDragRight:    button = 6;  mode = 5; item = new Item(-1, 0, null); slotId = -999; break;
+                    case WindowActionType.EndDragMiddle:   button = 10; mode = 5; item = new Item(-1, 0, null); slotId = -999; break;
+                    case WindowActionType.AddDragLeft:     button = 1;  mode = 5; item = new Item(-1, 0, null); break;
+                    case WindowActionType.AddDragRight:    button = 5;  mode = 5; item = new Item(-1, 0, null); break;
+                    case WindowActionType.AddDragMiddle:   button = 9;  mode = 5; item = new Item(-1, 0, null); break;
                 }
 
                 List<byte> packet = new List<byte>();