start implement

MinecraftClient/Commands/Inventory.cs

@@ -83,6 +83,13 @@ namespace MinecraftClient.Commands
                                     return keyName + " clicking slot " + slot + " in window #" + inventoryId;
                                 }
                                 else return CMDDesc;
+                            case "drop":
+                                if (args.Length >= 3)
+                                {
+                                    int slot = int.Parse(args[2]);
+                                    handler.DoWindowAction(inventoryId, slot, WindowActionType.DropItem);
+                                }
+                                return "Dropped";
                             default:
                                 return CMDDesc;
                         }

MinecraftClient/Inventory/WindowActionType.cs

@@ -9,6 +9,7 @@ namespace MinecraftClient.Inventory
     {
         LeftClick,
         RightClick,
-        MiddleClick
+        MiddleClick,
+        DropItem
     }
 }

MinecraftClient/Protocol/Handlers/Protocol18.cs

@@ -1362,6 +1362,13 @@ namespace MinecraftClient.Protocol.Handlers
                     case WindowActionType.LeftClick: button = 0; break;
                     case WindowActionType.RightClick: button = 1; break;
                     case WindowActionType.MiddleClick: button = 2; mode = 3; break;
+                    case WindowActionType.DropItem: 
+                        button = 0; 
+                        mode = 4;
+                        item = new Item(-1, 0, null);
+                        Container inventory = handler.GetInventory(0);
+                        inventory.Items[slotId].Count--; // server won't update us after dropped
+                        break;
                 }
 
                 List<byte> packet = new List<byte>();

MinecraftClient/Protocol/IMinecraftComHandler.cs

@@ -33,6 +33,7 @@ namespace MinecraftClient.Protocol
         bool SetInventoryEnabled(bool enabled);
         bool GetEntityHandlingEnabled();
         bool SetEntityHandlingEnabled(bool enabled);
+        Container GetInventory(int inventoryID);
 
         /// <summary>
         /// Called when a server was successfully joined