15 files changed, 473 insertions, 27 deletions

diff --git a/Server/Plugins/APIDump/APIDesc.lua b/Server/Plugins/APIDump/APIDesc.lua
index 1548cf97d..3b37f2fdf 100644
--- a/Server/Plugins/APIDump/APIDesc.lua
+++ b/Server/Plugins/APIDump/APIDesc.lua
@@ -16977,6 +16977,24 @@ end
 					},
 					Notes = "Returns true if the specified item type is any kind of a hoe.",
 				},
+				IsHorseArmor=
+				{
+					IsStatic = true,
+					Params =
+					{
+						{
+							Name = "ItemType",
+							Type = "number",
+						},
+					},
+					Returns =
+					{
+						{
+							Type = "boolean",
+						},
+					},
+					Notes = "Returns true if the specified item type is any kind of a horse armor.",
+				},
 				IsLeggings =
 				{
 					IsStatic = true,
diff --git a/src/ClientHandle.cpp b/src/ClientHandle.cpp
index 020707238..8ed3a6056 100644
--- a/src/ClientHandle.cpp
+++ b/src/ClientHandle.cpp
@@ -678,6 +678,18 @@ void cClientHandle::HandleNPCTrade(int a_SlotNum)
 
 
 
+void cClientHandle::HandleOpenHorseInventory(UInt32 a_EntityID)
+{
+	if (m_Player->GetUniqueID() == a_EntityID)
+	{
+		m_Player->OpenHorseInventory();
+	}
+}
+
+
+
+
+
 void cClientHandle::HandlePing(void)
 {
 	/* TODO: unused function, handles Legacy Server List Ping
diff --git a/src/ClientHandle.h b/src/ClientHandle.h
index 8ded5a5ad..42e2ee10a 100644
--- a/src/ClientHandle.h
+++ b/src/ClientHandle.h
@@ -338,6 +338,10 @@ public:  // tolua_export
 	the NPC UI. */
 	void HandleNPCTrade(int a_SlotNum);
 
+	/** Handles a player opening their inventory while riding a horse.
+	@param a_EntityID ID of the player that is to open the inventory. Should be the same as GetPlayer()->GetUniqueID().  */
+	void HandleOpenHorseInventory(UInt32 a_EntityID);
+
 	void HandlePing             (void);
 	void HandlePlayerAbilities  (bool a_CanFly, bool a_IsFlying, float FlyingSpeed, float WalkingSpeed);
 	void HandlePlayerLook       (float a_Rotation, float a_Pitch, bool a_IsOnGround);
diff --git a/src/Defines.h b/src/Defines.h
index a3222f73a..7a7f4c598 100644
--- a/src/Defines.h
+++ b/src/Defines.h
@@ -1175,6 +1175,25 @@ namespace ItemCategory
 			IsBoots(a_ItemType)
 		);
 	}
+
+
+
+	inline bool IsHorseArmor(short a_ItemType)
+	{
+		switch (a_ItemType)
+		{
+			case E_ITEM_IRON_HORSE_ARMOR:
+			case E_ITEM_GOLD_HORSE_ARMOR:
+			case E_ITEM_DIAMOND_HORSE_ARMOR:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
 }
 
 // tolua_end
diff --git a/src/Entities/Player.cpp b/src/Entities/Player.cpp
index 0769499b1..22f0655f2 100644
--- a/src/Entities/Player.cpp
+++ b/src/Entities/Player.cpp
@@ -5,6 +5,7 @@
 
 #include "Player.h"
 #include "Mobs/Wolf.h"
+#include "Mobs/Horse.h"
 #include "../BoundingBox.h"
 #include "../ChatColor.h"
 #include "../Server.h"
@@ -2202,6 +2203,35 @@ bool cPlayer::LoadFromFile(const AString & a_FileName, cWorldPtr & a_World)
 
 
 
+void cPlayer::OpenHorseInventory()
+{
+	if (
+		(m_AttachedTo == nullptr) ||
+		!m_AttachedTo->IsMob()
+	)
+	{
+		return;
+	}
+
+	auto & Mob = static_cast<cMonster &>(*m_AttachedTo);
+
+	if (Mob.GetMobType() != mtHorse)
+	{
+		return;
+	}
+
+	auto & Horse = static_cast<cHorse &>(Mob);
+	// The client sends requests for untame horses as well but shouldn't actually open
+	if (Horse.IsTame())
+	{
+		Horse.PlayerOpenWindow(*this);
+	}
+}
+
+
+
+
+
 bool cPlayer::SaveToDisk()
 {
 	cFile::CreateFolder(FILE_IO_PREFIX + AString("players/"));  // Create the "players" folder, if it doesn't exist yet (#1268)
diff --git a/src/Entities/Player.h b/src/Entities/Player.h
index 2685622ad..f56841613 100644
--- a/src/Entities/Player.h
+++ b/src/Entities/Player.h
@@ -409,6 +409,10 @@ public:
 
 	const AString & GetLoadedWorldName() { return m_LoadedWorldName; }
 
+	/** Opens the inventory of any tame horse the player is riding.
+	If the player is not riding a horse or if the horse is untamed, does nothing. */
+	void OpenHorseInventory();
+
 	void UseEquippedItem(int a_Amount = 1);
 
 	void SendHealth(void);
diff --git a/src/Mobs/Horse.cpp b/src/Mobs/Horse.cpp
index 07d3f7481..77edc0d27 100644
--- a/src/Mobs/Horse.cpp
+++ b/src/Mobs/Horse.cpp
@@ -5,6 +5,7 @@
 #include "../EffectID.h"
 #include "../Entities/Player.h"
 #include "Broadcaster.h"
+#include "UI/HorseWindow.h"
 
 
 
@@ -12,16 +13,15 @@
 
 cHorse::cHorse(int Type, int Color, int Style, int TameTimes) :
 	super("Horse", mtHorse, "entity.horse.hurt", "entity.horse.death", 1.4, 1.6),
+	cEntityWindowOwner(this),
 	m_bHasChest(false),
 	m_bIsEating(false),
 	m_bIsRearing(false),
 	m_bIsMouthOpen(false),
 	m_bIsTame(false),
-	m_bIsSaddled(false),
 	m_Type(Type),
 	m_Color(Color),
 	m_Style(Style),
-	m_Armour(0),
 	m_TimesToTame(TameTimes),
 	m_TameAttemptTimes(0),
 	m_RearTickCount(0),
@@ -33,6 +33,19 @@ cHorse::cHorse(int Type, int Color, int Style, int TameTimes) :
 
 
 
+cHorse::~cHorse()
+{
+	auto Window = GetWindow();
+	if (Window != nullptr)
+	{
+		Window->OwnerDestroyed();
+	}
+}
+
+
+
+
+
 void cHorse::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 {
 	super::Tick(a_Dt, a_Chunk);
@@ -108,22 +121,24 @@ void cHorse::OnRightClicked(cPlayer & a_Player)
 
 	if (m_bIsTame)
 	{
-		if (!m_bIsSaddled)
+		if (a_Player.IsCrouched())
 		{
-			if (a_Player.GetEquippedItem().m_ItemType == E_ITEM_SADDLE)
-			{
-				// Saddle the horse:
-				if (!a_Player.IsGameModeCreative())
-				{
-					a_Player.GetInventory().RemoveOneEquippedItem();
-				}
-				m_bIsSaddled = true;
-				m_World->BroadcastEntityMetadata(*this);
-			}
-			else
-			{
-				a_Player.AttachTo(this);
-			}
+			PlayerOpenWindow(a_Player);
+			return;
+		}
+
+		auto EquipedItemType = a_Player.GetEquippedItem().m_ItemType;
+
+		if (
+			!IsSaddled() &&
+			(
+				(EquipedItemType == E_ITEM_SADDLE) ||
+				ItemCategory::IsHorseArmor(EquipedItemType)
+			)
+		)
+		{
+			// Player is holding a horse inventory item, open the window:
+			PlayerOpenWindow(a_Player);
 		}
 		else
 		{
@@ -167,6 +182,65 @@ void cHorse::OnRightClicked(cPlayer & a_Player)
 
 
 
+void cHorse::SetHorseSaddle(cItem a_Saddle)
+{
+	if (a_Saddle.m_ItemType == E_ITEM_SADDLE)
+	{
+		m_World->BroadcastSoundEffect("entity.horse.saddle", GetPosition(), 1.0f, 0.8f);
+	}
+	else if (!a_Saddle.IsEmpty())
+	{
+		return;  // Invalid item
+	}
+
+	m_Saddle = std::move(a_Saddle);
+	m_World->BroadcastEntityMetadata(*this);
+}
+
+
+
+
+
+void cHorse::SetHorseArmor(cItem a_Armor)
+{
+	if (ItemCategory::IsHorseArmor(a_Armor.m_ItemType))
+	{
+		m_World->BroadcastSoundEffect("entity.horse.armor", GetPosition(), 1.0f, 0.8f);
+	}
+	else if (!a_Armor.IsEmpty())
+	{
+		return;  // Invalid item
+	}
+
+	m_Armor = std::move(a_Armor);
+	m_World->BroadcastEntityMetadata(*this);
+}
+
+
+
+
+
+int cHorse::GetHorseArmour(void) const
+{
+	switch (m_Armor.m_ItemType)
+	{
+		case E_ITEM_EMPTY:               return 0;
+		case E_ITEM_IRON_HORSE_ARMOR:    return 1;
+		case E_ITEM_GOLD_HORSE_ARMOR:    return 2;
+		case E_ITEM_DIAMOND_HORSE_ARMOR: return 3;
+
+		default:
+		{
+			LOGWARN("cHorse::GetHorseArmour: Invalid armour item (%d)", m_Armor.m_ItemType);
+			return 0;
+		}
+	}
+}
+
+
+
+
+
 void cHorse::GetDrops(cItems & a_Drops, cEntity * a_Killer)
 {
 	if (IsBaby())
@@ -180,9 +254,13 @@ void cHorse::GetDrops(cItems & a_Drops, cEntity * a_Killer)
 		LootingLevel = a_Killer->GetEquippedWeapon().m_Enchantments.GetLevel(cEnchantments::enchLooting);
 	}
 	AddRandomDropItem(a_Drops, 0, 2 + LootingLevel, E_ITEM_LEATHER);
-	if (m_bIsSaddled)
+	if (IsSaddled())
 	{
-		a_Drops.push_back(cItem(E_ITEM_SADDLE, 1));
+		a_Drops.push_back(m_Saddle);
+	}
+	if (!m_Armor.IsEmpty())
+	{
+		a_Drops.push_back(m_Armor);
 	}
 }
 
@@ -205,8 +283,24 @@ void cHorse::InStateIdle(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 
 void cHorse::HandleSpeedFromAttachee(float a_Forward, float a_Sideways)
 {
-	if ((m_bIsTame) && (m_bIsSaddled))
+	if ((m_bIsTame) && IsSaddled())
 	{
 		super::HandleSpeedFromAttachee(a_Forward * m_MaxSpeed, a_Sideways * m_MaxSpeed);
 	}
 }
+
+
+
+
+
+void cHorse::PlayerOpenWindow(cPlayer & a_Player)
+{
+	auto Window = GetWindow();
+	if (Window == nullptr)
+	{
+		Window = new cHorseWindow(*this);
+		OpenWindow(Window);
+	}
+
+	a_Player.OpenWindow(*Window);
+}
diff --git a/src/Mobs/Horse.h b/src/Mobs/Horse.h
index 82026a0ee..38625001e 100644
--- a/src/Mobs/Horse.h
+++ b/src/Mobs/Horse.h
@@ -2,18 +2,21 @@
 #pragma once
 
 #include "PassiveMonster.h"
+#include "UI/WindowOwner.h"
 
 
 
 
 
 class cHorse :
-	public cPassiveMonster
+	public cPassiveMonster,
+	public cEntityWindowOwner
 {
 	typedef cPassiveMonster super;
 
 public:
 	cHorse(int Type, int Color, int Style, int TameTimes);
+	virtual ~cHorse() override;
 
 	CLASS_PROTODEF(cHorse)
 
@@ -23,7 +26,7 @@ public:
 	virtual void Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk) override;
 	virtual void OnRightClicked(cPlayer & a_Player) override;
 
-	bool IsSaddled      (void) const  {return m_bIsSaddled; }
+	bool IsSaddled      (void) const  {return !m_Saddle.IsEmpty(); }
 	bool IsChested      (void) const  {return m_bHasChest; }
 	bool IsEating       (void) const  {return m_bIsEating; }
 	bool IsRearing      (void) const  {return m_bIsRearing; }
@@ -32,7 +35,18 @@ public:
 	int  GetHorseType   (void) const  {return m_Type; }
 	int  GetHorseColor  (void) const  {return m_Color; }
 	int  GetHorseStyle  (void) const  {return m_Style; }
-	int  GetHorseArmour (void) const  {return m_Armour;}
+	int  GetHorseArmour (void) const;
+
+	/** Set the horse's saddle to the given item.
+	@param a_SaddleItem should be either a saddle or empty. */
+	void SetHorseSaddle(cItem a_SaddleItem);
+
+	/** Set the horse's armor slot to the given item.
+	@param a_SaddleItem should be either a type of horse armor or empty. */
+	void SetHorseArmor(cItem a_ArmorItem);
+
+	const cItem & GetHorseSaddle()    const { return m_Saddle; }
+	const cItem & GetHorseArmorItem() const { return m_Armor;  }
 
 	virtual void GetBreedingItems(cItems & a_Items) override
 	{
@@ -40,11 +54,15 @@ public:
 		a_Items.Add(E_ITEM_GOLDEN_APPLE);
 	}
 
+	void PlayerOpenWindow(cPlayer & a_Player);
+
 private:
 
-	bool m_bHasChest, m_bIsEating, m_bIsRearing, m_bIsMouthOpen, m_bIsTame, m_bIsSaddled;
-	int m_Type, m_Color, m_Style, m_Armour, m_TimesToTame, m_TameAttemptTimes, m_RearTickCount;
+	bool m_bHasChest, m_bIsEating, m_bIsRearing, m_bIsMouthOpen, m_bIsTame;
+	int m_Type, m_Color, m_Style, m_TimesToTame, m_TameAttemptTimes, m_RearTickCount;
 	float m_MaxSpeed;
+	cItem m_Saddle;
+	cItem m_Armor;
 
 } ;
 
diff --git a/src/Protocol/Protocol_1_8.cpp b/src/Protocol/Protocol_1_8.cpp
index c384f85b9..e7f197d3d 100644
--- a/src/Protocol/Protocol_1_8.cpp
+++ b/src/Protocol/Protocol_1_8.cpp
@@ -39,6 +39,7 @@ Implements the 1.8 protocol classes:
 
 #include "../Mobs/IncludeAllMonsters.h"
 #include "../UI/Window.h"
+#include "../UI/HorseWindow.h"
 
 #include "../BlockEntities/BeaconEntity.h"
 #include "../BlockEntities/CommandBlockEntity.h"
@@ -1678,7 +1679,8 @@ void cProtocol_1_8_0::SendWindowOpen(const cWindow & a_Window)
 
 	if (a_Window.GetWindowType() == cWindow::wtAnimalChest)
 	{
-		Pkt.WriteBEInt32(0);  // TODO: The animal's EntityID
+		UInt32 HorseID = static_cast<const cHorseWindow &>(a_Window).GetHorseID();
+		Pkt.WriteBEInt32(static_cast<Int32>(HorseID));
 	}
 }
 
@@ -2428,6 +2430,7 @@ void cProtocol_1_8_0::HandlePacketEntityAction(cByteBuffer & a_ByteBuffer)
 		case 2: m_Client->HandleEntityLeaveBed(PlayerID);         break;  // Leave Bed
 		case 3: m_Client->HandleEntitySprinting(PlayerID, true);  break;  // Start sprinting
 		case 4: m_Client->HandleEntitySprinting(PlayerID, false); break;  // Stop sprinting
+		case 6: m_Client->HandleOpenHorseInventory(PlayerID);     break;  // Open horse inventory
 	}
 }
 
diff --git a/src/Protocol/Protocol_1_9.cpp b/src/Protocol/Protocol_1_9.cpp
index fcfc6674a..9dcf8e3aa 100644
--- a/src/Protocol/Protocol_1_9.cpp
+++ b/src/Protocol/Protocol_1_9.cpp
@@ -48,6 +48,7 @@ Implements the 1.9 protocol classes:
 
 #include "../Mobs/IncludeAllMonsters.h"
 #include "../UI/Window.h"
+#include "../UI/HorseWindow.h"
 
 #include "../BlockEntities/BeaconEntity.h"
 #include "../BlockEntities/CommandBlockEntity.h"
@@ -1723,7 +1724,8 @@ void cProtocol_1_9_0::SendWindowOpen(const cWindow & a_Window)
 
 	if (a_Window.GetWindowType() == cWindow::wtAnimalChest)
 	{
-		Pkt.WriteBEInt32(0);  // TODO: The animal's EntityID
+		UInt32 HorseID = static_cast<const cHorseWindow &>(a_Window).GetHorseID();
+		Pkt.WriteBEInt32(static_cast<Int32>(HorseID));
 	}
 }
 
@@ -2517,6 +2519,7 @@ void cProtocol_1_9_0::HandlePacketEntityAction(cByteBuffer & a_ByteBuffer)
 		case 2: m_Client->HandleEntityLeaveBed(PlayerID);         break;  // Leave Bed
 		case 3: m_Client->HandleEntitySprinting(PlayerID, true);  break;  // Start sprinting
 		case 4: m_Client->HandleEntitySprinting(PlayerID, false); break;  // Stop sprinting
+		case 7: m_Client->HandleOpenHorseInventory(PlayerID);     break;  // Open horse inventory
 	}
 }
 
diff --git a/src/UI/CMakeLists.txt b/src/UI/CMakeLists.txt
index 54236a929..6477882b3 100644
--- a/src/UI/CMakeLists.txt
+++ b/src/UI/CMakeLists.txt
@@ -15,6 +15,7 @@ SET (SRCS
 	EnderChestWindow.cpp
 	FurnaceWindow.cpp
 	HopperWindow.cpp
+	HorseWindow.cpp
 	InventoryWindow.cpp)
 
 SET (HDRS
@@ -30,6 +31,7 @@ SET (HDRS
 	EnderChestWindow.h
 	FurnaceWindow.h
 	HopperWindow.h
+	HorseWindow.h
 	InventoryWindow.h
 	MinecartWithChestWindow.h
 	WindowOwner.h)
diff --git a/src/UI/HorseWindow.cpp b/src/UI/HorseWindow.cpp
new file mode 100644
index 000000000..ab060609d
--- /dev/null
+++ b/src/UI/HorseWindow.cpp
@@ -0,0 +1,61 @@
+
+// HorseWindow.cpp
+
+// Representing the UI window for a horse entity
+
+#include "Globals.h"
+#include "Mobs/Horse.h"
+#include "UI/HorseWindow.h"
+#include "UI/SlotArea.h"
+
+
+
+
+
+cHorseWindow::cHorseWindow(cHorse & a_Horse):
+	Super(wtAnimalChest, "Horse"),
+	m_Horse(a_Horse)
+{
+	m_SlotAreas.push_back(new cSlotAreaHorse(a_Horse, *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+}
+
+
+
+
+
+void cHorseWindow::DistributeStack(cItem & a_ItemStack, int a_Slot, cPlayer & a_Player, cSlotArea * a_ClickedArea, bool a_ShouldApply)
+{
+	cSlotAreas AreasInOrder;
+
+	if (a_ClickedArea == m_SlotAreas[0])
+	{
+		// Horse Area
+		AreasInOrder.push_back(m_SlotAreas[2]);  /* Hotbar    */
+		AreasInOrder.push_back(m_SlotAreas[1]);  /* Inventory */
+		Super::DistributeStackToAreas(a_ItemStack, a_Player, AreasInOrder, a_ShouldApply, true);
+	}
+	else
+	{
+		// Inventory or Hotbar
+		if (ItemCategory::IsHorseArmor(a_ItemStack.m_ItemType) || (a_ItemStack.m_ItemType == E_ITEM_SADDLE))
+		{
+			AreasInOrder.push_back(m_SlotAreas[0]);  /* Horse */
+			Super::DistributeStackToAreas(a_ItemStack, a_Player, AreasInOrder, a_ShouldApply, false);
+		}
+	}
+}
+
+
+
+
+
+UInt32 cHorseWindow::GetHorseID() const
+{
+	return m_Horse.GetUniqueID();
+}
+
+
+
+
diff --git a/src/UI/HorseWindow.h b/src/UI/HorseWindow.h
new file mode 100644
index 000000000..77bc2d627
--- /dev/null
+++ b/src/UI/HorseWindow.h
@@ -0,0 +1,34 @@
+
+// HorseWindow.h
+
+// Representing the UI window for a horse entity
+
+#pragma once
+
+#include "Window.h"
+
+class cHorse;
+
+
+
+
+
+class cHorseWindow :
+	public cWindow
+{
+	using Super = cWindow;
+public:
+	cHorseWindow(cHorse & a_Horse);
+
+	virtual void DistributeStack(cItem & a_ItemStack, int a_Slot, cPlayer & a_Player, cSlotArea * a_ClickedArea, bool a_ShouldApply) override;
+
+	/** Returns the horse's entity ID. */
+	UInt32 GetHorseID() const;
+
+private:
+	cHorse & m_Horse;
+};
+
+
+
+
diff --git a/src/UI/SlotArea.cpp b/src/UI/SlotArea.cpp
index 865e9cb44..d093bb337 100644
--- a/src/UI/SlotArea.cpp
+++ b/src/UI/SlotArea.cpp
@@ -21,6 +21,7 @@
 #include "../BlockArea.h"
 #include "../EffectID.h"
 #include "../ClientHandle.h"
+#include "Mobs/Horse.h"
 
 
 
@@ -2596,3 +2597,121 @@ cItem * cSlotAreaTemporary::GetPlayerSlots(cPlayer & a_Player)
 
 
 
+////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaHorse:
+
+cSlotAreaHorse::cSlotAreaHorse(cHorse & a_Horse, cWindow & a_ParentWindow) :
+	cSlotArea(2, a_ParentWindow),
+	m_Horse(a_Horse)
+{
+}
+
+
+
+
+
+void cSlotAreaHorse::Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem)
+{
+	cItem & DraggingItem = a_Player.GetDraggingItem();
+
+	switch (a_ClickAction)
+	{
+		case caLeftClick:
+		case caRightClick:
+		case caDblClick:
+		{
+			// Check for invalid item types
+			if (DraggingItem.IsEmpty())
+			{
+				break;
+			}
+
+			switch (a_SlotNum)
+			{
+				case SaddleSlot:
+				{
+					if (DraggingItem.m_ItemType != E_ITEM_SADDLE)
+					{
+						return;
+					}
+				}
+				case ArmorSlot:
+				{
+					if (!ItemCategory::IsHorseArmor(DraggingItem.m_ItemType))
+					{
+						return;
+					}
+				}
+				default: break;
+			}
+		}
+		default: break;
+	}
+
+	cSlotArea::Clicked(a_Player, a_SlotNum, a_ClickAction, a_ClickedItem);
+}
+
+
+
+
+
+const cItem * cSlotAreaHorse::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	static const cItem InvalidItem;
+	switch (a_SlotNum)
+	{
+		case SaddleSlot: return &m_Horse.GetHorseSaddle();
+		case ArmorSlot:  return &m_Horse.GetHorseArmorItem();
+		default:
+		{
+			LOGWARN("cSlotAreaHorse::GetSlot: Invalid slot number %d", a_SlotNum);
+			return &InvalidItem;
+		}
+	}
+}
+
+
+
+
+
+void cSlotAreaHorse::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	switch (a_SlotNum)
+	{
+		case SaddleSlot: m_Horse.SetHorseSaddle(a_Item); break;
+		case ArmorSlot:  m_Horse.SetHorseArmor(a_Item);  break;
+		default:
+		{
+			LOGWARN("cSlotAreaHorse::SetSlot: Invalid slot number %d", a_SlotNum);
+		}
+	}
+}
+
+
+
+
+
+void cSlotAreaHorse::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots, bool a_BackFill)
+{
+	if (ItemCategory::IsHorseArmor(a_ItemStack.m_ItemType) && m_Horse.GetHorseArmorItem().IsEmpty())
+	{
+		if (a_ShouldApply)
+		{
+			m_Horse.SetHorseArmor(a_ItemStack.CopyOne());
+		}
+		--a_ItemStack.m_ItemCount;
+	}
+	else if ((a_ItemStack.m_ItemType == E_ITEM_SADDLE) && !m_Horse.IsSaddled())
+	{
+		if (a_ShouldApply)
+		{
+			m_Horse.SetHorseSaddle(a_ItemStack.CopyOne());
+		}
+		--a_ItemStack.m_ItemCount;
+	}
+}
+
+
+
+
+
diff --git a/src/UI/SlotArea.h b/src/UI/SlotArea.h
index be21cdada..4463cb315 100644
--- a/src/UI/SlotArea.h
+++ b/src/UI/SlotArea.h
@@ -14,6 +14,7 @@
 
 
 
+class cHorse;
 class cWindow;
 class cPlayer;
 class cBeaconEntity;
@@ -520,3 +521,27 @@ protected:
 
 
 
+
+/** Slot area holding horse saddle and armor. */
+class cSlotAreaHorse:
+	public cSlotArea
+{
+public:
+	enum
+	{
+		SaddleSlot,
+		ArmorSlot
+	};
+
+	cSlotAreaHorse(cHorse & a_Horse, cWindow & a_ParentWindow);
+	virtual void Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem) override;
+	virtual const cItem * GetSlot(int a_SlotNum, cPlayer & a_Player) const override;
+	virtual void SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item) override;
+	virtual void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots, bool a_BackFill) override;
+private:
+	cHorse & m_Horse;
+};
+
+
+
+