5 files changed, 2521 insertions, 0 deletions

diff --git a/src/UI/SlotArea.cpp b/src/UI/SlotArea.cpp
new file mode 100644
index 000000000..7fd7cd996
--- /dev/null
+++ b/src/UI/SlotArea.cpp
@@ -0,0 +1,897 @@
+
+// SlotArea.cpp
+
+// Implements the cSlotArea class and its descendants
+
+#include "Globals.h"
+#include "SlotArea.h"
+#include "../Entities/Player.h"
+#include "../BlockEntities/ChestEntity.h"
+#include "../BlockEntities/DropSpenserEntity.h"
+#include "../BlockEntities/FurnaceEntity.h"
+#include "../Items/ItemHandler.h"
+#include "Window.h"
+#include "../CraftingRecipes.h"
+#include "../Root.h"
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotArea:
+
+cSlotArea::cSlotArea(int a_NumSlots, cWindow & a_ParentWindow) :
+	m_NumSlots(a_NumSlots),
+	m_ParentWindow(a_ParentWindow)
+{
+}
+
+
+
+
+
+void cSlotArea::Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem)
+{
+	/*
+	LOGD("Slot area with %d slots clicked at slot number %d, clicked item %s, slot item %s", 
+		GetNumSlots(), a_SlotNum, 
+		ItemToFullString(a_ClickedItem).c_str(),
+		ItemToFullString(*GetSlot(a_SlotNum, a_Player)).c_str()
+	);
+	*/
+	
+	ASSERT((a_SlotNum >= 0) && (a_SlotNum < GetNumSlots()));
+
+	bool bAsync = false;
+	if (GetSlot(a_SlotNum, a_Player) == NULL)
+	{
+		LOGWARNING("GetSlot(%d) returned NULL! Ignoring click", a_SlotNum);
+		return;
+	}
+	
+	switch (a_ClickAction)
+	{
+		case caShiftLeftClick:
+		case caShiftRightClick:
+		{
+			ShiftClicked(a_Player, a_SlotNum, a_ClickedItem);
+			return;
+		}
+		
+		case caDblClick:
+		{
+			DblClicked(a_Player, a_SlotNum);
+			return;
+		}
+	}
+	
+	cItem Slot(*GetSlot(a_SlotNum, a_Player));
+	if (!Slot.IsSameType(a_ClickedItem))
+	{
+		LOGWARNING("*** Window lost sync at item %d in SlotArea with %d items ***", a_SlotNum, m_NumSlots);
+		LOGWARNING("My item:    %s", ItemToFullString(Slot).c_str());
+		LOGWARNING("Their item: %s", ItemToFullString(a_ClickedItem).c_str());
+		bAsync = true;
+	}
+	cItem & DraggingItem = a_Player.GetDraggingItem();
+	switch (a_ClickAction)
+	{
+		case caRightClick:
+		{
+			if (DraggingItem.m_ItemType <= 0) // Empty-handed?
+			{
+				DraggingItem.m_ItemCount = (char)(((float)Slot.m_ItemCount) / 2.f + 0.5f);
+				Slot.m_ItemCount -= DraggingItem.m_ItemCount;
+				DraggingItem.m_ItemType = Slot.m_ItemType;
+				DraggingItem.m_ItemDamage = Slot.m_ItemDamage;
+
+				if (Slot.m_ItemCount <= 0)
+				{
+					Slot.Empty();
+				}
+			}
+			else if ((Slot.m_ItemType <= 0) || DraggingItem.IsEqual(Slot))
+			{
+				// Drop one item in slot
+				cItemHandler * Handler = ItemHandler(Slot.m_ItemType);
+				if ((DraggingItem.m_ItemCount > 0) && (Slot.m_ItemCount < Handler->GetMaxStackSize()))
+				{
+					Slot.m_ItemType = DraggingItem.m_ItemType;
+					Slot.m_ItemCount++;
+					Slot.m_ItemDamage = DraggingItem.m_ItemDamage;
+					DraggingItem.m_ItemCount--;
+				}
+				if (DraggingItem.m_ItemCount <= 0)
+				{
+					DraggingItem.Empty();
+				}
+			}
+			else if (!DraggingItem.IsEqual(Slot))
+			{
+				// Swap contents
+				cItem tmp(DraggingItem);
+				DraggingItem = Slot;
+				Slot = tmp;
+			}
+			break;
+		}
+		
+		case caLeftClick:
+		{
+			// Left-clicked
+			if (!DraggingItem.IsEqual(Slot))
+			{
+				// Switch contents
+				cItem tmp(DraggingItem);
+				DraggingItem = Slot;
+				Slot = tmp;
+			}
+			else
+			{
+				// Same type, add items:
+				cItemHandler * Handler = ItemHandler(DraggingItem.m_ItemType);
+				int FreeSlots = Handler->GetMaxStackSize() - Slot.m_ItemCount;
+				if (FreeSlots < 0)
+				{
+					ASSERT(!"Bad item stack size - where did we get more items in a slot than allowed?");
+					FreeSlots = 0;
+				}
+				int Filling = (FreeSlots > DraggingItem.m_ItemCount) ? DraggingItem.m_ItemCount : FreeSlots;
+				Slot.m_ItemCount += (char)Filling;
+				DraggingItem.m_ItemCount -= (char)Filling;
+				if (DraggingItem.m_ItemCount <= 0)
+				{
+					DraggingItem.Empty();
+				}
+			}
+			break;
+		}
+		default:
+		{
+			LOGWARNING("SlotArea: Unhandled click action: %d (%s)", a_ClickAction, ClickActionToString(a_ClickAction));
+			m_ParentWindow.BroadcastWholeWindow();
+			return;
+		}
+	}  // switch (a_ClickAction
+	
+	SetSlot(a_SlotNum, a_Player, Slot);
+	if (bAsync)
+	{
+		m_ParentWindow.BroadcastWholeWindow();
+	}
+	
+}
+
+
+
+
+
+void cSlotArea::ShiftClicked(cPlayer & a_Player, int a_SlotNum, const cItem & a_ClickedItem)
+{
+	// Make a copy of the slot, distribute it among the other areas, then update the slot to contain the leftover:
+	cItem Slot(*GetSlot(a_SlotNum, a_Player));
+	m_ParentWindow.DistributeStack(Slot, a_Player, this, true);
+	if (Slot.IsEmpty())
+	{
+		// Empty the slot completely, the cilent doesn't like left-over ItemType with zero count
+		Slot.Empty();
+	}
+	SetSlot(a_SlotNum, a_Player, Slot);
+	
+	// Some clients try to guess our actions and not always right (armor slots in 1.2.5), so we fix them:
+	m_ParentWindow.BroadcastWholeWindow();
+}
+
+
+
+
+
+void cSlotArea::DblClicked(cPlayer & a_Player, int a_SlotNum)
+{
+	cItem & Dragging = a_Player.GetDraggingItem();
+	if (Dragging.IsEmpty())
+	{
+		// Move the item in the dblclicked slot into hand:
+		Dragging = *GetSlot(a_SlotNum, a_Player);
+		cItem EmptyItem;
+		SetSlot(a_SlotNum, a_Player, EmptyItem);
+	}
+	if (Dragging.IsEmpty())
+	{
+		LOGD("%s DblClicked with an empty hand over empty slot, ignoring", a_Player.GetName().c_str());
+		return;
+	}
+	
+	// Add as many items from the surrounding area into hand as possible:
+	// First skip full stacks, then if there's still space, process full stacks as well:
+	if (!m_ParentWindow.CollectItemsToHand(Dragging, *this, a_Player, false))
+	{
+		m_ParentWindow.CollectItemsToHand(Dragging, *this, a_Player, true);
+	}
+	
+	m_ParentWindow.BroadcastWholeWindow();  // We need to broadcast, in case the window was a chest opened by multiple players
+}
+
+
+
+
+
+void cSlotArea::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_Apply, bool a_KeepEmptySlots)
+{
+	for (int i = 0; i < m_NumSlots; i++)
+	{
+		const cItem * Slot = GetSlot(i, a_Player);
+		if (!Slot->IsStackableWith(a_ItemStack) && (!Slot->IsEmpty() || a_KeepEmptySlots))
+		{
+			// Different items
+			continue;
+		}
+		int NumFit = ItemHandler(Slot->m_ItemType)->GetMaxStackSize() - Slot->m_ItemCount;
+		if (NumFit <= 0)
+		{
+			// Full stack already
+			continue;
+		}
+		if (NumFit > a_ItemStack.m_ItemCount)
+		{
+			NumFit = a_ItemStack.m_ItemCount;
+		}
+		if (a_Apply)
+		{
+			cItem NewSlot(a_ItemStack);
+			NewSlot.m_ItemCount = Slot->m_ItemCount + NumFit;
+			SetSlot(i, a_Player, NewSlot);
+		}
+		a_ItemStack.m_ItemCount -= NumFit;
+		if (a_ItemStack.IsEmpty())
+		{
+			return;
+		}
+	}  // for i - Slots
+}
+
+
+
+
+
+bool cSlotArea::CollectItemsToHand(cItem & a_Dragging, cPlayer & a_Player, bool a_CollectFullStacks)
+{
+	int NumSlots = GetNumSlots();
+	for (int i = 0; i < NumSlots; i++)
+	{
+		const cItem & SlotItem = *GetSlot(i, a_Player);
+		if (!SlotItem.IsStackableWith(a_Dragging))
+		{
+			continue;
+		}
+		int ToMove = a_Dragging.GetMaxStackSize() - a_Dragging.m_ItemCount;
+		if (ToMove > SlotItem.m_ItemCount)
+		{
+			ToMove = SlotItem.m_ItemCount;
+		}
+		a_Dragging.m_ItemCount += ToMove;
+		cItem NewSlot(SlotItem);
+		NewSlot.m_ItemCount -= ToMove;
+		SetSlot(i, a_Player, NewSlot);
+		if (!NewSlot.IsEmpty())
+		{
+			// There are leftovers in the slot, so a_Dragging must be full
+			return true;
+		}
+	}  // for i - Slots[]
+	// a_Dragging may be full if there were exactly the number of items needed to fill it
+	return a_Dragging.IsFullStack();
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaChest:
+
+cSlotAreaChest::cSlotAreaChest(cChestEntity * a_Chest, cWindow & a_ParentWindow) :
+	cSlotArea(27, a_ParentWindow),
+	m_Chest(a_Chest)
+{
+}
+
+
+
+
+
+const cItem * cSlotAreaChest::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	// a_SlotNum ranges from 0 to 26, use that to index the chest entity's inventory directly:
+	return &(m_Chest->GetSlot(a_SlotNum));
+}
+
+
+
+
+
+void cSlotAreaChest::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	m_Chest->SetSlot(a_SlotNum, a_Item);
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaDoubleChest:
+
+cSlotAreaDoubleChest::cSlotAreaDoubleChest(cChestEntity * a_TopChest, cChestEntity * a_BottomChest, cWindow & a_ParentWindow) :
+	cSlotArea(54, a_ParentWindow),
+	m_TopChest(a_TopChest),
+	m_BottomChest(a_BottomChest)
+{
+}
+
+
+
+
+
+const cItem * cSlotAreaDoubleChest::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	// a_SlotNum ranges from 0 to 53, use that to index the correct chest's inventory:
+	if (a_SlotNum < 27)
+	{
+		return &(m_TopChest->GetSlot(a_SlotNum));
+	}
+	else
+	{
+		return &(m_BottomChest->GetSlot(a_SlotNum - 27));
+	}
+}
+
+
+
+
+
+void cSlotAreaDoubleChest::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	if (a_SlotNum < 27)
+	{
+		m_TopChest->SetSlot(a_SlotNum, a_Item);
+	}
+	else
+	{
+		m_BottomChest->SetSlot(a_SlotNum - 27, a_Item);
+	}
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaCrafting:
+
+cSlotAreaCrafting::cSlotAreaCrafting(int a_GridSize, cWindow & a_ParentWindow) :
+	cSlotAreaTemporary(1 + a_GridSize * a_GridSize, a_ParentWindow),
+	m_GridSize(a_GridSize)
+{
+	ASSERT((a_GridSize == 2) || (a_GridSize == 3));
+}
+
+
+
+
+
+void cSlotAreaCrafting::Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem)
+{
+	// Override for craft result slot
+	if (a_SlotNum == 0)
+	{
+		if ((a_ClickAction == caShiftLeftClick) || (a_ClickAction == caShiftRightClick))
+		{
+			ShiftClickedResult(a_Player);
+		}
+		else
+		{
+			ClickedResult(a_Player);
+		}
+		return;
+	}
+	super::Clicked(a_Player, a_SlotNum, a_ClickAction, a_ClickedItem);
+	UpdateRecipe(a_Player);
+}
+
+
+
+
+
+void cSlotAreaCrafting::DblClicked(cPlayer & a_Player, int a_SlotNum)
+{
+	if (a_SlotNum == 0)
+	{
+		// Dbl-clicking the crafting result slot shouldn't collect items to hand
+		return;
+	}
+	super::DblClicked(a_Player, a_SlotNum);
+}
+
+
+
+
+
+void cSlotAreaCrafting::OnPlayerRemoved(cPlayer & a_Player)
+{
+	// Toss all items on the crafting grid:
+	TossItems(a_Player, 1, m_NumSlots);
+	
+	// Remove the current recipe from the player -> recipe map:
+	for (cRecipeMap::iterator itr = m_Recipes.begin(), end = m_Recipes.end(); itr != end; ++itr)
+	{
+		if (itr->first == a_Player.GetUniqueID())
+		{
+			// Remove the player from the recipe map:
+			m_Recipes.erase(itr);
+			return;
+		}
+	}  // for itr - m_Recipes[]
+	// Player not found - that is acceptable
+}
+
+
+
+
+
+void cSlotAreaCrafting::ClickedResult(cPlayer & a_Player)
+{
+	const cItem * ResultSlot = GetSlot(0, a_Player);
+	cItem & DraggingItem = a_Player.GetDraggingItem();
+
+	// Get the current recipe:
+	cCraftingRecipe & Recipe = GetRecipeForPlayer(a_Player);
+
+	cItem * PlayerSlots = GetPlayerSlots(a_Player) + 1;
+	cCraftingGrid Grid(PlayerSlots, m_GridSize, m_GridSize);
+
+	// If possible, craft:
+	if (DraggingItem.IsEmpty())
+	{
+		DraggingItem = Recipe.GetResult();
+		Recipe.ConsumeIngredients(Grid);
+		Grid.CopyToItems(PlayerSlots);
+	}
+	else if (DraggingItem.IsEqual(Recipe.GetResult()))
+	{
+		cItemHandler * Handler = ItemHandler(Recipe.GetResult().m_ItemType);
+		if (DraggingItem.m_ItemCount + Recipe.GetResult().m_ItemCount <= Handler->GetMaxStackSize())
+		{
+			DraggingItem.m_ItemCount += Recipe.GetResult().m_ItemCount;
+			Recipe.ConsumeIngredients(Grid);
+			Grid.CopyToItems(PlayerSlots);
+		}
+	}
+
+	// Get the new recipe and update the result slot:
+	UpdateRecipe(a_Player);
+	
+	// We're done. Send all changes to the client and bail out:
+	m_ParentWindow.BroadcastWholeWindow();
+}
+
+
+
+
+
+void cSlotAreaCrafting::ShiftClickedResult(cPlayer & a_Player)
+{
+	cItem Result(*GetSlot(0, a_Player));
+	if (Result.IsEmpty())
+	{
+		return;
+	}
+	cItem * PlayerSlots = GetPlayerSlots(a_Player) + 1;
+	do
+	{
+		// Try distributing the result. If it fails, bail out:
+		cItem ResultCopy(Result);
+		m_ParentWindow.DistributeStack(ResultCopy, a_Player, this, false);
+		if (!ResultCopy.IsEmpty())
+		{
+			// Couldn't distribute all of it. Bail out
+			return;
+		}
+		
+		// Distribute the result, this time for real:
+		ResultCopy = Result;
+		m_ParentWindow.DistributeStack(ResultCopy, a_Player, this, true);
+		
+		// Remove the ingredients from the crafting grid and update the recipe:
+		cCraftingRecipe & Recipe = GetRecipeForPlayer(a_Player);
+		cCraftingGrid Grid(PlayerSlots, m_GridSize, m_GridSize);
+		Recipe.ConsumeIngredients(Grid);
+		Grid.CopyToItems(PlayerSlots);
+		UpdateRecipe(a_Player);
+		if (!Recipe.GetResult().IsEqual(Result))
+		{
+			// The recipe has changed, bail out
+			return;
+		}
+	} while (true);
+}
+
+
+
+
+
+void cSlotAreaCrafting::UpdateRecipe(cPlayer & a_Player)
+{
+	cCraftingGrid   Grid(GetPlayerSlots(a_Player) + 1, m_GridSize, m_GridSize);
+	cCraftingRecipe & Recipe = GetRecipeForPlayer(a_Player);
+	cRoot::Get()->GetCraftingRecipes()->GetRecipe(&a_Player, Grid, Recipe);
+	SetSlot(0, a_Player, Recipe.GetResult());
+	m_ParentWindow.SendSlot(a_Player, this, 0);
+}
+
+
+
+
+
+cCraftingRecipe & cSlotAreaCrafting::GetRecipeForPlayer(cPlayer & a_Player)
+{
+	for (cRecipeMap::iterator itr = m_Recipes.begin(), end = m_Recipes.end(); itr != end; ++itr)
+	{
+		if (itr->first == a_Player.GetUniqueID())
+		{
+			return itr->second;
+		}
+	}  // for itr - m_Recipes[]
+	
+	// Not found. Add a new one:
+	cCraftingGrid   Grid(GetPlayerSlots(a_Player) + 1, m_GridSize, m_GridSize);
+	cCraftingRecipe Recipe(Grid);
+	cRoot::Get()->GetCraftingRecipes()->GetRecipe(&a_Player, Grid, Recipe);
+	m_Recipes.push_back(std::make_pair(a_Player.GetUniqueID(), Recipe));
+	return m_Recipes.back().second;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaFurnace:
+
+cSlotAreaFurnace::cSlotAreaFurnace(cFurnaceEntity * a_Furnace, cWindow & a_ParentWindow) :
+	cSlotArea(3, a_ParentWindow),
+	m_Furnace(a_Furnace)
+{
+	m_Furnace->GetContents().AddListener(*this);
+}
+
+
+
+
+
+cSlotAreaFurnace::~cSlotAreaFurnace()
+{
+	m_Furnace->GetContents().RemoveListener(*this);
+}
+
+
+
+
+
+void cSlotAreaFurnace::Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem)
+{
+	super::Clicked(a_Player, a_SlotNum, a_ClickAction, a_ClickedItem);
+	
+	if (m_Furnace == NULL)
+	{
+		LOGERROR("cSlotAreaFurnace::Clicked(): m_Furnace == NULL");
+		ASSERT(!"cSlotAreaFurnace::Clicked(): m_Furnace == NULL");
+		return;
+	}
+}
+
+
+
+
+
+const cItem * cSlotAreaFurnace::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	// a_SlotNum ranges from 0 to 2, query the items from the underlying furnace:
+	return &(m_Furnace->GetSlot(a_SlotNum));
+}
+
+
+
+
+
+void cSlotAreaFurnace::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	m_Furnace->SetSlot(a_SlotNum, a_Item);
+}
+
+
+
+
+
+void cSlotAreaFurnace::OnSlotChanged(cItemGrid * a_ItemGrid, int a_SlotNum)
+{
+	// Something has changed in the window, broadcast the entire window to all clients
+	ASSERT(a_ItemGrid == &(m_Furnace->GetContents()));
+	
+	m_ParentWindow.BroadcastWholeWindow();
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaInventoryBase:
+
+cSlotAreaInventoryBase::cSlotAreaInventoryBase(int a_NumSlots, int a_SlotOffset, cWindow & a_ParentWindow) :
+	cSlotArea(a_NumSlots, a_ParentWindow),
+	m_SlotOffset(a_SlotOffset)
+{
+}
+
+
+
+
+
+void cSlotAreaInventoryBase::Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem)
+{
+	if (a_Player.IsGameModeCreative() && (m_ParentWindow.GetWindowType() == cWindow::wtInventory))
+	{
+		// Creative inventory must treat a_ClickedItem as a DraggedItem instead, replacing the inventory slot with it
+		SetSlot(a_SlotNum, a_Player, a_ClickedItem);
+		return;
+	}
+	
+	// Survival inventory and all other windows' inventory has the same handling as normal slot areas
+	super::Clicked(a_Player, a_SlotNum, a_ClickAction, a_ClickedItem);
+	return;
+}
+
+
+
+
+
+const cItem * cSlotAreaInventoryBase::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	// a_SlotNum ranges from 0 to 35, map that to the player's inventory slots according to the internal offset
+	return &a_Player.GetInventory().GetSlot(a_SlotNum + m_SlotOffset);
+}
+
+
+
+
+
+void cSlotAreaInventoryBase::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	a_Player.GetInventory().SetSlot(a_SlotNum + m_SlotOffset, a_Item);
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaArmor:
+
+void cSlotAreaArmor::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots)
+{
+	if (ItemCategory::IsHelmet(a_ItemStack.m_ItemType) && GetSlot(0, a_Player)->IsEmpty())
+	{
+		if (a_ShouldApply)
+		{
+			SetSlot(0, a_Player, a_ItemStack.CopyOne());
+		}
+		a_ItemStack.m_ItemCount -= 1;
+	}
+	else if (ItemCategory::IsChestPlate(a_ItemStack.m_ItemType) && GetSlot(1, a_Player)->IsEmpty())
+	{
+		if (a_ShouldApply)
+		{
+			SetSlot(1, a_Player, a_ItemStack.CopyOne());
+		}
+		a_ItemStack.m_ItemCount -= 1;
+	}
+	else if (ItemCategory::IsLeggings(a_ItemStack.m_ItemType) && GetSlot(2, a_Player)->IsEmpty())
+	{
+		if (a_ShouldApply)
+		{
+			SetSlot(2, a_Player, a_ItemStack.CopyOne());
+		}
+		a_ItemStack.m_ItemCount -= 1;
+	}
+	else if (ItemCategory::IsBoots(a_ItemStack.m_ItemType) && GetSlot(3, a_Player)->IsEmpty())
+	{
+		if (a_ShouldApply)
+		{
+			SetSlot(3, a_Player, a_ItemStack.CopyOne());
+		}
+		a_ItemStack.m_ItemCount -= 1;
+	}
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaItemGrid:
+
+cSlotAreaItemGrid::cSlotAreaItemGrid(cItemGrid & a_ItemGrid, cWindow & a_ParentWindow) :
+	super(a_ItemGrid.GetNumSlots(), a_ParentWindow),
+	m_ItemGrid(a_ItemGrid)
+{
+	m_ItemGrid.AddListener(*this);
+}
+
+
+
+
+
+cSlotAreaItemGrid::~cSlotAreaItemGrid()
+{
+	m_ItemGrid.RemoveListener(*this);
+}
+
+
+
+
+
+const cItem * cSlotAreaItemGrid::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	return &m_ItemGrid.GetSlot(a_SlotNum);
+}
+
+
+
+
+
+void cSlotAreaItemGrid::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	m_ItemGrid.SetSlot(a_SlotNum, a_Item);
+}
+
+
+
+
+
+void cSlotAreaItemGrid::OnSlotChanged(cItemGrid * a_ItemGrid, int a_SlotNum)
+{
+	ASSERT(a_ItemGrid == &m_ItemGrid);
+	m_ParentWindow.BroadcastSlot(this, a_SlotNum);
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cSlotAreaTemporary:
+
+cSlotAreaTemporary::cSlotAreaTemporary(int a_NumSlots, cWindow & a_ParentWindow) :
+	cSlotArea(a_NumSlots, a_ParentWindow)
+{
+}
+
+
+
+
+
+const cItem * cSlotAreaTemporary::GetSlot(int a_SlotNum, cPlayer & a_Player) const
+{
+	cItemMap::const_iterator itr = m_Items.find(a_Player.GetUniqueID());
+	if (itr == m_Items.end())
+	{
+		LOGERROR("cSlotAreaTemporary: player \"%s\" not found for slot %d!", a_Player.GetName().c_str(), a_SlotNum);
+		ASSERT(!"cSlotAreaTemporary: player not found!");
+		
+		// Player not found, this should not happen, ever! Return NULL, but things may break by this.
+		return NULL;
+	}
+	
+	if (a_SlotNum >= (int)(itr->second.size()))
+	{
+		LOGERROR("cSlotAreaTemporary: asking for more slots than actually stored!");
+		ASSERT(!"cSlotAreaTemporary: asking for more slots than actually stored!");
+		return NULL;
+	}
+	
+	return &(itr->second[a_SlotNum]);
+}
+
+
+
+
+
+void cSlotAreaTemporary::SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item)
+{
+	cItemMap::iterator itr = m_Items.find(a_Player.GetUniqueID());
+	if (itr == m_Items.end())
+	{
+		// Player not found
+		LOGWARNING("cSlotAreaTemporary: player not found!");
+		return;
+	}
+	
+	if (a_SlotNum >= (int)(itr->second.size()))
+	{
+		LOGERROR("cSlotAreaTemporary: asking for more slots than actually stored!");
+		return;
+	}
+	
+	itr->second[a_SlotNum] = a_Item;
+}
+
+
+
+
+
+void cSlotAreaTemporary::OnPlayerAdded(cPlayer & a_Player)
+{
+	ASSERT(m_Items.find(a_Player.GetUniqueID()) == m_Items.end());  // The player shouldn't be in the itemmap, otherwise we probably have a leak
+	m_Items[a_Player.GetUniqueID()].resize(m_NumSlots);  // Make the vector the specified size of empty items
+}
+
+
+
+
+
+void cSlotAreaTemporary::OnPlayerRemoved(cPlayer & a_Player)
+{
+	cItemMap::iterator itr = m_Items.find(a_Player.GetUniqueID());
+	ASSERT(itr != m_Items.end());  // The player should be in the list, otherwise a call to OnPlayerAdded() was mismatched
+	m_Items.erase(itr);
+}
+
+
+
+
+
+void cSlotAreaTemporary::TossItems(cPlayer & a_Player, int a_Begin, int a_End)
+{
+	cItemMap::iterator itr = m_Items.find(a_Player.GetUniqueID());
+	if (itr == m_Items.end())
+	{
+		LOGWARNING("Player tossing items (%s) not found in the item map", a_Player.GetName().c_str());
+		return;
+	}
+	
+	cItems Drops;
+	for (int i = a_Begin; i < a_End; i++)
+	{
+		cItem & Item = itr->second[i];
+		if (!Item.IsEmpty())
+		{
+			Drops.push_back(Item);
+		}
+		Item.Empty();
+	}  // for i - itr->second[]
+	
+	double vX = 0, vY = 0, vZ = 0;
+	EulerToVector(-a_Player.GetRotation(), a_Player.GetPitch(), vZ, vX, vY);
+	vY = -vY * 2 + 1.f;
+	a_Player.GetWorld()->SpawnItemPickups(Drops, a_Player.GetPosX(), a_Player.GetPosY() + 1.6f, a_Player.GetPosZ(), vX * 3, vY * 3, vZ * 3, true); // 'true' because player created
+}
+
+
+
+
+
+cItem * cSlotAreaTemporary::GetPlayerSlots(cPlayer & a_Player)
+{
+	cItemMap::iterator itr = m_Items.find(a_Player.GetUniqueID());
+	if (itr == m_Items.end())
+	{
+		return NULL;
+	}
+	return &(itr->second[0]);
+}
+
+
+
+
diff --git a/src/UI/SlotArea.h b/src/UI/SlotArea.h
new file mode 100644
index 000000000..b1944d901
--- /dev/null
+++ b/src/UI/SlotArea.h
@@ -0,0 +1,313 @@
+
+// SlotArea.h
+
+// Interfaces to the cSlotArea class representing a contiguous area of slots in a UI window
+
+
+
+
+#pragma once
+
+#include "../Inventory.h"
+
+
+
+class cWindow;
+class cPlayer;
+class cChestEntity;
+class cDropSpenserEntity;
+class cFurnaceEntity;
+class cCraftingRecipe;
+
+
+
+
+
+class cSlotArea
+{
+public:
+	cSlotArea(int a_NumSlots, cWindow & a_ParentWindow);
+	virtual ~cSlotArea() {}  // force a virtual destructor in all subclasses
+	
+	int GetNumSlots(void) const { return m_NumSlots; }
+	
+	/// Called to retrieve an item in the specified slot for the specified player. Must return a valid cItem.
+	virtual const cItem * GetSlot(int a_SlotNum, cPlayer & a_Player) const = 0;
+	
+	/// Called to set an item in the specified slot for the specified player
+	virtual void SetSlot(int a_SlotNum, cPlayer & a_Player, const cItem & a_Item) = 0;
+	
+	/// Called when a player clicks in the window. Parameters taken from the click packet.
+	virtual void Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem);
+	
+	/// Called from Clicked when the action is a shiftclick (left or right)
+	virtual void ShiftClicked(cPlayer & a_Player, int a_SlotNum, const cItem & a_ClickedItem);
+	
+	/// Called from Clicked when the action is a caDblClick
+	virtual void DblClicked(cPlayer & a_Player, int a_SlotNum);
+	
+	/// Called when a new player opens the same parent window. The window already tracks the player. CS-locked.
+	virtual void OnPlayerAdded(cPlayer & a_Player) {} ;
+	
+	/// Called when one of the players closes the parent window. The window already doesn't track the player. CS-locked.
+	virtual void OnPlayerRemoved(cPlayer & a_Player) {} ;
+	
+	/** Called to store as much of a_ItemStack in the area as possible. a_ItemStack is modified to reflect the change.
+	The default implementation searches each slot for available space and distributes the stack there.
+	if a_ShouldApply is true, the changes are written into the slots;
+	if a_ShouldApply is false, only a_ItemStack is modified to reflect the number of fits (for fit-testing purposes)
+	If a_KeepEmptySlots is true, empty slots will be skipped and won't be filled
+	*/
+	virtual void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots);
+	
+	/// Called on DblClicking to collect all stackable items into hand.
+	/// The items are accumulated in a_Dragging and removed from the slots immediately.
+	/// If a_CollectFullStacks is false, slots with full stacks are skipped while collecting.
+	/// Returns true if full stack has been collected in a_Dragging, false if there's space remaining to fill.
+	virtual bool CollectItemsToHand(cItem & a_Dragging, cPlayer & a_Player, bool a_CollectFullStacks);
+	
+protected:
+	int       m_NumSlots;
+	cWindow & m_ParentWindow;
+} ;
+
+
+
+
+
+/// Handles any part of the inventory, using parameters in constructor to distinguish between the parts
+class cSlotAreaInventoryBase :
+	public cSlotArea
+{
+	typedef cSlotArea super;
+	
+public:
+	cSlotAreaInventoryBase(int a_NumSlots, int a_SlotOffset, cWindow & a_ParentWindow);
+	
+	// Creative inventory's click handling is somewhat different from survival inventory's, handle that here:
+	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;
+	
+protected:
+	int m_SlotOffset;  // Index that this area's slot 0 has in the underlying cInventory
+} ;
+
+
+
+
+
+/// Handles the main inventory of each player, excluding the armor and hotbar
+class cSlotAreaInventory :
+	public cSlotAreaInventoryBase
+{
+	typedef cSlotAreaInventoryBase super;
+	
+public:
+	cSlotAreaInventory(cWindow & a_ParentWindow) :
+		cSlotAreaInventoryBase(cInventory::invInventoryCount, cInventory::invInventoryOffset, a_ParentWindow)
+	{
+	}
+} ;
+
+
+
+
+
+/// Handles the hotbar of each player
+class cSlotAreaHotBar :
+	public cSlotAreaInventoryBase
+{
+	typedef cSlotAreaInventoryBase super;
+	
+public:
+	cSlotAreaHotBar(cWindow & a_ParentWindow)	:
+		cSlotAreaInventoryBase(cInventory::invHotbarCount, cInventory::invHotbarOffset, a_ParentWindow)
+	{
+	}
+} ;
+
+
+
+
+
+/// Handles the armor area of the player's inventory
+class cSlotAreaArmor :
+	public cSlotAreaInventoryBase
+{
+public:
+	cSlotAreaArmor(cWindow & a_ParentWindow)	:
+		cSlotAreaInventoryBase(cInventory::invArmorCount, cInventory::invArmorOffset, a_ParentWindow)
+	{
+	}
+
+	// Distributing the stack is allowed only for compatible items (helmets into helmet slot etc.)
+	virtual void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots) override;
+} ;
+
+
+
+
+
+/// Handles any slot area that is representing a cItemGrid; same items for all the players
+class cSlotAreaItemGrid :
+	public cSlotArea,
+	public cItemGrid::cListener
+{
+	typedef cSlotArea super;
+	
+public:
+	cSlotAreaItemGrid(cItemGrid & a_ItemGrid, cWindow & a_ParentWindow);
+	
+	virtual ~cSlotAreaItemGrid();
+	
+	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;
+
+protected:
+	cItemGrid & m_ItemGrid;
+	
+	// cItemGrid::cListener overrides:
+	virtual void OnSlotChanged(cItemGrid * a_ItemGrid, int a_SlotNum) override;
+} ;
+
+
+
+
+
+/** A cSlotArea with items layout that is private to each player and is temporary, such as
+a crafting grid or an enchantment table.
+This common ancestor stores the items in a per-player map. It also implements tossing items from the map.
+*/
+class cSlotAreaTemporary :
+	public cSlotArea
+{
+	typedef cSlotArea super;
+	
+public:
+	cSlotAreaTemporary(int a_NumSlots, cWindow & a_ParentWindow);
+	
+	// cSlotArea overrides:
+	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          OnPlayerAdded  (cPlayer & a_Player) override;
+	virtual void          OnPlayerRemoved(cPlayer & a_Player) override;
+	
+	/// Tosses the player's items in slots [a_Begin, a_End) (ie. incl. a_Begin, but excl. a_End)
+	void TossItems(cPlayer & a_Player, int a_Begin, int a_End);
+	
+protected:
+	typedef std::map<int, std::vector<cItem> > cItemMap;  // Maps EntityID -> items
+	
+	cItemMap m_Items;
+	
+	/// Returns the pointer to the slot array for the player specified.
+	cItem * GetPlayerSlots(cPlayer & a_Player);
+} ;
+
+
+
+
+
+class cSlotAreaCrafting :
+	public cSlotAreaTemporary
+{
+	typedef cSlotAreaTemporary super;
+	
+public:
+	/// a_GridSize is allowed to be only 2 or 3
+	cSlotAreaCrafting(int a_GridSize, cWindow & a_ParentWindow);
+
+	// cSlotAreaTemporary overrides:
+	virtual void Clicked        (cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem) override;
+	virtual void DblClicked     (cPlayer & a_Player, int a_SlotNum);
+	virtual void OnPlayerRemoved(cPlayer & a_Player) override;
+	
+	// Distributing items into this area is completely disabled
+	virtual void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots) override {}
+
+protected:
+	/// Maps player's EntityID -> current recipe; not a std::map because cCraftingGrid needs proper constructor params
+	typedef std::list<std::pair<int, cCraftingRecipe> > cRecipeMap;
+	
+	int        m_GridSize;
+	cRecipeMap m_Recipes;
+	
+	/// Handles a click in the result slot. Crafts using the current recipe, if possible
+	void ClickedResult(cPlayer & a_Player);
+	
+	/// Handles a shift-click in the result slot. Crafts using the current recipe until it changes or no more space for result.
+	void ShiftClickedResult(cPlayer & a_Player);
+	
+	/// Updates the current recipe and result slot based on the ingredients currently in the crafting grid of the specified player
+	void UpdateRecipe(cPlayer & a_Player);
+	
+	/// Retrieves the recipe for the specified player from the map, or creates one if not found
+	cCraftingRecipe & GetRecipeForPlayer(cPlayer & a_Player);
+} ;
+
+
+
+
+
+class cSlotAreaChest :
+	public cSlotArea
+{
+public:
+	cSlotAreaChest(cChestEntity * a_Chest, cWindow & a_ParentWindow);
+	
+	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;
+	
+protected:
+	cChestEntity * m_Chest;
+} ;
+
+
+
+
+
+class cSlotAreaDoubleChest :
+	public cSlotArea
+{
+public:
+	cSlotAreaDoubleChest(cChestEntity * a_TopChest, cChestEntity * a_BottomChest, cWindow & a_ParentWindow);
+	
+	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;
+	
+protected:
+	cChestEntity * m_TopChest;
+	cChestEntity * m_BottomChest;
+} ;
+
+
+
+
+
+class cSlotAreaFurnace :
+	public cSlotArea,
+	public cItemGrid::cListener
+{
+	typedef cSlotArea super;
+	
+public:
+	cSlotAreaFurnace(cFurnaceEntity * a_Furnace, cWindow & a_ParentWindow);
+	
+	virtual ~cSlotAreaFurnace();
+	
+	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;
+	
+protected:
+	cFurnaceEntity * m_Furnace;
+
+	// cItemGrid::cListener overrides:
+	virtual void OnSlotChanged(cItemGrid * a_ItemGrid, int a_SlotNum) override;
+} ;
+
+
+
+
diff --git a/src/UI/Window.cpp b/src/UI/Window.cpp
new file mode 100644
index 000000000..f5c62692f
--- /dev/null
+++ b/src/UI/Window.cpp
@@ -0,0 +1,886 @@
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "Window.h"
+#include "WindowOwner.h"
+#include "SlotArea.h"
+#include "../Item.h"
+#include "../ClientHandle.h"
+#include "../Entities/Player.h"
+#include "../Entities/Pickup.h"
+#include "../Inventory.h"
+#include "../Items/ItemHandler.h"
+#include "../BlockEntities/ChestEntity.h"
+#include "../BlockEntities/DropSpenserEntity.h"
+#include "../BlockEntities/HopperEntity.h"
+
+
+
+
+
+char cWindow::m_WindowIDCounter = 1;
+
+
+
+
+
+cWindow::cWindow(WindowType a_WindowType, const AString & a_WindowTitle) :
+	m_WindowID((++m_WindowIDCounter) % 127),
+	m_WindowType(a_WindowType),
+	m_WindowTitle(a_WindowTitle),
+	m_Owner(NULL),
+	m_IsDestroyed(false),
+	m_ShouldDistributeToHotbarFirst(true)
+{
+	if (a_WindowType == wtInventory)
+	{
+		m_WindowID = 0;
+	}
+}
+
+
+
+
+
+cWindow::~cWindow()
+{
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		delete *itr;
+	}
+	m_SlotAreas.clear();
+}
+
+
+
+
+
+int cWindow::GetNumSlots(void) const
+{
+	int res = 0;
+	for (cSlotAreas::const_iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		res += (*itr)->GetNumSlots();
+	}  // for itr - m_SlotAreas[]
+	return res;
+}
+
+
+
+
+
+const cItem * cWindow::GetSlot(cPlayer & a_Player, int a_SlotNum) const
+{
+	// Return the item at the specified slot for the specified player
+	int LocalSlotNum = 0;
+	const cSlotArea * Area = GetSlotArea(a_SlotNum, LocalSlotNum);
+	if (Area == NULL)
+	{
+		LOGWARNING("%s: requesting item from an invalid SlotArea (SlotNum %d), returning NULL.", __FUNCTION__, a_SlotNum);
+		return NULL;
+	}
+	return Area->GetSlot(LocalSlotNum, a_Player);
+}
+
+
+
+
+
+void cWindow::SetSlot(cPlayer & a_Player, int a_SlotNum, const cItem & a_Item)
+{
+	// Set the item to the specified slot for the specified player
+	int LocalSlotNum = 0;
+	cSlotArea * Area = GetSlotArea(a_SlotNum, LocalSlotNum);
+	if (Area == NULL)
+	{
+		LOGWARNING("%s: requesting write to an invalid SlotArea (SlotNum %d), ignoring.", __FUNCTION__, a_SlotNum);
+		return;
+	}
+	Area->SetSlot(LocalSlotNum, a_Player, a_Item);
+}
+
+
+
+
+
+bool cWindow::IsSlotInPlayerMainInventory(int a_SlotNum) const
+{
+	// Returns true if the specified slot is in the Player Main Inventory slotarea
+	// The player main inventory is always 27 slots, 9 slots from the end of the inventory
+	return ((a_SlotNum >= GetNumSlots() - 36) && (a_SlotNum < GetNumSlots() - 9));
+}
+
+
+
+
+
+bool cWindow::IsSlotInPlayerHotbar(int a_SlotNum) const
+{
+	// Returns true if the specified slot is in the Player Hotbar slotarea
+	// The hotbar is always the last 9 slots
+	return ((a_SlotNum >= GetNumSlots() - 9) && (a_SlotNum < GetNumSlots()));
+}
+
+
+
+
+
+bool cWindow::IsSlotInPlayerInventory(int a_SlotNum) const
+{
+	// Returns true if the specified slot is in the Player Main Inventory or Hotbar slotareas. Note that returns false for Armor.
+	// The player combined inventory is always the last 36 slots
+	return ((a_SlotNum >= GetNumSlots() - 36) && (a_SlotNum < GetNumSlots()));
+}
+
+
+
+
+
+void cWindow::GetSlots(cPlayer & a_Player, cItems & a_Slots) const
+{
+	a_Slots.clear();
+	a_Slots.reserve(GetNumSlots());
+	for (cSlotAreas::const_iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		int NumSlots = (*itr)->GetNumSlots();
+		for (int i = 0; i < NumSlots; i++)
+		{
+			
+			const cItem * Item = (*itr)->GetSlot(i, a_Player);
+			if (Item == NULL)
+			{
+				a_Slots.push_back(cItem());
+			}
+			else
+			{
+				a_Slots.push_back(*Item);
+			}
+		}
+	}  // for itr - m_SlotAreas[]
+}
+
+
+
+
+
+void cWindow::Clicked(
+	cPlayer & a_Player, 
+	int a_WindowID, short a_SlotNum, eClickAction a_ClickAction,
+	const cItem & a_ClickedItem
+)
+{
+	if (a_WindowID != m_WindowID)
+	{
+		LOGWARNING("%s: Wrong window ID (exp %d, got %d) received from \"%s\"; ignoring click.", __FUNCTION__, m_WindowID, a_WindowID, a_Player.GetName().c_str());
+		return;
+	}
+
+	switch (a_ClickAction)
+	{
+		case caRightClickOutside:
+		{
+			// Toss one of the dragged items:
+			a_Player.TossItem(true);
+			return;
+		}
+		case caLeftClickOutside:
+		{
+			// Toss all dragged items:
+			a_Player.TossItem(true, a_Player.GetDraggingItem().m_ItemCount);
+			return;
+		}
+		case caLeftClickOutsideHoldNothing:
+		case caRightClickOutsideHoldNothing:
+		{
+			// Nothing needed
+			return;
+		}
+		case caLeftPaintBegin:     OnPaintBegin   (a_Player);            return;
+		case caRightPaintBegin:    OnPaintBegin   (a_Player);            return;
+		case caLeftPaintProgress:  OnPaintProgress(a_Player, a_SlotNum); return;
+		case caRightPaintProgress: OnPaintProgress(a_Player, a_SlotNum); return;
+		case caLeftPaintEnd:       OnLeftPaintEnd (a_Player);            return;
+		case caRightPaintEnd:      OnRightPaintEnd(a_Player);            return;
+	}
+	
+	if (a_SlotNum < 0)
+	{
+		// TODO: Other click actions with irrelevant slot number (FS #371)
+		return;
+	}
+
+	int LocalSlotNum = a_SlotNum;
+	int idx = 0;
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (LocalSlotNum < (*itr)->GetNumSlots())
+		{
+			(*itr)->Clicked(a_Player, LocalSlotNum, a_ClickAction, a_ClickedItem);
+			return;
+		}
+		LocalSlotNum -= (*itr)->GetNumSlots();
+		idx++;
+	}
+	
+	LOGWARNING("Slot number higher than available window slots: %d, max %d received from \"%s\"; ignoring.",
+		a_SlotNum, GetNumSlots(), a_Player.GetName().c_str()
+	);
+}
+
+
+
+
+
+void cWindow::OpenedByPlayer(cPlayer & a_Player)
+{
+	{
+		cCSLock Lock(m_CS);
+		// If player is already in OpenedBy remove player first
+		m_OpenedBy.remove(&a_Player);
+		// Then add player
+		m_OpenedBy.push_back(&a_Player);
+		
+		for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+		{
+			(*itr)->OnPlayerAdded(a_Player);
+		}  // for itr - m_SlotAreas[]
+	}
+
+	a_Player.GetClientHandle()->SendWindowOpen(*this);
+}
+
+
+
+
+
+bool cWindow::ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse)
+{
+	// Checks whether the player is still holding an item
+	if (a_Player.IsDraggingItem())
+	{
+		LOGD("Player holds item! Dropping it...");
+		a_Player.TossItem(true, a_Player.GetDraggingItem().m_ItemCount);
+	}
+
+	cClientHandle * ClientHandle = a_Player.GetClientHandle();
+	if (ClientHandle != NULL)
+	{
+		ClientHandle->SendWindowClose(*this);
+	}
+
+	{
+		cCSLock Lock(m_CS);
+
+		for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+		{
+			(*itr)->OnPlayerRemoved(a_Player);
+		}  // for itr - m_SlotAreas[]
+
+		m_OpenedBy.remove(&a_Player);
+		
+		if ((m_WindowType != wtInventory) && m_OpenedBy.empty())
+		{
+			Destroy();
+		}
+	}
+	if (m_IsDestroyed)
+	{
+		delete this;
+	}
+	
+	return true;
+}
+
+
+
+
+
+void cWindow::OwnerDestroyed()
+{
+	m_Owner = NULL;
+	// Close window for each player. Note that the last one needs special handling
+	while (m_OpenedBy.size() > 1)
+	{
+		(*m_OpenedBy.begin() )->CloseWindow();
+	}
+	(*m_OpenedBy.begin() )->CloseWindow();
+}
+
+
+
+
+
+bool cWindow::ForEachPlayer(cItemCallback<cPlayer> & a_Callback)
+{
+	cCSLock Lock(m_CS);
+	for (cPlayerList::iterator itr = m_OpenedBy.begin(), end = m_OpenedBy.end(); itr != end; ++itr)
+	{
+		if (a_Callback.Item(*itr))
+		{
+			return false;
+		}
+	}  // for itr - m_OpenedBy[]
+	return true;
+}
+
+
+
+
+
+bool cWindow::ForEachClient(cItemCallback<cClientHandle> & a_Callback)
+{
+	cCSLock Lock(m_CS);
+	for (cPlayerList::iterator itr = m_OpenedBy.begin(), end = m_OpenedBy.end(); itr != end; ++itr)
+	{
+		if (a_Callback.Item((*itr)->GetClientHandle()))
+		{
+			return false;
+		}
+	}  // for itr - m_OpenedBy[]
+	return true;
+}
+
+
+
+
+
+void cWindow::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, cSlotArea * a_ExcludeArea, bool a_ShouldApply)
+{
+	// Ask each slot area to take as much of the stack as it can.
+	// First ask only slots that already have the same kind of item
+	// Then ask any remaining slots
+	for (int Pass = 0; Pass < 2; ++Pass)
+	{
+		if (m_ShouldDistributeToHotbarFirst)
+		{
+			// First distribute into the hotbar:
+			if (a_ExcludeArea != m_SlotAreas.back())
+			{
+				m_SlotAreas.back()->DistributeStack(a_ItemStack, a_Player, a_ShouldApply, (Pass == 0));
+				if (a_ItemStack.IsEmpty())
+				{
+					// Distributed it all
+					return;
+				}
+			}
+		}
+		
+		// The distribute to all other areas:
+		cSlotAreas::iterator end = m_ShouldDistributeToHotbarFirst ? (m_SlotAreas.end() - 1) : m_SlotAreas.end();
+		for (cSlotAreas::iterator itr = m_SlotAreas.begin(); itr != end; ++itr)
+		{
+			if (*itr == a_ExcludeArea)
+			{
+				continue;
+			}
+			(*itr)->DistributeStack(a_ItemStack, a_Player, a_ShouldApply, (Pass == 0));
+			if (a_ItemStack.IsEmpty())
+			{
+				// Distributed it all
+				return;
+			}
+		}  // for itr - m_SlotAreas[]
+	}  // for Pass - repeat twice
+}
+
+
+
+
+
+bool cWindow::CollectItemsToHand(cItem & a_Dragging, cSlotArea & a_Area, cPlayer & a_Player, bool a_CollectFullStacks)
+{
+	// First ask the slot areas from a_Area till the end of list:
+	bool ShouldCollect = false;
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (&a_Area == *itr)
+		{
+			ShouldCollect = true;
+		}
+		if (!ShouldCollect)
+		{
+			continue;
+		}
+		if ((*itr)->CollectItemsToHand(a_Dragging, a_Player, a_CollectFullStacks))
+		{
+			// a_Dragging is full
+			return true;
+		}
+	}
+	
+	// a_Dragging still not full, ask slot areas before a_Area in the list:
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (*itr == &a_Area)
+		{
+			// All areas processed
+			return false;
+		}
+		if ((*itr)->CollectItemsToHand(a_Dragging, a_Player, a_CollectFullStacks))
+		{
+			// a_Dragging is full
+			return true;
+		}
+	}
+	// Shouldn't reach here
+	// a_Area is expected to be part of m_SlotAreas[], so the "return false" in the loop above should have returned already
+	ASSERT(!"This branch should not be reached");
+	return false;
+}
+
+
+
+
+
+void cWindow::SendSlot(cPlayer & a_Player, cSlotArea * a_SlotArea, int a_RelativeSlotNum)
+{
+	int SlotBase = 0;
+	bool Found = false;
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (*itr == a_SlotArea)
+		{
+			Found = true;
+			break;
+		}
+		SlotBase += (*itr)->GetNumSlots();
+	}  // for itr - m_SlotAreas[]
+	if (!Found)
+	{
+		LOGERROR("cWindow::SendSlot(): unknown a_SlotArea");
+		ASSERT(!"cWindow::SendSlot(): unknown a_SlotArea");
+		return;
+	}
+	
+	a_Player.GetClientHandle()->SendInventorySlot(
+		m_WindowID, a_RelativeSlotNum + SlotBase, *(a_SlotArea->GetSlot(a_RelativeSlotNum, a_Player))
+	);
+}
+
+
+
+
+
+void cWindow::Destroy(void)
+{
+	if (m_Owner != NULL)
+	{
+		m_Owner->CloseWindow();
+		m_Owner = NULL;
+	}
+	m_IsDestroyed = true;
+}
+
+
+
+
+
+cSlotArea * cWindow::GetSlotArea(int a_GlobalSlotNum, int & a_LocalSlotNum)
+{
+	if ((a_GlobalSlotNum < 0) || (a_GlobalSlotNum >= GetNumSlots()))
+	{
+		LOGWARNING("%s: requesting an invalid SlotNum: %d out of %d slots", __FUNCTION__, a_GlobalSlotNum, GetNumSlots() - 1);
+		ASSERT(!"Invalid SlotNum");
+		return NULL;
+	}
+	
+	// Iterate through all the SlotAreas, find the correct one
+	int LocalSlotNum = a_GlobalSlotNum;
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (LocalSlotNum < (*itr)->GetNumSlots())
+		{
+			a_LocalSlotNum = LocalSlotNum;
+			return *itr;
+		}
+		LocalSlotNum -= (*itr)->GetNumSlots();
+	}  // for itr - m_SlotAreas[]
+	
+	// We shouldn't be here - the check at the beginnning should prevent this. Log and assert
+	LOGWARNING("%s: GetNumSlots() is out of sync: %d; LocalSlotNum = %d", __FUNCTION__, GetNumSlots(), LocalSlotNum);
+	ASSERT(!"Invalid GetNumSlots");
+	return NULL;
+}
+
+
+
+
+
+const cSlotArea * cWindow::GetSlotArea(int a_GlobalSlotNum, int & a_LocalSlotNum) const
+{
+	if ((a_GlobalSlotNum < 0) || (a_GlobalSlotNum >= GetNumSlots()))
+	{
+		LOGWARNING("%s: requesting an invalid SlotNum: %d out of %d slots", __FUNCTION__, a_GlobalSlotNum, GetNumSlots() - 1);
+		ASSERT(!"Invalid SlotNum");
+		return NULL;
+	}
+	
+	// Iterate through all the SlotAreas, find the correct one
+	int LocalSlotNum = a_GlobalSlotNum;
+	for (cSlotAreas::const_iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (LocalSlotNum < (*itr)->GetNumSlots())
+		{
+			a_LocalSlotNum = LocalSlotNum;
+			return *itr;
+		}
+		LocalSlotNum -= (*itr)->GetNumSlots();
+	}  // for itr - m_SlotAreas[]
+	
+	// We shouldn't be here - the check at the beginnning should prevent this. Log and assert
+	LOGWARNING("%s: GetNumSlots() is out of sync: %d; LocalSlotNum = %d", __FUNCTION__, GetNumSlots(), LocalSlotNum);
+	ASSERT(!"Invalid GetNumSlots");
+	return NULL;
+}
+
+
+
+
+
+void cWindow::OnPaintBegin(cPlayer & a_Player)
+{
+	// Prepares the internal structures for inventory painting from the specified player
+	a_Player.ClearInventoryPaintSlots();
+}
+
+
+
+
+
+void cWindow::OnPaintProgress(cPlayer & a_Player, int a_SlotNum)
+{
+	// Add the slot to the internal structures for inventory painting by the specified player
+	a_Player.AddInventoryPaintSlot(a_SlotNum);
+}
+
+
+
+
+
+void cWindow::OnLeftPaintEnd(cPlayer & a_Player)
+{
+	// Process the entire action stored in the internal structures for inventory painting
+	// distribute as many items as possible
+	
+	const cSlotNums & SlotNums = a_Player.GetInventoryPaintSlots();
+	cItem ToDistribute(a_Player.GetDraggingItem());
+	int ToEachSlot = (int)ToDistribute.m_ItemCount / SlotNums.size();
+	
+	int NumDistributed = DistributeItemToSlots(a_Player, ToDistribute, ToEachSlot, SlotNums);
+	
+	// Remove the items distributed from the dragging item:
+	a_Player.GetDraggingItem().m_ItemCount -= NumDistributed;
+	if (a_Player.GetDraggingItem().m_ItemCount == 0)
+	{
+		a_Player.GetDraggingItem().Empty();
+	}
+	
+	SendWholeWindow(*a_Player.GetClientHandle());
+}
+
+
+
+
+
+void cWindow::OnRightPaintEnd(cPlayer & a_Player)
+{
+	// Process the entire action stored in the internal structures for inventory painting
+	// distribute one item into each slot
+
+	const cSlotNums & SlotNums = a_Player.GetInventoryPaintSlots();
+	cItem ToDistribute(a_Player.GetDraggingItem());
+	
+	int NumDistributed = DistributeItemToSlots(a_Player, ToDistribute, 1, SlotNums);
+	
+	// Remove the items distributed from the dragging item:
+	a_Player.GetDraggingItem().m_ItemCount -= NumDistributed;
+	if (a_Player.GetDraggingItem().m_ItemCount == 0)
+	{
+		a_Player.GetDraggingItem().Empty();
+	}
+	
+	SendWholeWindow(*a_Player.GetClientHandle());
+}
+
+
+
+
+
+int cWindow::DistributeItemToSlots(cPlayer & a_Player, const cItem & a_Item, int a_NumToEachSlot, const cSlotNums & a_SlotNums)
+{
+	if ((size_t)(a_Item.m_ItemCount) < a_SlotNums.size())
+	{
+		LOGWARNING("%s: Distributing less items (%d) than slots (%u)", __FUNCTION__, (int)a_Item.m_ItemCount, a_SlotNums.size());
+		// This doesn't seem to happen with the 1.5.1 client, so we don't worry about it for now
+		return 0;
+	}
+	
+	// Distribute to individual slots, keep track of how many items were actually distributed (full stacks etc.)
+	int NumDistributed = 0;
+	for (cSlotNums::const_iterator itr = a_SlotNums.begin(), end = a_SlotNums.end(); itr != end; ++itr)
+	{
+		int LocalSlotNum = 0;
+		cSlotArea * Area = GetSlotArea(*itr, LocalSlotNum);
+		if (Area == NULL)
+		{
+			LOGWARNING("%s: Bad SlotArea for slot %d", __FUNCTION__, *itr);
+			continue;
+		}
+		
+		// Modify the item at the slot
+		cItem AtSlot(*Area->GetSlot(LocalSlotNum, a_Player));
+		int MaxStack = AtSlot.GetMaxStackSize();
+		if (AtSlot.IsEmpty())
+		{
+			// Empty, just move all of it there:
+			cItem ToStore(a_Item);
+			ToStore.m_ItemCount = std::min(a_NumToEachSlot, (int)MaxStack);
+			Area->SetSlot(LocalSlotNum, a_Player, ToStore);
+			NumDistributed += ToStore.m_ItemCount;
+		}
+		else if (AtSlot.IsStackableWith(a_Item))
+		{
+			// Occupied, add and cap at MaxStack:
+			int CanStore = std::min(a_NumToEachSlot, (int)MaxStack - AtSlot.m_ItemCount);
+			AtSlot.m_ItemCount += CanStore;
+			Area->SetSlot(LocalSlotNum, a_Player, AtSlot);
+			NumDistributed += CanStore;
+		}
+	}  // for itr - SlotNums[]
+	return NumDistributed;
+}
+
+
+
+
+
+void cWindow::BroadcastSlot(cSlotArea * a_Area, int a_LocalSlotNum)
+{
+	// Translate local slot num into global slot num:
+	int SlotNum = 0;
+	bool HasFound = false;
+	for (cSlotAreas::const_iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (a_Area == *itr)
+		{
+			SlotNum += a_LocalSlotNum;
+			HasFound = true;
+			break;
+		}
+		SlotNum += (*itr)->GetNumSlots();
+	}  // for itr - m_SlotAreas[]
+	if (!HasFound)
+	{
+		LOGWARNING("%s: Invalid slot area parameter", __FUNCTION__);
+		ASSERT(!"Invalid slot area");
+		return;
+	}
+	
+	// Broadcast the update packet:
+	cCSLock Lock(m_CS);
+	for (cPlayerList::iterator itr = m_OpenedBy.begin(); itr != m_OpenedBy.end(); ++itr)
+	{
+		(*itr)->GetClientHandle()->SendInventorySlot(m_WindowID, SlotNum, *a_Area->GetSlot(a_LocalSlotNum, **itr));
+	}  // for itr - m_OpenedBy[]
+}
+
+
+
+
+
+void cWindow::SendWholeWindow(cClientHandle & a_Client)
+{
+	a_Client.SendWholeInventory(*this);
+}
+
+
+
+
+
+void cWindow::BroadcastWholeWindow(void)
+{
+	cCSLock Lock(m_CS);
+	for (cPlayerList::iterator itr = m_OpenedBy.begin(); itr != m_OpenedBy.end(); ++itr)
+	{
+		SendWholeWindow(*(*itr)->GetClientHandle());
+	}  // for itr - m_OpenedBy[]
+}
+
+
+
+
+
+void cWindow::BroadcastProgress(int a_Progressbar, int a_Value)
+{
+	cCSLock Lock(m_CS);
+	for (cPlayerList::iterator itr = m_OpenedBy.begin(); itr != m_OpenedBy.end(); ++itr)
+	{
+		(*itr)->GetClientHandle()->SendWindowProperty(*this, a_Progressbar, a_Value);
+	}  // for itr - m_OpenedBy[]
+}
+
+
+
+
+
+void cWindow::SetProperty(int a_Property, int a_Value)
+{
+	cCSLock Lock(m_CS);
+	for (cPlayerList::iterator itr = m_OpenedBy.begin(), end = m_OpenedBy.end(); itr != end; ++itr)
+	{
+		(*itr)->GetClientHandle()->SendWindowProperty(*this, a_Property, a_Value);
+	}  // for itr - m_OpenedBy[]
+}
+
+
+
+
+
+void cWindow::SetProperty(int a_Property, int a_Value, cPlayer & a_Player)
+{
+	a_Player.GetClientHandle()->SendWindowProperty(*this, a_Property, a_Value);
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cInventoryWindow:
+
+cInventoryWindow::cInventoryWindow(cPlayer & a_Player) :
+	cWindow(wtInventory, "Inventory"),
+	m_Player(a_Player)
+{
+	m_SlotAreas.push_back(new cSlotAreaCrafting(2, *this));  // The creative inventory doesn't display it, but it's still counted into slot numbers
+	m_SlotAreas.push_back(new cSlotAreaArmor(*this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cCraftingWindow:
+
+cCraftingWindow::cCraftingWindow(int a_BlockX, int a_BlockY, int a_BlockZ) :
+	cWindow(wtWorkbench, "Crafting Table")
+{
+	m_SlotAreas.push_back(new cSlotAreaCrafting(3, *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cChestWindow:
+
+cChestWindow::cChestWindow(cChestEntity * a_Chest) :
+	cWindow(wtChest, "Chest"),
+	m_World(a_Chest->GetWorld()),
+	m_BlockX(a_Chest->GetPosX()),
+	m_BlockY(a_Chest->GetPosY()),
+	m_BlockZ(a_Chest->GetPosZ())
+{
+	m_SlotAreas.push_back(new cSlotAreaChest(a_Chest, *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+	
+	// Play the opening sound:
+	m_World->BroadcastSoundEffect("random.chestopen", m_BlockX * 8, m_BlockY * 8, m_BlockZ * 8, 1, 1);
+
+	// Send out the chest-open packet:
+	m_World->BroadcastBlockAction(m_BlockX, m_BlockY, m_BlockZ, 1, 1, E_BLOCK_CHEST);
+}
+
+
+
+
+
+cChestWindow::cChestWindow(cChestEntity * a_PrimaryChest, cChestEntity * a_SecondaryChest) :
+	cWindow(wtChest, "Double Chest"),
+	m_World(a_PrimaryChest->GetWorld()),
+	m_BlockX(a_PrimaryChest->GetPosX()),
+	m_BlockY(a_PrimaryChest->GetPosY()),
+	m_BlockZ(a_PrimaryChest->GetPosZ())
+{
+	m_SlotAreas.push_back(new cSlotAreaDoubleChest(a_PrimaryChest, a_SecondaryChest, *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+	
+	m_ShouldDistributeToHotbarFirst = false;
+	
+	// Play the opening sound:
+	m_World->BroadcastSoundEffect("random.chestopen", m_BlockX * 8, m_BlockY * 8, m_BlockZ * 8, 1, 1);
+
+	// Send out the chest-open packet:
+	m_World->BroadcastBlockAction(m_BlockX, m_BlockY, m_BlockZ, 1, 1, E_BLOCK_CHEST);
+}
+
+
+
+
+
+cChestWindow::~cChestWindow()
+{
+	// Send out the chest-close packet:
+	m_World->BroadcastBlockAction(m_BlockX, m_BlockY, m_BlockZ, 1, 0, E_BLOCK_CHEST);
+
+	m_World->BroadcastSoundEffect("random.chestclosed", m_BlockX * 8, m_BlockY * 8, m_BlockZ * 8, 1, 1);
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cDropSpenserWindow:
+
+cDropSpenserWindow::cDropSpenserWindow(int a_BlockX, int a_BlockY, int a_BlockZ, cDropSpenserEntity * a_DropSpenser) :
+	cWindow(wtDropSpenser, "Dropspenser")
+{
+	m_ShouldDistributeToHotbarFirst = false;
+	m_SlotAreas.push_back(new cSlotAreaItemGrid(a_DropSpenser->GetContents(), *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHopperWindow:
+
+cHopperWindow::cHopperWindow(int a_BlockX, int a_BlockY, int a_BlockZ, cHopperEntity * a_Hopper) :
+	super(wtHopper, "Hopper")
+{
+	m_ShouldDistributeToHotbarFirst = false;
+	m_SlotAreas.push_back(new cSlotAreaItemGrid(a_Hopper->GetContents(), *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cFurnaceWindow:
+
+cFurnaceWindow::cFurnaceWindow(int a_BlockX, int a_BlockY, int a_BlockZ, cFurnaceEntity * a_Furnace) :
+	cWindow(wtFurnace, "Furnace")
+{
+	m_ShouldDistributeToHotbarFirst = false;
+	m_SlotAreas.push_back(new cSlotAreaFurnace(a_Furnace, *this));
+	m_SlotAreas.push_back(new cSlotAreaInventory(*this));
+	m_SlotAreas.push_back(new cSlotAreaHotBar(*this));
+}
+
+
+
+
diff --git a/src/UI/Window.h b/src/UI/Window.h
new file mode 100644
index 000000000..c44b900d7
--- /dev/null
+++ b/src/UI/Window.h
@@ -0,0 +1,300 @@
+
+// Window.h
+
+// Interfaces to the cWindow class representing a UI window for a specific block
+
+
+
+
+
+#pragma once
+
+#include "../ItemGrid.h"
+
+
+
+
+
+class cPlayer;
+class cWindowOwner;
+class cClientHandle;
+class cChestEntity;
+class cDropSpenserEntity;
+class cFurnaceEntity;
+class cHopperEntity;
+class cSlotArea;
+class cWorld;
+
+typedef std::list<cPlayer *> cPlayerList;
+typedef std::vector<cSlotArea *> cSlotAreas;
+
+
+
+
+
+// tolua_begin
+
+/** 
+Represents a UI window.
+
+Each window has a list of players that are currently using it
+When there's no player using a window, it is destroyed.
+A window consists of several areas of slots with similar functionality - for example the crafting grid area, or 
+the inventory area. Each area knows what its slots are (GetSlot() function) and can handle mouse clicks.
+The window acts only as a top-level container for those areas, redirecting the click events to the correct areas.
+Inventory painting, introduced in 1.5, is handled by the window, too
+*/
+class cWindow
+{
+public:
+	enum WindowType
+	{
+		wtInventory   = -1,  // This value is never actually sent to a client
+		wtChest       = 0,
+		wtWorkbench   = 1,
+		wtFurnace     = 2,
+		wtDropSpenser = 3,  // Dropper or Dispenser
+		wtEnchantment = 4,
+		wtBrewery     = 5,
+		wtNPCTrade    = 6,
+		wtBeacon      = 7,
+		wtAnvil       = 8,
+		wtHopper      = 9,
+		// Unknown: 10
+		wtAnimalChest = 11,
+	};
+	
+	// tolua_end
+	
+	static const int c_NumInventorySlots = 36;
+
+	cWindow(WindowType a_WindowType, const AString & a_WindowTitle);
+	virtual ~cWindow();
+
+	char GetWindowID(void) const { return m_WindowID; }  // tolua_export
+	int GetWindowType(void) const { return m_WindowType; }  // tolua_export
+
+	cWindowOwner * GetOwner(void) { return m_Owner; }
+	void SetOwner( cWindowOwner * a_Owner ) { m_Owner = a_Owner; }
+	
+	/// Returns the total number of slots
+	int GetNumSlots(void) const;
+	
+	/// Returns the number of slots, excluding the player's inventory (used for network protocols)
+	int GetNumNonInventorySlots(void) const { return GetNumSlots() - c_NumInventorySlots; }
+	
+	// tolua_begin
+	
+	/// Returns the item at the specified slot for the specified player. Returns NULL if invalid SlotNum requested
+	const cItem * GetSlot(cPlayer & a_Player, int a_SlotNum) const;
+	
+	/// Sets the item to the specified slot for the specified player
+	void SetSlot(cPlayer & a_Player, int a_SlotNum, const cItem & a_Item);
+	
+	/// Returns true if the specified slot is in the Player Main Inventory slotarea
+	bool IsSlotInPlayerMainInventory(int a_SlotNum) const;
+	
+	/// Returns true if the specified slot is in the Player Hotbar slotarea
+	bool IsSlotInPlayerHotbar(int a_SlotNum) const;
+	
+	/// Returns true if the specified slot is in the Player Main Inventory or Hotbar slotareas. Note that returns false for Armor.
+	bool IsSlotInPlayerInventory(int a_SlotNum) const;
+	
+	// tolua_end
+	
+	/// Fills a_Slots with the slots read from m_SlotAreas[], for the specified player
+	void GetSlots(cPlayer & a_Player, cItems & a_Slots) const;
+
+	/// Handles a click event from a player
+	void Clicked(
+		cPlayer & a_Player, int a_WindowID, 
+		short a_SlotNum, eClickAction a_ClickAction,
+		const cItem & a_ClickedItem
+	);
+
+	void OpenedByPlayer(cPlayer & a_Player);
+	
+	/// Called when a player closes this window; notifies all slot areas. Returns true if close accepted
+	virtual bool ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse);
+
+	/// Sends the specified slot's contents to all clients of this window; the slot is specified as local in an area
+	void BroadcastSlot(cSlotArea * a_Area, int a_LocalSlotNum);
+	
+	/// Sends the contents of the whole window to the specified client
+	void SendWholeWindow(cClientHandle & a_Client);
+	
+	/// Sends the contents of the whole window to all clients of this window.
+	void BroadcastWholeWindow(void);
+	
+	/// Sends the progressbar to all clients of this window (same as SetProperty)
+	void BroadcastProgress(int a_Progressbar, int a_Value);
+
+	// tolua_begin
+	
+	const AString & GetWindowTitle() const { return m_WindowTitle; }
+	void SetWindowTitle(const AString & a_WindowTitle ) { m_WindowTitle = a_WindowTitle; }
+	
+	/// Sends the UpdateWindowProperty (0x69) packet to all clients of the window
+	void SetProperty(int a_Property, int a_Value);
+	
+	/// Sends the UpdateWindowPropert(0x69) packet to the specified player
+	void SetProperty(int a_Property, int a_Value, cPlayer & a_Player);
+	
+	// tolua_end
+
+	void OwnerDestroyed(void);
+	
+	/// Calls the callback safely for each player that has this window open; returns true if all players have been enumerated
+	bool ForEachPlayer(cItemCallback<cPlayer> & a_Callback);
+
+	/// Calls the callback safely for each client that has this window open; returns true if all clients have been enumerated
+	bool ForEachClient(cItemCallback<cClientHandle> & a_Callback);
+	
+	/** Called on shift-clicking to distribute the stack into other areas; Modifies a_ItemStack as it is distributed!
+	if a_ShouldApply is true, the changes are written into the slots;
+	if a_ShouldApply is false, only a_ItemStack is modified to reflect the number of fits (for fit-testing purposes)
+	*/
+	void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, cSlotArea * a_ExcludeArea, bool a_ShouldApply);
+	
+	/// Called on DblClicking to collect all stackable items from all areas into hand, starting with the specified area.
+	/// The items are accumulated in a_Dragging and removed from the SlotAreas immediately.
+	/// If a_CollectFullStacks is false, slots with full stacks in the area are skipped while collecting.
+	/// Returns true if full stack has been collected, false if there's space remaining to fill.
+	bool CollectItemsToHand(cItem & a_Dragging, cSlotArea & a_Area, cPlayer & a_Player, bool a_CollectFullStacks);
+	
+	/// Used by cSlotAreas to send individual slots to clients, a_RelativeSlotNum is the slot number relative to a_SlotArea
+	void SendSlot(cPlayer & a_Player, cSlotArea * a_SlotArea, int a_RelativeSlotNum);
+	
+protected:
+	cSlotAreas m_SlotAreas;
+	
+	char    m_WindowID;
+	int     m_WindowType;
+	AString m_WindowTitle;
+
+	cCriticalSection m_CS;
+	cPlayerList      m_OpenedBy;
+	
+	bool m_IsDestroyed;
+	bool m_ShouldDistributeToHotbarFirst;  ///< If set (default), shift+click tries to distribute to hotbar first, then other areas. False for doublechests
+	
+	cWindowOwner * m_Owner;
+	
+	static char m_WindowIDCounter;
+
+	/// Sets the internal flag as "destroyed"; notifies the owner that the window is destroying
+	virtual void Destroy(void);
+	
+	/** Returns the correct slot area for the specified window-global SlotNum
+	Also returns the area-local SlotNum corresponding to the GlobalSlotNum
+	If the global SlotNum is out of range, returns NULL
+	*/
+	cSlotArea * GetSlotArea(int a_GlobalSlotNum, int & a_LocalSlotNum);
+	
+	/** Returns the correct slot area for the specified window-global SlotNum
+	Also returns the area-local SlotNum corresponding to the GlobalSlotNum
+	If the global SlotNum is out of range, returns NULL.
+	Const version.
+	*/
+	const cSlotArea * GetSlotArea(int a_GlobalSlotNum, int & a_LocalSlotNum) const;
+	
+	/// Prepares the internal structures for inventory painting from the specified player
+	void OnPaintBegin(cPlayer & a_Player);
+	
+	/// Adds the slot to the internal structures for inventory painting by the specified player
+	void OnPaintProgress(cPlayer & a_Player, int a_SlotNum);
+	
+	/// Processes the entire action stored in the internal structures for inventory painting; distributes as many items as possible
+	void OnLeftPaintEnd(cPlayer & a_Player);
+
+	/// Processes the entire action stored in the internal structures for inventory painting; distributes one item into each slot
+	void OnRightPaintEnd(cPlayer & a_Player);
+	
+	/// Distributes a_NumToEachSlot items into the slots specified in a_SlotNums; returns the total number of items distributed
+	int DistributeItemToSlots(cPlayer & a_Player, const cItem & a_Item, int a_NumToEachSlot, const cSlotNums & a_SlotNums);
+} ;  // tolua_export
+
+
+
+
+
+class cCraftingWindow :
+	public cWindow
+{
+	typedef cWindow super;
+public:
+	cCraftingWindow(int a_BlockX, int a_BlockY, int a_BlockZ);
+} ;
+
+
+
+
+
+class cFurnaceWindow :
+	public cWindow
+{
+	typedef cWindow super;
+public:
+	cFurnaceWindow(int a_BlockX, int a_BlockY, int a_BlockZ, cFurnaceEntity * a_Furnace);
+} ;
+
+
+
+
+
+class cDropSpenserWindow :
+	public cWindow
+{
+	typedef cWindow super;
+public:
+	cDropSpenserWindow(int a_BlockX, int a_BlockY, int a_BlockZ, cDropSpenserEntity * a_Dispenser);
+} ;
+
+
+
+
+
+class cHopperWindow :
+	public cWindow
+{
+	typedef cWindow super;
+public:
+	cHopperWindow(int a_BlockX, int a_BlockY, int a_BlockZ, cHopperEntity * a_Hopper);
+} ;
+
+
+
+
+
+class cChestWindow :
+	public cWindow
+{
+public:
+	cChestWindow(cChestEntity * a_Chest);
+	cChestWindow(cChestEntity * a_PrimaryChest, cChestEntity * a_SecondaryChest);
+	~cChestWindow();
+	
+protected:
+	cWorld * m_World;
+	int m_BlockX, m_BlockY, m_BlockZ;  // Position of the chest, for the window-close packet
+} ;
+
+
+
+
+
+class cInventoryWindow :
+	public cWindow
+{
+public:
+	cInventoryWindow(cPlayer & a_Player);
+	
+protected:
+	cPlayer & m_Player;
+
+} ;
+
+
+
+
+
diff --git a/src/UI/WindowOwner.h b/src/UI/WindowOwner.h
new file mode 100644
index 000000000..d41abf66d
--- /dev/null
+++ b/src/UI/WindowOwner.h
@@ -0,0 +1,125 @@
+
+#pragma once
+
+#include "../BlockEntities/BlockEntity.h"
+#include "../Entities/Entity.h"
+#include "Window.h"
+
+/*
+Being a descendant of cWindowOwner means that the class can own one window. That window can be 
+queried, opened by other players, closed by players and finally destroyed.
+Also, a cWindowOwner can be queried for the block coords where the window is displayed. That will be used
+for entities / players in motion to close their windows when they get too far away from the window "source".
+*/
+
+
+
+
+
+// class cWindow;
+
+
+
+
+
+/**
+Base class for the window owning
+*/
+class cWindowOwner
+{
+public:
+	cWindowOwner() :
+		m_Window(NULL)
+	{
+	}
+	
+	void CloseWindow(void)
+	{
+		m_Window = NULL;
+	}
+	
+	void OpenWindow(cWindow * a_Window)
+	{
+		m_Window = a_Window;
+		m_Window->SetOwner(this);
+	}
+
+	cWindow * GetWindow(void) const
+	{
+		return m_Window;
+	}
+
+	/// Returns the block position at which the element owning the window is
+	virtual void GetBlockPos(int & a_BlockX, int & a_BlockY, int & a_BlockZ) = 0;
+	
+private:
+	cWindow * m_Window;
+} ;
+
+
+
+
+
+/**
+Window owner that is associated with a block entity (chest, furnace, ...)
+*/
+class cBlockEntityWindowOwner :
+	public cWindowOwner
+{
+public:
+	cBlockEntityWindowOwner(void) :
+		m_BlockEntity(NULL)
+	{
+	}
+	
+	void SetBlockEntity(cBlockEntity * a_BlockEntity)
+	{
+		m_BlockEntity = a_BlockEntity;
+	}
+	
+	virtual void GetBlockPos(int & a_BlockX, int & a_BlockY, int & a_BlockZ) override
+	{
+		a_BlockX = m_BlockEntity->GetPosX();
+		a_BlockY = m_BlockEntity->GetPosY();
+		a_BlockZ = m_BlockEntity->GetPosZ();
+	}
+	
+private:
+	cBlockEntity * m_BlockEntity;
+} ;
+
+
+
+
+
+/**
+Window owner that is associated with an entity (chest minecart)
+*/
+class cEntityWindowOwner :
+	public cWindowOwner
+{
+public:
+	cEntityWindowOwner(void) :
+		m_Entity(NULL)
+	{
+	}
+	
+	void SetEntity(cEntity * a_Entity)
+	{
+		m_Entity = a_Entity;
+	}
+
+	virtual void GetBlockPos(int & a_BlockX, int & a_BlockY, int & a_BlockZ) override
+	{
+		a_BlockX = (int)floor(m_Entity->GetPosX() + 0.5);
+		a_BlockY = (int)floor(m_Entity->GetPosY() + 0.5);
+		a_BlockZ = (int)floor(m_Entity->GetPosZ() + 0.5);
+	}
+	
+private:
+	cEntity * m_Entity;
+} ;
+
+
+
+