Added hopper entity, it can suck items out of chests, dispensers, droppers and other hopppers above it.

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1587 0a769ca7-a7f5-676a-18bf-c427514a06d6

source/BlockEntities/HopperEntity.h

@@ -0,0 +1,81 @@
+
+// HopperEntity.h
+
+// Declares the cHopperEntity representing a hopper block entity
+
+
+
+
+
+#pragma once
+
+#include "BlockEntityWithItems.h"
+#include "../UI/WindowOwner.h"
+
+
+
+
+
+class cHopperEntity :  // tolua_export
+	public cBlockEntityWindowOwner,
+	// tolua_begin
+	public cBlockEntityWithItems
+{
+	typedef cBlockEntityWithItems super;
+
+public:
+	enum {
+		ContentsHeight = 1,
+		ContentsWidth  = 5,
+		TICKS_PER_TRANSFER = 8,  ///< How many ticks at minimum between two item transfers to or from the hopper
+	} ;
+
+	/// Constructor used while generating a chunk; sets m_World to NULL
+	cHopperEntity(int a_BlockX, int a_BlockY, int a_BlockZ);
+	
+	// tolua_end
+	
+	/// Constructor used for normal operation
+	cHopperEntity(int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World);
+	
+	static const char * GetClassStatic(void) { return "cHopperEntity"; }
+	
+protected:
+
+	Int64 m_LastMoveItemsInTick;
+	Int64 m_LastMoveItemsOutTick;
+
+	// cBlockEntity overrides:
+	virtual bool Tick(float a_Dt, cChunk & a_Chunk) override;
+	virtual void SaveToJson(Json::Value & a_Value) override;
+	virtual void SendTo(cClientHandle & a_Client) override;
+	virtual void UsedBy(cPlayer * a_Player) override;
+	
+	/// Opens a new chest window for this chest. Scans for neighbors to open a double chest window, if appropriate.
+	void OpenNewWindow(void);
+
+	/// Moves items from the container above it into this hopper. Returns true if the contents have changed.
+	bool MoveItemsIn(cChunk & a_Chunk, Int64 a_CurrentTick);
+	
+	/// Moves pickups from above this hopper into it. Returns true if the contents have changed.
+	bool MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick);
+	
+	/// Moves items out from this hopper into the destination. Returns true if the contents have changed.
+	bool MoveItemsOut(cChunk & a_Chunk, Int64 a_CurrentTick);
+	
+	/// Moves items from a chest (dblchest) above the hopper into this hopper. Returns true if contents have changed.
+	bool MoveItemsFromChest(cChunk & a_Chunk);
+	
+	/// Moves items from a furnace above the hopper into this hopper. Returns true if contents have changed.
+	bool MoveItemsFromFurnace(cChunk & a_Chunk);
+	
+	/// Moves items from the specified ItemGrid into this hopper. Returns true if contents have changed.
+	bool MoveItemsFromGrid(cItemGrid & a_Grid);
+	
+	/// Moves one of the specified itemstack into this hopper. Returns true if contents have changed. Doesn't change the itemstack.
+	bool MoveItemsFromSlot(const cItem & a_ItemStack, bool a_AllowNewStacks);
+} ;
+
+
+
+