C++ InventoryList::getItem方法代码示例

void Client::clickActiveObject(u8 button, u16 id, u16 item_i)
{
	if(connectedAndInitialized() == false){
		infostream<<"Client::clickActiveObject() "
				"cancelled (not connected)"
				<<std::endl;
		return;
	}

	Player *player = m_env.getLocalPlayer();
	if(player == NULL)
		return;

	ClientActiveObject *obj = m_env.getActiveObject(id);
	if(obj){
		if(button == 0){
			ToolItem *titem = NULL;
			std::string toolname = "";

			InventoryList *mlist = player->inventory.getList("main");
			if(mlist != NULL)
			{
				InventoryItem *item = mlist->getItem(item_i);
				if(item && (std::string)item->getName() == "ToolItem")
				{
					titem = (ToolItem*)item;
					toolname = titem->getToolName();
				}
			}

			v3f playerpos = player->getPosition();
			v3f objpos = obj->getPosition();
			v3f dir = (objpos - playerpos).normalize();

			bool disable_send = obj->directReportPunch(toolname, dir);

			if(disable_send)
				return;
		}
	}

	/*
		length: 7
		[0] u16 command
		[2] u8 button (0=left, 1=right)
		[3] u16 id
		[5] u16 item
	*/
	u8 datasize = 2 + 1 + 6 + 2 + 2;
	SharedBuffer<u8> data(datasize);
	writeU16(&data[0], TOSERVER_CLICK_ACTIVEOBJECT);
	writeU8(&data[2], button);
	writeU16(&data[3], id);
	writeU16(&data[5], item_i);
	Send(0, data, true);
}

void GUIInventoryMenu::drawList(const ListDrawSpec &s)
{
	video::IVideoDriver* driver = Environment->getVideoDriver();

	// Get font
	gui::IGUIFont *font = NULL;
	gui::IGUISkin* skin = Environment->getSkin();
	if (skin)
		font = skin->getFont();
	
	Inventory *inv = m_invmgr->getInventory(m_c, s.inventoryname);
	assert(inv);
	InventoryList *ilist = inv->getList(s.listname);
	
	core::rect<s32> imgrect(0,0,imgsize.X,imgsize.Y);
	
	for(s32 i=0; i<s.geom.X*s.geom.Y; i++)
	{
		s32 x = (i%s.geom.X) * spacing.X;
		s32 y = (i/s.geom.X) * spacing.Y;
		v2s32 p(x,y);
		core::rect<s32> rect = imgrect + s.pos + p;
		InventoryItem *item = NULL;
		if(ilist)
			item = ilist->getItem(i);

		if(m_selected_item != NULL && m_selected_item->listname == s.listname
				&& m_selected_item->i == i)
		{
			/*s32 border = imgsize.X/12;
			driver->draw2DRectangle(video::SColor(255,192,192,192),
					core::rect<s32>(rect.UpperLeftCorner - v2s32(1,1)*border,
							rect.LowerRightCorner + v2s32(1,1)*border),
					NULL);
			driver->draw2DRectangle(video::SColor(255,0,0,0),
					core::rect<s32>(rect.UpperLeftCorner - v2s32(1,1)*((border+1)/2),
							rect.LowerRightCorner + v2s32(1,1)*((border+1)/2)),
					NULL);*/
			s32 border = 2;
			driver->draw2DRectangle(video::SColor(255,255,0,0),
					core::rect<s32>(rect.UpperLeftCorner - v2s32(1,1)*border,
							rect.LowerRightCorner + v2s32(1,1)*border),
					&AbsoluteClippingRect);
		}

		video::SColor bgcolor(255,128,128,128);
		driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);

		if(item)
		{
			drawInventoryItem(driver, font, item,
					rect, &AbsoluteClippingRect);
		}

	}
}

void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
{
	InventoryList *invlist = inv->getList(name);
	if(invlist == NULL){
		lua_pushnil(L);
		return;
	}
	std::vector<ItemStack> items;
	for(u32 i=0; i<invlist->getSize(); i++)
		items.push_back(invlist->getItem(i));
	push_items(L, items);
}

// get_stack(self, listname, i) -> itemstack
int InvRef::l_get_stack(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;
	InvRef *ref = checkobject(L, 1);
	const char *listname = luaL_checkstring(L, 2);
	int i = luaL_checknumber(L, 3) - 1;
	InventoryList *list = getlist(L, ref, listname);
	ItemStack item;
	if(list != NULL && i >= 0 && i < (int) list->getSize())
		item = list->getItem(i);
	LuaItemStack::create(L, item);
	return 1;
}

int ModApiClient::l_get_wielded_item(lua_State *L)
{
	Client *client = getClient(L);

	Inventory local_inventory(client->idef());
	client->getLocalInventory(local_inventory);

	InventoryList *mlist = local_inventory.getList("main");

	if (mlist && client->getPlayerItem() < mlist->getSize()) {
		LuaItemStack::create(L, mlist->getItem(client->getPlayerItem()));
	} else {
		LuaItemStack::create(L, ItemStack());
	}
	return 1;
}

bool PlayerSAO::setWieldedItem(const ItemStack &item)
{
	Inventory *inv = getInventory();
	if (inv) {
		InventoryList *mlist = inv->getList(getWieldList());
		if (mlist) {
			ItemStack olditem = mlist->getItem(getWieldIndex());
			if (olditem.name.empty()) {
				InventoryList *hlist = inv->getList("hand");
				if (hlist) {
					hlist->changeItem(0, item);
					return true;
				}
			}
			mlist->changeItem(getWieldIndex(), item);
			return true;
		}
	}
	return false;
}

// Crafting helper
bool getCraftingResult(Inventory *inv, ItemStack& result,
		std::vector<ItemStack> &output_replacements,
		bool decrementInput, IGameDef *gamedef)
{
	DSTACK(__FUNCTION_NAME);
	
	result.clear();

	// Get the InventoryList in which we will operate
	InventoryList *clist = inv->getList("craft");
	if(!clist)
		return false;

	// Mangle crafting grid to an another format
	CraftInput ci;
	ci.method = CRAFT_METHOD_NORMAL;
	ci.width = clist->getWidth() ? clist->getWidth() : 3;
	for(u16 i=0; i<clist->getSize(); i++)
		ci.items.push_back(clist->getItem(i));

	// Find out what is crafted and add it to result item slot
	CraftOutput co;
	bool found = gamedef->getCraftDefManager()->getCraftResult(
			ci, co, output_replacements, decrementInput, gamedef);
	if(found)
		result.deSerialize(co.item, gamedef->getItemDefManager());

	if(found && decrementInput)
	{
		// CraftInput has been changed, apply changes in clist
		for(u16 i=0; i<clist->getSize(); i++)
		{
			clist->changeItem(i, ci.items[i]);
		}
	}

	return found;
}

void GUIFormSpecMenu::drawSelectedItem()
{
	if(!m_selected_item)
		return;

	video::IVideoDriver* driver = Environment->getVideoDriver();

	// Get font
	gui::IGUIFont *font = NULL;
	gui::IGUISkin* skin = Environment->getSkin();
	if (skin)
		font = skin->getFont();
	
	Inventory *inv = m_invmgr->getInventory(m_selected_item->inventoryloc);
	assert(inv);
	InventoryList *list = inv->getList(m_selected_item->listname);
	assert(list);
	ItemStack stack = list->getItem(m_selected_item->i);
	stack.count = m_selected_amount;

	core::rect<s32> imgrect(0,0,imgsize.X,imgsize.Y);
	core::rect<s32> rect = imgrect + (m_pointer - imgrect.getCenter());
	drawItemStack(driver, font, stack, rect, NULL, m_gamedef);
}

bool RollbackAction::applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const
{
	try {
		switch (type) {
		case TYPE_NOTHING:
			return true;
		case TYPE_SET_NODE: {
			INodeDefManager *ndef = gamedef->ndef();
			// Make sure position is loaded from disk
			map->emergeBlock(getContainerPos(p, MAP_BLOCKSIZE), false);
			// Check current node
			MapNode current_node = map->getNodeNoEx(p);
			std::string current_name = ndef->get(current_node).name;
			// If current node not the new node, it's bad
			if (current_name != n_new.name) {
				return false;
			}
			// Create rollback node
			MapNode n(ndef, n_old.name, n_old.param1, n_old.param2);
			// Set rollback node
			try {
				if (!map->addNodeWithEvent(p, n)) {
					infostream << "RollbackAction::applyRevert(): "
						<< "AddNodeWithEvent failed at "
						<< PP(p) << " for " << n_old.name
						<< std::endl;
					return false;
				}
				if (n_old.meta.empty()) {
					map->removeNodeMetadata(p);
				} else {
					NodeMetadata *meta = map->getNodeMetadata(p);
					if (!meta) {
						meta = new NodeMetadata(gamedef);
						if (!map->setNodeMetadata(p, meta)) {
							delete meta;
							infostream << "RollbackAction::applyRevert(): "
								<< "setNodeMetadata failed at "
								<< PP(p) << " for " << n_old.name
								<< std::endl;
							return false;
						}
					}
					std::istringstream is(n_old.meta, std::ios::binary);
					meta->deSerialize(is);
				}
				// Inform other things that the meta data has changed
				v3s16 blockpos = getContainerPos(p, MAP_BLOCKSIZE);
				MapEditEvent event;
				event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
				event.p = blockpos;
				map->dispatchEvent(&event);
				// Set the block to be saved
				MapBlock *block = map->getBlockNoCreateNoEx(blockpos);
				if (block) {
					block->raiseModified(MOD_STATE_WRITE_NEEDED,
						MOD_REASON_REPORT_META_CHANGE);
				}
			} catch (InvalidPositionException &e) {
				infostream << "RollbackAction::applyRevert(): "
					<< "InvalidPositionException: " << e.what()
					<< std::endl;
				return false;
			}
			// Success
			return true; }
		case TYPE_MODIFY_INVENTORY_STACK: {
			InventoryLocation loc;
			loc.deSerialize(inventory_location);
			std::string real_name = gamedef->idef()->getAlias(inventory_stack.name);
			Inventory *inv = imgr->getInventory(loc);
			if (!inv) {
				infostream << "RollbackAction::applyRevert(): Could not get "
					"inventory at " << inventory_location << std::endl;
				return false;
			}
			InventoryList *list = inv->getList(inventory_list);
			if (!list) {
				infostream << "RollbackAction::applyRevert(): Could not get "
					"inventory list \"" << inventory_list << "\" in "
					<< inventory_location << std::endl;
				return false;
			}
			if (list->getSize() <= inventory_index) {
				infostream << "RollbackAction::applyRevert(): List index "
					<< inventory_index << " too large in "
					<< "inventory list \"" << inventory_list << "\" in "
					<< inventory_location << std::endl;
			}
			// If item was added, take away item, otherwise add removed item
			if (inventory_add) {
				// Silently ignore different current item
				if (list->getItem(inventory_index).name != real_name)
					return false;
				list->takeItem(inventory_index, inventory_stack.count);
			} else {
				list->addItem(inventory_index, inventory_stack);
			}
			// Inventory was modified; send to clients
			imgr->setInventoryModified(loc);
//.........这里部分代码省略.........

bool GUIInventoryMenu::OnEvent(const SEvent& event)
{
	if(event.EventType==EET_KEY_INPUT_EVENT)
	{
		KeyPress kp(event.KeyInput);
		if (event.KeyInput.PressedDown && (kp == EscapeKey ||
			kp == getKeySetting("keymap_inventory")))
		{
			quitMenu();
			return true;
		}
	}
	if(event.EventType==EET_MOUSE_INPUT_EVENT)
	{
		char amount = -1;

		if(event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
			amount = 0;
		else if(event.MouseInput.Event == EMIE_RMOUSE_PRESSED_DOWN)
			amount = 1;
		else if(event.MouseInput.Event == EMIE_MMOUSE_PRESSED_DOWN)
			amount = 10;

		if(amount >= 0)
		{
			v2s32 p(event.MouseInput.X, event.MouseInput.Y);
			//infostream<<"Mouse down at p=("<<p.X<<","<<p.Y<<")"<<std::endl;
			ItemSpec s = getItemAtPos(p);
			if(s.isValid())
			{
				infostream<<"Mouse down on "<<s.inventoryname
						<<"/"<<s.listname<<" "<<s.i<<std::endl;
				if(m_selected_item)
				{
					Inventory *inv_from = m_invmgr->getInventory(m_c,
							m_selected_item->inventoryname);
					Inventory *inv_to = m_invmgr->getInventory(m_c,
							s.inventoryname);
					assert(inv_from);
					assert(inv_to);
					InventoryList *list_from =
							inv_from->getList(m_selected_item->listname);
					InventoryList *list_to =
							inv_to->getList(s.listname);
					if(list_from == NULL)
						infostream<<"from list doesn't exist"<<std::endl;
					if(list_to == NULL)
						infostream<<"to list doesn't exist"<<std::endl;
					// Indicates whether source slot completely empties
					bool source_empties = false;
					if(list_from && list_to
							&& list_from->getItem(m_selected_item->i) != NULL)
					{
						infostream<<"Handing IACTION_MOVE to manager"<<std::endl;
						IMoveAction *a = new IMoveAction();
						a->count = amount;
						a->from_inv = m_selected_item->inventoryname;
						a->from_list = m_selected_item->listname;
						a->from_i = m_selected_item->i;
						a->to_inv = s.inventoryname;
						a->to_list = s.listname;
						a->to_i = s.i;
						//ispec.actions->push_back(a);
						m_invmgr->inventoryAction(a);

						if(list_from->getItem(m_selected_item->i)->getCount()==1)
							source_empties = true;
					}
					// Remove selection if target was left-clicked or source
					// slot was emptied
					if(amount == 0 || source_empties)
					{
						delete m_selected_item;
						m_selected_item = NULL;
					}
				}
				else
				{
					/*
						Select if non-NULL
					*/
					Inventory *inv = m_invmgr->getInventory(m_c,
							s.inventoryname);
					assert(inv);
					InventoryList *list = inv->getList(s.listname);
					if(list->getItem(s.i) != NULL)
					{
						m_selected_item = new ItemSpec(s);
					}
				}
			}
			else
			{
				if(m_selected_item)
				{
					delete m_selected_item;
					m_selected_item = NULL;
				}
			}
		}
//.........这里部分代码省略.........

//.........这里部分代码省略.........
			// Only digging of nodes
			if(pointed.type == POINTEDTHING_NODE)
			{
				bool pos_ok;
				MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
				if (!pos_ok) {
					infostream << "Server: Not finishing digging: Node not found."
					           << " Adding block to emerge queue."
					           << std::endl;
					m_emerge->enqueueBlockEmerge(peer_id, getNodeBlockPos(p_above), false);
				}

				/* Cheat prevention */
				bool is_valid_dig = true;
				if(!isSingleplayer() && !g_settings->getBool("disable_anticheat"))
				{
					v3s16 nocheat_p = playersao->getNoCheatDigPos();
					float nocheat_t = playersao->getNoCheatDigTime();
					playersao->noCheatDigEnd();
					// If player didn't start digging this, ignore dig
					if(nocheat_p != p_under){
						infostream<<"Server: NoCheat: "<<player->getName()
								<<" started digging "
								<<PP(nocheat_p)<<" and completed digging "
								<<PP(p_under)<<"; not digging."<<std::endl;
						is_valid_dig = false;
						// Call callbacks
						m_script->on_cheat(playersao, "finished_unknown_dig");
					}
					// Get player's wielded item
					ItemStack playeritem;
					InventoryList *mlist = playersao->getInventory()->getList("main");
					if(mlist != NULL)
						playeritem = mlist->getItem(playersao->getWieldIndex());
					ToolCapabilities playeritem_toolcap =
							playeritem.getToolCapabilities(m_itemdef);
					// Get diggability and expected digging time
					DigParams params = getDigParams(m_nodedef->get(n).groups,
							&playeritem_toolcap);
					// If can't dig, try hand
					if(!params.diggable){
						const ItemDefinition &hand = m_itemdef->get("");
						const ToolCapabilities *tp = hand.tool_capabilities;
						if(tp)
							params = getDigParams(m_nodedef->get(n).groups, tp);
					}
					// If can't dig, ignore dig
					if(!params.diggable){
						infostream<<"Server: NoCheat: "<<player->getName()
								<<" completed digging "<<PP(p_under)
								<<", which is not diggable with tool. not digging."
								<<std::endl;
						is_valid_dig = false;
						// Call callbacks
						m_script->on_cheat(playersao, "dug_unbreakable");
					}
					// Check digging time
					// If already invalidated, we don't have to
					if(!is_valid_dig){
						// Well not our problem then
					}
					// Clean and long dig
					else if(params.time > 2.0 && nocheat_t * 1.2 > params.time){
						// All is good, but grab time from pool; don't care if
						// it's actually available
						playersao->getDigPool().grab(params.time);

//.........这里部分代码省略.........
		2: Digging completed
	*/
	else if(action == 2) {
		// Only digging of nodes
		if(pointed.type == POINTEDTHING_NODE) {
			MapNode n = m_env->getMap().getNode(p_under);
			if (!n) {
				infostream << "Server: Not finishing digging: Node not found."
				           << " Adding block to emerge queue."
				           << std::endl;
				m_emerge->enqueueBlockEmerge(peer_id, getNodeBlockPos(p_above), false);
			}

			/* Cheat prevention */
			bool is_valid_dig = true;
			if (enable_anticheat && !isSingleplayer()) {
				v3s16 nocheat_p = playersao->getNoCheatDigPos();
				float nocheat_t = playersao->getNoCheatDigTime();
				playersao->noCheatDigEnd();
				// If player didn't start digging this, ignore dig
				if(nocheat_p != p_under) {
					infostream << "Server: NoCheat: " << player->getName()
					           << " started digging "
					           << PP(nocheat_p) << " and completed digging "
					           << PP(p_under) << "; not digging." << std::endl;
					is_valid_dig = false;
					// Call callbacks
					m_script->on_cheat(playersao, "finished_unknown_dig");
				}
				// Get player's wielded item
				ItemStack playeritem;
				InventoryList *mlist = playersao->getInventory()->getList("main");
				if(mlist != NULL)
					playeritem = mlist->getItem(playersao->getWieldIndex());
				ToolCapabilities playeritem_toolcap =
				    playeritem.getToolCapabilities(m_itemdef);
				// Get diggability and expected digging time
				DigParams params = getDigParams(m_nodedef->get(n).groups,
				                                &playeritem_toolcap);
				// If can't dig, try hand
				if(!params.diggable) {
					const ItemDefinition &hand = m_itemdef->get("");
					const ToolCapabilities *tp = hand.tool_capabilities;
					if(tp)
						params = getDigParams(m_nodedef->get(n).groups, tp);
				}
				// If can't dig, ignore dig
				if(!params.diggable) {
					infostream << "Server: NoCheat: " << player->getName()
					           << " completed digging " << PP(p_under)
					           << ", which is not diggable with tool. not digging."
					           << std::endl;
					is_valid_dig = false;
					// Call callbacks
					m_script->on_cheat(playersao, "dug_unbreakable");
				}
				// Check digging time
				// If already invalidated, we don't have to
				if(!is_valid_dig) {
					// Well not our problem then
				}
				// Clean and long dig
				else if(params.time > 2.0 && nocheat_t * 1.2 > params.time) {
					// All is good, but grab time from pool; don't care if
					// it's actually available
					playersao->getDigPool().grab(params.time);

bool GUIFormSpecMenu::OnEvent(const SEvent& event)
{
	if(event.EventType==EET_KEY_INPUT_EVENT)
	{
		KeyPress kp(event.KeyInput);
		if (event.KeyInput.PressedDown && (kp == EscapeKey ||
			kp == getKeySetting("keymap_inventory")))
		{
			quitMenu();
			return true;
		}
		if(event.KeyInput.Key==KEY_RETURN && event.KeyInput.PressedDown)
		{
			acceptInput();
			quitMenu();
			return true;
		}
	}
	if(event.EventType==EET_MOUSE_INPUT_EVENT
			&& event.MouseInput.Event == EMIE_MOUSE_MOVED)
	{
		// Mouse moved
		m_pointer = v2s32(event.MouseInput.X, event.MouseInput.Y);
	}
	if(event.EventType==EET_MOUSE_INPUT_EVENT
			&& event.MouseInput.Event != EMIE_MOUSE_MOVED)
	{
		// Mouse event other than movement

		v2s32 p(event.MouseInput.X, event.MouseInput.Y);
		m_pointer = p;

		// Get selected item and hovered/clicked item (s)

		updateSelectedItem();
		ItemSpec s = getItemAtPos(p);

		Inventory *inv_selected = NULL;
		Inventory *inv_s = NULL;

		if(m_selected_item)
		{
			inv_selected = m_invmgr->getInventory(m_selected_item->inventoryloc);
			assert(inv_selected);
			assert(inv_selected->getList(m_selected_item->listname) != NULL);
		}

		u32 s_count = 0;

		if(s.isValid())
		do{ // breakable
			inv_s = m_invmgr->getInventory(s.inventoryloc);

			if(!inv_s){
				errorstream<<"InventoryMenu: The selected inventory location "
						<<"\""<<s.inventoryloc.dump()<<"\" doesn't exist"
						<<std::endl;
				s.i = -1;  // make it invalid again
				break;
			}

			InventoryList *list = inv_s->getList(s.listname);
			if(list == NULL){
				verbosestream<<"InventoryMenu: The selected inventory list \""
						<<s.listname<<"\" does not exist"<<std::endl;
				s.i = -1;  // make it invalid again
				break;
			}

			if((u32)s.i >= list->getSize()){
				infostream<<"InventoryMenu: The selected inventory list \""
						<<s.listname<<"\" is too small (i="<<s.i<<", size="
						<<list->getSize()<<")"<<std::endl;
				s.i = -1;  // make it invalid again
				break;
			}

			s_count = list->getItem(s.i).count;
		}while(0);

		bool identical = (m_selected_item != NULL) && s.isValid() &&
			(inv_selected == inv_s) &&
			(m_selected_item->listname == s.listname) &&
			(m_selected_item->i == s.i);

		// buttons: 0 = left, 1 = right, 2 = middle
		// up/down: 0 = down (press), 1 = up (release), 2 = unknown event
		int button = 0;
		int updown = 2;
		if(event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
			{ button = 0; updown = 0; }
		else if(event.MouseInput.Event == EMIE_RMOUSE_PRESSED_DOWN)
			{ button = 1; updown = 0; }
		else if(event.MouseInput.Event == EMIE_MMOUSE_PRESSED_DOWN)
			{ button = 2; updown = 0; }
		else if(event.MouseInput.Event == EMIE_LMOUSE_LEFT_UP)
			{ button = 0; updown = 1; }
		else if(event.MouseInput.Event == EMIE_RMOUSE_LEFT_UP)
			{ button = 1; updown = 1; }
		else if(event.MouseInput.Event == EMIE_MMOUSE_LEFT_UP)
//.........这里部分代码省略.........

void GUIFormSpecMenu::updateSelectedItem()
{
	// WARNING: BLACK MAGIC
	// See if there is a stack suited for our current guess.
	// If such stack does not exist, clear the guess.
	if(m_selected_content_guess.name != "")
	{
		bool found = false;
		for(u32 i=0; i<m_inventorylists.size() && !found; i++){
			const ListDrawSpec &s = m_inventorylists[i];
			Inventory *inv = m_invmgr->getInventory(s.inventoryloc);
			if(!inv)
				continue;
			InventoryList *list = inv->getList(s.listname);
			if(!list)
				continue;
			for(s32 i=0; i<s.geom.X*s.geom.Y && !found; i++){
				u32 item_i = i + s.start_item_i;
				if(item_i >= list->getSize())
					continue;
				ItemStack stack = list->getItem(item_i);
				if(stack.name == m_selected_content_guess.name &&
						stack.count == m_selected_content_guess.count){
					found = true;
					if(m_selected_item){
						// If guessed stack is already selected, all is fine
						if(m_selected_item->inventoryloc == s.inventoryloc &&
								m_selected_item->listname == s.listname &&
								m_selected_item->i == (s32)item_i &&
								m_selected_amount == stack.count){
							break;
						}
						delete m_selected_item;
						m_selected_item = NULL;
					}
					infostream<<"Client: Changing selected content guess to "
							<<s.inventoryloc.dump()<<" "<<s.listname
							<<" "<<item_i<<std::endl;
					m_selected_item = new ItemSpec(s.inventoryloc, s.listname, item_i);
					m_selected_amount = stack.count;
					break;
				}
			}
		}
		if(!found){
			infostream<<"Client: Discarding selected content guess: "
					<<m_selected_content_guess.getItemString()<<std::endl;
			m_selected_content_guess.name = "";
		}
	}
	// If the selected stack has become empty for some reason, deselect it.
	// If the selected stack has become smaller, adjust m_selected_amount.
	if(m_selected_item)
	{
		bool selection_valid = false;
		if(m_selected_item->isValid())
		{
			Inventory *inv = m_invmgr->getInventory(m_selected_item->inventoryloc);
			if(inv)
			{
				InventoryList *list = inv->getList(m_selected_item->listname);
				if(list && (u32) m_selected_item->i < list->getSize())
				{
					ItemStack stack = list->getItem(m_selected_item->i);
					if(m_selected_amount > stack.count)
						m_selected_amount = stack.count;
					if(!stack.empty())
						selection_valid = true;
				}
			}
		}
		if(!selection_valid)
		{
			delete m_selected_item;
			m_selected_item = NULL;
			m_selected_amount = 0;
			m_selected_dragging = false;
		}
	}

	// If craftresult is nonempty and nothing else is selected, select it now.
	if(!m_selected_item)
	{
		for(u32 i=0; i<m_inventorylists.size(); i++)
		{
			const ListDrawSpec &s = m_inventorylists[i];
			if(s.listname == "craftpreview")
			{
				Inventory *inv = m_invmgr->getInventory(s.inventoryloc);
				InventoryList *list = inv->getList("craftresult");
				if(list && list->getSize() >= 1 && !list->getItem(0).empty())
				{
					m_selected_item = new ItemSpec;
					m_selected_item->inventoryloc = s.inventoryloc;
					m_selected_item->listname = "craftresult";
					m_selected_item->i = 0;
					m_selected_amount = 0;
					m_selected_dragging = false;
					break;
				}
//.........这里部分代码省略.........

void GUIFormSpecMenu::drawList(const ListDrawSpec &s, int phase)
{
	video::IVideoDriver* driver = Environment->getVideoDriver();

	// Get font
	gui::IGUIFont *font = NULL;
	gui::IGUISkin* skin = Environment->getSkin();
	if (skin)
		font = skin->getFont();
	
	Inventory *inv = m_invmgr->getInventory(s.inventoryloc);
	if(!inv){
		infostream<<"GUIFormSpecMenu::drawList(): WARNING: "
				<<"The inventory location "
				<<"\""<<s.inventoryloc.dump()<<"\" doesn't exist"
				<<std::endl;
		return;
	}
	InventoryList *ilist = inv->getList(s.listname);
	if(!ilist){
		infostream<<"GUIFormSpecMenu::drawList(): WARNING: "
				<<"The inventory list \""<<s.listname<<"\" @ \""
				<<s.inventoryloc.dump()<<"\" doesn't exist"
				<<std::endl;
		return;
	}
	
	core::rect<s32> imgrect(0,0,imgsize.X,imgsize.Y);
	
	for(s32 i=0; i<s.geom.X*s.geom.Y; i++)
	{
		u32 item_i = i + s.start_item_i;
		if(item_i >= ilist->getSize())
			break;
		s32 x = (i%s.geom.X) * spacing.X;
		s32 y = (i/s.geom.X) * spacing.Y;
		v2s32 p(x,y);
		core::rect<s32> rect = imgrect + s.pos + p;
		ItemStack item;
		if(ilist)
			item = ilist->getItem(item_i);

		bool selected = m_selected_item
			&& m_invmgr->getInventory(m_selected_item->inventoryloc) == inv
			&& m_selected_item->listname == s.listname
			&& m_selected_item->i == i;
		bool hovering = rect.isPointInside(m_pointer);

		if(phase == 0)
		{
			if(hovering && m_selected_item)
			{
				video::SColor bgcolor(255,192,192,192);
				driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);
			}
			else
			{
				video::SColor bgcolor(255,128,128,128);
				driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);
			}
		}

		if(phase == 1)
		{
			// Draw item stack
			if(selected)
			{
				item.takeItem(m_selected_amount);
			}
			if(!item.empty())
			{
				drawItemStack(driver, font, item,
						rect, &AbsoluteClippingRect, m_gamedef);
			}

			// Draw tooltip
			std::string tooltip_text = "";
			if(hovering && !m_selected_item)
				tooltip_text = item.getDefinition(m_gamedef->idef()).description;
			if(tooltip_text != "")
			{
				m_tooltip_element->setVisible(true);
				this->bringToFront(m_tooltip_element);
				m_tooltip_element->setText(narrow_to_wide(tooltip_text).c_str());
				s32 tooltip_x = m_pointer.X + 15;
				s32 tooltip_y = m_pointer.Y + 15;
				s32 tooltip_width = m_tooltip_element->getTextWidth() + 15;
				s32 tooltip_height = m_tooltip_element->getTextHeight() + 5;
				m_tooltip_element->setRelativePosition(core::rect<s32>(
						core::position2d<s32>(tooltip_x, tooltip_y),
						core::dimension2d<s32>(tooltip_width, tooltip_height)));
			}
		}
	}
}