/** 
 * @file lltooldraganddrop.cpp
 * @brief LLToolDragAndDrop class implementation
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"
#include "lltooldraganddrop.h"

// library headers
#include "llnotificationsutil.h"
// project headers
#include "llagent.h"
#include "llagentcamera.h"
#include "llagentwearables.h"
#include "llappearancemgr.h"
#include "llavatarnamecache.h"
#include "lldictionary.h"
#include "llfloaterreg.h"
#include "llfloatertools.h"
#include "llgesturemgr.h"
#include "llgiveinventory.h"
#include "llgltfmateriallist.h"
#include "llhudmanager.h"
#include "llhudeffecttrail.h"
#include "llimview.h"
#include "llinventorybridge.h"
#include "llinventorydefines.h"
#include "llinventoryfunctions.h"
#include "llinventorymodelbackgroundfetch.h"
#include "llpreviewnotecard.h"
#include "llrootview.h"
#include "llselectmgr.h"
#include "lltoolbarview.h"
#include "lltoolmgr.h"
#include "lltooltip.h"
#include "lltrans.h"
#include "llviewerobjectlist.h"
#include "llviewerregion.h"
#include "llviewerstats.h"
#include "llviewerwindow.h"
#include "llvoavatarself.h"
#include "llworld.h"
#include "llpanelface.h"
#include "lluiusage.h"

// syntactic sugar
#define callMemberFunction(object,ptrToMember)  ((object).*(ptrToMember))

class LLNoPreferredType : public LLInventoryCollectFunctor
{
public:
	LLNoPreferredType() {}
	virtual ~LLNoPreferredType() {}
	virtual bool operator()(LLInventoryCategory* cat,
							LLInventoryItem* item)
	{
		if (cat && (cat->getPreferredType() == LLFolderType::FT_NONE))
		{
			return true;
		}
		return false;
	}
};

class LLNoPreferredTypeOrItem : public LLInventoryCollectFunctor
{
public:
	LLNoPreferredTypeOrItem() {}
	virtual ~LLNoPreferredTypeOrItem() {}
	virtual bool operator()(LLInventoryCategory* cat,
							LLInventoryItem* item)
	{
		if (item) return true;
		if (cat && (cat->getPreferredType() == LLFolderType::FT_NONE))
		{
			return true;
		}
		return false;
	}
};

class LLDroppableItem : public LLInventoryCollectFunctor
{
public:
	LLDroppableItem(bool is_transfer) :
		mCountLosing(0), mIsTransfer(is_transfer) {}
	virtual ~LLDroppableItem() {}
	virtual bool operator()(LLInventoryCategory* cat,
							LLInventoryItem* item);
	S32 countNoCopy() const { return mCountLosing; }

protected:
	S32 mCountLosing;
	bool mIsTransfer;
};

bool LLDroppableItem::operator()(LLInventoryCategory* cat,
				 LLInventoryItem* item)
{
	bool allowed = false;
	if (item)
	{
		allowed = itemTransferCommonlyAllowed(item);

		if (allowed
		   && mIsTransfer
		   && !item->getPermissions().allowOperationBy(PERM_TRANSFER,
							       gAgent.getID()))
		{
			allowed = false;
		}
		if (allowed && !item->getPermissions().allowCopyBy(gAgent.getID()))
		{
			++mCountLosing;
		}
	}
	return allowed;
}

class LLDropCopyableItems : public LLInventoryCollectFunctor
{
public:
	LLDropCopyableItems() {}
	virtual ~LLDropCopyableItems() {}
	virtual bool operator()(LLInventoryCategory* cat, LLInventoryItem* item);
};


bool LLDropCopyableItems::operator()(
	LLInventoryCategory* cat,
	LLInventoryItem* item)
{
	bool allowed = false;
	if (item)
	{
		allowed = itemTransferCommonlyAllowed(item);
		if (allowed &&
		   !item->getPermissions().allowCopyBy(gAgent.getID()))
		{
			// whoops, can't copy it - don't allow it.
			allowed = false;
		}
	}
	return allowed;
}

// Starts a fetch on folders and items.  This is really not used 
// as an observer in the traditional sense; we're just using it to
// request a fetch and we don't care about when/if the response arrives.
class LLCategoryFireAndForget : public LLInventoryFetchComboObserver
{
public:
	LLCategoryFireAndForget(const uuid_vec_t& folder_ids,
							const uuid_vec_t& item_ids) :
		LLInventoryFetchComboObserver(folder_ids, item_ids)
	{}
	~LLCategoryFireAndForget() {}
	virtual void done()
	{
		/* no-op: it's fire n forget right? */
		LL_DEBUGS() << "LLCategoryFireAndForget::done()" << LL_ENDL;
	}
};

class LLCategoryDropObserver : public LLInventoryFetchItemsObserver
{
public:
	LLCategoryDropObserver(
		const uuid_vec_t& ids,
		const LLUUID& obj_id, LLToolDragAndDrop::ESource src) :
		LLInventoryFetchItemsObserver(ids),
		mObjectID(obj_id),
		mSource(src)
	{}
	~LLCategoryDropObserver() {}
	virtual void done();

protected:
	LLUUID mObjectID;
	LLToolDragAndDrop::ESource mSource;
};

void LLCategoryDropObserver::done()
{
	gInventory.removeObserver(this);
	LLViewerObject* dst_obj = gObjectList.findObject(mObjectID);
	if (dst_obj)
	{
		// *FIX: coalesce these...
 		LLInventoryItem* item = NULL;
  		uuid_vec_t::iterator it = mComplete.begin();
  		uuid_vec_t::iterator end = mComplete.end();
  		for(; it < end; ++it)
  		{
 			item = gInventory.getItem(*it);
 			if (item)
 			{
 				LLToolDragAndDrop::dropInventory(
 					dst_obj,
 					item,
 					mSource,
 					LLUUID::null);
 			}
  		}
	}
	delete this;
}

S32 LLToolDragAndDrop::sOperationId = 0;

LLToolDragAndDrop::DragAndDropEntry::DragAndDropEntry(dragOrDrop3dImpl f_none,
													  dragOrDrop3dImpl f_self,
													  dragOrDrop3dImpl f_avatar,
													  dragOrDrop3dImpl f_object,
													  dragOrDrop3dImpl f_land) :
	LLDictionaryEntry("")
{
	mFunctions[DT_NONE] = f_none;
	mFunctions[DT_SELF] = f_self;
	mFunctions[DT_AVATAR] = f_avatar;
	mFunctions[DT_OBJECT] = f_object;
	mFunctions[DT_LAND] = f_land;
}

LLToolDragAndDrop::dragOrDrop3dImpl LLToolDragAndDrop::LLDragAndDropDictionary::get(EDragAndDropType dad_type, LLToolDragAndDrop::EDropTarget drop_target)
{
	const DragAndDropEntry *entry = lookup(dad_type);
	if (entry)
	{
		return (entry->mFunctions[(U8)drop_target]);
	}
	return &LLToolDragAndDrop::dad3dNULL;
}

LLToolDragAndDrop::LLDragAndDropDictionary::LLDragAndDropDictionary()
{
 	//       										 DT_NONE                         DT_SELF                                        DT_AVATAR                   					DT_OBJECT                       					DT_LAND		
	//      										|-------------------------------|----------------------------------------------|-----------------------------------------------|---------------------------------------------------|--------------------------------|
	addEntry(DAD_NONE, 			new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dNULL,						&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_TEXTURE, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dGiveInventory,			&LLToolDragAndDrop::dad3dTextureObject,				&LLToolDragAndDrop::dad3dNULL));
    addEntry(DAD_MATERIAL,      new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dNULL,                  &LLToolDragAndDrop::dad3dGiveInventory,         &LLToolDragAndDrop::dad3dMaterialObject,            &LLToolDragAndDrop::dad3dNULL));
    addEntry(DAD_SOUND, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dGiveInventory,			&LLToolDragAndDrop::dad3dUpdateInventory,			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_CALLINGCARD, 	new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dGiveInventory, 		&LLToolDragAndDrop::dad3dUpdateInventory, 			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_LANDMARK, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dNULL, 					&LLToolDragAndDrop::dad3dGiveInventory, 		&LLToolDragAndDrop::dad3dUpdateInventory, 			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_SCRIPT, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dNULL, 					&LLToolDragAndDrop::dad3dGiveInventory, 		&LLToolDragAndDrop::dad3dRezScript, 				&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_CLOTHING, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dWearItem, 				&LLToolDragAndDrop::dad3dGiveInventory, 		&LLToolDragAndDrop::dad3dUpdateInventory, 			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_OBJECT, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dRezAttachmentFromInv,	&LLToolDragAndDrop::dad3dGiveInventoryObject,	&LLToolDragAndDrop::dad3dRezObjectOnObject, 		&LLToolDragAndDrop::dad3dRezObjectOnLand));
	addEntry(DAD_NOTECARD, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dNULL, 					&LLToolDragAndDrop::dad3dGiveInventory, 		&LLToolDragAndDrop::dad3dUpdateInventory, 			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_CATEGORY,		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dWearCategory,			&LLToolDragAndDrop::dad3dGiveInventoryCategory,	&LLToolDragAndDrop::dad3dRezCategoryOnObject,		&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_ROOT_CATEGORY, new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dNULL,						&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_BODYPART, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dWearItem,				&LLToolDragAndDrop::dad3dGiveInventory,			&LLToolDragAndDrop::dad3dUpdateInventory,			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_ANIMATION, 	new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dGiveInventory,			&LLToolDragAndDrop::dad3dUpdateInventory,			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_GESTURE, 		new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dActivateGesture,		&LLToolDragAndDrop::dad3dGiveInventory,			&LLToolDragAndDrop::dad3dUpdateInventory,			&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_LINK, 			new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dNULL,						&LLToolDragAndDrop::dad3dNULL));
	addEntry(DAD_MESH, 			new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL,	&LLToolDragAndDrop::dad3dNULL,					&LLToolDragAndDrop::dad3dGiveInventory,			&LLToolDragAndDrop::dad3dMeshObject,				&LLToolDragAndDrop::dad3dNULL));
    addEntry(DAD_SETTINGS,      new DragAndDropEntry(&LLToolDragAndDrop::dad3dNULL, &LLToolDragAndDrop::dad3dNULL,                  &LLToolDragAndDrop::dad3dGiveInventory,         &LLToolDragAndDrop::dad3dUpdateInventory,           &LLToolDragAndDrop::dad3dNULL));
    
    // TODO: animation on self could play it?  edit it?
	// TODO: gesture on self could play it?  edit it?
};

LLToolDragAndDrop::LLToolDragAndDrop()
:	LLTool(std::string("draganddrop"), NULL),
	mCargoCount(0),
	mDragStartX(0),
	mDragStartY(0),
	mSource(SOURCE_AGENT),
	mCursor(UI_CURSOR_NO),
	mLastAccept(ACCEPT_NO),
	mDrop(false),
	mCurItemIndex(0)
{

}

void LLToolDragAndDrop::setDragStart(S32 x, S32 y)
{
	mDragStartX = x;
	mDragStartY = y;
}

bool LLToolDragAndDrop::isOverThreshold(S32 x,S32 y)
{
	static LLCachedControl<S32> drag_and_drop_threshold(gSavedSettings,"DragAndDropDistanceThreshold", 3);
	
	S32 mouse_delta_x = x - mDragStartX;
	S32 mouse_delta_y = y - mDragStartY;
	
	return (mouse_delta_x * mouse_delta_x) + (mouse_delta_y * mouse_delta_y) > drag_and_drop_threshold * drag_and_drop_threshold;
}

void LLToolDragAndDrop::beginDrag(EDragAndDropType type,
								  const LLUUID& cargo_id,
								  ESource source,
								  const LLUUID& source_id,
								  const LLUUID& object_id)
{
	if (type == DAD_NONE)
	{
		LL_WARNS() << "Attempted to start drag without a cargo type" << LL_ENDL;
		return;
	}

    if (type != DAD_CATEGORY)
    {
        LLViewerInventoryItem* item = gInventory.getItem(cargo_id);
        if (item && !item->isFinished())
        {
            LLInventoryModelBackgroundFetch::instance().start(item->getUUID(), false);
        }
    }

	mCargoTypes.clear();
	mCargoTypes.push_back(type);
	mCargoIDs.clear();
	mCargoIDs.push_back(cargo_id);
	mSource = source;
	mSourceID = source_id;
	mObjectID = object_id;

	setMouseCapture( true );
	LLToolMgr::getInstance()->setTransientTool( this );
	mCursor = UI_CURSOR_NO;
	if ((mCargoTypes[0] == DAD_CATEGORY)
	   && ((mSource == SOURCE_AGENT) || (mSource == SOURCE_LIBRARY)))
	{
		LLInventoryCategory* cat = gInventory.getCategory(cargo_id);
		// go ahead and fire & forget the descendents if we are not
		// dragging a protected folder.
		if (cat)
		{
			LLViewerInventoryCategory::cat_array_t cats;
			LLViewerInventoryItem::item_array_t items;
			LLNoPreferredTypeOrItem is_not_preferred;
			uuid_vec_t folder_ids;
			uuid_vec_t item_ids;
			if (is_not_preferred(cat, NULL))
			{
				folder_ids.push_back(cargo_id);
			}
			gInventory.collectDescendentsIf(
				cargo_id,
				cats,
				items,
				LLInventoryModel::EXCLUDE_TRASH,
				is_not_preferred);
			S32 count = cats.size();
			S32 i;
			for(i = 0; i < count; ++i)
			{
				folder_ids.push_back(cats.at(i)->getUUID());
			}
			count = items.size();
			for(i = 0; i < count; ++i)
			{
				item_ids.push_back(items.at(i)->getUUID());
			}
			if (!folder_ids.empty() || !item_ids.empty())
			{
				LLCategoryFireAndForget *fetcher = new LLCategoryFireAndForget(folder_ids, item_ids);
				fetcher->startFetch();
				delete fetcher;
			}
		}
	}
}

void LLToolDragAndDrop::beginMultiDrag(
	const std::vector<EDragAndDropType> types,
	const uuid_vec_t& cargo_ids,
	ESource source,
	const LLUUID& source_id)
{
	// assert on public api is evil
	//llassert( type != DAD_NONE );

	std::vector<EDragAndDropType>::const_iterator types_it;
	for (types_it = types.begin(); types_it != types.end(); ++types_it)
	{
		if (DAD_NONE == *types_it)
		{
			LL_WARNS() << "Attempted to start drag without a cargo type" << LL_ENDL;
			return;
		}
	}
	mCargoTypes = types;
	mCargoIDs = cargo_ids;
	mSource = source;
	mSourceID = source_id;

	setMouseCapture( true );
	LLToolMgr::getInstance()->setTransientTool( this );
	mCursor = UI_CURSOR_NO;
	if ((mSource == SOURCE_AGENT) || (mSource == SOURCE_LIBRARY))
	{
		// find categories (i.e. inventory folders) in the cargo.
		LLInventoryCategory* cat = NULL;
		S32 count = llmin(cargo_ids.size(), types.size());
		std::set<LLUUID> cat_ids;
		for(S32 i = 0; i < count; ++i)
		{
			cat = gInventory.getCategory(cargo_ids[i]);
			if (cat)
			{
				LLViewerInventoryCategory::cat_array_t cats;
				LLViewerInventoryItem::item_array_t items;
				LLNoPreferredType is_not_preferred;
				if (is_not_preferred(cat, NULL))
				{
					cat_ids.insert(cat->getUUID());
				}
				gInventory.collectDescendentsIf(
					cat->getUUID(),
					cats,
					items,
					LLInventoryModel::EXCLUDE_TRASH,
					is_not_preferred);
				S32 cat_count = cats.size();
				for(S32 i = 0; i < cat_count; ++i)
				{
					cat_ids.insert(cat->getUUID());
				}
			}
		}
		if (!cat_ids.empty())
		{
			uuid_vec_t folder_ids;
			uuid_vec_t item_ids;
			std::back_insert_iterator<uuid_vec_t> copier(folder_ids);
			std::copy(cat_ids.begin(), cat_ids.end(), copier);
			LLCategoryFireAndForget fetcher(folder_ids, item_ids);
		}
	}
}

void LLToolDragAndDrop::endDrag()
{
	mEndDragSignal();
	LLSelectMgr::getInstance()->unhighlightAll();
	setMouseCapture(false);
}

void LLToolDragAndDrop::onMouseCaptureLost()
{
	// Called whenever the drag ends or if mouse capture is simply lost
	LLToolMgr::getInstance()->clearTransientTool();
	mCargoTypes.clear();
	mCargoIDs.clear();
	mSource = SOURCE_AGENT;
	mSourceID.setNull();
	mObjectID.setNull();
	mCustomMsg.clear();
}

bool LLToolDragAndDrop::handleMouseUp( S32 x, S32 y, MASK mask )
{
	if (hasMouseCapture())
	{
		EAcceptance acceptance = ACCEPT_NO;
		dragOrDrop( x, y, mask, true, &acceptance );
		endDrag();
	}
	return true;
}

ECursorType LLToolDragAndDrop::acceptanceToCursor( EAcceptance acceptance )
{
	switch (acceptance)
	{
	case ACCEPT_YES_MULTI:
		if (mCargoIDs.size() > 1)
		{
			mCursor = UI_CURSOR_ARROWDRAGMULTI;
		}
		else
		{
			mCursor = UI_CURSOR_ARROWDRAG;
		}
		break;
	case ACCEPT_YES_SINGLE:
		if (mCargoIDs.size() > 1)
		{
			mToolTipMsg = LLTrans::getString("TooltipMustSingleDrop");
			mCursor = UI_CURSOR_NO;
		}
		else
		{
			mCursor = UI_CURSOR_ARROWDRAG;
		}
		break;

	case ACCEPT_NO_LOCKED:
		mCursor = UI_CURSOR_NOLOCKED;
		break;

	case ACCEPT_NO_CUSTOM:
		mToolTipMsg = mCustomMsg;
		mCursor = UI_CURSOR_NO;
		break;


	case ACCEPT_NO:
		mCursor = UI_CURSOR_NO;
		break;

	case ACCEPT_YES_COPY_MULTI:
		if (mCargoIDs.size() > 1)
		{
			mCursor = UI_CURSOR_ARROWCOPYMULTI;
		}
		else
		{
			mCursor = UI_CURSOR_ARROWCOPY;
		}
		break;
	case ACCEPT_YES_COPY_SINGLE:
		if (mCargoIDs.size() > 1)
		{
			mToolTipMsg = LLTrans::getString("TooltipMustSingleDrop");
			mCursor = UI_CURSOR_NO;
		}
		else
		{
			mCursor = UI_CURSOR_ARROWCOPY;
		}
		break;
	case ACCEPT_POSTPONED:
		break;
	default:
		llassert( false );
	}

	return mCursor;
}

bool LLToolDragAndDrop::handleHover( S32 x, S32 y, MASK mask )
{
	EAcceptance acceptance = ACCEPT_NO;
	dragOrDrop( x, y, mask, false, &acceptance );

	ECursorType cursor = acceptanceToCursor(acceptance);
	gViewerWindow->getWindow()->setCursor( cursor );

	LL_DEBUGS("UserInput") << "hover handled by LLToolDragAndDrop" << LL_ENDL;
	return true;
}

bool LLToolDragAndDrop::handleKey(KEY key, MASK mask)
{
	if (key == KEY_ESCAPE)
	{
		// cancel drag and drop operation
		endDrag();
		return true;
	}

	return false;
}

bool LLToolDragAndDrop::handleToolTip(S32 x, S32 y, MASK mask)
{
	if (!mToolTipMsg.empty())
	{
		LLToolTipMgr::instance().unblockToolTips();
		LLToolTipMgr::instance().show(LLToolTip::Params()
			.message(mToolTipMsg)
			.delay_time(gSavedSettings.getF32( "DragAndDropToolTipDelay" )));
		return true;
	}
	return false;
}

void LLToolDragAndDrop::handleDeselect()
{
	mToolTipMsg.clear();
	mCustomMsg.clear();

	LLToolTipMgr::instance().blockToolTips();
}

// protected
void LLToolDragAndDrop::dragOrDrop( S32 x, S32 y, MASK mask, bool drop, 
								   EAcceptance* acceptance)
{
	*acceptance = ACCEPT_YES_MULTI;

	bool handled = false;

	LLView* top_view = gFocusMgr.getTopCtrl();
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;

	mToolTipMsg.clear();

	// Increment the operation id for every drop
	if (drop)
	{
		sOperationId++;
	}

	// For people drag and drop we don't need an actual inventory object,
	// instead we need the current cargo id, which should be a person id.
	bool is_uuid_dragged = (mSource == SOURCE_PEOPLE);

	if (top_view)
	{
		handled = true;

		for (mCurItemIndex = 0; mCurItemIndex < (S32)mCargoIDs.size(); mCurItemIndex++)
		{
			S32 local_x, local_y;
			top_view->screenPointToLocal( x, y, &local_x, &local_y );
			EAcceptance item_acceptance = ACCEPT_NO;

			LLInventoryObject* cargo = locateInventory(item, cat);
			if (cargo)
			{
				handled = handled && top_view->handleDragAndDrop(local_x, local_y, mask, false,
													mCargoTypes[mCurItemIndex],
													(void*)cargo,
													&item_acceptance,
													mToolTipMsg);
			}
			else if (is_uuid_dragged)
			{
				handled = handled && top_view->handleDragAndDrop(local_x, local_y, mask, false,
													mCargoTypes[mCurItemIndex],
													(void*)&mCargoIDs[mCurItemIndex],
													&item_acceptance,
													mToolTipMsg);
			}
			if (handled)
			{
				// use sort order to determine priority of acceptance
				*acceptance = (EAcceptance)llmin((U32)item_acceptance, (U32)*acceptance);
			}
		}

		// all objects passed, go ahead and perform drop if necessary
		if (handled && drop && (U32)*acceptance >= ACCEPT_YES_COPY_SINGLE)
		{
			if ((U32)*acceptance < ACCEPT_YES_COPY_MULTI &&
			    mCargoIDs.size() > 1)
			{
				// tried to give multi-cargo to a single-acceptor - refuse and return.
				*acceptance = ACCEPT_NO;
				return;
			}

			for (mCurItemIndex = 0; mCurItemIndex < (S32)mCargoIDs.size(); mCurItemIndex++)
			{
				S32 local_x, local_y;
				EAcceptance item_acceptance;
				top_view->screenPointToLocal( x, y, &local_x, &local_y );

				LLInventoryObject* cargo = locateInventory(item, cat);
				if (cargo)
				{
					handled = handled && top_view->handleDragAndDrop(local_x, local_y, mask, true,
														mCargoTypes[mCurItemIndex],
														(void*)cargo,
														&item_acceptance,
														mToolTipMsg);
				}
				else if (is_uuid_dragged)
				{
					handled = handled && top_view->handleDragAndDrop(local_x, local_y, mask, false,
														mCargoTypes[mCurItemIndex],
														(void*)&mCargoIDs[mCurItemIndex],
														&item_acceptance,
														mToolTipMsg);
				}
			}
		}
		if (handled)
		{
			mLastAccept = (EAcceptance)*acceptance;
		}
	}

	if (!handled)
	{
		handled = true;

		LLRootView* root_view = gViewerWindow->getRootView();

		for (mCurItemIndex = 0; mCurItemIndex < (S32)mCargoIDs.size(); mCurItemIndex++)
		{
			EAcceptance item_acceptance = ACCEPT_NO;

			LLInventoryObject* cargo = locateInventory(item, cat);

			// fix for EXT-3191
			if (cargo)
			{
				handled = handled && root_view->handleDragAndDrop(x, y, mask, false,
													mCargoTypes[mCurItemIndex],
													(void*)cargo,
													&item_acceptance,
													mToolTipMsg);
			}
			else if (is_uuid_dragged)
			{
				handled = handled && root_view->handleDragAndDrop(x, y, mask, false,
													mCargoTypes[mCurItemIndex],
													(void*)&mCargoIDs[mCurItemIndex],
													&item_acceptance,
													mToolTipMsg);
			}
			if (handled)
			{
				// use sort order to determine priority of acceptance
				*acceptance = (EAcceptance)llmin((U32)item_acceptance, (U32)*acceptance);
			}
		}
		// all objects passed, go ahead and perform drop if necessary
		if (handled && drop && (U32)*acceptance > ACCEPT_NO_LOCKED)
		{	
			if ((U32)*acceptance < ACCEPT_YES_COPY_MULTI &&
			    mCargoIDs.size() > 1)
			{
				// tried to give multi-cargo to a single-acceptor - refuse and return.
				*acceptance = ACCEPT_NO;
				return;
			}

			for (mCurItemIndex = 0; mCurItemIndex < (S32)mCargoIDs.size(); mCurItemIndex++)
			{
				EAcceptance item_acceptance;

				LLInventoryObject* cargo = locateInventory(item, cat);
				if (cargo)
				{
					handled = handled && root_view->handleDragAndDrop(x, y, mask, true,
											  mCargoTypes[mCurItemIndex],
											  (void*)cargo,
											  &item_acceptance,
											  mToolTipMsg);
				}
				else if (is_uuid_dragged)
				{
					handled = handled && root_view->handleDragAndDrop(x, y, mask, true,
											  mCargoTypes[mCurItemIndex],
											  (void*)&mCargoIDs[mCurItemIndex],
											  &item_acceptance,
											  mToolTipMsg);
				}
			}
		}

		if (handled)
		{
			mLastAccept = (EAcceptance)*acceptance;
		}
	}

	if (!handled)
	{
		// Disallow drag and drop to 3D from the marketplace
        const LLUUID marketplacelistings_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_MARKETPLACE_LISTINGS);
		if (marketplacelistings_id.notNull())
		{
			for (S32 item_index = 0; item_index < (S32)mCargoIDs.size(); item_index++)
			{
				if (gInventory.isObjectDescendentOf(mCargoIDs[item_index], marketplacelistings_id))
				{
					*acceptance = ACCEPT_NO;
					mToolTipMsg = LLTrans::getString("TooltipOutboxDragToWorld");
					return;
				}
			}
		}
		
		dragOrDrop3D( x, y, mask, drop, acceptance );
	}
}

void LLToolDragAndDrop::dragOrDrop3D( S32 x, S32 y, MASK mask, bool drop, EAcceptance* acceptance )
{
	mDrop = drop;
	if (mDrop)
	{
		// don't allow drag and drop onto rigged or transparent objects
		pick(gViewerWindow->pickImmediate(x, y, false, false));
	}
	else
	{
		// don't allow drag and drop onto transparent objects
		gViewerWindow->pickAsync(x, y, mask, pickCallback, false, false);
	}

	*acceptance = mLastAccept;
}

void LLToolDragAndDrop::pickCallback(const LLPickInfo& pick_info)
{
	if (getInstance() != NULL)
	{
		getInstance()->pick(pick_info);
	}
}

void LLToolDragAndDrop::pick(const LLPickInfo& pick_info)
{
	EDropTarget target = DT_NONE;
	S32	hit_face = -1;

	LLViewerObject* hit_obj = pick_info.getObject();
	LLSelectMgr::getInstance()->unhighlightAll();
	bool highlight_object = false;
	// Treat attachments as part of the avatar they are attached to.
	if (hit_obj != NULL)
	{
		// don't allow drag and drop on grass, trees, etc.
		if (pick_info.mPickType == LLPickInfo::PICK_FLORA)
		{
			mCursor = UI_CURSOR_NO;
			gViewerWindow->getWindow()->setCursor( mCursor );
			return;
		}

		if (hit_obj->isAttachment() && !hit_obj->isHUDAttachment())
		{
			LLVOAvatar* avatar = LLVOAvatar::findAvatarFromAttachment( hit_obj );
			if (!avatar)
			{
				mLastAccept = ACCEPT_NO;
				mCursor = UI_CURSOR_NO;
				gViewerWindow->getWindow()->setCursor( mCursor );
				return;
			}
			hit_obj = avatar;
		}

		if (hit_obj->isAvatar())
		{
			if (((LLVOAvatar*) hit_obj)->isSelf())
			{
				target = DT_SELF;
				hit_face = -1;
			}
			else
			{
				target = DT_AVATAR;
				hit_face = -1;
			}
		}
		else
		{
			target = DT_OBJECT;
			hit_face = pick_info.mObjectFace;
			highlight_object = true;
		}
	}
	else if (pick_info.mPickType == LLPickInfo::PICK_LAND)
	{
		target = DT_LAND;
		hit_face = -1;
	}

	mLastAccept = ACCEPT_YES_MULTI;

	for (mCurItemIndex = 0; mCurItemIndex < (S32)mCargoIDs.size(); mCurItemIndex++)
	{
		const S32 item_index = mCurItemIndex;
		const EDragAndDropType dad_type = mCargoTypes[item_index];
		// Call the right implementation function
		mLastAccept = (EAcceptance)llmin(
			(U32)mLastAccept,
			(U32)callMemberFunction(*this, 
									LLDragAndDropDictionary::instance().get(dad_type, target))
				(hit_obj, hit_face, pick_info.mKeyMask, false));
	}

	if (mDrop && ((U32)mLastAccept >= ACCEPT_YES_COPY_SINGLE))
	{
		// if target allows multi-drop or there is only one item being dropped, go ahead
		if ((mLastAccept >= ACCEPT_YES_COPY_MULTI) || (mCargoIDs.size() == 1))
		{
			// Target accepts multi, or cargo is a single-drop
			for (mCurItemIndex = 0; mCurItemIndex < (S32)mCargoIDs.size(); mCurItemIndex++)
			{
				const S32 item_index = mCurItemIndex;
				const EDragAndDropType dad_type = mCargoTypes[item_index];
				// Call the right implementation function
				callMemberFunction(*this, LLDragAndDropDictionary::instance().get(dad_type, target))
					(hit_obj, hit_face, pick_info.mKeyMask, true);
			}
		}
		else
		{
			// Target does not accept multi, but cargo is multi
			mLastAccept = ACCEPT_NO;
		}
	}

	if (highlight_object && mLastAccept > ACCEPT_NO_LOCKED)
	{
		// if any item being dragged will be applied to the object under our cursor
		// highlight that object
		for (S32 i = 0; i < (S32)mCargoIDs.size(); i++)
		{
			if (mCargoTypes[i] != DAD_OBJECT || (pick_info.mKeyMask & MASK_CONTROL))
			{
				LLSelectMgr::getInstance()->highlightObjectAndFamily(hit_obj);
				break;
			}
		}
	}
	ECursorType cursor = acceptanceToCursor( mLastAccept );
	gViewerWindow->getWindow()->setCursor( cursor );

	mLastHitPos = pick_info.mPosGlobal;
	mLastCameraPos = gAgentCamera.getCameraPositionGlobal();
}

// static
bool LLToolDragAndDrop::handleDropMaterialProtections(LLViewerObject* hit_obj,
													 LLInventoryItem* item,
													 LLToolDragAndDrop::ESource source,
													 const LLUUID& src_id)
{
	if (!item) return false;

	// Always succeed if....
	// material is from the library 
	// or already in the contents of the object
	if (SOURCE_LIBRARY == source)
	{
		// dropping a material from the library always just works.
		return true;
	}

	// In case the inventory has not been loaded (e.g. due to some recent operation
	// causing a dirty inventory) and we can do an update, stall the user
	// while fetching the inventory.
	//
	// Fetch if inventory is dirty and listener is present (otherwise we will not receive update)
	if (hit_obj->isInventoryDirty() && hit_obj->hasInventoryListeners())
	{
		hit_obj->requestInventory();
		LLSD args;
        if (LLAssetType::AT_MATERIAL == item->getType())
        {
            args["ERROR_MESSAGE"] = "Unable to add material.\nPlease wait a few seconds and try again.";
        }
        else
        {
            args["ERROR_MESSAGE"] = "Unable to add texture.\nPlease wait a few seconds and try again.";
        }
		LLNotificationsUtil::add("ErrorMessage", args);
		return false;
	}
    // Make sure to verify both id and type since 'null'
    // is a shared default for some asset types.
    if (hit_obj->getInventoryItemByAsset(item->getAssetUUID(), item->getType()))
	{
		// if the asset is already in the object's inventory 
		// then it can always be added to a side.
		// This saves some work if the task's inventory is already loaded
		// and ensures that the asset item is only added once.
		return true;
	}
	
	LLPointer<LLViewerInventoryItem> new_item = new LLViewerInventoryItem(item);
	if (!item->getPermissions().allowOperationBy(PERM_COPY, gAgent.getID()))
	{
		// Check that we can add the material as inventory to the object
		if (willObjectAcceptInventory(hit_obj,item) < ACCEPT_YES_COPY_SINGLE )
		{
			return false;
		}
		// make sure the object has the material in it's inventory.
		if (SOURCE_AGENT == source)
		{
			// Remove the material from local inventory. The server
			// will actually remove the item from agent inventory.
			gInventory.deleteObject(item->getUUID());
			gInventory.notifyObservers();
		}
		else if (SOURCE_WORLD == source)
		{
			// *FIX: if the objects are in different regions, and the
			// source region has crashed, you can bypass these
			// permissions.
			LLViewerObject* src_obj = gObjectList.findObject(src_id);
			if (src_obj)
			{
				src_obj->removeInventory(item->getUUID());
			}
			else
			{
				LL_WARNS() << "Unable to find source object." << LL_ENDL;
				return false;
			}
		}
		// Add the asset item to the target object's inventory.
        if (LLAssetType::AT_TEXTURE == new_item->getType()
            || LLAssetType::AT_MATERIAL == new_item->getType())
        {
            hit_obj->updateMaterialInventory(new_item, TASK_INVENTORY_ITEM_KEY, true);
        }
		else
		{
			hit_obj->updateInventory(new_item, TASK_INVENTORY_ITEM_KEY, true);
		}
		// Force the object to update and refetch its inventory so it has this asset.
		hit_obj->dirtyInventory();
		hit_obj->requestInventory();
		// TODO: Check to see if adding the item was successful; if not, then
		// we should return false here. This will requre a separate listener
		// since without listener, we have no way to receive update
	}
	else if (!item->getPermissions().allowOperationBy(PERM_TRANSFER,
													 gAgent.getID()))
	{
		// Check that we can add the asset as inventory to the object
		if (willObjectAcceptInventory(hit_obj,item) < ACCEPT_YES_COPY_SINGLE )
		{
			return false;
		}
		// *FIX: may want to make sure agent can paint hit_obj.

		// Add the asset item to the target object's inventory.
		if (LLAssetType::AT_TEXTURE == new_item->getType()
            || LLAssetType::AT_MATERIAL == new_item->getType())
		{
			hit_obj->updateMaterialInventory(new_item, TASK_INVENTORY_ITEM_KEY, true);
		}
		else
		{
			hit_obj->updateInventory(new_item, TASK_INVENTORY_ITEM_KEY, true);
		}
		// Force the object to update and refetch its inventory so it has this asset.
		hit_obj->dirtyInventory();
		hit_obj->requestInventory();
		// TODO: Check to see if adding the item was successful; if not, then
		// we should return false here. This will requre a separate listener
		// since without listener, we have no way to receive update
	}
	else if (LLAssetType::AT_MATERIAL == new_item->getType() &&
             !item->getPermissions().allowOperationBy(PERM_MODIFY, gAgent.getID()))
	{
		// Check that we can add the material as inventory to the object
		if (willObjectAcceptInventory(hit_obj,item) < ACCEPT_YES_COPY_SINGLE )
		{
			return false;
		}
		// *FIX: may want to make sure agent can paint hit_obj.

		// Add the material item to the target object's inventory.
        hit_obj->updateMaterialInventory(new_item, TASK_INVENTORY_ITEM_KEY, true);

		// Force the object to update and refetch its inventory so it has this material.
		hit_obj->dirtyInventory();
		hit_obj->requestInventory();
		// TODO: Check to see if adding the item was successful; if not, then
		// we should return false here. This will requre a separate listener
		// since without listener, we have no way to receive update
	}
	return true;
}

void set_texture_to_material(LLViewerObject* hit_obj,
                             S32 hit_face,
                             const LLUUID& asset_id,
                             LLGLTFMaterial::TextureInfo drop_channel)
{
    LLTextureEntry* te = hit_obj->getTE(hit_face);
    if (!te)
    {
        return;
    }

    const LLUUID base_mat_id = hit_obj->getRenderMaterialID(hit_face);
    if (base_mat_id.isNull())
    {
        return;
    }

    if (hit_obj->isInventoryDirty() && hit_obj->hasInventoryListeners())
    {
        hit_obj->requestInventory();
        return;
    }

    LLViewerInventoryItem* mat_item = hit_obj->getInventoryItemByAsset(base_mat_id);
    if (mat_item && !mat_item->getPermissions().allowModifyBy(gAgentID))
    {
        return;
    }

    LLPointer<LLGLTFMaterial> material = te->getGLTFMaterialOverride();

    // make a copy to not invalidate existing
    // material for multiple objects
    if (material.isNull())
    {
        // Start with a material override which does not make any changes
        material = new LLGLTFMaterial();
    }
    else
    {
        material = new LLGLTFMaterial(*material);
    }

    switch (drop_channel)
    {
        case LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR:
        default:
            {
                material->setBaseColorId(asset_id);
            }
            break;

        case LLGLTFMaterial::GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS:
            {
                material->setOcclusionRoughnessMetallicId(asset_id);
            }
            break;

        case LLGLTFMaterial::GLTF_TEXTURE_INFO_EMISSIVE:
            {
                material->setEmissiveId(asset_id);
            }
            break;

        case LLGLTFMaterial::GLTF_TEXTURE_INFO_NORMAL:
            {
                material->setNormalId(asset_id);
            }
            break;
    }
    LLGLTFMaterialList::queueModify(hit_obj, hit_face, material);
}

void LLToolDragAndDrop::dropTextureAllFaces(LLViewerObject* hit_obj,
											LLInventoryItem* item,
											LLToolDragAndDrop::ESource source,
											const LLUUID& src_id,
                                            bool remove_pbr)
{
	if (!item)
	{
		LL_WARNS() << "LLToolDragAndDrop::dropTextureAllFaces no texture item." << LL_ENDL;
		return;
	}
    S32 num_faces = hit_obj->getNumTEs();
    bool has_non_pbr_faces = false;
    for (S32 face = 0; face < num_faces; face++)
    {
        if (hit_obj->getRenderMaterialID(face).isNull())
        {
            has_non_pbr_faces = true;
            break;
        }
    }

    if (has_non_pbr_faces || remove_pbr)
    {
        bool res = handleDropMaterialProtections(hit_obj, item, source, src_id);
        if (!res)
        {
            return;
        }
    }
	LLUUID asset_id = item->getAssetUUID();

    // Overrides require textures to be copy and transfer free
    LLPermissions item_permissions = item->getPermissions();
    bool allow_adding_to_override = item_permissions.allowOperationBy(PERM_COPY, gAgent.getID());
    allow_adding_to_override &= item_permissions.allowOperationBy(PERM_TRANSFER, gAgent.getID());

	LLViewerTexture* image = LLViewerTextureManager::getFetchedTexture(asset_id);
	add(LLStatViewer::EDIT_TEXTURE, 1);
	for( S32 face = 0; face < num_faces; face++ )
	{
        if (remove_pbr)
        {
            hit_obj->setRenderMaterialID(face, LLUUID::null);
            hit_obj->setTEImage(face, image);
            dialog_refresh_all();
        }
        else if (hit_obj->getRenderMaterialID(face).isNull())
        {
            // update viewer side
            hit_obj->setTEImage(face, image);
            dialog_refresh_all();
        }
        else if (allow_adding_to_override)
        {
            set_texture_to_material(hit_obj, face, asset_id, LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR);
        }
	}

	// send the update to the simulator
    LLGLTFMaterialList::flushUpdates(nullptr);
	hit_obj->sendTEUpdate();
}

void LLToolDragAndDrop::dropMaterial(LLViewerObject* hit_obj,
                                     S32 hit_face,
                                     LLInventoryItem* item,
                                     LLToolDragAndDrop::ESource source,
                                     const LLUUID& src_id,
                                     bool all_faces)
{
    LLSelectNode* nodep = nullptr;
    if (hit_obj->isSelected())
    {
        // update object's saved materials
        nodep = LLSelectMgr::getInstance()->getSelection()->findNode(hit_obj);
    }

    // If user dropped a material onto face it implies
    // applying texture now without cancel, save to selection
    if (all_faces)
    {
        dropMaterialAllFaces(hit_obj, item, source, src_id);

        if (nodep)
        {
            uuid_vec_t material_ids;
            gltf_materials_vec_t override_materials;
            S32 num_faces = hit_obj->getNumTEs();
            for (S32 face = 0; face < num_faces; face++)
            {
                material_ids.push_back(hit_obj->getRenderMaterialID(face));
                override_materials.push_back(nullptr);
            }
            nodep->saveGLTFMaterials(material_ids, override_materials);
        }
    }
    else
    {
        dropMaterialOneFace(hit_obj, hit_face, item, source, src_id);

        // If user dropped a material onto face it implies
        // applying texture now without cancel, save to selection
        if (nodep
            && gFloaterTools->getVisible()
            && nodep->mSavedGLTFMaterialIds.size() > hit_face)
        {
            nodep->mSavedGLTFMaterialIds[hit_face] = hit_obj->getRenderMaterialID(hit_face);
            nodep->mSavedGLTFOverrideMaterials[hit_face] = nullptr;
        }
    }
}

void LLToolDragAndDrop::dropMaterialOneFace(LLViewerObject* hit_obj,
    S32 hit_face,
    LLInventoryItem* item,
    LLToolDragAndDrop::ESource source,
    const LLUUID& src_id)
{
    if (hit_face == -1) return;
    if (!item || item->getInventoryType() != LLInventoryType::IT_MATERIAL)
    {
        LL_WARNS() << "LLToolDragAndDrop::dropTextureOneFace no material item." << LL_ENDL;
        return;
    }

    // SL-20013 must save asset_id before handleDropMaterialProtections since our item instance
    // may be deleted if it is moved into task inventory
    LLUUID asset_id = item->getAssetUUID();
    bool success = handleDropMaterialProtections(hit_obj, item, source, src_id);
    if (!success)
    {
        return;
    }

    if (asset_id.isNull())
    {
        // use blank material
        asset_id = BLANK_MATERIAL_ASSET_ID;
    }

    hit_obj->setRenderMaterialID(hit_face, asset_id);

    dialog_refresh_all();

    // send the update to the simulator
    hit_obj->sendTEUpdate();
}


void LLToolDragAndDrop::dropMaterialAllFaces(LLViewerObject* hit_obj,
    LLInventoryItem* item,
    LLToolDragAndDrop::ESource source,
    const LLUUID& src_id)
{
    if (!item || item->getInventoryType() != LLInventoryType::IT_MATERIAL)
    {
        LL_WARNS() << "LLToolDragAndDrop::dropTextureAllFaces no material item." << LL_ENDL;
        return;
    }

    // SL-20013 must save asset_id before handleDropMaterialProtections since our item instance
    // may be deleted if it is moved into task inventory
    LLUUID asset_id = item->getAssetUUID();
    bool success = handleDropMaterialProtections(hit_obj, item, source, src_id);

    if (!success)
    {
        return;
    }

    if (asset_id.isNull())
    {
        // use blank material
        asset_id = BLANK_MATERIAL_ASSET_ID;
    }

    hit_obj->setRenderMaterialIDs(asset_id);
    dialog_refresh_all();
    // send the update to the simulator
    hit_obj->sendTEUpdate();
}


void LLToolDragAndDrop::dropMesh(LLViewerObject* hit_obj,
								 LLInventoryItem* item,
								 LLToolDragAndDrop::ESource source,
								 const LLUUID& src_id)
{
	if (!item)
	{
		LL_WARNS() << "no inventory item." << LL_ENDL;
		return;
	}
	LLUUID asset_id = item->getAssetUUID();
	bool success = handleDropMaterialProtections(hit_obj, item, source, src_id);
	if(!success)
	{
		return;
	}

	LLSculptParams sculpt_params;
	sculpt_params.setSculptTexture(asset_id, LL_SCULPT_TYPE_MESH);
	hit_obj->setParameterEntry(LLNetworkData::PARAMS_SCULPT, sculpt_params, true);
	
	dialog_refresh_all();
}

void LLToolDragAndDrop::dropTexture(LLViewerObject* hit_obj,
                                    S32 hit_face,
                                    LLInventoryItem* item,
                                    ESource source,
                                    const LLUUID& src_id,
                                    bool all_faces,
                                    bool remove_pbr,
                                    S32 tex_channel)
{
    LLSelectNode* nodep = nullptr;
    if (hit_obj->isSelected())
    {
        // update object's saved textures
        nodep = LLSelectMgr::getInstance()->getSelection()->findNode(hit_obj);
    }

    if (all_faces)
    {
        dropTextureAllFaces(hit_obj, item, source, src_id, remove_pbr);

        // If user dropped a texture onto face it implies
        // applying texture now without cancel, save to selection
        if (nodep)
        {
            uuid_vec_t texture_ids;
            uuid_vec_t material_ids;
            gltf_materials_vec_t override_materials;
            S32 num_faces = hit_obj->getNumTEs();
            for (S32 face = 0; face < num_faces; face++)
            {
                LLViewerTexture* tex = hit_obj->getTEImage(face);
                if (tex != nullptr)
                {
                    texture_ids.push_back(tex->getID());
                }
                else
                {
                    texture_ids.push_back(LLUUID::null);
                }

                // either removed or modified materials
                if (remove_pbr)
                {
                    material_ids.push_back(LLUUID::null);
                }
                else
                {
                    material_ids.push_back(hit_obj->getRenderMaterialID(face));
                }

                LLTextureEntry* te = hit_obj->getTE(hit_face);
                if (te && !remove_pbr)
                {
                    override_materials.push_back(te->getGLTFMaterialOverride());
                }
                else
                {
                    override_materials.push_back(nullptr);
                }
            }

            nodep->saveTextures(texture_ids);
            nodep->saveGLTFMaterials(material_ids, override_materials);
        }
    }
    else
    {
        dropTextureOneFace(hit_obj, hit_face, item, source, src_id, remove_pbr, tex_channel);

        // If user dropped a texture onto face it implies
        // applying texture now without cancel, save to selection
        LLPanelFace* panel_face = gFloaterTools->getPanelFace();
        if (nodep
            && gFloaterTools->getVisible()
            && panel_face
            && panel_face->getTextureDropChannel() == 0 /*texture*/
            && nodep->mSavedTextures.size() > hit_face)
        {
            LLViewerTexture* tex = hit_obj->getTEImage(hit_face);
            if (tex != nullptr)
            {
                nodep->mSavedTextures[hit_face] = tex->getID();
            }
            else
            {
                nodep->mSavedTextures[hit_face] = LLUUID::null;
            }

            LLTextureEntry* te = hit_obj->getTE(hit_face);
            if (te && !remove_pbr)
            {
                nodep->mSavedGLTFOverrideMaterials[hit_face] = te->getGLTFMaterialOverride();
            }
            else
            {
                nodep->mSavedGLTFOverrideMaterials[hit_face] = nullptr;
            }
        }
    }
}

void LLToolDragAndDrop::dropTextureOneFace(LLViewerObject* hit_obj,
										   S32 hit_face,
										   LLInventoryItem* item,
										   LLToolDragAndDrop::ESource source,
										   const LLUUID& src_id,
                                           bool remove_pbr,
                                           S32 tex_channel)
{
	if (hit_face == -1) return;
	if (!item)
	{
		LL_WARNS() << "LLToolDragAndDrop::dropTextureOneFace no texture item." << LL_ENDL;
		return;
	}

    LLUUID asset_id = item->getAssetUUID();

    if (hit_obj->getRenderMaterialID(hit_face).notNull() && !remove_pbr)
    {
        // Overrides require textures to be copy and transfer free
        LLPermissions item_permissions = item->getPermissions();
        bool allow_adding_to_override = item_permissions.allowOperationBy(PERM_COPY, gAgent.getID());
        allow_adding_to_override &= item_permissions.allowOperationBy(PERM_TRANSFER, gAgent.getID());

        if (allow_adding_to_override)
        {
            LLGLTFMaterial::TextureInfo drop_channel = LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR;
            LLPanelFace* panel_face = gFloaterTools->getPanelFace();
            if (gFloaterTools->getVisible() && panel_face)
            {
                drop_channel = panel_face->getPBRDropChannel();
            }
            set_texture_to_material(hit_obj, hit_face, asset_id, drop_channel);
            LLGLTFMaterialList::flushUpdates(nullptr);
        }
        return;
    }
	bool success = handleDropMaterialProtections(hit_obj, item, source, src_id);
	if (!success)
	{
		return;
	}
    if (remove_pbr)
    {
        hit_obj->setRenderMaterialID(hit_face, LLUUID::null);
    }

	// update viewer side image in anticipation of update from simulator
	LLViewerTexture* image = LLViewerTextureManager::getFetchedTexture(asset_id);
	add(LLStatViewer::EDIT_TEXTURE, 1);

	LLTextureEntry* tep = hit_obj->getTE(hit_face);

	LLPanelFace* panel_face = gFloaterTools->getPanelFace();

	if (gFloaterTools->getVisible() && panel_face)
	{
        tex_channel = (tex_channel > -1) ? tex_channel : panel_face->getTextureDropChannel();
        switch (tex_channel)
		{

		case 0:
		default:
			{
				hit_obj->setTEImage(hit_face, image);
			}
			break;

		case 1:
            if (tep)
			{
				LLMaterialPtr old_mat = tep->getMaterialParams();
				LLMaterialPtr new_mat = panel_face->createDefaultMaterial(old_mat);
				new_mat->setNormalID(asset_id);
				tep->setMaterialParams(new_mat);
				hit_obj->setTENormalMap(hit_face, asset_id);
				LLMaterialMgr::getInstance()->put(hit_obj->getID(), hit_face, *new_mat);
			}
			break;

		case 2:
            if (tep)
			{
				LLMaterialPtr old_mat = tep->getMaterialParams();
				LLMaterialPtr new_mat = panel_face->createDefaultMaterial(old_mat);
				new_mat->setSpecularID(asset_id);
				tep->setMaterialParams(new_mat);
				hit_obj->setTESpecularMap(hit_face, asset_id);
				LLMaterialMgr::getInstance()->put(hit_obj->getID(), hit_face, *new_mat);
			}
			break;
		}
	}
	else
	{
		hit_obj->setTEImage(hit_face, image);
	}
	
	dialog_refresh_all();

	// send the update to the simulator
	hit_obj->sendTEUpdate();
}


void LLToolDragAndDrop::dropScript(LLViewerObject* hit_obj,
								   LLInventoryItem* item,
								   bool active,
								   ESource source,
								   const LLUUID& src_id)
{
	// *HACK: In order to resolve SL-22177, we need to block drags
	// from notecards and objects onto other objects.
	if ((SOURCE_WORLD == LLToolDragAndDrop::getInstance()->mSource)
	   || (SOURCE_NOTECARD == LLToolDragAndDrop::getInstance()->mSource))
	{
		LL_WARNS() << "Call to LLToolDragAndDrop::dropScript() from world"
			<< " or notecard." << LL_ENDL;
		return;
	}
	if (hit_obj && item)
	{
		LLPointer<LLViewerInventoryItem> new_script = new LLViewerInventoryItem(item);
		if (!item->getPermissions().allowCopyBy(gAgent.getID()))
		{
			if (SOURCE_AGENT == source)
			{
				// Remove the script from local inventory. The server
				// will actually remove the item from agent inventory.
				gInventory.deleteObject(item->getUUID());
				gInventory.notifyObservers();
			}
			else if (SOURCE_WORLD == source)
			{
				// *FIX: if the objects are in different regions, and
				// the source region has crashed, you can bypass
				// these permissions.
				LLViewerObject* src_obj = gObjectList.findObject(src_id);
				if (src_obj)
				{
					src_obj->removeInventory(item->getUUID());
				}
				else
				{
					LL_WARNS() << "Unable to find source object." << LL_ENDL;
					return;
				}
			}
		}
		hit_obj->saveScript(new_script, active, true);
		gFloaterTools->dirty();

		// VEFFECT: SetScript
		LLHUDEffectSpiral *effectp = (LLHUDEffectSpiral *)LLHUDManager::getInstance()->createViewerEffect(LLHUDObject::LL_HUD_EFFECT_BEAM, true);
		effectp->setSourceObject(gAgentAvatarp);
		effectp->setTargetObject(hit_obj);
		effectp->setDuration(LL_HUD_DUR_SHORT);
		effectp->setColor(LLColor4U(gAgent.getEffectColor()));
	}
}

void LLToolDragAndDrop::dropObject(LLViewerObject* raycast_target,
				   bool bypass_sim_raycast,
				   bool from_task_inventory,
				   bool remove_from_inventory)
{
	LLViewerRegion* regionp = LLWorld::getInstance()->getRegionFromPosGlobal(mLastHitPos);
	if (!regionp)
	{
		LL_WARNS() << "Couldn't find region to rez object" << LL_ENDL;
		return;
	}

	//LL_INFOS() << "Rezzing object" << LL_ENDL;
	make_ui_sound("UISndObjectRezIn");
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return;
	
	//if (regionp
	//	&& (regionp->getRegionFlag(REGION_FLAGS_SANDBOX)))
	//{
	//	LLFirstUse::useSandbox();
	//}
	// check if it cannot be copied, and mark as remove if it is -
	// this will remove the object from inventory after rez. Only
	// bother with this check if we would not normally remove from
	// inventory.
	if (!remove_from_inventory
		&& !item->getPermissions().allowCopyBy(gAgent.getID()))
	{
		remove_from_inventory = true;
	}

	// Limit raycast to a single object.  
	// Speeds up server raycast + avoid problems with server ray
	// hitting objects that were clipped by the near plane or culled
	// on the viewer.
	LLUUID ray_target_id;
	if (raycast_target)
	{
		ray_target_id = raycast_target->getID();
	}
	else
	{
		ray_target_id.setNull();
	}

	// Check if it's in the trash.
	bool is_in_trash = false;
	const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
	if (gInventory.isObjectDescendentOf(item->getUUID(), trash_id))
	{
		is_in_trash = true;
	}

	LLUUID source_id = from_task_inventory ? mSourceID : LLUUID::null;

	// Select the object only if we're editing.
	bool rez_selected = LLToolMgr::getInstance()->inEdit();


	LLVector3 ray_start = regionp->getPosRegionFromGlobal(mLastCameraPos);
	LLVector3 ray_end   = regionp->getPosRegionFromGlobal(mLastHitPos);
	// currently the ray's end point is an approximation,
	// and is sometimes too short (causing failure.)  so we
	// double the ray's length:
	if (!bypass_sim_raycast)
	{
		LLVector3 ray_direction = ray_start - ray_end;
		ray_end = ray_end - ray_direction;
	}


	// Message packing code should be it's own uninterrupted block
	LLMessageSystem* msg = gMessageSystem;
	if (mSource == SOURCE_NOTECARD)
	{
		LLUIUsage::instance().logCommand("Object.RezObjectFromNotecard");
		msg->newMessageFast(_PREHASH_RezObjectFromNotecard);
	}
	else
	{
		LLUIUsage::instance().logCommand("Object.RezObject");
		msg->newMessageFast(_PREHASH_RezObject);
	}
	msg->nextBlockFast(_PREHASH_AgentData);
	msg->addUUIDFast(_PREHASH_AgentID,  gAgent.getID());
	msg->addUUIDFast(_PREHASH_SessionID,  gAgent.getSessionID());
	msg->addUUIDFast(_PREHASH_GroupID, gAgent.getGroupID());

	msg->nextBlock("RezData");
	// if it's being rezzed from task inventory, we need to enable
	// saving it back into the task inventory.
	// *FIX: We can probably compress this to a single byte, since I
	// think folderid == mSourceID. This will be a later
	// optimization.
	msg->addUUIDFast(_PREHASH_FromTaskID, source_id);
	msg->addU8Fast(_PREHASH_BypassRaycast, (U8) bypass_sim_raycast);
	msg->addVector3Fast(_PREHASH_RayStart, ray_start);
	msg->addVector3Fast(_PREHASH_RayEnd, ray_end);
	msg->addUUIDFast(_PREHASH_RayTargetID, ray_target_id );
	msg->addBOOLFast(_PREHASH_RayEndIsIntersection, false);
	msg->addBOOLFast(_PREHASH_RezSelected, rez_selected);
	msg->addBOOLFast(_PREHASH_RemoveItem, remove_from_inventory);

	// deal with permissions slam logic
	pack_permissions_slam(msg, item->getFlags(), item->getPermissions());

	LLUUID folder_id = item->getParentUUID();
	if ((SOURCE_LIBRARY == mSource) || (is_in_trash))
	{
		// since it's coming from the library or trash, we want to not
		// 'take' it back to the same place.
		item->setParent(LLUUID::null);
		// *TODO this code isn't working - the parent (FolderID) is still
		// set when the object is "taken".  so code on the "take" side is
		// checking for trash and library as well (llviewermenu.cpp)
	}
	if (mSource == SOURCE_NOTECARD)
	{
		msg->nextBlockFast(_PREHASH_NotecardData);
		msg->addUUIDFast(_PREHASH_NotecardItemID, mSourceID);
		msg->addUUIDFast(_PREHASH_ObjectID, mObjectID);
		msg->nextBlockFast(_PREHASH_InventoryData);
		msg->addUUIDFast(_PREHASH_ItemID, item->getUUID());
	}
	else
	{
		msg->nextBlockFast(_PREHASH_InventoryData);
		item->packMessage(msg);
	}
	msg->sendReliable(regionp->getHost());
	// back out the change. no actual internal changes take place.
	item->setParent(folder_id); 

	// If we're going to select it, get ready for the incoming
	// selected object.
	if (rez_selected)
	{
		LLSelectMgr::getInstance()->deselectAll();
		gViewerWindow->getWindow()->incBusyCount();
	}

	if (remove_from_inventory)
	{
		// Delete it from inventory immediately so that users cannot
		// easily bypass copy protection in laggy situations. If the
		// rez fails, we will put it back on the server.
		gInventory.deleteObject(item->getUUID());
		gInventory.notifyObservers();
	}

	// VEFFECT: DropObject
	LLHUDEffectSpiral *effectp = (LLHUDEffectSpiral *)LLHUDManager::getInstance()->createViewerEffect(LLHUDObject::LL_HUD_EFFECT_BEAM, true);
	effectp->setSourceObject(gAgentAvatarp);
	effectp->setPositionGlobal(mLastHitPos);
	effectp->setDuration(LL_HUD_DUR_SHORT);
	effectp->setColor(LLColor4U(gAgent.getEffectColor()));

	add(LLStatViewer::OBJECT_REZ, 1);
}

void LLToolDragAndDrop::dropInventory(LLViewerObject* hit_obj,
									  LLInventoryItem* item,
									  LLToolDragAndDrop::ESource source,
									  const LLUUID& src_id)
{
	// *HACK: In order to resolve SL-22177, we need to block drags
	// from notecards and objects onto other objects.
	if ((SOURCE_WORLD == LLToolDragAndDrop::getInstance()->mSource)
	   || (SOURCE_NOTECARD == LLToolDragAndDrop::getInstance()->mSource))
	{
		LL_WARNS() << "Call to LLToolDragAndDrop::dropInventory() from world"
			<< " or notecard." << LL_ENDL;
		return;
	}

	LLPointer<LLViewerInventoryItem> new_item = new LLViewerInventoryItem(item);
	time_t creation_date = time_corrected();
	new_item->setCreationDate(creation_date);

	if (!item->getPermissions().allowCopyBy(gAgent.getID()))
	{
		if (SOURCE_AGENT == source)
		{
			// Remove the inventory item from local inventory. The
			// server will actually remove the item from agent
			// inventory.
			gInventory.deleteObject(item->getUUID());
			gInventory.notifyObservers();
		}
		else if (SOURCE_WORLD == source)
		{
			// *FIX: if the objects are in different regions, and the
			// source region has crashed, you can bypass these
			// permissions.
			LLViewerObject* src_obj = gObjectList.findObject(src_id);
			if (src_obj)
			{
				src_obj->removeInventory(item->getUUID());
			}
			else
			{
				LL_WARNS() << "Unable to find source object." << LL_ENDL;
				return;
			}
		}
	}
	hit_obj->updateInventory(new_item, TASK_INVENTORY_ITEM_KEY, true);
	if (LLFloaterReg::instanceVisible("build"))
	{
		// *FIX: only show this if panel not expanded?
		LLFloaterReg::showInstance("build", "Content");
	}

	// VEFFECT: AddToInventory
	LLHUDEffectSpiral *effectp = (LLHUDEffectSpiral *)LLHUDManager::getInstance()->createViewerEffect(LLHUDObject::LL_HUD_EFFECT_BEAM, true);
	effectp->setSourceObject(gAgentAvatarp);
	effectp->setTargetObject(hit_obj);
	effectp->setDuration(LL_HUD_DUR_SHORT);
	effectp->setColor(LLColor4U(gAgent.getEffectColor()));
	gFloaterTools->dirty();
}

// accessor that looks at permissions, copyability, and names of
// inventory items to determine if a drop would be ok.
EAcceptance LLToolDragAndDrop::willObjectAcceptInventory(LLViewerObject* obj, LLInventoryItem* item, EDragAndDropType type)
{
	// check the basics
	if (!item || !obj)
		return ACCEPT_NO;

	// HACK: downcast
	LLViewerInventoryItem* vitem = (LLViewerInventoryItem*)item;
	if (!vitem->isFinished() && (type != DAD_CATEGORY))
	{
		// Note: for DAD_CATEGORY we assume that folder version check passed and folder 
		// is complete, meaning that items inside are up to date. 
		// (isFinished() == false) at the moment shows that item was loaded from cache.
		// Library or agent inventory only.
		return ACCEPT_NO;
	}
	if (vitem->getIsLinkType())
		return ACCEPT_NO; // No giving away links

	// deny attempts to drop from an object onto itself. This is to
	// help make sure that drops that are from an object to an object
	// don't have to worry about order of evaluation. Think of this
	// like check for self in assignment.
	if (obj->getID() == item->getParentUUID())
	{
		return ACCEPT_NO;
	}
	
	//bool copy = (perm.allowCopyBy(gAgent.getID(),
	//							  gAgent.getGroupID())
	//			 && (obj->mPermModify || obj->mFlagAllowInventoryAdd));
	bool worn = false;
	LLVOAvatarSelf* my_avatar = NULL;
	switch (item->getType())
	{
	case LLAssetType::AT_OBJECT:
		my_avatar = gAgentAvatarp;
		if(my_avatar && my_avatar->isWearingAttachment(item->getUUID()))
		{
				worn = true;
		}
		break;
	case LLAssetType::AT_BODYPART:
	case LLAssetType::AT_CLOTHING:
		if (gAgentWearables.isWearingItem(item->getUUID()))
		{
			worn = true;
		}
		break;
	case LLAssetType::AT_CALLINGCARD:
		// Calling Cards in object are disabled for now
		// because of incomplete LSL support. See STORM-1117.
		return ACCEPT_NO;
	default:
		break;
	}
	const LLPermissions& perm = item->getPermissions();
	bool modify = (obj->permModify() || obj->flagAllowInventoryAdd());
	bool transfer = false;
	if ((obj->permYouOwner() && (perm.getOwner() == gAgent.getID()))
	   || perm.allowOperationBy(PERM_TRANSFER, gAgent.getID()))
	{
		transfer = true;
	}
	bool volume = (LL_PCODE_VOLUME == obj->getPCode());
	bool attached = obj->isAttachment();
	bool unrestricted = (perm.getMaskBase() & PERM_ITEM_UNRESTRICTED) == PERM_ITEM_UNRESTRICTED;

	if (attached && !unrestricted)
	{
        // Attachments are in world and in inventory simultaneously,
        // at the moment server doesn't support such a situation.
		return ACCEPT_NO_LOCKED;
	}

	if (modify && transfer && volume && !worn)
	{
		return ACCEPT_YES_MULTI;
	}

	if (!modify)
	{
		return ACCEPT_NO_LOCKED;
	}

	return ACCEPT_NO;
}


static void give_inventory_cb(const LLSD& notification, const LLSD& response)
{
	S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
	// if Cancel pressed
	if (option == 1)
	{
		return;
	}

	LLSD payload = notification["payload"];
	const LLUUID& session_id = payload["session_id"];
	const LLUUID& agent_id = payload["agent_id"];
	LLViewerInventoryItem * inv_item =  gInventory.getItem(payload["item_id"]);
	LLViewerInventoryCategory * inv_cat =  gInventory.getCategory(payload["item_id"]);
	if (NULL == inv_item && NULL == inv_cat)
	{
		llassert( false );
		return;
	}
	bool successfully_shared;
	if (inv_item)
	{
		successfully_shared = LLGiveInventory::doGiveInventoryItem(agent_id, inv_item, session_id);
	}
	else
	{
		successfully_shared = LLGiveInventory::doGiveInventoryCategory(agent_id, inv_cat, session_id);
	}
	if (successfully_shared)
	{
		if ("avatarpicker" == payload["d&d_dest"].asString())
		{
			LLFloaterReg::hideInstance("avatar_picker");
		}
		LLNotificationsUtil::add("ItemsShared");
	}
}

static void show_object_sharing_confirmation(const std::string name,
					   LLInventoryObject* inv_item,
					   const LLSD& dest,
					   const LLUUID& dest_agent,
					   const LLUUID& session_id = LLUUID::null)
{
	if (!inv_item)
	{
		llassert(NULL != inv_item);
		return;
	}
	LLSD substitutions;
	substitutions["RESIDENTS"] = name;
	substitutions["ITEMS"] = inv_item->getName();
	LLSD payload;
	payload["agent_id"] = dest_agent;
	payload["item_id"] = inv_item->getUUID();
	payload["session_id"] = session_id;
	payload["d&d_dest"] = dest.asString();
	LLNotificationsUtil::add("ShareItemsConfirmation", substitutions, payload, &give_inventory_cb);
}

static void get_name_cb(const LLUUID& id,
						const LLAvatarName& av_name,
						LLInventoryObject* inv_obj,
						const LLSD& dest,
						const LLUUID& dest_agent)
{
	show_object_sharing_confirmation(av_name.getUserName(),
								     inv_obj,
								     dest,
						  		     id,
								     LLUUID::null);
}

// function used as drag-and-drop handler for simple agent give inventory requests
//static
bool LLToolDragAndDrop::handleGiveDragAndDrop(LLUUID dest_agent, LLUUID session_id, bool drop,
											  EDragAndDropType cargo_type,
											  void* cargo_data,
											  EAcceptance* accept,
											  const LLSD& dest)
{
	// check the type
	switch(cargo_type)
	{
	case DAD_TEXTURE:
	case DAD_SOUND:
	case DAD_LANDMARK:
	case DAD_SCRIPT:
	case DAD_OBJECT:
	case DAD_NOTECARD:
	case DAD_CLOTHING:
	case DAD_BODYPART:
	case DAD_ANIMATION:
	case DAD_GESTURE:
	case DAD_CALLINGCARD:
	case DAD_MESH:
	case DAD_CATEGORY:
    case DAD_SETTINGS:
    case DAD_MATERIAL:
	{
		LLInventoryObject* inv_obj = (LLInventoryObject*)cargo_data;
		if(gInventory.getCategory(inv_obj->getUUID()) || (gInventory.getItem(inv_obj->getUUID())
			&& LLGiveInventory::isInventoryGiveAcceptable(dynamic_cast<LLInventoryItem*>(inv_obj))))
		{
			// *TODO: get multiple object transfers working
			*accept = ACCEPT_YES_COPY_SINGLE;
			if(drop)
			{
				LLIMModel::LLIMSession * session = LLIMModel::instance().findIMSession(session_id);

				// If no IM session found get the destination agent's name by id.
				if (NULL == session)
				{
					LLAvatarName av_name;

					// If destination agent's name is found in cash proceed to showing the confirmation dialog.
					// Otherwise set up a callback to show the dialog when the name arrives.
					if (LLAvatarNameCache::get(dest_agent, &av_name))
					{
						show_object_sharing_confirmation(av_name.getUserName(), inv_obj, dest, dest_agent, LLUUID::null);
					}
					else
					{
						LLAvatarNameCache::get(dest_agent, boost::bind(&get_name_cb, _1, _2, inv_obj, dest, dest_agent));
					}

					return true;
				}
				std::string dest_name = session->mName;
				LLAvatarName av_name;
				if(LLAvatarNameCache::get(dest_agent, &av_name))
				{
					dest_name = av_name.getCompleteName();
				}
				// If an IM session with destination agent is found item offer will be logged in this session.
				show_object_sharing_confirmation(dest_name, inv_obj, dest, dest_agent, session_id);
			}
		}
		else
		{
			// It's not in the user's inventory (it's probably
			// in an object's contents), so disallow dragging
			// it here.  You can't give something you don't
			// yet have.
			*accept = ACCEPT_NO;
		}
		break;
	}
	default:
		*accept = ACCEPT_NO;
		break;
	}

	return true;
}



///
/// Methods called in the drag & drop array
///

EAcceptance LLToolDragAndDrop::dad3dNULL(
	LLViewerObject*, S32, MASK, bool)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dNULL()" << LL_ENDL;
	return ACCEPT_NO;
}

EAcceptance LLToolDragAndDrop::dad3dRezAttachmentFromInv(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dRezAttachmentFromInv()" << LL_ENDL;
	// must be in the user's inventory
	if(mSource != SOURCE_AGENT && mSource != SOURCE_LIBRARY)
	{
		return ACCEPT_NO;
	}

	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;

	// must not be in the trash
	const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
	if( gInventory.isObjectDescendentOf( item->getUUID(), trash_id ) )
	{
		return ACCEPT_NO;
	}

	// must not be already wearing it
	LLVOAvatarSelf* avatar = gAgentAvatarp;
	if( !avatar || avatar->isWearingAttachment(item->getUUID()) )
	{
		return ACCEPT_NO;
	}

	const LLUUID &outbox_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_OUTBOX);
	if(outbox_id.notNull() && gInventory.isObjectDescendentOf(item->getUUID(), outbox_id))
	{
		// Legacy
		return ACCEPT_NO;
	}


	if( drop )
	{
		if(mSource == SOURCE_LIBRARY)
		{
			LLPointer<LLInventoryCallback> cb = new LLBoostFuncInventoryCallback(boost::bind(rez_attachment_cb, _1, (LLViewerJointAttachment*)0));
			copy_inventory_item(
				gAgent.getID(),
				item->getPermissions().getOwner(),
				item->getUUID(),
				LLUUID::null,
				std::string(),
				cb);
		}
		else
		{
			rez_attachment(item, 0);
		}
	}
	return ACCEPT_YES_SINGLE;
}


EAcceptance LLToolDragAndDrop::dad3dRezObjectOnLand(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	if (mSource == SOURCE_WORLD)
	{
		return dad3dRezFromObjectOnLand(obj, face, mask, drop);
	}

	LL_DEBUGS() << "LLToolDragAndDrop::dad3dRezObjectOnLand()" << LL_ENDL;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;

	LLVOAvatarSelf* my_avatar = gAgentAvatarp;
	if( !my_avatar || my_avatar->isWearingAttachment( item->getUUID() ) )
	{
		return ACCEPT_NO;
	}

	EAcceptance accept;
	bool remove_inventory;

	// Get initial settings based on shift key
	if (mask & MASK_SHIFT)
	{
		// For now, always make copy
		//accept = ACCEPT_YES_SINGLE;
		//remove_inventory = true;
		accept = ACCEPT_YES_COPY_SINGLE;
		remove_inventory = false;
	}
	else
	{
		accept = ACCEPT_YES_COPY_SINGLE;
		remove_inventory = false;
	}

	// check if the item can be copied. If not, send that to the sim
	// which will remove the inventory item.
	if(!item->getPermissions().allowCopyBy(gAgent.getID()))
	{
		accept = ACCEPT_YES_SINGLE;
		remove_inventory = true;
	}

	// Check if it's in the trash.
	const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
	if(gInventory.isObjectDescendentOf(item->getUUID(), trash_id))
	{
		accept = ACCEPT_YES_SINGLE;
	}

	if(drop)
	{
		dropObject(obj, true, false, remove_inventory);
	}

	return accept;
}

EAcceptance LLToolDragAndDrop::dad3dRezObjectOnObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	// handle objects coming from object inventory
	if (mSource == SOURCE_WORLD)
	{
		return dad3dRezFromObjectOnObject(obj, face, mask, drop);
	}

	LL_DEBUGS() << "LLToolDragAndDrop::dad3dRezObjectOnObject()" << LL_ENDL;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;
	LLVOAvatarSelf* my_avatar = gAgentAvatarp;
	if( !my_avatar || my_avatar->isWearingAttachment( item->getUUID() ) )
	{
		return ACCEPT_NO;
	}

	if((mask & MASK_CONTROL))
	{
		// *HACK: In order to resolve SL-22177, we need to block drags
		// from notecards and objects onto other objects.
		if(mSource == SOURCE_NOTECARD)
		{
			return ACCEPT_NO;
		}

		EAcceptance rv = willObjectAcceptInventory(obj, item);
		if(drop && (ACCEPT_YES_SINGLE <= rv))
		{
			dropInventory(obj, item, mSource, mSourceID);
		}
		return rv;
	}
	
	EAcceptance accept;
	bool remove_inventory;

	if (mask & MASK_SHIFT)
	{
		// For now, always make copy
		//accept = ACCEPT_YES_SINGLE;
		//remove_inventory = true;
		accept = ACCEPT_YES_COPY_SINGLE;
		remove_inventory = false;
	}
	else
	{
		accept = ACCEPT_YES_COPY_SINGLE;
		remove_inventory = false;
	}
	
	// check if the item can be copied. If not, send that to the sim
	// which will remove the inventory item.
	if(!item->getPermissions().allowCopyBy(gAgent.getID()))
	{
		accept = ACCEPT_YES_SINGLE;
		remove_inventory = true;
	}

	// Check if it's in the trash.
	const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
	if(gInventory.isObjectDescendentOf(item->getUUID(), trash_id))
	{
		accept = ACCEPT_YES_SINGLE;
		remove_inventory = true;
	}

	if(drop)
	{
		dropObject(obj, false, false, remove_inventory);
	}

	return accept;
}

EAcceptance LLToolDragAndDrop::dad3dRezScript(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dRezScript()" << LL_ENDL;

	// *HACK: In order to resolve SL-22177, we need to block drags
	// from notecards and objects onto other objects.
	if((SOURCE_WORLD == mSource) || (SOURCE_NOTECARD == mSource))
	{
		return ACCEPT_NO;
	}

	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;
	EAcceptance rv = willObjectAcceptInventory(obj, item);
	if(drop && (ACCEPT_YES_SINGLE <= rv))
	{
		// rez in the script active by default, rez in inactive if the
		// control key is being held down.
		bool active = ((mask & MASK_CONTROL) == 0);
	
		LLViewerObject* root_object = obj;
		if (obj && obj->getParent())
		{
			LLViewerObject* parent_obj = (LLViewerObject*)obj->getParent();
			if (!parent_obj->isAvatar())
			{
				root_object = parent_obj;
			}
		}

		dropScript(root_object, item, active, mSource, mSourceID);
	}	
	return rv;
}

EAcceptance LLToolDragAndDrop::dad3dApplyToObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop, EDragAndDropType cargo_type)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dApplyToObject()" << LL_ENDL;

	// *HACK: In order to resolve SL-22177, we need to block drags
	// from notecards and objects onto other objects.
	if((SOURCE_WORLD == mSource) || (SOURCE_NOTECARD == mSource))
	{
		return ACCEPT_NO;
	}
	
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;
    LLPermissions item_permissions = item->getPermissions();
	EAcceptance rv = willObjectAcceptInventory(obj, item);
	if((mask & MASK_CONTROL))
	{
		if((ACCEPT_YES_SINGLE <= rv) && drop)
		{
			dropInventory(obj, item, mSource, mSourceID);
		}
		return rv;
	}
	if(!obj->permModify())
	{
		return ACCEPT_NO_LOCKED;
	}

    if (cargo_type == DAD_TEXTURE && (mask & MASK_ALT) == 0)
    {
        bool has_non_pbr_faces = false;
        if ((mask & MASK_SHIFT))
        {
            S32 num_faces = obj->getNumTEs();
            for (S32 face = 0; face < num_faces; face++)
            {
                if (obj->getRenderMaterialID(face).isNull())
                {
                    has_non_pbr_faces = true;
                    break;
                }
            }
        }
        else
        {
            has_non_pbr_faces = obj->getRenderMaterialID(face).isNull();
        }

        if (!has_non_pbr_faces)
        {
            // Only pbr faces selected, texture will be added to an override
            // Overrides require textures to be copy and transfer free
            bool allow_adding_to_override = item_permissions.allowOperationBy(PERM_COPY, gAgent.getID());
            allow_adding_to_override &= item_permissions.allowOperationBy(PERM_TRANSFER, gAgent.getID());
            if (!allow_adding_to_override) return ACCEPT_NO;
        }
    }

	if(drop && (ACCEPT_YES_SINGLE <= rv))
	{
		if (cargo_type == DAD_TEXTURE)
		{
            bool all_faces = mask & MASK_SHIFT;
            bool remove_pbr = mask & MASK_ALT;
            if (item_permissions.allowOperationBy(PERM_COPY, gAgent.getID()))
            {
                dropTexture(obj, face, item, mSource, mSourceID, all_faces, remove_pbr);
            }
            else
            {
                ESource source = mSource;
                LLUUID source_id = mSourceID;
                LLNotificationsUtil::add("ApplyInventoryToObject", LLSD(), LLSD(), [obj, face, item, source, source_id, all_faces, remove_pbr](const LLSD& notification, const LLSD& response)
                                         {
                                             S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
                                             // if Cancel pressed
                                             if (option == 1)
                                             {
                                                 return;
                                             }
                                             dropTexture(obj, face, item, source, source_id, all_faces, remove_pbr);
                                         });
            }
		}
        else if (cargo_type == DAD_MATERIAL)
        {
            bool all_faces = mask & MASK_SHIFT;
            if (item->getPermissions().allowOperationBy(PERM_COPY, gAgent.getID()))
            {
                dropMaterial(obj, face, item, mSource, mSourceID, all_faces);
            }
            else
            {
                ESource source = mSource;
                LLUUID source_id = mSourceID;
                LLNotificationsUtil::add("ApplyInventoryToObject", LLSD(), LLSD(), [obj, face, item, source, source_id, all_faces](const LLSD& notification, const LLSD& response)
                                         {
                                             S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
                                             // if Cancel pressed
                                             if (option == 1)
                                             {
                                                 return;
                                             }
                                             dropMaterial(obj, face, item, source, source_id, all_faces);
                                         });
            }
        }
		else if (cargo_type == DAD_MESH)
		{
			dropMesh(obj, item, mSource, mSourceID);
		}
		else
		{
			LL_WARNS() << "unsupported asset type" << LL_ENDL;
		}
		
		// VEFFECT: SetTexture
		LLHUDEffectSpiral *effectp = (LLHUDEffectSpiral *)LLHUDManager::getInstance()->createViewerEffect(LLHUDObject::LL_HUD_EFFECT_BEAM, true);
		effectp->setSourceObject(gAgentAvatarp);
		effectp->setTargetObject(obj);
		effectp->setDuration(LL_HUD_DUR_SHORT);
		effectp->setColor(LLColor4U(gAgent.getEffectColor()));
	}

	// enable multi-drop, although last texture will win
	return ACCEPT_YES_MULTI;
}


EAcceptance LLToolDragAndDrop::dad3dTextureObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	return dad3dApplyToObject(obj, face, mask, drop, DAD_TEXTURE);
}

EAcceptance LLToolDragAndDrop::dad3dMaterialObject(
    LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
    return dad3dApplyToObject(obj, face, mask, drop, DAD_MATERIAL);
}

EAcceptance LLToolDragAndDrop::dad3dMeshObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	return dad3dApplyToObject(obj, face, mask, drop, DAD_MESH);
}


/*
EAcceptance LLToolDragAndDrop::dad3dTextureSelf(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dTextureAvatar()" << LL_ENDL;
	if(drop)
	{
		if( !(mask & MASK_SHIFT) )
		{
			dropTextureOneFaceAvatar( (LLVOAvatar*)obj, face, (LLInventoryItem*)mCargoData);
		}
	}
	return (mask & MASK_SHIFT) ? ACCEPT_NO : ACCEPT_YES_SINGLE;
}
*/

EAcceptance LLToolDragAndDrop::dad3dWearItem(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dWearItem()" << LL_ENDL;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;

	if(mSource == SOURCE_AGENT || mSource == SOURCE_LIBRARY)
	{
		// it's in the agent inventory
		const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
		if( gInventory.isObjectDescendentOf( item->getUUID(), trash_id ) )
		{
			return ACCEPT_NO;
		}

		if( drop )
		{
			// TODO: investigate wearables may not be loaded at this point EXT-8231

			LLAppearanceMgr::instance().wearItemOnAvatar(item->getUUID(),true, !(mask & MASK_CONTROL));
		}
		return ACCEPT_YES_MULTI;
	}
	else
	{
		// TODO: copy/move item to avatar's inventory and then wear it.
		return ACCEPT_NO;
	}
}

EAcceptance LLToolDragAndDrop::dad3dActivateGesture(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dActivateGesture()" << LL_ENDL;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;

	if(mSource == SOURCE_AGENT || mSource == SOURCE_LIBRARY)
	{
		// it's in the agent inventory
		const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
		if( gInventory.isObjectDescendentOf( item->getUUID(), trash_id ) )
		{
			return ACCEPT_NO;
		}

		if( drop )
		{
			LLUUID item_id;
			if(mSource == SOURCE_LIBRARY)
			{
				// create item based on that one, and put it on if that
				// was a success.
				LLPointer<LLInventoryCallback> cb = new LLBoostFuncInventoryCallback(activate_gesture_cb);
				copy_inventory_item(
					gAgent.getID(),
					item->getPermissions().getOwner(),
					item->getUUID(),
					LLUUID::null,
					std::string(),
					cb);
			}
			else
			{
				LLGestureMgr::instance().activateGesture(item->getUUID());
				gInventory.updateItem(item);
				gInventory.notifyObservers();
			}
		}
		return ACCEPT_YES_MULTI;
	}
	else
	{
		return ACCEPT_NO;
	}
}

EAcceptance LLToolDragAndDrop::dad3dWearCategory(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dWearCategory()" << LL_ENDL;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* category;
	locateInventory(item, category);
	if(!category) return ACCEPT_NO;

	if (drop)
	{
		// TODO: investigate wearables may not be loaded at this point EXT-8231
	}

	U32 max_items = gSavedSettings.getU32("WearFolderLimit");
	LLInventoryModel::cat_array_t cats;
	LLInventoryModel::item_array_t items;
	LLFindWearablesEx not_worn(/*is_worn=*/ false, /*include_body_parts=*/ false);
	gInventory.collectDescendentsIf(category->getUUID(),
		cats,
		items,
		LLInventoryModel::EXCLUDE_TRASH,
		not_worn);
	if (items.size() > max_items)
	{
		LLStringUtil::format_map_t args;
		args["AMOUNT"] = llformat("%d", max_items);
		mCustomMsg = LLTrans::getString("TooltipTooManyWearables",args);
		return ACCEPT_NO_CUSTOM;
	}

	if (mSource == SOURCE_AGENT)
	{
		const LLUUID trash_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH);
		if (gInventory.isObjectDescendentOf(category->getUUID(), trash_id))
		{
			return ACCEPT_NO;
		}

		const LLUUID &outbox_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_OUTBOX);
		if (outbox_id.notNull() && gInventory.isObjectDescendentOf(category->getUUID(), outbox_id))
		{
			// Legacy
			return ACCEPT_NO;
		}

		if (drop)
		{
			LLAppearanceMgr::instance().wearInventoryCategory(category, false, mask & MASK_SHIFT);
		}

		return ACCEPT_YES_MULTI;
	}

	if (mSource == SOURCE_LIBRARY)
	{
		if (drop)
		{
			LLAppearanceMgr::instance().wearInventoryCategory(category, true, false);
		}

		return ACCEPT_YES_MULTI;
	}

	// TODO: copy/move category to avatar's inventory and then wear it.
	return ACCEPT_NO;
}


EAcceptance LLToolDragAndDrop::dad3dUpdateInventory(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dadUpdateInventory()" << LL_ENDL;

	// *HACK: In order to resolve SL-22177, we need to block drags
	// from notecards and objects onto other objects.
	if ((SOURCE_WORLD == mSource) || (SOURCE_NOTECARD == mSource))
		return ACCEPT_NO;

	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished())
		return ACCEPT_NO;

	LLViewerObject* root_object = obj;
	if (obj && obj->getParent())
	{
		LLViewerObject* parent_obj = (LLViewerObject*)obj->getParent();
		if (!parent_obj->isAvatar())
		{
			root_object = parent_obj;
		}
	}

	EAcceptance rv = willObjectAcceptInventory(root_object, item);
	if (root_object && drop && (ACCEPT_YES_COPY_SINGLE <= rv))
	{
		dropInventory(root_object, item, mSource, mSourceID);
	}

	return rv;
}

bool LLToolDragAndDrop::dadUpdateInventory(LLViewerObject* obj, bool drop)
{
	EAcceptance rv = dad3dUpdateInventory(obj, -1, MASK_NONE, drop);
	return rv >= ACCEPT_YES_COPY_SINGLE;
}

EAcceptance LLToolDragAndDrop::dad3dUpdateInventoryCategory(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dUpdateInventoryCategory()" << LL_ENDL;
	if (obj == NULL)
	{
		LL_WARNS() << "obj is NULL; aborting func with ACCEPT_NO" << LL_ENDL;
		return ACCEPT_NO;
	}

	if ((mSource != SOURCE_AGENT) && (mSource != SOURCE_LIBRARY))
	{
		return ACCEPT_NO;
	}
	if (obj->isAttachment())
	{
		return ACCEPT_NO_LOCKED;
	}

	LLViewerInventoryItem* item = NULL;
	LLViewerInventoryCategory* cat = NULL;
	locateInventory(item, cat);
	if (!cat) 
	{
		return ACCEPT_NO;
	}

	// Find all the items in the category
	LLDroppableItem droppable(!obj->permYouOwner());
	LLInventoryModel::cat_array_t cats;
	LLInventoryModel::item_array_t items;
	gInventory.collectDescendentsIf(cat->getUUID(),
					cats,
					items,
					LLInventoryModel::EXCLUDE_TRASH,
					droppable);
	cats.push_back(cat);
 	if (droppable.countNoCopy() > 0)
 	{
 		LL_WARNS() << "*** Need to confirm this step" << LL_ENDL;
 	}
	LLViewerObject* root_object = obj;
	if (obj->getParent())
	{
		LLViewerObject* parent_obj = (LLViewerObject*)obj->getParent();
		if (!parent_obj->isAvatar())
		{
			root_object = parent_obj;
		}
	}

	EAcceptance rv = ACCEPT_NO;

	// Check for accept
	for (LLInventoryModel::cat_array_t::const_iterator cat_iter = cats.begin();
		 cat_iter != cats.end();
		 ++cat_iter)
	{
		const LLViewerInventoryCategory *cat = (*cat_iter);
		rv = gInventory.isCategoryComplete(cat->getUUID()) ? ACCEPT_YES_MULTI : ACCEPT_NO;
		if(rv < ACCEPT_YES_SINGLE)
		{
			LL_DEBUGS() << "Category " << cat->getUUID() << "is not complete." << LL_ENDL;
			break;
		}
	}
	if (ACCEPT_YES_COPY_SINGLE <= rv)
	{
		for (LLInventoryModel::item_array_t::const_iterator item_iter = items.begin();
			 item_iter != items.end();
			 ++item_iter)
		{
			LLViewerInventoryItem *item = (*item_iter);
			/*
			// Pass the base objects, not the links.
			if (item && item->getIsLinkType())
			{
				item = item->getLinkedItem();
				(*item_iter) = item;
			}
			*/
			rv = willObjectAcceptInventory(root_object, item, DAD_CATEGORY);
			if (rv < ACCEPT_YES_COPY_SINGLE)
			{
				LL_DEBUGS() << "Object will not accept " << item->getUUID() << LL_ENDL;
				break;
			}
		}
	}

	// If every item is accepted, send it on
	if (drop && (ACCEPT_YES_COPY_SINGLE <= rv))
	{
		uuid_vec_t ids;
		for (LLInventoryModel::item_array_t::const_iterator item_iter = items.begin();
			 item_iter != items.end();
			 ++item_iter)
		{
			const LLViewerInventoryItem *item = (*item_iter);
			ids.push_back(item->getUUID());
		}
		LLCategoryDropObserver* dropper = new LLCategoryDropObserver(ids, obj->getID(), mSource);
		dropper->startFetch();
		if (dropper->isFinished())
		{
			dropper->done();
		}
		else
		{
			gInventory.addObserver(dropper);
		}
	}
	return rv;
}


EAcceptance LLToolDragAndDrop::dad3dRezCategoryOnObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	if ((mask & MASK_CONTROL))
	{
		return dad3dUpdateInventoryCategory(obj, face, mask, drop);
	}
	else
	{
		return ACCEPT_NO;
	}
}


bool LLToolDragAndDrop::dadUpdateInventoryCategory(LLViewerObject* obj,
												   bool drop)
{
	EAcceptance rv = dad3dUpdateInventoryCategory(obj, -1, MASK_NONE, drop);
	return (rv >= ACCEPT_YES_COPY_SINGLE);
}

EAcceptance LLToolDragAndDrop::dad3dGiveInventoryObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dGiveInventoryObject()" << LL_ENDL;

	// item has to be in agent inventory.
	if(mSource != SOURCE_AGENT) return ACCEPT_NO;

	// find the item now.
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;
	if(!item->getPermissions().allowOperationBy(PERM_TRANSFER, gAgent.getID()))
	{
		// cannot give away no-transfer objects
		return ACCEPT_NO;
	}
	LLVOAvatarSelf* avatar = gAgentAvatarp;
	if(avatar && avatar->isWearingAttachment( item->getUUID() ) )
	{
		// You can't give objects that are attached to you
		return ACCEPT_NO;
	}
	if( obj && avatar )
	{
		if(drop)
		{
			LLGiveInventory::doGiveInventoryItem(obj->getID(), item );
		}
		// *TODO: deal with all the issues surrounding multi-object
		// inventory transfers.
		return ACCEPT_YES_SINGLE;
	}
	return ACCEPT_NO;
}


EAcceptance LLToolDragAndDrop::dad3dGiveInventory(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dGiveInventory()" << LL_ENDL;
	// item has to be in agent inventory.
	if(mSource != SOURCE_AGENT) return ACCEPT_NO;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;
	if (!LLGiveInventory::isInventoryGiveAcceptable(item))
	{
		return ACCEPT_NO;
	}
	if (drop && obj)
	{
		LLGiveInventory::doGiveInventoryItem(obj->getID(), item);
	}
	// *TODO: deal with all the issues surrounding multi-object
	// inventory transfers.
	return ACCEPT_YES_SINGLE;
}

EAcceptance LLToolDragAndDrop::dad3dGiveInventoryCategory(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dGiveInventoryCategory()" << LL_ENDL;
	if(drop && obj)
	{
		LLViewerInventoryItem* item;
		LLViewerInventoryCategory* cat;
		locateInventory(item, cat);
		if(!cat) return ACCEPT_NO;
		LLGiveInventory::doGiveInventoryCategory(obj->getID(), cat);
	}
	// *TODO: deal with all the issues surrounding multi-object
	// inventory transfers.
	return ACCEPT_YES_SINGLE;
}


EAcceptance LLToolDragAndDrop::dad3dRezFromObjectOnLand(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dRezFromObjectOnLand()" << LL_ENDL;
	LLViewerInventoryItem* item = NULL;
	LLViewerInventoryCategory* cat = NULL;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;

	if(!gAgent.allowOperation(PERM_COPY, item->getPermissions())
		|| !item->getPermissions().allowTransferTo(LLUUID::null))
	{
		return ACCEPT_NO_LOCKED;
	}
	if(drop)
	{
		dropObject(obj, true, true, false);
	}
	return ACCEPT_YES_SINGLE;
}

EAcceptance LLToolDragAndDrop::dad3dRezFromObjectOnObject(
	LLViewerObject* obj, S32 face, MASK mask, bool drop)
{
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dRezFromObjectOnObject()" << LL_ENDL;
	LLViewerInventoryItem* item;
	LLViewerInventoryCategory* cat;
	locateInventory(item, cat);
	if (!item || !item->isFinished()) return ACCEPT_NO;
	if((mask & MASK_CONTROL))
	{
		// *HACK: In order to resolve SL-22177, we need to block drags
		// from notecards and objects onto other objects.
		return ACCEPT_NO;

		// *HACK: uncomment this when appropriate
		//EAcceptance rv = willObjectAcceptInventory(obj, item);
		//if(drop && (ACCEPT_YES_SINGLE <= rv))
		//{
		//	dropInventory(obj, item, mSource, mSourceID);
		//}
		//return rv;
	}
	if(!item->getPermissions().allowCopyBy(gAgent.getID(),
										   gAgent.getGroupID())
	   || !item->getPermissions().allowTransferTo(LLUUID::null))
	{
		return ACCEPT_NO_LOCKED;
	}
	if(drop)
	{
		dropObject(obj, false, true, false);
	}
	return ACCEPT_YES_SINGLE;
}

EAcceptance LLToolDragAndDrop::dad3dCategoryOnLand(
	LLViewerObject *obj, S32 face, MASK mask, bool drop)
{
	return ACCEPT_NO;
	/*
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dCategoryOnLand()" << LL_ENDL;
	LLInventoryItem* item;
	LLInventoryCategory* cat;
	locateInventory(item, cat);
	if(!cat) return ACCEPT_NO;
	EAcceptance rv = ACCEPT_NO;

	// find all the items in the category
	LLViewerInventoryCategory::cat_array_t cats;
	LLViewerInventoryItem::item_array_t items;
	LLDropCopyableItems droppable;
	gInventory.collectDescendentsIf(cat->getUUID(),
									cats,
									items,
									LLInventoryModel::EXCLUDE_TRASH,
									droppable);
	if(items.size() > 0)
	{
		rv = ACCEPT_YES_SINGLE;
	}
	if((rv >= ACCEPT_YES_COPY_SINGLE) && drop)
	{
		createContainer(items, cat->getName());
		return ACCEPT_NO;
	}
	return rv;
	*/
}


// This is based on ALOT of copied, special-cased code
// This shortcuts alot of steps to make a basic object
// w/ an inventory and a special permissions set
EAcceptance LLToolDragAndDrop::dad3dAssetOnLand(
	LLViewerObject *obj, S32 face, MASK mask, bool drop)
{
	return ACCEPT_NO;
	/*
	LL_DEBUGS() << "LLToolDragAndDrop::dad3dAssetOnLand()" << LL_ENDL;
	LLViewerInventoryCategory::cat_array_t cats;
	LLViewerInventoryItem::item_array_t items;
	LLViewerInventoryItem::item_array_t copyable_items;
	locateMultipleInventory(items, cats);
	if(!items.size()) return ACCEPT_NO;
	EAcceptance rv = ACCEPT_NO;
	for (S32 i = 0; i < items.size(); i++)
	{
		LLInventoryItem* item = items[i];
		if(item->getPermissions().allowCopyBy(gAgent.getID()))
		{
			copyable_items.push_back(item);
			rv = ACCEPT_YES_SINGLE;
		}
	}

	if((rv >= ACCEPT_YES_COPY_SINGLE) && drop)
	{
		createContainer(copyable_items, NULL);
	}

	return rv;
	*/
}

LLInventoryObject* LLToolDragAndDrop::locateInventory(
	LLViewerInventoryItem*& item,
	LLViewerInventoryCategory*& cat)
{
	item = NULL;
	cat = NULL;

	if (mCargoIDs.empty()
		|| (mSource == SOURCE_PEOPLE)) ///< There is no inventory item for people drag and drop.
	{
		return NULL;
	}

	if((mSource == SOURCE_AGENT) || (mSource == SOURCE_LIBRARY))
	{
		// The object should be in user inventory.
		item = (LLViewerInventoryItem*)gInventory.getItem(mCargoIDs[mCurItemIndex]);
		cat = (LLViewerInventoryCategory*)gInventory.getCategory(mCargoIDs[mCurItemIndex]);
	}
	else if(mSource == SOURCE_WORLD)
	{
		// This object is in some task inventory somewhere.
		LLViewerObject* obj = gObjectList.findObject(mSourceID);
		if(obj)
		{
			if((mCargoTypes[mCurItemIndex] == DAD_CATEGORY)
			   || (mCargoTypes[mCurItemIndex] == DAD_ROOT_CATEGORY))
			{
				cat = (LLViewerInventoryCategory*)obj->getInventoryObject(mCargoIDs[mCurItemIndex]);
			}
			else
			{
			   item = (LLViewerInventoryItem*)obj->getInventoryObject(mCargoIDs[mCurItemIndex]);
			}
		}
	}
	else if(mSource == SOURCE_NOTECARD)
	{
		LLPreviewNotecard* preview = LLFloaterReg::findTypedInstance<LLPreviewNotecard>("preview_notecard", mSourceID);
		if(preview)
		{
			item = (LLViewerInventoryItem*)preview->getDragItem();
		}
	}
	else if(mSource == SOURCE_VIEWER)
	{
		item = (LLViewerInventoryItem*)gToolBarView->getDragItem();
	}

	if(item) return item;
	if(cat) return cat;
	return NULL;
}

/*
LLInventoryObject* LLToolDragAndDrop::locateMultipleInventory(LLViewerInventoryCategory::cat_array_t& cats,
															  LLViewerInventoryItem::item_array_t& items)
{
	if(mCargoIDs.size() == 0) return NULL;
	if((mSource == SOURCE_AGENT) || (mSource == SOURCE_LIBRARY))
	{
		// The object should be in user inventory.
		for (S32 i = 0; i < mCargoIDs.size(); i++)
		{
			LLInventoryItem* item = gInventory.getItem(mCargoIDs[i]);
			if (item)
			{
				items.push_back(item);
			}
			LLInventoryCategory* category = gInventory.getCategory(mCargoIDs[i]);
			if (category)
			{
				cats.push_back(category);
			}
		}
	}
	else if(mSource == SOURCE_WORLD)
	{
		// This object is in some task inventory somewhere.
		LLViewerObject* obj = gObjectList.findObject(mSourceID);
		if(obj)
		{
			if((mCargoType == DAD_CATEGORY)
			   || (mCargoType == DAD_ROOT_CATEGORY))
			{
				// The object should be in user inventory.
				for (S32 i = 0; i < mCargoIDs.size(); i++)
				{
					LLInventoryCategory* category = (LLInventoryCategory*)obj->getInventoryObject(mCargoIDs[i]);
					if (category)
					{
						cats.push_back(category);
					}
				}
			}
			else
			{
				for (S32 i = 0; i < mCargoIDs.size(); i++)
				{
					LLInventoryItem* item = (LLInventoryItem*)obj->getInventoryObject(mCargoIDs[i]);
					if (item)
					{
						items.push_back(item);
					}
				}
			}
		}
	}
	else if(mSource == SOURCE_NOTECARD)
	{
		LLPreviewNotecard* card;
		card = (LLPreviewNotecard*)LLPreview::find(mSourceID);
		if(card)
		{
			items.push_back((LLInventoryItem*)card->getDragItem());
		}
	}
	if(items.size()) return items[0];
	if(cats.size()) return cats[0];
	return NULL;
}
*/

// void LLToolDragAndDrop::createContainer(LLViewerInventoryItem::item_array_t &items, const char* preferred_name )
// {
// 	LL_WARNS() << "LLToolDragAndDrop::createContainer()" << LL_ENDL;
// 	return;
// }


// utility functions

void pack_permissions_slam(LLMessageSystem* msg, U32 flags, const LLPermissions& perms)
{
	// CRUFT -- the server no longer pays attention to this data
	U32 group_mask		= perms.getMaskGroup();
	U32 everyone_mask	= perms.getMaskEveryone();
	U32 next_owner_mask	= perms.getMaskNextOwner();
	
	msg->addU32Fast(_PREHASH_ItemFlags, flags);
	msg->addU32Fast(_PREHASH_GroupMask, group_mask);
	msg->addU32Fast(_PREHASH_EveryoneMask, everyone_mask);
	msg->addU32Fast(_PREHASH_NextOwnerMask, next_owner_mask);
}