/** 
* @file llfolderviewitem.cpp
* @brief Items and folders that can appear in a hierarchical folder view
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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 "llfolderviewitem.h"

// viewer includes
#include "llfolderview.h"		// Items depend extensively on LLFolderViews
#include "llfoldervieweventlistener.h"
#include "llviewerfoldertype.h"
#include "llinventorybridge.h"	// for LLItemBridge in LLInventorySort::operator()
#include "llinventoryfilter.h"
#include "llinventoryfunctions.h"
#include "llinventorymodelbackgroundfetch.h"
#include "llpanel.h"
#include "llviewercontrol.h"	// gSavedSettings
#include "llviewerwindow.h"		// Argh, only for setCursor()

// linden library includes
#include "llfocusmgr.h"		// gFocusMgr
#include "lltrans.h"

///----------------------------------------------------------------------------
/// Class LLFolderViewItem
///----------------------------------------------------------------------------

static LLDefaultChildRegistry::Register<LLFolderViewItem> r("folder_view_item");

// statics 
std::map<U8, LLFontGL*> LLFolderViewItem::sFonts; // map of styles to fonts

// only integers can be initialized in header
const F32 LLFolderViewItem::FOLDER_CLOSE_TIME_CONSTANT = 0.02f;
const F32 LLFolderViewItem::FOLDER_OPEN_TIME_CONSTANT = 0.03f;

const LLColor4U DEFAULT_WHITE(255, 255, 255);


//static
LLFontGL* LLFolderViewItem::getLabelFontForStyle(U8 style)
{
	LLFontGL* rtn = sFonts[style];
	if (!rtn) // grab label font with this style, lazily
	{
		LLFontDescriptor labelfontdesc("SansSerif", "Small", style);
		rtn = LLFontGL::getFont(labelfontdesc);
		if (!rtn)
		{
			rtn = LLFontGL::getFontDefault();
		}
		sFonts[style] = rtn;
	}
	return rtn;
}

//static
void LLFolderViewItem::initClass()
{
}

//static
void LLFolderViewItem::cleanupClass()
{
	sFonts.clear();
}


// NOTE: Optimize this, we call it a *lot* when opening a large inventory
LLFolderViewItem::Params::Params()
:	icon(),
	icon_open(),
	icon_overlay(),
	root(),
	listener(),
	folder_arrow_image("folder_arrow_image"),
	folder_indentation("folder_indentation"),
	selection_image("selection_image"),
	item_height("item_height"),
	item_top_pad("item_top_pad"),
	creation_date()
{}

// Default constructor
LLFolderViewItem::LLFolderViewItem(const LLFolderViewItem::Params& p)
:	LLView(p),
	mLabelWidth(0),
	mLabelWidthDirty(false),
	mParentFolder( NULL ),
	mIsSelected( FALSE ),
	mIsCurSelection( FALSE ),
	mSelectPending(FALSE),
	mLabelStyle( LLFontGL::NORMAL ),
	mHasVisibleChildren(FALSE),
	mIndentation(0),
	mItemHeight(p.item_height),
	mPassedFilter(FALSE),
	mLastFilterGeneration(-1),
	mStringMatchOffset(std::string::npos),
	mControlLabelRotation(0.f),
	mDragAndDropTarget(FALSE),
	mIsLoading(FALSE),
	mLabel(p.name),
	mRoot(p.root),
	mCreationDate(p.creation_date),
	mIcon(p.icon),
	mIconOpen(p.icon_open),
	mIconOverlay(p.icon_overlay),
	mListener(p.listener),
	mShowLoadStatus(false),
	mIsMouseOverTitle(false)
{
}

BOOL LLFolderViewItem::postBuild()
{
	refresh();
	return TRUE;
}

// Destroys the object
LLFolderViewItem::~LLFolderViewItem( void )
{
	delete mListener;
	mListener = NULL;
}

LLFolderView* LLFolderViewItem::getRoot()
{
	return mRoot;
}

// Returns true if this object is a child (or grandchild, etc.) of potential_ancestor.
BOOL LLFolderViewItem::isDescendantOf( const LLFolderViewFolder* potential_ancestor )
{
	LLFolderViewItem* root = this;
	while( root->mParentFolder )
	{
		if( root->mParentFolder == potential_ancestor )
		{
			return TRUE;
		}
		root = root->mParentFolder;
	}
	return FALSE;
}

LLFolderViewItem* LLFolderViewItem::getNextOpenNode(BOOL include_children)
{
	if (!mParentFolder)
	{
		return NULL;
	}

	LLFolderViewItem* itemp = mParentFolder->getNextFromChild( this, include_children );
	while(itemp && !itemp->getVisible())
	{
		LLFolderViewItem* next_itemp = itemp->mParentFolder->getNextFromChild( itemp, include_children );
		if (itemp == next_itemp) 
		{
			// hit last item
			return itemp->getVisible() ? itemp : this;
		}
		itemp = next_itemp;
	}

	return itemp;
}

LLFolderViewItem* LLFolderViewItem::getPreviousOpenNode(BOOL include_children)
{
	if (!mParentFolder)
	{
		return NULL;
	}

	LLFolderViewItem* itemp = mParentFolder->getPreviousFromChild( this, include_children );

	// Skip over items that are invisible or are hidden from the UI.
	while(itemp && !itemp->getVisible())
	{
		LLFolderViewItem* next_itemp = itemp->mParentFolder->getPreviousFromChild( itemp, include_children );
		if (itemp == next_itemp) 
		{
			// hit first item
			return itemp->getVisible() ? itemp : this;
		}
		itemp = next_itemp;
	}

	return itemp;
}

// is this item something we think we should be showing?
// for example, if we haven't gotten around to filtering it yet, then the answer is yes
// until we find out otherwise
BOOL LLFolderViewItem::potentiallyVisible()
{
	// we haven't been checked against min required filter
	// or we have and we passed
	return getLastFilterGeneration() < getRoot()->getFilter()->getMinRequiredGeneration() || getFiltered();
}

BOOL LLFolderViewItem::getFiltered() 
{ 
	return mPassedFilter && mLastFilterGeneration >= getRoot()->getFilter()->getMinRequiredGeneration(); 
}

BOOL LLFolderViewItem::getFiltered(S32 filter_generation) 
{
	return mPassedFilter && mLastFilterGeneration >= filter_generation;
}

void LLFolderViewItem::setFiltered(BOOL filtered, S32 filter_generation)
{
	mPassedFilter = filtered;
	mLastFilterGeneration = filter_generation;
}

void LLFolderViewItem::setIcon(LLUIImagePtr icon)
{
	mIcon = icon;
}

// refresh information from the listener
void LLFolderViewItem::refreshFromListener()
{
	if(mListener)
	{
		mLabel = mListener->getDisplayName();
		LLFolderType::EType preferred_type = mListener->getPreferredType();

		// *TODO: to be removed when database supports multi language. This is a
		// temporary attempt to display the inventory folder in the user locale.
		// mantipov: *NOTE: be sure this code is synchronized with LLFriendCardsManager::findChildFolderUUID
		//		it uses the same way to find localized string

		// HACK: EXT - 6028 ([HARD CODED]? Inventory > Library > "Accessories" folder)
		// Translation of Accessories folder in Library inventory folder
		bool accessories = false;
		if(mLabel == std::string("Accessories"))
		{
			//To ensure that Accessories folder is in Library we have to check its parent folder.
			//Due to parent LLFolderViewFloder is not set to this item yet we have to check its parent via Inventory Model
			LLInventoryCategory* cat = gInventory.getCategory(mListener->getUUID());
			if(cat)
			{
				const LLUUID& parent_folder_id = cat->getParentUUID();
				accessories = (parent_folder_id == gInventory.getLibraryRootFolderID());
			}
		}

		//"Accessories" inventory category has folder type FT_NONE. So, this folder
		//can not be detected as protected with LLFolderType::lookupIsProtectedType
		if (accessories || LLFolderType::lookupIsProtectedType(preferred_type))
		{
			LLTrans::findString(mLabel, "InvFolder " + mLabel);
		};

		setToolTip(mLabel);
		setIcon(mListener->getIcon());
		time_t creation_date = mListener->getCreationDate();
		if ((creation_date > 0) && (mCreationDate != creation_date))
		{
			setCreationDate(creation_date);
			dirtyFilter();
		}
		if (mRoot->useLabelSuffix())
		{
			mLabelStyle = mListener->getLabelStyle();
			mLabelSuffix = mListener->getLabelSuffix();
		}
	}
}

void LLFolderViewItem::refresh()
{
	refreshFromListener();

	std::string searchable_label(mLabel);
	searchable_label.append(mLabelSuffix);
	LLStringUtil::toUpper(searchable_label);

	if (mSearchableLabel.compare(searchable_label))
	{
		mSearchableLabel.assign(searchable_label);
		dirtyFilter();
		// some part of label has changed, so overall width has potentially changed, and sort order too
		if (mParentFolder)
		{
			mParentFolder->requestSort();
			mParentFolder->requestArrange();
		}
	}

	mLabelWidthDirty = true;
}

void LLFolderViewItem::applyListenerFunctorRecursively(LLFolderViewListenerFunctor& functor)
{
	functor(mListener);
}

// This function is called when items are added or view filters change. It's
// implemented here but called by derived classes when folding the
// views.
void LLFolderViewItem::filterFromRoot( void )
{
	LLFolderViewItem* root = getRoot();

	root->filter(*((LLFolderView*)root)->getFilter());
}

// This function is called when the folder view is dirty. It's
// implemented here but called by derived classes when folding the
// views.
void LLFolderViewItem::arrangeFromRoot()
{
	LLFolderViewItem* root = getRoot();

	S32 height = 0;
	S32 width = 0;
	S32 total_height = root->arrange( &width, &height, 0 );

	LLSD params;
	params["action"] = "size_changes";
	params["height"] = total_height;
	getParent()->notifyParent(params);
}

// Utility function for LLFolderView
void LLFolderViewItem::arrangeAndSet(BOOL set_selection,
									 BOOL take_keyboard_focus)
{
	LLFolderView* root = getRoot();
	if (getParentFolder())
	{
	getParentFolder()->requestArrange();
	}
	if(set_selection)
	{
		setSelectionFromRoot(this, TRUE, take_keyboard_focus);
		if(root)
		{
			root->scrollToShowSelection();
		}
	}		
}

// This function clears the currently selected item, and records the
// specified selected item appropriately for display and use in the
// UI. If open is TRUE, then folders are opened up along the way to
// the selection.
void LLFolderViewItem::setSelectionFromRoot(LLFolderViewItem* selection,
											BOOL openitem,
											BOOL take_keyboard_focus)
{
	getRoot()->setSelection(selection, openitem, take_keyboard_focus);
}

// helper function to change the selection from the root.
void LLFolderViewItem::changeSelectionFromRoot(LLFolderViewItem* selection, BOOL selected)
{
	getRoot()->changeSelection(selection, selected);
}

void LLFolderViewItem::extendSelectionFromRoot(LLFolderViewItem* selection)
{
	LLDynamicArray<LLFolderViewItem*> selected_items;

	getRoot()->extendSelection(selection, NULL, selected_items);
}

std::set<LLUUID> LLFolderViewItem::getSelectionList() const
{
	std::set<LLUUID> selection;
	return selection;
}

EInventorySortGroup LLFolderViewItem::getSortGroup()  const
{ 
	return SG_ITEM; 
}

// addToFolder() returns TRUE if it succeeds. FALSE otherwise
BOOL LLFolderViewItem::addToFolder(LLFolderViewFolder* folder, LLFolderView* root)
{
	if (!folder)
	{
		return FALSE;
	}
	mParentFolder = folder;
	root->addItemID(getListener()->getUUID(), this);
	return folder->addItem(this);
}


// Finds width and height of this object and it's children.  Also
// makes sure that this view and it's children are the right size.
S32 LLFolderViewItem::arrange( S32* width, S32* height, S32 filter_generation)
{
	const Params& p = LLUICtrlFactory::getDefaultParams<LLFolderViewItem>();
	S32 indentation = p.folder_indentation();
	// Only indent deeper items in hierarchy
	mIndentation = (getParentFolder() 
					&& getParentFolder()->getParentFolder() )
		? mParentFolder->getIndentation() + indentation
		: 0;
	if (mLabelWidthDirty)
	{
		mLabelWidth = ARROW_SIZE + TEXT_PAD + ICON_WIDTH + ICON_PAD + getLabelFontForStyle(mLabelStyle)->getWidth(mSearchableLabel); 
		mLabelWidthDirty = false;
	}

	*width = llmax(*width, mLabelWidth + mIndentation); 

	// determine if we need to use ellipses to avoid horizontal scroll. EXT-719
	bool use_ellipses = getRoot()->getUseEllipses();
	if (use_ellipses)
	{
		// limit to set rect to avoid horizontal scrollbar
		*width = llmin(*width, getRoot()->getRect().getWidth());
	}
	*height = getItemHeight();
	return *height;
}

S32 LLFolderViewItem::getItemHeight()
{
	return mItemHeight;
}

void LLFolderViewItem::filter( LLInventoryFilter& filter)
{
	const BOOL previous_passed_filter = mPassedFilter;
	const BOOL passed_filter = filter.check(this);

	// If our visibility will change as a result of this filter, then
	// we need to be rearranged in our parent folder
	if (mParentFolder)
	{
		if (getVisible() != passed_filter
			||	previous_passed_filter != passed_filter )
			mParentFolder->requestArrange();
	}

	setFiltered(passed_filter, filter.getCurrentGeneration());
	mStringMatchOffset = filter.getStringMatchOffset();
	filter.decrementFilterCount();

	if (getRoot()->getDebugFilters())
	{
		mStatusText = llformat("%d", mLastFilterGeneration);
	}
}

void LLFolderViewItem::dirtyFilter()
{
	mLastFilterGeneration = -1;
	// bubble up dirty flag all the way to root
	if (getParentFolder())
	{
		getParentFolder()->setCompletedFilterGeneration(-1, TRUE);
	}
}

// *TODO: This can be optimized a lot by simply recording that it is
// selected in the appropriate places, and assuming that set selection
// means 'deselect' for a leaf item. Do this optimization after
// multiple selection is implemented to make sure it all plays nice
// together.
BOOL LLFolderViewItem::setSelection(LLFolderViewItem* selection, BOOL openitem, BOOL take_keyboard_focus)
{
	if (selection == this && !mIsSelected)
	{
		selectItem();
		if (mListener)
		{
			mListener->selectItem();
		}
	}
	else if (mIsSelected)	// Deselect everything else.
	{
		deselectItem();
	}
	return mIsSelected;
}

BOOL LLFolderViewItem::changeSelection(LLFolderViewItem* selection, BOOL selected)
{
	if (selection == this && mIsSelected != selected)
	{
		if (mIsSelected)
		{
			deselectItem();
		}
		else
		{
			selectItem();
		}
		if (mListener)
		{
			mListener->selectItem();
		}
		return TRUE;
	}
	return FALSE;
}

void LLFolderViewItem::deselectItem(void)
{
	llassert(mIsSelected);

	mIsSelected = FALSE;

	// Update ancestors' count of selected descendents.
	LLFolderViewFolder* parent_folder = getParentFolder();
	if (parent_folder)
	{
		parent_folder->recursiveIncrementNumDescendantsSelected(-1);
	}
}

void LLFolderViewItem::selectItem(void)
{
	llassert(!mIsSelected);

	mIsSelected = TRUE;

	// Update ancestors' count of selected descendents.
	LLFolderViewFolder* parent_folder = getParentFolder();
	if (parent_folder)
	{
		parent_folder->recursiveIncrementNumDescendantsSelected(1);
	}
}

BOOL LLFolderViewItem::isMovable()
{
	if( mListener )
	{
		return mListener->isItemMovable();
	}
	else
	{
		return TRUE;
	}
}

BOOL LLFolderViewItem::isRemovable()
{
	if( mListener )
	{
		return mListener->isItemRemovable();
	}
	else
	{
		return TRUE;
	}
}

void LLFolderViewItem::destroyView()
{
	if (mParentFolder)
	{
		// removeView deletes me
		mParentFolder->removeView(this);
	}
}

// Call through to the viewed object and return true if it can be
// removed.
//BOOL LLFolderViewItem::removeRecursively(BOOL single_item)
BOOL LLFolderViewItem::remove()
{
	if(!isRemovable())
	{
		return FALSE;
	}
	if(mListener)
	{
		return mListener->removeItem();
	}
	return TRUE;
}

// Build an appropriate context menu for the item.
void LLFolderViewItem::buildContextMenu(LLMenuGL& menu, U32 flags)
{
	if(mListener)
	{
		mListener->buildContextMenu(menu, flags);
	}
}

void LLFolderViewItem::openItem( void )
{
	if( mListener )
	{
		mListener->openItem();
	}
}

void LLFolderViewItem::preview( void )
{
	if (mListener)
	{
		mListener->previewItem();
	}
}

void LLFolderViewItem::rename(const std::string& new_name)
{
	if( !new_name.empty() )
	{
		if( mListener )
		{
			mListener->renameItem(new_name);

			if(mParentFolder)
			{
				mParentFolder->requestSort();
			}
		}
	}
}

const std::string& LLFolderViewItem::getSearchableLabel() const
{
	return mSearchableLabel;
}

LLViewerInventoryItem * LLFolderViewItem::getInventoryItem(void)
{
	if (!getListener()) return NULL;
	return gInventory.getItem(getListener()->getUUID());
}

const std::string& LLFolderViewItem::getName( void ) const
{
	if(mListener)
	{
		return mListener->getName();
	}
	return mLabel;
}

// LLView functionality
BOOL LLFolderViewItem::handleRightMouseDown( S32 x, S32 y, MASK mask )
{
	if(!mIsSelected)
	{
		setSelectionFromRoot(this, FALSE);
	}
	make_ui_sound("UISndClick");
	return TRUE;
}

BOOL LLFolderViewItem::handleMouseDown( S32 x, S32 y, MASK mask )
{
	if (LLView::childrenHandleMouseDown(x, y, mask))
	{
		return TRUE;
	}
	
	// No handler needed for focus lost since this class has no
	// state that depends on it.
	gFocusMgr.setMouseCapture( this );

	if (!mIsSelected)
	{
		if(mask & MASK_CONTROL)
		{
			changeSelectionFromRoot(this, !mIsSelected);
		}
		else if (mask & MASK_SHIFT)
		{
			extendSelectionFromRoot(this);
		}
		else
		{
			setSelectionFromRoot(this, FALSE);
		}
		make_ui_sound("UISndClick");
	}
	else
	{
		mSelectPending = TRUE;
	}

	if( isMovable() )
	{
		S32 screen_x;
		S32 screen_y;
		localPointToScreen(x, y, &screen_x, &screen_y );
		LLToolDragAndDrop::getInstance()->setDragStart( screen_x, screen_y );
	}
	return TRUE;
}

BOOL LLFolderViewItem::handleHover( S32 x, S32 y, MASK mask )
{
	mIsMouseOverTitle = (y > (getRect().getHeight() - mItemHeight));

	if( hasMouseCapture() && isMovable() )
	{
		S32 screen_x;
		S32 screen_y;
		localPointToScreen(x, y, &screen_x, &screen_y );
		BOOL can_drag = TRUE;
		if( LLToolDragAndDrop::getInstance()->isOverThreshold( screen_x, screen_y ) )
		{
			LLFolderView* root = getRoot();

			if(root->getCurSelectedItem())
			{
				LLToolDragAndDrop::ESource src = LLToolDragAndDrop::SOURCE_WORLD;

				// *TODO: push this into listener and remove
				// dependency on llagent
				if (mListener
					&& gInventory.isObjectDescendentOf(mListener->getUUID(), gInventory.getRootFolderID()))
				{
					src = LLToolDragAndDrop::SOURCE_AGENT;
				}
				else if (mListener
					&& gInventory.isObjectDescendentOf(mListener->getUUID(), gInventory.getLibraryRootFolderID()))
				{
					src = LLToolDragAndDrop::SOURCE_LIBRARY;
				}

				can_drag = root->startDrag(src);
				if (can_drag)
				{
					// if (mListener) mListener->startDrag();
					// RN: when starting drag and drop, clear out last auto-open
					root->autoOpenTest(NULL);
					root->setShowSelectionContext(TRUE);

					// Release keyboard focus, so that if stuff is dropped into the
					// world, pressing the delete key won't blow away the inventory
					// item.
					gFocusMgr.setKeyboardFocus(NULL);

					return LLToolDragAndDrop::getInstance()->handleHover( x, y, mask );
				}
			}
		}

		if (can_drag)
		{
			gViewerWindow->setCursor(UI_CURSOR_ARROW);
		}
		else
		{
			gViewerWindow->setCursor(UI_CURSOR_NOLOCKED);
		}
		return TRUE;
	}
	else
	{
		getRoot()->setShowSelectionContext(FALSE);
		gViewerWindow->setCursor(UI_CURSOR_ARROW);
		// let parent handle this then...
		return FALSE;
	}
}


BOOL LLFolderViewItem::handleDoubleClick( S32 x, S32 y, MASK mask )
{
	preview();
	return TRUE;
}

BOOL LLFolderViewItem::handleMouseUp( S32 x, S32 y, MASK mask )
{
	if (LLView::childrenHandleMouseUp(x, y, mask))
	{
		return TRUE;
	}
	
	// if mouse hasn't moved since mouse down...
	if ( pointInView(x, y) && mSelectPending )
	{
		//...then select
		if(mask & MASK_CONTROL)
		{
			changeSelectionFromRoot(this, !mIsSelected);
		}
		else if (mask & MASK_SHIFT)
		{
			extendSelectionFromRoot(this);
		}
		else
		{
			setSelectionFromRoot(this, FALSE);
		}
	}

	mSelectPending = FALSE;

	if( hasMouseCapture() )
	{
		getRoot()->setShowSelectionContext(FALSE);
		gFocusMgr.setMouseCapture( NULL );
	}
	return TRUE;
}

void LLFolderViewItem::onMouseLeave(S32 x, S32 y, MASK mask)
{
	mIsMouseOverTitle = false;
}

BOOL LLFolderViewItem::handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
										 EDragAndDropType cargo_type,
										 void* cargo_data,
										 EAcceptance* accept,
										 std::string& tooltip_msg)
{
	BOOL accepted = FALSE;
	BOOL handled = FALSE;
	if(mListener)
	{
		accepted = mListener->dragOrDrop(mask,drop,cargo_type,cargo_data, tooltip_msg);
		handled = accepted;
		if (accepted)
		{
			mDragAndDropTarget = TRUE;
			*accept = ACCEPT_YES_MULTI;
		}
		else
		{
			*accept = ACCEPT_NO;
		}
	}
	if(mParentFolder && !handled)
	{
		// store this item to get it in LLFolderBridge::dragItemIntoFolder on drop event.
		mRoot->setDraggingOverItem(this);
		handled = mParentFolder->handleDragAndDropFromChild(mask,drop,cargo_type,cargo_data,accept,tooltip_msg);
		mRoot->setDraggingOverItem(NULL);
	}
	if (handled)
	{
		lldebugst(LLERR_USER_INPUT) << "dragAndDrop handled by LLFolderViewItem" << llendl;
	}

	return handled;
}

void LLFolderViewItem::draw()
{
	static LLUIColor sFgColor = LLUIColorTable::instance().getColor("MenuItemEnabledColor", DEFAULT_WHITE);
	static LLUIColor sHighlightBgColor = LLUIColorTable::instance().getColor("MenuItemHighlightBgColor", DEFAULT_WHITE);
	static LLUIColor sHighlightFgColor = LLUIColorTable::instance().getColor("MenuItemHighlightFgColor", DEFAULT_WHITE);
	static LLUIColor sFocusOutlineColor = LLUIColorTable::instance().getColor("InventoryFocusOutlineColor", DEFAULT_WHITE);
	static LLUIColor sFilterBGColor = LLUIColorTable::instance().getColor("FilterBackgroundColor", DEFAULT_WHITE);
	static LLUIColor sFilterTextColor = LLUIColorTable::instance().getColor("FilterTextColor", DEFAULT_WHITE);
	static LLUIColor sSuffixColor = LLUIColorTable::instance().getColor("InventoryItemColor", DEFAULT_WHITE);
	static LLUIColor sLibraryColor = LLUIColorTable::instance().getColor("InventoryItemLibraryColor", DEFAULT_WHITE);
	static LLUIColor sLinkColor = LLUIColorTable::instance().getColor("InventoryItemLinkColor", DEFAULT_WHITE);
	static LLUIColor sSearchStatusColor = LLUIColorTable::instance().getColor("InventorySearchStatusColor", DEFAULT_WHITE);
	static LLUIColor sMouseOverColor = LLUIColorTable::instance().getColor("InventoryMouseOverColor", DEFAULT_WHITE);

	const Params& default_params = LLUICtrlFactory::getDefaultParams<LLFolderViewItem>();
	const S32 TOP_PAD = default_params.item_top_pad;
	const S32 FOCUS_LEFT = 1;
	const LLFontGL* font = getLabelFontForStyle(mLabelStyle);

	const BOOL in_inventory = getListener() && gInventory.isObjectDescendentOf(getListener()->getUUID(), gInventory.getRootFolderID());
	const BOOL in_library = getListener() && gInventory.isObjectDescendentOf(getListener()->getUUID(), gInventory.getLibraryRootFolderID());

	//--------------------------------------------------------------------------------//
	// Draw open folder arrow
	//
	const bool up_to_date = mListener && mListener->isUpToDate();
	const bool possibly_has_children = ((up_to_date && hasVisibleChildren()) // we fetched our children and some of them have passed the filter...
										|| (!up_to_date && mListener && mListener->hasChildren())); // ...or we know we have children but haven't fetched them (doesn't obey filter)
	if (possibly_has_children)
	{
		LLUIImage* arrow_image = default_params.folder_arrow_image;
		gl_draw_scaled_rotated_image(
			mIndentation, getRect().getHeight() - ARROW_SIZE - TEXT_PAD - TOP_PAD,
			ARROW_SIZE, ARROW_SIZE, mControlLabelRotation, arrow_image->getImage(), sFgColor);
	}


	//--------------------------------------------------------------------------------//
	// Draw highlight for selected items
	//
	const BOOL show_context = getRoot()->getShowSelectionContext();
	const BOOL filled = show_context || (getRoot()->getParentPanel()->hasFocus()); // If we have keyboard focus, draw selection filled
	const S32 focus_top = getRect().getHeight();
	const S32 focus_bottom = getRect().getHeight() - mItemHeight;
	const bool folder_open = (getRect().getHeight() > mItemHeight + 4);
	if (mIsSelected) // always render "current" item.  Only render other selected items if mShowSingleSelection is FALSE
	{
		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
		LLColor4 bg_color = sHighlightBgColor;
		if (!mIsCurSelection)
		{
			// do time-based fade of extra objects
			F32 fade_time = getRoot()->getSelectionFadeElapsedTime();
			if (getRoot()->getShowSingleSelection())
			{
				// fading out
				bg_color.mV[VALPHA] = clamp_rescale(fade_time, 0.f, 0.4f, bg_color.mV[VALPHA], 0.f);
			}
			else
			{
				// fading in
				bg_color.mV[VALPHA] = clamp_rescale(fade_time, 0.f, 0.4f, 0.f, bg_color.mV[VALPHA]);
			}
		}
		gl_rect_2d(FOCUS_LEFT,
				   focus_top, 
				   getRect().getWidth() - 2,
				   focus_bottom,
				   bg_color, filled);
		if (mIsCurSelection)
		{
			gl_rect_2d(FOCUS_LEFT, 
					   focus_top, 
					   getRect().getWidth() - 2,
					   focus_bottom,
					   sFocusOutlineColor, FALSE);
		}
		if (folder_open)
		{
			gl_rect_2d(FOCUS_LEFT,
					   focus_bottom + 1, // overlap with bottom edge of above rect
					   getRect().getWidth() - 2,
					   0,
					   sFocusOutlineColor, FALSE);
			if (show_context)
			{
				gl_rect_2d(FOCUS_LEFT,
						   focus_bottom + 1,
						   getRect().getWidth() - 2,
						   0,
						   sHighlightBgColor, TRUE);
			}
		}
	}
	else if (mIsMouseOverTitle)
	{
		gl_rect_2d(FOCUS_LEFT,
			focus_top, 
			getRect().getWidth() - 2,
			focus_bottom,
			sMouseOverColor, FALSE);
	}

	//--------------------------------------------------------------------------------//
	// Draw DragNDrop highlight
	//
	if (mDragAndDropTarget)
	{
		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
		gl_rect_2d(FOCUS_LEFT, 
				   focus_top, 
				   getRect().getWidth() - 2,
				   focus_bottom,
				   sHighlightBgColor, FALSE);
		if (folder_open)
		{
			gl_rect_2d(FOCUS_LEFT,
					   focus_bottom + 1, // overlap with bottom edge of above rect
					   getRect().getWidth() - 2,
					   0,
					   sHighlightBgColor, FALSE);
		}
		mDragAndDropTarget = FALSE;
	}

	const LLViewerInventoryItem *item = getInventoryItem();
	const BOOL highlight_link = mIconOverlay && item && item->getIsLinkType();
	//--------------------------------------------------------------------------------//
	// Draw open icon
	//
	const S32 icon_x = mIndentation + ARROW_SIZE + TEXT_PAD;
	if (!mIconOpen.isNull() && (llabs(mControlLabelRotation) > 80)) // For open folders
 	{
		mIconOpen->draw(icon_x, getRect().getHeight() - mIconOpen->getHeight() - TOP_PAD + 1);
	}
	else if (mIcon)
	{
 		mIcon->draw(icon_x, getRect().getHeight() - mIcon->getHeight() - TOP_PAD + 1);
 	}

	if (highlight_link)
	{
		mIconOverlay->draw(icon_x, getRect().getHeight() - mIcon->getHeight() - TOP_PAD + 1);
	}

	//--------------------------------------------------------------------------------//
	// Exit if no label to draw
	//
	if (mLabel.empty())
	{
		return;
	}

	LLColor4 color = (mIsSelected && filled) ? sHighlightFgColor : sFgColor;
	if (highlight_link) color = sLinkColor;
	if (in_library) color = sLibraryColor;

	F32 right_x  = 0;
	F32 y = (F32)getRect().getHeight() - font->getLineHeight() - (F32)TEXT_PAD - (F32)TOP_PAD;
	F32 text_left = (F32)(ARROW_SIZE + TEXT_PAD + ICON_WIDTH + ICON_PAD + mIndentation);

	//--------------------------------------------------------------------------------//
	// Highlight filtered text
	//
	if (getRoot()->getDebugFilters())
	{
		if (!getFiltered() && !possibly_has_children)
		{
			color.mV[VALPHA] *= 0.5f;
		}
		LLColor4 filter_color = mLastFilterGeneration >= getRoot()->getFilter()->getCurrentGeneration() ? 
			LLColor4(0.5f, 0.8f, 0.5f, 1.f) : 
			LLColor4(0.8f, 0.5f, 0.5f, 1.f);
		LLFontGL::getFontMonospace()->renderUTF8(mStatusText, 0, text_left, y, filter_color,
												 LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW,
												 S32_MAX, S32_MAX, &right_x, FALSE );
		text_left = right_x;
	}
	//--------------------------------------------------------------------------------//
	// Draw the actual label text
	//
	font->renderUTF8(mLabel, 0, text_left, y, color,
					 LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW,
					 S32_MAX, getRect().getWidth() - (S32) text_left, &right_x, TRUE);

	//--------------------------------------------------------------------------------//
	// Draw "Loading..." text
	//
	bool root_is_loading = false;
	if (in_inventory)
	{
		root_is_loading = LLInventoryModelBackgroundFetch::instance().inventoryFetchInProgress(); 
	}
	if (in_library)
	{
		root_is_loading = LLInventoryModelBackgroundFetch::instance().libraryFetchInProgress();
	}
	if ((mIsLoading
		&&	mTimeSinceRequestStart.getElapsedTimeF32() >= gSavedSettings.getF32("FolderLoadingMessageWaitTime"))
			||	(LLInventoryModelBackgroundFetch::instance().backgroundFetchActive()
				&&	root_is_loading
				&&	mShowLoadStatus))
	{
		std::string load_string = " ( " + LLTrans::getString("LoadingData") + " ) ";
		font->renderUTF8(load_string, 0, right_x, y, sSearchStatusColor,
						 LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, 
						 S32_MAX, S32_MAX, &right_x, FALSE);
	}

	//--------------------------------------------------------------------------------//
	// Draw label suffix
	//
	if (!mLabelSuffix.empty())
	{
		font->renderUTF8( mLabelSuffix, 0, right_x, y, sSuffixColor,
						  LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW,
						  S32_MAX, S32_MAX, &right_x, FALSE );
	}

	//--------------------------------------------------------------------------------//
	// Highlight string match
	//
	if (mStringMatchOffset != std::string::npos)
	{
		// don't draw backgrounds for zero-length strings
		S32 filter_string_length = getRoot()->getFilterSubString().size();
		if (filter_string_length > 0)
		{
			std::string combined_string = mLabel + mLabelSuffix;
			S32 left = llround(text_left) + font->getWidth(combined_string, 0, mStringMatchOffset) - 1;
			S32 right = left + font->getWidth(combined_string, mStringMatchOffset, filter_string_length) + 2;
			S32 bottom = llfloor(getRect().getHeight() - font->getLineHeight() - 3 - TOP_PAD);
			S32 top = getRect().getHeight() - TOP_PAD;
		
			LLUIImage* box_image = default_params.selection_image;
			LLRect box_rect(left, top, right, bottom);
			box_image->draw(box_rect, sFilterBGColor);
			F32 match_string_left = text_left + font->getWidthF32(combined_string, 0, mStringMatchOffset);
			F32 yy = (F32)getRect().getHeight() - font->getLineHeight() - (F32)TEXT_PAD - (F32)TOP_PAD;
			font->renderUTF8( combined_string, mStringMatchOffset, match_string_left, yy,
							  sFilterTextColor, LLFontGL::LEFT, LLFontGL::BOTTOM, LLFontGL::NORMAL, LLFontGL::NO_SHADOW,
							  filter_string_length, S32_MAX, &right_x, FALSE );
		}
	}
}


///----------------------------------------------------------------------------
/// Class LLFolderViewFolder
///----------------------------------------------------------------------------

LLFolderViewFolder::LLFolderViewFolder( const LLFolderViewItem::Params& p ): 
	LLFolderViewItem( p ),	// 0 = no create time
	mNumDescendantsSelected(0),
	mIsOpen(FALSE),
	mExpanderHighlighted(FALSE),
	mCurHeight(0.f),
	mTargetHeight(0.f),
	mAutoOpenCountdown(0.f),
	mSubtreeCreationDate(0),
	mAmTrash(LLFolderViewFolder::UNKNOWN),
	mLastArrangeGeneration( -1 ),
	mLastCalculatedWidth(0),
	mCompletedFilterGeneration(-1),
	mMostFilteredDescendantGeneration(-1),
	mNeedsSort(false),
	mPassedFolderFilter(FALSE)
{
}

// Destroys the object
LLFolderViewFolder::~LLFolderViewFolder( void )
{
	// The LLView base class takes care of object destruction. make sure that we
	// don't have mouse or keyboard focus
	gFocusMgr.releaseFocusIfNeeded( this ); // calls onCommit()
}

void LLFolderViewFolder::setFilteredFolder(bool filtered, S32 filter_generation)
{
	mPassedFolderFilter = filtered;
	mLastFilterGeneration = filter_generation;
}

bool LLFolderViewFolder::getFilteredFolder(S32 filter_generation)
{
	return mPassedFolderFilter && mLastFilterGeneration >= getRoot()->getFilter()->getMinRequiredGeneration();
}

// addToFolder() returns TRUE if it succeeds. FALSE otherwise
BOOL LLFolderViewFolder::addToFolder(LLFolderViewFolder* folder, LLFolderView* root)
{
	if (!folder)
	{
		return FALSE;
	}
	mParentFolder = folder;
	root->addItemID(getListener()->getUUID(), this);
	return folder->addFolder(this);
}

// Finds width and height of this object and its children. Also
// makes sure that this view and its children are the right size.
S32 LLFolderViewFolder::arrange( S32* width, S32* height, S32 filter_generation)
{
	// sort before laying out contents
	if (mNeedsSort)
	{
		mFolders.sort(mSortFunction);
		mItems.sort(mSortFunction);
		mNeedsSort = false;
	}

	mHasVisibleChildren = hasFilteredDescendants(filter_generation);

	// calculate height as a single item (without any children), and reshapes rectangle to match
	LLFolderViewItem::arrange( width, height, filter_generation );

	// clamp existing animated height so as to never get smaller than a single item
	mCurHeight = llmax((F32)*height, mCurHeight);

	// initialize running height value as height of single item in case we have no children
	*height = getItemHeight();
	F32 running_height = (F32)*height;
	F32 target_height = (F32)*height;

	// are my children visible?
	if (needsArrange())
	{
		// set last arrange generation first, in case children are animating
		// and need to be arranged again
		mLastArrangeGeneration = getRoot()->getArrangeGeneration();
		if (mIsOpen)
		{
			// Add sizes of children
			S32 parent_item_height = getRect().getHeight();

			for(folders_t::iterator fit = mFolders.begin(); fit != mFolders.end(); ++fit)
			{
				LLFolderViewFolder* folderp = (*fit);
				if (getRoot()->getDebugFilters())
				{
					folderp->setVisible(TRUE);
				}
				else
				{
					folderp->setVisible( folderp->getListener()
										&&	(folderp->getFiltered(filter_generation)
											||	(folderp->getFilteredFolder(filter_generation) 
												&& folderp->hasFilteredDescendants(filter_generation)))); // passed filter or has descendants that passed filter
				}

				if (folderp->getVisible())
				{
					S32 child_width = *width;
					S32 child_height = 0;
					S32 child_top = parent_item_height - llround(running_height);

					target_height += folderp->arrange( &child_width, &child_height, filter_generation );

					running_height += (F32)child_height;
					*width = llmax(*width, child_width);
					folderp->setOrigin( 0, child_top - folderp->getRect().getHeight() );
				}
			}
			for(items_t::iterator iit = mItems.begin();
				iit != mItems.end(); ++iit)
			{
				LLFolderViewItem* itemp = (*iit);
				if (getRoot()->getDebugFilters())
				{
					itemp->setVisible(TRUE);
				}
				else
				{
					itemp->setVisible(itemp->getFiltered(filter_generation));
				}

				if (itemp->getVisible())
				{
					S32 child_width = *width;
					S32 child_height = 0;
					S32 child_top = parent_item_height - llround(running_height);

					target_height += itemp->arrange( &child_width, &child_height, filter_generation );
					// don't change width, as this item is as wide as its parent folder by construction
					itemp->reshape( itemp->getRect().getWidth(), child_height);

					running_height += (F32)child_height;
					*width = llmax(*width, child_width);
					itemp->setOrigin( 0, child_top - itemp->getRect().getHeight() );
				}
			}
		}

		mTargetHeight = target_height;
		// cache this width so next time we can just return it
		mLastCalculatedWidth = *width;
	}
	else
	{
		// just use existing width
		*width = mLastCalculatedWidth;
	}

	// animate current height towards target height
	if (llabs(mCurHeight - mTargetHeight) > 1.f)
	{
		mCurHeight = lerp(mCurHeight, mTargetHeight, LLCriticalDamp::getInterpolant(mIsOpen ? FOLDER_OPEN_TIME_CONSTANT : FOLDER_CLOSE_TIME_CONSTANT));

		requestArrange();

		// hide child elements that fall out of current animated height
		for (folders_t::iterator iter = mFolders.begin();
			iter != mFolders.end();)
		{
			folders_t::iterator fit = iter++;
			// number of pixels that bottom of folder label is from top of parent folder
			if (getRect().getHeight() - (*fit)->getRect().mTop + (*fit)->getItemHeight() 
				> llround(mCurHeight) + MAX_FOLDER_ITEM_OVERLAP)
			{
				// hide if beyond current folder height
				(*fit)->setVisible(FALSE);
			}
		}

		for (items_t::iterator iter = mItems.begin();
			iter != mItems.end();)
		{
			items_t::iterator iit = iter++;
			// number of pixels that bottom of item label is from top of parent folder
			if (getRect().getHeight() - (*iit)->getRect().mBottom
				> llround(mCurHeight) + MAX_FOLDER_ITEM_OVERLAP)
			{
				(*iit)->setVisible(FALSE);
			}
		}
	}
	else
	{
		mCurHeight = mTargetHeight;
	}

	// don't change width as this item is already as wide as its parent folder
	reshape(getRect().getWidth(),llround(mCurHeight));

	// pass current height value back to parent
	*height = llround(mCurHeight);

	return llround(mTargetHeight);
}

BOOL LLFolderViewFolder::needsArrange()
{
	return mLastArrangeGeneration < getRoot()->getArrangeGeneration(); 
}

void LLFolderViewFolder::requestSort()
{
	mNeedsSort = true;
	// whenever item order changes, we need to lay things out again
	requestArrange();
}

void LLFolderViewFolder::setCompletedFilterGeneration(S32 generation, BOOL recurse_up)
{
	mMostFilteredDescendantGeneration = llmin(mMostFilteredDescendantGeneration, generation);
	mCompletedFilterGeneration = generation;
	// only aggregate up if we are a lower (older) value
	if (recurse_up
		&& mParentFolder
		&& generation < mParentFolder->getCompletedFilterGeneration())
	{
		mParentFolder->setCompletedFilterGeneration(generation, TRUE);
	}
}

void LLFolderViewFolder::filter( LLInventoryFilter& filter)
{
	S32 filter_generation = filter.getCurrentGeneration();
	// if failed to pass filter newer than must_pass_generation
	// you will automatically fail this time, so we only
	// check against items that have passed the filter
	S32 must_pass_generation = filter.getMustPassGeneration();
	
	bool autoopen_folders = (filter.hasFilterString());

	// if we have already been filtered against this generation, skip out
	if (getCompletedFilterGeneration() >= filter_generation)
	{
		return;
	}

	// filter folder itself
	if (getLastFilterGeneration() < filter_generation)
	{
		if (getLastFilterGeneration() >= must_pass_generation	// folder has been compared to a valid precursor filter
			&& !mPassedFilter)									// and did not pass the filter
		{
			// go ahead and flag this folder as done
			mLastFilterGeneration = filter_generation;			
		}
		else // filter self only on first pass through
		{
			// filter against folder rules
			filterFolder(filter);
			// and then item rules
			LLFolderViewItem::filter( filter );
		}
	}

	if (getRoot()->getDebugFilters())
	{
		mStatusText = llformat("%d", mLastFilterGeneration);
		mStatusText += llformat("(%d)", mCompletedFilterGeneration);
		mStatusText += llformat("+%d", mMostFilteredDescendantGeneration);
	}

	// all descendants have been filtered later than must pass generation
	// but none passed
	if(getCompletedFilterGeneration() >= must_pass_generation && !hasFilteredDescendants(must_pass_generation))
	{
		// don't traverse children if we've already filtered them since must_pass_generation
		// and came back with nothing
		return;
	}

	// we entered here with at least one filter iteration left
	// check to see if we have any more before continuing on to children
	if (filter.getFilterCount() < 0)
	{
		return;
	}

	// when applying a filter, matching folders get their contents downloaded first
	if (filter.isNotDefault()
		&& getFiltered(filter.getMinRequiredGeneration())
		&&	(mListener
			&& !gInventory.isCategoryComplete(mListener->getUUID())))
	{
		LLInventoryModelBackgroundFetch::instance().start(mListener->getUUID());
	}

	// now query children
	for (folders_t::iterator iter = mFolders.begin();
		 iter != mFolders.end();
		 ++iter)
	{
		LLFolderViewFolder* folder = (*iter);
		// have we run out of iterations this frame?
		if (filter.getFilterCount() < 0)
		{
			break;
		}

		// mMostFilteredDescendantGeneration might have been reset
		// in which case we need to update it even for folders that
		// don't need to be filtered anymore
		if (folder->getCompletedFilterGeneration() >= filter_generation)
		{
			// track latest generation to pass any child items
			if (folder->getFiltered() || folder->hasFilteredDescendants(filter.getMinRequiredGeneration()))
			{
				mMostFilteredDescendantGeneration = filter_generation;
				requestArrange();
			}
			// just skip it, it has already been filtered
			continue;
		}

		// update this folders filter status (and children)
		folder->filter( filter );

		// track latest generation to pass any child items
		if (folder->getFiltered() || folder->hasFilteredDescendants(filter_generation))
		{
			mMostFilteredDescendantGeneration = filter_generation;
			requestArrange();
			if (getRoot()->needsAutoSelect() && autoopen_folders)
			{
				folder->setOpenArrangeRecursively(TRUE);
			}
		}
	}

	for (items_t::iterator iter = mItems.begin();
		 iter != mItems.end();
		 ++iter)
	{
		LLFolderViewItem* item = (*iter);
		if (filter.getFilterCount() < 0)
		{
			break;
		}
		if (item->getLastFilterGeneration() >= filter_generation)
		{
			if (item->getFiltered())
			{
				mMostFilteredDescendantGeneration = filter_generation;
				requestArrange();
			}
			continue;
		}

		if (item->getLastFilterGeneration() >= must_pass_generation && 
			!item->getFiltered(must_pass_generation))
		{
			// failed to pass an earlier filter that was a subset of the current one
			// go ahead and flag this item as done
			item->setFiltered(FALSE, filter_generation);
			continue;
		}

		item->filter( filter );

		if (item->getFiltered(filter.getMinRequiredGeneration()))
		{
			mMostFilteredDescendantGeneration = filter_generation;
			requestArrange();
		}
	}

	// if we didn't use all filter iterations
	// that means we filtered all of our descendants
	// instead of exhausting the filter count for this frame
	if (filter.getFilterCount() > 0)
	{
		// flag this folder as having completed filter pass for all descendants
		setCompletedFilterGeneration(filter_generation, FALSE/*dont recurse up to root*/);
	}
}

void LLFolderViewFolder::filterFolder(LLInventoryFilter& filter)
{
	const BOOL previous_passed_filter = mPassedFolderFilter;
	const BOOL passed_filter = filter.checkFolder(this);

	// If our visibility will change as a result of this filter, then
	// we need to be rearranged in our parent folder
	if (mParentFolder)
	{
		if (getVisible() != passed_filter
			|| previous_passed_filter != passed_filter )
		{
			mParentFolder->requestArrange();
		}
	}

	setFilteredFolder(passed_filter, filter.getCurrentGeneration());
	filter.decrementFilterCount();

	if (getRoot()->getDebugFilters())
	{
		mStatusText = llformat("%d", mLastFilterGeneration);
	}
}

void LLFolderViewFolder::setFiltered(BOOL filtered, S32 filter_generation)
{
	// if this folder is now filtered, but wasn't before
	// (it just passed)
	if (filtered && !mPassedFilter)
	{
		// reset current height, because last time we drew it
		// it might have had more visible items than now
		mCurHeight = 0.f;
	}

	LLFolderViewItem::setFiltered(filtered, filter_generation);
}

void LLFolderViewFolder::dirtyFilter()
{
	// we're a folder, so invalidate our completed generation
	setCompletedFilterGeneration(-1, FALSE);
	LLFolderViewItem::dirtyFilter();
}

BOOL LLFolderViewFolder::getFiltered() 
{ 
	return getFilteredFolder(getRoot()->getFilter()->getMinRequiredGeneration()) 
		&& LLFolderViewItem::getFiltered(); 
}

BOOL LLFolderViewFolder::getFiltered(S32 filter_generation) 
{
	return getFilteredFolder(filter_generation) && LLFolderViewItem::getFiltered(filter_generation);
}

BOOL LLFolderViewFolder::hasFilteredDescendants(S32 filter_generation)
{ 
	return mMostFilteredDescendantGeneration >= filter_generation; 
}


BOOL LLFolderViewFolder::hasFilteredDescendants()
{
	return mMostFilteredDescendantGeneration >= getRoot()->getFilter()->getCurrentGeneration();
}

void LLFolderViewFolder::recursiveIncrementNumDescendantsSelected(S32 increment)
{
	LLFolderViewFolder* parent_folder = this;
	do
	{
		parent_folder->mNumDescendantsSelected += increment;

		// Make sure we don't have negative values.
		llassert(parent_folder->mNumDescendantsSelected >= 0);

		parent_folder = parent_folder->getParentFolder();
	}
	while(parent_folder);
}

// Passes selection information on to children and record selection
// information if necessary.
BOOL LLFolderViewFolder::setSelection(LLFolderViewItem* selection, BOOL openitem,
                                      BOOL take_keyboard_focus)
{
	BOOL rv = FALSE;
	if (selection == this)
	{
		if (!isSelected())
		{
			selectItem();
		}
		if (mListener)
		{
			mListener->selectItem();
		}
		rv = TRUE;
	}
	else
	{
		if (isSelected())
		{
			deselectItem();
		}
		rv = FALSE;
	}
	BOOL child_selected = FALSE;

	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		if((*fit)->setSelection(selection, openitem, take_keyboard_focus))
		{
			rv = TRUE;
			child_selected = TRUE;
		}
	}
	for (items_t::iterator iter = mItems.begin();
		iter != mItems.end();)
	{
		items_t::iterator iit = iter++;
		if((*iit)->setSelection(selection, openitem, take_keyboard_focus))
		{
			rv = TRUE;
			child_selected = TRUE;
		}
	}
	if(openitem && child_selected)
	{
		setOpenArrangeRecursively(TRUE);
	}
	return rv;
}

// This method is used to change the selection of an item.
// Recursively traverse all children; if 'selection' is 'this' then change
// the select status if necessary.
// Returns TRUE if the selection state of this folder, or of a child, was changed.
BOOL LLFolderViewFolder::changeSelection(LLFolderViewItem* selection, BOOL selected)
{
	BOOL rv = FALSE;
	if(selection == this)
	{
		if (isSelected() != selected)
		{
			rv = TRUE;
			if (selected)
			{
				selectItem();
			}
			else
			{
				deselectItem();
			}
		}
		if (mListener && selected)
		{
			mListener->selectItem();
		}
	}

	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		if((*fit)->changeSelection(selection, selected))
		{
			rv = TRUE;
		}
	}
	for (items_t::iterator iter = mItems.begin();
		iter != mItems.end();)
	{
		items_t::iterator iit = iter++;
		if((*iit)->changeSelection(selection, selected))
		{
			rv = TRUE;
		}
	}
	return rv;
}

void LLFolderViewFolder::extendSelection(LLFolderViewItem* selection, LLFolderViewItem* last_selected, LLDynamicArray<LLFolderViewItem*>& selected_items)
{
	// pass on to child folders first
	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		(*fit)->extendSelection(selection, last_selected, selected_items);
	}

	// handle selection of our immediate children...
	BOOL reverse_select = FALSE;
	BOOL found_last_selected = FALSE;
	BOOL found_selection = FALSE;
	LLDynamicArray<LLFolderViewItem*> items_to_select;
	LLFolderViewItem* item;

	//...folders first...
	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		item = (*fit);
		if(item == selection)
		{
			found_selection = TRUE;
		}
		else if (item == last_selected)
		{
			found_last_selected = TRUE;
			if (found_selection)
			{
				reverse_select = TRUE;
			}
		}

		if (found_selection || found_last_selected)
		{
			// deselect currently selected items so they can be pushed back on queue
			if (item->isSelected())
			{
				item->changeSelection(item, FALSE);
			}
			items_to_select.put(item);
		}

		if (found_selection && found_last_selected)
		{
			break;
		}		
	}

	if (!(found_selection && found_last_selected))
	{
		//,,,then items
		for (items_t::iterator iter = mItems.begin();
			iter != mItems.end();)
		{
			items_t::iterator iit = iter++;
			item = (*iit);
			if(item == selection)
			{
				found_selection = TRUE;
			}
			else if (item == last_selected)
			{
				found_last_selected = TRUE;
				if (found_selection)
				{
					reverse_select = TRUE;
				}
			}

			if (found_selection || found_last_selected)
			{
				// deselect currently selected items so they can be pushed back on queue
				if (item->isSelected())
				{
					item->changeSelection(item, FALSE);
				}
				items_to_select.put(item);
			}

			if (found_selection && found_last_selected)
			{
				break;
			}
		}
	}

	if (found_last_selected && found_selection)
	{
		// we have a complete selection inside this folder
		for (S32 index = reverse_select ? items_to_select.getLength() - 1 : 0; 
			reverse_select ? index >= 0 : index < items_to_select.getLength(); reverse_select ? index-- : index++)
		{
			LLFolderViewItem* item = items_to_select[index];
			if (item->changeSelection(item, TRUE))
			{
				selected_items.put(item);
			}
		}
	}
	else if (found_selection)
	{
		// last selection was not in this folder....go ahead and select just the new item
		if (selection->changeSelection(selection, TRUE))
		{
			selected_items.put(selection);
		}
	}
}

void LLFolderViewFolder::destroyView()
{
	for (items_t::iterator iter = mItems.begin();
		iter != mItems.end();)
	{
		items_t::iterator iit = iter++;
		LLFolderViewItem* item = (*iit);
		getRoot()->removeItemID(item->getListener()->getUUID());
	}

	std::for_each(mItems.begin(), mItems.end(), DeletePointer());
	mItems.clear();

	while (!mFolders.empty())
	{
		LLFolderViewFolder *folderp = mFolders.back();
		folderp->destroyView(); // removes entry from mFolders
	}

	//deleteAllChildren();

	if (mParentFolder)
	{
		mParentFolder->removeView(this);
	}
}

// remove the specified item (and any children) if possible. Return
// TRUE if the item was deleted.
BOOL LLFolderViewFolder::removeItem(LLFolderViewItem* item)
{
	if(item->remove())
	{
		return TRUE;
	}
	return FALSE;
}

// simply remove the view (and any children) Don't bother telling the
// listeners.
void LLFolderViewFolder::removeView(LLFolderViewItem* item)
{
	if (!item || item->getParentFolder() != this)
	{
		return;
	}
	// deselect without traversing hierarchy
	if (item->isSelected())
	{
		item->deselectItem();
	}
	getRoot()->removeFromSelectionList(item);
	extractItem(item);
	delete item;
}

// extractItem() removes the specified item from the folder, but
// doesn't delete it.
void LLFolderViewFolder::extractItem( LLFolderViewItem* item )
{
	items_t::iterator it = std::find(mItems.begin(), mItems.end(), item);
	if(it == mItems.end())
	{
		// This is an evil downcast. However, it's only doing
		// pointer comparison to find if (which it should be ) the
		// item is in the container, so it's pretty safe.
		LLFolderViewFolder* f = static_cast<LLFolderViewFolder*>(item);
		folders_t::iterator ft;
		ft = std::find(mFolders.begin(), mFolders.end(), f);
		if (ft != mFolders.end())
		{
			if ((*ft)->numSelected())
			{
				recursiveIncrementNumDescendantsSelected(-(*ft)->numSelected());
			}
			mFolders.erase(ft);
		}
	}
	else
	{
		if ((*it)->isSelected())
		{
			recursiveIncrementNumDescendantsSelected(-1);
		}
		mItems.erase(it);
	}
	//item has been removed, need to update filter
	dirtyFilter();
	//because an item is going away regardless of filter status, force rearrange
	requestArrange();
	getRoot()->removeItemID(item->getListener()->getUUID());
	removeChild(item);
}

bool LLFolderViewFolder::isTrash() const
{
	if (mAmTrash == LLFolderViewFolder::UNKNOWN)
	{
		mAmTrash = mListener->getUUID() == gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH, false) ? LLFolderViewFolder::TRASH : LLFolderViewFolder::NOT_TRASH;
	}
	return mAmTrash == LLFolderViewFolder::TRASH;
}

void LLFolderViewFolder::sortBy(U32 order)
{
	if (!mSortFunction.updateSort(order))
	{
		// No changes.
		return;
	}

	// Propagate this change to sub folders
	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		(*fit)->sortBy(order);
	}

	// Don't sort the topmost folders (My Inventory and Library)
	if (mListener->getUUID().notNull())
	{
		mFolders.sort(mSortFunction);
		mItems.sort(mSortFunction);
	}

	if (order & LLInventoryFilter::SO_DATE)
	{
		time_t latest = 0;

		if (!mItems.empty())
		{
			LLFolderViewItem* item = *(mItems.begin());
			latest = item->getCreationDate();
		}

		if (!mFolders.empty())
		{
			LLFolderViewFolder* folder = *(mFolders.begin());
			if (folder->getCreationDate() > latest)
			{
				latest = folder->getCreationDate();
			}
		}
		mSubtreeCreationDate = latest;
	}
}

void LLFolderViewFolder::setItemSortOrder(U32 ordering)
{
	if (mSortFunction.updateSort(ordering))
	{
		for (folders_t::iterator iter = mFolders.begin();
			iter != mFolders.end();)
		{
			folders_t::iterator fit = iter++;
			(*fit)->setItemSortOrder(ordering);
		}

		mFolders.sort(mSortFunction);
		mItems.sort(mSortFunction);
	}
}

EInventorySortGroup LLFolderViewFolder::getSortGroup() const
{
	if (isTrash())
	{
		return SG_TRASH_FOLDER;
	}

	if( mListener )
	{
		if(LLFolderType::lookupIsProtectedType(mListener->getPreferredType()))
		{
			return SG_SYSTEM_FOLDER;
		}
	}

	return SG_NORMAL_FOLDER;
}

BOOL LLFolderViewFolder::isMovable()
{
	if( mListener )
	{
		if( !(mListener->isItemMovable()) )
		{
			return FALSE;
		}

		for (items_t::iterator iter = mItems.begin();
			iter != mItems.end();)
		{
			items_t::iterator iit = iter++;
			if(!(*iit)->isMovable())
			{
				return FALSE;
			}
		}

		for (folders_t::iterator iter = mFolders.begin();
			iter != mFolders.end();)
		{
			folders_t::iterator fit = iter++;
			if(!(*fit)->isMovable())
			{
				return FALSE;
			}
		}
	}
	return TRUE;
}


BOOL LLFolderViewFolder::isRemovable()
{
	if( mListener )
	{
		if( !(mListener->isItemRemovable()) )
		{
			return FALSE;
		}

		for (items_t::iterator iter = mItems.begin();
			iter != mItems.end();)
		{
			items_t::iterator iit = iter++;
			if(!(*iit)->isRemovable())
			{
				return FALSE;
			}
		}

		for (folders_t::iterator iter = mFolders.begin();
			iter != mFolders.end();)
		{
			folders_t::iterator fit = iter++;
			if(!(*fit)->isRemovable())
			{
				return FALSE;
			}
		}
	}
	return TRUE;
}

// this is an internal method used for adding items to folders. 
BOOL LLFolderViewFolder::addItem(LLFolderViewItem* item)
{
	mItems.push_back(item);
	
	if (item->isSelected())
	{
		recursiveIncrementNumDescendantsSelected(1);
	}
	
	item->setRect(LLRect(0, 0, getRect().getWidth(), 0));
	item->setVisible(FALSE);
	
	addChild(item);
	
	item->dirtyFilter();

	// Update the folder creation date if the child is newer than our current date
	setCreationDate(llmax<time_t>(mCreationDate, item->getCreationDate()));

	// Handle sorting
	requestArrange();
	requestSort();

	// Traverse parent folders and update creation date and resort, if necessary
	LLFolderViewFolder* parentp = getParentFolder();
	while (parentp)
	{
		// Update the folder creation date if the child is newer than our current date
		parentp->setCreationDate(llmax<time_t>(parentp->mCreationDate, item->getCreationDate()));

		if (parentp->mSortFunction.isByDate())
		{
			// parent folder doesn't have a time stamp yet, so get it from us
			parentp->requestSort();
		}

		parentp = parentp->getParentFolder();
	}

	return TRUE;
}

// this is an internal method used for adding items to folders. 
BOOL LLFolderViewFolder::addFolder(LLFolderViewFolder* folder)
{
	mFolders.push_back(folder);
	if (folder->numSelected())
	{
		recursiveIncrementNumDescendantsSelected(folder->numSelected());
	}
	folder->setOrigin(0, 0);
	folder->reshape(getRect().getWidth(), 0);
	folder->setVisible(FALSE);
	addChild( folder );
	folder->dirtyFilter();
	// rearrange all descendants too, as our indentation level might have changed
	folder->requestArrange(TRUE);
	requestSort();
	LLFolderViewFolder* parentp = getParentFolder();
	while (parentp && !parentp->mSortFunction.isByDate())
	{
		// parent folder doesn't have a time stamp yet, so get it from us
		parentp->requestSort();
		parentp = parentp->getParentFolder();
	}
	return TRUE;
}

void LLFolderViewFolder::requestArrange(BOOL include_descendants)	
{ 
	mLastArrangeGeneration = -1; 
	// flag all items up to root
	if (mParentFolder)
	{
		mParentFolder->requestArrange();
	}

	if (include_descendants)
	{
		for (folders_t::iterator iter = mFolders.begin();
			iter != mFolders.end();
			++iter)
		{
			(*iter)->requestArrange(TRUE);
		}
	}
}

void LLFolderViewFolder::toggleOpen()
{
	setOpen(!mIsOpen);
}

// Force a folder open or closed
void LLFolderViewFolder::setOpen(BOOL openitem)
{
	setOpenArrangeRecursively(openitem);
}

void LLFolderViewFolder::setOpenArrangeRecursively(BOOL openitem, ERecurseType recurse)
{
	BOOL was_open = mIsOpen;
	mIsOpen = openitem;
	if (mListener)
	{
		if(!was_open && openitem)
		{
			mListener->openItem();
		}
		else if(was_open && !openitem)
		{
			mListener->closeItem();
		}
	}

	if (recurse == RECURSE_DOWN || recurse == RECURSE_UP_DOWN)
	{
		for (folders_t::iterator iter = mFolders.begin();
			iter != mFolders.end();)
		{
			folders_t::iterator fit = iter++;
			(*fit)->setOpenArrangeRecursively(openitem, RECURSE_DOWN);		/* Flawfinder: ignore */
		}
	}
	if (mParentFolder
		&&	(recurse == RECURSE_UP
			|| recurse == RECURSE_UP_DOWN))
	{
		mParentFolder->setOpenArrangeRecursively(openitem, RECURSE_UP);
	}

	if (was_open != mIsOpen)
	{
		requestArrange();
	}
}

BOOL LLFolderViewFolder::handleDragAndDropFromChild(MASK mask,
													BOOL drop,
													EDragAndDropType c_type,
													void* cargo_data,
													EAcceptance* accept,
													std::string& tooltip_msg)
{
	BOOL accepted = mListener && mListener->dragOrDrop(mask,drop,c_type,cargo_data, tooltip_msg);
	if (accepted) 
	{
		mDragAndDropTarget = TRUE;
		*accept = ACCEPT_YES_MULTI;
	}
	else 
	{
		*accept = ACCEPT_NO;
	}

	// drag and drop to child item, so clear pending auto-opens
	getRoot()->autoOpenTest(NULL);

	return TRUE;
}

void LLFolderViewFolder::openItem( void )
{
	toggleOpen();
}

void LLFolderViewFolder::applyFunctorToChildren(LLFolderViewFunctor& functor)
{
	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		functor.doItem((*fit));
	}
	for (items_t::iterator iter = mItems.begin();
		iter != mItems.end();)
	{
		items_t::iterator iit = iter++;
		functor.doItem((*iit));
	}
}

void LLFolderViewFolder::applyFunctorRecursively(LLFolderViewFunctor& functor)
{
	functor.doFolder(this);

	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		(*fit)->applyFunctorRecursively(functor);
	}
	for (items_t::iterator iter = mItems.begin();
		iter != mItems.end();)
	{
		items_t::iterator iit = iter++;
		functor.doItem((*iit));
	}
}

void LLFolderViewFolder::applyListenerFunctorRecursively(LLFolderViewListenerFunctor& functor)
{
	functor(mListener);
	for (folders_t::iterator iter = mFolders.begin();
		iter != mFolders.end();)
	{
		folders_t::iterator fit = iter++;
		(*fit)->applyListenerFunctorRecursively(functor);
	}
	for (items_t::iterator iter = mItems.begin();
		iter != mItems.end();)
	{
		items_t::iterator iit = iter++;
		(*iit)->applyListenerFunctorRecursively(functor);
	}
}

// LLView functionality
BOOL LLFolderViewFolder::handleDragAndDrop(S32 x, S32 y, MASK mask,
										   BOOL drop,
										   EDragAndDropType cargo_type,
										   void* cargo_data,
										   EAcceptance* accept,
										   std::string& tooltip_msg)
{
	BOOL handled = FALSE;

	if (mIsOpen)
	{
		handled = (childrenHandleDragAndDrop(x, y, mask, drop, cargo_type, cargo_data, accept, tooltip_msg) != NULL);
	}

	if (!handled)
	{
		handleDragAndDropToRoot(mask, drop, cargo_type, cargo_data, accept, tooltip_msg);

		lldebugst(LLERR_USER_INPUT) << "dragAndDrop handled by LLFolderViewFolder" << llendl;
	}

	return TRUE;
}

BOOL LLFolderViewFolder::handleDragAndDropToRoot(MASK mask,
												 BOOL drop,
												 EDragAndDropType cargo_type,
												 void* cargo_data,
												 EAcceptance* accept,
												 std::string& tooltip_msg)
{
	BOOL accepted = mListener && mListener->dragOrDrop(mask, drop, cargo_type, cargo_data, tooltip_msg);
	
	if (accepted) 
	{
		mDragAndDropTarget = TRUE;
		*accept = ACCEPT_YES_MULTI;
	}
	else 
	{
		*accept = ACCEPT_NO;
	}
	
	if (!drop && accepted)
	{
		getRoot()->autoOpenTest(this);
	}
	
	return TRUE;
}


BOOL LLFolderViewFolder::handleRightMouseDown( S32 x, S32 y, MASK mask )
{
	BOOL handled = FALSE;
	// fetch contents of this folder, as context menu can depend on contents
	// still, user would have to open context menu again to see the changes
	gInventory.fetchDescendentsOf(mListener->getUUID());

	if( mIsOpen )
	{
		handled = childrenHandleRightMouseDown( x, y, mask ) != NULL;
	}
	if (!handled)
	{
		handled = LLFolderViewItem::handleRightMouseDown( x, y, mask );
	}
	return handled;
}


BOOL LLFolderViewFolder::handleHover(S32 x, S32 y, MASK mask)
{
	mIsMouseOverTitle = (y > (getRect().getHeight() - mItemHeight));

	BOOL handled = LLView::handleHover(x, y, mask);

	if (!handled)
	{
		// this doesn't do child processing
		handled = LLFolderViewItem::handleHover(x, y, mask);
	}

	return handled;
}

BOOL LLFolderViewFolder::handleMouseDown( S32 x, S32 y, MASK mask )
{
	BOOL handled = FALSE;
	if( mIsOpen )
	{
		handled = childrenHandleMouseDown(x,y,mask) != NULL;
	}
	if( !handled )
	{
		if(mIndentation < x && x < mIndentation + ARROW_SIZE + TEXT_PAD)
		{
			toggleOpen();
			handled = TRUE;
		}
		else
		{
			// do normal selection logic
			handled = LLFolderViewItem::handleMouseDown(x, y, mask);
		}
	}

	return handled;
}

BOOL LLFolderViewFolder::handleDoubleClick( S32 x, S32 y, MASK mask )
{
	/* Disable outfit double click to wear
	const LLUUID &cat_uuid = getListener()->getUUID();
	const LLViewerInventoryCategory *cat = gInventory.getCategory(cat_uuid);
	if (cat && cat->getPreferredType() == LLFolderType::FT_OUTFIT)
	{
		getListener()->performAction(NULL, NULL,"replaceoutfit");
		return TRUE;
	}
	*/

	BOOL handled = FALSE;
	if( mIsOpen )
	{
		handled = childrenHandleDoubleClick( x, y, mask ) != NULL;
	}
	if( !handled )
	{
		if(mIndentation < x && x < mIndentation + ARROW_SIZE + TEXT_PAD)
		{
			// don't select when user double-clicks plus sign
			// so as not to contradict single-click behavior
			toggleOpen();
		}
		else
		{
			setSelectionFromRoot(this, FALSE);
			toggleOpen();
		}
		handled = TRUE;
	}
	return handled;
}

void LLFolderViewFolder::draw()
{
	if (mAutoOpenCountdown != 0.f)
	{
		mControlLabelRotation = mAutoOpenCountdown * -90.f;
	}
	else if (mIsOpen)
	{
		mControlLabelRotation = lerp(mControlLabelRotation, -90.f, LLCriticalDamp::getInterpolant(0.04f));
	}
	else
	{
		mControlLabelRotation = lerp(mControlLabelRotation, 0.f, LLCriticalDamp::getInterpolant(0.025f));
	}

	bool possibly_has_children = false;
	bool up_to_date = mListener && mListener->isUpToDate();
	if(!up_to_date
		&& mListener->hasChildren()) // we know we have children but haven't fetched them (doesn't obey filter)
	{
		possibly_has_children = true;
	}


	BOOL loading = (mIsOpen
					&& possibly_has_children
					&& !up_to_date );

	if ( loading && !mIsLoading )
	{
		// Measure how long we've been in the loading state
		mTimeSinceRequestStart.reset();
	}

	mIsLoading = loading;

	LLFolderViewItem::draw();

	// draw children if root folder, or any other folder that is open or animating to closed state
	if( getRoot() == this || (mIsOpen || mCurHeight != mTargetHeight ))
	{
		LLView::draw();
	}

	mExpanderHighlighted = FALSE;
}

time_t LLFolderViewFolder::getCreationDate() const
{
	return llmax<time_t>(mCreationDate, mSubtreeCreationDate);
}


BOOL	LLFolderViewFolder::potentiallyVisible()
{
	// folder should be visible by it's own filter status
	return LLFolderViewItem::potentiallyVisible() 	
		// or one or more of its descendants have passed the minimum filter requirement
		|| hasFilteredDescendants(getRoot()->getFilter()->getMinRequiredGeneration())
		// or not all of its descendants have been checked against minimum filter requirement
		|| getCompletedFilterGeneration() < getRoot()->getFilter()->getMinRequiredGeneration(); 
}

// this does prefix traversal, as folders are listed above their contents
LLFolderViewItem* LLFolderViewFolder::getNextFromChild( LLFolderViewItem* item, BOOL include_children )
{
	BOOL found_item = FALSE;

	LLFolderViewItem* result = NULL;
	// when not starting from a given item, start at beginning
	if(item == NULL)
	{
		found_item = TRUE;
	}

	// find current item among children
	folders_t::iterator fit = mFolders.begin();
	folders_t::iterator fend = mFolders.end();

	items_t::iterator iit = mItems.begin();
	items_t::iterator iend = mItems.end();

	// if not trivially starting at the beginning, we have to find the current item
	if (!found_item)
	{
		// first, look among folders, since they are always above items
		for(; fit != fend; ++fit)
		{
			if(item == (*fit))
			{
				found_item = TRUE;
				// if we are on downwards traversal
				if (include_children && (*fit)->isOpen())
				{
					// look for first descendant
					return (*fit)->getNextFromChild(NULL, TRUE);
				}
				// otherwise advance to next folder
				++fit;
				include_children = TRUE;
				break;
			}
		}

		// didn't find in folders?  Check items...
		if (!found_item)
		{
			for(; iit != iend; ++iit)
			{
				if(item == (*iit))
				{
					found_item = TRUE;
					// point to next item
					++iit;
					break;
				}
			}
		}
	}

	if (!found_item)
	{
		// you should never call this method with an item that isn't a child
		// so we should always find something
		llassert(FALSE);
		return NULL;
	}

	// at this point, either iit or fit point to a candidate "next" item
	// if both are out of range, we need to punt up to our parent

	// now, starting from found folder, continue through folders
	// searching for next visible folder
	while(fit != fend && !(*fit)->getVisible())
	{
		// turn on downwards traversal for next folder
		++fit;
	} 

	if (fit != fend)
	{
		result = (*fit);
	}
	else
	{
		// otherwise, scan for next visible item
		while(iit != iend && !(*iit)->getVisible())
		{
			++iit;
		} 

		// check to see if we have a valid item
		if (iit != iend)
		{
			result = (*iit);
		}
	}

	if( !result && mParentFolder )
	{
		// If there are no siblings or children to go to, recurse up one level in the tree
		// and skip children for this folder, as we've already discounted them
		result = mParentFolder->getNextFromChild(this, FALSE);
	}

	return result;
}

// this does postfix traversal, as folders are listed above their contents
LLFolderViewItem* LLFolderViewFolder::getPreviousFromChild( LLFolderViewItem* item, BOOL include_children )
{
	BOOL found_item = FALSE;

	LLFolderViewItem* result = NULL;
	// when not starting from a given item, start at end
	if(item == NULL)
	{
		found_item = TRUE;
	}

	// find current item among children
	folders_t::reverse_iterator fit = mFolders.rbegin();
	folders_t::reverse_iterator fend = mFolders.rend();

	items_t::reverse_iterator iit = mItems.rbegin();
	items_t::reverse_iterator iend = mItems.rend();

	// if not trivially starting at the end, we have to find the current item
	if (!found_item)
	{
		// first, look among items, since they are always below the folders
		for(; iit != iend; ++iit)
		{
			if(item == (*iit))
			{
				found_item = TRUE;
				// point to next item
				++iit;
				break;
			}
		}

		// didn't find in items?  Check folders...
		if (!found_item)
		{
			for(; fit != fend; ++fit)
			{
				if(item == (*fit))
				{
					found_item = TRUE;
					// point to next folder
					++fit;
					break;
				}
			}
		}
	}

	if (!found_item)
	{
		// you should never call this method with an item that isn't a child
		// so we should always find something
		llassert(FALSE);
		return NULL;
	}

	// at this point, either iit or fit point to a candidate "next" item
	// if both are out of range, we need to punt up to our parent

	// now, starting from found item, continue through items
	// searching for next visible item
	while(iit != iend && !(*iit)->getVisible())
	{
		++iit;
	} 

	if (iit != iend)
	{
		// we found an appropriate item
		result = (*iit);
	}
	else
	{
		// otherwise, scan for next visible folder
		while(fit != fend && !(*fit)->getVisible())
		{
			++fit;
		} 

		// check to see if we have a valid folder
		if (fit != fend)
		{
			// try selecting child element of this folder
			if ((*fit)->isOpen())
			{
				result = (*fit)->getPreviousFromChild(NULL);
			}
			else
			{
				result = (*fit);
			}
		}
	}

	if( !result )
	{
		// If there are no siblings or children to go to, recurse up one level in the tree
		// which gets back to this folder, which will only be visited if it is a valid, visible item
		result = this;
	}

	return result;
}


bool LLInventorySort::updateSort(U32 order)
{
	if (order != mSortOrder)
	{
		mSortOrder = order;
		mByDate = (order & LLInventoryFilter::SO_DATE);
		mSystemToTop = (order & LLInventoryFilter::SO_SYSTEM_FOLDERS_TO_TOP);
		mFoldersByName = (order & LLInventoryFilter::SO_FOLDERS_BY_NAME);
		return true;
	}
	return false;
}

bool LLInventorySort::operator()(const LLFolderViewItem* const& a, const LLFolderViewItem* const& b)
{
	// ignore sort order for landmarks in the Favorites folder.
	// they should be always sorted as in Favorites bar. See EXT-719
	if (a->getSortGroup() == SG_ITEM
		&& b->getSortGroup() == SG_ITEM
		&& a->getListener()->getInventoryType() == LLInventoryType::IT_LANDMARK
		&& b->getListener()->getInventoryType() == LLInventoryType::IT_LANDMARK)
	{

		static const LLUUID& favorites_folder_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_FAVORITE);

		LLUUID a_uuid = a->getParentFolder()->getListener()->getUUID();
		LLUUID b_uuid = b->getParentFolder()->getListener()->getUUID();

		if ((a_uuid == favorites_folder_id && b_uuid == favorites_folder_id))
		{
			// *TODO: mantipov: probably it is better to add an appropriate method to LLFolderViewItem
			// or to LLInvFVBridge
			LLViewerInventoryItem* aitem = (static_cast<const LLItemBridge*>(a->getListener()))->getItem();
			LLViewerInventoryItem* bitem = (static_cast<const LLItemBridge*>(b->getListener()))->getItem();
			if (!aitem || !bitem)
				return false;
			S32 a_sort = aitem->getSortField();
			S32 b_sort = bitem->getSortField();
			return a_sort < b_sort;
		}
	}

	// We sort by name if we aren't sorting by date
	// OR if these are folders and we are sorting folders by name.
	bool by_name = (!mByDate 
		|| (mFoldersByName 
		&& (a->getSortGroup() != SG_ITEM)));

	if (a->getSortGroup() != b->getSortGroup())
	{
		if (mSystemToTop)
		{
			// Group order is System Folders, Trash, Normal Folders, Items
			return (a->getSortGroup() < b->getSortGroup());
		}
		else if (mByDate)
		{
			// Trash needs to go to the bottom if we are sorting by date
			if ( (a->getSortGroup() == SG_TRASH_FOLDER)
				|| (b->getSortGroup() == SG_TRASH_FOLDER))
			{
				return (b->getSortGroup() == SG_TRASH_FOLDER);
			}
		}
	}

	if (by_name)
	{
		S32 compare = LLStringUtil::compareDict(a->getLabel(), b->getLabel());
		if (0 == compare)
		{
			return (a->getCreationDate() > b->getCreationDate());
		}
		else
		{
			return (compare < 0);
		}
	}
	else
	{
		// BUG: This is very very slow.  The getCreationDate() is log n in number
		// of inventory items.
		time_t first_create = a->getCreationDate();
		time_t second_create = b->getCreationDate();
		if (first_create == second_create)
		{
			return (LLStringUtil::compareDict(a->getLabel(), b->getLabel()) < 0);
		}
		else
		{
			return (first_create > second_create);
		}
	}
}