/**
 * @file llfloateruipreview.cpp
 * @brief Tool for previewing and editing floaters, plus localization tool integration
 *
 * $LicenseInfo:firstyear=2008&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

// Tool for previewing floaters and panels for localization and UI design purposes.
// See: https://wiki.lindenlab.com/wiki/GUI_Preview_And_Localization_Tools
// See: https://jira.lindenlab.com/browse/DEV-16869

// *TODO: Translate error messgaes using notifications/alerts.xml

#include "llviewerprecompiledheaders.h"	// Precompiled headers

#include "llfloateruipreview.h"			// Own header

// Internal utility
#include "lldiriterator.h"
#include "lleventtimer.h"
#include "llexternaleditor.h"
#include "llrender.h"
#include "llsdutil.h"
#include "llxmltree.h"
#include "llviewerwindow.h"

// XUI
#include "lluictrlfactory.h"
#include "llcombobox.h"
#include "llnotificationsutil.h"
#include "llresizebar.h"
#include "llscrolllistitem.h"
#include "llscrolllistctrl.h"
#include "llfilepicker.h"
#include "lldraghandle.h"
#include "lllayoutstack.h"
#include "lltooltip.h"
#include "llviewermenu.h"
#include "llrngwriter.h"
#include "llfloater.h"			// superclass
#include "llfloaterreg.h"
#include "llscrollcontainer.h"	// scroll container for overlapping elements
#include "lllivefile.h"					// live file poll/stat/reload

// Boost (for linux/unix command-line execv)
#include <boost/tokenizer.hpp>
#include <boost/shared_ptr.hpp>

// External utility
#include <string>
#include <list>
#include <map>

#if LL_DARWIN
#include <CoreFoundation/CFURL.h>
#endif

// Static initialization
static const S32 PRIMARY_FLOATER = 1;
static const S32 SECONDARY_FLOATER = 2;

class LLOverlapPanel;
static LLDefaultChildRegistry::Register<LLOverlapPanel> register_overlap_panel("overlap_panel");

static std::string get_xui_dir()
{
	std::string delim = gDirUtilp->getDirDelimiter();
	return gDirUtilp->getSkinBaseDir() + delim + "default" + delim + "xui" + delim;
}

// Forward declarations to avoid header dependencies
class LLColor;
class LLScrollListCtrl;
class LLComboBox;
class LLButton;
class LLLineEditor;
class LLXmlTreeNode;
class LLFloaterUIPreview;
class LLFadeEventTimer;

class LLLocalizationResetForcer;
class LLGUIPreviewLiveFile;
class LLFadeEventTimer;
class LLPreviewedFloater;

// Implementation of custom overlapping element display panel
class LLOverlapPanel : public LLPanel
{
public:
	struct Params : public LLInitParam::Block<Params, LLPanel::Params>
	{
		Params() {}
	};
	LLOverlapPanel(Params p = Params()) : LLPanel(p),
		mSpacing(10),
		// mClickedElement(NULL),
		mLastClickedElement(NULL)
	{
		mOriginalWidth = getRect().getWidth();
		mOriginalHeight = getRect().getHeight();
	}
	virtual void draw();
	
	typedef std::map<LLView*, std::list<LLView*> >	OverlapMap;
	OverlapMap mOverlapMap;						// map, of XUI element to a list of XUI elements it overlaps
	
	// LLView *mClickedElement;
	LLView *mLastClickedElement;
	int mOriginalWidth, mOriginalHeight, mSpacing;
};


class LLFloaterUIPreview : public LLFloater
{
public:
	// Setup
	LLFloaterUIPreview(const LLSD& key);
	virtual ~LLFloaterUIPreview();

	std::string getLocStr(S32 ID);							// fetches the localization string based on what is selected in the drop-down menu
	void displayFloater(BOOL click, S32 ID, bool save = false);			// needs to be public so live file can call it when it finds an update

	/*virtual*/ BOOL postBuild();
	/*virtual*/ void onClose(bool app_quitting);

	void refreshList();										// refresh list (empty it out and fill it up from scratch)
	void addFloaterEntry(const std::string& path);			// add a single file's entry to the list of floaters
	
	static BOOL containerType(LLView* viewp);				// check if the element is a container type and tree traverses need to look at its children
	
public:	
	LLPreviewedFloater*			mDisplayedFloater;			// the floater which is currently being displayed
	LLPreviewedFloater*			mDisplayedFloater_2;			// the floater which is currently being displayed
	LLGUIPreviewLiveFile*		mLiveFile;					// live file for checking for updates to the currently-displayed XML file
	LLOverlapPanel*				mOverlapPanel;				// custom overlapping elements panel
	// BOOL						mHighlightingDiffs;			// bool for whether localization diffs are being highlighted or not
	BOOL						mHighlightingOverlaps;		// bool for whether overlapping elements are being highlighted

	// typedef std::map<std::string,std::pair<std::list<std::string>,std::list<std::string> > > DiffMap; // this version copies the lists etc., and thus is bad memory-wise
	typedef std::list<std::string> StringList;
	typedef boost::shared_ptr<StringList> StringListPtr;
	typedef std::map<std::string, std::pair<StringListPtr,StringListPtr> > DiffMap;
	DiffMap mDiffsMap;							// map, of filename to pair of list of changed element paths and list of errors

private:
	LLExternalEditor mExternalEditor;

	// XUI elements for this floater
	LLScrollListCtrl*			mFileList;							// scroll list control for file list
	LLLineEditor*				mEditorPathTextBox;					// text field for path to editor executable
	LLLineEditor*				mEditorArgsTextBox;					// text field for arguments to editor executable
	LLLineEditor*				mDiffPathTextBox;					// text field for path to diff file
	LLButton*					mDisplayFloaterBtn;					// button to display primary floater
	LLButton*					mDisplayFloaterBtn_2;				// button to display secondary floater
	LLButton*					mEditFloaterBtn;					// button to edit floater
	LLButton*					mExecutableBrowseButton;			// button to browse for executable
	LLButton*					mCloseOtherButton;					// button to close primary displayed floater
	LLButton*					mCloseOtherButton_2;				// button to close secondary displayed floater
	LLButton*					mDiffBrowseButton;					// button to browse for diff file
	LLButton*					mToggleHighlightButton;				// button to toggle highlight of files/elements with diffs
	LLButton*					mToggleOverlapButton;				// button to togle overlap panel/highlighting
	LLComboBox*					mLanguageSelection;					// combo box for primary language selection
	LLComboBox*					mLanguageSelection_2;				// combo box for secondary language selection
	LLScrollContainer*			mOverlapScrollView;					// overlapping elements scroll container
	S32							mLastDisplayedX, mLastDisplayedY;	// stored position of last floater so the new one opens up in the same place
	std::string 				mDelim;								// the OS-specific delimiter character (/ or \) (*TODO: this shouldn't be needed, right?)

	std::string					mSavedEditorPath;					// stored editor path so closing this floater doesn't reset it
	std::string					mSavedEditorArgs;					// stored editor args so closing this floater doesn't reset it
	std::string					mSavedDiffPath;						// stored diff file path so closing this floater doesn't reset it

	// Internal functionality
	static void popupAndPrintWarning(const std::string& warning);	// pop up a warning
	std::string getLocalizedDirectory();							// build and return the path to the XUI directory for the currently-selected localization
	void scanDiffFile(LLXmlTreeNode* file_node);					// scan a given XML node for diff entries and highlight them in its associated file
	void highlightChangedElements();								// look up the list of elements to highlight and highlight them in the current floater
	void highlightChangedFiles();									// look up the list of changed files to highlight and highlight them in the scroll list
	void findOverlapsInChildren(LLView* parent);					// fill the map below with element overlap information
	static BOOL overlapIgnorable(LLView* viewp);					// check it the element can be ignored for overlap/localization purposes

	// check if two elements overlap using their rectangles
	// used instead of llrect functions because by adding a few pixels of leeway I can cut down drastically on the number of overlaps
	BOOL elementOverlap(LLView* view1, LLView* view2);

	// Button/drop-down action listeners (self explanatory)
	void onClickDisplayFloater(S32 id);
	void onClickSaveFloater(S32 id);
	void onClickSaveAll(S32 id);
	void onClickEditFloater();
	void onClickBrowseForEditor();
	void onClickBrowseForDiffs();
	void onClickToggleDiffHighlighting();
	void onClickToggleOverlapping();
	void onClickCloseDisplayedFloater(S32 id);
	void onLanguageComboSelect(LLUICtrl* ctrl);
	void onClickExportSchema();
	void onClickShowRectangles(const LLSD& data);
};

//----------------------------------------------------------------------------
// Local class declarations
// Reset object to ensure that when we change the current language setting for preview purposes,
// it automatically is reset.  Constructed on the stack at the start of the method; the reset
// occurs as it falls out of scope at the end of the method.  See llfloateruipreview.cpp for usage.
class LLLocalizationResetForcer
{
public:
	LLLocalizationResetForcer(LLFloaterUIPreview* floater, S32 ID);
	virtual ~LLLocalizationResetForcer();

private:
	std::string mSavedLocalization;	// the localization before we change it
};

// Implementation of live file
// When a floater is being previewed, any saved changes to its corresponding
// file cause the previewed floater to be reloaded
class LLGUIPreviewLiveFile : public LLLiveFile
{
public:
	LLGUIPreviewLiveFile(std::string path, std::string name, LLFloaterUIPreview* parent);
	virtual ~LLGUIPreviewLiveFile();
	LLFloaterUIPreview* mParent;
	LLFadeEventTimer* mFadeTimer;	// timer for fade-to-yellow-and-back effect to warn that file has been reloaded
	BOOL mFirstFade;				// setting this avoids showing the fade reload warning on first load
	std::string mFileName;
protected:
	bool loadFile();
};

// Implementation of graphical fade in/out (on timer) for when XUI files are updated
class LLFadeEventTimer : public LLEventTimer
{
public:
	LLFadeEventTimer(F32 refresh, LLGUIPreviewLiveFile* parent);
	BOOL tick();
	LLGUIPreviewLiveFile* mParent;
private:
	BOOL mFadingOut;			// fades in then out; this is toggled in between
	LLColor4 mOriginalColor;	// original color; color is reset to this after fade is coimplete
};

// Implementation of previewed floater
// Used to override draw and mouse handler
class LLPreviewedFloater : public LLFloater
{
public:
	LLPreviewedFloater(LLFloaterUIPreview* floater, const Params& params)
		: LLFloater(LLSD(), params),
		  mFloaterUIPreview(floater)
	{
	}

	virtual void draw();
	BOOL handleRightMouseDown(S32 x, S32 y, MASK mask);
	BOOL handleToolTip(S32 x, S32 y, MASK mask);
	BOOL selectElement(LLView* parent, int x, int y, int depth);	// select element to display its overlappers

	LLFloaterUIPreview* mFloaterUIPreview;

	// draw widget outlines
	static bool	sShowRectangles;
};

bool LLPreviewedFloater::sShowRectangles = false;

//----------------------------------------------------------------------------

// Localization reset forcer -- ensures that when localization is temporarily changed for previewed floater, it is reset
// Changes are made here
LLLocalizationResetForcer::LLLocalizationResetForcer(LLFloaterUIPreview* floater, S32 ID)
{
	mSavedLocalization = LLUI::sSettingGroups["config"]->getString("Language");				// save current localization setting
	LLUI::sSettingGroups["config"]->setString("Language", floater->getLocStr(ID));// hack language to be the one we want to preview floaters in
	LLUI::setupPaths();														// forcibly reset XUI paths with this new language
}

// Actually reset in destructor
// Changes are reversed here
LLLocalizationResetForcer::~LLLocalizationResetForcer()
{
	LLUI::sSettingGroups["config"]->setString("Language", mSavedLocalization);	// reset language to what it was before we changed it
	LLUI::setupPaths();														// forcibly reset XUI paths with this new language
}

// Live file constructor
// Needs full path for LLLiveFile but needs just file name for this code, hence the reduntant arguments; easier than separating later
LLGUIPreviewLiveFile::LLGUIPreviewLiveFile(std::string path, std::string name, LLFloaterUIPreview* parent)
        : mFileName(name),
		mParent(parent),
		mFirstFade(TRUE),
		mFadeTimer(NULL),
		LLLiveFile(path, 1.0)
{}

LLGUIPreviewLiveFile::~LLGUIPreviewLiveFile()
{
	mParent->mLiveFile = NULL;
	if(mFadeTimer)
	{
		mFadeTimer->mParent = NULL;
		// deletes itself; see lltimer.cpp
	}
}

// Live file load
bool LLGUIPreviewLiveFile::loadFile()
{
	mParent->displayFloater(FALSE,1);	// redisplay the floater
	if(mFirstFade)	// only fade if it wasn't just clicked on; can't use "clicked" BOOL below because of an oddity with setting LLLiveFile initial state
	{
		mFirstFade = FALSE;
	}
	else
	{
		if(mFadeTimer)
		{
			mFadeTimer->mParent = NULL;
		}
		mFadeTimer = new LLFadeEventTimer(0.05f,this);
	}
	return true;
}

// Initialize fade event timer
LLFadeEventTimer::LLFadeEventTimer(F32 refresh, LLGUIPreviewLiveFile* parent)
	: mParent(parent),
	mFadingOut(TRUE),
	LLEventTimer(refresh)
{
	mOriginalColor = mParent->mParent->mDisplayedFloater->getBackgroundColor();
}

// Single tick of fade event timer: increment the color
BOOL LLFadeEventTimer::tick()
{
	float diff = 0.04f;
	if(TRUE == mFadingOut)	// set fade for in/out color direction
	{
		diff = -diff;
	}

	if(NULL == mParent)	// no more need to tick, so suicide
	{
		return TRUE;
	}

	// Set up colors
	LLColor4 bg_color = mParent->mParent->mDisplayedFloater->getBackgroundColor();
	LLSD colors = bg_color.getValue();
	LLSD colors_old = colors;

	// Tick colors
	colors[0] = colors[0].asReal() - diff; if(colors[0].asReal() < mOriginalColor.getValue()[0].asReal()) { colors[0] = colors_old[0]; }
	colors[1] = colors[1].asReal() - diff; if(colors[1].asReal() < mOriginalColor.getValue()[1].asReal()) { colors[1] = colors_old[1]; }
	colors[2] = colors[2].asReal() + diff; if(colors[2].asReal() > mOriginalColor.getValue()[2].asReal()) { colors[2] = colors_old[2]; }

	// Clamp and set colors
	bg_color.setValue(colors);
	bg_color.clamp();	// make sure we didn't exceed [0,1]
	mParent->mParent->mDisplayedFloater->setBackgroundColor(bg_color);

	if(bg_color[2] <= 0.0f)	// end of fade out, start fading in
	{
		mFadingOut = FALSE;
	}

	return FALSE;
}

// Constructor
LLFloaterUIPreview::LLFloaterUIPreview(const LLSD& key)
  : LLFloater(key),
	mDisplayedFloater(NULL),
	mDisplayedFloater_2(NULL),
	mLiveFile(NULL),
	// sHighlightingDiffs(FALSE),
	mHighlightingOverlaps(FALSE),
	mLastDisplayedX(0),
	mLastDisplayedY(0)
{
}

// Destructor
LLFloaterUIPreview::~LLFloaterUIPreview()
{
	// spawned floaters are deleted automatically, so we don't need to delete them here

	// save contents of textfields so it can be restored later if the floater is created again this session
	mSavedEditorPath = mEditorPathTextBox->getText();
	mSavedEditorArgs = mEditorArgsTextBox->getText();
	mSavedDiffPath   = mDiffPathTextBox->getText();

	// delete live file if it exists
	if(mLiveFile)
	{
		delete mLiveFile;
		mLiveFile = NULL;
	}
}

// Perform post-build setup (defined in superclass)
BOOL LLFloaterUIPreview::postBuild()
{
	LLPanel* main_panel_tmp = getChild<LLPanel>("main_panel");				// get a pointer to the main panel in order to...
	mFileList = main_panel_tmp->getChild<LLScrollListCtrl>("name_list");	// save pointer to file list
	// Double-click opens the floater, for convenience
	mFileList->setDoubleClickCallback(boost::bind(&LLFloaterUIPreview::onClickDisplayFloater, this, PRIMARY_FLOATER));

	setDefaultBtn("display_floater");
	// get pointers to buttons and link to callbacks
	mLanguageSelection = main_panel_tmp->getChild<LLComboBox>("language_select_combo");
	mLanguageSelection->setCommitCallback(boost::bind(&LLFloaterUIPreview::onLanguageComboSelect, this, mLanguageSelection));
	mLanguageSelection_2 = main_panel_tmp->getChild<LLComboBox>("language_select_combo_2");
	mLanguageSelection_2->setCommitCallback(boost::bind(&LLFloaterUIPreview::onLanguageComboSelect, this, mLanguageSelection));
	LLPanel* editor_panel_tmp = main_panel_tmp->getChild<LLPanel>("editor_panel");
	mDisplayFloaterBtn = main_panel_tmp->getChild<LLButton>("display_floater");
	mDisplayFloaterBtn->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickDisplayFloater, this, PRIMARY_FLOATER));
	mDisplayFloaterBtn_2 = main_panel_tmp->getChild<LLButton>("display_floater_2");
	mDisplayFloaterBtn_2->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickDisplayFloater, this, SECONDARY_FLOATER));
	mToggleOverlapButton = main_panel_tmp->getChild<LLButton>("toggle_overlap_panel");
	mToggleOverlapButton->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickToggleOverlapping, this));
	mCloseOtherButton = main_panel_tmp->getChild<LLButton>("close_displayed_floater");
	mCloseOtherButton->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickCloseDisplayedFloater, this, PRIMARY_FLOATER));
	mCloseOtherButton_2 = main_panel_tmp->getChild<LLButton>("close_displayed_floater_2");
	mCloseOtherButton_2->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickCloseDisplayedFloater, this, SECONDARY_FLOATER));
	mEditFloaterBtn = main_panel_tmp->getChild<LLButton>("edit_floater");
	mEditFloaterBtn->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickEditFloater, this));
	mExecutableBrowseButton = editor_panel_tmp->getChild<LLButton>("browse_for_executable");
	LLPanel* vlt_panel_tmp = main_panel_tmp->getChild<LLPanel>("vlt_panel");
	mExecutableBrowseButton->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickBrowseForEditor, this));
	mDiffBrowseButton = vlt_panel_tmp->getChild<LLButton>("browse_for_vlt_diffs");
	mDiffBrowseButton->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickBrowseForDiffs, this));
	mToggleHighlightButton = vlt_panel_tmp->getChild<LLButton>("toggle_vlt_diff_highlight");
	mToggleHighlightButton->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickToggleDiffHighlighting, this));
	main_panel_tmp->getChild<LLButton>("save_floater")->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickSaveFloater, this, PRIMARY_FLOATER));
	main_panel_tmp->getChild<LLButton>("save_all_floaters")->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickSaveAll, this, PRIMARY_FLOATER));

	getChild<LLButton>("export_schema")->setClickedCallback(boost::bind(&LLFloaterUIPreview::onClickExportSchema, this));
	getChild<LLUICtrl>("show_rectangles")->setCommitCallback(
		boost::bind(&LLFloaterUIPreview::onClickShowRectangles, this, _2));

	// get pointers to text fields
	mEditorPathTextBox = editor_panel_tmp->getChild<LLLineEditor>("executable_path_field");
	mEditorArgsTextBox = editor_panel_tmp->getChild<LLLineEditor>("executable_args_field");
	mDiffPathTextBox = vlt_panel_tmp->getChild<LLLineEditor>("vlt_diff_path_field");

	// *HACK: restored saved editor path and args to textfields
	mEditorPathTextBox->setText(mSavedEditorPath);
	mEditorArgsTextBox->setText(mSavedEditorArgs);
	mDiffPathTextBox->setText(mSavedDiffPath);

	// Set up overlap panel
	mOverlapPanel = getChild<LLOverlapPanel>("overlap_panel");

	getChildView("overlap_scroll")->setVisible( mHighlightingOverlaps);
	
	mDelim = gDirUtilp->getDirDelimiter();	// initialize delimiter to dir sep slash

	// refresh list of available languages (EN will still be default)
	BOOL found = TRUE;
	BOOL found_en_us = FALSE;
	std::string language_directory;
	std::string xui_dir = get_xui_dir();	// directory containing localizations -- don't forget trailing delim
	mLanguageSelection->removeall();																				// clear out anything temporarily in list from XML

	LLDirIterator iter(xui_dir, "*");
	while(found)																									// for every directory
	{
		if((found = iter.next(language_directory)))							// get next directory
		{
			std::string full_path = xui_dir + language_directory;
			if(LLFile::isfile(full_path.c_str()))																	// if it's not a directory, skip it
			{
				continue;
			}

			if(strncmp("template",language_directory.c_str(),8) && -1 == language_directory.find("."))				// if it's not the template directory or a hidden directory
			{
				if(!strncmp("en",language_directory.c_str(),5))													// remember if we've seen en, so we can make it default
				{
					found_en_us = TRUE;
				}
				else
				{
					mLanguageSelection->add(std::string(language_directory));											// add it to the language selection dropdown menu
					mLanguageSelection_2->add(std::string(language_directory));
				}
			}
		}
	}
	if(found_en_us)
	{
		mLanguageSelection->add(std::string("en"),ADD_TOP);															// make en first item if we found it
		mLanguageSelection_2->add(std::string("en"),ADD_TOP);	
	}
	else
	{
		std::string warning = std::string("No EN localization found; check your XUI directories!");
		popupAndPrintWarning(warning);
	}
	mLanguageSelection->selectFirstItem();																			// select the first item
	mLanguageSelection_2->selectFirstItem();

	refreshList();																									// refresh the list of available floaters

	return TRUE;
}

// Callback for language combo box selection: refresh current floater when you change languages
void LLFloaterUIPreview::onLanguageComboSelect(LLUICtrl* ctrl)
{
	LLComboBox* caller = dynamic_cast<LLComboBox*>(ctrl);
	if (!caller)
		return;
	if(caller->getName() == std::string("language_select_combo"))
	{
		if(mDisplayedFloater)
		{
			onClickCloseDisplayedFloater(PRIMARY_FLOATER);
			displayFloater(TRUE,1);
		}
	}
	else
	{
		if(mDisplayedFloater_2)
		{
			onClickCloseDisplayedFloater(PRIMARY_FLOATER);
			displayFloater(TRUE,2);	// *TODO: make take an arg
		}
	}

}

void LLFloaterUIPreview::onClickExportSchema()
{
	//NOTE: schema generation not complete
	//gViewerWindow->setCursor(UI_CURSOR_WAIT);
	//std::string template_path = gDirUtilp->getExpandedFilename(LL_PATH_DEFAULT_SKIN, "xui", "schema");

	//typedef LLWidgetTypeRegistry::Registrar::registry_map_t::const_iterator registry_it;
	//registry_it end_it = LLWidgetTypeRegistry::defaultRegistrar().endItems();
	//for(registry_it it = LLWidgetTypeRegistry::defaultRegistrar().beginItems();
	//	it != end_it;
	//	++it)
	//{
	//	std::string widget_name = it->first;
	//	const LLInitParam::BaseBlock& block = 
	//		(*LLDefaultParamBlockRegistry::instance().getValue(*LLWidgetTypeRegistry::instance().getValue(widget_name)))();
	//	LLXMLNodePtr root_nodep = new LLXMLNode();
	//	LLRNGWriter().writeRNG(widget_name, root_nodep, block, "http://www.lindenlab.com/xui");

	//	std::string file_name(template_path + gDirUtilp->getDirDelimiter() + widget_name + ".rng");

	//	LLFILE* rng_file = LLFile::fopen(file_name.c_str(), "w");
	//	{
	//		LLXMLNode::writeHeaderToFile(rng_file);
	//		const bool use_type_decorations = false;
	//		root_nodep->writeToFile(rng_file, std::string(), use_type_decorations);
	//	}
	//	fclose(rng_file);
	//}
	//gViewerWindow->setCursor(UI_CURSOR_ARROW);
}

void LLFloaterUIPreview::onClickShowRectangles(const LLSD& data)
{
	LLPreviewedFloater::sShowRectangles = data.asBoolean();
}

// Close click handler -- delete my displayed floater if it exists
void LLFloaterUIPreview::onClose(bool app_quitting)
{
	if(!app_quitting && mDisplayedFloater)
	{
		onClickCloseDisplayedFloater(PRIMARY_FLOATER);
		onClickCloseDisplayedFloater(SECONDARY_FLOATER);
		delete mDisplayedFloater;
		mDisplayedFloater = NULL;
		delete mDisplayedFloater_2;
		mDisplayedFloater_2 = NULL;
	}
}

// Error handling (to avoid code repetition)
// *TODO: this is currently unlocalized.  Add to alerts/notifications.xml, someday, maybe.
void LLFloaterUIPreview::popupAndPrintWarning(const std::string& warning)
{
	llwarns << warning << llendl;
	LLSD args;
	args["MESSAGE"] = warning;
	LLNotificationsUtil::add("GenericAlert", args);
}

// Get localization string from drop-down menu
std::string LLFloaterUIPreview::getLocStr(S32 ID)
{
	if(ID == 1)
	{
		return mLanguageSelection->getSelectedItemLabel(0);
	}
	else
	{
		return mLanguageSelection_2->getSelectedItemLabel(0);
	}
}

// Get localized directory (build path from data directory to XUI files, substituting localization string in for language)
std::string LLFloaterUIPreview::getLocalizedDirectory()
{
	return get_xui_dir() + (getLocStr(1)) + mDelim; // e.g. "C:/Code/guipreview/indra/newview/skins/xui/en/";
}

// Refresh the list of floaters by doing a directory traverse for XML XUI floater files
// Could be used to grab any specific language's list of compatible floaters, but currently it's just used to get all of them
void LLFloaterUIPreview::refreshList()
{
	// Note: the mask doesn't seem to accept regular expressions, so there need to be two directory searches here
	mFileList->clearRows();		// empty list
	std::string name;
	BOOL found = TRUE;

	LLDirIterator floater_iter(getLocalizedDirectory(), "floater_*.xml");
	while(found)				// for every floater file that matches the pattern
	{
		if((found = floater_iter.next(name)))	// get next file matching pattern
		{
			addFloaterEntry(name.c_str());	// and add it to the list (file name only; localization code takes care of rest of path)
		}
	}
	found = TRUE;

	LLDirIterator inspect_iter(getLocalizedDirectory(), "inspect_*.xml");
	while(found)				// for every inspector file that matches the pattern
	{
		if((found = inspect_iter.next(name)))	// get next file matching pattern
		{
			addFloaterEntry(name.c_str());	// and add it to the list (file name only; localization code takes care of rest of path)
		}
	}
	found = TRUE;

	LLDirIterator menu_iter(getLocalizedDirectory(), "menu_*.xml");
	while(found)				// for every menu file that matches the pattern
	{
		if((found = menu_iter.next(name)))	// get next file matching pattern
		{
			addFloaterEntry(name.c_str());	// and add it to the list (file name only; localization code takes care of rest of path)
		}
	}
	found = TRUE;

	LLDirIterator panel_iter(getLocalizedDirectory(), "panel_*.xml");
	while(found)				// for every panel file that matches the pattern
	{
		if((found = panel_iter.next(name)))	// get next file matching pattern
		{
			addFloaterEntry(name.c_str());	// and add it to the list (file name only; localization code takes care of rest of path)
		}
	}
	found = TRUE;

	LLDirIterator sidepanel_iter(getLocalizedDirectory(), "sidepanel_*.xml");
	while(found)				// for every sidepanel file that matches the pattern
	{
		if((found = sidepanel_iter.next(name)))	// get next file matching pattern
		{
			addFloaterEntry(name.c_str());	// and add it to the list (file name only; localization code takes care of rest of path)
		}
	}

	if(!mFileList->isEmpty())	// if there were any matching files, just select the first one (so we don't have to worry about disabling buttons when no entry is selected)
	{
		mFileList->selectFirstItem();
	}
}

// Add a single entry to the list of available floaters
// Note: no deduplification (shouldn't be necessary)
void LLFloaterUIPreview::addFloaterEntry(const std::string& path)
{
	LLUUID* entry_id = new LLUUID();				// create a new UUID
	entry_id->generate(path);
	const LLUUID& entry_id_ref = *entry_id;			// get a reference to the UUID for the LLSD block

	// fill LLSD column entry: initialize row/col structure
	LLSD row;
	row["id"] = entry_id_ref;
	LLSD& columns = row["columns"];

	// Get name of floater:
	LLXmlTree xml_tree;
	std::string full_path = getLocalizedDirectory() + path;			// get full path
	BOOL success = xml_tree.parseFile(full_path.c_str(), TRUE);		// parse xml
	std::string entry_name;
	std::string entry_title;
	if(success)
	{
		// get root (or error handle)
		LLXmlTreeNode* root_floater = xml_tree.getRoot();
		if (!root_floater)
		{
			std::string warning = std::string("No root node found in XUI file: ") + path;
			popupAndPrintWarning(warning);
			return;
		}

		// get name
		root_floater->getAttributeString("name",entry_name);
		if(std::string("") == entry_name)
		{
			entry_name = "Error: unable to load " + std::string(path);	// set to error state if load fails
		}

		// get title
		root_floater->getAttributeString("title",entry_title); // some don't have a title, and some have title = "(unknown)", so just leave it blank if it fails
	}
	else
	{
		std::string warning = std::string("Unable to parse XUI file: ") + path;	// error handling
		popupAndPrintWarning(warning);
		if(mLiveFile)
		{
			delete mLiveFile;
			mLiveFile = NULL;
		}
		return;
	}

	// Fill floater title column
	columns[0]["column"] = "title_column";
	columns[0]["type"] = "text";
	columns[0]["value"] = entry_title;

	// Fill floater path column
	columns[1]["column"] = "file_column";
	columns[1]["type"] = "text";
	columns[1]["value"] = std::string(path);

	// Fill floater name column
	columns[2]["column"] = "top_level_node_column";
	columns[2]["type"] = "text";
	columns[2]["value"] = entry_name;

	mFileList->addElement(row);		// actually add to list
}

// Respond to button click to display/refresh currently-selected floater
void LLFloaterUIPreview::onClickDisplayFloater(S32 caller_id)
{
	displayFloater(TRUE, caller_id);
}

// Saves the current floater/panel
void LLFloaterUIPreview::onClickSaveFloater(S32 caller_id)
{
	displayFloater(TRUE, caller_id, true);
}

// Saves all floater/panels
void LLFloaterUIPreview::onClickSaveAll(S32 caller_id)
{
	int listSize = mFileList->getItemCount();

	for (int index = 0; index < listSize; index++)
	{
		mFileList->selectNthItem(index);
		displayFloater(TRUE, caller_id, true);
	}
}

// Given path to floater or panel XML file "filename.xml",
// returns "filename_new.xml"
static std::string append_new_to_xml_filename(const std::string& path)
{
	std::string full_filename = gDirUtilp->findSkinnedFilename(LLUI::getLocalizedSkinPath(), path);
	std::string::size_type extension_pos = full_filename.rfind(".xml");
	full_filename.resize(extension_pos);
	full_filename += "_new.xml";
	return full_filename;
}

// Actually display the floater
// Only set up a new live file if this came from a click (at which point there should be no existing live file), rather than from the live file's update itself;
// otherwise, we get an infinite loop as the live file keeps recreating itself.  That means this function is generally called twice.
void LLFloaterUIPreview::displayFloater(BOOL click, S32 ID, bool save)
{
	// Convince UI that we're in a different language (the one selected on the drop-down menu)
	LLLocalizationResetForcer reset_forcer(this, ID);						// save old language in reset forcer object (to be reset upon destruction when it falls out of scope)

	LLPreviewedFloater** floaterp = (ID == 1 ? &(mDisplayedFloater) : &(mDisplayedFloater_2));
	if(ID == 1)
	{
		BOOL floater_already_open = mDisplayedFloater != NULL;
		if(floater_already_open)											// if we are already displaying a floater
		{
			mLastDisplayedX = mDisplayedFloater->calcScreenRect().mLeft;	// save floater's last known position to put the new one there
			mLastDisplayedY = mDisplayedFloater->calcScreenRect().mBottom;
			delete mDisplayedFloater;							// delete it (this closes it too)
			mDisplayedFloater = NULL;							// and reset the pointer
		}
	}
	else
	{
		if(mDisplayedFloater_2 != NULL)
		{
			delete mDisplayedFloater_2;
			mDisplayedFloater_2 = NULL;
		}
	}

	std::string path = mFileList->getSelectedItemLabel(1);		// get the path of the currently-selected floater
	if(std::string("") == path)											// if no item is selected
	{
		return;															// ignore click (this can only happen with empty list; otherwise an item is always selected)
	}

	LLFloater::Params p(LLFloater::getDefaultParams());
	p.min_height=p.header_height;
	p.min_width=10;

	*floaterp = new LLPreviewedFloater(this, p);

	if(!strncmp(path.c_str(),"floater_",8)
		|| !strncmp(path.c_str(), "inspect_", 8))		// if it's a floater
	{
		if (save)
		{
			LLXMLNodePtr floater_write = new LLXMLNode();			
			(*floaterp)->buildFromFile(path, floater_write);	// just build it

			if (!floater_write->isNull())
			{
				std::string full_filename = append_new_to_xml_filename(path);
				LLFILE* floater_temp = LLFile::fopen(full_filename.c_str(), "w");
				LLXMLNode::writeHeaderToFile(floater_temp);
				const bool use_type_decorations = false;
				floater_write->writeToFile(floater_temp, std::string(), use_type_decorations);
				fclose(floater_temp);
			}
		}
		else
		{
			(*floaterp)->buildFromFile(path);	// just build it
			(*floaterp)->openFloater((*floaterp)->getKey());
			(*floaterp)->setCanResize((*floaterp)->isResizable());
		}

	}
	else if (!strncmp(path.c_str(),"menu_",5))								// if it's a menu
	{
		if (save)
		{	
			LLXMLNodePtr menu_write = new LLXMLNode();	
			LLMenuGL* menu = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>(path, gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance(), menu_write);

			if (!menu_write->isNull())
			{
				std::string full_filename = append_new_to_xml_filename(path);
				LLFILE* menu_temp = LLFile::fopen(full_filename.c_str(), "w");
				LLXMLNode::writeHeaderToFile(menu_temp);
				const bool use_type_decorations = false;
				menu_write->writeToFile(menu_temp, std::string(), use_type_decorations);
				fclose(menu_temp);
			}

			delete menu;
		}
	}
	else																// if it is a panel...
	{
		(*floaterp)->setCanResize(true);

		const LLFloater::Params& floater_params = LLFloater::getDefaultParams();
		S32 floater_header_size = floater_params.header_height;

		LLPanel::Params panel_params;
		LLPanel* panel = LLUICtrlFactory::create<LLPanel>(panel_params);	// create a new panel

		if (save)
		{
			LLXMLNodePtr panel_write = new LLXMLNode();
			panel->buildFromFile(path, panel_write);		// build it
			
			if (!panel_write->isNull())
			{
				std::string full_filename = append_new_to_xml_filename(path);
				LLFILE* panel_temp = LLFile::fopen(full_filename.c_str(), "w");
				LLXMLNode::writeHeaderToFile(panel_temp);
				const bool use_type_decorations = false;
				panel_write->writeToFile(panel_temp, std::string(), use_type_decorations);
				fclose(panel_temp);
			}
		}
		else
		{
			panel->buildFromFile(path);										// build it
			LLRect new_size = panel->getRect();								// get its rectangle
			panel->setOrigin(2,2);											// reset its origin point so it's not offset by -left or other XUI attributes
			(*floaterp)->setTitle(path);									// use the file name as its title, since panels have no guaranteed meaningful name attribute
			panel->setUseBoundingRect(TRUE);								// enable the use of its outer bounding rect (normally disabled because it's O(n) on the number of sub-elements)
			panel->updateBoundingRect();									// update bounding rect
			LLRect bounding_rect = panel->getBoundingRect();				// get the bounding rect
			LLRect new_rect = panel->getRect();								// get the panel's rect
			new_rect.unionWith(bounding_rect);								// union them to make sure we get the biggest one possible
			LLRect floater_rect = new_rect;
			floater_rect.stretch(4, 4);
			(*floaterp)->reshape(floater_rect.getWidth(), floater_rect.getHeight() + floater_header_size);	// reshape floater to match the union rect's dimensions
			panel->reshape(new_rect.getWidth(), new_rect.getHeight());		// reshape panel to match the union rect's dimensions as well (both are needed)
			(*floaterp)->addChild(panel);					// add panel as child
			(*floaterp)->openFloater();						// open floater (needed?)
		}
	}

	if(ID == 1)
	{
		(*floaterp)->setOrigin(mLastDisplayedX, mLastDisplayedY);
	}

	// *HACK: Remove ability to close it; if you close it, its destructor gets called, but we don't know it's null and try to delete it again,
	// resulting in a double free
	(*floaterp)->setCanClose(FALSE);
	
	if(ID == 1)
	{
		mCloseOtherButton->setEnabled(TRUE);	// enable my floater's close button
	}
	else
	{
		mCloseOtherButton_2->setEnabled(TRUE);
	}

	// Add localization to title so user knows whether it's localized or defaulted to en
	std::string full_path = getLocalizedDirectory() + path;
	std::string floater_lang = "EN";
	llstat dummy;
	if(!LLFile::stat(full_path.c_str(), &dummy))	// if the file does not exist
	{
		floater_lang = getLocStr(ID);
	}
	std::string new_title = (*floaterp)->getTitle() + std::string(" [") + floater_lang +
						(ID == 1 ? " - Primary" : " - Secondary") + std::string("]");
	(*floaterp)->setTitle(new_title);

	(*floaterp)->center();
	addDependentFloater(*floaterp);

	if(click && ID == 1 && !save)
	{
		// set up live file to track it
		if(mLiveFile)
		{
			delete mLiveFile;
			mLiveFile = NULL;
		}
		mLiveFile = new LLGUIPreviewLiveFile(std::string(full_path.c_str()),std::string(path.c_str()),this);
		mLiveFile->checkAndReload();
		mLiveFile->addToEventTimer();
	}

	if(ID == 1)
	{
		mToggleOverlapButton->setEnabled(TRUE);
	}

	if(LLView::sHighlightingDiffs && click && ID == 1)
	{
		highlightChangedElements();
	}

	if(ID == 1)
	{
		mOverlapPanel->mOverlapMap.clear();
		LLView::sPreviewClickedElement = NULL;	// stop overlapping elements from drawing
		mOverlapPanel->mLastClickedElement = NULL;
		findOverlapsInChildren((LLView*)mDisplayedFloater);

		// highlight and enable them
		if(mHighlightingOverlaps)
		{
			for(LLOverlapPanel::OverlapMap::iterator iter = mOverlapPanel->mOverlapMap.begin(); iter != mOverlapPanel->mOverlapMap.end(); ++iter)
			{
				LLView* viewp = iter->first;
				LLView::sPreviewHighlightedElements.insert(viewp);
			}
		}
		else if(LLView::sHighlightingDiffs)
		{
			highlightChangedElements();
		}
	}

	// NOTE: language is reset here automatically when the reset forcer object falls out of scope (see header for details)
}

// Respond to button click to edit currently-selected floater
void LLFloaterUIPreview::onClickEditFloater()
{
	// Determine file to edit.
	std::string file_path;
	{
		std::string file_name = mFileList->getSelectedItemLabel(1);	// get the file name of the currently-selected floater
		if (file_name.empty())					// if no item is selected
		{
			llwarns << "No file selected" << llendl;
			return;															// ignore click
		}
		file_path = getLocalizedDirectory() + file_name;

		// stat file to see if it exists (some localized versions may not have it there are no diffs, and then we try to open an nonexistent file)
		llstat dummy;
		if(LLFile::stat(file_path.c_str(), &dummy))								// if the file does not exist
		{
			popupAndPrintWarning("No file for this floater exists in the selected localization.  Opening the EN version instead.");
			file_path = get_xui_dir() + mDelim + "en" + mDelim + file_name; // open the en version instead, by default
		}
	}

	// Set the editor command.
	std::string cmd_override;
	{
		std::string bin = mEditorPathTextBox->getText();
		if (!bin.empty())
		{
			// surround command with double quotes for the case if the path contains spaces
			if (bin.find("\"") == std::string::npos)
			{
				bin = "\"" + bin + "\"";
			}

			std::string args = mEditorArgsTextBox->getText();
			cmd_override = bin + " " + args;
		}
	}

	LLExternalEditor::EErrorCode status = mExternalEditor.setCommand("LL_XUI_EDITOR", cmd_override);
	if (status != LLExternalEditor::EC_SUCCESS)
	{
		std::string warning;

		if (status == LLExternalEditor::EC_NOT_SPECIFIED) // Use custom message for this error.
		{
			warning = getString("ExternalEditorNotSet");
		}
		else
		{
			warning = LLExternalEditor::getErrorMessage(status);
		}

		popupAndPrintWarning(warning);
		return;
	}

	// Run the editor.
	if (mExternalEditor.run(file_path) != LLExternalEditor::EC_SUCCESS)
	{
		popupAndPrintWarning(LLExternalEditor::getErrorMessage(status));
		return;
	}
}

// Respond to button click to browse for an executable with which to edit XML files
void LLFloaterUIPreview::onClickBrowseForEditor()
{
	// create load dialog box
	LLFilePicker::ELoadFilter type = (LLFilePicker::ELoadFilter)((intptr_t)((void*)LLFilePicker::FFLOAD_ALL));	// nothing for *.exe so just use all
	LLFilePicker& picker = LLFilePicker::instance();
	if (!picker.getOpenFile(type))	// user cancelled -- do nothing
	{
		return;
	}

	// put the selected path into text field
	const std::string chosen_path = picker.getFirstFile();
	std::string executable_path = chosen_path;
#if LL_DARWIN
	// on Mac, if it's an application bundle, figure out the actual path from the Info.plist file
	CFStringRef path_cfstr = CFStringCreateWithCString(kCFAllocatorDefault, chosen_path.c_str(), kCFStringEncodingMacRoman);		// get path as a CFStringRef
	CFURLRef path_url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, path_cfstr, kCFURLPOSIXPathStyle, TRUE);			// turn it into a CFURLRef
	CFBundleRef chosen_bundle = CFBundleCreate(kCFAllocatorDefault, path_url);												// get a handle for the bundle
	if(NULL != chosen_bundle)
	{
		CFDictionaryRef bundleInfoDict = CFBundleGetInfoDictionary(chosen_bundle);												// get the bundle's dictionary
		if(NULL != bundleInfoDict)
		{
			CFStringRef executable_cfstr = (CFStringRef)CFDictionaryGetValue(bundleInfoDict, CFSTR("CFBundleExecutable"));	// get the name of the actual executable (e.g. TextEdit or firefox-bin)
			int max_file_length = 256;																						// (max file name length is 255 in OSX)
			char executable_buf[max_file_length];
			if(CFStringGetCString(executable_cfstr, executable_buf, max_file_length, kCFStringEncodingMacRoman))			// convert CFStringRef to char*
			{
				executable_path += std::string("/Contents/MacOS/") + std::string(executable_buf);							// append path to executable directory and then executable name to exec path
			}
			else
			{
				std::string warning = "Unable to get CString from CFString for executable path";
				popupAndPrintWarning(warning);
			}
		}
		else
		{
			std::string warning = "Unable to get bundle info dictionary from application bundle";
			popupAndPrintWarning(warning);
		}
	}
	else
	{
		if(-1 != executable_path.find(".app"))	// only warn if this path actually had ".app" in it, i.e. it probably just wasn'nt an app bundle and that's okay
		{
			std::string warning = std::string("Unable to get bundle from path \"") + chosen_path + std::string("\"");
			popupAndPrintWarning(warning);
		}
	}

#endif
	mEditorPathTextBox->setText(std::string(executable_path));	// copy the path to the executable to the textfield for display and later fetching
}

// Respond to button click to browse for a VLT-generated diffs file
void LLFloaterUIPreview::onClickBrowseForDiffs()
{
	// create load dialog box
	LLFilePicker::ELoadFilter type = (LLFilePicker::ELoadFilter)((intptr_t)((void*)LLFilePicker::FFLOAD_XML));	// nothing for *.exe so just use all
	LLFilePicker& picker = LLFilePicker::instance();
	if (!picker.getOpenFile(type))	// user cancelled -- do nothing
	{
		return;
	}

	// put the selected path into text field
	const std::string chosen_path = picker.getFirstFile();
	mDiffPathTextBox->setText(std::string(chosen_path));	// copy the path to the executable to the textfield for display and later fetching
	if(LLView::sHighlightingDiffs)								// if we're already highlighting, toggle off and then on so we get the data from the new file
	{
		onClickToggleDiffHighlighting();
		onClickToggleDiffHighlighting();
	}
}

void LLFloaterUIPreview::onClickToggleDiffHighlighting()
{
	if(mHighlightingOverlaps)
	{
		onClickToggleOverlapping();
		mToggleOverlapButton->toggleState();
	}

	LLView::sPreviewHighlightedElements.clear();	// clear lists first
	mDiffsMap.clear();
	mFileList->clearHighlightedItems();

	if(LLView::sHighlightingDiffs)				// Turning highlighting off
	{
		LLView::sHighlightingDiffs = !sHighlightingDiffs;
		return;
	}
	else											// Turning highlighting on
	{
		// Get the file and make sure it exists
		std::string path_in_textfield = mDiffPathTextBox->getText();	// get file path
		BOOL error = FALSE;

		if(std::string("") == path_in_textfield)									// check for blank file
		{
			std::string warning = "Unable to highlight differences because no file was provided; fill in the relevant text field";
			popupAndPrintWarning(warning);
			error = TRUE;
		}

		llstat dummy;
		if(LLFile::stat(path_in_textfield.c_str(), &dummy) && !error)			// check if the file exists (empty check is reduntant but useful for the informative error message)
		{
			std::string warning = std::string("Unable to highlight differences because an invalid path to a difference file was provided:\"") + path_in_textfield + "\"";
			popupAndPrintWarning(warning);
			error = TRUE;
		}

		// Build a list of changed elements as given by the XML
		std::list<std::string> changed_element_names;
		LLXmlTree xml_tree;
		BOOL success = xml_tree.parseFile(path_in_textfield.c_str(), TRUE);

		if(success && !error)
		{
			LLXmlTreeNode* root_floater = xml_tree.getRoot();
			if(!strncmp("XuiDelta",root_floater->getName().c_str(),9))
			{
				for (LLXmlTreeNode* child = root_floater->getFirstChild();		// get the first child first, then below get the next one; otherwise the iterator is invalid (bug or feature in XML code?)
					 child != NULL;
 					 child = root_floater->getNextChild())	// get child for next iteration
				{
					if(!strncmp("file",child->getName().c_str(),5))
					{
						scanDiffFile(child);
					}
					else if(!strncmp("error",child->getName().c_str(),6))
					{
						std::string error_file, error_message;
						child->getAttributeString("filename",error_file);
						child->getAttributeString("message",error_message);
						if(mDiffsMap.find(error_file) != mDiffsMap.end())
						{
							mDiffsMap.insert(std::make_pair(error_file,std::make_pair(StringListPtr(new StringList), StringListPtr(new StringList))));
						}
						mDiffsMap[error_file].second->push_back(error_message);
					}
					else
					{
						std::string warning = std::string("Child was neither a file or an error, but rather the following:\"") + std::string(child->getName()) + "\"";
						popupAndPrintWarning(warning);
						error = TRUE;
						break;
					}
				}
			}
			else
			{
				std::string warning = std::string("Root node not named XuiDelta:\"") + path_in_textfield + "\"";
				popupAndPrintWarning(warning);
				error = TRUE;
			}
		}
		else if(!error)
		{
			std::string warning = std::string("Unable to create tree from XML:\"") + path_in_textfield + "\"";
			popupAndPrintWarning(warning);
			error = TRUE;
		}

		if(error)	// if we encountered an error, reset the button to off
		{
			mToggleHighlightButton->setToggleState(FALSE);		
		}
		else		// only toggle if we didn't encounter an error
		{
			LLView::sHighlightingDiffs = !sHighlightingDiffs;
			highlightChangedElements();		// *TODO: this is extraneous, right?
			highlightChangedFiles();			// *TODO: this is extraneous, right?
		}
	}
}

void LLFloaterUIPreview::scanDiffFile(LLXmlTreeNode* file_node)
{
	// Get file name
	std::string file_name;
	file_node->getAttributeString("name",file_name);
	if(std::string("") == file_name)
	{
		std::string warning = std::string("Empty file name encountered in differences:\"") + file_name + "\"";
		popupAndPrintWarning(warning);
		return;
	}

	// Get a list of changed elements
	// Get the first child first, then below get the next one; otherwise the iterator is invalid (bug or feature in XML code?)
	for (LLXmlTreeNode* child = file_node->getFirstChild(); child != NULL; child = file_node->getNextChild())
	{
		if(!strncmp("delta",child->getName().c_str(),6))
		{
			std::string id;
			child->getAttributeString("id",id);
			if(mDiffsMap.find(file_name) == mDiffsMap.end())
			{
				mDiffsMap.insert(std::make_pair(file_name,std::make_pair(StringListPtr(new StringList), StringListPtr(new StringList))));
			}
			mDiffsMap[file_name].first->push_back(std::string(id.c_str()));
		}
		else
		{
			std::string warning = std::string("Child of file was not a delta, but rather the following:\"") + std::string(child->getName()) + "\"";
			popupAndPrintWarning(warning);
			return;
		}
	}
}

void LLFloaterUIPreview::highlightChangedElements()
{
	if(NULL == mLiveFile)
	{
		return;
	}

	// Process differences first (we want their warnings to be shown underneath other warnings)
	StringListPtr changed_element_paths;
	DiffMap::iterator iterExists = mDiffsMap.find(mLiveFile->mFileName);
	if(iterExists != mDiffsMap.end())
	{
		changed_element_paths = mDiffsMap[mLiveFile->mFileName].first;		// retrieve list of changed element paths from map
	}

	for(std::list<std::string>::iterator iter = changed_element_paths->begin(); iter != changed_element_paths->end(); ++iter)	// for every changed element path
	{
		LLView* element = mDisplayedFloater;
		if(!strncmp(iter->c_str(),".",1))	// if it's the root floater itself
		{
			continue;
		}

		// Split element hierarchy path on period (*HACK: it's possible that the element name will have a period in it, in which case this won't work.  See https://wiki.lindenlab.com/wiki/Viewer_Localization_Tool_Documentation.)
		typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
		boost::char_separator<char> sep(".");
		tokenizer tokens(*iter, sep);
		tokenizer::iterator token_iter;
		BOOL failed = FALSE;
		for(token_iter = tokens.begin(); token_iter != tokens.end(); ++token_iter)
		{
			element = element->findChild<LLView>(*token_iter,FALSE);	// try to find element: don't recur, and don't create if missing

			// if we still didn't find it...
			if(NULL == element)												
			{
				llinfos << "Unable to find element in XuiDelta file named \"" << *iter << "\" in file \"" << mLiveFile->mFileName <<
							"\". The element may no longer exist, the path may be incorrect, or it may not be a non-displayable element…