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diff --git a/indra/llui/llemojihelper.h b/indra/llui/llemojihelper.h
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+++ b/indra/llui/llemojihelper.h
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+/**
+* @file llemojihelper.h
+* @brief Header file for LLEmojiHelper
+*
+* $LicenseInfo:firstyear=2014&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2014, 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
+* $/LicenseInfo$
+*/
+
+#pragma once
+
+#include "llhandle.h"
+#include "llsingleton.h"
+
+#include <boost/signals2.hpp>
+
+class LLFloater;
+class LLUICtrl;
+
+class LLEmojiHelper : public LLSingleton<LLEmojiHelper>
+{
+	LLSINGLETON(LLEmojiHelper) {}
+	~LLEmojiHelper() override {}
+
+public:
+	// General
+	std::string getToolTip(llwchar ch) const;
+	bool        isActive(const LLUICtrl* ctrl_p) const;
+	static bool isCursorInEmojiCode(const LLWString& wtext, S32 cursor_pos, S32* short_code_pos_p = nullptr);
+	void        showHelper(LLUICtrl* hostctrl_p, S32 local_x, S32 local_y, const std::string& short_code, std::function<void(LLWString)> commit_cb);
+	void        hideHelper(const LLUICtrl* ctrl_p);
+
+	// Eventing
+	bool handleKey(const LLUICtrl* ctrl_p, KEY key, MASK mask);
+	void onCommitEmoji(const LLWString& wstr);
+
+protected:
+	LLUICtrl* getHostCtrl() const { return mHostHandle.get(); }
+	void      setHostCtrl(LLUICtrl* hostctrl_p);
+
+private:
+	LLHandle<LLUICtrl>  mHostHandle;
+	LLHandle<LLFloater> mHelperHandle;
+	boost::signals2::connection mHostCtrlFocusLostConn;
+	boost::signals2::connection mHelperCommitConn;
+	std::function<void(LLWString)> mEmojiCommitCb;
+};