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diff --git a/indra/newview/llfloateremojipicker.h b/indra/newview/llfloateremojipicker.h
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+++ b/indra/newview/llfloateremojipicker.h
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+/**
+ * @file llfloateremojipicker.h
+ * @brief Header file for llfloateremojipicker
+ *
+ * $LicenseInfo:firstyear=2003&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
+ */
+
+#ifndef LLFLOATEREMOJIPICKER_H
+#define LLFLOATEREMOJIPICKER_H
+
+#include "llfloater.h"
+
+class LLEmojiGridRow;
+class LLEmojiGridIcon;
+struct LLEmojiDescriptor;
+struct LLEmojiSearchResult;
+
+class LLFloaterEmojiPicker : public LLFloater
+{
+    using super = LLFloater;
+
+public:
+    // The callback function will be called with an emoji char.
+    typedef boost::function<void (llwchar)> pick_callback_t;
+    typedef boost::function<void ()> close_callback_t;
+
+    LLFloaterEmojiPicker(const LLSD& key);
+
+    virtual	BOOL postBuild() override;
+    virtual void dirtyRect() override;
+    virtual void goneFromFront() override;
+
+    void hideFloater() const;
+
+    static std::list<llwchar>& getRecentlyUsed();
+    static void onEmojiUsed(llwchar emoji);
+
+    static void loadState();
+    static void saveState();
+
+private:
+    void initialize();
+    void fillGroups();
+    void fillCategoryRecentlyUsed(std::map<std::string, std::vector<LLEmojiSearchResult>>& cats);
+    void fillCategoryFrequentlyUsed(std::map<std::string, std::vector<LLEmojiSearchResult>>& cats);
+    void fillGroupEmojis(std::map<std::string, std::vector<LLEmojiSearchResult>>& cats, U32 index);
+    void createGroupButton(LLButton::Params& params, const LLRect& rect, llwchar emoji);
+    void resizeGroupButtons();
+    void selectEmojiGroup(U32 index);
+    void fillEmojis(bool fromResize = false);
+    void fillEmojisCategory(const std::vector<LLEmojiSearchResult>& emojis,
+        const std::string& category, const LLPanel::Params& row_panel_params, const LLUICtrl::Params& row_list_params,
+        const LLPanel::Params& icon_params, const LLRect& icon_rect, S32 max_icons, const LLColor4& bg);
+    void createEmojiIcon(const LLEmojiSearchResult& emoji,
+        const std::string& category, const LLPanel::Params& row_panel_params, const LLUICtrl::Params& row_list_params,
+        const LLPanel::Params& icon_params, const LLRect& icon_rect, S32 max_icons, const LLColor4& bg,
+        LLEmojiGridRow*& row, int& icon_index);
+    void showPreview(bool show);
+
+    void onGroupButtonClick(LLUICtrl* ctrl);
+    void onGroupButtonMouseEnter(LLUICtrl* ctrl);
+    void onGroupButtonMouseLeave(LLUICtrl* ctrl);
+    void onEmojiMouseEnter(LLUICtrl* ctrl);
+    void onEmojiMouseLeave(LLUICtrl* ctrl);
+    void onEmojiMouseDown(LLUICtrl* ctrl);
+    void onEmojiMouseUp(LLUICtrl* ctrl);
+
+    void selectFocusedIcon();
+    bool moveFocusedIconUp();
+    bool moveFocusedIconDown();
+    bool moveFocusedIconPrev();
+    bool moveFocusedIconNext();
+
+    void selectGridIcon(LLEmojiGridIcon* icon);
+    void unselectGridIcon(LLEmojiGridIcon* icon);
+
+    void onOpen(const LLSD& key) override;
+    virtual BOOL handleKey(KEY key, MASK mask, BOOL called_from_parent) override;
+
+    class LLPanel* mGroups { nullptr };
+    class LLPanel* mBadge { nullptr };
+    class LLScrollContainer* mEmojiScroll { nullptr };
+    class LLScrollingPanelList* mEmojiGrid { nullptr };
+    class LLEmojiPreviewPanel* mPreview { nullptr };
+    class LLTextBox* mDummy { nullptr };
+
+    std::vector<S32> mFilteredEmojiGroups;
+    std::vector<std::map<std::string, std::vector<LLEmojiSearchResult>>> mFilteredEmojis;
+    std::vector<class LLButton*> mGroupButtons;
+
+    std::string mHint;
+    std::string mFilterPattern;
+    U32 mSelectedGroupIndex { 0 };
+    S32 mRecentMaxIcons { 0 };
+    S32 mFocusedIconRow { 0 };
+    S32 mFocusedIconCol { 0 };
+    LLEmojiGridIcon* mFocusedIcon { nullptr };
+    LLEmojiGridIcon* mHoveredIcon { nullptr };
+
+    U64 mRecentReturnPressedMs { 0 };
+};
+
+#endif