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diff --git a/linden/indra/llwindow/llmousehandler.h b/linden/indra/llwindow/llmousehandler.h
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+++ b/linden/indra/llwindow/llmousehandler.h
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+/** 
+ * @file llmousehandler.h
+ * @brief LLMouseHandler class definition
+ *
+ * Copyright (c) 2001-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_MOUSEHANDLER_H
+#define LL_MOUSEHANDLER_H
+
+// Abstract interface.
+// Intended for use via multiple inheritance. 
+// A class may have as many interfaces as it likes, but never needs to inherit one more than once.
+
+class LLMouseHandler
+{
+public:
+        LLMouseHandler() {}
+        virtual ~LLMouseHandler() {}
+        
+        virtual BOOL    handleMouseDown(S32 x, S32 y, MASK mask) = 0;
+        virtual BOOL    handleMouseUp(S32 x, S32 y, MASK mask) = 0;
+        virtual BOOL    handleHover(S32 x, S32 y, MASK mask) = 0;
+        virtual BOOL    handleScrollWheel(S32 x, S32 y, S32 clicks) = 0;
+        virtual BOOL    handleDoubleClick(S32 x, S32 y, MASK mask) = 0;
+        virtual BOOL    handleRightMouseDown(S32 x, S32 y, MASK mask) = 0;
+        virtual BOOL    handleRightMouseUp(S32 x, S32 y, MASK mask) = 0;
+        virtual BOOL    handleToolTip(S32 x, S32 y, LLString& msg, LLRect* sticky_rect_screen) = 0;
+        virtual const LLString& getName() const = 0;
+
+        // Hack to support LLFocusMgr
+        virtual BOOL isView() = 0;
+
+        virtual void    screenPointToLocal(S32 screen_x, S32 screen_y, S32* local_x, S32* local_y) const = 0;
+        virtual void    localPointToScreen(S32 local_x, S32 local_y, S32* screen_x, S32* screen_y) const = 0;
+};
+
+#endif