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diff --git a/indra/newview/llimpanel.h b/indra/newview/llimpanel.h
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+/** 
+ * @file llimpanel.h
+ * @brief LLIMPanel class definition
+ *
+ * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_IMPANEL_H
+#define LL_IMPANEL_H
+
+#include "llfloater.h"
+#include "lluuid.h"
+#include "lldarray.h"
+#include "llinstantmessage.h"
+
+class LLLineEditor;
+class LLViewerTextEditor;
+class LLInventoryItem;
+class LLInventoryCategory;
+
+class LLFloaterIMPanel : public LLFloater
+{
+public:
+	// The session id is the id of the session this is for. The target
+	// refers to the user (or group) that where this session serves as
+	// the default. For example, if you open a session though a
+	// calling card, a new session id will be generated, but the
+	// target_id will be the agent referenced by the calling card.
+	LLFloaterIMPanel(const std::string& name, const LLRect& rect,
+			  const std::string& session_label,
+			  const LLUUID& session_id, const LLUUID& target_id,
+			  EInstantMessage dialog);
+
+	/*virtual*/ BOOL postBuild();
+
+	// Check typing timeout timer.
+	/*virtual*/ void draw();
+
+	/*virtual*/ void close(bool app_quitting = FALSE);
+
+	// add target ids to the session. 
+	// Return TRUE if successful, otherwise FALSE.
+	BOOL addParticipants(const LLDynamicArray<LLUUID>& agent_ids);
+
+	void addHistoryLine(const std::string &utf8msg, 
+						const LLColor4& color = LLColor4::white, 
+						bool log_to_file = true);
+	void setInputFocus( BOOL b );
+
+	void selectAll();
+	void selectNone();
+	void setVisible(BOOL b);
+
+	BOOL handleKeyHere(KEY key, MASK mask, BOOL called_from_parent);
+	BOOL handleDragAndDrop(S32 x, S32 y, MASK mask,
+						   BOOL drop, EDragAndDropType cargo_type,
+						   void *cargo_data, EAcceptance *accept,
+						   LLString& tooltip_msg);
+
+	static void		onInputEditorFocusReceived( LLUICtrl* caller, void* userdata );
+	static void		onInputEditorFocusLost(LLLineEditor* caller, void* userdata);
+	static void		onInputEditorKeystroke(LLLineEditor* caller, void* userdata);
+	static void		onTabClick( void* userdata );
+
+	static void		onClickProfile( void* userdata );		//  Profile button pressed
+	static void		onClickClose( void* userdata );
+
+	//const LLUUID& getItemUUID() const { return mItemUUID; }
+	const LLUUID& getSessionID() const { return mSessionUUID; }
+	const LLUUID& getOtherParticipantID() const { return mOtherParticipantUUID; }
+
+	// HACK -- for enabling a teleport button for helpers
+	static void onTeleport(void* userdata);
+	void addTeleportButton(const LLUUID& lure_id);
+	void removeTeleportButton();
+
+	// Handle other participant in the session typing.
+	void processIMTyping(const LLIMInfo* im_info, BOOL typing);
+	static void chatFromLogFile(LLString line, void* userdata);
+
+private:
+	// called by constructors
+	void init();
+
+	// Called by UI methods.
+	void sendMsg();
+
+	// for adding agents via the UI. Return TRUE if possible, do it if 
+	BOOL dropCallingCard(LLInventoryItem* item, BOOL drop);
+	BOOL dropCategory(LLInventoryCategory* category, BOOL drop);
+
+	// test if local agent can add agents.
+	BOOL isAddAllowed() const;
+
+	// Called whenever the user starts or stops typing.
+	// Sends the typing state to the other user if necessary.
+	void setTyping(BOOL typing);
+
+	// Add the "User is typing..." indicator.
+	void addTypingIndicator(const LLIMInfo* im_info);
+
+	// Remove the "User is typing..." indicator.
+	void removeTypingIndicator();
+
+	void sendTypingState(BOOL typing);
+	
+	static LLFloaterIMPanel* sInstance;
+
+private:
+	LLLineEditor* mInputEditor;
+	LLViewerTextEditor* mHistoryEditor;
+	std::string mSessionLabel;
+
+	// The value of the mSessionUUID depends on how the IM session was started:
+	//   one-on-one  ==> random id
+	//   group ==> group_id
+	//   inventory folder ==> folder item_id 
+	//   911 ==> Gaurdian_Angel_Group_ID ^ gAgent.getID()
+	LLUUID mSessionUUID;
+
+	// The value mOtherParticipantUUID depends on how the IM session was started:
+	//   one-on-one = recipient's id
+	//   group ==> group_id
+	//   inventory folder ==> first target id in list
+	//   911 ==> sender
+	LLUUID mOtherParticipantUUID;
+
+	// the lure ID for help IM sessions
+	LLUUID mLureID;
+
+	EInstantMessage mDialog;
+
+	// Are you currently typing?
+	BOOL mTyping;
+
+	// Is other user currently typing?
+	BOOL mOtherTyping;
+
+	// Where does the "User is typing..." line start?
+	S32 mTypingLineStartIndex;
+
+	BOOL mSentTypingState;
+	
+	// Optimization:  Don't send "User is typing..." until the
+	// user has actually been typing for a little while.  Prevents
+	// extra IMs for brief "lol" type utterences.
+	LLFrameTimer mFirstKeystrokeTimer;
+
+	// Timer to detect when user has stopped typing.
+	LLFrameTimer mLastKeystrokeTimer;
+};
+
+
+#endif  // LL_IMPANEL_H