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diff --git a/indra/newview/llfloaterimsession.h b/indra/newview/llfloaterimsession.h
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+/** 
+ * @file llfloaterimsession.h
+ * @brief LLFloaterIMSession class definition
+ *
+ * $LicenseInfo:firstyear=2009&license=viewerlgpl$
+ * 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 LL_FLOATERIMSESSION_H
+#define LL_FLOATERIMSESSION_H
+
+#include "llimview.h"
+#include "llfloaterimsessiontab.h"
+#include "llinstantmessage.h"
+#include "lllogchat.h"
+#include "lltooldraganddrop.h"
+#include "llvoicechannel.h"
+#include "llvoiceclient.h"
+
+class LLAvatarName;
+class LLButton;
+class LLChatEntry;
+class LLTextEditor;
+class LLPanelChatControlPanel;
+class LLChatHistory;
+class LLInventoryItem;
+class LLInventoryCategory;
+
+typedef boost::signals2::signal<void(const LLUUID& session_id)> floater_showed_signal_t;
+
+/**
+ * Individual IM window that appears at the bottom of the screen,
+ * optionally "docked" to the bottom tray.
+ */
+class LLFloaterIMSession
+    : public LLVoiceClientStatusObserver
+    , public LLFloaterIMSessionTab
+{
+	LOG_CLASS(LLFloaterIMSession);
+public:
+	LLFloaterIMSession(const LLUUID& session_id);
+
+	virtual ~LLFloaterIMSession();
+
+	void initIMSession(const LLUUID& session_id);
+	void initIMFloater();
+
+	// LLView overrides
+	/*virtual*/ BOOL postBuild();
+	/*virtual*/ void setVisible(BOOL visible);
+	/*virtual*/ BOOL getVisible();
+	// Check typing timeout timer.
+
+	/*virtual*/ void draw();
+	/*virtual*/ BOOL handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
+		EDragAndDropType cargo_type,
+		void* cargo_data,
+		EAcceptance* accept,
+		std::string& tooltip_msg);
+
+	static LLFloaterIMSession* findInstance(const LLUUID& session_id);
+	static LLFloaterIMSession* getInstance(const LLUUID& session_id);
+
+	// LLFloater overrides
+	/*virtual*/ void onClose(bool app_quitting);
+	/*virtual*/ void setDocked(bool docked, bool pop_on_undock = true);
+	// Make IM conversion visible and update the message history
+	static LLFloaterIMSession* show(const LLUUID& session_id);
+
+	// Toggle panel specified by session_id
+	// Returns true iff panel became visible
+	static bool toggle(const LLUUID& session_id);
+
+	void sessionInitReplyReceived(const LLUUID& im_session_id);
+
+	// get new messages from LLIMModel
+	/*virtual*/ void updateMessages();
+	void reloadMessages(bool clean_messages = false);
+	static void onSendMsg(LLUICtrl*, void*);
+	void sendMsgFromInputEditor();
+	void sendMsg(const std::string& msg);
+
+	// callback for LLIMModel on new messages
+	// route to specific floater if it is visible
+	static void newIMCallback(const LLSD& data);
+
+	// called when docked floater's position has been set by chiclet
+	void setPositioned(bool b) { mPositioned = b; };
+
+	void onVisibilityChange(const LLSD& new_visibility);
+	bool enableGearMenuItem(const LLSD& userdata);
+	void GearDoToSelected(const LLSD& userdata);
+	bool checkGearMenuItem(const LLSD& userdata);
+
+	// Implements LLVoiceClientStatusObserver::onChange() to enable the call
+	// button when voice is available
+	void onChange(EStatusType status, const std::string &channelURI,
+			bool proximal);
+
+	virtual LLTransientFloaterMgr::ETransientGroup getGroup() { return LLTransientFloaterMgr::IM; }
+	virtual void onVoiceChannelStateChanged(
+			const LLVoiceChannel::EState& old_state,
+			const LLVoiceChannel::EState& new_state);
+
+	void processIMTyping(const LLIMInfo* im_info, BOOL typing);
+	void processAgentListUpdates(const LLSD& body);
+	void processSessionUpdate(const LLSD& session_update);
+
+	//used as a callback on receiving new IM message
+	static void sRemoveTypingIndicator(const LLSD& data);
+	static void onIMChicletCreated(const LLUUID& session_id);
+    const LLUUID& getOtherParticipantUUID() {return mOtherParticipantUUID;}
+
+	static boost::signals2::connection setIMFloaterShowedCallback(const floater_showed_signal_t::slot_type& cb);
+	static floater_showed_signal_t sIMFloaterShowedSignal;
+
+	bool needsTitleOverwrite() { return mSessionNameUpdatedForTyping && mOtherTyping; }
+	S32 getLastChatMessageIndex() {return mLastMessageIndex;}
+private:
+
+	/*virtual*/ void refresh();
+
+    /*virtual*/ void onTearOffClicked();
+	/*virtual*/ void onClickCloseBtn();
+
+	// Update the window title and input field help text
+	/*virtual*/ void updateSessionName(const std::string& name);
+
+	bool dropPerson(LLUUID* person_id, bool drop);
+
+	BOOL isInviteAllowed() const;
+	BOOL inviteToSession(const uuid_vec_t& agent_ids);
+	static void onInputEditorFocusReceived( LLFocusableElement* caller,void* userdata );
+	static void onInputEditorFocusLost(LLFocusableElement* caller, void* userdata);
+	static void onInputEditorKeystroke(LLTextEditor* caller, void* userdata);
+	void setTyping(bool typing);
+	void onAddButtonClicked();
+	void addSessionParticipants(const uuid_vec_t& uuids);
+	void addP2PSessionParticipants(const LLSD& notification, const LLSD& response, const uuid_vec_t& uuids);
+	void sendParticipantsAddedNotification(const uuid_vec_t& uuids);
+	bool canAddSelectedToChat(const uuid_vec_t& uuids);
+
+	void onCallButtonClicked();
+
+	void boundVoiceChannel();
+
+	// Add the "User is typing..." indicator.
+	void addTypingIndicator(const LLIMInfo* im_info);
+
+	// Remove the "User is typing..." indicator.
+	void removeTypingIndicator(const LLIMInfo* im_info = NULL);
+
+	static void closeHiddenIMToasts();
+
+	static void confirmLeaveCallCallback(const LLSD& notification, const LLSD& response);
+
+	S32 mLastMessageIndex;
+
+	EInstantMessage mDialog;
+	LLUUID mOtherParticipantUUID;
+	bool mPositioned;
+
+	LLUIString mTypingStart;
+	bool mMeTyping;
+	bool mOtherTyping;
+	bool mShouldSendTypingState;
+	LLFrameTimer mTypingTimer;
+	LLFrameTimer mTypingTimeoutTimer;
+	bool mSessionNameUpdatedForTyping;
+
+	bool mSessionInitialized;
+	LLSD mQueuedMsgsForInit;
+
+	uuid_vec_t mInvitedParticipants;
+	uuid_vec_t mPendingParticipants;
+
+	// connection to voice channel state change signal
+	boost::signals2::connection mVoiceChannelStateChangeConnection;
+};
+
+#endif  // LL_FLOATERIMSESSION_H