Merge pull from richard/viewer-chui

23 files changed, 315 insertions, 179 deletions

diff --git a/indra/llcommon/llassettype.cpp b/indra/llcommon/llassettype.cpp
index 5e566d6c7c..5ae2df3994 100644
--- a/indra/llcommon/llassettype.cpp
+++ b/indra/llcommon/llassettype.cpp
@@ -95,6 +95,7 @@ LLAssetDictionary::LLAssetDictionary()
 	addEntry(LLAssetType::AT_LINK_FOLDER, 		new AssetEntry("FOLDER_LINK",		"link_f", 	"sym folder link",	false,		false,		true));
 	addEntry(LLAssetType::AT_MESH,              new AssetEntry("MESH",              "mesh",     "mesh",             false,      false,      false));
 	addEntry(LLAssetType::AT_WIDGET,            new AssetEntry("WIDGET",            "widget",   "widget",           false,      false,      false));
+	addEntry(LLAssetType::AT_PERSON,            new AssetEntry("PERSON",            "person",   "person",           false,      false,      false));
 	addEntry(LLAssetType::AT_NONE, 				new AssetEntry("NONE",				"-1",		NULL,		  		FALSE,		FALSE,		FALSE));
 
 };
diff --git a/indra/llcommon/llassettype.h b/indra/llcommon/llassettype.h
index d538accbf7..69b01731e5 100644
--- a/indra/llcommon/llassettype.h
+++ b/indra/llcommon/llassettype.h
@@ -112,6 +112,9 @@ public:
 		AT_WIDGET = 40,
 			// UI Widget: this is *not* an inventory asset type, only a viewer side asset (e.g. button, other ui items...)
 		
+		AT_PERSON = 45,
+			// A user uuid  which is not an inventory asset type, used in viewer only for adding a person to a chat via drag and drop.
+
 		AT_MESH = 49,
 			// Mesh data in our proprietary SLM format
 		
diff --git a/indra/llcommon/stdenums.h b/indra/llcommon/stdenums.h
index 40b3364b36..efcbe76795 100644
--- a/indra/llcommon/stdenums.h
+++ b/indra/llcommon/stdenums.h
@@ -51,7 +51,8 @@ enum EDragAndDropType
 	DAD_LINK			= 14,
 	DAD_MESH            = 15,
 	DAD_WIDGET          = 16,
-	DAD_COUNT           = 17,   // number of types in this enum
+	DAD_PERSON          = 17,
+	DAD_COUNT           = 18,   // number of types in this enum
 };
 
 // Reasons for drags to be denied.
diff --git a/indra/llinventory/llinventorytype.cpp b/indra/llinventory/llinventorytype.cpp
index 8282d79b67..8807b36117 100644
--- a/indra/llinventory/llinventorytype.cpp
+++ b/indra/llinventory/llinventorytype.cpp
@@ -85,6 +85,7 @@ LLInventoryDictionary::LLInventoryDictionary()
 	addEntry(LLInventoryType::IT_GESTURE,             new InventoryEntry("gesture",   "gesture",       1, LLAssetType::AT_GESTURE)); 
 	addEntry(LLInventoryType::IT_MESH,                new InventoryEntry("mesh",      "mesh",          1, LLAssetType::AT_MESH));
 	addEntry(LLInventoryType::IT_WIDGET,              new InventoryEntry("widget",    "widget",        1, LLAssetType::AT_WIDGET));
+	addEntry(LLInventoryType::IT_PERSON,              new InventoryEntry("person",    "person",        1, LLAssetType::AT_PERSON));
 }
 
 
@@ -140,7 +141,7 @@ DEFAULT_ASSET_FOR_INV_TYPE[LLAssetType::AT_COUNT] =
 	LLInventoryType::IT_NONE,			// 42	AT_NONE
 	LLInventoryType::IT_NONE,			// 43	AT_NONE
 	LLInventoryType::IT_NONE,			// 44	AT_NONE
-	LLInventoryType::IT_NONE,			// 45	AT_NONE
+	LLInventoryType::IT_PERSON,			// 45	AT_PERSON
 	LLInventoryType::IT_NONE,			// 46	AT_NONE
 	LLInventoryType::IT_NONE,			// 47	AT_NONE
 	LLInventoryType::IT_NONE,			// 48	AT_NONE
diff --git a/indra/llinventory/llinventorytype.h b/indra/llinventory/llinventorytype.h
index 4d1e0db040..645ebab234 100644
--- a/indra/llinventory/llinventorytype.h
+++ b/indra/llinventory/llinventorytype.h
@@ -63,7 +63,8 @@ public:
 		IT_GESTURE = 20,
 		IT_MESH = 22,
 		IT_WIDGET = 23,
-		IT_COUNT = 24,
+		IT_PERSON = 24,
+		IT_COUNT = 25,
 
 		IT_NONE = -1
 	};
diff --git a/indra/newview/llavataractions.cpp b/indra/newview/llavataractions.cpp
index c3d560540d..c9031dd26a 100755
--- a/indra/newview/llavataractions.cpp
+++ b/indra/newview/llavataractions.cpp
@@ -285,7 +285,7 @@ bool LLAvatarActions::canCall()
 }
 
 // static
-void LLAvatarActions::startConference(const uuid_vec_t& ids)
+void LLAvatarActions::startConference(const uuid_vec_t& ids, const LLUUID& floater_id)
 {
 	// *HACK: Copy into dynamic array
 	LLDynamicArray<LLUUID> id_array;
@@ -294,7 +294,7 @@ void LLAvatarActions::startConference(const uuid_vec_t& ids)
 		id_array.push_back(*it);
 	}
 	const std::string title = LLTrans::getString("conference-title");
-	LLUUID session_id = gIMMgr->addSession(title, IM_SESSION_CONFERENCE_START, ids[0], id_array);
+	LLUUID session_id = gIMMgr->addSession(title, IM_SESSION_CONFERENCE_START, ids[0], id_array, false, floater_id);
 	if (session_id != LLUUID::null)
 	{
 		LLIMFloater::show(session_id);
diff --git a/indra/newview/llavataractions.h b/indra/newview/llavataractions.h
index e5dad74fc8..0a69ad86a3 100644
--- a/indra/newview/llavataractions.h
+++ b/indra/newview/llavataractions.h
@@ -86,9 +86,9 @@ public:
 	static void startAdhocCall(const uuid_vec_t& ids);
 
 	/**
-	 * Start conference chat with the given avatars.
+	 * Start conference chat with the given avatars in a specific IM floater.
 	 */
-	static void startConference(const uuid_vec_t& ids);
+	static void startConference(const uuid_vec_t& ids, const LLUUID& floater_id = LLUUID::null);
 
 	/**
 	 * Show avatar profile.
diff --git a/indra/newview/llavatarlistitem.cpp b/indra/newview/llavatarlistitem.cpp
index 30eecfe323..e670d3ea04 100644
--- a/indra/newview/llavatarlistitem.cpp
+++ b/indra/newview/llavatarlistitem.cpp
@@ -31,6 +31,7 @@
 #include "llavatarlistitem.h"
 
 #include "llbutton.h"
+#include "llclipboard.h"
 #include "llfloaterreg.h"
 #include "lltextutil.h"
 
@@ -38,6 +39,7 @@
 #include "llavatarnamecache.h"
 #include "llavatariconctrl.h"
 #include "lloutputmonitorctrl.h"
+#include "lltooldraganddrop.h"
 
 bool LLAvatarListItem::sStaticInitialized = false;
 S32 LLAvatarListItem::sLeftPadding = 0;
@@ -334,6 +336,62 @@ BOOL LLAvatarListItem::handleDoubleClick(S32 x, S32 y, MASK mask)
 	return LLPanel::handleDoubleClick(x, y, mask);
 }
 
+BOOL LLAvatarListItem::handleMouseDown(S32 x, S32 y, MASK mask)
+{
+	if (LLUICtrl::handleMouseDown(x, y, mask))
+	{
+		return TRUE;
+	}
+
+	gFocusMgr.setMouseCapture(this);
+
+	S32 screen_x;
+	S32 screen_y;
+	localPointToScreen(x, y, &screen_x, &screen_y);
+	LLToolDragAndDrop::getInstance()->setDragStart(screen_x, screen_y);
+
+	return TRUE;
+}
+
+BOOL LLAvatarListItem::handleMouseUp( S32 x, S32 y, MASK mask )
+{
+	if (LLUICtrl::childrenHandleMouseUp(x, y, mask))
+	{
+		return TRUE;
+	}
+
+	if(hasMouseCapture())
+	{
+		gFocusMgr.setMouseCapture(NULL);
+	}
+	return TRUE;
+}
+
+BOOL LLAvatarListItem::handleHover(S32 x, S32 y, MASK mask)
+{
+	bool handled = hasMouseCapture();
+	if(handled)
+	{
+		S32 screen_x;
+		S32 screen_y;
+		localPointToScreen(x, y, &screen_x, &screen_y);
+
+		if(LLToolDragAndDrop::getInstance()->isOverThreshold(screen_x, screen_y))
+		{
+			// First, create the global drag and drop object
+			std::vector<EDragAndDropType> types;
+			uuid_vec_t cargo_ids;
+			types.push_back(DAD_PERSON);
+			cargo_ids.push_back(mAvatarId);
+			gClipboard.setSourceObject(mAvatarId, LLAssetType::AT_PERSON);
+			LLToolDragAndDrop::ESource src = LLToolDragAndDrop::SOURCE_PEOPLE;
+			LLToolDragAndDrop::getInstance()->beginMultiDrag(types, cargo_ids, src);
+		}
+	}
+
+	return handled;
+}
+
 void LLAvatarListItem::setValue( const LLSD& value )
 {
 	if (!value.isMap()) return;;
diff --git a/indra/newview/llavatarlistitem.h b/indra/newview/llavatarlistitem.h
index c95ac39696..28a50870d4 100644
--- a/indra/newview/llavatarlistitem.h
+++ b/indra/newview/llavatarlistitem.h
@@ -112,6 +112,9 @@ public:
 	void onProfileBtnClick();
 
 	/*virtual*/ BOOL handleDoubleClick(S32 x, S32 y, MASK mask);
+	/*virtual*/ BOOL handleMouseDown( S32 x, S32 y, MASK mask );
+	/*virtual*/ BOOL handleMouseUp(S32 x, S32 y, MASK mask);
+	/*virtual*/ BOOL handleHover(S32 x, S32 y, MASK mask);
 
 protected:
 	/**
diff --git a/indra/newview/llchicletbar.cpp b/indra/newview/llchicletbar.cpp
index f1bc51fbe7..8701b602ce 100644
--- a/indra/newview/llchicletbar.cpp
+++ b/indra/newview/llchicletbar.cpp
@@ -125,10 +125,12 @@ void LLChicletBar::sessionRemoved(const LLUUID& session_id)
 	if(getChicletPanel())
 	{
 		// IM floater should be closed when session removed and associated chiclet closed
-		LLIMFloater* iMfloater = LLFloaterReg::findTypedInstance<LLIMFloater>("impanel", session_id);
-		if (iMfloater != NULL)
+		LLIMFloater* im_floater = LLFloaterReg::findTypedInstance<LLIMFloater>("impanel", session_id);
+		if (im_floater != NULL && !im_floater->getStartConferenceInSameFloater())
 		{
-			iMfloater->closeFloater();
+			// Close the IM floater only if we are not planning to close the P2P chat
+			// and start a new conference in the same floater.
+			im_floater->closeFloater();
 		}
 
 		getChicletPanel()->removeChiclet(session_id);
diff --git a/indra/newview/llimconversation.cpp b/indra/newview/llimconversation.cpp
index 708913bbee..c2621938e1 100644
--- a/indra/newview/llimconversation.cpp
+++ b/indra/newview/llimconversation.cpp
@@ -83,8 +83,10 @@ BOOL LLIMConversation::postBuild()
 	mExpandCollapseBtn->setClickedCallback(boost::bind(&LLIMConversation::onSlide, this));
 
 	mParticipantListPanel = getChild<LLLayoutPanel>("speakers_list_panel");
-	mParticipantListPanel->setVisible(
-			mIsNearbyChat? false : gSavedSettings.getBOOL("IMShowControlPanel"));
+
+	// Show the participants list in torn off floaters only.
+	mParticipantListPanel->setVisible(gSavedSettings.getBOOL("IMShowControlPanel")
+									  && !mIsNearbyChat); // *TODO: temporarily disabled for Nearby chat
 	mExpandCollapseBtn->setImageOverlay(
 				getString(mParticipantListPanel->getVisible() ? "collapse_icon" : "expand_icon"));
 	mExpandCollapseBtn->setEnabled(!mIsP2PChat);
@@ -209,12 +211,10 @@ void LLIMConversation::updateHeaderAndToolbar()
 	}
 
 	bool is_control_panel_visible = false;
-	if (!mIsP2PChat)
-	{
 		// Control panel should be visible only in torn off floaters.
 		is_control_panel_visible = !is_hosted && gSavedSettings.getBOOL("IMShowControlPanel");
-		mParticipantListPanel->setVisible(is_control_panel_visible);
-	}
+		mParticipantListPanel->setVisible(!mIsP2PChat && is_control_panel_visible
+				&& !mIsNearbyChat); // *TODO: temporarily disabled for Nearby chat
 
 	// Display collapse image (<<) if the floater is hosted
 	// or if it is torn off but has an open control panel.
diff --git a/indra/newview/llimfloater.cpp b/indra/newview/llimfloater.cpp
index c99da9e9c1..dcd19b5856 100644
--- a/indra/newview/llimfloater.cpp
+++ b/indra/newview/llimfloater.cpp
@@ -33,12 +33,14 @@
 
 #include "llagent.h"
 #include "llappviewer.h"
+#include "llavataractions.h"
 #include "llavatarnamecache.h"
 #include "llbutton.h"
 #include "llchannelmanager.h"
 #include "llchiclet.h"
 #include "llchicletbar.h"
 #include "llfloaterreg.h"
+#include "llfloateravatarpicker.h"
 #include "llimfloatercontainer.h" // to replace separate IM Floaters with multifloater container
 #include "llinventoryfunctions.h"
 //#include "lllayoutstack.h"
@@ -71,18 +73,12 @@ LLIMFloater::LLIMFloater(const LLUUID& session_id)
 	mTypingTimer(),
 	mTypingTimeoutTimer(),
 	mPositioned(false),
-	mSessionInitialized(false)
+	mSessionInitialized(false),
+	mStartConferenceInSameFloater(false)
 {
 	mIsNearbyChat = false;
+	initIMSession(session_id);
 
-	mSession = LLIMModel::getInstance()->findIMSession(mSessionID);
-
-	if (mSession)
-	{
-		mIsP2PChat = mSession->isP2PSessionType();
-		mSessionInitialized = mSession->mSessionInitialized;
-		mDialog = mSession->mType;
-	}
 	setOverlapsScreenChannel(true);
 
 	LLTransientFloaterMgr::getInstance()->addControlView(LLTransientFloaterMgr::IM, this);
@@ -112,6 +108,29 @@ void LLIMFloater::onFocusReceived()
 // virtual
 void LLIMFloater::onClose(bool app_quitting)
 {
+	LLIMModel::LLIMSession* session = LLIMModel::instance().findIMSession(
+				mSessionID);
+
+	if (session == NULL)
+	{
+		llwarns << "Empty session." << llendl;
+		return;
+	}
+
+	bool is_call_with_chat = session->isGroupSessionType()
+			|| session->isAdHocSessionType() || session->isP2PSessionType();
+
+	LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);
+
+	if (is_call_with_chat && voice_channel != NULL
+			&& voice_channel->isActive())
+	{
+		LLSD payload;
+		payload["session_id"] = mSessionID;
+		LLNotificationsUtil::add("ConfirmLeaveCall", LLSD(), payload, confirmLeaveCallCallback);
+		return;
+	}
+
 	setTyping(false);
 
 	// The source of much argument and design thrashing
@@ -211,8 +230,24 @@ LLIMFloater::~LLIMFloater()
 	LLTransientFloaterMgr::getInstance()->removeControlView(LLTransientFloaterMgr::IM, this);
 }
 
-//virtual
-BOOL LLIMFloater::postBuild()
+void LLIMFloater::initIMSession(const LLUUID& session_id)
+{
+	// Change the floater key to bind it to a new session.
+	setKey(session_id);
+
+	mSessionID = session_id;
+	mSession = LLIMModel::getInstance()->findIMSession(mSessionID);
+
+	if (mSession)
+	{
+		mIsP2PChat = mSession->isP2PSessionType();
+		mSessionInitialized = mSession->mSessionInitialized;
+
+		mDialog = mSession->mType;
+	}
+}
+
+void LLIMFloater::initIMFloater()
 {
 	const LLUUID& other_party_id =
 			LLIMModel::getInstance()->getOtherParticipantID(mSessionID);
@@ -223,6 +258,34 @@ BOOL LLIMFloater::postBuild()
 
 	boundVoiceChannel();
 
+	// Show control panel in torn off floaters only.
+	mParticipantListPanel->setVisible(!getHost() && gSavedSettings.getBOOL("IMShowControlPanel"));
+
+	// Disable input editor if session cannot accept text
+	if ( mSession && !mSession->mTextIMPossible )
+	{
+		mInputEditor->setEnabled(FALSE);
+		mInputEditor->setLabel(LLTrans::getString("IM_unavailable_text_label"));
+	}
+
+	if (mIsP2PChat)
+	{
+		// look up display name for window title
+		LLAvatarNameCache::get(mSession->mOtherParticipantID,
+							   boost::bind(&LLIMFloater::onAvatarNameCache,
+										   this, _1, _2));
+	}
+	else
+	{
+		std::string session_name(LLIMModel::instance().getName(mSessionID));
+		updateSessionName(session_name, session_name);
+	}
+}
+
+//virtual
+BOOL LLIMFloater::postBuild()
+{
+	LLIMConversation::postBuild();
 
 	mInputEditor = getChild<LLLineEditor>("chat_editor");
 	mInputEditor->setMaxTextLength(1023);
@@ -248,26 +311,12 @@ BOOL LLIMFloater::postBuild()
 
 	mTypingStart = LLTrans::getString("IM_typing_start_string");
 
-	// Disable input editor if session cannot accept text
-	if ( mSession && !mSession->mTextIMPossible )
-	{
-		mInputEditor->setEnabled(FALSE);
-		mInputEditor->setLabel(LLTrans::getString("IM_unavailable_text_label"));
-	}
+	LLButton* add_btn = getChild<LLButton>("add_btn");
+
+	// Allow to add chat participants depending on the session type
+	add_btn->setEnabled(isInviteAllowed());
+	add_btn->setClickedCallback(boost::bind(&LLIMFloater::onAddButtonClicked, this));
 
-	if (mIsP2PChat)
-	{
-		// look up display name for window title
-		LLAvatarNameCache::get(mSession->mOtherParticipantID,
-							   boost::bind(&LLIMFloater::onAvatarNameCache,
-										   this, _1, _2));
-	}
-	else
-	{
-		std::string session_name(LLIMModel::instance().getName(mSessionID));
-		updateSessionName(session_name, session_name);
-	}
-	
 	childSetAction("voice_call_btn", boost::bind(&LLIMFloater::onCallButtonClicked, this));
 
 	LLVoiceClient::getInstance()->addObserver(this);
@@ -275,7 +324,75 @@ BOOL LLIMFloater::postBuild()
 	//*TODO if session is not initialized yet, add some sort of a warning message like "starting session...blablabla"
 	//see LLFloaterIMPanel for how it is done (IB)
 
-	return LLIMConversation::postBuild();
+	initIMFloater();
+
+	return TRUE;
+}
+
+void LLIMFloater::onAddButtonClicked()
+{
+       LLFloaterAvatarPicker* picker = LLFloaterAvatarPicker::show(boost::bind(&LLIMFloater::onAvatarPicked, this, _1, _2), TRUE, TRUE);
+       if (!picker)
+       {
+               return;
+       }
+
+       // Need to disable 'ok' button when selected users are already in conversation.
+       picker->setOkBtnEnableCb(boost::bind(&LLIMFloater::canAddSelectedToChat, this, _1));
+       LLFloater* root_floater = gFloaterView->getParentFloater(this);
+       if (root_floater)
+       {
+               root_floater->addDependentFloater(picker);
+       }
+}
+
+void LLIMFloater::onAvatarPicked(const uuid_vec_t& ids, const std::vector<LLAvatarName> names)
+{
+       if (mIsP2PChat)
+       {
+               mStartConferenceInSameFloater = true;
+               onClose(false);
+
+               uuid_vec_t temp_ids;
+               temp_ids.push_back(mOtherParticipantUUID);
+               temp_ids.insert(temp_ids.end(), ids.begin(), ids.end());
+
+               LLAvatarActions::startConference(temp_ids, mSessionID);
+       }
+       else
+       {
+               inviteToSession(ids);
+       }
+}
+
+bool LLIMFloater::canAddSelectedToChat(const uuid_vec_t& uuids)
+{
+       if (!mSession
+               || mDialog == IM_SESSION_GROUP_START
+               || mDialog == IM_SESSION_INVITE && gAgent.isInGroup(mSessionID))
+       {
+               return false;
+       }
+
+       for (uuid_vec_t::const_iterator id = uuids.begin();
+                       id != uuids.end(); ++id)
+       {
+               if (*id == mOtherParticipantUUID)
+               {
+                       return false;
+               }
+
+               for (uuid_vec_t::const_iterator target_id = mSession->mInitialTargetIDs.begin();
+                               target_id != mSession->mInitialTargetIDs.end(); ++target_id)
+               {
+                       if (*id == *target_id)
+                       {
+                               return false;
+                       }
+               }
+       }
+
+       return true;
 }
 
 void LLIMFloater::boundVoiceChannel()
@@ -603,17 +720,15 @@ void LLIMFloater::sessionInitReplyReceived(const LLUUID& im_session_id)
 	//will be different only for an ad-hoc im session
 	if (mSessionID != im_session_id)
 	{
-		mSessionID = im_session_id;
-		setKey(im_session_id);
+		initIMSession(im_session_id);
 
 		boundVoiceChannel();
 
-		mSession = LLIMModel::getInstance()->findIMSession(mSessionID);
-		mIsP2PChat = mSession && mSession->isP2PSessionType();
-
 		buildParticipantList();
 	}
-	
+
+	initIMFloater();
+
 	//*TODO here we should remove "starting session..." warning message if we added it in postBuild() (IB)
 
 	//need to send delayed messaged collected while waiting for session initialization
@@ -876,96 +991,62 @@ void LLIMFloater::processSessionUpdate(const LLSD& session_update)
 	}
 }
 
-BOOL LLIMFloater::handleDragAndDrop(S32 x, S32 y, MASK mask,
-		BOOL drop, EDragAndDropType cargo_type,
-		void *cargo_data, EAcceptance *accept,
-		std::string& tooltip_msg)
+// virtual
+BOOL LLIMFloater::handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
+									EDragAndDropType cargo_type,
+									void* cargo_data,
+									EAcceptance* accept,
+									std::string& tooltip_msg)
 {
-	if (mDialog == IM_NOTHING_SPECIAL)
-	{
-		LLToolDragAndDrop::handleGiveDragAndDrop(mOtherParticipantUUID, mSessionID, drop,
-				cargo_type, cargo_data, accept);
-	}
-
-	// handle case for dropping calling cards (and folders of calling cards) onto invitation panel for invites
-	else if (isInviteAllowed())
+	if (cargo_type == DAD_PERSON)
 	{
-		*accept = ACCEPT_NO;
-
-		if (cargo_type == DAD_CALLINGCARD)
+		if (dropPerson(static_cast<LLInventoryObject*>(cargo_data), drop))
 		{
-			if (dropCallingCard((LLInventoryItem*) cargo_data, drop))
-			{
-				*accept = ACCEPT_YES_MULTI;
-			}
+			*accept = ACCEPT_YES_MULTI;
 		}
-		else if (cargo_type == DAD_CATEGORY)
+		else
 		{
-			if (dropCategory((LLInventoryCategory*) cargo_data, drop))
-			{
-				*accept = ACCEPT_YES_MULTI;
-			}
+			*accept = ACCEPT_NO;
 		}
 	}
 	return TRUE;
 }
 
-BOOL LLIMFloater::dropCallingCard(LLInventoryItem* item, BOOL drop)
+bool LLIMFloater::dropPerson(LLInventoryObject* item, bool drop)
 {
-	BOOL rv = isInviteAllowed();
-	if (rv && item && item->getCreatorUUID().notNull())
-	{
-		if (drop)
-		{
-			uuid_vec_t ids;
-			ids.push_back(item->getCreatorUUID());
-			inviteToSession(ids);
-		}
-	}
-	else
+	bool res = item && item->getUUID().notNull();
+	if(res)
 	{
-		// set to false if creator uuid is null.
-		rv = FALSE;
-	}
-	return rv;
-}
+		uuid_vec_t ids;
+		ids.push_back(item->getUUID());
 
-BOOL LLIMFloater::dropCategory(LLInventoryCategory* category, BOOL drop)
-{
-	BOOL rv = isInviteAllowed();
-	if (rv && category)
-	{
-		LLInventoryModel::cat_array_t cats;
-		LLInventoryModel::item_array_t items;
-		LLUniqueBuddyCollector buddies;
-		gInventory.collectDescendentsIf(category->getUUID(),
-				cats,
-				items,
-				LLInventoryModel::EXCLUDE_TRASH,
-				buddies);
-		S32 count = items.count();
-		if (count == 0)
-		{
-			rv = FALSE;
-		}
-		else if (drop)
+		res = canAddSelectedToChat(ids);
+		if(res && drop)
 		{
-			uuid_vec_t ids;
-			ids.reserve(count);
-			for (S32 i = 0; i < count; ++i)
+			if (mIsP2PChat)
 			{
-				ids.push_back(items.get(i)->getCreatorUUID());
+				mStartConferenceInSameFloater = true;
+				onClose(false);
+
+				ids.push_back(mOtherParticipantUUID);
+
+				LLAvatarActions::startConference(ids, mSessionID);
+			}
+			else
+			{
+				inviteToSession(ids);
 			}
-			inviteToSession(ids);
 		}
 	}
-	return rv;
+
+	return res;
 }
 
 BOOL LLIMFloater::isInviteAllowed() const
 {
 	return ((IM_SESSION_CONFERENCE_START == mDialog)
-			|| (IM_SESSION_INVITE == mDialog));
+			 || (IM_SESSION_INVITE == mDialog && !gAgent.isInGroup(mSessionID))
+			 || mIsP2PChat);
 }
 
 class LLSessionInviteResponder: public LLHTTPClient::Responder
@@ -1107,14 +1188,6 @@ void LLIMFloater::confirmLeaveCallCallback(const LLSD& notification, const LLSD&
 }
 
 // static
-void LLIMFloater::initIMFloater()
-{
-	// This is called on viewer start up
-	// init chat window type before user changed it in preferences
-	isChatMultiTab();
-}
-
-//static
 void LLIMFloater::sRemoveTypingIndicator(const LLSD& data)
 {
 	LLUUID session_id = data["session_id"];
@@ -1139,7 +1212,6 @@ void LLIMFloater::onIMChicletCreated( const LLUUID& session_id )
 {
 	LLIMFloater::addToHost(session_id);
 }
-
 void LLIMFloater::addToHost(const LLUUID& session_id)
 {
 	if (LLIMConversation::isChatMultiTab())
@@ -1157,32 +1229,3 @@ void LLIMFloater::addToHost(const LLUUID& session_id)
 		}
 	}
 }
-
-void	LLIMFloater::onClickCloseBtn()
-{
-
-	LLIMModel::LLIMSession* session = LLIMModel::instance().findIMSession(
-			mSessionID);
-
-	if (session == NULL)
-	{
-		llwarns << "Empty session." << llendl;
-		return;
-	}
-
-	bool is_call_with_chat = session->isGroupSessionType()
-			|| session->isAdHocSessionType() || session->isP2PSessionType();
-
-	LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);
-
-	if (is_call_with_chat && voice_channel != NULL
-			&& voice_channel->isActive())
-	{
-		LLSD payload;
-		payload["session_id"] = mSessionID;
-		LLNotificationsUtil::add("ConfirmLeaveCall", LLSD(), payload, confirmLeaveCallCallback);
-		return;
-	}
-
-	LLFloater::onClickCloseBtn();
-}
diff --git a/indra/newview/llimfloater.h b/indra/newview/llimfloater.h
index 24f28c8aee..b02f779637 100644
--- a/indra/newview/llimfloater.h
+++ b/indra/newview/llimfloater.h
@@ -56,6 +56,9 @@ public:
 
 	virtual ~LLIMFloater();
 
+	void initIMSession(const LLUUID& session_id);
+	void initIMFloater();
+
 	// LLView overrides
 	/*virtual*/ BOOL postBuild();
 	/*virtual*/ void setVisible(BOOL visible);
@@ -111,20 +114,18 @@ public:
 	void processAgentListUpdates(const LLSD& body);
 	void processSessionUpdate(const LLSD& session_update);
 
-	BOOL handleDragAndDrop(S32 x, S32 y, MASK mask,
-			BOOL drop, EDragAndDropType cargo_type,
-			void *cargo_data, EAcceptance *accept,
-			std::string& tooltip_msg);
-
+	/*virtual*/ BOOL handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
+									   EDragAndDropType cargo_type,
+									   void* cargo_data,
+									   EAcceptance* accept,
+									   std::string& tooltip_msg);
 
-	static void initIMFloater();
 
 	//used as a callback on receiving new IM message
 	static void sRemoveTypingIndicator(const LLSD& data);
 	static void onIMChicletCreated(const LLUUID& session_id);
 
-protected:
-	/* virtual */ void onClickCloseBtn();
+	bool getStartConferenceInSameFloater() const { return mStartConferenceInSameFloater; }
 
 private:
 	// process focus events to set a currently active session
@@ -137,8 +138,7 @@ private:
 	// For display name lookups for IM window titles
 	void onAvatarNameCache(const LLUUID& agent_id, const LLAvatarName& av_name);
 
-	BOOL dropCallingCard(LLInventoryItem* item, BOOL drop);
-	BOOL dropCategory(LLInventoryCategory* category, BOOL drop);
+	bool dropPerson(LLInventoryObject* item, bool drop);
 
 	BOOL isInviteAllowed() const;
 	BOOL inviteToSession(const uuid_vec_t& agent_ids);
@@ -147,6 +147,10 @@ private:
 	static void onInputEditorFocusLost(LLFocusableElement* caller, void* userdata);
 	static void onInputEditorKeystroke(LLLineEditor* caller, void* userdata);
 	void setTyping(bool typing);
+	void onAddButtonClicked();
+	void onAvatarPicked(const uuid_vec_t& ids, const std::vector<LLAvatarName> names);
+	bool canAddSelectedToChat(const uuid_vec_t& uuids);
+
 	void onCallButtonClicked();
 
 	// set the enable/disable state for the Call button
@@ -186,6 +190,8 @@ private:
 	bool mSessionInitialized;
 	LLSD mQueuedMsgsForInit;
 
+	bool mStartConferenceInSameFloater;
+
 	// connection to voice channel state change signal
 	boost::signals2::connection mVoiceChannelStateChangeConnection;
 };
diff --git a/indra/newview/llimview.cpp b/indra/newview/llimview.cpp
index 46b1cb5f18..0d2b1f06b5 100644
--- a/indra/newview/llimview.cpp
+++ b/indra/newview/llimview.cpp
@@ -2591,7 +2591,8 @@ LLUUID LLIMMgr::addSession(
 	const std::string& name,
 	EInstantMessage dialog,
 	const LLUUID& other_participant_id,
-	const LLDynamicArray<LLUUID>& ids, bool voice)
+	const LLDynamicArray<LLUUID>& ids, bool voice,
+	const LLUUID& floater_id)
 {
 	if (0 == ids.getLength())
 	{
@@ -2606,6 +2607,18 @@ LLUUID LLIMMgr::addSession(
 
 	LLUUID session_id = computeSessionID(dialog,other_participant_id);
 
+	if (floater_id.notNull())
+	{
+		LLIMFloater* im_floater = LLIMFloater::findInstance(floater_id);
+		if (im_floater && im_floater->getStartConferenceInSameFloater())
+		{
+			// The IM floater should be initialized with a new session_id
+			// so that it is found by that id when creating a chiclet in LLIMFloater::onIMChicletCreated,
+			// and a new floater is not created.
+			im_floater->initIMSession(session_id);
+		}
+	}
+
 	bool new_session = !LLIMModel::getInstance()->findIMSession(session_id);
 
 	//works only for outgoing ad-hoc sessions
diff --git a/indra/newview/llimview.h b/indra/newview/llimview.h
index 9d19af4b62..58a2ac5162 100644
--- a/indra/newview/llimview.h
+++ b/indra/newview/llimview.h
@@ -347,10 +347,12 @@ public:
 
 	// Adds a session using a specific group of starting agents
 	// the dialog type is assumed correct. Returns the uuid of the session.
+	// A session can be added to a floater specified by floater_id.
 	LLUUID addSession(const std::string& name,
 					  EInstantMessage dialog,
 					  const LLUUID& other_participant_id,
-					  const LLDynamicArray<LLUUID>& ids, bool voice = false);
+					  const LLDynamicArray<LLUUID>& ids, bool voice = false,
+					  const LLUUID& floater_id = LLUUID::null);
 
 	/**
 	 * Creates a P2P session with the requisite handle for responding to voice calls.
diff --git a/indra/newview/llnearbychat.cpp b/indra/newview/llnearbychat.cpp
index 8b54c6ce53..e35dbf21d4 100644
--- a/indra/newview/llnearbychat.cpp
+++ b/indra/newview/llnearbychat.cpp
@@ -130,6 +130,7 @@ LLNearbyChat::LLNearbyChat(const LLSD& key)
 	mSpeakerMgr(NULL),
 	mExpandedHeight(COLLAPSED_HEIGHT + EXPANDED_HEIGHT)
 {
+	mIsNearbyChat = true;
 	mSpeakerMgr = LLLocalSpeakerMgr::getInstance();
 }
 
diff --git a/indra/newview/llpanelpeoplemenus.cpp b/indra/newview/llpanelpeoplemenus.cpp
index c84790d839..ac2109dda4 100644
--- a/indra/newview/llpanelpeoplemenus.cpp
+++ b/indra/newview/llpanelpeoplemenus.cpp
@@ -81,7 +81,7 @@ LLContextMenu* NearbyMenu::createMenu()
 		// Set up for multi-selected People
 
 		// registrar.add("Avatar.AddFriend",	boost::bind(&LLAvatarActions::requestFriendshipDialog,	mUUIDs)); // *TODO: unimplemented
-		registrar.add("Avatar.IM",			boost::bind(&LLAvatarActions::startConference,			mUUIDs));
+		registrar.add("Avatar.IM",			boost::bind(&LLAvatarActions::startConference,			mUUIDs, LLUUID::null));
 		registrar.add("Avatar.Call",		boost::bind(&LLAvatarActions::startAdhocCall,			mUUIDs));
 		registrar.add("Avatar.OfferTeleport",	boost::bind(&NearbyMenu::offerTeleport,					this));
 		registrar.add("Avatar.RemoveFriend",boost::bind(&LLAvatarActions::removeFriendsDialog,		mUUIDs));
diff --git a/indra/newview/llstartup.cpp b/indra/newview/llstartup.cpp
index 2f13ba5ab1..320a602916 100644
--- a/indra/newview/llstartup.cpp
+++ b/indra/newview/llstartup.cpp
@@ -2153,7 +2153,6 @@ bool idle_startup()
 
 		LLAgentPicksInfo::getInstance()->requestNumberOfPicks();
 
-		LLIMFloater::initIMFloater();
 		display_startup();
 
 		return TRUE;
diff --git a/indra/newview/lltoolbarview.cpp b/indra/newview/lltoolbarview.cpp
index 81ad96f39e..2b5acdc1e8 100644
--- a/indra/newview/lltoolbarview.cpp
+++ b/indra/newview/lltoolbarview.cpp
@@ -603,7 +603,7 @@ BOOL LLToolBarView::handleDragTool( S32 x, S32 y, const LLUUID& uuid, LLAssetTyp
 BOOL LLToolBarView::handleDropTool( void* cargo_data, S32 x, S32 y, LLToolBar* toolbar)
 {
 	BOOL handled = FALSE;
-	LLInventoryItem* inv_item = (LLInventoryItem*)cargo_data;
+	LLInventoryObject* inv_item = static_cast<LLInventoryObject*>(cargo_data);
 	
 	LLAssetType::EType type = inv_item->getType();
 	if (type == LLAssetType::AT_WIDGET)
diff --git a/indra/newview/lltooldraganddrop.cpp b/indra/newview/lltooldraganddrop.cpp
index 4f4eef0f3d..296ded6831 100644
--- a/indra/newview/lltooldraganddrop.cpp
+++ b/indra/newview/lltooldraganddrop.cpp
@@ -2527,7 +2527,7 @@ LLInventoryObject* LLToolDragAndDrop::locateInventory(
 			item = (LLViewerInventoryItem*)preview->getDragItem();
 		}
 	}
-	else if(mSource == SOURCE_VIEWER)
+	else if(mSource == SOURCE_VIEWER || mSource == SOURCE_PEOPLE)
 	{
 		item = (LLViewerInventoryItem*)gToolBarView->getDragItem();
 	}
diff --git a/indra/newview/lltooldraganddrop.h b/indra/newview/lltooldraganddrop.h
index 245c2a23e6..44980ffdb3 100644
--- a/indra/newview/lltooldraganddrop.h
+++ b/indra/newview/lltooldraganddrop.h
@@ -67,7 +67,8 @@ public:
 		SOURCE_WORLD,
 		SOURCE_NOTECARD,
 		SOURCE_LIBRARY,
-		SOURCE_VIEWER
+		SOURCE_VIEWER,
+		SOURCE_PEOPLE
 	};
 
 	void beginDrag(EDragAndDropType type,
diff --git a/indra/newview/llviewerassettype.cpp b/indra/newview/llviewerassettype.cpp
index a4b1c2155f..08ba5a5f25 100644
--- a/indra/newview/llviewerassettype.cpp
+++ b/indra/newview/llviewerassettype.cpp
@@ -83,6 +83,8 @@ LLViewerAssetDictionary::LLViewerAssetDictionary()
 	
 	addEntry(LLViewerAssetType::AT_WIDGET, 				new ViewerAssetEntry(DAD_WIDGET));
 	
+	addEntry(LLViewerAssetType::AT_PERSON, 				new ViewerAssetEntry(DAD_PERSON));
+
 	addEntry(LLViewerAssetType::AT_NONE, 				new ViewerAssetEntry(DAD_NONE));
 };
 
diff --git a/indra/newview/skins/default/xui/en/floater_im_session.xml b/indra/newview/skins/default/xui/en/floater_im_session.xml
index beeb4eea9b..21fc2d25d4 100644
--- a/indra/newview/skins/default/xui/en/floater_im_session.xml
+++ b/indra/newview/skins/default/xui/en/floater_im_session.xml
@@ -59,6 +59,7 @@
                  top="5"
                  width="31" />
              <button
+                 enabled="false"
                  follows="top|left"
                  height="25"
                  image_hover_unselected="Toolbar_Middle_Over"
@@ -69,8 +70,7 @@
                  top="5"
                  left_pad="4"
                  name="add_btn"
-                 width="31">
-             </button>   
+                 width="31"/>
              <button
                  follows="top|left"
                  height="25"
@@ -82,8 +82,7 @@
                  top="5"
                  left_pad="4"
                  name="voice_call_btn"
-                 width="31">
-             </button>
+                 width="31"/>
              <button
                  follows="right|top"
                  height="25"