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+/** 
+ * @file llspeakingindicatormanager.h
+ * @author Mike Antipov
+ * @brief Interfeace of LLSpeackerIndicator class to be processed depend on avatars are in the same voice channel.
+ * Also register/unregister methods for this class are declared
+ *
+ * $LicenseInfo:firstyear=2010&license=viewergpl$
+ * 
+ * Copyright (c) 2010, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLSPEAKINGINDICATORMANAGER_H
+#define LL_LLSPEAKINGINDICATORMANAGER_H
+
+class LLSpeakingIndicator
+{
+public:
+	virtual void switchIndicator(bool switch_on) = 0;
+};
+
+// See EXT-3976.
+namespace LLSpeakingIndicatorManager
+{
+	/**
+	 * Stores passed speaking indicator to control its visibility.
+	 *
+	 * Registered indicator is set visible if an appropriate avatar is in the same voice channel with Agent.
+	 * It ignores instances of Agent's indicator.
+	 *
+	 * @param speaker_id LLUUID of an avatar whose speaker indicator is registered.
+	 * @param speaking_indicator instance of the speaker indicator to be registered.
+	 */
+	void registerSpeakingIndicator(const LLUUID& speaker_id, LLSpeakingIndicator* const speaking_indicator);
+
+	/**
+	 * Removes passed speaking indicator from observing.
+	 *
+	 * @param speaker_id LLUUID of an avatar whose speaker indicator should be unregistered.
+	 * @param speaking_indicator instance of the speaker indicator to be unregistered.
+	 */
+	void unregisterSpeakingIndicator(const LLUUID& speaker_id, const LLSpeakingIndicator* const speaking_indicator);
+}
+
+#endif // LL_LLSPEAKINGINDICATORMANAGER_H