--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmmw_plat/telephony_multimedia_service_api/inc/tmseffectobsrvr.h	Tue Feb 02 01:08:46 2010 +0200
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * This component and the accompanying materials are made available
+ * under the terms of "Eclipse Public License v1.0"
+ * which accompanies this distribution, and is available
+ * at the URL "http://www.eclipse.org/legal/epl-v10.html".
+ *
+ * Initial Contributors:
+ * Nokia Corporation - initial contribution.
+ *
+ * Contributors:
+ *
+ * Description:This class provides callback mechanism for TMSEffect listeners.
+ *
+ */
+
+#ifndef TMS_EFFECT_OBSRVR_H
+#define TMS_EFFECT_OBSRVR_H
+
+// Include files
+#include <tms.h>
+
+namespace TMS {
+
+// FORWARD DECLARATIONS
+class TMSEffect;
+
+/**
+ * TMSEffectObserver class
+ *
+ * This class provides callback mechanism for TMSEffect listeners.
+ *
+ * Client class that wants to receive events from TMSEffect concrete class
+ * objects must inherit from TMSEffectObserver class and register itself with
+ * the TMSEffect object.
+ *
+ * Functions declared in this class are called when effect events occur.
+ *
+ * The client must not do any blocking, or perform any CPU-intensive operations
+ * in the callback methods. It is recommended that the client saves event data,
+ * returns from this function immediately and if necessary, responds to
+ * the event in asynchronous way.
+ *
+ * Usage:
+ * <code>
+ * // Register as observer to TMSVolumeEffect
+ * iClient->AddObserver(*this);
+ * ...
+ * // Unregister (optional)
+ * iClient->RemoveObserver(*this);
+ * ...
+ * </code>
+ *
+ * @lib tmsapi.lib
+ *
+ */
+class TMSEffectObserver
+    {
+public:
+    /**
+     * Signal Effects event.
+     *
+     * This method is called when an Effects event occurs.
+     *
+     * Effect types:
+     *  TMS_EFFECT_GLOBAL_VOL
+     *  TMS_EFFECT_GLOBAL_GAIN
+     *  TMS_EFFECT_VOLUME
+     *  TMS_EFFECT_GAIN
+     *
+     * Notified events:
+     *  TMS_EVENT_EFFECT_VOL_CHANGED
+     *  TMS_EVENT_EFFECT_GAIN_CHANGED
+     *
+     * @param  tmseffect
+     *      Pointer to the object that is being signaled.
+     *
+     * @param  event
+     *      Event descriptor.
+     *
+     */
+    virtual void EffectsEvent(TMSEffect* tmseffect, TMSSignalEvent event) = 0;
+    };
+
+} //namespace TMS
+
+#endif // TMS_EFFECT_OBSRVR_H
+
+// End of file