author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 25 May 2010 13:16:00 +0300 | |
branch | RCL_3 |
changeset 18 | 2eb3b066cc7d |
parent 13 | f5c5c82a163e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: This class provides callback mechanism for TMSEffect listeners. |
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* |
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*/ |
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#ifndef TMS_EFFECT_OBSRVR_H |
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#define TMS_EFFECT_OBSRVR_H |
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// Include files |
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#include <tms.h> |
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namespace TMS { |
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// FORWARD DECLARATIONS |
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class TMSEffect; |
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|
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/** |
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* TMSEffectObserver class |
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* |
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* This class provides callback mechanism for TMSEffect listeners. |
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* |
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* Client class that wants to receive events from TMSEffect concrete class |
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* objects must inherit from TMSEffectObserver class and register itself with |
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* the TMSEffect object. |
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* |
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* Functions declared in this class are called when effect events occur. |
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* |
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* The client must not do any blocking, or perform any CPU-intensive operations |
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* in the callback methods. It is recommended that the client saves event data, |
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* returns from this function immediately and if necessary, responds to |
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* the event in asynchronous way. |
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* |
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* Usage: |
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* <code> |
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* // Register as observer to TMSVolumeEffect |
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* iClient->AddObserver(*this); |
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* ... |
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* // Unregister (optional) |
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* iClient->RemoveObserver(*this); |
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* ... |
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* </code> |
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* |
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* @lib tmsapi.lib |
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* |
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*/ |
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class TMSEffectObserver |
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{ |
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public: |
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/** |
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* Signal Effects event. |
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* |
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* This method is called when an Effects event occurs. |
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* |
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* Effect types: |
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* TMS_EFFECT_GLOBAL_VOL |
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* TMS_EFFECT_GLOBAL_GAIN |
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* TMS_EFFECT_VOLUME |
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* TMS_EFFECT_GAIN |
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* |
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* Notified events: |
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* TMS_EVENT_EFFECT_VOL_CHANGED |
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* TMS_EVENT_EFFECT_GAIN_CHANGED |
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* |
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* @param tmseffect |
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* Reference to the object that is being signaled. |
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* |
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* @param event |
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* Event descriptor. |
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* |
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*/ |
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virtual void EffectsEvent(const TMSEffect& tmseffect, |
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TMSSignalEvent event) = 0; |
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}; |
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} //namespace TMS |
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#endif // TMS_EFFECT_OBSRVR_H |
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// End of file |