photosgallery/viewframework/views/fullscreenview/inc/glxmediakeyutility.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 22:51:01 +0200
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/*
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* Copyright (c) 2008-2009 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:    Command object factory
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*
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*/
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#ifndef T_GLXMEDIAKEYUTILITY_H
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#define T_GLXMEDIAKEYUTILITY_H
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#include <ipvideo/ViaPlayerMediaKeyListener.h>	// MViaPlayerMediaKeyListener
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/**
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 * TGlxMediaKeyUtility
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 *
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 * This is a utility class that simplifies the use of RemCon  
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 * A problem results when an application instantiates more than one
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 * Instance of RemCon.
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 *
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 * This class enables other components to use the same instance on RemCon that the 
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 * It inherits from MRemConCoreApiTargetObserver and links with the RemConCoreApi.lib
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 * It inherits from MViaPlayerMediaKeyListener and links with the ViaPlayerUtilities.lib
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 * It interperets the keys from RemCon via the MediaKeyEventL method and translates them
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 * to standard key which get added to the application event queue for normal processing
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 * (Via OfferKeyEventL).
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 *
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 * Note that TranslateKeyEvent and DispatchKeyEvent methods are virtual.
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 * So if different behaviour is required just create a Sub class and overide
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 * those metheds are needed.
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 * 
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 */
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class CGlxMediaKeyUtility : public CBase, public MViaPlayerMediaKeyListener
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    {
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public:
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    /**
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    * Standard NewLC class used for Instantiation
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    * @return Instance of Itself, also on the cleanup stack
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    */
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    static CGlxMediaKeyUtility* NewLC();
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    /**
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    * Standard NewL class used for Instantiation
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    * @return Instance of Itself
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    */
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    static CGlxMediaKeyUtility* NewL();
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    /**
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    * Destructor
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    */
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    virtual ~CGlxMediaKeyUtility();
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protected:
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    /**
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    * Creates KeyEvent and places it on the application event queue.
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    *
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    * @param aKeyCode this is the action (up, down or click).
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    * @param aScanCode this is the TStdScanCode for the Key Event.
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    */
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    void DoSimulateKeyEvent( TRawEvent::TType aKeyCode, TStdScanCode aScanCode );
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    /**
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    * Converts RemCon key types to standard key types
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    *
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    * @param aOperationId the RemCon key type
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    *
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    * @return the standard key type
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    */
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    virtual TStdScanCode TranslateKeyEvent(TRemConCoreApiOperationId aOperationId);
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    /**
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    * Places the Key Event in the applications quere acording to aButtonAct (up, down, click)
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    *
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    * @param aButtonAct (up, down or click)
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    * @param aScanCode the standard scan code for a key
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    */
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    virtual void DispatchKeyEvent( TRemConCoreApiButtonAction aButtonAct, TStdScanCode aScanCode);
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private:
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    CGlxMediaKeyUtility();
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    void ConstructL();
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private: // from MViaPlayerMediaKeyListener
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    void MediaKeyEventL(TRemConCoreApiOperationId aOperationId, 
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                        TRemConCoreApiButtonAction aButtonAct );
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    };
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#endif
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