vtuis/videotelui/inc/cvtuidtmfbuffer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:21:33 +0200
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/*
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* Copyright (c) 2007 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:  DTMF buffer definition.
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*
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*/
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#ifndef C_VTUIDTMFBUFFER_H
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#define C_VTUIDTMFBUFFER_H
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#include <e32base.h>
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#include "mvtuinumbersource.h"
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class CCoeEnv;
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class TKeyEvent;
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// Maximum size of the DTMF buffer
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const TInt KVtUiDTMFBufferSize = 64;
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/**
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*  TVtUiBaseComponentState
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*
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*  Base componentstate definition.
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*
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*  @since S60 v5.0
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*/
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class CVtUiDTMFBuffer : public CActive, public MVtUiNumberSource
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    {
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public:
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    /**
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    * Static construction method.
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    * @param aCoeEnv Reference to CoeEnv object.
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    * @return Pointer to newly created instance of CVtUiDTMFBuffer.
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    */
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    static CVtUiDTMFBuffer* NewL( const CCoeEnv& aCoeEnv );
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    /**
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    * C++ destructor.
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    */
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    ~CVtUiDTMFBuffer();
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    /**
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    * Append one character to DTMF buffer.
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    * @param aChar Character to append.
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    * @return ETrue if the given character was appended (i.e. it is a DTMF)
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    */
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    TBool Append( TChar aChar );
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    /**
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    * Clears the contents of the DTMF buffer.
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    */
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    void Reset();
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    /**
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    * Promote this instance as current number source.
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    */
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    void Activate();
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    /**
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    * Demote this instance from current number source position.
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    */
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    void Deactivate();
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public: // from MVtUiNumberSource
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    /**
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    * @see MVtUiNumberSource::GetContents
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    */
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    void GetContents( TDes& aContents ) const;
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private: // from CActive
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    /**
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    * @see CActive::DoCancel
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    */
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    void DoCancel();
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    /**
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    * @see CActive::RunL
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    */
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    void RunL();
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private:
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    /**
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    * C++ constructor
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    */
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    CVtUiDTMFBuffer( const CCoeEnv& aCoeEnv );
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    /**
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    * 2nd constructor, may leave.
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    */
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    void ConstructL();
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    /**
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    * Starts buffer modification monitoring timer. If this timer expires,
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    * buffer will be reset. Timer is restarted when new character is added to
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    * the buffer.
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    */
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    void StartTimer();
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    /**
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    * Called when buffer modification monitoring timer has expired.
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    */
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    void TimerExpired( TInt aError );
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    /**
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    * Clears the contents of the DTMF buffer.
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    */
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    void ResetBuffer();
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private:
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    // Reference to coeenv
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    const CCoeEnv& iCoeEnv;
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    // Timer instance
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    RTimer iTimer;
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    // DTMF buffer
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    TBuf< KVtUiDTMFBufferSize > iBuffer;
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    };
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#endif // C_VTUIDTMFBUFFER_H