/*

* Copyright (c) 2007 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:  DTMF buffer definition.

*

*/

#ifndef C_VTUIDTMFBUFFER_H

#define C_VTUIDTMFBUFFER_H

#include <e32base.h>

#include "mvtuinumbersource.h"

class CCoeEnv;

class TKeyEvent;

// Maximum size of the DTMF buffer

const TInt KVtUiDTMFBufferSize = 64;

/**

*

*  Base componentstate definition.

*

*  @since S60 v5.0

*/

class CVtUiDTMFBuffer : public CActive, public MVtUiNumberSource

    {

public:

    /**

    * Static construction method.

    * @param aCoeEnv Reference to CoeEnv object.

    * @return Pointer to newly created instance of CVtUiDTMFBuffer.

    */

    static CVtUiDTMFBuffer* NewL( const CCoeEnv& aCoeEnv );

    /**

    * C++ destructor.

    */

    ~CVtUiDTMFBuffer();

    /**

    * Append one character to DTMF buffer.

    * @param aChar Character to append.

    * @return ETrue if the given character was appended (i.e. it is a DTMF)

    */

    TBool Append( TChar aChar );

    /**

    * Clears the contents of the DTMF buffer.

    */

    void Reset();

    /**

    * Promote this instance as current number source.

    */

    void Activate();

    /**

    * Demote this instance from current number source position.

    */

    void Deactivate();

public: // from MVtUiNumberSource

    /**

    * @see MVtUiNumberSource::GetContents

    */

    void GetContents( TDes& aContents ) const;

private: // from CActive

    /**

    * @see CActive::DoCancel

    */

    void DoCancel();

    /**

    * @see CActive::RunL

    */

    void RunL();

private:

    /**

    * C++ constructor

    */

    CVtUiDTMFBuffer( const CCoeEnv& aCoeEnv );

    /**

    * 2nd constructor, may leave.

    */

    void ConstructL();

    /**

    * Starts buffer modification monitoring timer. If this timer expires,

    * buffer will be reset. Timer is restarted when new character is added to

    * the buffer.

    */

    void StartTimer();

    /**

    * Called when buffer modification monitoring timer has expired.

    */

    void TimerExpired( TInt aError );

    /**

    * Clears the contents of the DTMF buffer.

    */

    void ResetBuffer();

private:

    // Reference to coeenv

    const CCoeEnv& iCoeEnv;

    // Timer instance

    RTimer iTimer;

    // DTMF buffer

    TBuf< KVtUiDTMFBufferSize > iBuffer;

    };

#endif // C_VTUIDTMFBUFFER_H