1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 *  Version     : %version: 1 %

    17 */

    18 #ifndef HGBUFFERMANAGER_H_

    19 #define HGBUFFERMANAGER_H_

    20 

    21 class HgBufferManagerObserver;

    22 

    23 class HgBufferManager

    24 {

    25 public:    

    26     

    27     HgBufferManager(

    28                     HgBufferManagerObserver* aObserver,

    29                     int aBufferSize,

    30                     int aBufferTreshold,

    31                     int aInitialPosition,

    32                     int aTotalCount );

    33 	~HgBufferManager();

    34 

    35 	void setPosition( int aIndex );

    36 	void resetBuffer( int aPosition, int aTotalCount);

    37 	void itemCountChanged( int aIndex, bool aRemoved, int aNewTotalCount );

    38 	void resizeCache(int newSize, int newTreshold);

    39 	

    40 private:

    41 	void calculate();

    42 

    43 private:

    44 	HgBufferManagerObserver* mObserver; 

    45     

    46 	int mBufferSize;

    47 	int mBufferTreshold;

    48 	int mBufferPosition;

    49 	int mDiff;

    50 	int mTotalCount;

    51 

    52 	bool mResetOrdered;

    53 

    54 	int mRequestStart;

    55 	int mRequestCount;

    56 	int mReleaseStart;

    57 	int mReleaseCount;

    58 };

    59 

    60 #endif // HGBUFFERMANAGER_H_