ganeswidgets/inc/HgScrollBufferManager.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 19 Apr 2010 14:40:06 +0300
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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:
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*
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*/
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#ifndef HGSCROLLBUFFERMANAGER_H_
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#define HGSCROLLBUFFERMANAGER_H_
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#include <qobject>
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#include <QTimer>
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class HgScrollBufferManager: public QObject
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    {
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    Q_OBJECT
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public:
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    HgScrollBufferManager(
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            int bufferSize,
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            int bufferTreshold,
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            int initialPosition,
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            int totalCount);
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    virtual ~HgScrollBufferManager();
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    void resetBuffer(int aPosition, int aTotalCount);
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    void scrollPositionChanged(int newPosition);
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    bool positionInsideBuffer(int position);
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    void removeItems(int start, int end, int totalCount);
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    void addItems(int start, int end, int totalCount);
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    void moveItems(int start, int end, int target, int totalCount);
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    void currentBuffer(int& bufferStart, int& bufferEnd);
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signals:
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    void releaseItems(int releaseStart, int releaseEnd);
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    void requestItems(int requestStart, int requestEnd);
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protected slots:
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    void timeout();
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protected:
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    void init();
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    void asyncUpdate();
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    bool isInsideBuffer(int pos);
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    bool isInsideBuffer(int start, int end);
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private:
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    int mBufferSize;
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    int mBufferTreshold;
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    int mBufferPosition;
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    int mDiff;
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    int mTotalCount;
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    bool mResetOrdered;
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    int mRequestStart;
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    int mRequestCount;
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    int mReleaseStart;
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    int mReleaseCount;
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    QTimer mTimer;
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private:
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    Q_DISABLE_COPY(HgScrollBufferManager)
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    };
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#endif /*HGSCROLLBUFFERMANAGER_H_*/