--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ganeswidgets/inc/HgScrollBufferManager.h	Mon Apr 19 14:40:06 2010 +0300
@@ -0,0 +1,86 @@
+/*
+* Copyright (c) 2009 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:
+*
+*/
+
+
+#ifndef HGSCROLLBUFFERMANAGER_H_
+#define HGSCROLLBUFFERMANAGER_H_
+
+#include <qobject>
+#include <QTimer>
+
+class HgScrollBufferManager: public QObject
+    {
+    Q_OBJECT
+public:
+
+    HgScrollBufferManager(
+            int bufferSize,
+            int bufferTreshold,
+            int initialPosition,
+            int totalCount);
+
+    virtual ~HgScrollBufferManager();
+
+    void resetBuffer(int aPosition, int aTotalCount);
+
+    void scrollPositionChanged(int newPosition);
+
+    bool positionInsideBuffer(int position);
+
+    void removeItems(int start, int end, int totalCount);
+    void addItems(int start, int end, int totalCount);
+    void moveItems(int start, int end, int target, int totalCount);
+
+    void currentBuffer(int& bufferStart, int& bufferEnd);
+
+signals:
+
+    void releaseItems(int releaseStart, int releaseEnd);
+    void requestItems(int requestStart, int requestEnd);
+
+protected slots:
+
+    void timeout();
+
+protected:
+
+    void init();
+    void asyncUpdate();
+    bool isInsideBuffer(int pos);
+    bool isInsideBuffer(int start, int end);
+
+private:
+
+    int mBufferSize;
+    int mBufferTreshold;
+    int mBufferPosition;
+    int mDiff;
+    int mTotalCount;
+
+    bool mResetOrdered;
+
+    int mRequestStart;
+    int mRequestCount;
+    int mReleaseStart;
+    int mReleaseCount;
+    QTimer mTimer;
+
+private:
+    Q_DISABLE_COPY(HgScrollBufferManager)
+    };
+
+#endif /*HGSCROLLBUFFERMANAGER_H_*/