author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 19 Apr 2010 14:40:06 +0300 | |
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child 1 | e48454f237ca |
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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_*/ |