mulwidgets/muldatamodel/inc/mulpagedatawindow.h
author Simon Howkins <simonh@symbian.org>
Tue, 16 Nov 2010 11:09:56 +0000
branchRCL_3
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parent 0 e83bab7cf002
permissions -rw-r--r--
Fixed path to IBY files to be exported
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/*
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* Copyright (c) 2007-2008 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:  Page by Page Data Window Implemenation
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*
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*/
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#ifndef MULPAGEDATAWINDOW_H_
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#define MULPAGEDATAWINDOW_H_
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#include "mulmodeldef.h"
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namespace Alf
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	{
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//Forward Declaration
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class MulModelImpl;
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/**
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 * Implametation of Data Window Class
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 * This class maintain offset for buffer item that are required by widget,
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 * so only that much item remain present in alf model instance.It update buffer items
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 * when highlight changed and notify model to update alf model if items are not present
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 * in Alf model.
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 * 
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 */
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class MulPageDataWindow
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	{
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public: //Constructor and Destructor
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	/**
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	 * C++ constructor
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	 * 
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	 * @param aMulModel refrece of model implementation
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	 */
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	MulPageDataWindow( MulModelImpl& aMulModel );
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	/**
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	 * Descturctor
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	 */
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	~MulPageDataWindow();
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public: //New Method
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	/**
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	 * Set window size
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	 * 
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	 * @param aWindowSize No of items that are visible on screen
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	 */
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	void SetWindowSize( int aWindowSize, int aPageTopIndex = KNotInitialized );
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	/**
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	 * Set Buffer size
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	 * Here buffser size mean number of items that will be above and below window
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	 * By default buffer size is equal to window size if following api is not called.
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	 *
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	 * @param aBufferSize Size of buffer
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	 */
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	void SetBufferSize( int aBufferSize );
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	/**
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	 * Change highlighted index. 
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	 * Changing highlight will check that data window needs to be updated or not 
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	 * and if required it update data window
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	 *
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	 * @aHighlightIndex New highlighted item in Data window
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	 * @throws invaid_argument exception
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	 */
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	void SetHighlight( int aHighlightIndex );
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	/**
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	 * Scroll Window to mention item index 
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	 * it will check that data window needs to be updated or not 
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	 * and if required it update data window
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	 *
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	 * @aItemIndex item index
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	 * @throws invaid_argument exception
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	 */
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	void ScrollWindow( int aPageTopIndex );
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	/**
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	 * Return Highlighted item's index
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	 * 
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	 * @return Highlighted item's index
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	 */
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	int Highlight() const
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		{
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		return mHighlight;
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		}
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	/**
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	 * Return previous top offset
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	 * 
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	 * @return Previos top offset
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	 */
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	int OldTopOffset() const
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		{
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		return mOldBufferTop;
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		}
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	/**
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	 * Return previous bottom offset
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	 * 
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	 * @return Previos bottom offset
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	 */
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	int OldBottomOffset() const
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		{
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		return mOldBufferBottom;
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		}
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   121
	
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	/**
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	 * Return current top offset
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	 * 
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	 * @return Current top offset
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	 */
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	int TopOffset() const
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		{
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		return mBufferTop;
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		}
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   131
	
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	/**
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	 * Return current bottom offset
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   134
	 * 
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	 * @return Current bottom offset
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	 */
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	int BottomOffset() const
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		{
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		return mBufferBottom;
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		}
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   141
	
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   142
	/**
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	 * Return visible window top offset
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	 * 
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	 * @return Current window top offset
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	 */
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	int TopWindowOffset() const
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		{
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		return mWindowTop;
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		}
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   151
	
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	/**
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	 * Return visible window bottom offset
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   154
	 * 
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	 *  @return Current window bottom offset
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	 */
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	int BottomWindowOffset() const
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		{
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   159
		return mWindowBottom;
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   160
		}
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   161
		
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   162
	/**
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	 * Return the Old Rear Top offset
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   164
	 * 
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	 * @return Old Rear Top offset
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	 */
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	int OldRearTopOffset() const
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		{
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		return mOldRearBufferTop;
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		}
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parents:
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   171
	
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   172
	/**
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   173
	 * Return the Old Rear Bottom offset
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   174
	 * 
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	 * @return Old Rear Bottom offset
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	 */
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   177
	int OldRearBottomOffset() const
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   178
		{
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		return mOldRearBufferBottom;
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		}		
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parents:
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   181
	
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   182
	/**
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	 * Return the Rear Top offset
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   184
	 * 
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	 * @return Rear Top offset
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   186
	 */
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   187
	int RearTopOffset() const
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		{
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   189
		return mRearBufferTop;
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   190
		}
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parents:
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   191
	
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   192
	/**
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   193
	 * Return the Rear Bottom offset
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parents:
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   194
	 * 
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   195
	 * @return Rear Bottom offset
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   196
	 */
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   197
	int RearBottomOffset() const
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   198
		{
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   199
		return mRearBufferBottom;
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   200
		}
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parents:
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   201
	
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   202
	/**
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   203
	 * Return buffer size
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   204
	 * 
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	 * @return Current buffer size
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   206
	 */
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   207
	int BufferSize() const
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		{
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   209
		return mBufferSize;
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		}
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parents:
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   211
		
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   212
	/**
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	 * Return window size
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   214
	 * 
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   215
	 * @return Current window size
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parents:
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   216
	 */
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   217
	int WindowSize() const
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   218
		{
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   219
		return mWindowSize;
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   220
		}		
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parents:
diff changeset
   221
	
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   222
	/**
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   223
	 * Check that items falls in data window or not
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parents:
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   224
	 * 
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	 * @param aItemIndex index of item
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	 * @return true if item is in data window otherwise false
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   227
	 */
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   228
	bool IsItemInDataWindow(int aItemIndex ) const;
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   229
	
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parents:
diff changeset
   230
	
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parents:
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   231
	/**
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parents:
diff changeset
   232
     * Check that items falls in visible window or not
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parents:
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   233
     * 
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   234
     * @param aItemIndex index of item
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     * @return true if item is in visible window otherwise false
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parents:
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   236
     */
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   237
	bool IsItemInVisibleWindow(int aItemIndex ) const;
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parents:
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   238
		
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parents:
diff changeset
   239
	/**
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   240
	 * Returns Relative index in datawindow from Absolute index
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parents:
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   241
	 *
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   242
	 * @param aAbsoluteIndex Absolute index
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	 * @return Relative index
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	 */
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	int RelativeIndex( int aAbsoluteIndex ) const;
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	/**
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	 * Returns Absoulte index from relative index
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	 *
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	 * @param aRelativeIndex Relative index
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	 * @return Absolute index
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	 */
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	int AbsoluteIndex( int aRelativeIndex ) const;
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	/**
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	 * Check that valid window size it set or not.
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	 * 
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	 * @return true - valid window size is set 
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	 * 		   false - otherwisze
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	 */
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	bool IsWindowEnabled() const
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		{
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		return ( mWindowSize != KNotInitialized );
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		}
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	/**
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	 * Adjust buffer offset according to window offset
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	 */
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	void AdjustBuffer();
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	/**
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	 * Return the complete buffer size, i.e. both top, bottom buffer and the window
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	 */	
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	int ActualBufferSize() const
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		{
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		return (2 * mBufferSize) + mWindowSize;	
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		}
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	/**
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	 * Change highlighted index. 
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	 * This change will not check that data window needs to be updated or not 
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	 *
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	 * @aHighlightIndex New highlighted item in Data window
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	 */
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	void UpdateHighlight( int aHighlightIndex );
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	/**
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	 * Adjust Window and buffer offset after insert or remove
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	 * 
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	 */
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	void AdjustOffset();
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	/**
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	 * Save old values
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	 */
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	void SaveOldValues()
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		{
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		mOldBufferTop = mBufferTop;
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		mOldBufferBottom = mBufferBottom;
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		mOldRearBufferTop = mRearBufferTop;
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		mOldRearBufferBottom = mRearBufferBottom;
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		}
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	/**
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	 * Compares the current and old buffer values and returns true if teh values are cahnged
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	 */
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	bool IsBufferOffsetChanged();					
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private://New Method
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	/**
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	 * Check that visible window need to be updated or not.
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	 * If required it update visible window.
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	 */
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	void UpdateDataWindow();
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	/**
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	 * Data window is updated and window need to sifted down
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	 */
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	//void ShiftWindowDown();
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	/**
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	 * Data window is updated and window need to sifted up
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	 */
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	//void ShiftWindowUp();
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private: // Data
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	MulModelImpl& mMulModel; //not own
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	int mHighlight;	
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	int mPageTopIndex;
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	int mOldPageTopIndex;
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	int mBufferSize;
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	int mWindowSize;
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	int mWindowTop;
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	int mWindowBottom;
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	int mBufferTop;
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	int mBufferBottom;
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	int mOldBufferTop;
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	int mOldBufferBottom;
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	int mRearBufferTop;
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	int mRearBufferBottom;
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	int mOldRearBufferTop;
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	int mOldRearBufferBottom;
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	};
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	} //namespace Alf
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#endif //MULPAGEDATAWINDOW_H_
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//End of file
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