diff -r 000000000000 -r e83bab7cf002 mulwidgets/muldatamodel/src/muldatawindow.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mulwidgets/muldatamodel/src/muldatawindow.cpp	Thu Dec 17 08:56:02 2009 +0200
@@ -0,0 +1,498 @@
+/*
+* Copyright (c) 2007-2008 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:  Implementation of Data window
+*
+*/
+
+
+//Includes
+#include "muldatawindow.h"
+
+#include <stdexcept>
+#include <e32debug.h>
+
+//Internal includes
+#include "mulassert.h"
+#include "mulmodelimpl.h"
+#include "mullog.h"
+
+using namespace std;
+
+namespace Alf
+    {
+    
+// ---------------------------------------------------------------------------
+// MulDataWindow
+// ---------------------------------------------------------------------------
+//
+MulDataWindow::MulDataWindow( MulModelImpl& aMulModel )
+			  :mMulModel( aMulModel ),
+			   mHighlight(KNotInitialized),
+			   mItemIndex(KNotInitialized),
+			   mOldItemIndex(KNotInitialized),
+			   mBufferSize(KNotInitialized),
+			   mWindowSize(KNotInitialized),
+			   mWindowOffset(KNotInitialized),
+			   mWindowTop(0),
+			   mWindowBottom(0),
+			   mBufferTop(0),
+			   mBufferBottom(0),
+			   mOldBufferTop(KNotInitialized),
+			   mOldBufferBottom(KNotInitialized),
+			   mRearBufferTop(0),
+			   mRearBufferBottom(0),
+			   mOldRearBufferTop(KNotInitialized),
+			   mOldRearBufferBottom(KNotInitialized)
+	{	
+	}
+
+// ---------------------------------------------------------------------------
+// SetWindowSize
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::SetWindowSize( int aWindowSize )
+	{
+	MUL_LOG_ENTRY_EXIT("MUL::MulDataWindow::SetWindowSize()"); 
+	
+	__MUL_ASSERT( aWindowSize > 0, KLInvalidArgument );
+	
+	if( mWindowSize != aWindowSize )
+		{
+		if( KNotInitialized == mBufferSize )
+			{
+			mBufferSize = aWindowSize;			
+			}
+			
+		mWindowSize = aWindowSize;
+		//devide window half 
+		//Try to keep this much item above highlight and below highlight
+		mWindowOffset = mWindowSize / 2; 
+		
+		//adjusting window offset
+		//if window size changes then the top and bottom offset should be 
+		// adjusted such that highlight remains at the centre
+		//window top and bottom are inclusive
+		
+		mWindowTop = mItemIndex - mWindowOffset;	
+		mWindowTop = mWindowTop < 0 ? 0 : mWindowTop ;		
+		mWindowBottom = mWindowTop + mWindowSize - 1;
+		mWindowBottom = mWindowBottom >= mMulModel.CurrentItemCount() ? (mMulModel.CurrentItemCount() -1) : mWindowBottom;	
+		
+		MUL_LOG_INFO2("MUL::MulDataWindow::SetWindowSize() mWindowTop:%d,mWindowBottom:%d",mWindowTop,mWindowBottom); 
+		
+		AdjustBuffer();
+		mMulModel.DataWindowUpdated();
+		}
+	//else nothing needed
+	}
+	
+// ---------------------------------------------------------------------------
+// SetBufferSize
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::SetBufferSize( int aBufferSize )
+	{
+	MUL_LOG_ENTRY_EXIT("MUL::MulDataWindow::SetBufferSize()"); 
+	
+	__MUL_ASSERT( aBufferSize > 0, KLInvalidArgument );
+	
+	if( mBufferSize != aBufferSize )
+		{			
+		mBufferSize = aBufferSize;
+		
+		if(mMulModel.CurrentItemCount() > 0)
+			{
+			AdjustBuffer();
+			mMulModel.DataWindowUpdated();
+			}
+		}
+	//else nothing needed
+	}
+
+// ---------------------------------------------------------------------------
+// ~MulDataWindow
+// ---------------------------------------------------------------------------
+//
+MulDataWindow::~MulDataWindow()
+	{
+	// do nothing
+	}
+
+// ---------------------------------------------------------------------------
+// SetHighlight
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::SetHighlight( int aHighlightIndex )
+	{
+	MUL_LOG_INFO2("MUL::MulDataWindow::SetHighlight() mHighlight:%d,modelCount:%d",aHighlightIndex,mMulModel.CurrentItemCount()); 
+	
+	__MUL_ASSERT( aHighlightIndex >= 0 && aHighlightIndex <= mMulModel.CurrentItemCount()-1, KLInvalidArgument );
+	
+	if( mHighlight != aHighlightIndex )
+		{
+		mHighlight = aHighlightIndex; 
+	
+		ScrollWindow( mHighlight );
+		}
+	//else same highlight
+	}
+
+
+// ---------------------------------------------------------------------------
+// UpdateHighlight
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::UpdateHighlight( int aHighlightIndex )
+	{
+	// No need to assert. We should send highlight -1 when all the items are removed.
+	// Widget should handle. to show emty text visualization
+	mHighlight = aHighlightIndex; 
+	}
+		
+// ---------------------------------------------------------------------------
+// ScrollWindow
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::ScrollWindow( int aItemIndex )
+	{
+	MUL_LOG_INFO2("MUL::MulDataWindow::ScrollWindow() aItemIndex:%d,modelCount:%d",aItemIndex,mMulModel.CurrentItemCount()); 
+	
+	__MUL_ASSERT( aItemIndex >= 0 && aItemIndex <= mMulModel.CurrentItemCount()-1, KLInvalidArgument );
+	
+	if( mItemIndex != aItemIndex )
+		{
+		mOldItemIndex = mItemIndex;
+		mItemIndex = aItemIndex; 
+	
+        if(IsWindowEnabled())
+	        {
+		    UpdateDataWindow();
+	        }
+		}
+	//else same highlight
+	}
+
+
+// ---------------------------------------------------------------------------
+// UpdateDataWindow
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::UpdateDataWindow()
+	{
+#ifdef _DEBUG
+	int diff = mItemIndex - mOldItemIndex;
+#endif //_DEBUG 
+	
+	//If diffrence is negative than highlight is moved up else down
+	(( mItemIndex - mOldItemIndex ) < 0 ) ? ShiftWindowUp() : ShiftWindowDown() ;
+	}
+
+// ---------------------------------------------------------------------------
+// ShiftWindowDown
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::ShiftWindowDown()
+	{
+	MUL_LOG_ENTRY_EXIT("MUL::MulDataWindow::ShiftWindowDown()");  
+	MUL_LOG_INFO2("MUL::MulDataWindow::ShiftWindowDown() mItemIndex:%d,mWindowBottom:%d",mItemIndex,mWindowBottom); 
+	
+	if( mItemIndex > mWindowBottom )
+		{
+		mWindowTop = mItemIndex - mWindowOffset;
+		mWindowBottom = mWindowTop + mWindowSize -1;
+		//bottom is exceeding model count
+		mWindowBottom = mWindowBottom >= mMulModel.CurrentItemCount() ? 
+						mWindowBottom = mMulModel.CurrentItemCount() - 1 : mWindowBottom;
+		
+		mWindowTop = mWindowBottom - mWindowSize + 1;
+		//top can't be negative
+		mWindowTop = mWindowTop < 0 ? 0 : mWindowTop ;
+		
+		MUL_LOG_INFO2("MUL::MulDataWindow::ShiftWindowDown() mWindowTop:%d,mWindowBottom:%d",mWindowTop,mWindowBottom); 
+		SaveOldValues();
+		AdjustBuffer();
+		mMulModel.DataWindowUpdated();
+		}
+	//else nothing needed
+	}
+
+// ---------------------------------------------------------------------------
+// ShiftWindowUp
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::ShiftWindowUp()
+	{
+	MUL_LOG_ENTRY_EXIT("MUL::MulDataWindow::ShiftWindowUp() Start");  
+	MUL_LOG_INFO2("MUL::MulDataWindow::ShiftWindowUp() mItemIndex:%d,mWindowBottom:%d",mItemIndex,mWindowBottom); 
+	
+	if( mItemIndex < mWindowTop )
+		{
+		mWindowTop = mItemIndex - mWindowOffset;
+		//top can't be negative
+		mWindowTop = mWindowTop < 0 ? 0 : mWindowTop ;
+		
+		mWindowBottom = mWindowTop + mWindowSize -1;
+		
+		//bottom cant exceed model count
+		mWindowBottom = mWindowBottom >= mMulModel.CurrentItemCount() ? 
+						mWindowBottom = mMulModel.CurrentItemCount() - 1 : mWindowBottom;
+		
+		MUL_LOG_INFO2("MUL::MulDataWindow::ShiftWindowUp() mWindowTop:%d,mWindowBottom:%d",mWindowTop,mWindowBottom); 
+		
+		SaveOldValues();
+		AdjustBuffer();
+		mMulModel.DataWindowUpdated();
+		}
+	//else nothing needed
+	}
+
+// ---------------------------------------------------------------------------
+// AdjustBuffer
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::AdjustBuffer()
+	{
+	MUL_LOG_ENTRY_EXIT("MUL::MulDataWindow::AdjustBuffer()");  
+	
+	int modelCount = mMulModel.CurrentItemCount() -1;
+		
+	//remove data is new window is smaller/add is new window is bigger
+	if( mWindowTop == 0 && ActualBufferSize() <= modelCount )
+		{
+		MUL_LOG_INFO("MUL::MulDataWindow::AdjustBuffer() mWindowTop == 0 ");  		
+		
+		mBufferTop = mWindowTop;
+		mBufferBottom = mBufferTop + mWindowSize + mBufferSize - 1;
+		
+		//Create rear top and rear bottom only in looping case
+		//window top is zero so data at other end should be buffered
+		mRearBufferBottom = modelCount;
+		mRearBufferTop = mRearBufferBottom - mBufferSize +1;		
+		}
+	else if( mWindowBottom == modelCount && ActualBufferSize() <= modelCount )
+		{
+		MUL_LOG_INFO("MUL::MulDataWindow::AdjustBuffer() mWindowBottom == modelCount ");  
+		
+		mBufferBottom = mWindowBottom ;
+		mBufferTop = mBufferBottom - (mWindowSize + mBufferSize) + 1;
+		
+		//Create rear top and rear bottom only in looping case
+		//window bottom is equal to model count so data at other end should be buffered
+		mRearBufferTop = 0;
+		mRearBufferBottom = mRearBufferTop + mBufferSize -1;
+		}
+	else
+		{
+		MUL_LOG_INFO("MUL::MulDataWindow::AdjustBuffer() else ");  
+		
+		mBufferTop = mWindowTop - mBufferSize;
+		mBufferBottom = mWindowBottom + mBufferSize;
+		
+		//check if top or bottom is out of bound and update offset accordingly
+		if( mBufferTop < 0 )
+			{
+			MUL_LOG_INFO("MUL::MulDataWindow::AdjustBuffer() mBufferTop < 0 "); 
+			
+			mBufferTop = 0;
+			mBufferBottom = mBufferTop + ActualBufferSize()  - 1;
+			//buffer bottom cant be larger then model count
+			mBufferBottom = mBufferBottom > modelCount ? modelCount : mBufferBottom;
+			}
+		else if( mBufferBottom > modelCount )
+			{
+			MUL_LOG_INFO("MUL::MulDataWindow::AdjustBuffer() mBufferBottom > modelCount"); 
+			
+			mBufferBottom = modelCount ;
+			mBufferTop = mBufferBottom - ActualBufferSize() + 1;
+			//buffer top cant be less then 0
+			mBufferTop = mBufferTop < 0 ? 0 : mBufferTop;
+			}
+		
+		//in other case rear top and rear bottom is not use set to -1
+		mRearBufferTop = KNotInitialized;
+		mRearBufferBottom = KNotInitialized;
+		}
+	
+	MUL_LOG_INFO2("MUL::MulDataWindow::AdjustBuffer() mOldBufferTop:%d,mOldBufferBottom:%d",mOldBufferTop,mOldBufferBottom); 
+	MUL_LOG_INFO2("MUL::MulDataWindow::AdjustBuffer() mOldRearBufferBottom:%d,mOldRearBufferTop:%d",mOldRearBufferBottom,mOldRearBufferTop); 
+	
+	MUL_LOG_INFO2("MUL::MulDataWindow::AdjustBuffer() mBufferTop:%d,mBufferBottom:%d",mBufferTop,mBufferBottom); 
+	MUL_LOG_INFO2("MUL::MulDataWindow::AdjustBuffer() mRearBufferBottom:%d,mRearBufferTop:%d",mRearBufferBottom,mRearBufferTop); 
+
+	__MUL_ASSERT_DEBUG( mWindowTop >= 0 && mWindowBottom < mMulModel.CurrentItemCount(), _L("Invlid Window"));
+	__MUL_ASSERT_DEBUG( mBufferTop >= 0 && mBufferBottom < mMulModel.CurrentItemCount(), _L("Invlid Buffer"));
+	}
+		
+// ---------------------------------------------------------------------------
+// IsItemInDataWindow
+// ---------------------------------------------------------------------------
+//
+bool MulDataWindow::IsItemInDataWindow(int aItemIndex ) const
+	{
+	//__MUL_ASSERT_DEBUG( aItemIndex >= 0 && aItemIndex <= mMulModel.CurrentItemCount()-1, KLInvalidArgument );
+	
+	bool result( false );
+	
+	if(mWindowSize == KNotInitialized )
+		{
+		result = false;
+		}
+	//check that rear buffer is on or not in looping case
+	else if( mRearBufferTop != KNotInitialized && mRearBufferBottom != KNotInitialized )
+		{
+		if( ( aItemIndex >= mBufferTop &&  aItemIndex <= mBufferBottom ) || 
+			( aItemIndex >= mRearBufferTop &&  aItemIndex <= mRearBufferBottom )	)
+			{
+			result = true;
+			}
+		}
+	else if( aItemIndex >= mBufferTop &&  aItemIndex <= mBufferBottom )
+		{
+		result = true;
+		}
+	return result;
+	}
+	
+
+// ---------------------------------------------------------------------------
+// RelativeIndex
+// ---------------------------------------------------------------------------
+//
+int MulDataWindow::RelativeIndex( int aAbsoluteIndex ) const
+	{
+	__MUL_ASSERT_DEBUG( aAbsoluteIndex >= 0 && aAbsoluteIndex <= mMulModel.CurrentItemCount()-1, KLInvalidArgument );
+	
+	if( !IsItemInDataWindow(aAbsoluteIndex) )
+	    {
+	    return -1;
+	    }
+	
+	if( mRearBufferTop != KNotInitialized && mRearBufferBottom != KNotInitialized )
+		{
+		if( mRearBufferBottom == mMulModel.CurrentItemCount() - 1 )
+			{
+			if( aAbsoluteIndex >= mRearBufferTop && aAbsoluteIndex <= mRearBufferBottom )	
+				{
+				int bufferSize = BottomOffset() - TopOffset() + 1;
+				int rearDiff = aAbsoluteIndex - mRearBufferTop;
+				int relativeIndex = bufferSize + rearDiff;
+				return relativeIndex;
+				}
+			else
+				{
+				int relativeIndex = aAbsoluteIndex < TopOffset() ? 
+									aAbsoluteIndex : aAbsoluteIndex - TopOffset() ;	
+				return relativeIndex;	
+				}		
+			}
+		else
+			{
+			if( aAbsoluteIndex >= mRearBufferTop && aAbsoluteIndex <= mRearBufferBottom )
+				{
+				int relativeIndex = aAbsoluteIndex < TopOffset() ? 
+									aAbsoluteIndex : aAbsoluteIndex - TopOffset() ;	
+				return relativeIndex;	
+				}
+			else
+				{	
+				int bufferSize = mRearBufferBottom - mRearBufferTop + 1;
+				int diff = aAbsoluteIndex - TopOffset();
+				int relativeIndex = bufferSize + diff;
+				return relativeIndex;		
+				}
+			}
+		}
+	else
+		{		
+		int relativeIndex = aAbsoluteIndex < TopOffset() ? 
+							aAbsoluteIndex : aAbsoluteIndex - TopOffset() ;	
+		return relativeIndex;
+		}
+	}
+
+// ---------------------------------------------------------------------------
+// AbsoluteIndex
+// ---------------------------------------------------------------------------
+//
+int MulDataWindow::AbsoluteIndex( int aRelativeIndex ) const
+	{
+	__MUL_ASSERT_DEBUG( aRelativeIndex >= 0 && aRelativeIndex <= ActualBufferSize(), _L("Invalid Relative Index"));
+	
+	if( mRearBufferTop != KNotInitialized && mRearBufferBottom != KNotInitialized )
+		{
+		if( mRearBufferBottom == mMulModel.CurrentItemCount() - 1 )
+			{
+			if( aRelativeIndex > BottomOffset() )
+				{
+				//relative index is in loop buffer
+				int diff = aRelativeIndex - BottomOffset() - 1;
+				int absoluteIndex = RearTopOffset() + diff;
+				return absoluteIndex;
+				}
+			else
+				{
+				int absoluteIndex = TopOffset() + aRelativeIndex;
+				return absoluteIndex;
+				}
+			}
+		else
+			{
+			if( aRelativeIndex <= RearBottomOffset() )
+				{
+				//relative index is in loop buffer
+				int absoluteIndex = RearTopOffset() + aRelativeIndex;
+				return absoluteIndex;
+				}
+			else
+				{
+				int diff = aRelativeIndex - RearBottomOffset() - 1;
+				int absoluteIndex = TopOffset() + diff;
+				return absoluteIndex;
+				}
+			}
+		}
+	else
+		{		
+		int absoluteIndex = TopOffset() + aRelativeIndex;
+		return absoluteIndex;
+		}
+	}
+
+// ---------------------------------------------------------------------------
+// SetVisibleWindow
+// ---------------------------------------------------------------------------
+//
+void MulDataWindow::SetVisibleWindow(int aWindowTop, int aWindowBottom)
+	{	
+	mWindowTop = aWindowTop;
+	mWindowBottom = aWindowBottom;
+	}
+
+// ---------------------------------------------------------------------------
+// IsBufferOffsetChanged
+// ---------------------------------------------------------------------------
+//
+bool MulDataWindow::IsBufferOffsetChanged()
+	{
+	if(mRearBufferBottom != mOldRearBufferBottom || mRearBufferTop != mOldRearBufferTop
+		|| mBufferTop != mOldBufferTop || mBufferBottom != mOldBufferBottom)
+		{
+		return true;
+		}
+	return false;
+	}
+			
+    } // namespace Alf
+
+//End of file