/*

* 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