mulwidgets/muldatamodel/src/mulpushmode.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:56:02 +0200
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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:  Base implementation of pull and push mode
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 *
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*/
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//Includes
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#include "mulpushmode.h"
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#include "mulassert.h"
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#include "mulcachemanager.h"
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#include "mulpagedatawindow.h"
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#include "mullog.h"
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namespace Alf
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    { 
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// ---------------------------------------------------------------------------
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// MulPushMode()
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// ---------------------------------------------------------------------------
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//
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MulPushMode::MulPushMode( MulPageDataWindow& aDataWindow )
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			: mDataWindow(aDataWindow)
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	{   	
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	mCacheManager.reset( new ( EMM ) MulCacheManager());		
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	}
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// ---------------------------------------------------------------------------
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// ~MulPushMode()
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// ---------------------------------------------------------------------------
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//
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MulPushMode::~MulPushMode()
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	{
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	// No implementation is required.
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	}
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// ---------------------------------------------------------------------------
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// Insert
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// ---------------------------------------------------------------------------
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//
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bool MulPushMode::Insert(int aIndex, int aCount, const MulDataPath& aPath )
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	{
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	__MUL_ASSERT( aIndex >= 0 && aIndex <= mCacheManager->ExpandedNodeCount() && aCount > 0, KLInvalidArgument );
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	int modelCountBefore  = mCacheManager->ExpandedNodeCount();	
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	mCacheManager->CreateNodes( aIndex, aCount, aPath );
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	int modelCount = mCacheManager->ExpandedNodeCount();
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	// if there is a change in expanded node count of model then update
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	// the alf model. THis case would happen if we are inserting childnodes
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	// for a node which is not expanded. Then no need to update the alf model
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	if(mDataWindow.IsWindowEnabled() && modelCount != modelCountBefore)
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		{
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		ModelCountChanged(modelCountBefore,modelCount);
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		}
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	// The highlight is the same but its relative index is changed 
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	// because the buffer offsets are changed. Even in this case widget has to update the visualization
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	return false;
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	}
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// ---------------------------------------------------------------------------
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// Remove
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// ---------------------------------------------------------------------------
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//
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bool MulPushMode::Remove( int aIndex, int aCount,const MulDataPath& aPath)
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	{
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	__MUL_ASSERT( aIndex >= 0 && aCount > 0 && aIndex+aCount <= mCacheManager->ExpandedNodeCount(), KLInvalidArgument );
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	int modelCountBefore  = mCacheManager->ExpandedNodeCount();
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	mCacheManager->RemoveVisualItem( aIndex, aCount, aPath );
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	int modelCount = mCacheManager->ExpandedNodeCount();
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	// To inform the calling class whether the highlight has changed 
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	// If the current highlight is more than the total number of items. Then udjust teh highlight
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	bool highlightUpdated = ValidateCurrentHighlight();
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	// if there is a change in expanded node count of model then update
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	// the alf model. This case would happen if we are removing childnodes
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	// for a node which is not expanded. Then no need to update the alf model			
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	if(mDataWindow.IsWindowEnabled() && modelCount != modelCountBefore)
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		{
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		ModelCountChanged(modelCountBefore,modelCount);
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		}
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	// If the highlight is changed because it was greater than current model count or if
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	// the buffer offsets are changed then return true		
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	return ( highlightUpdated );
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	}
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// ---------------------------------------------------------------------------
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// Update
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::Update(int /*aIndex*/, int /*aCount*/, const MulDataPath& /*aPath*/)
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    {
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    //no implementation required
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    }
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// ---------------------------------------------------------------------------
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// Refresh
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::Refresh( int /*aCount*/, const MulDataPath& /*aPath*/)
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    {
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    // throw exception not implemented in push mode 
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    throw std::logic_error("Not Implemented");
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    }
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// ---------------------------------------------------------------------------
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// SetTemplate
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::SetTemplate( mulwidget::TLogicalTemplate aTemplateId )
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    {
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    mDefaultTemplate =  aTemplateId ;
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    MulDataPath path;
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    for( int i = 0 ; i < mCacheManager->Count() ; i++ )
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        {
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        MulPushMode::SetTemplate( i, mDefaultTemplate, path );           
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        }
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    }
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// ---------------------------------------------------------------------------
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// Template
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// ---------------------------------------------------------------------------
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//
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mulwidget::TLogicalTemplate MulPushMode::Template( ) 
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    {
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    return mDefaultTemplate;
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    }
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// ---------------------------------------------------------------------------
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// Data
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// ---------------------------------------------------------------------------
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//
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const MulVisualItem* MulPushMode::Data( int aIndex, const MulDataPath& /*aPath*/) const
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	{
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	__MUL_ASSERT( aIndex >= 0 && aIndex < mCacheManager->ExpandedNodeCount(), KLInvalidArgument );
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	return mCacheManager->Data( aIndex );			
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	}
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// ---------------------------------------------------------------------------
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// SetData
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::SetData( int aIndex, std::auto_ptr<MulVisualItem> aVisualItem, 
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                          const MulDataPath& aPath)
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    {
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    __MUL_ASSERT( aIndex >= 0 && aIndex < mCacheManager->ExpandedNodeCount(),_L("Invalid Argument"));
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    MulVisualItem* visualItem = mCacheManager->Data( aIndex );
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    MUL_LOG_INFO2("MUL::MulPushMode::SetData() Index:%d,item:%x",aIndex, visualItem);
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    if( visualItem )
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        {
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        mCacheManager->UpdateVisualItem( *aVisualItem , aPath, aIndex );
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        }
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    else
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        {
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        // Validating input visual item
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        ValidateVisualItem( *aVisualItem );
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        mCacheManager->AddVisualItem( aVisualItem, aPath, aIndex );
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        }
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    }
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// ---------------------------------------------------------------------------
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// Count
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// ---------------------------------------------------------------------------
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//
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int MulPushMode::Count(const MulDataPath& /*aPath*/) const
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	{
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	return mCacheManager->ExpandedNodeCount();
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	} 
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// ---------------------------------------------------------------------------
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// SetTemplate
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::SetTemplate( int aItemIndex, mulwidget::TLogicalTemplate aTemplateId, 
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	                    	  const MulDataPath& /*aPath*/ )
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	{	
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	MUL_LOG_ENTRY_EXIT("MUL::MulPushMode::SetTemplate");
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    MulVisualItem* visualItem = mCacheManager->Data( aItemIndex );	
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    if( visualItem )
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        {
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        mulwidget::TLogicalTemplate logicalTemplate = (mulwidget::TLogicalTemplate) visualItem->AttributeAsInt( mulvisualitem::KAttributeTemplate );
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    	//if template is not same then only change it		
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        if( logicalTemplate != aTemplateId  )
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        	{
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        	visualItem->SetAttribute( mulvisualitem::KAttributeTemplate, aTemplateId );   		
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        	}
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        }
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	}
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// ---------------------------------------------------------------------------
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// CurrentItemCount
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// ---------------------------------------------------------------------------
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//  
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int MulPushMode::CurrentItemCount() const
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	{
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	return mCacheManager->ExpandedNodeCount();		
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	}
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// ---------------------------------------------------------------------------
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// CacheManager
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// ---------------------------------------------------------------------------
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//
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MulCacheManager& MulPushMode::CacheManager() const
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	{
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	return *mCacheManager;
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	}
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// ---------------------------------------------------------------------------
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//ValidateVisualItem
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::ValidateVisualItem( MulVisualItem& aVisualItem )
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	{
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	//add default template to item if template is not already set and default template is not null
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	IMulVariantType* itemTemplate = aVisualItem.Attribute( mulvisualitem::KAttributeTemplate );
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	if( !itemTemplate )
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		{
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		if( mDefaultTemplate != mulwidget::KTemplateUnknown )
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			{
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			//add default template to this visual item	
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			aVisualItem.SetAttribute( mulvisualitem::KAttributeTemplate, mDefaultTemplate, 0 );
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			}
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		else
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			{
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			//template must be there
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			throw std::invalid_argument("Default template not available.");
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			}
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		}
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	}
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// ---------------------------------------------------------------------------
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// ModelCountChanged
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// ---------------------------------------------------------------------------
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//
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void MulPushMode::ModelCountChanged(int aOldCount, int aNewCount)
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	{
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	MUL_LOG_ENTRY_EXIT("MUL::MulPushMode::ModelCountChanged()");
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	MUL_LOG_INFO2("MUL::MulPushMode::ModelCountChanged() aOldCount:%d,aNewCount:%d", aOldCount, aNewCount );
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	mDataWindow.AdjustOffset();	
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	}
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// ---------------------------------------------------------------------------
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// ValidateCurrentHighlight
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// ---------------------------------------------------------------------------
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//
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bool MulPushMode::ValidateCurrentHighlight()
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	{
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	// To inform the calling class whether the highlight has changed
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	int modelCount = mCacheManager->ExpandedNodeCount();
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	if( mDataWindow.Highlight() >= modelCount)
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		{
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		mDataWindow.UpdateHighlight( modelCount-1 );
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		return true;
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		}
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	return false;
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	}
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// ---------------------------------------------------------------------------
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// Item
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// ---------------------------------------------------------------------------
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//
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const MulVisualItem& MulPushMode::Item( int aAbsoluteIndex )
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    {
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    MulVisualItem* visualItem = mCacheManager->Data( aAbsoluteIndex );
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    if(!visualItem)
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        {
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        throw std::invalid_argument(KInvalidArgument);  
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        }
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    return *visualItem; 
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    }
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	} // namespace ends here
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//End of file
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