diff -r 000000000000 -r 4e91876724a2 photosgallery/viewframework/layouts/src/glxblendlayout.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/viewframework/layouts/src/glxblendlayout.cpp	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,265 @@
+/*
+* Copyright (c) 2008-2009 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:    Layout blender
+*
+*/
+
+
+
+
+#include "glxblendlayout.h" 
+#include <glxpanic.h> // Panic codes
+
+// LOCAL METHODS
+namespace
+	{
+	// helper method to calculate coefficiency for given field
+	TReal32 GetCoefficiency(
+		TGlxLayoutInfo& aBaseInfo, 
+		TGlxLayoutInfo& aDeltaInfo, 
+		TGlxLayoutInfo::TLayoutType aType, 
+		TInt aIndex )
+		{
+		/*
+		// position, get coefficients
+		//TReal32 new_coeff = aDeltaInfo.Coefficient( aType );
+		//TReal32 combined_coeff = aBaseInfo.Coefficient( aType );
+		// check if this is the first layout chain in the blender
+		// and full coefficiency has not been yet reached
+		if( aIndex == 0 && combined_coeff < 1.0 )
+			{
+			// increase the coefficient to reach 1.0
+			new_coeff = 1.0 - combined_coeff;
+			aBaseInfo.SetCoefficient( aType, 1.0 );
+			}
+		// if the coefficient was bigger than zero
+		// and full coefficiency has not been yet reached
+		else if( new_coeff > 0.0 && combined_coeff < 1.0 )
+			{
+			// dont allow coefficient to exceed 1.0
+			if( new_coeff > ( 1.0 - combined_coeff ) )
+				{
+				new_coeff = 1.0 - combined_coeff;
+				}
+			// increase the coefficient
+			aBaseInfo.SetCoefficient( aType, combined_coeff + new_coeff );
+			}
+		else
+			{
+			// coefficient over or underflow
+			new_coeff = 0;
+			}
+		return new_coeff;*/
+		} 
+	}
+
+// -----------------------------------------------------------------------------
+// Constructor
+// -----------------------------------------------------------------------------
+EXPORT_C TGlxBlendLayout::TGlxBlendLayout()
+	: iChanged( EFalse )	// blender not is changed by default
+	{
+	__DEBUG_ONLY( _iName = _L( "TGlxBlendLayout" ) );
+	}
+	
+// -----------------------------------------------------------------------------
+// Destructor
+// -----------------------------------------------------------------------------
+EXPORT_C TGlxBlendLayout::~TGlxBlendLayout () 
+	{
+	iLayouts.Close();
+	}
+	
+// -----------------------------------------------------------------------------
+// AddLayoutL
+// -----------------------------------------------------------------------------
+EXPORT_C void TGlxBlendLayout::AddLayoutL( MGlxLayout* aLayout )
+	{
+	// layout must not be null
+	__ASSERT_DEBUG( aLayout, Panic( EGlxPanicNullLayout ) );
+	// create layout struct
+	TLayout cache;
+	cache.iLayout = aLayout;
+	__ASSERT_DEBUG( 
+		iLayouts.Find( cache, TLayout::Match ) == KErrNotFound, 
+		Panic( EGlxPanicAlreadyAdded ) );
+
+	// cant set anything sane to layout info at this point
+	iLayouts.AppendL( cache );
+	iChanged = ETrue;
+	}
+
+// -----------------------------------------------------------------------------
+// RemoveLayout
+// -----------------------------------------------------------------------------
+EXPORT_C void TGlxBlendLayout::RemoveLayout( const MGlxLayout* aLayout )
+	{
+	TInt count = iLayouts.Count();
+	for( TInt i = 0; i < count; i++ )
+		{
+		if( iLayouts[ i ].iLayout == aLayout )
+			{
+			// Found it, remove
+			iLayouts.Remove( i );
+			iChanged = ETrue;
+			return;
+			}
+		}
+	// its ok to remove a layout that was already gone, no harm done there
+	}
+
+// -----------------------------------------------------------------------------
+// RemoveAllLayouts
+// -----------------------------------------------------------------------------
+EXPORT_C void TGlxBlendLayout::RemoveAllLayouts()
+	{
+	iLayouts.Close();
+	}
+
+// -----------------------------------------------------------------------------
+// MapValue
+// -----------------------------------------------------------------------------
+void TGlxBlendLayout::DoSetLayoutValues( TGlxLayoutInfo& aInfo )
+	{
+	/*
+	TInt count = iLayouts.Count();
+	// first set each layouts info fields correctly
+	for( TInt i = 0; i < count; i++ )
+		{
+		// reset the values for the layout info
+		//iLayouts[ i ].iLayoutInfo.Reset( aInfo.Index() );
+		//iLayouts[ i ].iLayoutInfo.SetVisual( aInfo.Visual() );
+		//iLayouts[ i ].iLayoutInfo.SetScreenInfo( aInfo.ScreenInfo() );
+		}
+
+	// process each layout
+	for( TInt i = 0; i < count; i++ )
+		{
+		// call the layout (chain) to perform the processing for their own info
+		iLayouts[ i ].iLayout->SetLayoutValues( iLayouts[ i ].iLayoutInfo );
+		}
+
+	// reset completely the aInfo fields and its coefficients
+	// we use the coefficient fields to know when we have enough values for
+	// certain field (coefficient reaches 1.0)
+	// we need to reset the base values as the cached values in layout chains
+	// had default values (which may not ne 0 for all fields)
+	aInfo.iPosition.iX = 0;
+	aInfo.iPosition.iY = 0;
+	aInfo.SetCoefficient( TGlxLayoutInfo::EPosition, 0 );
+	aInfo.iSize.iX = 0;
+	aInfo.iSize.iY = 0;
+	aInfo.SetCoefficient( TGlxLayoutInfo::ESize, 0 );
+	aInfo.iOpacity = 0;
+	aInfo.SetCoefficient( TGlxLayoutInfo::EOpacity, 0 );
+	aInfo.iRotation = 0;
+	aInfo.SetCoefficient( TGlxLayoutInfo::ERotation, 0 );
+
+	// then merge the values according to coefficients
+	// need to process in reverse order since layout in index 0
+	// has the strongest effect
+	for( TInt i = count - 1; i >= 0; i-- )
+		{
+		// position, get coefficient
+		TReal32 new_coeff = GetCoefficiency( 
+				aInfo, iLayouts[ i ].iLayoutInfo, 
+				TGlxLayoutInfo::EPosition, i );
+		// if the coefficient was bigger than zero
+		if( new_coeff > 0.0 )
+			{
+			// add new position, multiplied with the coefficient
+			aInfo.iPosition.iX += 
+				iLayouts[ i ].iLayoutInfo.iPosition.iX * new_coeff;
+			aInfo.iPosition.iY += 
+				iLayouts[ i ].iLayoutInfo.iPosition.iY * new_coeff;
+			}
+
+		// size, get coefficient
+		new_coeff = GetCoefficiency( 
+				aInfo, iLayouts[ i ].iLayoutInfo, 
+				TGlxLayoutInfo::ESize, i );
+		// if the coefficient was bigger than zero
+		if( new_coeff > 0.0 )
+			{
+			// add new size, multiplied with the coefficient
+			aInfo.iSize.iX += 
+				iLayouts[ i ].iLayoutInfo.iSize.iX * new_coeff;
+			aInfo.iSize.iY += 
+				iLayouts[ i ].iLayoutInfo.iSize.iY * new_coeff;
+			}
+
+		// opacity, get coefficient
+		new_coeff = GetCoefficiency( 
+				aInfo, iLayouts[ i ].iLayoutInfo, 
+				TGlxLayoutInfo::EOpacity, i );
+		if( new_coeff > 0.0 )
+			{
+			// add new opacity, multiplied with the coefficient
+			aInfo.iOpacity += 
+				iLayouts[ i ].iLayoutInfo.iOpacity * new_coeff;
+			}
+
+		// rotation, get coefficient
+		new_coeff = GetCoefficiency( 
+				aInfo, iLayouts[ i ].iLayoutInfo, 
+				TGlxLayoutInfo::ERotation, i );
+		if( new_coeff > 0.0 )
+			{
+			// add new rotation, multiplied with the coefficient
+			aInfo.iRotation += 
+				iLayouts[ i ].iLayoutInfo.iRotation * new_coeff;
+			}
+		} */
+	}
+
+// -----------------------------------------------------------------------------
+// DoChanged
+// -----------------------------------------------------------------------------
+TBool TGlxBlendLayout::DoChanged() const
+	{
+	// See if even one layout has changed
+	/// @todo consider adding the index of current visual to the Changed call
+/*	TInt count = iLayouts.Count();
+	for( TInt i = 0; i < count; i++ )
+		{
+		if( iLayouts[ i ].iLayout->Changed() )
+			{
+			return ETrue;
+			}
+		}
+
+	return iChanged;
+*/	}
+	
+// -----------------------------------------------------------------------------
+// DoClearChanged
+// -----------------------------------------------------------------------------
+void TGlxBlendLayout::DoClearChanged() 
+	{
+	TInt count = iLayouts.Count();
+	for( TInt i = 0; i < count; i++ )
+		{
+//		iLayouts[ i ].iLayout->ClearChanged();
+		}
+		
+	iChanged = EFalse;
+	}
+
+// -----------------------------------------------------------------------------
+// TLayout::Match
+// -----------------------------------------------------------------------------
+TBool TGlxBlendLayout::TLayout::Match( const TLayout& aLhs, const TLayout& aRhs )
+	{
+	return aLhs.iLayout == aRhs.iLayout;
+	}