--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widgetmodel/alfwidgetmodel/src/alfgridlayoutmanagerimpl.cpp	Thu Dec 17 08:56:02 2009 +0200
@@ -0,0 +1,193 @@
+/*
+* Copyright (c) 2007 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:  layoutmanager implementation class with focus handling in 1D (next/previous)
+*
+*/
+
+
+#include <alf/ialfwidgetcontrol.h>
+#include <alf/alfvisual.h>
+#include <alf/alfgridlayout.h>
+#include "alf/alfwidget.h"
+#include <alf/alfvisualfactory.h>
+#include <alf/alfexceptions.h>
+#include <alf/ialflayoutpreferences.h>
+#include <osn/osnnew.h>
+
+//stl
+#include <algorithm> //for min & max
+
+#include "alfgridlayoutmanagerimpl.h"
+
+using namespace Alf;
+
+namespace Alf
+    {
+// ======== MEMBER FUNCTIONS ========
+    
+// ---------------------------------------------------------------------------
+// layoutmanagerimpl constructor
+// ---------------------------------------------------------------------------
+//    
+AlfGridLayoutManagerImpl::AlfGridLayoutManagerImpl(
+    AlfGridLayoutManager& aGridLayoutManager) : 
+    mGridLayoutManager(aGridLayoutManager)
+    {
+    }
+    
+// ---------------------------------------------------------------------------
+// creates the layout used by the layoutmanager.
+// ---------------------------------------------------------------------------
+//    
+AlfGridLayoutManagerImpl::~AlfGridLayoutManagerImpl()
+    {
+    }
+
+// ---------------------------------------------------------------------------
+// from IAlfLayoutPreferences
+// Returns the minimum area that this layout manager can occupy by observing
+// the minimum sizes of the child UI elements in the layout
+// ---------------------------------------------------------------------------
+//
+bool AlfGridLayoutManagerImpl::getMinimumSize( TAlfXYMetric& /*aMinSize*/ ) const
+	{
+	return false;
+	}
+
+// ---------------------------------------------------------------------------
+// from IAlfLayoutPreferences
+// Returns the maximum area that this layout manager can occupy by observing
+// the maximum sizes of the child UI elements in the layout
+// ---------------------------------------------------------------------------
+//
+bool AlfGridLayoutManagerImpl::getMaximumSize( TAlfXYMetric& /*aMaxSize*/ ) const
+	{
+	return false;
+	}
+
+// ---------------------------------------------------------------------------
+// Combines and returns the preferred sizes of all child UI elements according
+// to the layouting rules.
+// ---------------------------------------------------------------------------
+//
+bool AlfGridLayoutManagerImpl::getPreferredSize(TAlfXYMetric& aPreferredSize) const
+	{	
+	bool hasPreferredSize = false;
+	TAlfXYMetric resultSize = TAlfXYMetric(TAlfMetric(0), TAlfMetric(0));
+		
+    const CAlfGridLayout& gridlayout = layout();
+    const int childCount = mGridLayoutManager.count();
+    const int gridColCount = gridlayout.ColumnCount();
+    
+    //iterate the columns to calculate the preferred width.
+    const int colCount = std::min<int>(gridColCount, childCount);
+    for (int i = 0; i < colCount; i++)
+        {
+        CAlfWidgetControl* childWidgetControl = mGridLayoutManager.getControl(i);
+        //getControl may return null, but getLayoutPreferences checks that.
+        const IAlfLayoutPreferences* layoutPrefs = 
+            mGridLayoutManager.getLayoutPreferences(childWidgetControl);        
+        
+        if (layoutPrefs)
+            {
+            TAlfXYMetric prefSize;
+            if (layoutPrefs->getPreferredSize(prefSize))
+                {
+                if(prefSize.iX.iUnit == EAlfUnitPixel)
+                    {
+                    resultSize.iX.iMagnitude += prefSize.iX.iMagnitude;
+                    hasPreferredSize = true;
+                    }
+                }
+            }
+        }
+    
+    //iterate the rows to calculate the preferred height  
+    if (hasPreferredSize)
+        {
+        //count rows, that have at least one visual.
+        int usedRows = childCount / gridColCount;
+        if (childCount % gridColCount)
+            {
+            //last wor not filled completely, but still valid to get preferred height
+            //for this row also.
+            usedRows++;
+            }
+            
+        const int rowCount = std::min<int>(gridlayout.RowCount(), usedRows);
+        for (int i = 0; i < rowCount; i+= gridColCount)
+            {
+            CAlfWidgetControl* childWidgetControl = mGridLayoutManager.getControl(i);
+            //getControl may return null, but getLayoutPreferences checks that.
+            const IAlfLayoutPreferences* layoutPrefs = 
+                mGridLayoutManager.getLayoutPreferences(childWidgetControl);        
+            
+            if (layoutPrefs)
+                {
+                TAlfXYMetric prefSize;
+                if (layoutPrefs->getPreferredSize(prefSize))
+                    {
+                    if(prefSize.iY.iUnit == EAlfUnitPixel)
+                        {
+                        resultSize.iY.iMagnitude += prefSize.iY.iMagnitude;
+                        hasPreferredSize = true;
+                        }
+                    }
+                }
+            }
+        }
+        
+    aPreferredSize = resultSize;
+    return hasPreferredSize;
+	}
+ 
+// ---------------------------------------------------------------------------
+// from IAlfLayoutPreferences
+// At the moment doesn't do anything since preferred size is being queried
+// from the child UI elements added to this layout manager.
+// ---------------------------------------------------------------------------
+//
+void AlfGridLayoutManagerImpl::setPreferredSize( const TAlfXYMetric& aPreferredSize)
+	{
+	TAlfTimedPoint size((float)aPreferredSize.iX.iMagnitude,(float)aPreferredSize.iY.iMagnitude);
+	layout().SetSize(size);
+	mGridLayoutManager.owner().updateParentLayout();
+	}
+
+// ---------------------------------------------------------------------------
+// From class IAlfInterfaceBase.
+// Getter for interfaces provided by the element.
+// ---------------------------------------------------------------------------
+//
+IAlfInterfaceBase* AlfGridLayoutManagerImpl::makeInterface(const IfId& aType)
+    {
+    UString param(aType.mImplementationId);
+    if (param == IAlfLayoutPreferences::type().mImplementationId)
+        {
+        return this;
+        }      
+    
+    return NULL;
+    }
+    
+// ---------------------------------------------------------------------------
+// returns the gridlayout used by the layoutmanager
+// ---------------------------------------------------------------------------
+//
+CAlfGridLayout& AlfGridLayoutManagerImpl::layout() const
+    {
+    return dynamic_cast<CAlfGridLayout&>(mGridLayoutManager.getLayout());
+    }
+
+ } // Alf