--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widgetmodel/alfwidgetmodel/inc/alfflowlayoutpreferencesimpl.h	Thu Dec 17 08:56:02 2009 +0200
@@ -0,0 +1,147 @@
+/*
+* 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:  layoutpreferences implementation class for flowlayoutmanager
+*
+*/
+
+
+#ifndef ALFFLOWLAYOUTPREFERENCESIMPL_H
+#define ALFFLOWLAYOUTPREFERENCESIMPL_H
+
+#include <osn/osndefines.h>
+#include <alf/ialflayoutpreferences.h>
+
+using namespace Alf;
+
+namespace Alf
+    {
+class AlfFlowLayoutManager;
+
+/**
+ * layout preferences implementation for flowlayoutmanager.
+ *
+ * @lib alfwidgetmodel.lib
+ * @since S60 ?S60_version
+ */
+class AlfFlowLayoutPreferencesImpl : public IAlfLayoutPreferences
+    {
+public:
+    AlfFlowLayoutPreferencesImpl(AlfFlowLayoutManager& aFlowLayoutManager);
+public:
+// from base class IAlfLayoutPreferences
+
+	/**
+	 * Returns the minimum size of the layout by combining the minimum sizes of the
+	 * layed out visuals.
+	 * 
+	 * @param aMinSize The minimum size that the object would like to be laid out to
+	 * @return false iff none of the layed out UI elements do not care about minimum size
+	 */
+	virtual bool getMinimumSize( TAlfXYMetric& aMinSize ) const;
+	
+	/**
+	 * Returns the maximum size of the layout by combining the maximum sizes of the
+	 * layed out visuals.
+	 *  
+	 * @param aMaxSize The maximum size that the object would like to be laid out to
+	 * @return false iff none of the layed out UI elements do not care about maximum size
+	 */
+	virtual bool getMaximumSize( TAlfXYMetric& aMaxSize ) const;
+	
+    /**
+     * Returns the size combined by all preferred sizes of child UI elements in this layout 
+     * when they are being layed out according to the layout manager rules.
+     * 
+     * @param aPreferredSize Filled with the referred area occupied by child elements when
+     * 						 layed out by layouting rules in this layout manager.
+     * @return False if none of the child components report their preferred size. True
+     * 		   otherwise.
+     */
+    virtual bool getPreferredSize(TAlfXYMetric& aPreferredSize) const;
+	 
+	/**
+	 * Set the preferred size into a presentation object.
+	 * 
+	 * This is not supported on the layout manager. Users should set preferred sizes of the
+	 * contained UI elements.
+	 */
+	virtual void setPreferredSize( const TAlfXYMetric& aPreferredSize );
+// from base class IAlfInterfaceBase
+    
+    /**
+     * Interface getter. 
+     * @see IAlfInterfaceBase::makeInterface
+     *
+     * @since S60 ?S60_version
+     * @param aType The type id of the queried interface.
+     * @return The queried interface, or NULL if the interface is not
+     *         supported or available.
+     */    
+    virtual IAlfInterfaceBase* makeInterface( const IfId& aType );
+protected:
+
+    /** size type to calculate @see calculateChildSizes */
+    enum sizeType
+        {
+        ESizePreferred,
+        ESizeMin,
+        ESizeMax
+        };
+        
+	/**
+	 * calculate the min-, preferred-, or max- sizes from the children. 
+	 * 
+	 * @param aSize on return, contains the calculated size.
+	 * @param aFlowDirection direction of flow.
+	 * @param aSizeType specifies, whether the min-, preferred- or max-size of the
+	 *        IAlfLayoutPreferences is used for calculation.
+	 */
+    bool calculateChildSizes(TAlfXYMetric& aSize,  
+        enum IAlfFlowLayoutPolicy::flowDirection aFlowDirection, 
+        enum sizeType aSizeType) const;
+        
+	/**
+	 * fetches the size from the IAlfLayoutPreferences-interface of the aControl.
+	 * 
+	 * @param aControl control, which preferences-interface to query.
+	 * @param aSize on return, contains the size.
+	 * @param aSizeType specifies, whether the min-, preferred- or max-size of the
+	 *        IAlfLayoutPreferences is returned.
+	 */
+    bool getSize(CAlfWidgetControl* aControl, 
+        TAlfXYMetric& aSize,
+        enum sizeType aSizeType) const;
+        
+    /**
+     * @return the flow layout policy-instance of the layoutmanager.
+     *
+     */
+    const IAlfFlowLayoutPolicy& flowLayoutPolicy() const;
+
+	/**
+	 * converts size in metrics to size in pixels. Implementation missing.
+	 * 
+	 * @param aSize size to convert
+	 * @return size in pixels.
+	 */
+    static TAlfRealSize sizeInPixels(const TAlfXYMetric& aSize);
+    
+private:
+    AlfFlowLayoutManager &mFlowLayoutManager;
+    TAlfXYMetric mPreferredSize;
+    };
+
+    } // namespace Alf
+
+#endif // ALFFLOWLAYOUTPREFERENCESIMPL_H