inc/alf/alfelement.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2007 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:  The interface and the basic implementation for presentation elements.
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*
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*/
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#ifndef ALFELEMENT_H
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#define ALFELEMENT_H
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#include <osn/osndefines.h>
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#include <memory>
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#include <alf/ialfelement.h>
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#include <osn/alfptrvector.h>
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using osncore::AlfPtrVector;
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using std::auto_ptr;
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class CAlfVisual;
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class CAlfLayout;
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namespace Alf
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    {
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class CAlfWidgetControl;
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class IAlfVariantType;
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class AlfReferenceToVisual;
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class IAlfVisualTemplate;
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class AlfElementImpl;
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class IfId;
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/** @class AlfElement alfelement.h "alf/alfelement.h"
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 *  The implementation of a generic element. Elements can be used,
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 *  e.g., from declaration, to describe a specific part of
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 *  the presentation of a component. The presentation may
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 *  be predefined, or it may depend on the component data.
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 *
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 *  @lib alfwidgetmodel.lib
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 *  @since S60 ?S60_version
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 *  @status Draft
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 *  @interfaces IAlfAttributeOwner, IAlfElement
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 *	@attributes duiuimodel::tactileattributes::KEventInput\n
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 *				duiuimodel::tactileattributes::KFeedbackType\n
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 *				duiuimodel::commonvisualattributes::KOpacity\n
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 *				duiuimodel::layoutattributes::KPositionX\n
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 *				duiuimodel::layoutattributes::KPositionY\n
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 *				duiuimodel::layoutattributes::KWidth\n
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 *				duiuimodel::layoutattributes::KHeight\n
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 *				duiuimodel::layoutattributes::KMaxWidth\n
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 *				duiuimodel::layoutattributes::KMaxHeight\n
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 *				duiuimodel::layoutattributes::KMinWidth\n
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 *				duiuimodel::layoutattributes::KMinHeight
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 */
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class AlfElement : public IAlfElement
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    {
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public:
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    /**
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     * Static cnstructor. The new element is left on the cleanup stack.
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     *
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     * @since S60 ?S60_version
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     * @param aControl  The owner control.
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     * @param aName     The name of the element.
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     * @return New object. Should be added to the control.
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     */
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    OSN_IMPORT AlfElement(CAlfWidgetControl& aControl, const char* aName);
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    /**
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     * Destructor.
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     */
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    OSN_IMPORT virtual ~AlfElement();
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    /**
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     * Returns name of element set via Constructor.
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     *
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     * @since S60 ?S60_version
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     * @return name of element.
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     */
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    OSN_IMPORT const char* name() const;
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    /**
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     * Creates a visual tree in given element.
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     *
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     * @since S60 ?S60_version
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     * @param aElement Element for which visual tree will be created
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     * @param aChildData Data for visual tree to be created
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     * @param aData Data for parent visual tree
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     * @param aIndex Position in parent layout at which new visual tree will be added
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     * @param aDataID Parent visual tree's data id
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     */
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    OSN_IMPORT virtual void createChildVisualTree( IAlfElement* aElement,
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                                                  IAlfVariantType& aChildData,
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                                                  IAlfBranch& aData,
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                                                  int aIndex, uint aDataID );
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    /**
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     * Creates a visual tree with the data given for visuals.
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     *
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     * @exception osncore::AlfElementException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when creation of visual tree fails.
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     * @since S60 ?S60_version
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     * @param aChildData Data for visual tree to be created
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     * @param aParentData Data for parent visual tree
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     * @param aIndex Position in parent layout at which new visual tree will be added
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     * @param aParentDataID Parent visual tree's data id
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     * @param aParentLayout Parent layout to which newly created visual tree will be added
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     * @param aLayoutIndex Position in parent layout at which new visual tree will be added
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     */
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    OSN_IMPORT virtual CAlfVisual* createVisualTree(
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        IAlfVariantType& aChildData, IAlfBranch& aParentData, int aIndex,
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        uint aParentDataID, CAlfLayout* aParentLayout, int aLayoutIndex );
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    /**
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     * Creates a visual tree with the data given for visuals.
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     *
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     * @exception std::bad_alloc 
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::ECanNotCreateVisual\n 
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     *										  when creation of visual fails.
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when wrond data id is supplied.
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	 * @exception std::bad_alloc     
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     * @since S60 ?S60_version
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     * @param aData Data for visual tree to be created
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     * @param aDataID Parent visual tree's data id
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     * @param aParentLayout Parent layout to which newly created visual tree will be added
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     * @param aLayoutIndex Position in parent layout at which new visual tree will be added
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     */
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    OSN_IMPORT virtual CAlfVisual* createVisualTree(
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        IAlfVariantType& aData, uint aDataID,
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        CAlfLayout* aParentLayout, int aLayoutIndex );
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    /**
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     * Removes visual tree from given element.
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     *
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     * @since S60 ?S60_version
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     * @param aElement Element from which visual tree is to be removed
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     * @param aData
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     * @param aIndex 
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     * @param aDataID 
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     */
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    OSN_IMPORT virtual void removeChildVisualTree( IAlfElement* aElement,
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                                                  IAlfBranch& aData,
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                                                  int aIndex, uint aDataID );
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    /**
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     * Removes visual tree.
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     *
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when removal of visual tree fails.
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     * @since S60 ?S60_version
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     * @param aParentData
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     * @param aIndex 
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     * @param aParentDataID 
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     */
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    OSN_IMPORT virtual void removeVisualTree( IAlfBranch& aParentData,
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                                             int aIndex, uint aParentDataID );
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    /**
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     * Removes visual tree.
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     *
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when removal of visual tree fails.
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     * @since S60 ?S60_version
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     * @param aData
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     * @param aDataID 
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     */
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    OSN_IMPORT virtual void removeVisualTree( IAlfVariantType& aData,
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                                             uint aDataID );
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    /**
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     * Updates the visual tree.
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     *
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when a visual can not be created.
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     * @since S60 ?S60_version
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     * @param aNewData
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     * @param aOldData 
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     * @param aDataID 
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     */
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    OSN_IMPORT virtual void updateVisualTree( IAlfVariantType& aNewData,
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                                                  IAlfVariantType& aOldData,
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                                             uint aDataID );
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    /**
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     * Replaces the visual tree.
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     *
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when old data id is wrong.
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     * @since S60 ?S60_version
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     * @param aData
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     * @param aDataID 
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     * @param aOldDataID 
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     */
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    OSN_IMPORT void replaceVisualTree( IAlfVariantType& aData, 
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                                       uint aDataID, uint aOldDataID );
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    /**
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     * Add a new visual tree to the element.
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     * Used by derived classes.
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     *
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidElement\n 
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     *										  when either the visual is NULL or data id is wrong.
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     * @exception std::bad_alloc 
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     * @since S60 ?S60_version
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     * @param aVisualTree visual to be appended.
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     * @param aDataID   data id of the visual.
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     */
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    OSN_IMPORT void addVisualTree(CAlfVisual* aVisualTree, uint aDataID);
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    /**
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     * Updates the Data ids in an the element.
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     *
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     * @since S60 ?S60_version
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     * @param aParentBranch Data in which IDs to be updated
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     * @param aStartIndex Index from which IDs to be updated
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     * @param aOffset Amount by which IDs are increased/decreased
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     * @param aOldParentDataId Not used.
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     * @param aParentDataID Parent data id of the element
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     */
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    OSN_IMPORT void updateDataIDs( IAlfBranch& aParentBranch, int aStartIndex,
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                                 int aOffset, uint aOldParentDataId, uint aParentDataID );
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    /**
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     * Returns the default parent layout of visual tree in an element.
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     *
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     * @exception osncore::AlfVisualException Thrown with the error code osncore::EInvalidVisual\n 
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     *										  when wrong data id is supplied.
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     * @since S60 ?S60_version
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     * @param aParentDataIS
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     * @return Parent layout
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     */
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    OSN_IMPORT CAlfLayout* defaultParentLayout(uint aParentDataID);
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    /**
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     * Set reference to the default parent layout.
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     *
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     * @since S60 ?S60_version
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     * @param aReference The reference to the default parent layout.
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     */
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    OSN_IMPORT void setDefaultParentLayout(AlfReferenceToVisual* aReference);
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    /**
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     * Finds visual with the given name and id in visual tree of element.
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     *
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     * @since S60 ?S60_version
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     * @param aName Name of the visual
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     * @param aDataID Data id of the visual
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     * @return Visual.Returns NULL if no matching visual is found.
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     */
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    OSN_IMPORT CAlfVisual* findVisual(const char* aName, uint aDataID);
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    /**
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     * Get visual from the data id.
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     *
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     * @since S60 ?S60_version
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     * @param aDataID data id of the visual.
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     */
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    OSN_IMPORT CAlfVisual* findVisual(uint aDataID);
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    /**
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     * Returns the data id of given visual.
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     *
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     * @since S60 ?S60_version
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     * @param aVisual Reference to visual whose data id is needed.
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     * @return Data id of the visual
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     */
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    OSN_IMPORT uint dataID(const CAlfVisual& aVisual) const;
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    /**
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     * Returns parent element of the element.
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     *
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     * @since S60 ?S60_version
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     * @return Parent element. NULL, if there is no parent element.
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     */
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    OSN_IMPORT const IAlfElement* parentElement() const;
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    /**
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     * Makes the element child of given element.
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     *
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     * @since S60 ?S60_version
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     * @param aParent Parent element.
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     */
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    OSN_IMPORT void setParentElement(IAlfElement& aParent);
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    /**
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     * Sets the visual template for the element. This element
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     * will acquire ownership of the visual template hierarchy
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     * under the given visual template.
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     * Call to this method cannot throw an exception.
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     *
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     * @since S60 ?S60_version
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     * @param aTemplate Root of the visual template hierarchy to be set
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     *                  into the widget element.
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     */
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    OSN_IMPORT void setVisualTemplate(IAlfVisualTemplate& aTemplate) throw();
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    /**
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     * Returns the root visual template of the visual template hierarchy
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     * owned by this element. Call to this method cannot throw an exception.
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     *
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     * @since S60 ?S60_version
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     * @param aType A descriptor to identify the type of the queried interface.
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     * @return The queried interface, or NULL if the interface is not
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     *         supported or available.
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     */
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    OSN_IMPORT IAlfVisualTemplate* getVisualTemplate() const throw();
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    /**
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     * Destroyes the visual template object assigned to this element and the whole
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     * visual template hierarchy under it.
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     *
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     * @since S60 ?S60_version
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     */
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    OSN_IMPORT void destroyVisualTemplate() throw();
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     /**
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     * Removes the visual template from this element. Returns pointer to the removed visual
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     * template object. The ownership of the visual template object is transferred to the
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     * caller. Call to this method cannot throw an exception.
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     *
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     * @since S60 ?S60_version
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     */
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    OSN_IMPORT IAlfVisualTemplate* removeVisualTemplate() throw();
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    /**
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     * Getter for the type identifier of this class.
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     *
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     * @since S60 ?S60_version
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     * @return A descriptor to identify the type of this class.
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     */
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    /**
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     * Template getter for interfaces provided by the element classes.
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     * The type of the queried interface is specified by the
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     * template parameter.
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     *
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     * @since S60 ?S60_version
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     * @param aElement The element to get the interface for.
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     * @return The queried interface, or NULL if the interface is not
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     *         supported or available.
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   352
     */
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    template <class T>
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    static T* makeInterface( AlfElement* aElement );
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   355
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// from base class IAlfInterfaceBase
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   357
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   358
    /**
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   359
     * From IAlfInterfaceBase.
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   360
     * Getter for interfaces provided by the element classes.
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   361
     * Derived classes should always call the base class method
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     * from the overridden MakeInterface.
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   363
     *
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   364
     * @since S60 ?S60_version
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   365
     * @param aType A descriptor to identify the type of the queried interface.
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   366
     * @return The queried interface, or NULL if the interface is not
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   367
     *         supported or available.
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   368
     */
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    OSN_IMPORT virtual IAlfInterfaceBase* makeInterface( const IfId& aType );
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   370
    
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   371
    /**
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     * removes and destroys all the visuals in the element.
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   373
     *
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     * @since S60 ?S60_version
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     * @param aTimeMilliseconds the animation time for remove.
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   376
     */    
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    OSN_IMPORT void removeAndDestroyVisuals( int aTimeMilliseconds );
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   378
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   379
    /**
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   380
     * from IAlfElement
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   381
     */
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   382
    OSN_IMPORT bool contains(CAlfVisual& aVisual) const;
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   383
    
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protected:
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   385
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   386
    /**
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   387
     * The protected constructor.
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   388
     *
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   389
     * @since S60 ?S60_version
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     */
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   391
    OSN_IMPORT AlfElement();
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   392
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   393
    /**
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     * The second phase constructor.
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   395
     * The element is added to the control.
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   396
     *
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   397
	 * @exception std::bad_alloc     
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   398
     * @since S60 ?S60_version
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   399
     * @param aControl  The owner control.
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   400
     * @param aName     The name of the element.
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   401
     */
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   402
    OSN_IMPORT void construct( CAlfWidgetControl& aControl, const char* aName );
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   403
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   404
    /**
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   405
     * APi to get the control containing the element.
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   406
     *
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   407
     * @since S60 ?S60_version
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   408
     */
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   409
    OSN_IMPORT CAlfWidgetControl& control();
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   410
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   411
private:
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   412
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   413
    int findFromArray( uint aDataID ) const;
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   414
    
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   415
private: // data
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   416
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   417
    auto_ptr<AlfElementImpl> mData;
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    };
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   419
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   420
#include "alf/alfelement.inl"
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   421
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    } // namespace Alf
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   423
#endif // ALFELEMENT_H