widgetmodel/alfwidgetmodel/inc/alfwidgetattributeownerimpl.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:  Implementation of the IAlfAttributeOwner interface 
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*                for AlfWidget.
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*
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*/
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#ifndef __ALFELEMENTATTRIBUTEOWNERIMPL_H__
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#define __ALFELEMENTATTRIBUTEOWNERIMPL_H__
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#include "alf/ialfattributeowner.h"
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#include <osn/alfptrvector.h>
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namespace Alf
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    {
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class CAlfWidgetControl;   
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/**
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 * Implementation of the IAlfAttributeOwner interface for AlfWidget.
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 */    
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class AlfWidgetAttributeOwnerImpl : public IAlfAttributeOwner
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    {
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public:
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    /**
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     * Constructor.
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     *
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     * @param aWidget Reference to owner widget.
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     */
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    AlfWidgetAttributeOwnerImpl(CAlfWidgetControl* aControl);
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    /**
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     * Destructor.
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     */
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    virtual ~AlfWidgetAttributeOwnerImpl();
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// from base class IAlfInterfaceBase
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    /**
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     * Getter for interfaces provided by the widget classes.
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     * Derived classes should always call the base class method
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     * from the overridden MakeInterface.
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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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    virtual IAlfInterfaceBase* makeInterface(const IfId& aType);       
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// from base class IAlfAttributeOwner
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	/**
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     * Get the number of available attributes.
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     *
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     * @return The number of attributes.
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     */
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    virtual int attributeCount() const;
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    /**
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     * Gets the attribute with the given name.
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     * The returned attribute instance is owned by the widget and
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     * should not be deleted.
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     * Also the returned attribute instance should not be modified.
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     * Use SetAttribute for that.
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     *
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     * @param aAttribName The name of the attribute.
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     * @return The attribute, or 0 if the attribute was not found.
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     */
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    virtual const AlfAttribute* getAttribute(const UString& aAttribName) const;
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    /**
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     * Set a value of an attribute.
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     *
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     * @param aAttribute Reference attribute, the data is copied from it.
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     * The ownership is not transferred.
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     * @return True if the attribute was supported, false if not.
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     */
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    virtual bool setAttribute(const AlfAttribute& aAttribute); 
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    /**
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     * Set a value of an attribute.
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     * This SetAttribute variant is for simple non animated attributes 
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     * that only have name and value.
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     *
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     * @param aAttribName Name of the attribute.
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     * @param aValue Value of the attribute. Ownership is transferred
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     * @return True if the attribute was supported, false if not.
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     */    
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    virtual bool setAttribute(const UString& aAttribName, 
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        AlfAttributeValueType* aValue);         
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    /**
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     * Sets a value of an attribute to a specific target. 
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     * The target is identified by using aTargetId parameter.
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     *
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     * @param aTargetId  Name of the target widget part, e.g element class tag.
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     * @param aAttribute Reference attribute, the data is copied from it.
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     *                   The ownership is not transferred.
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     * @return True if the attribute was supported, false if not.
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     */    
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    virtual bool setAttribute( const UString& aTargetId , 
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                               AlfAttribute& aAttribute ); 
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   /**
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     * Sets values of each attribute in given container to a specific target. 
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     * The target is identified by using aTargetId parameter.
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     *
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     * @param aTargetId  Name of the target widget part, e.g element class tag.
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     * @param aAttributeContainer Reference attributeContainer, All attributes
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     *        in the container are handled. The ownership is not transferred.
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     * @return True if some attributes were supported, false if not.
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     */    
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    virtual bool setAttributeContainer( const UString& aTargetId , 
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                               AlfAttributeContainer& aAttributeContainer ); 
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  /**
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     * Sets a value of an static attribute.
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     * This SetAttribute variant is for simple non animated attributes 
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     * that only have name and value.
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     *
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     * @param aTargetId   The name of the target widget part, e.g. element class
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     * @param aAttribName Name of the attribute.
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     * @param aValue      Value of the attribute. Ownership is transferred
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     * @return True if the attribute was supported, false if not.
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     */
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    virtual bool setAttribute( const UString& aTargetId, 
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                               const UString& aAttribName, 
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                               AlfAttributeValueType* aValue );
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       /**
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     * Sets values of each attribute in given container
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     *
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     * @param aAttributeContainer Reference attributeContainer, All attributes
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     *        in the container are handled. The ownership is not transferred.
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     *                            
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     * @return True if some attributes were supported, false if not.
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     */    
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    virtual bool setAttributeContainer( AlfAttributeContainer& aAttributeContainer ); 
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 		/**
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     * Gets the attribute with the given name from specific target.
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     * The returned attribute instance is owned by the widget and
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     * should not be deleted.
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     * Also the returned attribute instance should not be modified.
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     * Use SetAttribute for that.
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     *
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     * @param aTargetId   The name of the target widget part, e.g. element class
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     * @param aAttribName The name of the attribute.
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     * @return A pointer to the attribute, or 0 if the attribute was not found.
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     */
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    virtual const AlfAttribute* getAttribute( const UString& aTargetId ,
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                                              const UString& aAttribName ) const;
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private:
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    /**
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     * Lets elements to try handle attribute.
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     *
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     * @param aAttribute Reference attribute, the data is copied from it.
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     * The ownership is not transferred.
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     * @return True if the attribute was supported, false if not.
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     */
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    bool handleElementAttribute(const AlfAttribute& aAttribute);
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    /**
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     * Handles the attribute, sets proper values.
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     *
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     * @param aAttribute Reference attribute, the data is copied from it.
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     * The ownership is not transferred.
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     */
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    void handleAttribute(const AlfAttribute& aAttribute);      
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    /**
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     * Can attribute be handled with this widget.
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     *
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     * @param aAttributeName Name of the attribute.
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     * @return True if attribute is supported, false elsewhere.
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     */
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    bool canHandleAttribute(const char* aAttributeName);
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private:
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    /**
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     * The control. Not own.
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     */
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    CAlfWidgetControl* mControl;
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    /*
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     * Array of attributes set through IAlfAttributeOwner interface. Own.
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     */
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    AlfPtrVector<AlfAttribute> mAttributeList;        
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    };
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    }   // namespace Alf
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#endif // __ALFELEMENTATTRIBUTEOWNERIMPL_H__