widgetmodel/alfwidgetmodel/src/alfwidgetenvextension.cpp
author Simon Howkins <simonh@symbian.org>
Tue, 16 Nov 2010 11:09:56 +0000
branchRCL_3
changeset 33 2d34f54f7334
parent 0 e83bab7cf002
permissions -rw-r--r--
Fixed path to IBY files to be exported
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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:  Extensions can be added to AlfEnv through this class.
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               Currently resourcepool,widgetfactory can be added as extensions to AlfEnv.
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*
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*/
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#include <alf/alfenv.h>
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#include <alf/alfenvobject.h>
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#include <alf/alfresourcepool.h>
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#include <osn/osnnew.h>
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#include <alf/alfwidgetexception.h>
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#include <alf/alfwidgetenvextension.h>
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#include <alf/alfwidgetfactoryloader.h>
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#include <alf/ialfwidgetfactory.h>
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namespace Alf
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    {
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    const int KAlfExtensionResourcePoolUid( 89 ); // Bogus id for resource 
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                                                  // pool extension
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    const int KAlfExtensionWidgetFactoryUid( 106 ); // Bogus id for widget
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                                                    // factory extension
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    // Env extension for the resource pool
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    class AlfExtensionResourcePoolContainer : public MAlfEnvObject
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        {
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    public:        
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        AlfExtensionResourcePoolContainer( ResourcePool* aResourcePool) :
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        mResourcePool(aResourcePool )
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            {
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            }
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        virtual void Release()
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            {
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            delete this;
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            }
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        ~AlfExtensionResourcePoolContainer()
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            {
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            delete mResourcePool;
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            }
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        // Owned
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        ResourcePool* mResourcePool;
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        };
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    // Env extension for the widget factory
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    class AlfExtensionWidgetFactory : public MAlfEnvObject
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        {
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    public:        
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        AlfExtensionWidgetFactory( 
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            AlfWidgetFactoryLoader* amWidgetFactoryLoader,
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            IAlfWidgetFactory* aWidgetFactory) :
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        mWidgetFactoryLoader( amWidgetFactoryLoader ),
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        mWidgetFactory( aWidgetFactory )
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            {
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            }
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        virtual void Release()
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            {
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            delete this;
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            }
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        ~AlfExtensionWidgetFactory()
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            {
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            delete mWidgetFactoryLoader;
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            }
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        // Owned
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        AlfWidgetFactoryLoader* mWidgetFactoryLoader;
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        // Not owned
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        IAlfWidgetFactory* mWidgetFactory;
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        };    
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// ---------------------------------------------------------------------------
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// Initializes environment with resource pool and factory extensions
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// ---------------------------------------------------------------------------
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//    
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OSN_EXPORT void AlfWidgetEnvExtension::initializeEnvironment(CAlfEnv& aEnv)
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    {
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	AlfExtensionResourcePoolContainer* poolContainer = 
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        static_cast<AlfExtensionResourcePoolContainer*>(
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            aEnv.Extension( KAlfExtensionResourcePoolUid));
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    if ( poolContainer == NULL)
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        {
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        // Initialize the env with resource pool extension
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        initializeEnvironmentForResourcePool(aEnv);
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        }
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	AlfExtensionWidgetFactory* widgetFactoryExtension = 
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        static_cast<AlfExtensionWidgetFactory*>(
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            aEnv.Extension( KAlfExtensionWidgetFactoryUid));
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    if ( widgetFactoryExtension == NULL)
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        {
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        // Initialize the env with widget factory extension
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        initializeEnvironmentForFactory(aEnv);
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        }
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    }
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// ---------------------------------------------------------------------------
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// Initializes environment with Theme Manager extension
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// ---------------------------------------------------------------------------
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//   
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void AlfWidgetEnvExtension::initializeEnvironmentForTheme(CAlfEnv& /*aEnv*/ )
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    {
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    }
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// ---------------------------------------------------------------------------
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// Initializes environment with resource pool extension
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// ---------------------------------------------------------------------------
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//        
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void AlfWidgetEnvExtension::initializeEnvironmentForResourcePool(CAlfEnv& aEnv)
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    {
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    auto_ptr<ResourcePool> pool(new(EMM) ResourcePool(
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                                             aEnv.TextureManager(), NULL));
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    auto_ptr<AlfExtensionResourcePoolContainer> poolContainer(
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        new(EMM) AlfExtensionResourcePoolContainer( pool.release()));
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    int err = aEnv.AddExtension( KAlfExtensionResourcePoolUid,
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                       (MAlfEnvObject*)(poolContainer.get()));
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    if ( err != KErrNone)
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        {
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        ALF_THROW(AlfWidgetException, ECommonError, "Failed to add AlfEnv extension");
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        }
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    else
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        {
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        poolContainer.release();
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        }   
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    }
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// ---------------------------------------------------------------------------
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// Returns the reference for Resource Pool extension object. 
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// ---------------------------------------------------------------------------
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//
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OSN_EXPORT ResourcePool& AlfWidgetEnvExtension::resourcePool( CAlfEnv& aEnv)
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    {
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    Alf::AlfExtensionResourcePoolContainer* poolContainer = 
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        static_cast<Alf::AlfExtensionResourcePoolContainer*>(aEnv.Extension( KAlfExtensionResourcePoolUid));
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    if ( poolContainer == NULL)
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        {
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        initializeEnvironment(aEnv);
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        }
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    //re-fetch the pool
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    poolContainer = 
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        static_cast<Alf::AlfExtensionResourcePoolContainer*>(aEnv.Extension( KAlfExtensionResourcePoolUid));
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    return *(poolContainer->mResourcePool);
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}
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// ---------------------------------------------------------------------------
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// Initializes environment with factory extension
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// ---------------------------------------------------------------------------
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//    
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void AlfWidgetEnvExtension::initializeEnvironmentForFactory(CAlfEnv& aEnv)
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    {
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    auto_ptr<AlfWidgetFactoryLoader> widgetFactoryLoader( 
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                                         new (EMM) AlfWidgetFactoryLoader() );
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    IAlfWidgetFactory* widgetFactory = NULL;
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    widgetFactory = widgetFactoryLoader->loadWidgetFactory(aEnv);
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    if(!widgetFactory)
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        {
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        ALF_THROW(AlfWidgetException, ECommonError, "Failed to create widget factory");
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        }
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    auto_ptr<AlfExtensionWidgetFactory> widgetFactoryExtension(
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        new(EMM) AlfExtensionWidgetFactory( widgetFactoryLoader.release(),
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                     widgetFactory));
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    int err = aEnv.AddExtension( KAlfExtensionWidgetFactoryUid,
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                       (MAlfEnvObject*)(widgetFactoryExtension.get()));
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    if ( err != 0)
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        {
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        ALF_THROW(AlfWidgetException, ECommonError, "Failed to add AlfEnv extension");
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        }
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    else
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        {
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    	widgetFactoryExtension.release();
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        }        
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    }
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// ---------------------------------------------------------------------------
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// Returns the reference for Theme Manager extension object. 
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// ---------------------------------------------------------------------------
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//    
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OSN_EXPORT AlfThemeManagerUtil& AlfWidgetEnvExtension::themeManagerUtil( CAlfEnv& /*aEnv*/)
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    {
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    // Depricated
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    ALF_THROW(AlfWidgetException, EInvalidArgument, "Depricated Module");
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    }
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// ---------------------------------------------------------------------------
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//Access to the widget factory
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// ---------------------------------------------------------------------------
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//        
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OSN_EXPORT IAlfWidgetFactory& AlfWidgetEnvExtension::widgetFactory( 
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    CAlfEnv& aEnv)
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    {
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    AlfExtensionWidgetFactory* widgetFactoryExtension = 
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        static_cast<AlfExtensionWidgetFactory*>(
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            aEnv.Extension( KAlfExtensionWidgetFactoryUid));
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    if ( widgetFactoryExtension == NULL)
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        {
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        initializeEnvironmentForFactory(aEnv);
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        }
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    //re-fetch the widget factory extension
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    widgetFactoryExtension = 
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        static_cast<AlfExtensionWidgetFactory*>(
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            aEnv.Extension( KAlfExtensionWidgetFactoryUid));
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    return *(widgetFactoryExtension->mWidgetFactory);
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    }    
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    } // Alf