<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"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: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept xml:lang="en" id="GUID-EB82A2C8-EF92-5276-B503-687DEBF82EA4"><title>Creating an Animation Object</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>In order to create new instances of animation objects of type <xref href="GUID-029C644B-BE0F-37C6-95E2-D27F974E6AD3.dita"><apiname>CAnim</apiname></xref> in the DLL, you need to implement the <codeph>CAnimDll::CreateInstanceL()</codeph> pure virtual factory function in the derived class. </p> <p>Declare your <xref href="GUID-9E598CDA-6483-3AE3-ABFF-0F701A47AB84.dita"><apiname>CAnimDll</apiname></xref> derived class in a header file as follows: </p> <codeblock id="GUID-6F7DE31B-0CCB-59D3-82BA-3D1AB6AE571F" xml:space="preserve">class CExampleAnimDll : public CAnimDll

    {

public:

    virtual CAnim* CreateInstanceL(TInt aType);

    };</codeblock> <p>A convenient way to implement <codeph>CreateInstanceL()</codeph> is to switch on the <codeph>TInt aType</codeph> argument, with each switch constructing a different <codeph>CAnim</codeph> derived animation class identified by an <codeph>aType</codeph> enum. For example. if <codeph>CShapesAnims</codeph> is one of those classes: </p> <codeblock id="GUID-BDFD1962-5845-5605-9915-C6E1A40EDAC4" xml:space="preserve">switch(aType)

    {

    // cases

    case EShapesAnims:

        return new(ELeave) CShapesAnims;

    ...

    default:

        iFunctions -> Panic();

        return NULL; // dummy return to prevent compiler error