imageeditor/inc/SingleParamControlObserver.h
author qifeima <>
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/*
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* Copyright (c) 2010 Ixonos Plc.
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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 the "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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* Ixonos Plc
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*
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* Description:  
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*
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*/
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#ifndef SINGLEPARAMCONTROLOBSERVER_H
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#define SINGLEPARAMCONTROLOBSERVER_H
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//  INCLUDES
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//  FORWARD DECLARATIONS
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/*	CLASS: MSingleParControlObserver
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*
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*   MSingleParControlObserver is a mixin class for updating the parameter
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*
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*/
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class MSingleParControlObserver
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{
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public:
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/** @name Methods:*/
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//@{
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    enum TParamOperation
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    {
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        //  Invalid
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        EParamOperationMin,
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        //  Set default parameter
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        EParamOperationDefault,
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        //  Add step to parameter
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        EParamOperationAdd,
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        //  Subtract step from parameter
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        EParamOperationSubtract,
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        //  Invalid
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        EParamOperationMax,
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    };
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//@}
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/** @name Methods:*/
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//@{
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	/** ParamOperation 
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    *
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    *   Performs an operation to the filter parameter.
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	*
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	*	@param aOperation - filter parameter operation
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	*	@return -
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	*/
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	virtual void ParamOperation (const TParamOperation aOperation) = 0;
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	/** GetParam
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    *
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    *   Gets filter parameter.
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	*
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	*	@param -
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	*	@return TReal - filter parameter value
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	*/
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	virtual TReal GetParam () const = 0;
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//@}
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protected:
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/** @name Methods:*/
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//@{
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//@}
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/** @name Members:*/
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//@{
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//@}
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private:
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/** @name Methods:*/
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//@{
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//@}
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/** @name Members:*/
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//@{
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//@}
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};
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#endif
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// End of File