vtuis/videotelui/inc/CVtUiActiveExec.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2004 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:  Asynchronous execution class for Video Telephone application.
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*
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*/
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#ifndef CVTUIACTIVEEXEC_H
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#define CVTUIACTIVEEXEC_H
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//  INCLUDES
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#include    <e32base.h>
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// FORWARD DECLARATIONS
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class CVtUiActiveExec;
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// CLASS DECLARATION
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/**
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*  Interface for asynchronous execution.
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*
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*  @since Series 60 2.6
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*/
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class MVtUiActiveExec
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    {
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    public: // New functions
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        /**
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        * Starts execution of a command.
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        * @param aActiveExec active executor.
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        * @param aState state based on which execution can be started.
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        * @param aNextState next state.
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        * @param aRequest request status, which should be used if operation is 
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        *        asynchronous.
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        * @return ETrue if operation was synchronous, otherwise EFalse.
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        */
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        virtual TBool ActiveExecExecuteL( 
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            CVtUiActiveExec& aActiveExec,
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            const TInt aState, 
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            TInt& aNextState,
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            TRequestStatus& aRequest ) = 0; 
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        /**
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        * Decide whether to continue or not.
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        * @param aActiveExec active executor.
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        * @param aState current state, should be updated to new state.
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        * @param aError error code.
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        * @return ETrue if continued, EFalse if stopped.
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        */
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        virtual TBool ActiveExecContinue(
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            CVtUiActiveExec& aActiveExec,
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            TInt& aState, 
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            const TInt aError ) = 0;
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        /**
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        * Cancels operation of specific state.
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        * @param aActiveExec active executor.
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        * @param aState state.
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        */
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        virtual void ActiveExecCancel( 
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            CVtUiActiveExec& aActiveExec,
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            const TInt aState ) = 0;
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        /**
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        * Informs that operation has been finished.
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        * @param aActiveExec active executor.
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        * @param aInitialState initial state.
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        */
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        virtual void ActiveExecDone( 
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            CVtUiActiveExec& aActiveExec,
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            const TInt aInitialState ) = 0;
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    };
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/**
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*  Asynchronous execution class for Video Telephone application.
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*
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*  @since Series 60 2.6
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*/
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class CVtUiActiveExec 
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    : public CActive
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    {
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    public: // Constructors and destructor
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        /**
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        * Constructor.
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        * @param aPriority priority of the active object.
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        */
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        CVtUiActiveExec(
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            const TInt aPriority );
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        /**
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        * Destructor.
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        */
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        ~CVtUiActiveExec();
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    public: // New functions
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        /**
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        * Starts execution.
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        * @param aStartState initial state.
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        * @param aExec executor.
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        */
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        void Start( 
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            TInt aStartState, 
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            MVtUiActiveExec& aExec );
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        /**
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        * Initial state of currently
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        * active operation.
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        *
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        * @return initial state, or KErrNotFound if no operation ongoing.
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        */
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        TInt InitialState() const;
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        /**
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        * Returns request status.
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        * @return request status.
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        */
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        TInt RequestStatus() const;
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    public: // Functions from base classes
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        /**
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        * @see CActive::RunL.
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        */
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        virtual void RunL();
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        /**
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        * @see CActive::DoCancel.
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        */
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        virtual void DoCancel();
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        /**
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        * @see CActive::RunError.
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        */
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        virtual TInt RunError( TInt aError );
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    private:
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        // Ref to active executor.
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        MVtUiActiveExec* iActiveExec;
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        // Initial state.
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        TInt iInitialState;
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        // Current state.
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        TInt iCurrentState;
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        // Next state.
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        TInt iNextState;
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    };
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#endif // CVTUIACTIVEEXEC_H
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// End of File