svgtviewer/SvgtViewerPlugin/UIControlInc/SvgtEventHandlerAO.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:40:16 +0200
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/*
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* Copyright (c) 2006 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:  This header file defines the  CSvgtEventHandlerAO class 
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*
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*/
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#ifndef SVGTEVENTHANDLERAO_H
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#define SVGTEVENTHANDLERAO_H
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// INCLUDES
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#include <e32base.h>
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#include <e32cmn.h>
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#include "SVGTCustControl.h"
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class MSvgtAppObserver;
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class CSVGTAppObserverUtil;
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class CSvgtEvent;
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_LIT(KSvgTagName, "svg");
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_LIT(KDataTagName, "data:");
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/**
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*       This class handles the event list & process the events 
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*       while progressive rendering
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*/
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class CSvgtEventHandlerAO : public CActive
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    {
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    public:
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        /**
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        * Two phase constructor
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        * @since 3.1
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        * @param aAppObserverUtil AppOberserverUtil Object
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        * @param aEngine Engine object 
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        * @param aCustControl
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        * @return CSvgtEventHandlerAO*
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        */
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        static CSvgtEventHandlerAO* NewL(MSvgtAppObserver* aAppObserverUtil, 
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                                            CSVGTCustControl* aCustControl,
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                                            const TThreadId aMainThreadId );
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        /**
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        *  Destructor
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        */
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        virtual ~CSvgtEventHandlerAO();
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        /**
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        * It adds the event (except redraw event) to the event queue.
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        * @since 3.1
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        * @param aEvent Event Object
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        * @return TBool
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        */
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        TBool AddEventToList(CSvgtEvent* aEvent);
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        /**
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        * It adds the redraw event to the event queue.
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        * @since 3.1
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        * @param aForceAdd Decides whether to add the redraw event forcefully
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        * @return TBool
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        */
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        TBool AddRedrawEventToList( const TBool aForceAdd = EFalse);
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        /**
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        * It make the request complete.
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        * @since 3.1
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        * @param aError Error code for the service provided
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        * @return none
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        */
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        void MakeRequestComplete( TInt aError );
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        /**
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        * It indicates that document is document loading completed.
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        * @since 3.1
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        * @return none
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        */
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        void SetDocumentComplete();
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    private:
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        /**
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        * Handles an active object's request completion event.
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        * @since 3.1
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        * @see CActive
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        */
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        void RunL();
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        /**
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        * Cancels all the request
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        * @since 3.1
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        * @see CActive
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        */
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        void DoCancel();
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        /**
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        * Handles a leave occurring in the request completion event handler RunL().
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        * @since 3.1
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        * @see CActive
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        */
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        TInt RunError( TInt aError );
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        /**
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        * It determines whether the time elapsed or not.
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        * @since 3.1
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        * @return TBool
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        */
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        TBool IsRedrawTimeElapsed();
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        /**
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        * Terminates the active object
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        * @since 3.1
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        */
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        void DoTerminate();
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    private:    //class methods
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        /**
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        * constructor
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        */
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        CSvgtEventHandlerAO(MSvgtAppObserver* aAppObserverUtil, 
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                                CSVGTCustControl* aCustControl, 
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                                const TThreadId aMainThreadId );
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        /**
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        * Two phase constructor
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        * @since 3.1
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        */
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        void ConstructL();
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    private:    //Data members
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        CSVGTAppObserverUtil* iAppObserverUtil;
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        CSvgEngineInterfaceImpl* iSvgEngine;
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        CSVGTCustControl* iCustControl;
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        RPointerArray<CSvgtEvent>   iEventList;
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        // Stores the previous time stamp
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        TTime iPreviousRedrawClock;
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        TThreadId iMainThreadId;
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        TBool iIsDocumentComplete;
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        TInt iStepCount;
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        TInt iSvgTimeBetweenRedraw;
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        // For Synchronising RequestComplete() calls
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        RCriticalSection iCritSection;
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    };
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#endif  //SVGTEVENTHANDLERAO_H
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// End of File