uifw/EikStd/dlginc/aknformphysics.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:00:49 +0200
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permissions -rw-r--r--
Revision: 201003 Kit: 201005
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/*
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* Copyright (c) 2009 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:    Class to store physics related data in forms.
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*
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*/
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#ifndef C_CAKNFORMPHYSICS_H
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#define C_CAKNFORMPHYSICS_H
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#include <e32base.h>
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#include <aknphysicsobserveriface.h>
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class CAknPhysics;
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class CEikDialogPage;
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class CAknRecordingGc;
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/**
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 *  ?one_line_short_description
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 *  ?more_complete_description
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 *
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 *  @code
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 *   ?good_class_usage_example(s)
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 *  @endcode
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 *
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 *  @lib ?library
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 *  @since S60 ?S60_version *** for example, S60 v3.0
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 */
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NONSHARABLE_CLASS( CAknFormPhysics ) : public CBase, public MAknPhysicsObserver
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    {
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public:
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    /**
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    * Two-phased constructor.
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    */
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    static CAknFormPhysics* NewL( CEikDialogPage& aParent, CAknRecordingGc& aRecordingGc );
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    /**
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    * Destructor.
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    */
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    virtual ~CAknFormPhysics();
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    /**
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    * Initializes physics engine.
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    *
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    * @since S60 v5.0
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    * @param aWorldSize Collected size of all form items.
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    * @param aViewSize View's size i.e. size of form's rect.
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    * @param aViewCenter View center's initial position.
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    */
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    void InitPhysicsL( const TSize& aWorldSize, const TSize& aViewSize, const TPoint& aViewCenter );
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    /**
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    * Stops the physics engine.
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    *
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    * @since S60 v5.0
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    */
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    void Stop();
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    /**
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    * Starts the physics engine.
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    *
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    * @since S60 v5.0
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    * @param aLength Length of the flick on display (in pixels).
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    * @param aStartTime Flick's start time.
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    * @return ETrue if flicking was started.
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    */
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    TBool StartFlick( const TPoint& aLength, const TTime& aStartTime );
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    /**
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    * Returns highlight timeout. Tapped item should be activated only after a small delay.
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    *
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    * @since S60 v5.0
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    * @return Highlight delay.
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    */
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    TInt HighlightDelay() const;
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    /**
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    * Return drag event's treshold.
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    *
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    * @since S60 v5.0
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    * @return Drag treshold in pixels.
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    */
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    TInt DragThreshold() const;
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    /**
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    * Returns current view size.
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    *
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    * @since S60 v5.0
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    * @return View size.
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    */
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    TSize ViewSize() const;
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    /**
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    * Registers panning position to physics.
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    *
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    * @since S60 v5.0
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    * @aPosition Position delta.
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    */
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    void SetPanningPosition( const TPoint& aDelta );
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public: // From base class MAknPhysicsObserver.
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    /**
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     * Called when view position changes.
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     *
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     * @param  aNewPosition  The new position of the view.
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     * @param  aDrawNow      @c ETrue if the screen is to be redrawn,
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     *                       otherwise @c EFalse.
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     * @param  aFlags        Additional flags, not used currently.
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     */
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    virtual void ViewPositionChanged( const TPoint& aNewPosition,
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                                      TBool aDrawNow = ETrue,
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                                      TUint aFlags = 0 );
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    /**
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     * Physics emulation has stopped moving the view.
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     *
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     * @since S60 v5.0
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     */
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    virtual void PhysicEmulationEnded();        
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    /**
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     * Returns the observer's view position.
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     *
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     * @since S60 v5.0
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     *
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     * @return Physics observer's view position.
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     */
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    virtual TPoint ViewPosition() const;
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public: // New methods
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    /**
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     * Checks whether the physics engine can be stopped.
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     *
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     * @since S60 v5.0
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     * @return ETrue if the physics engine can be stopped.
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     */
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    TBool CanBeStopped() const;
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    /**
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     * Returns CAknPhysics action code i.e. which action CAknPhysics 
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     * is currently performing.
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     *
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     * @since S60 v5.2
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     * @return TAknPhysicsAction type action code.
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     */
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    TInt OngoingPhysicsAction() const;
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    /**
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     * Returns view's top y coordinate.
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     * 
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     * @since S60 v5.0
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     * @return View's top y coordinate in pixels, relative to 0. 
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     */
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    TInt ViewTopY() const;
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    /**
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     * Returns distance from view's top to its center. In other words,
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     * ViewPosition() == ViewTopY() + ViewDistance().
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     * 
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     * @since S60 v5.0
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     * @return Distance from view's top y to its center.
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     */
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    TInt ViewCenterDistance() const;
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    /**
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     * Sets view center position.
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     * 
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     * @since S60 v5.0
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     */
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    void SetViewCenter( const TPoint& aPosition );
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    /**
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     * Return view center position.
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     * 
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     * @since S60 v5.0
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     * @return View center.
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     */
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    TPoint ViewCenter() const;
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private:
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    /**
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    * Constructor.
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    */
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    CAknFormPhysics( CEikDialogPage& aParent, CAknRecordingGc& aRecordingGc );
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    /**
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    * Second stage constructor.
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    */
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    void ConstructL();
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    /**
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    * Checks whether panning and flicking are allowed with current world and
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    * view sizes.
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    *
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    * @since S60 v5.0
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    * @return ETrue if allowed.
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    */
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    TBool PhysicsAllowed() const;
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private: // data
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    /**
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    * Center of the "view" (the visible window to the whole form i.e. form's
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    * virtual rect).
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    */
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    TPoint iViewCenter;
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    /**
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     * Interface to the physics engine.
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     * Own.
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     */
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    CAknPhysics* iPhysics;
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    /**
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    * Dialog page whose scrolling is controlled by this class.
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    */
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    CEikDialogPage& iParent;
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    /**
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    * Graphics context used to cache drawing commands.
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    */
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    CAknRecordingGc& iRecordingGc;
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    /**
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    * Size of the "world".
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    */
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    TSize iWorldSize;
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    /**
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    * View size.
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    */
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    TSize iViewSize;
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    /**
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    * Benchmark timestamp.
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    */
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    TTime iStartTime;
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    /**
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    * Benchmark frame counter.
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    */
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    TInt iFrameCount;
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    };
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#endif // C_CAKNFORMPHYSICS_H