menufw/menufwui/mmwidgets/inc/mmfloatingitem.h
author Fionntina Carville <fionntinac@symbian.org>
Mon, 15 Nov 2010 11:25:21 +0000
branchRCL_3
changeset 105 a533a8e36da8
parent 0 f72a12da539e
permissions -rw-r--r--
Bug 3539. Update localisation mappings.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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* Copyright (c) 2007 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:  floating item
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*
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*/
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#ifndef T_MMFLOATINGITEM_H
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#define T_MMFLOATINGITEM_H
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#include <e32std.h>
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#include <e32base.h>
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#include "mmwidgetsconstants.h"
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/**
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 * Floating item.
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 * 
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 * This class describes a floating item element. Floating item is an extension
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 * to the way grid and list widgets are drawn. Since widgets are very restrictive,
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 * as to the place where na item is drawn (since in both grid and list each item
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 * has a pretty well defined place) there had to be a way to draw items off the
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 * standard place. Together with CMMDrawerAnimator, these classes support
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 * drawing of dragged item as well as other off place items such as animation 
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 * frames.
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 * Floating items as such support the idea of animation, as each of the items
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 * are aware of the animation step, and may modify its own position, whenever
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 * requested. However a timer in this manner is needed, and this role is 
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 * performed by CMMDrawerAnimator, which is aware of the redraw speed, and may
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 * control the state of all instances of TMMFloatingItem.
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 * It should be noted that both TMMFloatingItem and CMMDrawerAnimator doesn't 
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 * handle item's drawing on it's own. These classes just control the logical 
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 * state of floating items. All floating items are associated with the 
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 * CMMListBoxItemDrawer in an array, and drawn whenever a Draw operation is 
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 * performed on the widget, or any particular item, that is in any way overlapped
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 * by a floating item.
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 * 
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 * @see CMMDrawerAnimator
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 * @lib mmwidgets
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 * @since S60 v5.0
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 * @ingroup group_mmwidgets
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 */
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class CListBoxView;
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class TMmFloatingItem
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    {
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public:
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    /**
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     * Constructor.
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     * 
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     * If a non-null value for the aView parameter is supplied, then item position
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     * will be relative, so when the view is scrolled the floating item will move
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     * just like all the non-floating items.
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     * If aView is NULL, then item position will be absolute, meaning that it will
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     * not change when the view is scrolled. 
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     *
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     * @since S60 ?S60_version
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     * @param aDrawnIndex Index of the item which is going to 
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     *                        be draw off place.
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     * @param aStartPosition Position of the item (always expressed in screen
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     *                       coordinates, even when creating an item with relative
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     *                       position).
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     * @param aType Type of the floating item.
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     * @param aAnimationFrames Total number of animation frames to perform.
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     * @param aView The view on which items are drawn (optional - affects
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     *        scrolling behavior).
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     */
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    TMmFloatingItem( TInt aDrawnIndex, TPoint aStartPosition,
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            TMmFloatingItemType aType, TInt aAnimationFrames,
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            CListBoxView* aView = NULL );
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    /**
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     * Sets the flag of manual delete. If such flag is set
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     * the floating item will not perfrom self removal. Normally
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     * floating items remove themselves fram the drawing buffer whenever 
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     * the animation is finished. This is used for example for
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     * dragged items, since they are not animated, and they will be
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     * deleted manual when the uses lets go of the drag.
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     *
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     * @since S60 5.0
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     * @param aManual Flag of manual deletion.
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     */
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    void SetManualDelete( TBool aManual );
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    /**
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     * Performs a step of the animation, according to 
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     * earlier provided information.
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     *
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     * @since S60 5.0
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     */
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    TBool MakeStep();
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    /**
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     * Set the difference in the location of the floating item
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     * from the originating position of the item, to the resulting
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     * position of the animation
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     *
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     * @since S60 5.0
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     * @param aDiffetenceVector Vector of displacement.
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     */
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    void SetPositionStep( TPoint aDiffetenceVector  );
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    /**
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     * Set the size of the step that modifies the size of the
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     * item with every step of the animation.
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     *
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     * @since S60 5.0
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     * @param aStartSize Initial size of the item.
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     * @param aFinalSize Final size of the item.
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     */
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    void SetSizeStep( TReal aStartSize, TReal aFinalSize );   
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    /**
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     * Gets the current zoom ratio. The ratio might by
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     * time specific, since floating items support animations
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     * changing size of the item.
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     *
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     * @since S60 5.0
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     * @return Zooming ratio.
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     */
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    TReal GetCurrentZoomRatio() const;
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    /**
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     * Gets the type of the floating item.
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     *
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     * @since S60 5.0
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     * @return Type of the floating item.
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     */    
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    TMmFloatingItemType GetFloatingItemType() const;
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    /**
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     * Gets the item index of the item being drawn.
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     *
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     * @since S60 5.0
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     * @return Item of the item drawn.
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     */    
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    TInt GetDrawnItemIndex() const;
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    /**
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     * Gets the current item position.
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     * 
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     * The position returned is always expressed in screen coordinates,
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     * even if this item's position is relative.
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     *
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     * @since S60 5.0
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     * @return Position of the item.
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     */    
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    TPoint GetItemPosition() const;
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    /**
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     * Marks the item as invalid. Item will be deleted 
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     * from the cache when an attempt to draw the item
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     * occurs.
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     *
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     * @since S60 5.0
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     */    
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    void InvalidateFloatingItem();
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    /**
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     * Tests if the item is still valid.
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     *
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     * @since S60 5.0
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     */    
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    TBool IsFloatingItemValid() const;
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    /**
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     * Zooming status is returned, meaning if the item is still 
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     * in the state of zoming in, zooming out, or in normal size
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     * 
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     * @since S60 5.0
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     * @return Negative value is returned if the item is zooming out.
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     *         Positive value is returned if item is zooming in.
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     *         Zero is returned if the item is static in size.
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     */
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    TInt GetZoomingStatus();
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    /**
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     * Checks if the item has the manual deletion
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     * flag setup.
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     *
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     * @since S60 5.0
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     * @return The status of manual deletion flag.
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     */    
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    TBool IsManualDelete();
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    /**
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     * Calculates consequent steps
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     *
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     * @since S60 5.0
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     * @param aVector Displacement vector.
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     */    
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    void CalculateSteps(TPoint aVector);
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private:
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    /**
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     * Index of the item, which is being animated. 
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     */  
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    TInt iDrawnItemIndex;
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    /**
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     * Current item position.
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     * 
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     * This can be either an absolute position (expressed in screen coordinates) or
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     * a relative position depending on whether iView member variable is NULL.
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     * In the latter case, the position is relative to the top-left corner of the
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     * first item in the view.
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     */  
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    TPoint iItemPosition;
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    /**
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     * Dispalcement of the item, per animation step.
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     */  
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    TFixedArray<TPoint, MmEffects::KMaximumAnimationFramesCount> iPositionStep;
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    /**
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     * Size change, per animation step.
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     */  
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    TReal iSizeStep;
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    /**
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     * Counter of animation frames.
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     */  
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    TInt iFrameCounter;
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    /**
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     * Total number of animation frames to perform.
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     */  
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    TInt iFrames;
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    /**
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     * Manual deletion flag.
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     */  
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    TBool iManualDelete;
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    /**
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     * Current scaling ratio.
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     */  
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    TReal iZoomRatio;
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    /**
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     * Type of the floating item. There is a need for distinction
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     * between different animations types.
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     */  
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    TMmFloatingItemType iType; 
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    /**
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     * The view on which items are drawn.
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     * 
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     * When iView is NULL, then iItemPosition contains absolute item position.
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     * Otherwise iItemPostion contains item position relative to the top-left
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     * corner of the first item in the view. 
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     */
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    CListBoxView* iView;
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    };
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#endif // T_MMFLOATINGITEM_H