author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 15 Jul 2010 18:39:01 +0300 | |
branch | RCL_3 |
changeset 56 | b023a8d2866a |
parent 0 | 4e91876724a2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008-2009 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: Iterators for traversing lists |
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* |
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*/ |
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#ifndef __C_GLXMEDIALISTITERATOR_H__ |
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#define __C_GLXMEDIALISTITERATOR_H__ |
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#include <e32std.h> |
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#include <glxmediaid.h> |
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class MGlxMediaList; |
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class T_CGlxSelectionIterator; // For E-Unit |
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class T_CGlxFromFocusOutwardIterator; // For E-Unit |
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|
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/** |
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* MGlxMediaListIterator |
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* |
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* Interface for going through items in the list in a |
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* non-sequential order. |
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* |
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* This class is primarily intended for Fetch contexts for going |
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* through the list's items in priority order. The intention is to abstract |
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* the selection and priorities of items from the attributes being requested. |
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* This allows reusing same fetch contexts with multiple item orders. |
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* Can hence have one attribute fethc context that requests first |
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* and last item and another attribute that requests some items |
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* starting from focus outwards, without duplicating the attribute fetch |
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* context code. The order classes can then also be reused in different |
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* fetch contexts, e.g., in thumbnail fetch context. |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class MGlxMediaListIterator |
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{ |
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public: |
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/** |
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* Resets to the first item to be returned |
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* What the first item index actually is is entirely |
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* up to the implementation. It could be the focus index, |
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* or it could be the first, or even last item in the list |
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* |
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* @return the index of the first item or KErrNotFound if |
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* first item does not exist |
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*/ |
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virtual void SetToFirst(const MGlxMediaList* aList) = 0; |
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/** |
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* Returns the index of the current item and moves to the next item |
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* @return the item index or KErrNotFound if the item does not exist |
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*/ |
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virtual TInt operator++(TInt) = 0; |
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/** |
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* @return ETrue if index is within range, EFalse otherwise |
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*/ |
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virtual TBool InRange(TInt aIndex) const = 0; |
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}; |
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/** |
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* TGlxSpecificIdIterator |
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* |
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* Used to retrieve attributes relating to one specific media |
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* id in a media list. |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class TGlxSpecificIdIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C TGlxSpecificIdIterator(const TGlxIdSpaceId& aIdSpaceId, TGlxMediaId aRequiredId); |
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public: // From MGlxMediaListIterator |
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void SetToFirst(const MGlxMediaList* aList); |
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TInt operator++(TInt); |
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TBool InRange(TInt aIndex) const; |
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private: |
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/** |
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* Required id |
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*/ |
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TGlxMediaId iMediaId; |
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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const TGlxIdSpaceId iIdSpaceId; |
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TBool iFinished; |
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}; |
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/** |
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* TGlxSequentialIterator |
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* |
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* Iterates though all the items in the list sequentially. |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class TGlxSequentialIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C TGlxSequentialIterator(); |
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public: // From MGlxMediaListIterator |
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void SetToFirst(const MGlxMediaList* aList); |
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TInt operator++(TInt); |
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TBool InRange(TInt aIndex) const; |
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public: |
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/** |
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* Set the maximum number of items to iterate through |
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* @param aRange Maximum number of items to iterate through. Set as KMaxTInt to remove limit |
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*/ |
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IMPORT_C void SetRange( TInt aRange ); |
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private: |
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TInt iCurrentItem; |
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/** |
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* The maximum number of items to retrieve |
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*/ |
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TInt iRange; |
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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}; |
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/** |
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* TGlxFirstThenLastIterator |
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* |
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* Ordered that returns the index of first and then the |
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* last item in the list |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class TGlxFirstThenLastIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C TGlxFirstThenLastIterator(); |
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IMPORT_C ~TGlxFirstThenLastIterator(); |
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// From MGlxMediaListIterator |
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virtual void SetToFirst(const MGlxMediaList* aList); |
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virtual TInt operator++(TInt); |
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virtual TBool InRange(TInt aIndex) const; |
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private: |
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/** |
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* The count or ordinal of the item that is currently "selected" |
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* This translates to how many times ++ has been called |
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*/ |
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TInt iCurrentItem; |
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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}; |
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/** |
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* TGlxFromFocusOutwardIterator |
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* |
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* Ordered that returns the index of the focused item first and |
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* then the surrounding items evenly from both sides |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class TGlxFromFocusOutwardIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C TGlxFromFocusOutwardIterator(); |
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IMPORT_C ~TGlxFromFocusOutwardIterator(); |
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/** |
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* Set the range offsets |
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*/ |
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IMPORT_C void SetRangeOffsets(TInt aRearOffset, TInt aFrontOffset); |
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// From MGlxMediaListIterator |
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virtual void SetToFirst(const MGlxMediaList* aList); |
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virtual TInt operator++(TInt); |
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virtual TBool InRange(TInt aIndex) const; |
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private: |
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/** |
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* The count or ordinal of the item that is currently "selected" |
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* This translates to how many times ++ has been called |
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*/ |
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TInt iCurrentItem; |
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/** |
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* Number of items within range after focus index |
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*/ |
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TInt iFrontOffset; |
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/** |
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* Number of items within range before focus index |
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*/ |
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TInt iRearOffset; |
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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// For E-Unit |
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friend class T_CGlxFromFocusOutwardIterator; |
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/** |
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* Number of items within range as configured by clients |
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* This shall be used to restore back |
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* while coming out of low memory conditions |
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*/ |
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TInt iOriginalFrontOffset; |
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TInt iOriginalRearOffset; |
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}; |
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/** |
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* TGlxFromIndexOutwardBlockyIterator |
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* |
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* Ordered that returns the index of the focused item first and |
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* then the surrounding items evenly from both sides |
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*/ |
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class TGlxFromIndexOutwardBlockyIterator : public MGlxMediaListIterator |
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{ |
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public: |
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class MGlxIndex |
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{ |
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public: |
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virtual TInt Index() const = 0; |
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}; |
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public: |
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IMPORT_C ~TGlxFromIndexOutwardBlockyIterator( ); |
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IMPORT_C TGlxFromIndexOutwardBlockyIterator(const MGlxIndex& aIndexFunctor); |
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/** |
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* Set the range offsets |
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*/ |
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IMPORT_C void SetRangeOffsets(TInt aRearOffset, TInt aFrontOffset); |
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// From MGlxMediaListIterator |
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virtual void SetToFirst(const MGlxMediaList* aList); |
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virtual TInt operator++(TInt); |
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virtual TBool InRange(TInt aIndex) const; |
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//protected: |
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/** |
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* Functor to return index in media list based on unknown rule |
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* Rule is defined by a deriving class |
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*/ |
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/* class MGlxIndex |
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{ |
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public: |
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virtual TInt Index() const = 0; |
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};*/ |
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private: |
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/** |
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* The count or ordinal of the item that is currently "selected" |
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* This translates to how many times ++ has been called |
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*/ |
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TInt iCurrentItem; |
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/** |
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* Number of items within range after focus index |
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*/ |
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TInt iFrontOffset; |
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/** |
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* Number of items within range before focus index |
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*/ |
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TInt iRearOffset; |
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/** |
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* Functor from which to get the index around which iteration centers (e.g., focus) |
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*/ |
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const MGlxIndex& iIndexFunctor; |
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protected: |
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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}; |
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/** |
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* TGlxFromFocusOutwardBlockyIterator |
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* |
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* Ordered that returns the index of the focused item first and |
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* then the surrounding items evenly from both sides |
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*/ |
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class TGlxFromFocusOutwardBlockyIterator : public TGlxFromIndexOutwardBlockyIterator, |
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public TGlxFromIndexOutwardBlockyIterator::MGlxIndex |
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{ |
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public: |
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IMPORT_C TGlxFromFocusOutwardBlockyIterator(); |
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IMPORT_C ~TGlxFromFocusOutwardBlockyIterator(); |
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// From MGlxIndex |
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TInt Index() const; |
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}; |
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/** |
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* TGlxFromManualIndexOutwardBlockyIterator |
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*/ |
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class TGlxFromManualIndexOutwardBlockyIterator : public TGlxFromIndexOutwardBlockyIterator, |
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public TGlxFromIndexOutwardBlockyIterator::MGlxIndex |
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{ |
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public: |
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IMPORT_C TGlxFromManualIndexOutwardBlockyIterator(); |
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IMPORT_C ~TGlxFromManualIndexOutwardBlockyIterator(); |
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IMPORT_C void SetIndex( TInt aIndex ); |
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// From MGlxIndex |
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TInt Index() const; |
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private: |
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TInt iIndex; |
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}; |
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/** |
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* TGlxSelectionIterator |
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* |
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* Iterates through the selected items of a media list |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class TGlxSelectionIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C TGlxSelectionIterator(); |
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IMPORT_C ~TGlxSelectionIterator(); |
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public: |
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/** |
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* Set the maximum number of selected items to iterate through |
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@param aMaxItems Maximum number of selected items to iterate through. Set as KMaxTInt to remove limit |
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*/ |
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IMPORT_C void SetRange(TInt aMaxItems); |
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/** |
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* Disables the iterator if the number of selected items is greater than |
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* the range. (specified using SetRange() above). |
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* @param aDisabledIfMoreThanRangeSelected If ETrue, the iterator is |
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* disabled if the number of selected items is greater than the range. |
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* If EFalse, the iterator is enabled if the number of selected items |
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* is greater than the range. |
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*/ |
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IMPORT_C void SetDisabledIfMoreThanRangeSelected(TBool aDisabledIfMoreThanRangeSelected); |
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// From MGlxMediaListIterator |
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IMPORT_C virtual void SetToFirst(const MGlxMediaList* aList); |
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IMPORT_C virtual TInt operator++(TInt); |
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IMPORT_C virtual TBool InRange(TInt aIndex) const; |
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private: |
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/** |
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* The count or ordinal of the item that is currently "selected" |
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* This translates to how many times ++ has been called |
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*/ |
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TInt iCurrentItem; |
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|
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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/** |
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* If ETrue, the iterator is disabled if the number of selected |
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* items is greater than the range. If EFalse, the iterator is enabled |
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* if the number of selected items is greater than the range. |
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*/ |
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TInt iDisabledIfMoreThanRangeSelected; |
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|
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/** |
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* The maximum number of selected items to iterate through. |
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*/ |
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TInt iRange; |
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|
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// For E-Unit |
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friend class T_CGlxSelectionIterator; |
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}; |
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|
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/** |
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* ExclusionIterator |
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* |
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* Iterates through the non visible items |
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* |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class TGlxExclusionIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C TGlxExclusionIterator( MGlxMediaListIterator &aIncludedItemsIterator, MGlxMediaListIterator &aExcludedItemsIterator ); |
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IMPORT_C ~TGlxExclusionIterator(); |
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|
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// From MGlxMediaListIterator |
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IMPORT_C void SetToFirst(const MGlxMediaList* aList); |
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TInt operator++(TInt); |
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TBool InRange(TInt aIndex) const; |
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private: |
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/** |
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* The iterator whixh specifies ,which items to be included. |
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*/ |
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MGlxMediaListIterator& iIncludedItemsIterator; |
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/** |
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* The iterator which specifies ,which items should be excluded., |
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*/ |
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MGlxMediaListIterator& iExcludedItemsIterator; |
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}; |
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/** |
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* TGlxFromManualIndexBlockyIterator |
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* |
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* Ordered that returns the index of the visible window item first and |
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* then the surrounding items evenly from both sides |
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*/ |
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class TGlxFromManualIndexBlockyIterator : public MGlxMediaListIterator |
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{ |
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public: |
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IMPORT_C ~TGlxFromManualIndexBlockyIterator( ); |
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IMPORT_C TGlxFromManualIndexBlockyIterator( ); |
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/** |
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* Set the range offsets |
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*/ |
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IMPORT_C void SetRangeOffsets(TInt aRearOffset, TInt aFrontOffset); |
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// From MGlxMediaListIterator |
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virtual void SetToFirst(const MGlxMediaList* aList); |
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virtual TInt operator++(TInt); |
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virtual TBool InRange(TInt aIndex) const; |
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private: |
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/** |
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* The count or ordinal of the item that is currently "selected" |
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* This translates to how many times ++ has been called |
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*/ |
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TInt iCurrentItem; |
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/** |
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* Number of items within range after visible index |
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*/ |
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TInt iFrontOffset; |
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/** |
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* Number of items within range before visible index |
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*/ |
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TInt iRearOffset; |
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/** |
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* Number of items within range as configured by clients |
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* This shall be used to restore back |
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* while coming out of low memory conditions |
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*/ |
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TInt iOriginalFrontOffset; |
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TInt iOriginalRearOffset; |
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TInt iDefaultVisItems; |
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protected: |
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/** |
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* List being traversed |
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*/ |
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const MGlxMediaList* iList; |
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}; |
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#endif // __C_GLXMEDIALISTITERATOR_H__ |
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