author | hgs |
Mon, 03 May 2010 00:53:50 +0530 | |
changeset 40 | 112f0ac2d1f0 |
parent 23 | 74c9f037fd5d |
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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: Reader interface of media item lists |
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* |
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*/ |
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#ifndef M_GLXMEDIALIST_H |
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#define M_GLXMEDIALIST_H |
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#include <mpxcollectionpath.h> |
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#include <mpxfilter.h> |
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#include <mpxcommand.h> |
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#include <glxhierarchyid.h> |
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#include <glxlistdefs.h> |
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#include "glxmedia.h" // For TGlxMediaId |
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#include "glxmedialistid.h" |
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// Forward declarations |
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class MMPXCollection; |
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class MGlxMediaListObserver; |
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class MGlxFetchContext; |
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/** |
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* MGlxMediaList |
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* |
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* Interface for reading lists of media items |
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* |
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* @lib glxmedialists.lib |
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*/ |
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class MGlxMediaList |
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{ |
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public: |
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/** |
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* Returns a new/existing media list interface. |
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* |
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* Returns an existing instance if and only if the hierarchy id and path |
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* are the same. Otherwise a new instance is returned |
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* |
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* Filter is only used when a new media list is created, otherwise it |
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* is ignored. |
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* |
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* The new/existing media list is set as highest priority list |
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* |
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* @param aPath Path to the collection |
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* @param aHierarchyId Id of the client hierarchy |
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* @param aFilter Filter on the collection |
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* @return Media list interface (does not pass ownership) |
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*/ |
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IMPORT_C static MGlxMediaList* InstanceL(const CMPXCollectionPath& aPath, |
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const TGlxHierarchyId& aHierarchyId = KGlxIdNone, CMPXFilter* aFilter = NULL); |
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|
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/** |
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* Releases a media list interface |
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*/ |
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virtual void Close() = 0; |
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|
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/** |
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* Id of this reader interface. The id of each _existing_ reader interface |
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* is guaranteed to be unique, but new readers can reuse the ids of deleted |
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* ones. |
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* |
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* @return Unique id of this interface |
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*/ |
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virtual TGlxMediaListId Id() const = 0; |
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|
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/** |
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* Count of media items in the list |
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* |
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* @return Count of media items |
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*/ |
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virtual TInt Count(NGlxListDefs::TCountType aType = NGlxListDefs::ECountAll) const = 0; |
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|
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/** |
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* Current focus position |
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* |
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* @return Index of focused item |
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*/ |
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virtual TInt FocusIndex() const = 0; |
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/** |
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* Sets the focus. |
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* The implementation of this function is required to call |
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* MGlxMediaListObserver::HandleFocusChangedL for all added |
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* observers. Calling this function will cause the item window |
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* to be updated and potentially properties and thumbnails |
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* to be loaded. |
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* |
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* @param aType whether the focus change is absolute or relative |
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* @param aValue value of the focus change |
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*/ |
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virtual void SetFocusL(NGlxListDefs::TFocusSetType aType, TInt aValue) = 0; |
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/** |
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* Media item at index. |
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* It is not legal to access items outside the preload |
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* (or visible) range. |
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* |
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* @param aIndex index of the item in the list |
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* @return Media item pointer |
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*/ |
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virtual const TGlxMedia& Item(TInt aIndex) const = 0; |
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|
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/** |
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* Item index by media item id |
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* If the item is not within the preload (or visible) range |
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* returns KErrNotFound. The item may still exist in the full |
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* list. This behavior can be changed, if there is a use case. |
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* |
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* @param aId Unique id of the media item |
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* @return Index of the item in the list or KErrNotFound |
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*/ |
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virtual TInt Index(const TGlxIdSpaceId& aIdSpaceId, const TGlxMediaId& aId) const = 0; |
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|
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/** |
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* Add an observer that observes changes to the list. |
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* This observer will be informed whenever the items in the list |
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* change, more items get added, or items get deleted, or the |
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* focus changes. |
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* |
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* @param aObserver The observer |
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*/ |
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virtual void AddMediaListObserverL(MGlxMediaListObserver* aObserver) = 0; |
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|
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/** |
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* Removes a media item list observer from the observer list |
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* |
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* @param aObserver The observer |
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*/ |
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virtual void RemoveMediaListObserver(MGlxMediaListObserver* aObserver) = 0; |
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/** |
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* Registers a context that affects the behavior of attribute and thumbnail loading. |
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* @param aContext context to register |
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* @param aPriority priority of the context. The higher the more important. |
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*/ |
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virtual void AddContextL(const MGlxFetchContext* aContext, TInt aPriority) = 0; |
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/** |
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* Removes an existing context |
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* |
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* @param aContext Pointer of the context to be removed |
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*/ |
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virtual void RemoveContext(const MGlxFetchContext* aContext) = 0; |
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|
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/** |
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* Sets the specified contexts as highest priority contexts. Other |
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* contexts will retain their relative priority order, but will have |
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* less priority than the specified contexts. |
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* |
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* @param aContextIds Ids of the contexts to be set as highest priority. |
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* Id at index 0 in the array is set to be the highest priority, |
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* Id at index 1, the second highest, etc. |
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*/ |
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// virtual void SetContextAsHighestPriority(RArray<TGlxMediaListContextId> aContextIds) = 0; |
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|
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/** |
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* @returns the MPX collection utility that is bound to this list |
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*/ |
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virtual MMPXCollection& Collection() const = 0; |
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/** |
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* Current path, including selection. Ownership passed to caller. |
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* |
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* @return CMPXCollectionPath* representing current path |
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*/ |
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virtual CMPXCollectionPath* PathLC(NGlxListDefs::TPathType aType = NGlxListDefs::EPathAllOrSelection) const = 0; |
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|
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/** |
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* Determines if an item has been selected |
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* |
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* @param aIndex Index of the item to be checked for selection |
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* @return Boolean indication of the item selection |
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*/ |
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virtual TBool IsSelected(TInt aIndex) const = 0; |
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/** |
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* Item selection/deselection |
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* |
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* @param aIndex Index of the item to be selected/deselected |
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* @param aSelected Boolean to indicate selection/deselection |
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*/ |
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virtual void SetSelectedL(TInt aIndex, TBool aSelected) = 0; |
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/** |
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* Selection count |
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* |
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* @return TInt count of selected items |
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*/ |
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virtual TInt SelectionCount() const = 0; |
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/** |
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* Selected item index from selection |
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* |
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* @param aSelectionIndex Index in selection array |
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* @return TInt item index from selection |
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*/ |
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virtual TInt SelectedItemIndex(TInt aSelectionIndex) const = 0; |
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/** |
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* Sends a command to the collection |
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* |
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* @param aCommand MPX command from a command handler |
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*/ |
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virtual void CommandL(CMPXCommand& aCommand) = 0; |
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/** |
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* Cancels a command on the collection |
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*/ |
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virtual void CancelCommand() = 0; |
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/** |
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* Checks if a command is active or not |
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virtual TBool IsCommandActive()= 0; |
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/** |
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* Sets a filter on the collection. The filter will replace any existing |
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* filter applied on the collection. If a client needs an aggregate filter, |
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* they will need to obtain the currently applied filter using Filter() and |
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* merge the filters |
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* |
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* @param aFilter MPX filter on the collection. Ownership passed to media list |
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*/ |
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virtual void SetFilterL(CMPXFilter* aFilter) = 0; |
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/** |
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* Filter on the collection |
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* |
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* @return CMPXFilter on the collection |
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*/ |
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virtual CMPXFilter* Filter() const = 0; |
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/** |
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* The Id Space Id of the media list. |
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* |
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* @param aIndex index of the item in the list |
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* @return The Id Space of the media list |
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*/ |
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virtual TGlxIdSpaceId IdSpaceId(TInt aIndex) const = 0; |
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/** |
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* Returns ETrue if the media list has been |
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* populated else EFalse |
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*/ |
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virtual TBool IsPopulated() const = 0; |
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/** |
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* Adds a static item and takes ownership |
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* Note: In case of a leave, aStaticItem may have been modified. |
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* It is assumed that since ownership of the static item is passed, |
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* the object is free to be modified. |
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* @param aStaticItem Static item to be added |
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* @param aTargetPosition Whether to be added at beginning or end |
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*/ |
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virtual void AddStaticItemL( CGlxMedia* aStaticItem, |
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NGlxListDefs::TInsertionPosition aTargetPosition ) = 0; |
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/** |
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* Remove static item from the list. |
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* @param aItemId Id of item to remove |
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*/ |
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virtual void RemoveStaticItem(const TGlxMediaId& aItemId) = 0; |
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/** |
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* Enables or disables static items |
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* @param aEnabled true if static items should be enabled |
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* false if static items should be disabled |
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*/ |
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virtual void SetStaticItemsEnabled( TBool aEnabled ) = 0; |
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/** |
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* Tests if static items are enabled. |
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* @return ETrue if static items are enabled |
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*/ |
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virtual TBool IsStaticItemsEnabled() const = 0; |
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/** |
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* Sets the initial focus position, first or last item |
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* @param aFocusInitialPosition initial focus on first or last item |
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*/ |
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virtual void SetFocusInitialPosition(NGlxListDefs::TFocusInitialPosition aFocusInitialPosition) = 0; |
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/** |
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* Resets the focus to the initial position |
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*/ |
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virtual void ResetFocus() = 0; |
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/** |
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* Unmarks all items in the medialist. |
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* @param aList Reference to Medialist items. |
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*/ |
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IMPORT_C static void UnmarkAllL( MGlxMediaList& aList ); |
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/** |
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* Sets the dataWindow position. |
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* The implementation of this function is required for the |
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* item window to be updated while blocky iterator is used |
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* and potentially properties and thumbnails to be loaded. |
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* |
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* @param aIndex value of the dataWindow change |
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*/ |
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virtual void SetVisibleWindowIndexL( TInt aIndex) = 0; |
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/** |
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* Current visible dataWindow position |
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*/ |
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virtual TInt VisibleWindowIndex() const = 0; |
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virtual ~MGlxMediaList() {}; |
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/** |
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* Cancel the pending requests |
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*/ |
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virtual void CancelPreviousRequests() = 0; |
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}; |
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#endif // M_GLXMEDIALIST_H |
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