author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:45:44 +0200 | |
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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: Base classes for multi-purpose tasks. |
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* |
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*/ |
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/** |
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* @internal reviewed 30/07/2007 by Simon Brooks |
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*/ |
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#ifndef C_GLXTNTASK_H |
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#define C_GLXTNTASK_H |
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#include "glxtnstd.h" |
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#include <glxmediaid.h> |
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#include <e32base.h> |
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// Forward declarations |
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class CGlxtnTaskManager; |
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class MGlxtnThumbnailCreatorClient; |
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class MGlxtnThumbnailStorage; |
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/** |
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* Base class for thumbnail tasks. |
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* |
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* @ingroup glx_thumbnail_creator |
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*/ |
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NONSHARABLE_CLASS(CGlxtnTask) : public CBase |
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{ |
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friend class CGlxtnTaskManager; |
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public: |
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/** |
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* Different state a task can go through |
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*/ |
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enum TState |
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{ |
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EIdle, /**< Task is not ready to start */ |
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EStarting, /**< Task is ready to start */ |
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ERunning, /**< Task is currently running */ |
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ECanceled, /**< Task has been cancelled, and can be deleted */ |
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EComplete /**< Task has finished, and can be deleted */ |
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}; |
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public: |
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CGlxtnTask(const TGlxtnTaskId& aId, const TGlxMediaId& aItemId, |
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MGlxtnThumbnailStorage* aStorage); |
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~CGlxtnTask(); |
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/** |
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* Gets the current task specific state |
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* @returns TState The task current state. |
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*/ |
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inline TState State() const; |
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/** |
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* Gets the type of task this is. |
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* @returns TGlxtnTaskId Task type ID. |
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*/ |
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inline TGlxtnTaskId Id() const; |
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/** |
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* Gets the media ID of the item to which this task relates. |
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* @returns TGlxMediaId Media ID. |
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*/ |
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inline TGlxMediaId ItemId() const; |
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/** |
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* Sets the priority of the task. By default it is set to |
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* EPriorityStandard. |
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*/ |
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inline void SetPriority(TInt aPriority); |
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/** |
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* Gets the task priority. |
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* @returns TInt Task priority. |
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*/ |
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inline TInt Priority() const; |
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/** |
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* Get thumbnail storage for the task to use, if any. |
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* @returns Pointer to thumbnail storage, or NULL if none. |
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*/ |
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inline MGlxtnThumbnailStorage* Storage() const; |
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/** |
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* Provides a pointer to the task manager. |
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* @param aManager Pointer to the task manager. |
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*/ |
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virtual void SetManager(CGlxtnTaskManager* aManager); |
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private: // For CGlxTaskManager only |
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/** |
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* Starts the task |
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*/ |
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void StartL(TRequestStatus& aStatus); |
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|
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/** |
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* Cancels the task |
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*/ |
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void Cancel(); |
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|
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/** |
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* Runs a bit of the task |
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*/ |
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void RunL(TRequestStatus& aStatus); |
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|
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/** |
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* Handle a leave in StartL or RunL. |
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*/ |
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void RunError(TInt aError); |
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|
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protected: |
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/** |
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* Starts the task. |
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* @param aStatus Request status for asynchronous operations |
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* @returns -ETrue if the task has issued an asyncronous request. |
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* CActive::SetActive() will be called in this case and the |
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* task state will be ERunning. |
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* -EFalse if the task has not issued a request. |
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* SetActive will not be called and the task state will be |
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* EComplete. |
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*/ |
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virtual TBool DoStartL(TRequestStatus& aStatus) = 0; |
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|
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/** |
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* Cancels the task. The task's state will be set to ECanceled. |
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*/ |
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virtual void DoCancel() = 0; |
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|
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/** |
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* Runs a bit of the task |
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* @param aStatus Request status for asynchronous operations |
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* @returns -ETrue if the task has issued an asyncronous request. |
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* CActive::SetActive() will be called in this case and the |
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* task state will be ERunning. |
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* -EFalse if the task has not issued a request. |
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* SetActive will not be called and the task state will be |
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* EComplete. |
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*/ |
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virtual TBool DoRunL(TRequestStatus& aStatus) = 0; |
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|
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/** |
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* Handle a leave in StartL or RunL. |
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* @param aError The error that occurred. |
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* @returns -ETrue if the task has issued an asyncronous request. |
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* CActive::SetActive() will be called in this case and the |
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* task state will be ERunning. |
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* -EFalse if the task has not issued a request. |
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* SetActive will not be called and the task state will be |
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* EComplete. |
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*/ |
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virtual TBool DoRunError(TInt aError) = 0; |
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|
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protected: |
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/** |
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* Issues a request and sets the aStatus as KRequestPending |
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* Use this to make a synchronous operation asynchronous. |
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*/ |
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void SelfComplete(TRequestStatus& aStatus); |
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|
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private: |
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/** Task state */ |
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TState iState; |
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|
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/** Task id */ |
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TGlxtnTaskId iId; |
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|
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/** Media item id */ |
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TGlxMediaId iItemId; |
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|
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/** |
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* Priority of this task. |
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* The task schedule will execute tasks based on this priority |
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* When this task is run, the execution priority in CActiveScheduler |
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* will be this priority. (So it is comparable to priorities of active |
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* objects in the system.) |
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*/ |
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TInt iPriority; |
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|
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/** Thumbnail storage for the task to use (can be NULL) */ |
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MGlxtnThumbnailStorage* iStorage; |
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}; |
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|
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/** |
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* Base class for thumbnail tasks which return results to a client. |
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* |
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* @ingroup glx_thumbnail_creator |
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*/ |
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NONSHARABLE_CLASS(CGlxtnClientTask) : public CGlxtnTask |
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{ |
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protected: |
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CGlxtnClientTask(const TGlxtnTaskId& aId, const TGlxMediaId& aItemId, |
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MGlxtnThumbnailCreatorClient& aClient); |
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|
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/** |
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* Get the client for this task. |
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*/ |
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inline MGlxtnThumbnailCreatorClient& Client(); |
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private: |
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/** Client for this task */ |
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MGlxtnThumbnailCreatorClient& iClient; |
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}; |
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#include "glxtntask.inl" |
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#endif // C_GLXTNTASK_H |