williamr@2: // Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
williamr@2: // All rights reserved.
williamr@2: // This component and the accompanying materials are made available
williamr@2: // under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members
williamr@2: // which accompanies this distribution, and is available
williamr@2: // at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".
williamr@2: //
williamr@2: // Initial Contributors:
williamr@2: // Nokia Corporation - initial contribution.
williamr@2: //
williamr@2: // Contributors:
williamr@2: //
williamr@2: // Description:
williamr@2: //
williamr@2: 
williamr@2: #ifndef __LOGVIEWCHANGEOBSERVER_H__
williamr@2: #define __LOGVIEWCHANGEOBSERVER_H__
williamr@2: 
williamr@2: // System includes
williamr@2: #include <logwrap.h>
williamr@2: 
williamr@2: /**
williamr@2: This class allows a client of the log engine to observe specific change events within
williamr@2: a given view.
williamr@2: @publishedAll 
williamr@2: @released
williamr@2: */
williamr@2: class MLogViewChangeObserver
williamr@2: 	{
williamr@2: public:
williamr@2: 
williamr@2: 	/**Handle a change corresponding to a view addition
williamr@2: 	
williamr@2: 	This method is called when a log event is added to a view. The event maybe 
williamr@2: 	recently added,	or have existed for some time but only now meet the 
williamr@2: 	criteria of this view (i.e satisfy the filter) due to some other change.
williamr@2: 	
williamr@2: 	@param aId The id of the log event which has been added to the view.
williamr@2: 	@param aViewIndex The position within the view at which the event has been 
williamr@2: 	added.
williamr@2: 	@param aChangeIndex	In a series of changes, this is the index of the 
williamr@2: 	currently processing change. The change index will be greater than (or 
williamr@2: 	equal to) 0, and less than the total change count.
williamr@2: 	@param aTotalChangeCount This is the total count of all changes which will 
williamr@2: 	be processed in this batch.
williamr@2: 	 */
williamr@2: 	virtual void HandleLogViewChangeEventAddedL(TLogId aId, TInt aViewIndex, TInt aChangeIndex, TInt aTotalChangeCount) = 0;
williamr@2: 
williamr@2: 	/** Handle a change corresponding to a view change
williamr@2: 	
williamr@2: 	This method is called when a log event changes within a view.
williamr@2: 	
williamr@2: 	@param aId The id of the log event which has changed within the view.
williamr@2: 	@param aViewIndex The position within the view where the change occurred.
williamr@2: 	@param aChangeIndex	In a series of changes, this is the index of the 
williamr@2: 	currently processing change. The change index will be greater than (or 
williamr@2: 	equal to) 0, and less than the total change count.
williamr@2: 	@param aTotalChangeCount This is the total count of all changes which will 
williamr@2: 	be processed in this batch.
williamr@2: 	 */
williamr@2: 	virtual void HandleLogViewChangeEventChangedL(TLogId aId, TInt aViewIndex, TInt aChangeIndex, TInt aTotalChangeCount) = 0;
williamr@2: 
williamr@2: 	/** Handle a change corresponding to a view deletion
williamr@2: 	
williamr@2: 	This method is called when a log event is removed from a view.
williamr@2: 	
williamr@2: 	@param aId The id of the log event which has been removed from the view
williamr@2: 	@param aViewIndex The position within the view which the event previously 
williamr@2: 	held.
williamr@2: 	@param aChangeIndex In a series of changes, this is the index of the 
williamr@2: 	currently processing change. The change index will be greater than (or 
williamr@2: 	equal to) 0, and less than the total change count.
williamr@2: 	@param aTotalChangeCount This is the total count of all changes which 
williamr@2: 	will be processed in this batch
williamr@2: 	 */
williamr@2: 	virtual void HandleLogViewChangeEventDeletedL(TLogId aId, TInt aViewIndex, TInt aChangeIndex, TInt aTotalChangeCount) = 0;
williamr@2: 	};
williamr@2: 
williamr@2: 
williamr@2: #endif