sl@0: /*
sl@0: * Copyright (c) 1999-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #ifndef __MEDOBSRV_H__
sl@0: #define __MEDOBSRV_H__
sl@0: 
sl@0: #include <e32def.h>
sl@0: 
sl@0: 
sl@0: 
sl@0: class MEditObserver
sl@0: /** 
sl@0: Specifies the mixin protocol for a rich text edit observer. 
sl@0: 
sl@0: This class is implemented by controls which use a rich text (CRichText) object, 
sl@0: when it is possible for the text object to be changed from outside of the 
sl@0: control without the control's knowledge.
sl@0: 
sl@0: An edit observer is a callback to the control from the CRichText object which 
sl@0: it has been set up to observe. The edit observer is set up using CRichText::SetEditObserver(). 
sl@0: @publishedAll
sl@0: @released
sl@0: */
sl@0: 	{
sl@0: public:
sl@0: 	// Observer function called by CRichText to signal changes to the text
sl@0: 	// buffer within it. A pointer to this function must be passed in to
sl@0: 	// a CRichText instance by <rich text instance>.SetEditObserver(<ptr>).
sl@0: 	// aStart is the start position of the edit and aExtent is the number
sl@0: 	// of characters added or, if negative, deleted after this position.
sl@0: 	
sl@0: 	
sl@0: 	/** Observer function called by the CRichText object when the object is edited 
sl@0: 	to give notification of changes to its text buffer. In this way, the control 
sl@0: 	knows how the text object has changed and can reformat and redraw the text 
sl@0: 	object appropriately.
sl@0: 	
sl@0: 	A pointer to the observer object must have been passed in to a CRichText instance 
sl@0: 	using CRichText::SetEditObserver().
sl@0: 	
sl@0: 	@param aStart The start position of the edit. 
sl@0: 	@param aExtent The number of characters added or, if negative, deleted after 
sl@0: 	this position. */
sl@0: 	virtual void EditObserver(TInt aStart, TInt aExtent) = 0;
sl@0: 	};
sl@0: 
sl@0: #endif