1 /*

     2 * Copyright (c) 1999-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18 

    19 #ifndef __MEDOBSRV_H__

    20 #define __MEDOBSRV_H__

    21 

    22 #include <e32def.h>

    23 

    24 

    25 

    26 class MEditObserver

    27 /** 

    28 Specifies the mixin protocol for a rich text edit observer. 

    29 

    30 This class is implemented by controls which use a rich text (CRichText) object, 

    31 when it is possible for the text object to be changed from outside of the 

    32 control without the control's knowledge.

    33 

    34 An edit observer is a callback to the control from the CRichText object which 

    35 it has been set up to observe. The edit observer is set up using CRichText::SetEditObserver(). 

    36 @publishedAll

    37 @released

    38 */

    39 	{

    40 public:

    41 	// Observer function called by CRichText to signal changes to the text

    42 	// buffer within it. A pointer to this function must be passed in to

    43 	// a CRichText instance by <rich text instance>.SetEditObserver(<ptr>).

    44 	// aStart is the start position of the edit and aExtent is the number

    45 	// of characters added or, if negative, deleted after this position.

    46 	

    47 	

    48 	/** Observer function called by the CRichText object when the object is edited 

    49 	to give notification of changes to its text buffer. In this way, the control 

    50 	knows how the text object has changed and can reformat and redraw the text 

    51 	object appropriately.

    52 	

    53 	A pointer to the observer object must have been passed in to a CRichText instance 

    54 	using CRichText::SetEditObserver().

    55 	

    56 	@param aStart The start position of the edit. 

    57 	@param aExtent The number of characters added or, if negative, deleted after 

    58 	this position. */

    59 	virtual void EditObserver(TInt aStart, TInt aExtent) = 0;

    60 	};

    61 

    62 #endif