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/*
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* Copyright (c) 1999-2009 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:
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*
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*/
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#ifndef __MEDOBSRV_H__
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#define __MEDOBSRV_H__
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#include <e32def.h>
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class MEditObserver
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/**
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Specifies the mixin protocol for a rich text edit observer.
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This class is implemented by controls which use a rich text (CRichText) object,
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when it is possible for the text object to be changed from outside of the
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control without the control's knowledge.
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An edit observer is a callback to the control from the CRichText object which
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it has been set up to observe. The edit observer is set up using CRichText::SetEditObserver().
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@publishedAll
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@released
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*/
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{
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public:
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// Observer function called by CRichText to signal changes to the text
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// buffer within it. A pointer to this function must be passed in to
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// a CRichText instance by <rich text instance>.SetEditObserver(<ptr>).
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// aStart is the start position of the edit and aExtent is the number
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// of characters added or, if negative, deleted after this position.
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/** Observer function called by the CRichText object when the object is edited
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to give notification of changes to its text buffer. In this way, the control
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knows how the text object has changed and can reformat and redraw the text
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object appropriately.
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A pointer to the observer object must have been passed in to a CRichText instance
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using CRichText::SetEditObserver().
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@param aStart The start position of the edit.
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@param aExtent The number of characters added or, if negative, deleted after
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this position. */
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virtual void EditObserver(TInt aStart, TInt aExtent) = 0;
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};
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#endif
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