/*

* Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

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

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Interface for handling control's state change.

*

*/

#if !defined(__AKNEDSTSOBS_H__)

#define __AKNEDSTSOBS_H__

// FORWARD DECLERATIONS

class CAknEdwinState;

// CLASS DECLERATION

/**

* Interface for handling control's state change.

* 

* @since Series 60 0.9

*/

class MAknEdStateObserver

	{

public:

	/** 

    * Observer event types.

    */

	enum EAknEdwinStateEvent

        {

        /** The state has been updated */ 

        EAknEdwinStateEventStateUpdate, 

        /** The input mode has been updated */     

        EAknEdwinStateInputModeUpdate,

        /** The case mode has been updated */   

        EAknEdwinStateCaseModeUpdate,

        /** The local language has been updated */    

        EAknEdwinStateLocalLanguageUpdate, 

        /** The flags have been updated */  

        EAknEdwinStateFlagsUpdate,

        /** The edwin state needs to be sync'ed */

        EAknSyncEdwinState,

        /** Cursor position has changed in editor */

        EAknCursorPositionChanged,

        /** VKB/HW activation request */

        EAknActivatePenInputRequest,

        /** Prompt Text has changed */

        EAknEdwinStatePromptUpdate,

        /** editor is destroyed */

        EAknEdwinDestroy,

        /** VKB/HW close request */

        EAknClosePenInputRequest

        };

public:

	/**

    * Handles an state event from a observed control.

    * Pure virtual function that is called when a control, for which this

    * control is the observer, calls @c ReportAknedstateEventL().

    * It should be implemented by the observer control and should handle all

    * state events sent by controls it observed. 

    * @param aAknEdwinState The control that sent the event.

    * @param aEventType The event type defined in @c EAknEdwinStateEvent.

    */

	virtual void HandleAknEdwinStateEventL(CAknEdwinState* aAknEdwinState,

		EAknEdwinStateEvent aEventType) = 0;

	};

#endif