/*

* Copyright (c) 2007-2009 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:  ESMR observer for the custom list component

*

*/

#ifndef MESMRLISTOBSERVER_H

#define MESMRLISTOBSERVER_H

//<cmail>

#include "esmrdef.h"

//</cmail>

class CESMRField;

/**

 *  Observer interface for the custom list component.

 *

 *  @see cesmrlistcomponent.h

 *  @lib esmrgui.lib

 */

 class MESMRListObserver

    {

public:

    /**

     * Method to be called when field wants to notify that its size has changed.

     * By calling this, all the positions and sizes in the list are recalculated

     *

     * @param aCtrl - caller field.

     */

    virtual void ControlSizeChanged( CESMRField* aCtrl ) = 0;

    /**

     * Sets field to be visible in the list.

     *

     * @param aField - id of the field.

     */

    virtual void InsertControl( TESMREntryFieldId aField ) = 0;

    /**

     * Disables field in the list. This method does not delete field.

     *

     * @param aField - id of the field.

     */

    virtual void RemoveControl( TESMREntryFieldId aField ) = 0;

    /**

     * Is field visible or not.

     *

     * @return Boolean ETrue/EFalse

     */

    virtual TBool IsControlVisible( TESMREntryFieldId aField ) = 0;

    /**

     * Sets field to be focused.

     *

     * @param aField - id of the field.

     */

    virtual void SetControlFocusedL( TESMREntryFieldId aField ) = 0;

    /**

     * Scrolls the specific field to be fully visible

     *

     * @param aInd Index of the field that needs to be fully visible

     * @param aSizeChanged ETrue if the field size has been changed

     */

    virtual void ScrollItemVisible( TInt aInd ) = 0;

// SCROLLING_MOD: Two methods for CESMRRichTextViewer usage

    virtual void MoveListAreaDownL( TInt aAmount) = 0;

    virtual void MoveListAreaUpL(TInt aAmount) = 0;

    virtual TInt ListHeight() = 0;

    virtual TBool IsFieldBottomVisible() = 0;

    };

#endif // MESMRLISTOBSERVER_H