/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  This file contains the header of the 

*                MHWRMHapticsActuatorObserver class.

*

*/

#ifndef M_HWRMHAPTICSACTUATOROBSERVER_H

#define M_HWRMHAPTICSACTUATOROBSERVER_H

#include <hwrmlogicalactuators.h>

/**

* MHWRMHapticsActuatorObserver observer class.

*

* A client should derive from this abstract class to receive

* logical actuator event notifications.

*

* @since S60 5.1

*/

class MHWRMHapticsActuatorObserver

    {

public:

    /**

    * @enum THWRMActuatorEvents

    * 

    * Events that can happen to logical actuators.

    */    

    enum THWRMActuatorEvents

        {

        /**

        * This event occurs, when an actuator plugin of a previously

        * unsupported logical actuator type is installed to the device.

        *

        * In practice, this event may occur when the user of the device

        * starts using an external vibra device, which requires the 

        * installation of an actuator plugin currently not present in

        * the device.

        */

        EHWRMActuatorAttached,

        /**

        * This event occurs, when an actuator plugin of a previously

        * supported logical actuator type is uninstalled from the device.

        *

        * In practice, this event may occur when the user of the device

        * chooses to stop using an external vibra device, and uninstalls

        * a previously installed actuator plugin.

        */

        EHWRMActuatorDetached,

        /**

        * Actuator is currently enabled and it is ready to be used

        * as normal.

        *

        * Enabled/disabled state of an actuator is notified, when the

        * actuator is opened by a client and when the state changes

        * on runtime.

        */

        EHWRMActuatorEnabled,

        /**

        * Actuator is currently disabled and it is not able to handle

        * haptics commands. This state of a logical actuator is in most

        * cases relevant only for actuator plugins handling external

        * vibra devices; E.g. connection to the external device may be

        * lost, in which case the plugin is not able to execute incoming

        * commands.

        */

        EHWRMActuatorDisabled, 

        /**

        * For sanity checks only e.g. when enumerating actuator events.

        */ 

        EHWRMEventLast    

        };

    /**

    * Called when the state of an actuator changes. 

    * 

    * @param aEvent Indicates the type of event.

    * @param aActuator Logical actuator to which the event happened.

    *

    * @since S60 5.1

    */

    virtual void ActuatorEventL( THWRMActuatorEvents aEvent, 

                                 THWRMLogicalActuators aActuator ) = 0;

    };

#endif // M_HWRMHAPTICSACTUATOROBSERVER_H