/*

* Copyright (c) 2007 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:  Updates applications and icons in Operator Tile.

*

*/

#ifndef __HSDATAOBSERVER_H__

#define __HSDATAOBSERVER_H__

#include <string>

namespace Hs {

/**

 * An observer interface. 

 * Client must implement it to be able to get information

 * about occuring Execute actions from the Homescreen Publishing API.

 *

 * @code

 * class ObserverClass : public IHsDataObserver

 * {

 *      void handleEvent( std::string aWidgetName, 

 *			IHsDataObserver::EEvent aEvent)

 *      {

 *      }

 * 

 *      void handleItemEvent( std::string aWidgetName,

 *        	std::string aWidgetItemName,

 *       	IHsDataObserver::EItemEvent aEvent)

 *      {

 *      }

 * }

 * ObserverClass* dataObserver = new ObserverClass();

 * HsWidgetPublisher* hsPublisher = new HsWidgetPublisher( dataObserver );

 * @endcode

 */

class IHsDataObserver

    {

public:

	/**

	 * Defines the events that may take place for a homescreen widget.

	 */

	enum EEvent

	    {

	    EUnknown    = 0, ///< Unknown event: Means that event has not been defined.

	    EActivate   = 1, ///< Activation event: Means that widget has been added to HS as content.

	    EDeactivate = 2, ///< Deactivation event: Means that widget has been removed frm.

	    ESuspend    = 3, ///< Suspension event: Means that HS reading widget data is suspended.

	    EResume     = 4  ///< Resume event. Means that HS reading widget data is resumed.

	    };

	/**

	 * Defines the events that may take place for a homescreen widget item.

	 */

	enum EItemEvent

	    {

	    EUnknownItemEvent = 0, ///< Unknown event: Means that event has note been defined.

	    ESelect           = 1  ///< Selection event: Means that the widget item has been selected.

	    };

public:

	/**

	 * Intended to handle an event that occured on a widget.

	 * This would include EActivate, EDeactivate, ESuspend, EReusume.

	 *

	 * @param aWidgetName Name of the widget that event is envoked for.

	 * @param aEvent Event type that has taken place.

	 */

	virtual void handleEvent( std::string aWidgetName, 

			IHsDataObserver::EEvent aEvent) = 0;

	/**

	 * Intended to handle an event that occured on a widget's item.

	 * This would include ESelection.

	 *

	 * @param aWidgetName Name of the widget that event is envoked for.

	 * @param awidgetItemName Name of the item that event is envoked for.

	 * @param aAEvent Event type that has taken place

	 */    

	virtual void handleItemEvent( std::string aWidgetName,

			std::string aWidgetItemName,

			IHsDataObserver::EItemEvent aEvent) = 0;

    };

}

#endif /*__HSDATAOBSERVER_H__*/