// Copyright (c) 2000-2009 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:

//

#ifndef __HLPZOOM_H__

#define __HLPZOOM_H__

// System includes

#include <e32std.h>

// Classes referenced

class MGraphicsDeviceMap;

///////////////////////////////////////////////////////////////////////////////////////

// ----> MHlpZoomStateManager (header)

///////////////////////////////////////////////////////////////////////////////////////

class MHlpZoomStateManager

/**

@internalComponent

@released

*/

	{

public: // Zoom state

	enum THlpZoomState

		{

		EHlpZoomStateSmall = -1,

		EHlpZoomStateNormal = 0,

		EHlpZoomStateLarge = 1

		};

public: // From MHlpZoomStateManager

	virtual void SetZoomState(THlpZoomState aState) = 0;

	virtual THlpZoomState ZoomState() const = 0;

public: // From MHlpZoomStateManager

	virtual MGraphicsDeviceMap& ZoomDeviceMap() const = 0;

	virtual TInt ZoomFactorValueForZoomState(THlpZoomState aState) const = 0;

	};

///////////////////////////////////////////////////////////////////////////////////////

// ----> MHlpZoomStateObserver (header)

///////////////////////////////////////////////////////////////////////////////////////

class MHlpZoomStateObserver

/**

@internalComponent

@released

*/

	{

public: // From MHlpZoomStateObserver

	virtual void HandleZoomStateChangedL(MHlpZoomStateManager::THlpZoomState aZoomState) = 0;

	};

///////////////////////////////////////////////////////////////////////////////////////

// ----> MHlpZoomStateChangeNotifier (header)

///////////////////////////////////////////////////////////////////////////////////////

class MHlpZoomStateChangeNotifier : public MHlpZoomStateManager

/**

@internalComponent

@released

*/

	{

public: // From MHlpZoomStateChangeNotifier

	virtual void RegisterForZoomStateChangeNotificationsL(MHlpZoomStateObserver& aObserver) = 0;

	virtual void RegisterForZoomStateChangeNotificationsCancel(MHlpZoomStateObserver& aObserver) = 0;

	};

#endif