/*

* Copyright (c) 2008-2009 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:    Class definition that monitors tv window visibility

*

*/

#ifndef __GLXWINVISIBILITYMONITOR_H__

#define __GLXWINVISIBILITYMONITOR_H__

// External Includes

#include <e32base.h>                // for CBase

#include <AknWsEventObserver.h>     // for MAknWsEventObserver

// Forward Declarations

class MGlxWindowVisibilityObserver;       

/**

 * Class Description

 * An Active object derived class is used to monitor the visibility of the

 * TV out window.

 */        

NONSHARABLE_CLASS(CGlxWindowVisibilityMonitor) : public CBase, 

                                                 public MAknWsEventObserver

    {

public:

    /**

     * Static Symbian 2 stage constructor.

     */

    static CGlxWindowVisibilityMonitor* NewL(

                            MGlxWindowVisibilityObserver& aVisibilityObserver );

    /**

     * Destructor.

     */

    ~CGlxWindowVisibilityMonitor();

    /**

     * Close.

     */

    void Close();

private:

    /**

     * Standard C++ constructor

     */

    CGlxWindowVisibilityMonitor( 

                        MGlxWindowVisibilityObserver& aVisibilityObserver );

    /*

     * Symbian second stage construction

     */

    void ConstructL(); 

public: /// class member functions

    /**

     * Provides the caller with the current visible state

     * @return ETrue if the window is visible or false otherwise

     */

    TBool IsVisible() const;

public: // from MAknWsEventObserver

    void HandleWsEventL( const TWsEvent& aEvent, CCoeControl* aDestination );     

private: /// class member data

    /// Not ownded: The Akn event monitor

    CAknWsEventMonitor* iAknEventMonitor;

    /// Not owned: Window visibility observer

    MGlxWindowVisibilityObserver& iVisibilityObserver;

    /// The visible state 

    TBool iIsVisible; 

    };

#endif //  __GLXWINVISIBILITYMONITOR_H__