/*

* 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:    Handles & propogates UI state change notifications.

*

*/

/**

 * @internal reviewed 24/08/2007 by D Holland

 */

#ifndef __GLXTV_H__

#define __GLXTV_H__

// External Includes

#include <e32def.h>

#include <e32base.h>

// Internal Includes

#include <glxtvconstants.h>

// Forward Declarations

class MGlxTvObserver;

class CGlxWindowVisibilityMonitor;

class CGlxTvConnectionMonitor;

class CRepository;

// For window server visibility notifications 

class MGlxWindowVisibilityObserver

    {

public:

    /**

     * Handle changes to the application window visiblity

     * Called when window visible state changes

     * @param aChangeType The visibility change type

     */

    virtual void HandleWindowVisibilityChangedL( TTvChangeType aChangeType ) = 0;

    };

// For Tv connection notification

class MGlxTvConnectionObserver

    {

public:

    /**

     * Handle TV connection state changes

     */

    virtual void HandleTvConnectionStatusChangedL( ) = 0;

    };

/**

 * Class Description

 * A class that handles and propagates UI change notifications

 * @author Loughlin

 */        

NONSHARABLE_CLASS (CGlxTv) : public CBase,

                             public MGlxWindowVisibilityObserver,

                             public MGlxTvConnectionObserver

    {

public:

    /**

     * Static Symbian 2 stage constructor.

     * @param a TvObserver

     */

    IMPORT_C static CGlxTv* NewL( MGlxTvObserver& aTvObserver );

    /**

     * Destructor.

     */

    IMPORT_C ~CGlxTv();

private:

    /**

     * Standard C++ constructor

     * @param a TvObserver     

     */

    CGlxTv(MGlxTvObserver& aTvObserver);

    /*

     * Symbian second stage construction

     */

    void ConstructL(); 

public: // class public method   

    /**

     * Get the current screen size

     * @return the Screen size in pixels

     */

    IMPORT_C TSize ScreenSizeL() const;

    /**

     * @return ETrue if active, otherwise EFalse

     */

    IMPORT_C TBool IsConnected() const; 

    /**

     * Is the TV widescreen

     * @return ETrue if widescreen, otherwise EFalse

     */

    IMPORT_C TBool IsWidescreen() const; 

public: // from MGlxWindowVisibilityObserver

    /**

     * @ref MGlxWindowVisibilityObserver::HandleWindowVisibilityChangedL

     */

    void HandleWindowVisibilityChangedL( TTvChangeType aChangeType );

public: // from MGlxTvConnectionObserver

    /**

     * @ref MGlxTvConnectionObserver::HandleTvConnectionStatusChangedL

     */

    void HandleTvConnectionStatusChangedL( );

private: // new private methods

    /**

     * Retrive the TV Display Aspect Ratio and TV Setting

     * Calculate the screen size from aspect ratio and TV type

     */    

    void CalcTvScreenSzL();

    /**

     * Start monitoring the environment for changes to the TV aspect ratio

     * and the Gallery window groups visiblity 

     */        

    void MonitorEnvironmentL();

    /**

     * Stop monitoring the environment for changes to the TV aspect ratio

     * and the Gallery window groups visiblity 

     */      

    void StopMonitoringEnvironment();

private: // class member data    

    // Not Owned: The TV out observer 

    MGlxTvObserver& iTvObserver;

    // Owned: The Window visibility monitor

    CGlxWindowVisibilityMonitor* iWindowVisibilityMonitor;

    // Owned: The TV connection monitor

    CGlxTvConnectionMonitor* iTvConnectionMonitor;

    // Size of the TV Out display size

    TSize iSzInPixels;

    // Owned: The central repository where TV display ratio is held.

    CRepository* iCenRep;

     // The implementation of the class, hidden from clients

	class CGlxTvOutCenRepMonitor;

	// Owned: Monitoring class for Tv Ratio Values

	CGlxTvOutCenRepMonitor* iTvDisplayAspectRatioMonitor; 

	// The TV aspect ratio

	TInt iAspectRatio;

    };

#endif // __GLXTV_H__