/*

* Copyright (c) 2004-2008 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:  Header file for CIRSystemEventDetector.

*

*/

#ifndef IRSYSTEMEVENTDETECTOR_H

#define IRSYSTEMEVENTDETECTOR_H

#include <e32base.h>

#include "irpropertyobserver2.h"

class MIRSystemEventDetectorObserver;

/**

* Catches notification of the call and network state changes.

*

* Class provides implementation to detect system events and notify UI components of the event,

* Class keeps several instances of CVPropertyObserver, and those instances send event notifications 

* about the particular system component state change. 

*/

NONSHARABLE_CLASS( CIRSystemEventDetector ) : public CBase, public MIRPropertyChangeObserver2

    {

    public:

        /**

        * Two-phased constructor.

        * @param aObserver a reference to the observer interface implementer

        */

        static CIRSystemEventDetector* NewL(MIRSystemEventDetectorObserver&  aObserver);

        /**

        * Destructor.

        */

        virtual ~CIRSystemEventDetector();

		/**

		* Returns network coverage state (wlan or mobile).

		*/

		TBool IsNetworkCoverage() const;

		/**

		* Returns mobile network coverage state.

		*/

		TBool IsMobileNetworkCoverage() const;

		/**

		* Returns current call state.

		*/

		TBool IsCallActive() const;

		/**

		* Returns current audio resources state.

		* @return audio resources state 

		*/

		TBool IsAudioResourcesAvailable() const;

		/**

		* Returns current Voice UI state.

		* @return ETrue if Voice UI is active, EFalse otherwise

		*/

		TBool IsVoiceUiActive() const;

    protected:

// from base class MIRPropertyChangeObserver2

	    void HandlePropertyChangeL(const TUid& aCategory, const TUint aKey, const TInt aValue);

	    void HandlePropertyChangeL(const TUid& aCategory, const TUint aKey, const TDesC8& aValue);

	    void HandlePropertyChangeL(const TUid& aCategory, const TUint aKey, const TDesC& aValue);

	    void HandlePropertyChangeErrorL(const TUid& aCategory, const TUint aKey, TInt aError);

    private:

        /**

        * By default EPOC constructor is private.

        */

        void ConstructL();

        /**

        * Used internally to change network coverage status and report it to observer.

        **/

        void CIRSystemEventDetector::SetNetworkCoverageL( const TBool aIsMobileNetworkCoverage,

        		 const TBool aIsWlanCoverage );

        /**

        * C++ default constructor.

        * @param aObserver a reference to the observer interface implementer     

        */

        CIRSystemEventDetector(MIRSystemEventDetectorObserver&  aObserver);

	private:    // Data

        /**Observer which will be notified of the call and network state changes*/

		MIRSystemEventDetectorObserver&  iObserver;

        /** handler to Publish & Subscribe interface*/        		

        CIRPropertyObserver2*    iCallStatusObserver;

        /** handler to Publish & Subscribe interface*/        		

        CIRPropertyObserver2*    iNetworkStatusObserver;

        /** handler to Publish & Subscribe interface*/        		

        CIRPropertyObserver2*    iVoiceUiObserver;

        /** handler to Publish & Subscribe interface*/        		

        CIRPropertyObserver2*    iAudioPolicyObserver;

        /** handler to Publish & Subscribe interface*/        		

        CIRPropertyObserver2*    iWlanObserver;

		/**Indicator for the mobile network status*/

		TBool iIsMobileNetworkCoverage;

		/**Indicator for the wlan network status*/

		TBool iIsWlanCoverage;

		/**Indicator for the call status*/

		TBool iIsCallActive;

        /** Array of audio policy categories that VR must not resume after. */

        RArray<TInt> iNoAutoResumeAudioCategories;

        /** Indicator for audio resource status. */

		TBool iIsAudioResourcesAvailable;

		/** Indicator for Voice UI status. */

		TBool iIsVoiceUiActive;

    };

#endif   // IRSYSTEMEVENTDETECTOR_H