/*

* Copyright (c) 2007-2010 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 CCamBatteryPaneController class.

*

*/

#ifndef CAMBATTERYPANECONTROLLER_H

#define CAMBATTERYPANECONTROLLER_H

// INCLUDES

#include <e32base.h>

#include "CamPropertyObserver.h" // MPropertyObserver

// CONSTANTS

// Battery strength and animation timer constants.

const TInt KMinBatteryStrength      = 0;

const TInt KMaxBatteryStrength      = 7;

const TInt KBatteryRechargeTick     = 500000;

// FORWARD DECLARATIONS

class CCamBatteryPaneDrawer;

class CCamPropertyWatcher;

class CWindowGc;

class CBitmapContext;

// CLASS DECLARATION

/**

* Abstract API for battery pane observer.

* Derived classes, which have subscribed to CCamBatteryPaneController

* receive notification when the battery pane contents change

*/

class MCamBatteryPaneObserver

    {

    public:    

        /**

        * The battery pane contents have changed

        */

        virtual void BatteryPaneUpdated() = 0;

    };   

/**

* Watches changes in battery strength and charge properties and provides

* animation of recharging. Notifies observer of changes in the battery pane.

* Handles drawing requests by passing them to owned CCamBatteryPaneDrawer

* object.

*/

class CCamBatteryPaneController: public CBase, public MPropertyObserver

    {

    public: // Construction and destruction

        /**

        * Descructor

        */

        ~CCamBatteryPaneController();

        /**

        * Two-phased constructor

        * @param aObserver              Battery pane observer

        * @param aCallbackActive        Callback to the observer active

        * @return Pointer to the created 

        */

        static CCamBatteryPaneController* NewL(

                MCamBatteryPaneObserver& aObserver,

                TBool aCallbackActive );

    public: // From MPropertyObserver

        /**

        * The value of a watched property has changed

        * @param aCategory The category of the property

        * @param aKey the Identifier of the property

        */    

        void HandlePropertyChangedL( const TUid& aCategory, const TUint aKey );

    public: // New functions

        /**

        * Pause battery pane controller. With value ETrue, stops listening

        * to battery pane events, with EFalse reinitializes and starts

        * listening to the events again.

        */

        void Pause( TBool aPause );        

        /**

        * Activate or deactivate callbacks to observer when there

        * are changes in the battery pane.

        * @param aActive Callback to observer active

        */          

        void SetCallbackActive( TBool aActive );

        /**

        * Set location in the screen, where the battery pane is

        * to be drawn.

        * @param aLocation Drawing location

        */        

        void SetLocation( TPoint aLocation );

        /**

        * Set battery strength.

        * @param aStrength Battery strength

        */

        void SetBatteryStrength( TInt aStrength );

        /**

        * Start the recharging animation

        */        

        void StartRecharging();        

        /**

        * Stop the recharging animation

        */  

        void StopRecharging();

        /**

        * Get battery pane's rectangle

        * @return rectangle

        */

        TRect Rect() const; 

        /**

        * Get rectangle of the animated part of battery pane

        * @return rectangle

        */

        TRect AnimationRect() const;                 

        /**

        * Draw the battery pane

        * @param aGc Graphics context

        */                 

        void Draw( CBitmapContext& aGc ) const;

        //void Draw( CWindowGc& aGc ) const;

        /**

        * Handle resource change event

        * @param aType Type of the resource change

        */

        void HandleResourceChange( TInt aType );        

        /**

         * Checks if battery level is low.

         * @return ETrue if battery level is low and

         * charger is not connected

         */

        TBool IsBatteryLow();

    protected:

        /**

        * Second phase constructor

        */

        void ConstructL();

    private:

        /**

        * Constructor.

        * @param aObserver Battery pane observer

        * @param aCallbackActive Callback to the observer active

        */

        CCamBatteryPaneController(

            MCamBatteryPaneObserver& aObserver,

            TBool aCallbackActive );

        /**

        * 

        * @param aThis Pointer to the object owning the ticker

        */

        static TInt TickerCallback( TAny* aThis );        

        /**

        * Changes the (charging) battery strenght value as needed to show the next

        * frame of the animation.

        */

        void UpdateRechargeBatteryStrength();

        /**

        * Notifies observer of changes in the battery pane,

        * if iCallbackActive is set

        */

        void NotifyObserver();

        /**

        * Read current status of the properties. Set battery level

        * and start/stop battery recharging animation accordingly.

        */

        void ReadCurrentState();

        /**

        * Start/stop the charging animation, depending on aStatus value

        * @param aStatus Value of the charging status property

        */

        void HandleChargingStatusChange( TInt aStatus );

    private:            

        // Current battery strength

        TInt                        iBatteryStrength;

        // Recharging animation status

        TBool                       iRecharging;

        TInt                        iRechargeBatteryStrength;

        // Object that handles the actual drawing

        CCamBatteryPaneDrawer*      iDrawer;

        // Recharge animation timer

        CPeriodic*                  iTicker;

        // Observer of the battery pane changes

        MCamBatteryPaneObserver&    iObserver;

        TBool                       iCallbackActive;

        // Property watchers for battery charging and strength

        CCamPropertyWatcher*        iBatteryStrengthWatcher;

        CCamPropertyWatcher*        iBatteryChargingWatcher;

        TBool                       iPaused;

    };

#endif