/*

* Copyright (c) 2007 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:  Communication from Client API to Tactile Area Registry.

* Part of:      Tactile Feedback.

*

*/

#ifndef C_TOUCHFEEDBACKCLIENT_H

#define C_TOUCHFEEDBACKCLIENT_H

#include <e32std.h>

#include <w32std.h>

#include <e32base.h>

#include <coemain.h>

#include <tactilefeedback.h>

#include "touchlogicalfeedback.h"

class CTouchFeedbackImpl;

/**

 *  The class for sharing area registry with the window server.

 *

 *  @lib touchfeedback.lib

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CTouchFeedbackClient ): 

        public CBase

    {

public:

    /**

     * Instantiation method.

     *

     * @since S60 5.0

     * @return New CTouchFeedbackClient instance.

     */

    static CTouchFeedbackClient* NewL( CTouchFeedbackImpl& aFeedback );

    /**

     * Destructor.

     * @since S60 5.0

     */

    virtual ~CTouchFeedbackClient();

    /**

     * Should be called whenever registry has changed.

     *

     * Causes starting of a CIdle object, so that registry updates are

     * flushed to server side as soon as possible.

     * @since S60 5.0     

     */

    void RegistryChanged( );

    /**

     * Use to produce direct feedback immediately.

     *

     * @since S60 5.0     

     * @param aType    - The logical feedback type.

     * @param aVibraOn - If ETrue then vibra feedback shall be played

     *                   (if enabled in device).

     * @param aAudioOn - If ETrue then audio feedback shall be played

     *                   (if enabled in device).

     */

    void ImmediateFeedback( TTouchLogicalFeedback aType, 

                            TBool aVibraOn, 

                            TBool aAudioOn );

    /**

     * Use to flush registry updates immediately.

     * @since S60 5.0     

     */

    void FlushUpdates();

    /**

     * Starts continuous feedback or just restarts the timeout timer if 

     * feedback is already started. This function can also be used to

     * modify the intensity of ongoing continuous feedback if timeout 

     * and repeated start calls are used. 

     *

     * @since S60 5.2     

     * @param aClientHandle - Handle of a client. Handle is stored to 

     *                        prevent other clients to stop or modify 

     *                        playing feedback.

     * @param aType         - Type of continuous feedback.

     *                   

     * @param aIntensity    - Intensity of continuous feedback. Value

     *                        range is 0-100%.

     * @param aTimeout      - Timeout value, which is used to automatically 

     *                        stop continuous feedback if there's no new 

     *                        start call within the timeout time. 

     */    

    void StartFeedback( TUint32 aClientHandle,

                        TTouchContinuousFeedback aType,

                        TInt aIntensity,

                        TTimeIntervalMicroSeconds32 aTimeout );

    /**

     * Modifies the intensity of continuous feedback.

     *

     * @since S60 5.2     

     * @param aClientHandle - Handle of a client to check if caller started

     *                        the playing continuous feedback. 

     * @param aIntensity    - New intensity of continuous feedback. Value

     *                        range is 0-100%.

     */                            

    void ModifyFeedback( TUint32 aClientHandle,

                         TInt aIntensity );

    /**

     * Stops the continuous feedback.

     *

     * @since S60 5.2     

     * @param aClientHandle - Handle of a client to check if caller started

     *                        the playing continuous feedback. 

     */                                

    void StopFeedback( TUint32 aClientHandle );  

    /**

     * Enables or disables audio or/and vibra feedback in whole device.

     * @param aFeedbackType  - Feedback types to be enabled/disabled 

     *                         defined as a bitmask combination of 

     *                         enumeration items from TTouchFeedbackType.

     *

     * @since S60 5.2     

     * @return KErrNone, or one of standard Symbian OS error codes if

     *         enabling/disabling fails.

     *         KErrPermissionDenied - ECapabilityWriteDeviceData required

     *                                for using this function.

     */    

    TInt SetFeedbackEnabledForDevice( TTouchFeedbackType aFeedbackType );  

    /**

     * Used to check enabled feedback types for the device.

     *

     * @since S60 5.2

     * @return TTouchFeedbackType containing enabled feedback types 

     *         as a bitmask.

     */    

    TTouchFeedbackType FeedbackEnabledForDevice();

private:

    /**

     * Start timeout timer for continuous feedback.

     */

    void StartFeedbackTimer( TTimeIntervalMicroSeconds32 aTimeout );

    /**

     * Stops continuous feedback and clears timeout timer and client handle.

     * Called by timeout callback function.

     */    

    void StopFeedbackByTimeout();

    /**

     * Timeout callback function.

     */

     static TInt StopFeedbackCallback( TAny* aThis );

private:

    /**

     * Default constructor.

     */

    CTouchFeedbackClient( CTouchFeedbackImpl& aFeedback );

    /**

     * 2nd phase constructor.

     */    

    void ConstructL();

    /**

     * Callback for CIdle. When this function is called, it is time to update

     * local registry content to shared memory chunk.

     *

     * Depending of whether feedback is actually enabled or disabled for

     * this application, either UpdateRegistryToChunkL or ClearWholeChunkL

     * -function shall be called.

     *

     * @param aPtr - Pointer to this class instance.

     */

    static TInt IdleCallbackL( TAny* aPtr );

    /**

     * Updates whole area registry content to shared chunk. Called from

     * IdleCallbackL when feedback is enabled for this application.

     */

    void UpdateRegistryToChunkL();

    /**

     * Clears whole shared chunk so that there are no feedback areas at

     * all. Called from IdleCallbackL when feedback is disabled for this

     * application.

     */

    void ClearWholeChunkL();

    /**

     * This is a cleanup operation that releases a semaphore in case

     * a leave occurs while we have called Wait on the semaphore. 

     * Failing to release the semaphore (by calling "Signal" -function

     * on it) would lead to deadlock in the system.

     * @param aPtr - Pointer to RSemaphore.

     */

    static void CleanupSemaphore( TAny* aPtr );

private: // data

    /**

     * Connection to window server click maker plugin.

     */

    RSoundPlugIn iClickPlugin;

    /**

     * Area registry in shared chunk between this process and

     * window server process.

     */

    RChunk iChunk;

    /**

     * Mutual exlusion with window server and other clients.

     */

    RSemaphore iSemaphore;

    /**

     * For knowing if we'll need to disconnect when this application

     * is closed.

     */    

    TBool iConnected;

    /**

     * For doing registry update as soon as possible, but not

     * immediately.

     * Own.  

     */

    CIdle* iIdle;

    /**

     * Access to local area registry

     * Not own.  

     */

    CTouchFeedbackImpl& iFeedback;

    /**

     * Client interface to tactile feedback server.

     * Own.

     */

    RTactileFeedback iFbClient;

    /**

     * Timer for continuous feedback timeout.

     * Own.

     */

    CPeriodic* iFeedbackTimer;

    /**

     * Client handle for checking continuous is not modified or stopped by

     * other clients that the one, which started it.

     */

    TUint32    iClientHandle;

    /**

     * Previous intensity value of an ongoing continuous feedback to prevent

     * unnecessary modify calls if there's no change in intensity. Also

     * new start call for ongoing feedback modifies the intensity if value

     * was changed.

     */

    TInt       iPreviousIntensity;

    };

#endif //  C_TOUCHFEEDBACKCLIENT_H