/*

 * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

 * which accompanies this distribution, and is available

 * at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:  Interface for using area registry and direct feedback from

 *                applications and UI controls.

 *

 */

 #ifndef M_TOUCHFEEDBACK_H

 #define M_TOUCHFEEDBACK_H

 #include <e32std.h>

 #include <e32base.h>

 #include <coemain.h>

 #include <touchlogicalfeedback.h>

 class CCoeControl;

 /**

  *  This is the Tactile Feedback interface for UI Controls.

  *

  *  Provides an interface to add, modify and remove feedback areas

  *  in the registry. There is also an option to trigger direct feedback, 

  *  hence bypassing the registry.

  *

  *  Feedback areas must always be related to some UI Control (derived

  *  from CCoeControl). Areas are distinguished from each other based on

  *  control's address and an index number (so that it is possible

  *  to register and maintain multiple areas for same control).

  *

  *  Clients must add, maintain and remove their feedback areas using this

  *  API according to the state changes of the application / control, and

  *  according to for e.g. device wide layout changes.

  *

  *  There are two cases when tactile framework automatically updates the

  *  feedback areas for control: Feedback is always disabled when control

  *  becomes dimmed and re-enabled when control becomes undimmed again.

  *  If control becomes invisible, then feedback areas are (temporarily)

  *  removed, and they will be automatically added again when control

  *  becomes visible again.

  *

  *  This class is not intended for derivation outside the library.

  *

  *  @lib touchfeedback.lib

  *  @since S60 v5.0

  */

 class MTouchFeedback

     {

 public:

     /**

      * Used for acquiring a pointer to touch feedback instance.

      *

      * Pointer is retrieved from thread local storage, and thus it is best

      * to store the returned pointer as member variable in case it will

      * be needed frequently.

      *

      * NULL is returned in case there is no instance. In that case 

      * CreateInstanceL -function can be used for creating a new instance.

      *

      * @since S60 5.0

      * @return Pointer to touch feedback instance created for this

      *         application process.

      */

     IMPORT_C static MTouchFeedback* Instance();

     /**

      * Creates a new touch feedback instance. The usage of

      * this function should only be necessary from processes which

      * are not GUI applications, but which still have user interface

      * (or want to play direct feedback).

      *

      * DestroyInstance -function must be called for deleting the instance

      * when it is no longer needed.

      *

      * @since S60 5.0

      * @return Pointer to new touch feedback instance.

      */

     IMPORT_C static MTouchFeedback* CreateInstanceL();

     /**

      * Destroys the touch feedback instance and clears pointer in 

      * thread local storage.

      *

      * This function must only be used in case touch feedback has been

      * created with CreateInstanceL -function. I.e. normal GUI applications

      * should never call this function.

      *

      * @since S60 5.0

      */

     IMPORT_C static void DestroyInstance();

     /**

      * This function can be used to check, whether touch feedback is

      * supported at all in the device.

      *

      * All the API functions can be called safely even if touch feedback

      * is not enabled (for e.g. in devices without touch screen). But in

      * some situations registry updates can require complex calculations, 

      * which can be skipped if touch feedback is not enabled at all.

      *

      * Notice that the settings related to touch feedback have no effect

      * on the behavior of this function. I.e. even if user turns touch

      * feedback OFF from settings, this function still returns 

      * ETrue. The reason for this is that registry updates must be done

      * anyway even if the feedback is not on for the moment, because 

      * user can turn it on at anytime, and it is not possible to force

      * an update for all applications in that case.

      *

      * @since S60 5.0

      * @return ETrue if touch feedback is supported in this device.

      */

     virtual TBool TouchFeedbackSupported() = 0;

     /**

      * Used for disabling or enabling feedback in the application.

      *

      * Tactile feedback is enabled by default, and thus standard 

      * S60 components (such as CBA, lists and options menu) automatically 

      * give feedback even if the application itself would make no effort 

      * for producing feedback.

      * 

      * For some applications (such as games) feedback might not be

      * wanted at all. In addition some applications may need to disable

      * feedback in some specific situations. For example: A camera 

      * application may need to disable feedback during video recording,

      * because otherwise feedbacks may cause disturbing sounds that 

      * will be recorded into the video clip.

      *

      * Notice that this function only affects direct feedback and 

      * area registry based feedback for this application. I.e. if this 

      * application is taken to background, other applications can still 

      * produce feedback.

      *

      * Also notice that enabling feedback doesn't still mean that feedback

      * would necessarily be generated, because user may have disabled the

      * feedback for whole device from the settings.

      *

      * @since S60 5.0

      * @param aEnabled - Give ETrue as parameter for enabling feedback, and

      *                   EFalse for disabling feedback.

      */

     virtual void SetFeedbackEnabledForThisApp( TBool aEnabled ) = 0;

     /**

      * Used to check whether feedback is enabled for this application.

      *

      * Notice that this function only returns what was given as parameter

      * to SetFeedbackEnabledForThisApp -function. I.e. this function

      * can return ETrue even if  feedback would be currently disabled

      * from settings.

      *

      * If only vibra or audio feedback is enabled, this function still

      * returns ETrue.

      *

      * @since S60 5.0

      * @return ETrue if feedback is enabled for this application.

      */

     virtual TBool FeedbackEnabledForThisApp() = 0;

     /**

      * Sets or updates rectangular feedback area to registry.

      *

      * If this is new area (i.e. there is not yet area with given control

      * address and area index in the registry), then this area will be 

      * added as the top priority area for its window, i.e. this

      * area will be hit test first when pointer event arrives. 

      *

      * Notice however, that this area will remain as top priority area only

      * until the next new area is added to the registry, or until 

      * MoveFeedbackAreaToFirstPriority -function is called. I.e. new areas

      * are always put on top priority, but they will only remain on top

      * until they will be overridden by next area.

      *

      * The control that is given as parameter should usually be the one

      * that is responsible of handling the pointer events on the 

      * corresponding feedback area.

      *

      * The area can later be identified by passing control pointer and

      * index as parameters to the other functions (for modifying or 

      * removing the feedback area). In case control only

      * registers one area, then index 0 can always be used. Usually most

      * sensible approach is to use indexes 1, 2, 3 etc. for additional 

      * feedback areas, but in practice any desired index values can be

      * used.

      *

      * Notice that if given control is dimmed, then feedback type will

      * be set to "None". If given control is not visible, then feedback

      * area will not be added to registry at all (for now). However, 

      * registry is automatically updated when control's dimming or 

      * visibility changes, so one can call this function also for

      * dimmed and invisible control.

      *

      * When the control given as parameter to this function is destroyed,

      * then the RemoveFeedbackForControl -function must be called while

      * giving the same control as parameter again. This is necessary

      * for removing all the feedback areas, and also for resetting the

      * state information stored by the API implementation.

      *

      * @since S60 5.0

      * @param aControl      - The control handling pointer events on this

                               feedback area.

      * @param aIndex        - The index number of the area to be added.

      * @param aRect         - The feedback area rectangle.

      * @param aFeedbackType - The logical feedback type given

      * @param aEventType    - The pointer event type that triggers the 

      *                        feedback (currently only ETouchEventStylusDown

      *                        is supported).

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

      *         if setting of area to registry failed. 

      *         Some specific error codes:

      *         KErrArgument - A NULL pointer was given as first parameter, or

      *                        the given control does not have any window

      *                        associated to it.

      *         KErrNotSupported - Unsupported logical feedback type or

      *                            event type was given as parameter.

      */

     virtual TInt SetFeedbackArea( const CCoeControl* aControl, 

                                   TUint32 aIndex,

                                   TRect aRect, 

                                   TTouchLogicalFeedback aFeedbackType, 

                                   TTouchEventType aEventType ) = 0;

     /**

      * Removes feedback area from the registry.

      *

      * This function is designed to be used in case feedback areas

      * need to be removed elsewhere than in control's destructor. In 

      * control's destructor RemoveFeedbackForControl -function must be 

      * used instead.

      *

      * @since S60 5.0

      * @param aControl - The control, who has registered the area.

      * @param aIndex   - The index of the area to be removed.

      */

     virtual void RemoveFeedbackArea( const CCoeControl* aControl, 

                                      TUint32 aIndex ) = 0;

     /**

      * Removes all feedback areas of specified control from registry.

      *

      * This function also clears all related data that has been cached

      * by the API implementation, and thus it must always be called from 

      * control's destructor in case control has used any of the following 

      * functions:

      *   - SetFeedbackArea

      *   - EnableFeedbackForControl 

      *

      * Especially notice that it is not enough to remove all feedback areas 

      * individually by using RemoveFeedbackArea -function.

      *

      * The difference between this function and EnableFeedbackForControl

      * -function is that this function really removes all areas related

      * to this control from registry, whereas EnableFeedbackForControl

      * (when EFalse if given as parameter) only temporarily disables 

      * those areas.

      *

      * @since S60 5.0

      * @param aControl - Pointer to the control, whose area registry 

      *                   entries and cached information will be removed.

      */

     virtual void RemoveFeedbackForControl( const CCoeControl* aControl ) = 0;

     /**

      * Changes feedback area in the registry.

      *

      * The area must have been originally added to the registry with 

      * SetFeedbackArea -function, or otherwise this function will

      * do nothing.

      *

      * This function is intended to be used especially in 

      * portrait / landscape changes.

      *

      * If given CCoeControl pointer is NULL, then this function call

      * does nothing.

      *

      * @since S60 5.0

      * @param aControl - The control, who has registered the area.

      * @param aIndex   - The index number of the area, that will be changed.

      * @param aNewRect - New area rectangle for given feedback area.

      */

     virtual void ChangeFeedbackArea( const CCoeControl* aControl, 

                                      TUint32 aIndex, 

                                      TRect aNewRect ) = 0;

     /**

      * Changes feedback type in the registry.

      *

      * Feedback can be temporarily disabled by giving ETouchFeedbackNone

      * as parameter (although using EnableFeedbackForControl function with

      * parameter EFalse is usually better for this functionality).

      *

      * The area must have been originally added to the registry with 

      * SetFeedbackArea -function, or otherwise this function will

      * do nothing.

      *

      * If given control pointer is NULL, then this function call

      * is ignored.

      *

      * @since S60 5.0

      * @param aControl - The control, who has registered the area.

      * @param aIndex   - The index number of the area, that will be changed.

      * @param aNewType - New feedback type for the area.

      */

     virtual void ChangeFeedbackType( const CCoeControl* aControl, 

                                      TUint32 aIndex, 

                                      TTouchLogicalFeedback aNewType ) = 0;

     /**

      * Makes the given feedback area the first priority area in the window

      * where it is located.

      *

      * In practice this means that this will be the first area that is 

      * hit tested when a pointer event arrives.

      *

      * Notice however, that this area will only keep its top priority status

      * until the next area is added to the registry, or until 

      * this function is called again for some other area. I.e. there is no 

      * way for giving any area a permanent status as top priority area

      * (Registry works as a stack, and new items are added on top).

      *

      * If given control pointer is NULL, this function call does nothing.

      *

      * @since S60 5.0

      * @param aControl - The control, who has registered the area.

      * @param aIndex   - The index number of the area, which 

      *                   will be prioritized.

      */

     virtual void MoveFeedbackAreaToFirstPriority( const CCoeControl* aControl, 

                                                   TUint32 aIndex ) = 0;

     /**

      * This function forces all registry changes made on client side to be

      * sent to server side immediately.

      *

      * This operation causes always immediate and synchronous client-server 

      * transaction, and can possibly also cause flushing of window server

      * client side buffer. Hence this function should only be used in case 

      * there is a synchronization problem so that feedback triggered from 

      * area registry does not correspond to the areas defined by application.

      *

      * This function is only likely to help in such situation, where this

      * application's active objects are running all the time for several seconds,

      * because in that case updates won't be transferred to server immediately.

      *

      * Calling this function has no effect in case there are no pending 

      * area registry updates.

      *

      * @since S60 5.0

      */

     virtual void FlushRegistryUpdates( ) = 0;

     /**

      * Gives direct feedback.

      *

      * Notice that the feedback might not be actually played, if 

      * for example user has disabled the feedback from the settings.

      *

      * This function always causes a synchronous client-server transaction, 

      * and potentially flushing of window server client-side buffer.

      *

      * @since S60 5.0

      * @param aType - The logical feedback type to play.

      */

     virtual void InstantFeedback( TTouchLogicalFeedback aType ) = 0;

     /**

      * Gives direct feedback if given control has not disabled it.

      *

      * This function only gives feedback, if EnableFeedbackForControl

      * function has NOT been called on given control with second

      * parameter EFalse.

      * 

      * This overload is recommended when

      * feedback is triggered from UI controls, because then the owner

      * of the control can decide whether both area registry based and

      * direct feedback should be enabled or not.

      *

      * If feedback is enabled for the given control, then this function 

      * causes a synchronous client-server transaction, 

      * and potentially flushing of window server client-side buffer.

      *

      * @since S60 5.0

      * @param aControl - The control, who fishes to play feedback.

      * @param aType    - The logical feedback type to play.

      */

     virtual void InstantFeedback( const CCoeControl* aControl,

                                   TTouchLogicalFeedback aType ) = 0;

     /**

      * Can be used for querying, whether given control has any feedback

      * areas registered.

      *

      * It does not matter whether the areas are disabled or enabled for

      * the moment.

      *

      * Notice that one should not usually call this function, as it

      * is always allowed to call for example RemoveFeedbackArea

      * -function without checking if the area really exists (this

      * is done internally in the API implementation anyway).

      *

      * @since S60 5.0

      * @param aControl - Pointer to the control, whose feedback is

      *                   queried.

      * @return ETrue if the given control has at least one feedback

      *         area defined. EFalse otherwise.

      */

     virtual TBool ControlHasFeedback( const CCoeControl* aControl ) = 0;

     /**

      * Can be used for querying, whether given control has a feedback

      * area defined with given index number.

      *

      * It does not matter whether the areas are disabled or enabled for

      * the moment.

      *

      * Notice that one should not usually call this function, as it

      * is always allowed to call for example RemoveFeedbackArea

      * -function without checking if the area really exists (this

      * is done internally in the API implementation anyway).

      *

      * @since S60 5.0

      * @param aControl - Pointer to the control, whose feedback is

      *                   queried.

      * @param aIndex   - The index number of the area which is queried.

      * @return ETrue if the given control has a feedback area defined

      *         with given index number. EFalse otherwise.

      */

     virtual TBool ControlHasFeedback( const CCoeControl* aControl, 

                                       TUint32 aIndex ) = 0;

     /**

      * This function enables or disables all feedback areas registered for 

      * the given control. Disabling also affects to the overloaded version

      * of InstantFeedback -function, so that feedback is not played if

      * the control given as parameter has its feedback disabled.

      *

      * This function can be used for temporarily disabling

      * the feedback for some given control. Calling with second parameter 

      * ETrue re-enables feedback areas, but it still does not

      * guarantee any feedback (control can be dimmed, invisible, of may not

      * even have any feedback areas registered).

      *

      * This function affects both vibra- and audio feedback.

      *

      * Any control that uses this function must call RemoveFeedbackForControl

      * -function in its destructor.

      *

      * @since S60 5.0

      * @param aControl - Pointer to control, whose feedback will be 

      *                   enabled or disabled according to second parameter.

      * @param aEnable  - Use EFalse for temporary disabling the feedback for

      *                   this control, and ETrue for restoring the situation

      *                   to normal.

      */

     virtual void EnableFeedbackForControl( const CCoeControl* aControl,

                                            TBool aEnable ) = 0;       

     /**

      * This function can be used for separately enabling or disabling audio-

      * and vibra feedback for the given control.

      *

      * Otherwise the function behaves in the same way as the overload with

      * only one TBool parameter.

      *

      * Any control that uses this function must call RemoveFeedbackForControl

      * -function in its destructor.

      *

      * @since S60 5.0

      * @param aControl - Pointer to control, whose audio- and vibra 

      *                   feedback will be enabled or disabled according 

      *                   to given parameters.

      * @param aEnableVibra  - Use EFalse for temporary disabling the vibra 

      *                        feedback for this control, and ETrue for 

      *                        restoring the situation to normal.

      * @param aEnableAudio  - Use EFalse for temporary disabling the audio 

      *                        feedback for this control, and ETrue for 

      *                        restoring the situation to normal.

      */

     virtual void EnableFeedbackForControl( const CCoeControl* aControl,

                                            TBool aEnableVibra,

                                            TBool aEnableAudio ) = 0; 

     /**

      * Used for disabling or enabling feedback in the application.

      *

      * This is identical with the overload which has only one parameter, 

      * with the exception that one can disable audio and vibra feedback 

      * separately with this version.

      *

      * @since S60 5.0

      * @param aVibraEnabled - Give ETrue as parameter for enabling vibra 

      *                        feedback, and EFalse for disabling vibra 

      *                        feedback for this application.

      * @param aAudioEnabled - Give ETrue as parameter for enabling audio 

      *                        feedback, and EFalse for disabling audio

      *                        feedback for this application.

      */

     virtual void SetFeedbackEnabledForThisApp( TBool aVibraEnabled,

                                                TBool aAudioEnabled ) = 0;                                                 

     };

 #endif //  M_TOUCHFEEDBACK_H