/*

* Copyright (c) 2002-2008 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 controlling keysounds from Avkon.

*

*/

#ifndef __AKNSOUNDSYSTEM_H__

#define __AKNSOUNDSYSTEM_H__

// INCLUDES

#include <e32base.h>

#include <w32std.h>

#include <aknsoundinfo.h>

// FORWARD DECLARATIONS

class CAknSoundPlayer;

class CAknKeySoundStack;

// CLASS DECLARATION

/**

*  Interface for controlling keysounds from Avkon.

*  Provides support for handling key sounds.

*  @since S60 0.9

*/

NONSHARABLE_CLASS(CAknKeySoundSystem) : public CBase

    {

public:

    /**

    * Base class default constructor. If a client application is derived from @c CAknAppUi, 

    * its @c KeySounds() method should be used instead to obtain a key sound system instance.

    * If this method is used, the client needs explicitly call @c BringToForeground().

    *

    * @param aUid Application UID.

    * @return A pointer to a new @c CAknKeySoundSystem object.

    */

    IMPORT_C static CAknKeySoundSystem* NewL(TInt aUid);

    /**

    * Destructor.

    */

    IMPORT_C ~CAknKeySoundSystem();

    /**

    * Reads key sound context from resource file and pushes it to the sound stack.

    * All key presses for the application produce sounds as specified in this key sound context.

    * The resource specified must be of the @c AVKON_SKEY_LIST type. There are also some default

    * Avkon contexts available, e.g. @c R_AVKON_DEFAULT_SKEY_LIST and @c R_AVKON_SILENT_SKEY_LIST.

    *

    * @param aResourceId Key sound context resource ID.

    */

    IMPORT_C void PushContextL(TInt aResourceId);

    /**

    * Pops the top context from the key sound stack.

    */

    IMPORT_C void PopContext();

    /**

    * Plays a sound corresponding to the given key event. This is called directly by Avkon,

    * though it can be used in other circumstances in order to play the correct sound

    * associated with certain key presses.

    *

    * @param aKeyEvent The scan code of the key that caused the event.

    */

    IMPORT_C void PlaySound(const TKeyEvent& aKeyEvent);

    /**

    * Plays a sound corresponding to the given sound ID. The ID can be an application specific ID

    * or a system specific ID. System specific IDs are specified in Avkon enum @c TAvkonSystemSID.

    *

    * @param aSid Sound ID to be played.

    */

    IMPORT_C void PlaySound(TInt aSid);

    /**

    * Installs an application specific set of sound IDs. The specified resource ID must be

    * of the type @c AVKON_SOUND_INFO_LIST. The sound IDs contained in the resource are made

    * available for use in sound contexts within this application only. The method can only be

    * used to install a single application sound information list. Calling the method a

    * second time causes the previous sound information list to be replaced. Note also that

    * application specific SIDs should be less than 1000.

    *

    * @param aResourceId Avkon resource ID.

    */

    IMPORT_C void AddAppSoundInfoListL(TInt aResourceId);

    /**

    * This function brings the sounds back to foreground. This function should

    * be called from @c HandleForegroundEventL(). @c HandleForegroundEventL() is

    * implemented in @c CAknAppUi and it is reimplemented in @c CAknViewAppUi.

    * No need to call this function if using the @c KeySounds() method from @c CAknAppUi instead

    * of @c CAknKeySoundSystem::NewL(). In such case @c CAknAppUi calls this method automatically.

    */

    IMPORT_C void BringToForeground();

    /**

    * Stops playing the sound with given ID. Does nothing if a sound matching the ID is

    * not playing.

    *

    * @param aSid Sound ID to stop.

    */

    IMPORT_C void StopSound(TInt aSid);

    /**

    * Locks sound context, which prevents other instances from bringing their sound contexts

    * topmost. Only the first call is effective, i.e. if some other instance has already

    * locked its own context, the function does nothing. This is used in system components,

    * e.g. in key lock where key tones must be disabled while lock is active.

    */

    IMPORT_C void LockContext();

    /**

    * Releases the context lock. After calling this method, all instances can freely modify

    * their sound contexts again. The caller of the method can be some other instance than

    * the instance that locked the context.

    */

    IMPORT_C void ReleaseContext();

    /**

    * Reads sound information from given Avkon sound ID. This method is intended for applications

    * that need Avkon sound definitions for playing sounds with their own audio instances of

    * Multimedia Framework (such applications should not read Avkon resources as the resource

    * format can change without any notice but instead use this method).

    *

    * @since S60 2.0

    * @param aAvkonSid ID for Avkon sound whose information is requested.

    * @param aInfo Sound information will be put in this structure.

    * @return @c KErrNone if succesful, @c KErrNotFound if requested sound ID is not found.

    */

    IMPORT_C TInt RequestSoundInfoL(TInt aAvkonSid, CAknSoundInfo& aInfo);

    /**

    * Returns top context id from the session.

    *

    * @since S60 3.1

    * @return The resource id of the context that is at the top of the sound stack.

    */

    IMPORT_C TInt TopContext();

    /**

    * Disables next matching key sound until next pointer up event.

    *

    * @since S60 5.0

    * @param aScanCode ScanCode of key which sound is disabled.

    */

    void DisableNextKeySound(TInt aScanCode);

private:

    CAknKeySoundSystem();

    void ConstructL(TInt aUid);

private:

    CAknSoundPlayer* iSoundPlayer;

    TInt iSpare;

    };

#endif // __AKNSOUNDSYSTEM_H__

// End of file