/*

* Copyright (c) 2005-2006 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:  Client interface to ask for setting the default application

*

*/

#ifndef C_DEFAULTAPPCLIENT_H

#define C_DEFAULTAPPCLIENT_H

#include <e32def.h>

#include <e32base.h>

#include <AknServerApp.h>

class RDefaultAppService; 

/**

 *  Client API for setting the default application.

 *

 *  This class defines the API that applications should use to trigger the launch of the

 *  Default Application Server, that asks the user to select default applications for those

 *  Service & MIME pairs for which the client application is a candidate.

 *

 *  A client application should first instantiate the service, using eithe NewL() or NewLC()

 *  The client application can check first if the sercive is available in the system (by using 

 *  the ServiceAvailable() function. The client application may also check if there is 

 *  anything to display (if there is any Service & MIME that the client application supports for 

 *  which there is at least another application supporting the pair). If there is no such pair,

 *  then launching the server would display an empty list). This checking is performed using the 

 *  PairsToDisplayL() function. 

 *

 *  After the above checkings are done, the client application can ask the server to change

 *  defaults by calling the ChangeDefaultsL() function. 

 *    

 *

 *  @lib defaultappclient.dll

 *  @since S60 v5.0

 */

class CDefaultAppClient : public CBase 

    {

public:

    /**  flags used to modify the service behaviour */

    enum TFlags

        {

        EFlagNoObserver=1,

        EFlagReserved1=2,

        EFlagReserved2=4

        };

    /**

     * Symbian OS two-phased constructor

     * @return

     */

    IMPORT_C static CDefaultAppClient* NewL(MAknServerAppExitObserver* aObserver);

    /**

     * Symbian OS two-phased constructor

     * @return

     */

    IMPORT_C static CDefaultAppClient* NewLC(MAknServerAppExitObserver* aObserver);

    /**

     * Destructor.

     */

    IMPORT_C virtual ~CDefaultAppClient();

    /**

     * Function to check if a server is present in the system. If the

     * server is present, the subsequent functions should not fail due

     * to server unavailability.

     *

     * @since S60 v5.0

     * @return ETrue or EFalse, depending service/server availability

     */

    IMPORT_C static TBool ServiceAvailable( TInt& aErrorCode );

    /**

     * Function to check the number of Service & MIME pairs the server would display if the 

     * ChangeDefaultsL() would be called. The purpose of this function

     * is to allow the client application not to display an entry for starting the server, in the 

     * Options menu, in case the Server's list of Service & MIME pairs is empty.

     * 

     * Please note that the function may return a higher number than the actual number

     * of pairs, because it does not check for MIMEs with System priority (that would not be 

     * displayed).

     *

     * @since S60 v5.0

     * @return the number of Service & MIME pairs the server would display

     */

    IMPORT_C TInt PairsToDisplayL();

    /**

     * This function launches the server, as a chained application. The client application will not be

     * available to the user until the server does not exit.

     * When the server exits, the client application gains control again. The observer (if specified 

     * during instantiation (NewL) is notified that the server has exited.

     *

     * @since S60 v5.0

     * @param aFlags service flags 

     */

    IMPORT_C void ChangeDefaultsL( TInt aFlags = 0 );

private:

    /**

     * C++ default constructor.

     */

    CDefaultAppClient();

    /**

     * Symbian constructor.

     */

    void ConstructL( MAknServerAppExitObserver* aObserver );

    /**

     * This function finds out the uid of the Default Application Server 

     * (the application registered to handle the DefaultApp service)

     *

     * @since S60 v5.0

     * @param aServerAppUid If parameter is non-NULL, it returns the Uid of the server there

     */

    static void GetServiceParamsL( TUid* aServerAppUid); 

private: // data

    /**

     * The UID of the server application (we discover the server)

     */

    TUid iServerAppUid;

    /**

     * Pointer to the service class.

     * Own.

     */

    RDefaultAppService *iService; 

    /**

     * Pointer to the Observer to call after the operation initiated by

     * ChangeDefaultsAsyncL() has finished.

     * Not Owned.

     */

    MAknServerAppExitObserver* iObserver;

    /**

     * Monitor object that calls the iObserver when the server has exited.

     * Owned.

     */

    CApaServerAppExitMonitor* iMonitor;

    };

#endif // C_DEFAULTAPPCLIENT_H