1 /*

     2 * Copyright (c) 2006-2006 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: An observer and I/F class to observe Publish and Subscribe key changes.

    15 *

    16 */

    17 

    18 

    19 

    20 // INCLUDE FILES

    21 #include "pim_trace.h"

    22 #include "PropertyObserver.h"

    23 

    24 

    25 // ============================ MEMBER FUNCTIONS ===============================

    26 

    27 // -----------------------------------------------------------------------------

    28 // CPropertyObserver::CPropertyObserver

    29 // C++ default constructor can NOT contain any code, that

    30 // might leave.

    31 // -----------------------------------------------------------------------------

    32 //

    33 CPropertyObserver::CPropertyObserver(MPropertyChangeHandler& aHandler, TUid aCategory, TUint aKey)

    34 : CActive( CActive::EPriorityStandard ),

    35   iCategory( aCategory ),

    36   iKey( aKey ),

    37   iHandler( aHandler )

    38 {

    39     TRACE_ENTRY_POINT;

    40     TRACE_EXIT_POINT;

    41 }

    42 

    43 // -----------------------------------------------------------------------------

    44 // CPropertyObserver::ConstructL

    45 // Symbian 2nd phase constructor can leave.

    46 // -----------------------------------------------------------------------------

    47 //

    48 void CPropertyObserver::ConstructL(void)

    49 {

    50     TRACE_ENTRY_POINT;

    51     CActiveScheduler::Add( this );

    52 

    53     User::LeaveIfError( iProperty.Attach( iCategory, iKey ) );

    54 

    55     NotifyCurrentValue(); // for initial value

    56 

    57     // Start observing...

    58     Subscribe();

    59     TRACE_EXIT_POINT;

    60 }

    61 

    62 // -----------------------------------------------------------------------------

    63 // CPropertyObserver::NewL

    64 // Two-phased constructor.

    65 // -----------------------------------------------------------------------------

    66 //

    67 CPropertyObserver* CPropertyObserver::NewL(MPropertyChangeHandler& aHandler, TUid aCategory, TUint aKey)

    68 {

    69     TRACE_ENTRY_POINT;

    70     CPropertyObserver* self = new( ELeave )CPropertyObserver( aHandler, aCategory, aKey );

    71     CleanupStack::PushL( self );

    72     self->ConstructL();

    73     CleanupStack::Pop( self );

    74     TRACE_EXIT_POINT;

    75     return self;

    76 }

    77 

    78 // Destructor

    79 CPropertyObserver::~CPropertyObserver()

    80 {

    81     TRACE_ENTRY_POINT;

    82     Deque();

    83     iProperty.Cancel();

    84     iProperty.Close();

    85     TRACE_EXIT_POINT;

    86 }

    87 

    88 // -----------------------------------------------------------------------------

    89 // CPropertyObserver::RunL

    90 // ?implementation_description

    91 // (other items were commented in a header).

    92 // -----------------------------------------------------------------------------

    93 //

    94 void CPropertyObserver::RunL(void)

    95 {

    96     TRACE_ENTRY_POINT;

    97     ASSERT( !(iStatus.Int()) );

    98     if( iStatus.Int() == KErrNone )

    99     {

   100         Subscribe();

   101         NotifyCurrentValue();

   102     }

   103     TRACE_EXIT_POINT;

   104 }

   105 

   106 // -----------------------------------------------------------------------------

   107 // CPropertyObserver::DoCancel

   108 // ?implementation_description

   109 // (other items were commented in a header).

   110 // -----------------------------------------------------------------------------

   111 //

   112 void CPropertyObserver::DoCancel(void)

   113 {

   114     TRACE_ENTRY_POINT;

   115     iProperty.Cancel();

   116     TRACE_EXIT_POINT;

   117 }

   118 

   119 // -----------------------------------------------------------------------------

   120 // CPropertyObserver::Subscribe

   121 // ?implementation_description

   122 // (other items were commented in a header).

   123 // -----------------------------------------------------------------------------

   124 //

   125 void CPropertyObserver::Subscribe(void)

   126 {

   127     TRACE_ENTRY_POINT;

   128     iProperty.Subscribe( iStatus );

   129     SetActive();

   130     TRACE_EXIT_POINT;

   131 }

   132 

   133 // -----------------------------------------------------------------------------

   134 // CPropertyObserver::NotifyCurrentValue

   135 // ?implementation_description

   136 // (other items were commented in a header).

   137 // -----------------------------------------------------------------------------

   138 //

   139 void CPropertyObserver::NotifyCurrentValue(void)

   140 {

   141     TRACE_ENTRY_POINT;

   142     TInt value;

   143 

   144     if( iProperty.Get( iCategory, iKey, value ) == KErrNone )

   145     {

   146         iHandler.HandlePropertyChange( iCategory, iKey, value );

   147     }

   148     TRACE_EXIT_POINT;

   149 }

   150 

   151 

   152 // End of File