musichomescreen/mcpmusicplayer/src/pnsmonitor.cpp
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     1 /*
       
     2 * Copyright (c) 2008-2008 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:  Monitors the file system for changes in a file.
       
    15 *
       
    16 */
       
    17 
       
    18 
       
    19 #include <mpxlog.h>
       
    20 #include <mpxconstants.h>
       
    21 
       
    22 #include "pnsmonitor.h"
       
    23 #include "pnsmonitorobserver.h"
       
    24 
       
    25 // RProperty key to identify the case when Music Player launching
       
    26 // in the background
       
    27 const TInt KMPXLaunchingOnBackground( 100 );
       
    28 
       
    29 // ---------------------------------------------------------------------------
       
    30 // Constructor
       
    31 // ---------------------------------------------------------------------------
       
    32 //
       
    33 CPNSMonitor::CPNSMonitor( MPNSMonitorObserver& aObserver )
       
    34         : CActive( CActive::EPriorityLow ),
       
    35         iObserver( aObserver )
       
    36     {
       
    37     }
       
    38 
       
    39 // ---------------------------------------------------------------------------
       
    40 // Second Phase Constructor
       
    41 // ---------------------------------------------------------------------------
       
    42 //
       
    43 void CPNSMonitor::ConstructL()
       
    44     {
       
    45     User::LeaveIfError( iPropertyHandler.Attach( KAppUidMusicPlayerX,
       
    46             KMPXLaunchingOnBackground ) );
       
    47     CActiveScheduler::Add( this );
       
    48     }
       
    49 
       
    50 // ---------------------------------------------------------------------------
       
    51 // Two-phased constructor
       
    52 // ---------------------------------------------------------------------------
       
    53 //
       
    54 CPNSMonitor* CPNSMonitor::NewL( MPNSMonitorObserver& aObserver )
       
    55     {
       
    56     CPNSMonitor* self = new( ELeave ) CPNSMonitor( aObserver );
       
    57     CleanupStack::PushL( self );
       
    58     self->ConstructL();
       
    59     CleanupStack::Pop( self );
       
    60     return self;
       
    61     }
       
    62 
       
    63 // ---------------------------------------------------------------------------
       
    64 // Destructor
       
    65 // ---------------------------------------------------------------------------
       
    66 //
       
    67 CPNSMonitor::~CPNSMonitor()
       
    68     {
       
    69     Cancel();
       
    70     iPropertyHandler.Close();
       
    71     }
       
    72 
       
    73 // ---------------------------------------------------------------------------
       
    74 // Starts monitoring
       
    75 // ---------------------------------------------------------------------------
       
    76 //
       
    77 void CPNSMonitor::Start()
       
    78     {
       
    79     MPX_DEBUG1("CPNSMonitor::Start <---");
       
    80     iPropertyHandler.Subscribe( iStatus );
       
    81     SetActive();
       
    82     MPX_DEBUG1("CPNSMonitor::Start --->");
       
    83     }
       
    84 
       
    85 // ---------------------------------------------------------------------------
       
    86 // RunL callback
       
    87 // ---------------------------------------------------------------------------
       
    88 //
       
    89 void CPNSMonitor::RunL()
       
    90     {
       
    91     MPX_DEBUG1("CPNSMonitor::RunL <---");
       
    92     TInt ret( 0 );
       
    93     TInt err = RProperty::Get( KAppUidMusicPlayerX,
       
    94                 KMPXLaunchingOnBackground,
       
    95                 ret );
       
    96 
       
    97     if ( ret )
       
    98         {
       
    99         iObserver.OpeningMusicPlayer();
       
   100         MPX_DEBUG1("CPNSMonitor::RunL - Opening Music Player on the background");
       
   101         }
       
   102     
       
   103 	// Listen again
       
   104     Start();
       
   105     
       
   106     MPX_DEBUG1("CPNSMonitor::RunL --->");
       
   107     }
       
   108 
       
   109 // ---------------------------------------------------------------------------
       
   110 // Handle Cancelling
       
   111 // ---------------------------------------------------------------------------
       
   112 //
       
   113 void CPNSMonitor::DoCancel()
       
   114     {
       
   115     MPX_DEBUG1("CPNSMonitor::DoCancel <---");
       
   116     // Stop monitoring
       
   117     iPropertyHandler.Cancel();
       
   118     MPX_DEBUG1("CPNSMonitor::DoCancel --->");
       
   119     }
       
   120 
       
   121 // ----------------------------------------------------------------------------
       
   122 // Handles a leave occurring in the request completion event handler RunL()
       
   123 // ----------------------------------------------------------------------------
       
   124 //
       
   125 TInt CPNSMonitor::RunError( TInt aError )
       
   126     {
       
   127     MPX_DEBUG2("CPNSMonitor::RunError(%d)", aError );
       
   128    
       
   129     // Listen again
       
   130     Start();
       
   131     return KErrNone;
       
   132     }