/*

* Copyright (c) 2006 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 "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:  Manages list of widget entries.

*

*/

// INCLUDE FILES

#include "WidgetMMCHandler.h"

#include "WidgetRegistry.h"

// CONSTANTS

LOG_NAMES( "widreg", "widrmmc.txt" )

// ============================================================================

// CWidgetMMCHandler::NewL()

// two-phase constructor

//

// @since 3.1

// @param aRegistry - Widget registry for callback.

// @param aFs - file session

// @return pointer to CWidgetMMCHandler

// ============================================================================

//

CWidgetMMCHandler* CWidgetMMCHandler::NewL(

    CWidgetRegistry& aRegistry,

    RFs& aFs )

    {

    CWidgetMMCHandler* self =

        new(ELeave) CWidgetMMCHandler( aRegistry , aFs );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// ============================================================================

// CWidgetMMCHandler::CWidgetMMCHandler()

// C++ default constructor

//

// @since 3.1

// ============================================================================

//

CWidgetMMCHandler::CWidgetMMCHandler( CWidgetRegistry& aRegistry,

                                      RFs& aFs )

    : CActive( CActive::EPriorityStandard ),

      iRegistry( &aRegistry ),

      iFs( aFs ),

      iDriveFlags( 0 )

    {

    CActiveScheduler::Add( this );

    }

// ============================================================================

// CWidgetMMCHandler::ConstructL()

// Symbian default constructor

//

// @since 3.1

// ============================================================================

//

void CWidgetMMCHandler::ConstructL()

    {

    LOG_CONSTRUCTL;

    if ( KErrNone != ScanDrives( iDriveFlags ) )

        {

        iDriveFlags = 0;

        }

    iDeltaDriveFlags = 0;

    iApaAppListNotifier = CApaAppListNotifier::NewL(this,CActive::EPriorityStandard);

    }

// ============================================================================

// CWidgetMMCHandler::~CWidgetMMCHandler()

// destructor

//

// @since 3.1

// ============================================================================

CWidgetMMCHandler::~CWidgetMMCHandler()

    {

    Cancel();

    LOG_DESTRUCT;

    }

// ============================================================================

// CWidgetMMCHandler::Start()

// Start monitoring.

//

// @since 5.0

// ============================================================================

void CWidgetMMCHandler::Start()

    {

    iFs.NotifyChange( ENotifyDisk, iStatus );

    SetActive();

    }

// ============================================================================

// CWidgetMMCHandler::RunL()

// Handle notifications of MMC events.

//

// @since 3.1

// ============================================================================

void CWidgetMMCHandler::RunL()

    {

    LOG_OPEN;

    LOG1( "MMC notification status %d", iStatus.Int() );

	  TInt status = iStatus.Int();

	  // Request the notification before scanning

	  iFs.NotifyChange( ENotifyDisk, iStatus );

    SetActive();

    if ( status == KErrNone )

      {

        TInt driveFlags = 0;

        TInt deltaDriveFlags = 0;

        if ( KErrNone == ScanDrives( driveFlags ) )

          {

            LOG1( " iDriveFlags 0x%x", iDriveFlags );

            LOG1( "  driveFlags 0x%x", driveFlags );

            deltaDriveFlags = iDriveFlags ^ driveFlags;

            iDeltaDriveFlags |= deltaDriveFlags;

            LOG1( " deltaDriveFlags 0x%x", deltaDriveFlags );

            iDriveFlags = driveFlags;

          }

      }

    LOG( "MMC notification done" );

    LOG_CLOSE;

    }

// ============================================================================

// CWidgetMMCHandler::RunError()

// Ignore errors from RunL.

//

// @since 5.0

// ============================================================================

TInt CWidgetMMCHandler::RunError( TInt /* aError */ )

    {

    LOG_CLOSE;

    return KErrNone; // indicates error was handled

    }

// ============================================================================

// CWidgetMMCHandler::DoCancel()

// Cancel the MMC event handler

//

// @since 3.1

// ============================================================================

void CWidgetMMCHandler::DoCancel()

    {

    LOG_CLOSE;

    iFs.NotifyChangeCancel();

    }

/* Scans drives and records a bit flag for those that exist and are

 * suitable for installing widgets to.

 */

TInt CWidgetMMCHandler::ScanDrives( TInt& aDriveFlags )

    {

    LOG_OPEN;

    LOG( "ScanDrives" );

    // List all drives in the system

    TDriveList driveList;

    TInt error = iFs.DriveList( driveList );

    if ( KErrNone == error )

        {

        for ( TInt driveNumber = EDriveY;

              driveNumber >= EDriveA;

              driveNumber-- )

            {

            // The drives that will be filtered out are the same ones that

            // WidgetInstaller filters out in CWidgetUIHandler::SelectDriveL()

            if ( (EDriveD == driveNumber)

                 || !driveList[driveNumber] )

                {

                // EDriveD is a temporary drive usually a RAM disk

                continue;

                }

            TVolumeInfo volInfo;

            if ( iFs.Volume( volInfo, driveNumber ) != KErrNone )

                {

                // volume is not usable (e.g. no media card inserted)

                continue;

                }

            if ( (volInfo.iDrive.iType == EMediaNotPresent) ||

                 (volInfo.iDrive.iType == EMediaRom) ||

                 (volInfo.iDrive.iType == EMediaRemote) ||

                 (volInfo.iDrive.iDriveAtt & KDriveAttRom) ||

                 (volInfo.iDrive.iDriveAtt & KDriveAttSubsted) )

                {

                // not a suitable widget install drive

                continue;

                }

            // found a usable drive

            aDriveFlags |= (1 << driveNumber);

            LOG2( " drive %d, flags 0x%x", driveNumber, aDriveFlags );

            }

        }

    LOG1( "ScanDrives done, error %d", error );

    LOG_CLOSE;

    return error;

    }

void CWidgetMMCHandler::HandleAppListEvent(TInt aEvent)

    {

    TBool dirtyFlag = EFalse;

    TInt parseError = KErrNone;

    if ( iDeltaDriveFlags )

        {

        // Assume usual case and things are consistent

        // and the registry entry file can be parsed and used.

        TRAPD( error, iRegistry->InternalizeL( ETrue,

                                    ETrue,

                                    dirtyFlag,

                                    parseError ) );

        if ( KErrNone == error )

            {

            // internalize consistency enforcement may have altered registry

            if ( dirtyFlag )

                {

                TRAP_IGNORE( iRegistry->ExternalizeL(); );

                }

            }

        iDeltaDriveFlags = 0;

        CWidgetRegistry::NotifyWidgetAltered();

        }

    }