/*

* Copyright (c) 2008-2009 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:    Back commmand handler

*

*/

#include "glxcommandhandlerback.h"

#include <avkon.hrh>

#include <data_caging_path_literals.hrh>

#include <apgtask.h>

#include <apgcli.h>

#include <mpxcollectionutility.h>

#include <mpxviewutility.h>			// For MMPXViewUtility

#include <glxcommandhandlers.hrh>

#include <glxpanic.h>

#include <glxtracer.h>

#include <glxlog.h>

#include <glxnavigationalstate.h>

#include <glxcollectionplugincamera.hrh>

#include <glxcollectionplugindownloads.hrh>

#include <glxcollectionpluginalbums.hrh>

#include <glxcollectionpluginmonths.hrh>

#include <glxcollectionplugintags.hrh>

#include <glxcollectionpluginimageviewer.hrh>

#include <glxgallery.hrh>

#include "glxmediaselectionpopup.h"

//constants

// ---------------------------------------------------------------------------

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

EXPORT_C CGlxCommandHandlerBack* 

			CGlxCommandHandlerBack::NewBackCommandHandlerL()

	{

	return CGlxCommandHandlerBack::NewL(EGlxCmdBack,NULL,0);

	}																	

// ---------------------------------------------------------------------------

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

EXPORT_C CGlxCommandHandlerBack* 

			CGlxCommandHandlerBack::NewPreviousViewCommandHandlerL( 	

			MGlxMediaListProvider* aMediaListProvider )

	{

	return CGlxCommandHandlerBack::NewL(EGlxCmdPreviousView,aMediaListProvider,0);

	}

// ---------------------------------------------------------------------------

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

EXPORT_C CGlxCommandHandlerBack* 

			CGlxCommandHandlerBack::NewContainerPreviousViewCommandHandlerL( 	

			MGlxMediaListProvider* aMediaListProvider, TInt aPrevViewId )

	{

	return CGlxCommandHandlerBack::NewL(EGlxCmdContainerPreviousView,

			aMediaListProvider,aPrevViewId);

	}																	

// ---------------------------------------------------------------------------

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

CGlxCommandHandlerBack* 

			CGlxCommandHandlerBack::NewL( 

			TInt aCommandId, MGlxMediaListProvider* aMediaListProvider,

			TInt aPrevViewId )

	{

	CGlxCommandHandlerBack* self = new (ELeave)

	    CGlxCommandHandlerBack(aMediaListProvider,aPrevViewId);

	CleanupStack::PushL(self);

	self->ConstructL(aCommandId);

	CleanupStack::Pop(self);

	return self;

	}

// ---------------------------------------------------------------------------

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

// might leave.

// ---------------------------------------------------------------------------

//	

CGlxCommandHandlerBack::CGlxCommandHandlerBack( MGlxMediaListProvider*

    aMediaListProvider, TInt aPrevViewId )

	{

	iMediaListProvider = aMediaListProvider;

	iPrevViewId = aPrevViewId;

	}			

// ---------------------------------------------------------------------------

// Symbian 2nd phase constructor can leave.

// ---------------------------------------------------------------------------

//	

void CGlxCommandHandlerBack::ConstructL( TInt aCommandId )

	{

    TRACER( "CGlxCommandHandlerBack::ConstructL" );

    GLX_LOG_INFO1( "CGlxCommandHandlerBack::ConstructL::Command Id (%d)",

        aCommandId );

    iCurrentCommandId = aCommandId;

    iNavigationalState =  CGlxNavigationalState::InstanceL();

    iIsViewActivated = EFalse;

    iAppUi = static_cast< CAknAppUi* >( CCoeEnv::Static()->AppUi() );

	}	

// ---------------------------------------------------------------------------

// Destructor

// ---------------------------------------------------------------------------

//

EXPORT_C CGlxCommandHandlerBack::~CGlxCommandHandlerBack()

	{

	TRACER( "CGlxCommandHandlerBack::~CGlxCommandHandlerBack" );

	iNavigationalState->Close();

	}

// -----------------------------------------------------------------------------

// ExecuteL

// -----------------------------------------------------------------------------

//	

TBool CGlxCommandHandlerBack::ExecuteL( TInt aCommandId )

	{

    TRACER("CGlxCommandHandlerBack::ExecuteL");

	TBool consume(EFalse);

	GLX_LOG_INFO1( "CGlxCommandHandlerBack::ExecuteL::Command Id (%d)",

	    aCommandId );

	if(EAknSoftkeyClose == aCommandId)

		{

        GLX_LOG_INFO("CGlxCommandHandlerBack::ExecuteL::go to \

	                    root in UI hierarchy");

        CMPXCollectionPath* newState = CMPXCollectionPath::NewL();

        CleanupStack::PushL( newState );

        iNavigationalState->NavigateToL( *newState );

        CleanupStack::PopAndDestroy( newState );

		consume = ETrue;

		}   

	else if ( aCommandId == EAknSoftkeyBack )

    	{

    	switch( iCurrentCommandId )

    		{

    		case EGlxCmdBack:

    			{

    			GLX_LOG_INFO("CGlxCommandHandlerBack::ExecuteL::One step \

    			    back in UI hierarchy");

                MMPXCollectionUtility* collectionUtility = MMPXCollectionUtility::NewL(NULL, KMcModeDefault);

                CleanupClosePushL(*collectionUtility);

                CMPXCollectionPath* navigationalState = collectionUtility->Collection().PathL();

                CleanupStack::PopAndDestroy(collectionUtility);

                CleanupStack::PushL(navigationalState);

                // let Back Stepping Service handle the event

                if((2 == navigationalState->Levels()||

                		iNavigationalState->StartingLevel() == navigationalState->Levels()-1)

                		&&  iNavigationalState->BackExitStatus())

                    {

                    if(iAppUi)

                        {

                        iAppUi->ProcessCommandL(EAknSoftkeyExit);    

                        }

                    }

                else if( iIsViewActivated )

                    {

                    iIsViewActivated = EFalse;

                    iNavigationalState->NavigateToParentL();  

                    }

                CleanupStack::PopAndDestroy(navigationalState); 

    			consume = ETrue;

    			break;

    			}

    		case EGlxCmdPreviousView:

    		    {

    		    GLX_LOG_INFO("CGlxCommandHandlerBack::ExecuteL::Go back \

    		    to the previous view");

    		    CMPXCollectionPath* path = iNavigationalState->StateLC();

    		    if (path->Id() == TMPXItemId(KGlxCollectionPluginImageViewerImplementationUid))

    		        {

    		        if(iAppUi)

    		            {

    		            iAppUi->ProcessCommandL(EAknSoftkeyExit);    

    		            }

    		        }

    		    else

    		        {

    		        if( iIsViewActivated )

    		            {

    		            iIsViewActivated = EFalse;

    		            iNavigationalState->ActivatePreviousViewL();

    		            }

    		        }

    		    CleanupStack::PopAndDestroy( path );

    		    consume = ETrue;

    		    break;

    		    }

    		case EGlxCmdContainerPreviousView:

    			{

    			GLX_LOG_INFO("CGlxCommandHandlerBack::ExecuteL::Go back \

    			    to the previous view when continer is still there else go two views back");

                // The code commented is to be removed after testing with migrated code is over

                // below code is no longer  expected to be required  as the 

                // "deletion of tags" from tag manager test case dont exist in rel 8.0

                // the private API CheckContainerDeletion()can also to be removed 

    		/*	// check if special case of container deletion need to be checked

    			// this must be done before the previous view is activated as the check

    			// is based on the view id

    			TBool containerDeleted = CheckContainerDeletion();

    			//go back one view

                 if ( iViewUtility->ViewHistoryDepth() > 1 )

                     {

                     iViewUtility->ActivatePreviousViewL();

                     }

    			if( containerDeleted )

    				{

    				//path to get list of containers

    				CMPXCollectionPath* containerPath = iMediaListProvider->MediaList().PathLC();

                    //current navigational state

                    CMPXCollectionPath* navigationalState = iCollectionUtility->Collection().PathL();

                    CleanupStack::PushL(navigationalState);

    				//current node id in UI Hierarchy

    				TMPXItemId currentNodeId = navigationalState->Id(navigationalState->Levels() - 2);

    				//check if current node is present in containers list

    				if(KErrNotFound == containerPath->IndexOfId(currentNodeId))

    					{

    					iCollectionUtility->Collection().BackL();

    					}

                    CleanupStack::PopAndDestroy(navigationalState);

    				CleanupStack::PopAndDestroy(containerPath);

    				}*/

    			consume = ETrue;

    			break;

    			}

    		default:

    		    User::Leave( KErrNotFound );

    		    break;

    		}

    	}

	return consume;

	}

//The below commented code to be removed 

// -----------------------------------------------------------------------------

// CheckContainerDeletion

// -----------------------------------------------------------------------------

//

/*TBool CGlxCommandHandlerBack::CheckContainerDeletion() const

	{

	return((iViewUtility->PreviousViewType().operator != (TUid::Uid(0))) && 

		(iViewUtility->PreviousViewType().operator ==(TUid::Uid(iPrevViewId))));

	}*/

// -----------------------------------------------------------------------------

// DynInitMenuPaneL

// -----------------------------------------------------------------------------

//

void CGlxCommandHandlerBack::DynInitMenuPaneL(TInt /*aResourceId*/, 

	{

	// Do Nothing		

	}

// -----------------------------------------------------------------------------

// DoActivateL

// -----------------------------------------------------------------------------

//

void CGlxCommandHandlerBack::DoActivateL(TInt /*aViewId*/)

	{

	iIsViewActivated = ETrue;

	}

// -----------------------------------------------------------------------------

// Deactivate

// -----------------------------------------------------------------------------

//

void CGlxCommandHandlerBack::Deactivate()

	{

	iIsViewActivated = EFalse;

	}

// -----------------------------------------------------------------------------

// OfferKeyEventL

// -----------------------------------------------------------------------------

//

TKeyResponse CGlxCommandHandlerBack::OfferKeyEventL(const TKeyEvent& /*aKeyEvent*/, 

														TEventCode /*aType*/)

	{

	return EKeyWasNotConsumed;		

	}

// -----------------------------------------------------------------------------

// PreDynInitMenuPaneL

// -----------------------------------------------------------------------------

//

void CGlxCommandHandlerBack::PreDynInitMenuPaneL( TInt /*aResourceId*/ )

	{

	// Do Nothing		

	}

//End of file