/*

* 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 "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:  

*

*/

// INCLUDE FILES

#include "AknAdaptiveSearch.h"

#include <aknsfld.h>

#include <centralrepository.h>      // CenRep for AS

#include <AvkonInternalCRKeys.h>    // CenRep for AS

#include <akntrace.h>               //for trace

// CONSTANTS

const TInt KAknStringBufferSize = 256;

const TInt KLitHyphen('-');

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

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

// CAknAdaptiveSearch::NewL

// Two-phased constructor.

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

//

CAknAdaptiveSearch* CAknAdaptiveSearch::NewL( const TInt aTextLimit, TInt aFieldStyle )

    {

    CAknAdaptiveSearch* self = CAknAdaptiveSearch::NewLC( aTextLimit, aFieldStyle);

    CleanupStack::Pop( self );

    return self;

    }

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

// CAknAdaptiveSearch::NewLC

// Two-phased constructor.

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

//

CAknAdaptiveSearch* CAknAdaptiveSearch::NewLC( const TInt aTextLimit, TInt aFieldStyle )

    {

    CAknAdaptiveSearch* self = new ( ELeave ) CAknAdaptiveSearch ();

    CleanupStack::PushL( self );

    self->ConstructL( aTextLimit, aFieldStyle );

    return self;

    }

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

// CAknAdaptiveSearch::CAknAdaptiveSearch

// C++ default constructor.

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

//

CAknAdaptiveSearch::CAknAdaptiveSearch()     

    : iBlockFlag( EFalse )      

    {    

    }     

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

// CAknAdaptiveSearch::~CAknAdaptiveSearch

// Destructor.

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

//

CAknAdaptiveSearch::~CAknAdaptiveSearch()

    {  

    _AKNTRACE_FUNC_ENTER;

    if ( iAdaptiveSearchGrid )

	    {

	    delete iAdaptiveSearchGrid;	

	    }

	if( iGridChars )

		{

		delete iGridChars;

		iGridChars = NULL;

		}

	iAdaptiveSearchTextObserver = NULL;	

	// Stop listening CenRep.

    if ( iCenRepNotifyHandlerChinese )

    	{

    	iCenRepNotifyHandlerChinese->StopListening();

    	}

    delete iCenRepNotifyHandlerChinese;

    if ( iCenRepNotifyHandlerPRC )

    	{

    	iCenRepNotifyHandlerPRC->StopListening();

    	}

    delete iCenRepNotifyHandlerPRC;

    if ( iCenRepNotifyHandlerTW )

    	{

    	iCenRepNotifyHandlerTW->StopListening();

    	}

    delete iCenRepNotifyHandlerTW;

    if ( iCenRepNotifyHandlerHongkong )

    	{

    	iCenRepNotifyHandlerHongkong->StopListening();

    	}

    delete iCenRepNotifyHandlerHongkong;

    delete iCenRep;    

    _AKNTRACE_FUNC_EXIT;

    }

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

// CAknAdaptiveSearch::ConstructL

// Symbian 2nd phase constructor.

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

//

void CAknAdaptiveSearch::ConstructL( const TInt aTextLimit, TInt aSearchField )

    {

    _AKNTRACE_FUNC_ENTER;

    iAdaptiveSearchGrid = CAknAdaptiveSearchGrid::NewL( aTextLimit, aSearchField );  

    iAdaptiveSearchGrid->SetAdaptiveSearchGridObserver( this );

    iGridChars = NULL;

    iTextLimit = aTextLimit;

    iAdaptiveSearchTextObserver = NULL;  

    // Start listening a CenRep key indicating input language 

    TRAPD( err, iCenRep = CRepository::NewL( KCRUidAvkon ) );

    if ( err == KErrNone )

        {

        iCenRepNotifyHandlerChinese = CCenRepNotifyHandler::NewL( *this, *iCenRep,

                                      CCenRepNotifyHandler::EIntKey,

                                      KAknAdaptiveSearchLastChinese );

        iCenRepNotifyHandlerChinese->StartListeningL(); 

        iCenRepNotifyHandlerPRC = CCenRepNotifyHandler::NewL( *this, *iCenRep,

                                  CCenRepNotifyHandler::EIntKey,

                                  KAknAdaptiveSearchChinesePRC );

        iCenRepNotifyHandlerPRC->StartListeningL(); 

        iCenRepNotifyHandlerTW = CCenRepNotifyHandler::NewL( *this, *iCenRep,

                                 CCenRepNotifyHandler::EIntKey,

                                 KAknAdaptiveSearchChineseTW);

        iCenRepNotifyHandlerTW->StartListeningL();

        iCenRepNotifyHandlerHongkong = CCenRepNotifyHandler::NewL( *this, *iCenRep,

                                       CCenRepNotifyHandler::EIntKey,

                                       KAknAdaptiveSearchChineseHongkong );

        iCenRepNotifyHandlerHongkong->StartListeningL(); 

        }  

    _AKNTRACE_FUNC_EXIT;

    }

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

// CAknAdaptiveSearch::HandleControlEventL

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

//

void CAknAdaptiveSearch::HandleControlEventL( CCoeControl */*aControl*/, 

                                              TCoeEvent /*aEventType*/ )

	{	

	}

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

// For Devanagari AS

// Checks if the last character entered is a Indic halant character.

// @param aCh - character to be checked  

// @return ETrue if this is a halant character EFalse otherwise.                        

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

inline TBool IsIndicHalantChar( const TChar aCh )

    {

    //Devanagari halant character check:

    return ( aCh == 0x094D );

    }	

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

// CAknAdaptiveSearch::SetButtonCharsL

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

//

void CAknAdaptiveSearch::SetButtonCharsL( const TDesC& aGridChars )

    {  

    _AKNTRACE_FUNC_ENTER;

    _AKNDEBUG(

            _LIT( KClassName, "CAknAdaptiveSearch" );

            _LIT( KFunctionName, "SetButtonCharsL" );

            _LIT( KFormat, "[%S][%S] The text is: %S");

            _AKNTRACE( KFormat, 

            &KClassName, &KFunctionName, &aGridChars );

            );

	if( iGridChars )

		{

		delete iGridChars;

		iGridChars = NULL;

		}   

    TBuf<KAknStringBufferSize> criteria;

    iSearchField->GetSearchText( criteria );

    TInt length = criteria.Length();   

	if( !iTextLimit || length < iTextLimit )

	    {

	    iGridChars = HBufC::NewL( aGridChars.Length() );

	    iGridChars->Des().Copy( aGridChars );	

	    iAdaptiveSearchGrid->SetButtonGridChars( aGridChars );	

        // To do lower case for search pane

        iGridChars->Des().LowerCase();          

        iBlockFlag = EFalse;   	

	    }

	else

	    {	    

	    TPtrC nullText( KNullDesC );

	    iAdaptiveSearchGrid->SetButtonGridChars( nullText );

	    iBlockFlag = EFalse;   		

	    }

	_AKNTRACE_FUNC_EXIT;

   	}

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

// For Devanagari AS

// Checks if the last character entered is a Indic independent character.

// @param aCh      - character to be checked  

// @return ETrue if this is an independent character EFalse otherwise                        

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

inline TBool IsIndicIndependentChar( const TChar aCh )

	{

	if (( aCh >= 0x0905 && aCh <= 0x0939 ) || ( aCh >= 0x0958 && aCh <= 0x0961 ))

        {

        return ETrue;

        }

    else

        {

        return EFalse;

        }

	}

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

// CAknAdaptiveSearch::ProcessCommandL

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

//

void CAknAdaptiveSearch::ProcessCommandL( TInt aCommand )

	{

	_AKNTRACE_FUNC_ENTER;

	 _AKNTRACE( "[%s][%s] Command ID: %d", "CAknAdaptiveSearch",

	         __FUNCTION__, aCommand);

	if( aCommand == CAknAdaptiveSearchGrid::ECloseGridPressed )

		{

		//hide grid

        HideAdaptiveSearchGridL();

		iSearchField->MakeVisible( ETrue );	

		iSearchField->SetFocus( ETrue );	

		}

    else if( aCommand == CAknAdaptiveSearchGrid::EDeleteLastCharPressed )

		{

		//do search text update

		if( iSearchField )

			{

			TBuf<KAknStringBufferSize> criteria;

            if ( iSearchField->Editor().SelectionLength() > 0 )

                {

                iAdaptiveSearchGrid->SetSearchTextToFindPane( criteria );

                iSearchField->SetSearchTextL( criteria );

                iSearchField->HandleControlEventL( iSearchField, EEventStateChanged );

                }

            else

                {

                iSearchField->GetSearchText( criteria );

                }

			TInt length = criteria.Length();

			if( length > 0 )

				{

				// If Devanagari

				if ( (criteria[length-1] == KLitHyphen) && length>1 && IsIndicIndependentChar(criteria[length-2]) )

					{						

					// First check if this is one of the four special ligatures, in which

					// case, there will be a halant prior to 'criteria[length-2]'			

					if ( (length > 3) && IsIndicHalantChar(criteria[length-3]) )

					    {

					    // hyphen should be removed along with the preceding 3 characters 

					    criteria = criteria.Mid( 0, (length-4) ); 

					    }

					else

					    {

					    // normal Indic character - remove the preceding character.

					    criteria = criteria.Mid( 0, (length-2) );

					    }

					}

				else

					{

					criteria = criteria.Mid( 0, (length-1) );		

					}					

				// Update the AS search field first to be ready for redraw

				iAdaptiveSearchGrid->SetSearchTextToFindPane( criteria );				

                iSearchField->SetSearchTextL( criteria );   

                iSearchField->HandleControlEventL( iSearchField, EEventStateChanged );      

				iSearchField->SetFocus( EFalse );		        			

				iSearchField->MakeVisible ( EFalse );

				iAdaptiveSearchGrid->SetSearchTextToFindPane( criteria );	

				iSearchField->DrawNow();

				if( iAdaptiveSearchTextObserver )

					{

					iSearchField->SetLanguageChangedFlag( EFalse );

					iAdaptiveSearchTextObserver->AdaptiveSearchTextChanged( iSearchField );		

					}						

				}

			}

		}

	else if ( iBlockFlag == EFalse )

	    {

	    iBlockFlag = ETrue; 	       

        TBuf<KAknStringBufferSize> criteria;

        if ( iSearchField->Editor().SelectionLength() == 0 )

            {

            iSearchField->GetSearchText( criteria );            

            }

        // Check if Devanagari 

        TInt indicHalantPos( KErrNotFound );

        TInt gridCharsLength = iGridChars->Length();

        // Search for the first appearing halant character. 

        for ( TInt index = 1; index < gridCharsLength ; ++index )

            {

            if ( IsIndicHalantChar((*iGridChars)[index]) )

                {

                indicHalantPos = index;

                break;

                }

            }

        if ( indicHalantPos < 0 || aCommand < (indicHalantPos-1) )

            {

            // Western search

            criteria.Append( iGridChars->Mid(aCommand,1) );

            }

        else

            {

            // Devanagari search

            for ( TInt index = (indicHalantPos-1); index < gridCharsLength ; ++index )

                {

                if ( aCommand == index )

                    {

                    // check if this is an Indic special ligature

                    if ( index+1 < gridCharsLength && IsIndicHalantChar((*iGridChars)[index+1]) )

                        {

                        // append the next 2 characters as well to the search criteria

                        criteria.Append( iGridChars->Mid(index,3) );

                        }

                    else

                        {

                        // send just the one character

                        criteria.Append( iGridChars->Mid(index,1) );

                        }

                    break;

                    }

                } // for

             }            

        TInt length = criteria.Length();  

        // If Devanagri Append the placeholder for dependent vowels 

    	if ( IsIndicIndependentChar( criteria[length-1] ) )

        	criteria.Append( KLitHyphen );

      	// Update the AS search field first to be ready for redraw

        iAdaptiveSearchGrid->SetSearchTextToFindPane( criteria );       

        iSearchField->SetSearchTextL( criteria );   

        iSearchField->HandleControlEventL( iSearchField, EEventStateChanged );      

    	iSearchField->SetFocus( EFalse );    	

    	iSearchField->MakeVisible ( EFalse );

        iSearchField->DrawNow();

        if( iAdaptiveSearchTextObserver )

        	{

        	iSearchField->SetLanguageChangedFlag( EFalse );

        	iAdaptiveSearchTextObserver->AdaptiveSearchTextChanged( iSearchField );	

	        }

	    }

	_AKNTRACE_FUNC_EXIT;

	}

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

// CAknAdaptiveSearch::SetSearchField

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

//	

void CAknAdaptiveSearch::SetSearchField( CAknSearchField* aSearchField )

	{

	iSearchField = aSearchField; 

    iAdaptiveSearchGrid->SetMopParent( aSearchField );

	}

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

// CAknAdaptiveSearch::ShowAdaptiveSearchGridL

// Shows adaptive search grid.

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

//

void CAknAdaptiveSearch::ShowAdaptiveSearchGridL()

	{

	if( !iAdaptiveSearchGrid->IsShown() )

        {

        iAdaptiveSearchGrid->ShowL();

        }

	}

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

// CAknAdaptiveSearch::HandleNotifyInt

// Check adaptive search availability from cenrep

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

//

void CAknAdaptiveSearch::HandleNotifyInt( TUint32 aId, TInt /*aNewValue*/ )

    {

    _AKNTRACE( "[%s][%s] The input method for adaptive search: %d", 

                               "CAknAdaptiveSearch", __FUNCTION__, aId );

    if ( aId == KAknAdaptiveSearchLastChinese )

        {

        TRAP_IGNORE( iSearchField->HandleControlEventL(iSearchField, EEventStateChanged) );          	

        }

    if ( aId == KAknAdaptiveSearchChinesePRC )

        {

        TRAP_IGNORE( iSearchField->HandleControlEventL(iSearchField, EEventStateChanged) );  

        }   

    if ( aId == KAknAdaptiveSearchChineseTW )

        {

        TRAP_IGNORE( iSearchField->HandleControlEventL(iSearchField, EEventStateChanged) );  	

        }

    if ( aId == KAknAdaptiveSearchChineseHongkong )

       {

       TRAP_IGNORE( iSearchField->HandleControlEventL(iSearchField, EEventStateChanged) );  	

       }       

    if( iAdaptiveSearchTextObserver )

       {

       iSearchField->SetLanguageChangedFlag( ETrue ); 

       iAdaptiveSearchTextObserver->AdaptiveSearchTextChanged( iSearchField );

       }    

    }

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

// CAknAdaptiveSearch::HideAdaptiveSearchGrid

// Hides adaptive search grid.

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

//

void CAknAdaptiveSearch::HideAdaptiveSearchGridL()

	{

	_AKNTRACE_FUNC_ENTER;

	if( iAdaptiveSearchGrid->IsShown() )

	    {

        iAdaptiveSearchGrid->HideL();      

	    }	

	 _AKNTRACE_FUNC_EXIT;

	}

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

// CAknAdaptiveSearch::InvertAdaptiveSearchGridVisibility

// Hides adaptive search grid if it shown, and shows if it is hide.

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

//	

void CAknAdaptiveSearch::InvertAdaptiveSearchGridVisibilityL( TBool aSelectAll )

	{

	 _AKNTRACE_FUNC_ENTER;

	// update the search text here if showing

	TInt textLength = 0;

	if( !iAdaptiveSearchGrid->IsShown() && &(iSearchField->Editor()) )

	    {

	    textLength = iSearchField->Editor().TextLength();

	    HBufC* searchText = NULL;

	    TPtrC finalText( KNullDesC );

	    if( textLength > 0 )

	        {

	        TRAP_IGNORE( searchText = iSearchField->Editor().GetTextInHBufL() );

    	    if( searchText )

    	        {

    	        finalText.Set( *searchText ); // set the value

    	           _AKNDEBUG(

    	                    _LIT( KClassName, "CAknAdaptiveSearch" );

    	                    _LIT( KFunctionName, "InvertAdaptiveSearchGridVisibilityL" );

    	                    _LIT( KFormat, "[%S][%S] Final text is: %S");

    	                    _AKNTRACE( KFormat, 

    	                    &KClassName, &KFunctionName, &finalText );

    	                    );

    	        }

	        }	    

    	iAdaptiveSearchGrid->SetSearchTextToFindPane( finalText );    

    	if( searchText )

    	    {

    	    delete searchText;

    	    searchText = NULL;

    	    }

	    }

	TBool shown( !(iAdaptiveSearchGrid->IsShown()) );

	if ( shown )

	    {

	    iSearchField->SetFocus( EFalse );	 

	    iSearchField->MakeVisible( EFalse );   

	    }

	else

	    {

	    iSearchField->Editor().RemoveFlagFromUserFlags( CEikEdwin::EAvkonDisableVKB );

	    iSearchField->MakeVisible( ETrue );      

	    iSearchField->SetFocus( ETrue );	         

	    }

    iAdaptiveSearchGrid->SetVisibilityL( shown, aSelectAll );

    _AKNTRACE_FUNC_EXIT;

	}

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

// CAknAdaptiveSearch::AddAdaptiveSearchTextObserverL

// Adds an adaptive search text observer.

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

// 

void CAknAdaptiveSearch::AddAdaptiveSearchTextObserverL( MAdaptiveSearchTextObserver* aObserver )

	{

	iAdaptiveSearchTextObserver = aObserver;  	

	}

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

// CAknAdaptiveSearch::RemoveAdaptiveSearchTextObserver

// Removes an adaptive search text observer. 

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

//

TBool CAknAdaptiveSearch::RemoveAdaptiveSearchTextObserver( MAdaptiveSearchTextObserver* aObserver )

	{

	if( iAdaptiveSearchTextObserver == aObserver )

		{

		iAdaptiveSearchTextObserver = NULL;

		return ETrue;

		}

	else

		{

		return EFalse;

		}

	}

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

// CAknAdaptiveSearch::UpdateGridSkinL()

// Update adaptive search grid skin, since it can't recieve any messages