/*

* Copyright (c) 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:

*

*/

#include <eikedwin.h>

#include <tagma.h>

#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS

#include <tagmalayoutandsource.h>

#endif

#include <frmtlay.h>

#include <frmtview.h>

#include <txtrich.h>

#include "FormCursorModifier.h"

#include "FromCursorModifierUtils.h"

CFormCursorModifier* CFormCursorModifier::NewL(CTextView* aTextView, CTextLayout* aTextLayout)

	{

	CFormCursorModifier* self = new (ELeave) CFormCursorModifier(aTextView, aTextLayout);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop();

	return self;

	}

CFormCursorModifier::~CFormCursorModifier()

	{

	}

void CFormCursorModifier::HandleFormCursorModifierEventL(TFormCursorModifierEvent aEvent, TInt aData1, TAny* aData2)

	{

	switch (aEvent)

		{

		case EEventNull:

			break;

		case EEventInitialiseEditor:

			if (iTextLayout)

				{

				if (iTextLayout->DocumentLength() == 0 && aData2) // Added aData2 check. It is NULL when whole text is selected and cut operation is made.

					InitialiseCursorPositionL(static_cast<CEikEdwin*>(aData2));

				}

			break;

		case EEventInlineEditUpdate:

			break;

		case EEventInsertion:

			break;

		case EEventDeletion:

			if (iTextLayout)

				{

				if (iTextLayout->DocumentLength() == 0)

					InitialiseCursorPositionL(static_cast<CEikEdwin*>(aData2));

				else

					NormaliseCursorPositionFollowingDeleteL();

				}

			break;

		case EEventNavigation:

			if (iTextLayout && aData1 == 0) // aData1 is selection length

				NormaliseCursorPositionFollowingNavigationL();

			break;

		case EEventInputDirectionIsLeftToRight:

			SetDirectionality(ELeftToRight);

			break;			

		case EEventInputDirectionIsRightToLeft:

			SetDirectionality(ERightToLeft);

			break;

		default:

			// as yet undefined enumerations should be handled gracefully

			// here - this must not panic

			break;

		}

	}

void CFormCursorModifier::SetTextView(CTextView* aTextView)

	{

	iTextView = aTextView;

	}

void CFormCursorModifier::SetTextLayout(CTextLayout* aTextLayout)

	{

	iTextLayout = aTextLayout;

	}

CFormCursorModifier::CFormCursorModifier(CTextView* aTextView, CTextLayout* aTextLayout) :

	iTextView(aTextView),

	iTextLayout(aTextLayout),

	iDirectionality(ELeftToRight)

	{

	}

void CFormCursorModifier::ConstructL()

	{

	}

void CFormCursorModifier::NormaliseCursorPositionFollowingDeleteL()

	{

	TFormCursorModifierUtils cursorModifierUtils(*iTextView, *iTextLayout);

	TTmDocPosSpec pos = cursorModifierUtils.DocPos();

	CTmTextLayout::TTmChunkDescription leftChunk;

	CTmTextLayout::TTmChunkDescription rightChunk;

	iTextLayout->TagmaTextLayout().FindAdjacentChunks(pos, leftChunk, rightChunk);

	TBool isRTLPara = cursorModifierUtils.IsRightToLeftParagraph(pos);

	if (isRTLPara && !rightChunk.iRightToLeft || !isRTLPara && leftChunk.iRightToLeft)

		cursorModifierUtils.ToggleVisualDocPosL();	

	}

void CFormCursorModifier::NormaliseCursorPositionFollowingNavigationL()

	{

	TFormCursorModifierUtils cursorModifierUtils(*iTextView, *iTextLayout);

	if (cursorModifierUtils.VisualCursorBetweenOpposingChunks())

		{

		TTmDocPosSpec pos = cursorModifierUtils.DocPos();

		CTmTextLayout::TTmChunkDescription leftChunk;

		CTmTextLayout::TTmChunkDescription rightChunk;

		iTextLayout->TagmaTextLayout().FindAdjacentChunks(pos, leftChunk, rightChunk);

		if (leftChunk.iStart == -1)

			{ // left end of a line

			if (rightChunk.iRightToLeft)

				{ // set doc pos trailing at the end of the right chunk

				pos.iType = TTmDocPosSpec::ETrailing;

				pos.iPos = rightChunk.iEnd;

				}

			else // rightChunk is LTR

				{ // set doc pos leading at start of right chunk

				pos.iType = TTmDocPosSpec::ELeading;

				pos.iPos = rightChunk.iStart;

				}

			}

		else if (rightChunk.iStart == -1)

			{ // right end of a line

			if (leftChunk.iRightToLeft)

				{ // set doc pos leading at start of left chunk

				pos.iType = TTmDocPosSpec::ELeading;

				pos.iPos = leftChunk.iStart;

				}

			else // leftChunk is LTR

				{ // set doc pos trailing at the end of the left chunk

				pos.iType = TTmDocPosSpec::ETrailing;

				pos.iPos = leftChunk.iEnd;

				}

			}

		else // middle of a line

			{

			if (iDirectionality == ERightToLeft)

				{

				if (rightChunk.iRightToLeft)

					{ // set doc pos trailing at the end of the right chunk

					pos.iType = TTmDocPosSpec::ETrailing;

					pos.iPos = rightChunk.iEnd;

					}

				else // rightChunk is LTR

					{ // set doc pos leading at start of left chunk

					pos.iType = TTmDocPosSpec::ELeading;

					pos.iPos = leftChunk.iStart;

					}

				}

			else // direction is LTR

				{

				if (rightChunk.iRightToLeft)

					{ // set doc pos trailing at the end of left chunk

					pos.iType = TTmDocPosSpec::ETrailing;

					pos.iPos = leftChunk.iEnd;

					}

				else // rightChunk is LTR

					{ // set doc pos leading at the start of right chunk

					pos.iType = TTmDocPosSpec::ELeading;

					pos.iPos = rightChunk.iStart;

					}

				}

			}

		// set the doc position...

		cursorModifierUtils.SetDocPosL(pos);

		}

	}

void CFormCursorModifier::InitialiseCursorPositionL(CEikEdwin* aEdwin)

	{

	CRichText* rT = static_cast<CRichText*>(aEdwin->Text());

	CParaFormat* paraF = CParaFormat::NewLC();

	paraF->iLanguage = (iDirectionality == ELeftToRight) ? ELangEnglish : ELangArabic;

	TParaFormatMask langMask;

	langMask.SetAttrib(EAttParaLanguage);

	rT->ApplyParaFormatL(paraF, langMask, 0, 1);

	if (iTextView)

		iTextView->HandleRangeFormatChangeL(TCursorSelection(0, iTextLayout->DocumentLength()), ETrue);

	CleanupStack::PopAndDestroy(); // paraF

	}

void CFormCursorModifier::SetDirectionality(TDirectionality aDirectionality)

	{

	iDirectionality = aDirectionality;

	}