/*

* 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 <aknenv.h>

#include <aknsettingcache.h>

#include <eikedwin.h>

#include <txtrich.h>

#include "akncursormanager.h"

#include "akninputpolicy.h"

CAknInputPolicyManager* CAknInputPolicyManager::NewL(CEikEdwin* aEdwin)

	{

	CAknInputPolicyManager* self = new (ELeave) CAknInputPolicyManager(aEdwin);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop();

	return self;

	}

CAknInputPolicyManager::~CAknInputPolicyManager()

	{

	}

void CAknInputPolicyManager::HandleInputPolicyManagerEventL(TEventType aEvent, TInt /*aData1*/, TAny* /*aData2*/)

	{

	switch (aEvent)

		{

		case ECMEventNull:

			break;

		case ECMEventInitialise:

			if (iEdwin->TextLength() == 0)

				SetCursorUsingLanguageL();

			break;

		case ECMEventInlineEditUpdate:

			break;

		case ECMEventInsertion:

			break;

		case ECMEventDeletion:

			if (iEdwin->TextLength() == 0)

				SetCursorUsingLanguageL();

			else

				NormaliseCursorPositionFollowingDeleteL();

			break;

		case ECMEventNavigation:

			NormaliseCursorPositionFollowingNavigationL();

			break;

		default:

			break;

		}

	}

CAknInputPolicyManager::CAknInputPolicyManager(CEikEdwin* aEdwin) :

	iEdwin(aEdwin)

	{

	}

void CAknInputPolicyManager::ConstructL()

	{

	}

void CAknInputPolicyManager::NormaliseCursorPositionFollowingDeleteL()

	{

	CAknCursorManager* cursorManager = CAknCursorManager::NewL(iEdwin->EditorState());

	CleanupStack::PushL(cursorManager);

	TTmDocPosSpec pos = cursorManager->DocPos();

	CTmTextLayout::TTmChunkDescription leftChunk;

	CTmTextLayout::TTmChunkDescription rightChunk;

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

	TBool isRTLPara = cursorManager->IsRightToLeftParagraph(pos);

	if (!isRTLPara && leftChunk.iRightToLeft ||

		isRTLPara && !rightChunk.iRightToLeft)

		cursorManager->ToggleVisualDocPosL();

	CleanupStack::PopAndDestroy(); // cursorManager

	}

void CAknInputPolicyManager::NormaliseCursorPositionFollowingNavigationL()

	{

	CAknCursorManager* cursorManager = CAknCursorManager::NewL(iEdwin->EditorState());

	CleanupStack::PushL(cursorManager);

	if (cursorManager->VisualCursorBetweenOpposingChunks())

		{

		TTmDocPosSpec pos = cursorManager->DocPos();

		CTmTextLayout::TTmChunkDescription leftChunk;

		CTmTextLayout::TTmChunkDescription rightChunk;

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

		CAknSettingCache& cache = CAknEnv::Static()->SettingCache();

		TLanguage currentLanguage = cache.InputLanguage();

		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

			{

			currentLanguage &= KAknLanguageMask;

			if (currentLanguage == ELangArabic || currentLanguage == ELangHebrew)

				{

				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 // language 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...

		cursorManager->SetDocPosL(pos);

		}

	CleanupStack::PopAndDestroy(); // cursorManager

	}

void CAknInputPolicyManager::SetCursorUsingLanguageL()

	{

	CAknSettingCache& cache = CAknEnv::Static()->SettingCache();

	TLanguage currentLanguage = cache.InputLanguage();

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

	CParaFormat* paraF = CParaFormat::NewLC();

	paraF->iLanguage = currentLanguage;

	TParaFormatMask langMask;

	langMask.SetAttrib(EAttParaLanguage);

	rT->ApplyParaFormatL(paraF, langMask, iEdwin->CursorPos(), 1);

	iEdwin->TextView()->HandleRangeFormatChangeL(TCursorSelection(0, iEdwin->TextLength()), ETrue);

	CleanupStack::PopAndDestroy(); // paraF

	}