/*

* Copyright (c) 1997-1999 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 <eiklabel.h>

#include <coeutils.h>

#include <eikenv.h>

#include <eikpanic.h>

#include <barsread.h>

#include <uikon.hrh>

#include "laflabel.h"

#include <gulcolor.h>

#include <AknUtils.h>

#include <bidivisual.h> 

#include <biditext.h>

#include <AknBidiTextUtils.h>

#include <AknPictographInterface.h>

#include <AknPictographDrawerInterface.h>

#include <AknLayoutFont.h>

const TInt KTextEmphasisMask		= 0x30;

const TInt KTextBufferReserveLength = 0x40;

/* This class needs to be in .cpp file so that we

   do not accidentally make it derivable; that would

   destroy all the binary compability advantages this

   class has..

   */

NONSHARABLE_CLASS(CEikLabelExtension) : public CBase

	{

public: // enums

    enum {

        ECropText,

        EUseDynamicBidiTextAlignment,

        EUseBrushStyle

        };

public:

	static CEikLabelExtension* NewL();

	~CEikLabelExtension();

	void SetTextLengthL(TInt aLength);

private:

	CEikLabelExtension();

	void ConstructL();

public: //data

	HBufC* iLabelLine;

    TBitFlags iFlags;

    CWindowGc::TBrushStyle iBrushStyle;

    CAknPictographInterface* iPictographInterface; // not owned

	};

CEikLabelExtension* CEikLabelExtension::NewL()

	{

	CEikLabelExtension* self = new(ELeave) CEikLabelExtension;

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

CEikLabelExtension::CEikLabelExtension()

	{

    iFlags.ClearAll();

	}

CEikLabelExtension::~CEikLabelExtension()

	{

	delete iLabelLine;

	}

void CEikLabelExtension::ConstructL()

	{

	iLabelLine = HBufC::NewL(0);

	}

void CEikLabelExtension::SetTextLengthL(TInt aLength)

	{

    aLength += TBidiLogicalToVisual::KMinCharAvailable;

	if (aLength <= iLabelLine->Des().MaxLength())

		return;

	HBufC* tempBuf = HBufC::NewL(aLength);

	delete iLabelLine;

	iLabelLine = tempBuf;

	}

/**

 * Gets the list of logical colors employed in the drawing of the control,

 * paired with an explanation of how they are used. Appends the list to aColorUseList.

 *

 * @since ER5U 

 */

EXPORT_C void CEikLabel::GetColorUseListL(CArrayFix<TCoeColorUse>& aColorUseList) const

	{

	CCoeControl::GetColorUseListL(aColorUseList);

	TInt commonAttributes = TCoeColorUse::ESurrounds|TCoeColorUse::ENormal|TCoeColorUse::ENeutral;

	TCoeColorUse colorUse;

	colorUse.SetLogicalColor(EColorLabelText);

	colorUse.SetUse(TCoeColorUse::EFore|TCoeColorUse::EActive|commonAttributes);

	aColorUseList.AppendL(colorUse);

	colorUse.SetLogicalColor(EColorControlBackground);

	colorUse.SetUse(TCoeColorUse::EBack|TCoeColorUse::EActive|commonAttributes);

	aColorUseList.AppendL(colorUse);

	colorUse.SetLogicalColor(EColorLabelDimmedText);

	colorUse.SetUse(TCoeColorUse::EFore|TCoeColorUse::EDimmed|commonAttributes);

	aColorUseList.AppendL(colorUse);

	TInt highlightAttributes = TCoeColorUse::EHighlights|TCoeColorUse::ENormal|TCoeColorUse::ENeutral;

	colorUse.SetLogicalColor(EColorLabelTextEmphasis);

	colorUse.SetUse(TCoeColorUse::EFore|TCoeColorUse::EActive|highlightAttributes);

	aColorUseList.AppendL(colorUse);

	colorUse.SetLogicalColor(EColorLabelHighlightFullEmphasis);

	colorUse.SetUse(TCoeColorUse::EBack|TCoeColorUse::EActive|highlightAttributes);

	aColorUseList.AppendL(colorUse);

	colorUse.SetLogicalColor(EColorLabelHighlightPartialEmphasis);

	colorUse.SetUse(TCoeColorUse::EBack|TCoeColorUse::EDimmed|highlightAttributes);

	aColorUseList.AppendL(colorUse);

	}

/**

 * Handles a change to the control's resources of type aType

 * which are shared across the environment, e.g. colors or fonts.

 *

 * @since ER5U 

 */

EXPORT_C void CEikLabel::HandleResourceChange(TInt aType)

	{

	CCoeControl::HandleResourceChange(aType);

	}

EXPORT_C CEikLabel::~CEikLabel()

	{

	delete iText;

	delete iExtension;

 	}

EXPORT_C CEikLabel::CEikLabel()	: 

    iLabFlags( EUseLogicalToVisualConversion ),

    iGapBetweenLines( LafLabel::DefaultGapBetweenLines() )

	{

	__DECLARE_NAME(_S("CEikLabel"));

	iFont=iCoeEnv->NormalFont();

	}

EXPORT_C void CEikLabel::SetLabelAlignment(TInt aAlignment)

	{

    if (CheckAndCreateExtension())

        iExtension->iFlags.Assign(CEikLabelExtension::EUseDynamicBidiTextAlignment, (aAlignment == ELayoutAlignBidi));

    switch(aAlignment)

        {

        case ELayoutAlignBidi: // alignment handled above in extension above

            break;

        default:

            SetAlignment(AknLayoutUtils::GulAlignFromId(aAlignment));

            break;

        }

	}

EXPORT_C void CEikLabel::SetBrushStyle(CWindowGc::TBrushStyle aBrushStyle)

    {

    if (CheckAndCreateExtension())

        {

        iExtension->iBrushStyle = aBrushStyle;

        iExtension->iFlags.Set(CEikLabelExtension::EUseBrushStyle);

        }

    }

EXPORT_C void CEikLabel::SetBrushStyleFromContext()

    {

    if (CheckAndCreateExtension()) // can't be sure creation above passed

        {

        iExtension->iFlags.Clear(CEikLabelExtension::EUseBrushStyle);

        }

    }

EXPORT_C void CEikLabel::ConstructFromResourceL(TResourceReader& aReader)

	{

	TInt flags=aReader.ReadInt16();

	SetUnderlining(flags&EikLabelUnderline);

	SetStrikethrough(flags&EikLabelStrikeThrough);

	iAlignment.SetHAlignment((TGulHAlignment)aReader.ReadInt16());

	iAlignment.SetVAlignment((TGulVAlignment)aReader.ReadInt16());

	TInt standardFont=aReader.ReadInt16();

	switch (standardFont)

		{

	case EEikLabelFontLegend:

		iFont=iEikonEnv->LegendFont();

		break;

	case EEikLabelFontAnnotation:

		iFont=iEikonEnv->AnnotationFont();

		break;

	default:

		break;

		}

	TInt length=aReader.ReadInt16();

	if (length)

		SetBufferReserveLengthL(length);

	SetTextL(aReader.ReadTPtrC());

	}

EXPORT_C void CEikLabel::SetTextL(const TDesC& aText)

	{

	__ASSERT_DEBUG(&aText,Panic(EEikPanicLabelNullText));

	if (iLabFlags&KTextBufferReserveLength || 

		(iText && iText->Des().MaxLength() >= aText.Length()))

		{

        *iText=aText; // will panic if not long enough

		}

    else

        {

        User::LeaveIfError( AknBidiTextUtils::PrepareRunInfoArray( aText ) );

        HBufC* newText=aText.AllocL();

	    delete(iText); // after the AllocL succeeds

	    iText=newText;

		if ( !iExtension )

			{

			iExtension = CEikLabelExtension::NewL();

			}

		iExtension->SetTextLengthL(iText->Length());

        }

    if (iExtension)

        iExtension->iFlags.Clear(CEikLabelExtension::ECropText); // reset ECropText

    iNumberOfLines=1;

    TPtrC ptr=(*iText);

    FOREVER

        {

        const TInt offset=ptr.Locate('\n');

        if (offset<0 || offset==ptr.Length()-1)

            break;

        iNumberOfLines++;

        ptr.Set(ptr.Mid(offset+1));

        }

	return ;

 	}

EXPORT_C void CEikLabel::CropText()

	{

	if ( iExtension ) // if no extension do nothing as SetTextL has not yet been called

		iExtension->iFlags.Set(CEikLabelExtension::ECropText);

	}

TInt CEikLabel::HeightInPixels() const

    {

    }

TInt CEikLabel::WidthInPixels(TPtrC& aText) const

    {

    TInt maxLineWidth=0;

    FOREVER

        {

        const TInt offset=aText.Locate('\n');

        TPtrC left=aText;

        if (offset>=0)

            left.Set(aText.Left(offset));

        CFont::TMeasureTextInput input;

        if ( !(iLabFlags & EUseLogicalToVisualConversion) )

            {

            input.iFlags = CFont::TMeasureTextInput::EFVisualOrder;

            }

        TInt thisWidth = iFont->MeasureText( left, &input );

        if (thisWidth>maxLineWidth)

            maxLineWidth=thisWidth;

        if (offset<0 || offset==aText.Length()-1)

            break;

        aText.Set(aText.Mid(offset+1));

        }

    return(iMargin.iLeft + iMargin.iRight + maxLineWidth);

    }

TInt CEikLabel::HeightInPixels(const TDesC& aText) const

    {

    // Calculate amount of lines in aText

    TInt numberOfLines = 1;

    TPtrC ptr=aText;

    FOREVER

        {

        const TInt offset=ptr.Locate('\n');

        if (offset<0 || offset==ptr.Length()-1)

            break;

        numberOfLines++;

        ptr.Set(ptr.Mid(offset+1));

        }

    // Calculate height.

    return(iMargin.iTop+iMargin.iBottom + iGapBetweenLines*(numberOfLines-1) + numberOfLines*iFont->HeightInPixels());

    }

EXPORT_C void CEikLabel::Draw( const TRect& /*aRect*/ ) const

    {

    CWindowGc& gc = SystemGc();

    DrawToContext( gc, NULL );

    gc.SetOpaque( EFalse ); // transparency back on

    }

void CEikLabel::DrawToContext( CBitmapContext& aContext, 

        const TRgb* aOverrideColor ) const

    {

    __ASSERT_ALWAYS(iText,Panic(EEikPanicLabelNullText));

    TInt textTooLong = KErrNone;

    if (iExtension->iLabelLine->Des().MaxLength() < iText->Length() + TBidiLogicalToVisual::KMinCharAvailable)

        {

        TRAP(textTooLong, iExtension->SetTextLengthL(iText->Length()));

        } // textTooLong condition is handled later in this function, tries to recover as much as possible

    TBool outlineEffectOn = EFalse;

    const CAknLayoutFont* layoutFont = CAknLayoutFont::AsCAknLayoutFontOrNull( iFont ); 

    if (layoutFont) 

        {

        outlineEffectOn = layoutFont->FontSpecification().IsOutlineEffectOn(); 

        }

    CBitmapContext& gc = aContext;

    if (IsStrikethrough())

        {

        gc.SetStrikethroughStyle(EStrikethroughOn);

        }

    else

        {

        gc.SetStrikethroughStyle(EStrikethroughOff);

        }

    if (IsUnderlined())

        {

        gc.SetUnderlineStyle(EUnderlineOn);

        }

    else

        {

        gc.SetUnderlineStyle(EUnderlineOff);

        }

    if ( aOverrideColor )

        {

        gc.SetPenColor(*aOverrideColor);

        gc.SetBrushColor(*aOverrideColor);

        }

    else if ((iLabFlags&KTextEmphasisMask) != ENoEmphasis)

        {

        SetupGcForEmphasis(gc);

        }

    else

        {

        TRgb penColor;

        TRgb brushColor;

        if (IsDimmed()) 

            {

            penColor = iEikonEnv->ControlColor(EColorLabelDimmedText,*this); 

            brushColor = iEikonEnv->ControlColor(EColorControlDimmedBackground,*this); 

            }

        else

            {

            penColor = iEikonEnv->ControlColor(EColorLabelText,*this); 

            brushColor = iEikonEnv->ControlColor(EColorControlBackground,*this); 

            }

        if(outlineEffectOn)

            {

            ConvertColorsForOutlineEffect(penColor, brushColor); 

            }

        gc.SetPenColor(penColor); 

        gc.SetBrushColor(brushColor); 

        }

    gc.UseFont(iFont);

    if (iExtension->iFlags.IsSet(CEikLabelExtension::EUseBrushStyle))

        {

        gc.SetBrushStyle(iExtension->iBrushStyle);

        }

    const TRect rect = Rect();

    TInt preHeight=iMargin.iTop; // used on first line

    TInt postHeight=iMargin.iBottom; // used on last line

    if (deltaHeight>0)

        {

        switch(iAlignment.VAlignment())

            {

            case EVTop:

                postHeight+=deltaHeight;

                break;

            case EVBottom:

                preHeight+=deltaHeight;

                break;

            case EVCenter:

                TInt postInc=deltaHeight/2; // give odd pixel to pre-Height

                preHeight+=deltaHeight-postInc;

                postHeight+=postInc;

            }

        }

    TInt lineNo=0;

    TPtrC ptr=(*iText);

    TRect box=rect;

    TBool clippedAtBottom=EFalse;

    TInt textPaneTopToBaseline(0);

    TInt textPaneHeight(0);

    if ( layoutFont )

        {

        textPaneTopToBaseline = layoutFont->TextPaneTopToBaseline();

        textPaneHeight = layoutFont->TextPaneHeight();

        }

    else

        {

        }

    // iGapBetweenLines is defined as baseline separation - CFont::HeightInPixels

    // Since we are using the better metrics above, we have to actually use something which is 

    // derived from iGapBetweenLines, but is e.g. reduced if textpaneheight > heightInPixels

    FOREVER

        {

        TInt ascent=textPaneTopToBaseline+preHeight;

        TInt lineHeight=textPaneHeight+preHeight;

        if (++lineNo==iNumberOfLines)

            {

            lineHeight+=postHeight;

            }

        TInt off=ptr.Locate('\n');

        TPtrC left=ptr;

        if (off>=0)

            {

            left.Set(ptr.Left(off));

            }

        box.iBr.iY=box.iTl.iY+lineHeight;

        if (box.iBr.iY>rect.iBr.iY)

            {

            box.iBr.iY=rect.iBr.iY;

            clippedAtBottom=ETrue;

            }

        CGraphicsContext::TTextAlign align=iAlignment.TextAlign();

        TInt margin = iMargin.iLeft;

        TBidiText::TDirectionality labelDirectionality = TBidiText::TextDirectionality(*iText);

        if (iExtension->iFlags.IsSet(CEikLabelExtension::EUseDynamicBidiTextAlignment))

            {

            switch(labelDirectionality)

                {

                case TBidiText::ELeftToRight:

                    align = CGraphicsContext::ELeft;

                    break;

                case TBidiText::ERightToLeft:

                    align = CGraphicsContext::ERight;

                    break;

                default:

                    break; // do nothing

                }

            }

        if (align==CGraphicsContext::ERight)

            {

            margin = iMargin.iRight;

            }

        else if (align==CGraphicsContext::ECenter)

            {

            margin -= iMargin.iRight;

            }

        TRect adjustedBox( box ) ;  // create a new box to accommodate underline if present (without affecting layout)

        if ( IsUnderlined() )

            {

            TAknTextDecorationMetrics decoration(iFont);

            TInt underlineWidth = decoration.UnderlineHeight();

            TInt underlineSpace = decoration.BaselineToUnderlineOffset();

            if (  ( textPaneTopToBaseline + underlineSpace ) > textPaneHeight )

                {

                adjustedBox.iBr.iY += (  textPaneTopToBaseline + underlineSpace - textPaneHeight ) ;

                }

            }

        TPtr text = iExtension->iLabelLine->Des();

        TInt textMaxLength = text.MaxLength();

        TBool dontDoComplicatedDraw = EFalse;

        TInt usableLength = 0;

        if (textTooLong == KErrNone || textMaxLength >= left.Length() + TBidiLogicalToVisual::KMinCharAvailable)

            {

            usableLength = left.Length(); // no problem with memory

            }

        else

            { // problem with lack of memory so find a usable length.

            if (labelDirectionality == TBidiText::ELeftToRight || !(iLabFlags & EUseLogicalToVisualConversion))

                { // most likely western text so just display logically (no truncation)

                dontDoComplicatedDraw = ETrue;

                }