/*

* Copyright (c) 2001-2009 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 "TAGMA.H"

#include "TmTextDrawExt.h"

#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS

#include "TAGMA_INTERNAL.H"

#endif

/**

 * MTmSource decorator that can draw text in the appropriate highlight colors.

 * The text must already be on the screen before this is drawn over it.

 * @since 7.0

 * @internalComponent

 */

NONSHARABLE_CLASS(TTmHighlightSource) : public MTmSource

	{

public:

	TTmHighlightSource(MTmSource& aDelegate);

	/** returns EFalse if the selection foreground and background colors are the same */

	inline TBool HighlightVisible() {return 0xFFFFFF & (iForeground.Value() ^ iBackground.Value());}

	void DrawBackground(CGraphicsContext& aGc,

		const TPoint& aTextLayoutTopLeft, const TRect& aRect,

		const TLogicalRgb& aBackground, TRect& aRectDrawn) const;

	void DrawLineGraphics(CGraphicsContext& aGc,

		const TPoint& aTextLayoutTopLeft, const TRect& aRect,

		const TTmLineInfo& aLineInfo) const;

	void DrawText(CGraphicsContext& aGc,

		const TPoint& aTextLayoutTopLeft, const TRect& aRect,

		const TTmLineInfo& aLineInfo, const TTmCharFormat& aFormat,

		const TDesC& aText, const TInt aStart, const TInt aEnd, const TPoint& aTextOrigin, TInt aExtraPixels) const;

	void DrawPicture(CGraphicsContext& aGc,

		const TPoint& aTopLeft, const TRect& aRect,

		MGraphicsDeviceMap& aDevice, const CPicture& aPicture) const;

	// MTmSource functions: just pass through

	MGraphicsDeviceMap& FormatDevice() const;

	MGraphicsDeviceMap& InterpretDevice() const;

	TInt DocumentLength() const;

	void GetText(TInt aPos,TPtrC& aText,TTmCharFormat& aFormat) const;

	void GetParagraphFormatL(TInt aPos,RTmParFormat& aFormat) const;

	TInt ParagraphStart(TInt aPos) const;

	CPicture* PictureL(TInt aPos) const;

	TInt GetPictureSizeInTwipsL(TInt aPos,TSize& aSize) const;

	TBool PageBreakInRange(TInt aStartPos,TInt aEndPos) const;

	TAny* GetExtendedInterface(const TUid& aInterfaceId);

private:

	/**

	 * Colour to draw the text in

	 * @internalComponent

	 */

	TRgb iForeground;

	/**

	 * Colour to draw the background in

	 * @internalComponent

	 */

	TRgb iBackground;

	/**

	 * Colour to blend the pictures with

	 * @internalComponent

	 */

	TRgb iXorPictures;

	MTmSource& iDelegate;

	MTmTextDrawExt* iTmTextDrawExt;//The implementation of MTmTextDrawExt interface will be

								   //used and it will replace all CGraphicsContext::Draw<Item> calls.

	TTmTextDrawExt	iTmTextDrawExtDefault;//The default implementation of MTmTextDrawExt

	};