textrendering/textformatting/inc/FRMTLAY_INTERNAL.H
author Pat Downey <patd@symbian.org>
Fri, 04 Jun 2010 10:37:54 +0100
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permissions -rw-r--r--
Revert last code drop.
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#ifndef __FRMTLAY_INTERNAL_H__
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#define __FRMTLAY_INTERNAL_H__
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#include <e32std.h>
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#include <e32base.h>
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#include <gdi.h>
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#include <tagma.h>
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#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS
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#include <tagma_internal.h>
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#endif
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class MLayDoc;
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class MFormCustomInterfaceProvider; 
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class MFormCustomInvisibleCharacterRemapper;
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class MFormCustomWrap;
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class MFormCustomDraw;
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/**
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@internalTechnology
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Internal to Symbian
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*/
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NONSHARABLE_CLASS(TLayDocTextSource) : public MTmSource, public MFormLabelApi, public MTmTextDrawExt, public MTmCustomExtension
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	{
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	public:
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	enum
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		{
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		EDefaultFontHeightIncreaseFactor = 7,
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		EDefaultMinimumLineDescent = 3
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		};
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	TLayDocTextSource();
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	// overrides for MTmSource pure virtual functions
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	MGraphicsDeviceMap& FormatDevice() const;
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	MGraphicsDeviceMap& InterpretDevice() const;
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	TInt DocumentLength() const;
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	void GetText(TInt aPos,TPtrC& aText,TTmCharFormat& aFormat) const;
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	void GetParagraphFormatL(TInt aPos,RTmParFormat& aFormat) const;
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	TInt ParagraphStart(TInt aPos) const;
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	// overrides for other MTmSource virtual functions
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	TRgb SystemColor(TUint aColorIndex,TRgb aDefaultColor) const;
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	CPicture* PictureL(TInt aPos) const;
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	TInt GetPictureSizeInTwipsL(TInt aPos,TSize& aSize) const;
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	TBool LabelModeSelect(TLabelType aType, TInt aPos);
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	void LabelModeCancel();
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	void LabelMetrics(TLabelType aType, TSize& aLabelSize, TInt& aMarginSize) const;
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	TUint Map(TUint aChar) const;
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	void SetLineHeight(const TLineHeightParam& aParam,TInt& aAscent,TInt& aDescent) const;
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	TBool PageBreakInRange(TInt aStartPos,TInt aEndPos) const;
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	void DrawBackground(CGraphicsContext& aGc,const TPoint& aTextLayoutTopLeft,const TRect& aRect,
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						const TLogicalRgb& aBackground,TRect& aRectDrawn) const;
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	void DrawLineGraphics(CGraphicsContext& aGc,const TPoint& aTextLayoutTopLeft,const TRect& aRect,
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						  const TTmLineInfo& aLineInfo) const;
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	void DrawText(CGraphicsContext& aGc,const TPoint& aTextLayoutTopLeft,const TRect& aRect,
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				  const TTmLineInfo& aLineInfo,const TTmCharFormat& aFormat,
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				  const TDesC& aText,const TPoint& aTextOrigin,TInt aExtraPixels) const;
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	virtual void DrawPicture(CGraphicsContext& aGc,
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							 const TPoint& aTextLayoutTopLeft, const TRect& aRect,
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							 MGraphicsDeviceMap& aDevice, const CPicture& aPicture) const;
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	void DrawText(CGraphicsContext& aGc,const TPoint& aTextLayoutTopLeft,const TRect& aRect,
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				  const TTmLineInfo& aLineInfo,const TTmCharFormat& aFormat,
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				  const TDesC& aText, const TInt aStart, const TInt aEnd, const TPoint& aTextOrigin,TInt aExtraPixels) const;
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	// overrides for the MTmSource virtual functions which implements the MFormCustomWrap
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	// if iCustomWrap is set. 
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	TBool LineBreakPossible(TUint aPrevClass,TUint aNextClass,TBool aHaveSpaces) const;
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	TUint LineBreakClass(TUint aCode,TUint& aRangeStart,TUint& aRangeEnd) const;
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	TBool GetLineBreakInContext(const TDesC& aText,TInt aMinBreakPos,TInt aMaxBreakPos,
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												 TBool aForwards,TInt& aBreakPos) const;
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	TBool IsHangingCharacter(TUint aChar) const;
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	// other functions
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	TBool CanMap() const;
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	TAny* GetExtendedInterface(const TUid& aInterfaceId);
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	//MTmTextDrawExt implementations
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	virtual void DrawLine(CGraphicsContext& aGc, const TPoint& aPt1, const TPoint& aPt2) const;
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	virtual void DrawText(CGraphicsContext& aGc, const TDesC& aText, const TPoint& aPt) const;
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	virtual void DrawRect(CGraphicsContext& aGc, const TRect& aRc) const;
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	//Set/reset opaque flag of aGc graphics context
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	void SetOpaque(CGraphicsContext& aGc) const;
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	void ResetOpaque(CGraphicsContext& aGc) const;
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	// flags
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	enum
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		{
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		EWrap = 1,
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		ETruncateWithEllipsis = 2,
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		EUseLabelsDevice = 4
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		};
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   113
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	MLayDoc* iLayDoc;
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	TUint iFlags;								// wrap, truncate, etc.
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	TInt iWidth;								// wrapping width
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	TChar iEllipsis;							// ellipsis character (or none if 0xFFFF) used if truncating
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	TInt iLabelsWidth;
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	TInt iLabelsGutter;
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	CLayoutData::TFormatMode iFormatMode;
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	MGraphicsDeviceMap* iImageDevice;			// device map used for drawing text
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	MGraphicsDeviceMap* iLabelsDevice;			// device map used for labels
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	MGraphicsDeviceMap* iFormatDevice;			// device map used for formatting
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	TInt iFontHeightIncreaseFactor;				// percentage automatically added to font heights
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	TInt iMinimumLineDescent;					// minimum line descent in pixels
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	TNonPrintingCharVisibility iNonPrintingCharVisibility;
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	const MFormParam* iFormParam;				// if non-null, points to the object that supplies system colours
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	const MFormCustomDraw* iCustomDraw;			// if non-null, points to custom drawing routines
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	const MFormCustomWrap* iCustomWrap;			// if non-null, points to custom wrapping routines 
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    /** Optional object able to provide a concrete customisation object for use 
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	    internally by Form. */
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	MFormCustomInterfaceProvider* iInterfaceProvider;
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	TBool iDrawOpaque;						// Opaque drawing active if the flag is ETrue
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	TInt iExcessHeightRequired;				// delta required to position the baseline so there is enough
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											// space for the highset glyph in pixels.  
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	MFormCustomInvisibleCharacterRemapper* iInvisibleCharacterRemapper;	// Used to customize the remapping of 
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																		// invisible characters to visible characters
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	};
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#endif